genshi/mirror: genshi/path.py annotate

annotate genshi/path.py @ 638:1f73e534e715 trunk

Fix for descendant-or-self XPath patterns when namespaces are involved.

author	cmlenz
date	Mon, 17 Sep 2007 21:51:21 +0000
parents	d0345c64da65
children	3d7288f373bd 4bc6741b2811

rev	line source
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	1 # -- coding: utf-8 --
5479aae32f5a Initial import. cmlenz parents: diff changeset	2 #
66 59eb24184e9c Switch copyright to Edgewall and URLs to markup.edgewall.org. cmlenz parents: 61 diff changeset	3 # Copyright (C) 2006 Edgewall Software
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	4 # All rights reserved.
5479aae32f5a Initial import. cmlenz parents: diff changeset	5 #
5479aae32f5a Initial import. cmlenz parents: diff changeset	6 # This software is licensed as described in the file COPYING, which
5479aae32f5a Initial import. cmlenz parents: diff changeset	7 # you should have received as part of this distribution. The terms
230 84168828b074 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	8 # are also available at http://genshi.edgewall.org/wiki/License.
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	9 #
5479aae32f5a Initial import. cmlenz parents: diff changeset	10 # This software consists of voluntary contributions made by many
5479aae32f5a Initial import. cmlenz parents: diff changeset	11 # individuals. For the exact contribution history, see the revision
230 84168828b074 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	12 # history and logs, available at http://genshi.edgewall.org/log/.
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	13
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	14 """Basic support for evaluating XPath expressions against streams.
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	15
230 84168828b074 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	16 >>> from genshi.input import XML
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	17 >>> doc = XML('''<doc>
516 317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	18 ... <items count="4">
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	19 ... <item status="new">
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	20 ... <summary>Foo</summary>
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	21 ... </item>
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	22 ... <item status="closed">
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	23 ... <summary>Bar</summary>
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	24 ... </item>
516 317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	25 ... <item status="closed" resolution="invalid">
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	26 ... <summary>Baz</summary>
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	27 ... </item>
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	28 ... <item status="closed" resolution="fixed">
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	29 ... <summary>Waz</summary>
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	30 ... </item>
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	31 ... </items>
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	32 ... </doc>''')
516 317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	33 >>> print doc.select('items/item[@status="closed" and '
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	34 ... '(@resolution="invalid" or not(@resolution))]/summary/text()')
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	35 BarBaz
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	36
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	37 Because the XPath engine operates on markup streams (as opposed to tree
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	38 structures), it only implements a subset of the full XPath 1.0 language.
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	39 """
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	40
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	41 from math import ceil, floor
593 0af1b7982ba5 Minor, cosmetic tweaks. cmlenz parents: 534 diff changeset	42 import operator
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	43 import re
5479aae32f5a Initial import. cmlenz parents: diff changeset	44
230 84168828b074 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	45 from genshi.core import Stream, Attrs, Namespace, QName
638 1f73e534e715 Fix for descendant-or-self XPath patterns when namespaces are involved. cmlenz parents: 605 diff changeset	46 from genshi.core import START, END, TEXT, START_NS, END_NS, COMMENT, PI, \
1f73e534e715 Fix for descendant-or-self XPath patterns when namespaces are involved. cmlenz parents: 605 diff changeset	47 START_CDATA, END_CDATA
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	48
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	49 __all__ = ['Path', 'PathSyntaxError']
425 073640758a42 Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	50 __docformat__ = 'restructuredtext en'
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	51
5479aae32f5a Initial import. cmlenz parents: diff changeset	52
114 4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	53 class Axis(object):
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	54 """Defines constants for the various supported XPath axes."""
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	55
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	56 ATTRIBUTE = 'attribute'
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	57 CHILD = 'child'
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	58 DESCENDANT = 'descendant'
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	59 DESCENDANT_OR_SELF = 'descendant-or-self'
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	60 SELF = 'self'
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	61
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	62 def forname(cls, name):
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	63 """Return the axis constant for the given name, or `None` if no such
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	64 axis was defined.
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	65 """
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	66 return getattr(cls, name.upper().replace('-', '_'), None)
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	67 forname = classmethod(forname)
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	68
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	69
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	70 ATTRIBUTE = Axis.ATTRIBUTE
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	71 CHILD = Axis.CHILD
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	72 DESCENDANT = Axis.DESCENDANT
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	73 DESCENDANT_OR_SELF = Axis.DESCENDANT_OR_SELF
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	74 SELF = Axis.SELF
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	75
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	76
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	77 class Path(object):
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	78 """Implements basic XPath support on streams.
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	79
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	80 Instances of this class represent a "compiled" XPath expression, and provide
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	81 methods for testing the path against a stream, as well as extracting a
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	82 substream matching that path.
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	83 """
5479aae32f5a Initial import. cmlenz parents: diff changeset	84
139 8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	85 def __init__(self, text, filename=None, lineno=-1):
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	86 """Create the path object from a string.
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	87
425 073640758a42 Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	88 :param text: the path expression
498 700e7b47bf2b A couple of minor doc refinements. cmlenz parents: 425 diff changeset	89 :param filename: the name of the file in which the path expression was
700e7b47bf2b A couple of minor doc refinements. cmlenz parents: 425 diff changeset	90 found (used in error messages)
700e7b47bf2b A couple of minor doc refinements. cmlenz parents: 425 diff changeset	91 :param lineno: the line on which the expression was found
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	92 """
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	93 self.source = text
139 8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	94 self.paths = PathParser(text, filename, lineno).parse()
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	95
5479aae32f5a Initial import. cmlenz parents: diff changeset	96 def __repr__(self):
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	97 paths = []
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	98 for path in self.paths:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	99 steps = []
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	100 for axis, nodetest, predicates in path:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	101 steps.append('%s::%s' % (axis, nodetest))
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	102 for predicate in predicates:
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	103 steps[-1] += '[%s]' % predicate
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	104 paths.append('/'.join(steps))
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	105 return '<%s "%s">' % (self.__class__.__name__, '\|'.join(paths))
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	106
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	107 def select(self, stream, namespaces=None, variables=None):
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	108 """Returns a substream of the given stream that matches the path.
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	109
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	110 If there are no matches, this method returns an empty stream.
