genshi/genshi-test: genshi/path.py annotate

annotate genshi/path.py @ 593:aa5762c7b7f1

Minor, cosmetic tweaks.

author	cmlenz
date	Mon, 13 Aug 2007 21:38:46 +0000
parents	cccb6c748609
children	bc5faca93699

rev	line source
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	1 # -- coding: utf-8 --
821114ec4f69 Initial import. cmlenz parents: diff changeset	2 #
66 822089ae65ce Switch copyright to Edgewall and URLs to markup.edgewall.org. cmlenz parents: 61 diff changeset	3 # Copyright (C) 2006 Edgewall Software
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	4 # All rights reserved.
821114ec4f69 Initial import. cmlenz parents: diff changeset	5 #
821114ec4f69 Initial import. cmlenz parents: diff changeset	6 # This software is licensed as described in the file COPYING, which
821114ec4f69 Initial import. cmlenz parents: diff changeset	7 # you should have received as part of this distribution. The terms
230 24757b771651 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	8 # are also available at http://genshi.edgewall.org/wiki/License.
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	9 #
821114ec4f69 Initial import. cmlenz parents: diff changeset	10 # This software consists of voluntary contributions made by many
821114ec4f69 Initial import. cmlenz parents: diff changeset	11 # individuals. For the exact contribution history, see the revision
230 24757b771651 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	12 # history and logs, available at http://genshi.edgewall.org/log/.
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	13
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	14 """Basic support for evaluating XPath expressions against streams.
8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	15
230 24757b771651 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	16 >>> from genshi.input import XML
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	17 >>> doc = XML('''<doc>
516 0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	18 ... <items count="4">
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	19 ... <item status="new">
8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	20 ... <summary>Foo</summary>
8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	21 ... </item>
8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	22 ... <item status="closed">
8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	23 ... <summary>Bar</summary>
8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	24 ... </item>
516 0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	25 ... <item status="closed" resolution="invalid">
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	26 ... <summary>Baz</summary>
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	27 ... </item>
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	28 ... <item status="closed" resolution="fixed">
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	29 ... <summary>Waz</summary>
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	30 ... </item>
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	31 ... </items>
8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	32 ... </doc>''')
516 0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	33 >>> print doc.select('items/item[@status="closed" and '
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	34 ... '(@resolution="invalid" or not(@resolution))]/summary/text()')
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	35 BarBaz
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	36
8a4d9064f363 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
8a4d9064f363 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.
8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	39 """
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	40
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	41 from math import ceil, floor
593 aa5762c7b7f1 Minor, cosmetic tweaks. cmlenz parents: 534 diff changeset	42 import operator
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	43 import re
821114ec4f69 Initial import. cmlenz parents: diff changeset	44
230 24757b771651 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	45 from genshi.core import Stream, Attrs, Namespace, QName
24757b771651 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	46 from genshi.core import START, END, TEXT, COMMENT, PI
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	47
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	48 __all__ = ['Path', 'PathSyntaxError']
425 5b248708bbed Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	49 __docformat__ = 'restructuredtext en'
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	50
821114ec4f69 Initial import. cmlenz parents: diff changeset	51
114 8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	52 class Axis(object):
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	53 """Defines constants for the various supported XPath axes."""
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	54
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	55 ATTRIBUTE = 'attribute'
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	56 CHILD = 'child'
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	57 DESCENDANT = 'descendant'
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	58 DESCENDANT_OR_SELF = 'descendant-or-self'
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	59 SELF = 'self'
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	60
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	61 def forname(cls, name):
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	62 """Return the axis constant for the given name, or `None` if no such
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	63 axis was defined.
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	64 """
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	65 return getattr(cls, name.upper().replace('-', '_'), None)
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	66 forname = classmethod(forname)
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	67
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	68
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	69 ATTRIBUTE = Axis.ATTRIBUTE
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	70 CHILD = Axis.CHILD
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	71 DESCENDANT = Axis.DESCENDANT
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	72 DESCENDANT_OR_SELF = Axis.DESCENDANT_OR_SELF
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	73 SELF = Axis.SELF
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	74
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	75
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	76 class Path(object):
26 039fc5b87405 * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	77 """Implements basic XPath support on streams.
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	78
26 039fc5b87405 * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	79 Instances of this class represent a "compiled" XPath expression, and provide
039fc5b87405 * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	80 methods for testing the path against a stream, as well as extracting a
039fc5b87405 * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	81 substream matching that path.
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	82 """
821114ec4f69 Initial import. cmlenz parents: diff changeset	83
139 54131cbb91a5 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	84 def __init__(self, text, filename=None, lineno=-1):
26 039fc5b87405 * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	85 """Create the path object from a string.
039fc5b87405 * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	86
425 5b248708bbed Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	87 :param text: the path expression
498 5b42b341185a A couple of minor doc refinements. cmlenz parents: 425 diff changeset	88 :param filename: the name of the file in which the path expression was
5b42b341185a A couple of minor doc refinements. cmlenz parents: 425 diff changeset	89 found (used in error messages)
5b42b341185a A couple of minor doc refinements. cmlenz parents: 425 diff changeset	90 :