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	111
230 84168828b074 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	112 >>> from genshi.input import XML
33 1fdb7054fb42 Add doctests for path module. cmlenz parents: 27 diff changeset	113 >>> xml = XML('<root><elem><child>Text</child></elem></root>')
61 448792ab1303 Use a different namespace than Kid uses. cmlenz parents: 38 diff changeset	114
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	115 >>> print Path('.//child').select(xml)
33 1fdb7054fb42 Add doctests for path module. cmlenz parents: 27 diff changeset	116 <child>Text</child>
1fdb7054fb42 Add doctests for path module. cmlenz parents: 27 diff changeset	117
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	118 >>> print Path('.//child/text()').select(xml)
33 1fdb7054fb42 Add doctests for path module. cmlenz parents: 27 diff changeset	119 Text
1fdb7054fb42 Add doctests for path module. cmlenz parents: 27 diff changeset	120
425 073640758a42 Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	121 :param stream: the stream to select from
073640758a42 Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	122 :param namespaces: (optional) a mapping of namespace prefixes to URIs
073640758a42 Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	123 :param variables: (optional) a mapping of variable names to values
073640758a42 Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	124 :return: the substream matching the path, or an empty stream
498 700e7b47bf2b A couple of minor doc refinements. cmlenz parents: 425 diff changeset	125 :rtype: `Stream`
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	126 """
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	127 if namespaces is None:
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	128 namespaces = {}
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	129 if variables is None:
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	130 variables = {}
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	131 stream = iter(stream)
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	132 def _generate():
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	133 test = self.test()
305 60111a041e7c Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	134 for event in stream:
60111a041e7c Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	135 result = test(event, namespaces, variables)
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	136 if result is True:
305 60111a041e7c Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	137 yield event
330 3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	138 if event[0] is START:
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	139 depth = 1
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	140 while depth > 0:
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	141 subevent = stream.next()
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	142 if subevent[0] is START:
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	143 depth += 1
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	144 elif subevent[0] is END:
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	145 depth -= 1
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	146 yield subevent
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	147 test(subevent, namespaces, variables,
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	148 updateonly=True)
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	149 elif result:
5479aae32f5a Initial import. cmlenz parents: diff changeset	150 yield result
605 d0345c64da65 Text templates now default to rendering as plain text; it is no longer necessary to explicitly specify the "text" method to the `render()` or `serialize()` method of the generated markup stream. See tickets #62 and #118. cmlenz parents: 593 diff changeset	151 return Stream(_generate(),
d0345c64da65 Text templates now default to rendering as plain text; it is no longer necessary to explicitly specify the "text" method to the `render()` or `serialize()` method of the generated markup stream. See tickets #62 and #118. cmlenz parents: 593 diff changeset	152 serializer=getattr(stream, 'serializer', None))
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	153
38 ee669cb9cccc Fix for #2 (incorrect context node in path expressions). Still some paths that produce incorrect results, but the common case seems to work now. cmlenz parents: 37 diff changeset	154 def test(self, ignore_context=False):
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	155 """Returns a function that can be used to track whether the path matches
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	156 a specific stream event.
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	157
425 073640758a42 Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	158 The function returned expects the positional arguments ``event``,
073640758a42 Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	159 ``namespaces`` and ``variables``. The first is a stream event, while the
305 60111a041e7c Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	160 latter two are a mapping of namespace prefixes to URIs, and a mapping
306 095a754f95a8 Minor optimization for XPath evaluation. cmlenz parents: 305 diff changeset	161 of variable names to values, respectively. In addition, the function
425 073640758a42 Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	162 accepts an ``updateonly`` keyword argument that default to ``False``. If
073640758a42 Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	163 it is set to ``True``, the function only updates its internal state,
306 095a754f95a8 Minor optimization for XPath evaluation. cmlenz parents: 305 diff changeset	164 but does not perform any tests or return a result.
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	165
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	166 If the path matches the event, the function returns the match (for
425 073640758a42 Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	167 example, a `START` or `TEXT` event.) Otherwise, it returns ``None``.
33 1fdb7054fb42 Add doctests for path module. cmlenz parents: 27 diff changeset	168
230 84168828b074 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	169 >>> from genshi.input import XML
33 1fdb7054fb42 Add doctests for path module. cmlenz parents: 27 diff changeset	170 >>> xml = XML('<root><elem><child id="1"/></elem><child id="2"/></root>')
1fdb7054fb42 Add doctests for path module. cmlenz parents: 27 diff changeset	171 >>> test = Path('child').test()
305 60111a041e7c Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	172 >>> for event in xml:
60111a041e7c Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	173 ... if test(event, {}, {}):
386 c66370dfc41b Unit test fixes for Python 2.3. cmlenz parents: 384 diff changeset	174 ... print event[0], repr(event[1])
c66370dfc41b Unit test fixes for Python 2.3. cmlenz parents: 384 diff changeset	175 START (QName(u'child'), Attrs([(QName(u'id'), u'2')]))
498 700e7b47bf2b A couple of minor doc refinements. cmlenz parents: 425 diff changeset	176
700e7b47bf2b A couple of minor doc refinements. cmlenz parents: 425 diff changeset	177 :param ignore_context: if `True`, the path is interpreted like a pattern
700e7b47bf2b A couple of minor doc refinements. cmlenz parents: 425 diff changeset	178 in XSLT, meaning for example that it will match
700e7b47bf2b A couple of minor doc refinements. cmlenz parents: 425 diff changeset	179 at any depth
700e7b47bf2b A couple of minor doc refinements. cmlenz parents: 425 diff changeset	180 :return: a function that can be used to test individual events in a
700e7b47bf2b A couple of minor doc refinements. cmlenz parents: 425 diff changeset	181 stream against the path
700e7b47bf2b A couple of minor doc refinements. cmlenz parents: 425 diff changeset	182 :rtype: ``function``
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	183 """
333 e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	184 paths = [(p, len(p), [0], [], [0] * len(p)) for p in [
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	185 (ignore_context and [_DOTSLASHSLASH] or []) + p for p in self.paths
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	186 ]]
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	187
306 095a754f95a8 Minor optimization for XPath evaluation. cmlenz parents: 305 diff changeset	188 def _test(event, namespaces, variables, updateonly=False):
330 3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	189 kind, data, pos = event[:3]
259 fe8dbe9066c1 Fix bug in evaluating XPath expressions using the union operator `\|`, which caused any path but the first to get out of sync with the event stream, and the whole thing returning too few results. cmlenz parents: 250 diff changeset	190 retval = None
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	191 for steps, size, cursors, cutoff, counter in paths:
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	192 # Manage the stack that tells us "where we are" in the stream
211 e5151983df0d Fix another regression introduced in [258]: some kinds of cascaded match templates were broken, for example in the TurboGears example app. cmlenz parents: 179 diff changeset	193 if kind is END:
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	194 if cursors:
a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	195 cursors.pop()
211 e5151983df0d Fix another regression introduced in [258]: some kinds of cascaded match templates were broken, for example in the TurboGears example app. cmlenz parents: 179 diff changeset	196 continue
223 9c199fcb9f31 Fix typo introduced in [272]. cmlenz parents: 217 diff changeset	197 elif kind is START:
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	198 cursors.append(cursors and cursors[-1] or 0)
638 1f73e534e715 Fix for descendant-or-self XPath patterns when namespaces are involved. cmlenz parents: 605 diff changeset	199 elif kind is START_NS or kind is END_NS \
1f73e534e715 Fix for descendant-or-self XPath patterns when namespaces are involved. cmlenz parents: 605 diff changeset	200 or kind is START_CDATA or kind is END_CDATA:
1f73e534e715 Fix for descendant-or-self XPath patterns when namespaces are involved. cmlenz parents: 605 diff changeset	201 continue
259 fe8dbe9066c1 Fix bug in evaluating XPath expressions using the union operator `\|`, which caused any path but the first to get out of sync with the event stream, and the whole thing returning too few results. cmlenz parents: 250 diff changeset	202
306 095a754f95a8 Minor optimization for XPath evaluation. cmlenz parents: 305 diff changeset	203 if updateonly or retval or not cursors:
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	204 continue
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	205 cursor = cursors[-1]
a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	206 depth = len(cursors)
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	207
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	208 if cutoff and depth + int(kind is not START) > cutoff[0]:
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	209 continue
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	210
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	211 ctxtnode = not ignore_context and kind is START \
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	212 and depth == 2
259 fe8dbe9066c1 Fix bug in evaluating XPath expressions using the union operator `\|`, which caused any path but the first to get out of sync with the event stream, and the whole thing returning too few results. cmlenz parents: 250 diff changeset	213 matched = None
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	214 while 1:
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	215 # Fetch the next location step
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	216 axis, nodetest, predicates = steps[cursor]
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	217
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	218 # If this is the start event for the context node, and the
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	219 # axis of the location step doesn't include the current
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	220 # element, skip the test
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	221 if ctxtnode and (axis is CHILD or axis is DESCENDANT):
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	222 break
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	223
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	224 # Is this the last step of the location path?
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	225 last_step = cursor + 1 == size
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	226
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	227 # Perform the actual node test
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	228 matched = nodetest(kind, data, pos, namespaces, variables)
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	229
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	230 # The node test matched
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	231 if matched:
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	232
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	233 # Check all the predicates for this step
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	234 if predicates:
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	235 for predicate in predicates:
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	236 pretval = predicate(kind, data, pos, namespaces,
a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	237 variables)
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	238 if type(pretval) is float: # FIXME <- need to
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	239 # check this for
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	240 # other types that
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	241 # can be coerced to
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	242 # float
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	243 counter[cursor] += 1
a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	244 if counter[cursor] != int(pretval):
a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	245 pretval = False
a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	246 if not pretval:
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	247 matched = None
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	248 break
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	249
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	250 # Both the node test and the predicates matched
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	251 if matched:
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	252 if last_step:
217 f150cff4da18 Fix `py:match` directive which would screw up in some scenarios due to incorrect handling of the substream. Closes #49. cmlenz parents: 216 diff changeset	253 if not ctxtnode or kind is not START \
f150cff4da18 Fix `py:match` directive which would screw up in some scenarios due to incorrect handling of the substream. Closes #49. cmlenz parents: 216 diff changeset	254 or axis is ATTRIBUTE or axis is SELF:
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	255 retval = matched
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	256 elif not ctxtnode or axis is SELF \
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	257 or axis is DESCENDANT_OR_SELF:
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	258 cursor += 1
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	259 cursors[-1] = cursor
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	260 cutoff[:] = []
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	261
333 e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	262 if kind is START:
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	263 if last_step and not (axis is DESCENDANT or
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	264 axis is DESCENDANT_OR_SELF):
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	265 cutoff[:] = [depth]
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	266
333 e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	267 elif steps[cursor][0] is ATTRIBUTE:
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	268 # If the axis of the next location step is the
363 37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead. cmlenz parents: 333 diff changeset	269 # attribute axis, we need to move on to processing
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead. cmlenz parents: 333 diff changeset	270 # that step without waiting for the next markup
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead. cmlenz parents: 333 diff changeset	271 # event
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	272 continue
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	273
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	274 # We're done with this step if it's the last step or the
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	275 # axis isn't "self"
384 5b6e4335ee21 Fix for infinite loop in XPath test. Closes #82. cmlenz parents: 364 diff changeset	276 if not matched or last_step or not (
5b6e4335ee21 Fix for infinite loop in XPath test. Closes #82. cmlenz parents: 364 diff changeset	277 axis is SELF or axis is DESCENDANT_OR_SELF):
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	278 break
638 1f73e534e715 Fix for descendant-or-self XPath patterns when namespaces are involved. cmlenz parents: 605 diff changeset	279 if ctxtnode and axis is DESCENDANT_OR_SELF:
1f73e534e715 Fix for descendant-or-self XPath patterns when namespaces are involved. cmlenz parents: 605 diff changeset	280 ctxtnode = False
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	281
333 e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	282 if (retval or not matched) and kind is START and \
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	283 not (axis is DESCENDANT or axis is DESCENDANT_OR_SELF):
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	284 # If this step is not a closure, it cannot be matched until
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	285 # the current element is closed... so we need to move the
114 4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	286 # cursor back to the previous closure and retest that
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	287 # against the current element
333 e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	288 backsteps = [(i, k, d, p) for i, (k, d, p)
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	289 in enumerate(steps[:cursor])
215 94120e6b0ce4 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	290 if k is DESCENDANT or k is DESCENDANT_OR_SELF]
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	291 backsteps.reverse()
333 e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	292 for cursor, axis, nodetest, predicates in backsteps:
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	293 if nodetest(kind, data, pos, namespaces, variables):
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	294 cutoff[:] = []
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	295 break
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	296 cursors[-1] = cursor
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	297
259 fe8dbe9066c1 Fix bug in evaluating XPath expressions using the union operator `\|`, which caused any path but the first to get out of sync with the event stream, and the whole thing returning too few results. cmlenz parents: 250 diff changeset	298 return retval
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	299
5479aae32f5a Initial import. cmlenz parents: diff changeset	300 return _test
5479aae32f5a Initial import. cmlenz parents: diff changeset	301
5479aae32f5a Initial import. cmlenz parents: diff changeset	302
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	303 class PathSyntaxError(Exception):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	304 """Exception raised when an XPath expression is syntactically incorrect."""
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	305
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	306 def __init__(self, message, filename=None, lineno=-1, offset=-1):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	307 if filename:
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	308 message = '%s (%s, line %d)' % (message, filename, lineno)
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	309 Exception.__init__(self, message)
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	310 self.filename = filename
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	311 self.lineno = lineno
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	312 self.offset = offset
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	313
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	314
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	315 class PathParser(object):
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	316 """Tokenizes and parses an XPath expression."""
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	317
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	318 _QUOTES = (("'", "'"), ('"', '"'))
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	319 _TOKENS = ('::', ':', '..', '.', '//', '/', '[', ']', '()', '(', ')', '@',
179 13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	320 '=', '!=', '!', '\|', ',', '>=', '>', '<=', '<', '$')
163 9c023c395e44 Support for XPath number literals including decimal places. cmlenz parents: 162 diff changeset	321 _tokenize = re.compile('("[^"]")\|(\'[^\']\')\|((?:\d+)?\.\d+)\|(%s)\|([^%s\s]+)\|\s+' % (
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	322 '\|'.join([re.escape(t) for t in _TOKENS]),
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	323 ''.join([re.escape(t[0]) for t in _TOKENS]))).findall
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	324
139 8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	325 def __init__(self, text, filename=None, lineno=-1):
8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	326 self.filename = filename
8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	327 self.lineno = lineno
163 9c023c395e44 Support for XPath number literals including decimal places. cmlenz parents: 162 diff changeset	328 self.tokens = filter(None, [dqstr or sqstr or number or token or name
9c023c395e44 Support for XPath number literals including decimal places. cmlenz parents: 162 diff changeset	329 for dqstr, sqstr, number, token, name in
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	330 self._tokenize(text)])
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	331 self.pos = 0
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	332
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	333 # Tokenizer
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	334
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	335 at_end = property(lambda self: self.pos == len(self.tokens) - 1)
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	336 cur_token = property(lambda self: self.tokens[self.pos])
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	337
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	338 def next_token(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	339 self.pos += 1
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	340 return self.tokens[self.pos]
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	341
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	342 def peek_token(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	343 if not self.at_end:
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	344 return self.tokens[self.pos + 1]
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	345 return None
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	346
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	347 # Recursive descent parser
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	348
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	349 def parse(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	350 """Parses the XPath expression and returns a list of location path
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	351 tests.
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	352
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	353 For union expressions (such as `*\|text()`), this function returns one
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	354 test for each operand in the union. For patch expressions that don't
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	355 use the union operator, the function always returns a list of size 1.
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	356
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	357 Each path test in turn is a sequence of tests that correspond to the
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	358 location steps, each tuples of the form `(axis, testfunc, predicates)`
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	359 """
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	360 paths = [self._location_path()]
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	361 while self.cur_token == '\|':
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	362 self.next_token()
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	363 paths.append(self._location_path())
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	364 if not self.at_end:
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	365 raise PathSyntaxError('Unexpected token %r after end of expression'
139 8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	366 % self.cur_token, self.filename, self.lineno)
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	367 return paths
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	368
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	369 def _location_path(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	370 steps = []
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	371 while True:
215 94120e6b0ce4 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	372 if self.cur_token.startswith('/'):
94120e6b0ce4 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	373 if self.cur_token == '//':
94120e6b0ce4 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	374 steps.append((DESCENDANT_OR_SELF, NodeTest(), []))
94120e6b0ce4 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	375 elif not steps:
94120e6b0ce4 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	376 raise PathSyntaxError('Absolute location paths not '
94120e6b0ce4 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	377 'supported', self.filename,
94120e6b0ce4 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	378 self.lineno)
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	379 self.next_token()
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	380
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	381 axis, nodetest, predicates = self._location_step()
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	382 if not axis:
145 47bbd9d2a5af * Fix error in expression evaluation when the expression evaluates to an iterable that does not produce event tuples. cmlenz parents: 139 diff changeset	383 axis = CHILD
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	384 steps.append((axis, nodetest, predicates))
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	385
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	386 if self.at_end or not self.cur_token.startswith('/'):
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	387 break
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	388
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	389 return steps
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	390
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	391 def _location_step(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	392 if self.cur_token == '@':
114 4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	393 axis = ATTRIBUTE
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	394 self.next_token()
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	395 elif self.cur_token == '.':
114 4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	396 axis = SELF
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	397 elif self.cur_token == '..':
139 8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	398 raise PathSyntaxError('Unsupported axis "parent"', self.filename,
8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	399 self.lineno)
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	400 elif self.peek_token() == '::':
114 4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	401 axis = Axis.forname(self.cur_token)
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	402 if axis is None:
139 8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	403 raise PathSyntaxError('Unsupport axis "%s"' % axis,
8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	404 self.filename, self.lineno)
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	405 self.next_token()
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	406 self.next_token()
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	407 else:
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	408 axis = None
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	409 nodetest = self._node_test(axis or CHILD)
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	410 predicates = []
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	411 while self.cur_token == '[':
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	412 predicates.append(self._predicate())
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	413 return axis, nodetest, predicates
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	414
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	415 def _node_test(self, axis=None):
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	416 test = prefix = None
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	417 next_token = self.peek_token()
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	418 if next_token in ('(', '()'): # Node type test
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	419 test = self._node_type()
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	420
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	421 elif next_token == ':': # Namespace prefix
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	422 prefix = self.cur_token
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	423 self.next_token()
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	424 localname = self.next_token()
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	425 if localname == '*':
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	426 test = QualifiedPrincipalTypeTest(axis, prefix)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	427 else:
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	428 test = QualifiedNameTest(axis, prefix, localname)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	429
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	430 else: # Name test
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	431 if self.cur_token == '*':
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	432 test = PrincipalTypeTest(axis)
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	433 elif self.cur_token == '.':
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	434 test = NodeTest()
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	435 else:
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	436 test = LocalNameTest(axis, self.cur_token)
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	437
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	438 if not self.at_end:
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	439 self.next_token()
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	440 return test
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	441
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	442 def _node_type(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	443 name = self.cur_token
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	444 self.next_token()
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	445
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	446 args = []
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	447 if self.cur_token != '()':
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	448 # The processing-instruction() function optionally accepts the
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	449 # name of the PI as argument, which must be a literal string
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	450 self.next_token() # (
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	451 if self.cur_token != ')':
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	452 string = self.cur_token
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	453 if (string[0], string[-1]) in self._QUOTES:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	454 string = string[1:-1]
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	455 args.append(string)
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	456
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	457 cls = _nodetest_map.get(name)
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	458 if not cls:
139 8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	459 raise PathSyntaxError('%s() not allowed here' % name, self.filename,
8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	460 self.lineno)
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	461 return cls(*args)
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	462
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	463 def _predicate(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	464 assert self.cur_token == '['
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	465 self.next_token()
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	466 expr = self._or_expr()
121 062e51ad7b19 Added support for the XPath functions `name()`, `namespace-uri()`, `local-name()`, and `not()`. cmlenz parents: 114 diff changeset	467 if self.cur_token != ']':
062e51ad7b19 Added support for the XPath functions `name()`, `namespace-uri()`, `local-name()`, and `not()`. cmlenz parents: 114 diff changeset	468 raise PathSyntaxError('Expected "]" to close predicate, '
139 8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	469 'but found "%s"' % self.cur_token,
8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	470 self.filename, self.lineno)
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	471 if not self.at_end:
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	472 self.next_token()
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	473 return expr
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	474
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	475 def _or_expr(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	476 expr = self._and_expr()
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	477 while self.cur_token == 'or':
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	478 self.next_token()
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	479 expr = OrOperator(expr, self._and_expr())
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	480 return expr
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	481
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	482 def _and_expr(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	483 expr = self._equality_expr()
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	484 while self.cur_token == 'and':
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	485 self.next_token()
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	486 expr = AndOperator(expr, self._equality_expr())
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	487 return expr
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	488
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	489 def _equality_expr(self):
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	490 expr = self._relational_expr()
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	491 while self.cur_token in ('=', '!='):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	492 op = _operator_map[self.cur_token]
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	493 self.next_token()
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	494 expr = op(expr, self._relational_expr())
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	495 return expr
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	496
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	497 def _relational_expr(self):
516 317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	498 expr = self._sub_expr()
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	499 while self.cur_token in ('>', '>=', '<', '>='):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	500 op = _operator_map[self.cur_token]
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	501 self.next_token()
516 317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	502 expr = op(expr, self._sub_expr())
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	503 return expr
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	504
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	505 def _sub_expr(self):
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	506 token = self.cur_token
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	507 if token != '(':
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	508 return self._primary_expr()
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	509 self.next_token()
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	510 expr = self._or_expr()
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	511 if self.cur_token != ')':
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	512 raise PathSyntaxError('Expected ")" to close sub-expression, '
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	513 'but found "%s"' % self.cur_token,
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	514 self.filename, self.lineno)
317a7f4e3c69 Implemented XPath sub-expressions. athomas parents: 498 diff changeset	515 self.next_token()
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	516 return expr
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	517
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	518 def _primary_expr(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	519 token = self.cur_token
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	520 if len(token) > 1 and (token[0], token[-1]) in self._QUOTES:
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	521 self.next_token()
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	522 return StringLiteral(token[1:-1])
163 9c023c395e44 Support for XPath number literals including decimal places. cmlenz parents: 162 diff changeset	523 elif token[0].isdigit() or token[0] == '.':
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	524 self.next_token()
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	525 return NumberLiteral(as_float(token))
179 13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	526 elif token == '$':
13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	527 token = self.next_token()
13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	528 self.next_token()
13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	529 return VariableReference(token)
121 062e51ad7b19 Added support for the XPath functions `name()`, `namespace-uri()`, `local-name()`, and `not()`. cmlenz parents: 114 diff changeset	530 elif not self.at_end and self.peek_token().startswith('('):
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	531 return self._function_call()
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	532 else:
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	533 axis = None
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	534 if token == '@':
114 4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	535 axis = ATTRIBUTE
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	536 self.next_token()
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	537 return self._node_test(axis)
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	538
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	539 def _function_call(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	540 name = self.cur_token
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	541 if self.next_token() == '()':
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	542 args = []
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	543 else:
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	544 assert self.cur_token == '('
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	545 self.next_token()
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	546 args = [self._or_expr()]
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	547 while self.cur_token == ',':
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	548 self.next_token()
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	549 args.append(self._or_expr())
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	550 if not self.cur_token == ')':
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	551 raise PathSyntaxError('Expected ")" to close function argument '
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	552 'list, but found "%s"' % self.cur_token,
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	553 self.filename, self.lineno)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	554 self.next_token()
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	555 cls = _function_map.get(name)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	556 if not cls:
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	557 raise PathSyntaxError('Unsupported function "%s"' % name,
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	558 self.filename, self.lineno)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	559 return cls(*args)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	560
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	561
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	562 # Type coercion
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	563
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	564 def as_scalar(value):
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	565 """Convert value to a scalar. If a single element Attrs() object is passed
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	566 the value of the single attribute will be returned."""
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	567 if isinstance(value, Attrs):
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	568 assert len(value) == 1
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	569 return value[0][1]
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	570 else:
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	571 return value
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	572
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	573 def as_float(value):
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	574 # FIXME - if value is a bool it will be coerced to 0.0 and consequently
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	575 # compared as a float. This is probably not ideal.
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	576 return float(as_scalar(value))
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	577
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	578 def as_long(value):
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	579 return long(as_scalar(value))
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	580
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	581 def as_string(value):
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	582 value = as_scalar(value)
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	583 if value is False:
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	584 return u''
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	585 return unicode(value)
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	586
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	587 def as_bool(value):
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	588 return bool(as_scalar(value))
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	589
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	590
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	591 # Node tests
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	592
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	593 class PrincipalTypeTest(object):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	594 """Node test that matches any event with the given principal type."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	595 __slots__ = ['principal_type']
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	596 def __init__(self, principal_type):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	597 self.principal_type = principal_type
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	598 def __call__(self, kind, data, pos, namespaces, variables):
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	599 if kind is START:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	600 if self.principal_type is ATTRIBUTE:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	601 return data[1] or None
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	602 else:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	603 return True
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	604 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	605 return '*'
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	606
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	607 class QualifiedPrincipalTypeTest(object):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	608 """Node test that matches any event with the given principal type in a
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	609 specific namespace."""
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	610 __slots__ = ['principal_type', 'prefix']
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	611 def __init__(self, principal_type, prefix):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	612 self.principal_type = principal_type
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	613 self.prefix = prefix
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	614 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	615 namespace = Namespace(namespaces.get(self.prefix))
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	616 if kind is START:
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	617 if self.principal_type is ATTRIBUTE and data[1]:
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	618 return Attrs([(name, value) for name, value in data[1]
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	619 if name in namespace]) or None
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	620 else:
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	621 return data[0] in namespace
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	622 def __repr__(self):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	623 return '%s:*' % self.prefix
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	624
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	625 class LocalNameTest(object):
364 7dabedbb53fb Fix for #77: match templates were matching their own output. cmlenz parents: 363 diff changeset	626 """Node test that matches any event with the given principal type and
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	627 local name.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	628 """
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	629 __slots__ = ['principal_type', 'name']
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	630 def __init__(self, principal_type, name):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	631 self.principal_type = principal_type
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	632 self.name = name
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	633 def __call__(self, kind, data, pos, namespaces, variables):
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	634 if kind is START:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	635 if self.principal_type is ATTRIBUTE and self.name in data[1]:
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	636 return Attrs([(self.name, data[1].get(self.name))])
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	637 else:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	638 return data[0].localname == self.name
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	639 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	640 return self.name
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	641
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	642 class QualifiedNameTest(object):
364 7dabedbb53fb Fix for #77: match templates were matching their own output. cmlenz parents: 363 diff changeset	643 """Node test that matches any event with the given principal type and
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	644 qualified name.
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	645 """
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	646 __slots__ = ['principal_type', 'prefix', 'name']
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	647 def __init__(self, principal_type, prefix, name):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	648 self.principal_type = principal_type
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	649 self.prefix = prefix
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	650 self.name = name
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	651 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	652 qname = QName('%s}%s' % (namespaces.get(self.prefix), self.name))
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	653 if kind is START:
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	654 if self.principal_type is ATTRIBUTE and qname in data[1]:
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	655 return Attrs([(self.name, data[1].get(self.name))])
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	656 else:
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	657 return data[0] == qname
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	658 def __repr__(self):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	659 return '%s:%s' % (self.prefix, self.name)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	660
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	661 class CommentNodeTest(object):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	662 """Node test that matches any comment events."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	663 __slots__ = []
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	664 def __call__(self, kind, data, pos, namespaces, variables):
330 3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	665 return kind is COMMENT
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	666 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	667 return 'comment()'
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	668
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	669 class NodeTest(object):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	670 """Node test that matches any node."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	671 __slots__ = []
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	672 def __call__(self, kind, data, pos, namespaces, variables):
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	673 if kind is START:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	674 return True
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	675 return kind, data, pos
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	676 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	677 return 'node()'
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	678
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	679 class ProcessingInstructionNodeTest(object):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	680 """Node test that matches any processing instruction event."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	681 __slots__ = ['target']
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	682 def __init__(self, target=None):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	683 self.target = target
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	684 def __call__(self, kind, data, pos, namespaces, variables):
330 3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	685 return kind is PI and (not self.target or data[0] == self.target)
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	686 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	687 arg = ''
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	688 if self.target:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	689 arg = '"' + self.target + '"'
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	690 return 'processing-instruction(%s)' % arg
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	691
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	692 class TextNodeTest(object):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	693 """Node test that matches any text event."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	694 __slots__ = []
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	695 def __call__(self, kind, data, pos, namespaces, variables):
330 3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	696 return kind is TEXT
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	697 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	698 return 'text()'
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	699
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	700 _nodetest_map = {'comment': CommentNodeTest, 'node': NodeTest,
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	701 'processing-instruction': ProcessingInstructionNodeTest,
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	702 'text': TextNodeTest}
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	703
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	704 # Functions
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	705
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	706 class Function(object):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	707 """Base class for function nodes in XPath expressions."""
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	708
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	709 class BooleanFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	710 """The `boolean` function, which converts its argument to a boolean
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	711 value.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	712 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	713 __slots__ = ['expr']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	714 def __init__(self, expr):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	715 self.expr = expr
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	716 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	717 val = self.expr(kind, data, pos, namespaces, variables)
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	718 return as_bool(val)
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	719 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	720 return 'boolean(%r)' % self.expr
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	721
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	722 class CeilingFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	723 """The `ceiling` function, which returns the nearest lower integer number
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	724 for the given number.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	725 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	726 __slots__ = ['number']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	727 def __init__(self, number):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	728 self.number = number
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	729 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	730 number = self.number(kind, data, pos, namespaces, variables)
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	731 return ceil(as_float(number))
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	732 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	733 return 'ceiling(%r)' % self.number
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	734
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	735 class ConcatFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	736 """The `concat` function, which concatenates (joins) the variable number of
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	737 strings it gets as arguments.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	738 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	739 __slots__ = ['exprs']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	740 def __init__(self, *exprs):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	741 self.exprs = exprs
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	742 def __call__(self, kind, data, pos, namespaces, variables):
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	743 strings = []
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	744 for item in [expr(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	745 for expr in self.exprs]:
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	746 strings.append(as_string(item))
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	747 return u''.join(strings)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	748 def __repr__(self):
169 dc6676d3b697 Fix syntax error in `path` module. cmlenz parents: 164 diff changeset	749 return 'concat(%s)' % ', '.join([repr(expr) for expr in self.exprs])
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	750
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	751 class ContainsFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	752 """The `contains` function, which returns whether a string contains a given
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	753 substring.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	754 """
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	755 __slots__ = ['string1', 'string2']
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	756 def __init__(self, string1, string2):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	757 self.string1 = string1
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	758 self.string2 = string2
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	759 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	760 string1 = self.string1(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	761 string2 = self.string2(kind, data, pos, namespaces, variables)
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	762 return as_string(string2) in as_string(string1)
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	763 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	764 return 'contains(%r, %r)' % (self.string1, self.string2)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	765
534 57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	766 class MatchesFunction(Function):
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	767 """The `matches` function, which returns whether a string matches a regular
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	768 expression.
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	769 """
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	770 __slots__ = ['string1', 'string2']
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	771 flag_mapping = {'s': re.S, 'm': re.M, 'i': re.I, 'x': re.X}
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	772
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	773 def __init__(self, string1, string2, flags=''):
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	774 self.string1 = string1
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	775 self.string2 = string2
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	776 self.flags = self._map_flags(flags)
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	777 def __call__(self, kind, data, pos, namespaces, variables):
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	778 string1 = as_string(self.string1(kind, data, pos, namespaces, variables))
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	779 string2 = as_string(self.string2(kind, data, pos, namespaces, variables))
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	780 return re.search(string2, string1, self.flags)
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	781 def _map_flags(self, flags):
593 0af1b7982ba5 Minor, cosmetic tweaks. cmlenz parents: 534 diff changeset	782 return reduce(operator.or_,
534 57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	783 [self.flag_map[flag] for flag in flags], re.U)
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	784 def __repr__(self):
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	785 return 'contains(%r, %r)' % (self.string1, self.string2)
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	786
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	787 class FalseFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	788 """The `false` function, which always returns the boolean `false` value."""
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	789 __slots__ = []
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	790 def __call__(self, kind, data, pos, namespaces, variables):
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	791 return False
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	792 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	793 return 'false()'
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	794
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	795 class FloorFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	796 """The `ceiling` function, which returns the nearest higher integer number
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	797 for the given number.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	798 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	799 __slots__ = ['number']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	800 def __init__(self, number):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	801 self.number = number
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	802 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	803 number = self.number(kind, data, pos, namespaces, variables)
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	804 return floor(as_float(number))
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	805 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	806 return 'floor(%r)' % self.number
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	807
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	808 class LocalNameFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	809 """The `local-name` function, which returns the local name of the current
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	810 element.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	811 """
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	812 __slots__ = []
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	813 def __call__(self, kind, data, pos, namespaces, variables):
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	814 if kind is START:
234 39c424b80edd * Minor simplification of XPath engine. cmlenz parents: 230 diff changeset	815 return data[0].localname
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	816 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	817 return 'local-name()'
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	818
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	819 class NameFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	820 """The `name` function, which returns the qualified name of the current
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	821 element.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	822 """
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	823 __slots__ = []
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	824 def __call__(self, kind, data, pos, namespaces, variables):
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	825 if kind is START:
234 39c424b80edd * Minor simplification of XPath engine. cmlenz parents: 230 diff changeset	826 return data[0]
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	827 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	828 return 'name()'
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	829
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	830 class NamespaceUriFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	831 """The `namespace-uri` function, which returns the namespace URI of the
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	832 current element.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	833 """
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	834 __slots__ = []
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	835 def __call__(self, kind, data, pos, namespaces, variables):
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	836 if kind is START:
234 39c424b80edd * Minor simplification of XPath engine. cmlenz parents: 230 diff changeset	837 return data[0].namespace
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	838 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	839 return 'namespace-uri()'
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	840
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	841 class NotFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	842 """The `not` function, which returns the negated boolean value of its
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	843 argument.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	844 """
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	845 __slots__ = ['expr']
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	846 def __init__(self, expr):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	847 self.expr = expr
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	848 def __call__(self, kind, data, pos, namespaces, variables):
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	849 return not as_bool(self.expr(kind, data, pos, namespaces, variables))
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	850 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	851 return 'not(%s)' % self.expr
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	852
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	853 class NormalizeSpaceFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	854 """The `normalize-space` function, which removes leading and trailing
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	855 whitespace in the given string, and replaces multiple adjacent whitespace
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	856 characters inside the string with a single space.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	857 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	858 __slots__ = ['expr']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	859 _normalize = re.compile(r'\s{2,}').sub
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	860 def __init__(self, expr):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	861 self.expr = expr
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	862 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	863 string = self.expr(kind, data, pos, namespaces, variables)
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	864 return self._normalize(' ', as_string(string).strip())
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	865 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	866 return 'normalize-space(%s)' % repr(self.expr)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	867
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	868 class NumberFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	869 """The `number` function that converts its argument to a number."""
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	870 __slots__ = ['expr']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	871 def __init__(self, expr):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	872 self.expr = expr
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	873 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	874 val = self.expr(kind, data, pos, namespaces, variables)
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	875 return as_float(val)
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	876 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	877 return 'number(%r)' % self.expr
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	878
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	879 class RoundFunction(Function):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	880 """The `round` function, which returns the nearest integer number for the
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	881 given number.
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	882 """
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	883 __slots__ = ['number']
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	884 def __init__(self, number):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	885 self.number = number
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	886 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	887 number = self.number(kind, data, pos, namespaces, variables)
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	888 return round(as_float(number))
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	889 def __repr__(self):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	890 return 'round(%r)' % self.number
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	891
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	892 class StartsWithFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	893 """The `starts-with` function that returns whether one string starts with
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	894 a given substring.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	895 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	896 __slots__ = ['string1', 'string2']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	897 def __init__(self, string1, string2):
282 24b3cbbc1b1b Fix `starts-with()` XPath function so that it actually compares the two strings. Closes #61. cmlenz parents: 259 diff changeset	898 self.string1 = string1
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	899 self.string2 = string2
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	900 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	901 string1 = self.string1(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	902 string2 = self.string2(kind, data, pos, namespaces, variables)
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	903 return as_string(string1).startswith(as_string(string2))
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	904 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	905 return 'starts-with(%r, %r)' % (self.string1, self.string2)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	906
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	907 class StringLengthFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	908 """The `string-length` function that returns the length of the given
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	909 string.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	910 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	911 __slots__ = ['expr']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	912 def __init__(self, expr):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	913 self.expr = expr
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	914 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	915 string = self.expr(kind, data, pos, namespaces, variables)
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	916 return len(as_string(string))
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	917 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	918 return 'string-length(%r)' % self.expr
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	919
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	920 class SubstringFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	921 """The `substring` function that returns the part of a string that starts
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	922 at the given offset, and optionally limited to the given length.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	923 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	924 __slots__ = ['string', 'start', 'length']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	925 def __init__(self, string, start, length=None):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	926 self.string = string
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	927 self.start = start
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	928 self.length = length
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	929 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	930 string = self.string(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	931 start = self.start(kind, data, pos, namespaces, variables)
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	932 length = 0
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	933 if self.length is not None:
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	934 length = self.length(kind, data, pos, namespaces, variables)
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	935 return string[as_long(start):len(as_string(string)) - as_long(length)]
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	936 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	937 if self.length is not None:
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	938 return 'substring(%r, %r, %r)' % (self.string, self.start,
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	939 self.length)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	940 else:
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	941 return 'substring(%r, %r)' % (self.string, self.start)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	942
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	943 class SubstringAfterFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	944 """The `substring-after` function that returns the part of a string that
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	945 is found after the given substring.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	946 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	947 __slots__ = ['string1', 'string2']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	948 def __init__(self, string1, string2):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	949 self.string1 = string1
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	950 self.string2 = string2
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	951 def __call__(self, kind, data, pos, namespaces, variables):
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	952 string1 = as_string(self.string1(kind, data, pos, namespaces, variables))
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	953 string2 = as_string(self.string2(kind, data, pos, namespaces, variables))
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	954 index = string1.find(string2)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	955 if index >= 0:
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	956 return string1[index + len(string2):]
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	957 return u''
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	958 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	959 return 'substring-after(%r, %r)' % (self.string1, self.string2)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	960
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	961 class SubstringBeforeFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	962 """The `substring-before` function that returns the part of a string that
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	963 is found before the given substring.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	964 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	965 __slots__ = ['string1', 'string2']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	966 def __init__(self, string1, string2):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	967 self.string1 = string1
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	968 self.string2 = string2
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	969 def __call__(self, kind, data, pos, namespaces, variables):
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	970 string1 = as_string(self.string1(kind, data, pos, namespaces, variables))
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	971 string2 = as_string(self.string2(kind, data, pos, namespaces, variables))
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	972 index = string1.find(string2)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	973 if index >= 0:
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	974 return string1[:index]
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	975 return u''
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	976 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	977 return 'substring-after(%r, %r)' % (self.string1, self.string2)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	978
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	979 class TranslateFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	980 """The `translate` function that translates a set of characters in a
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	981 string to target set of characters.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	982 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	983 __slots__ = ['string', 'fromchars', 'tochars']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	984 def __init__(self, string, fromchars, tochars):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	985 self.string = string
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	986 self.fromchars = fromchars
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	987 self.tochars = tochars
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	988 def __call__(self, kind, data, pos, namespaces, variables):
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	989 string = as_string(self.string(kind, data, pos, namespaces, variables))
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	990 fromchars = as_string(self.fromchars(kind, data, pos, namespaces, variables))
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	991 tochars = as_string(self.tochars(kind, data, pos, namespaces, variables))
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	992 table = dict(zip([ord(c) for c in fromchars],
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	993 [ord(c) for c in tochars]))
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	994 return string.translate(table)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	995 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	996 return 'translate(%r, %r, %r)' % (self.string, self.fromchars,
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	997 self.tochars)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	998
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	999 class TrueFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1000 """The `true` function, which always returns the boolean `true` value."""
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1001 __slots__ = []
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1002 def __call__(self, kind, data, pos, namespaces, variables):
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1003 return True
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1004 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1005 return 'true()'
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1006
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1007 _function_map = {'boolean': BooleanFunction, 'ceiling': CeilingFunction,
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1008 'concat': ConcatFunction, 'contains': ContainsFunction,
534 57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	1009 'matches': MatchesFunction, 'false': FalseFunction, 'floor':
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	1010 FloorFunction, 'local-name': LocalNameFunction, 'name':
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	1011 NameFunction, 'namespace-uri': NamespaceUriFunction,
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1012 'normalize-space': NormalizeSpaceFunction, 'not': NotFunction,
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1013 'number': NumberFunction, 'round': RoundFunction,
534 57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	1014 'starts-with': StartsWithFunction, 'string-length':
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	1015 StringLengthFunction, 'substring': SubstringFunction,
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	1016 'substring-after': SubstringAfterFunction, 'substring-before':
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	1017 SubstringBeforeFunction, 'translate': TranslateFunction,
57b5d5138f1a Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	1018 'true': TrueFunction}
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1019
179 13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	1020 # Literals & Variables
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1021
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1022 class Literal(object):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1023 """Abstract base class for literal nodes."""
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1024
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1025 class StringLiteral(Literal):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1026 """A string literal node."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1027 __slots__ = ['text']
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1028 def __init__(self, text):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1029 self.text = text
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1030 def __call__(self, kind, data, pos, namespaces, variables):
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	1031 return self.text
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1032 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1033 return '"%s"' % self.text
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1034
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1035 class NumberLiteral(Literal):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1036 """A number literal node."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1037 __slots__ = ['number']
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1038 def __init__(self, number):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1039 self.number = number
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1040 def __call__(self, kind, data, pos, namespaces, variables):
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	1041 return self.number
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1042 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1043 return str(self.number)
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1044
179 13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	1045 class VariableReference(Literal):
13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	1046 """A variable reference node."""
13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	1047 __slots__ = ['name']
13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	1048 def __init__(self, name):
13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	1049 self.name = name
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1050 def __call__(self, kind, data, pos, namespaces, variables):
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	1051 return variables.get(self.name)
179 13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	1052 def __repr__(self):
215 94120e6b0ce4 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	1053 return str(self.name)
179 13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	1054
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1055 # Operators
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1056
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1057 class AndOperator(object):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1058 """The boolean operator `and`."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1059 __slots__ = ['lval', 'rval']
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1060 def __init__(self, lval, rval):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1061 self.lval = lval
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1062 self.rval = rval
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1063 def __call__(self, kind, data, pos, namespaces, variables):
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1064 lval = as_bool(self.lval(kind, data, pos, namespaces, variables))
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1065 if not lval:
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1066 return False
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1067 rval = self.rval(kind, data, pos, namespaces, variables)
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1068 return as_bool(rval)
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1069 def __repr__(self):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1070 return '%s and %s' % (self.lval, self.rval)
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1071
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1072 class EqualsOperator(object):
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1073 """The equality operator `=`."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1074 __slots__ = ['lval', 'rval']
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1075 def __init__(self, lval, rval):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1076 self.lval = lval
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1077 self.rval = rval
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1078 def __call__(self, kind, data, pos, namespaces, variables):
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1079 lval = as_scalar(self.lval(kind, data, pos, namespaces, variables))
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1080 rval = as_scalar(self.rval(kind, data, pos, namespaces, variables))
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1081 return lval == rval
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1082 def __repr__(self):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1083 return '%s=%s' % (self.lval, self.rval)
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1084
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1085 class NotEqualsOperator(object):
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1086 """The equality operator `!=`."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1087 __slots__ = ['lval', 'rval']
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1088 def __init__(self, lval, rval):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1089 self.lval = lval
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1090 self.rval = rval
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1091 def __call__(self, kind, data, pos, namespaces, variables):
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1092 lval = as_scalar(self.lval(kind, data, pos, namespaces, variables))
c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1093 rval = as_scalar(self.rval(kind, data, pos, namespaces, variables))
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1094 return lval != rval
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1095 def __repr__(self):
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1096 return '%s!=%s' % (self.lval, self.rval)
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1097
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1098 class OrOperator(object):
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1099 """The boolean operator `or`."""
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1100 __slots__ = ['lval', 'rval']
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1101 def __init__(self, lval, rval):
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1102 self.lval = lval
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1103 self.rval = rval
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1104 def __call__(self, kind, data, pos, namespaces, variables):
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1105 lval = as_bool(self.lval(kind, data, pos, namespaces, variables))
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1106 if lval:
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1107 return True
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1108 rval = self.rval(kind, data, pos, namespaces, variables)
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1109 return as_bool(rval)
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1110 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1111 return '%s or %s' % (self.lval, self.rval)
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1112
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1113 class GreaterThanOperator(object):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1114 """The relational operator `>` (greater than)."""
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1115 __slots__ = ['lval', 'rval']
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1116 def __init__(self, lval, rval):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1117 self.lval = lval
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1118 self.rval = rval
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1119 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1120 lval = self.lval(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1121 rval = self.rval(kind, data, pos, namespaces, variables)
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1122 return as_float(lval) > as_float(rval)
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1123 def __repr__(self):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1124 return '%s>%s' % (self.lval, self.rval)
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1125
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1126 class GreaterThanOrEqualOperator(object):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1127 """The relational operator `>=` (greater than or equal)."""
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1128 __slots__ = ['lval', 'rval']
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1129 def __init__(self, lval, rval):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1130 self.lval = lval
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1131 self.rval = rval
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1132 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1133 lval = self.lval(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1134 rval = self.rval(kind, data, pos, namespaces, variables)
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1135 return as_float(lval) >= as_float(rval)
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1136 def __repr__(self):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1137 return '%s>=%s' % (self.lval, self.rval)
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1138
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1139 class LessThanOperator(object):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1140 """The relational operator `<` (less than)."""
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1141 __slots__ = ['lval', 'rval']
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1142 def __init__(self, lval, rval):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1143 self.lval = lval
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1144 self.rval = rval
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1145 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1146 lval = self.lval(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1147 rval = self.rval(kind, data, pos, namespaces, variables)
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1148 return as_float(lval) < as_float(rval)
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1149 def __repr__(self):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1150 return '%s<%s' % (self.lval, self.rval)
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1151
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1152 class LessThanOrEqualOperator(object):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1153 """The relational operator `<=` (less than or equal)."""
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1154 __slots__ = ['lval', 'rval']
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1155 def __init__(self, lval, rval):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1156 self.lval = lval
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1157 self.rval = rval
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1158 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1159 lval = self.lval(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1160 rval = self.rval(kind, data, pos, namespaces, variables)
518 c1f2a859fd75 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1161 return as_float(lval) <= as_float(rval)
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1162 def __repr__(self):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1163 return '%s<=%s' % (self.lval, self.rval)
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1164
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1165 _operator_map = {'=': EqualsOperator, '!=': NotEqualsOperator,
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1166 '>': GreaterThanOperator, '>=': GreaterThanOrEqualOperator,
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1167 '<': LessThanOperator, '>=': LessThanOrEqualOperator}
333 e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	1168
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	1169
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	1170 _DOTSLASHSLASH = (DESCENDANT_OR_SELF, PrincipalTypeTest(None), ())

Mercurial > genshi > mirror

annotate genshi/path.py @ 638:1f73e534e715 trunk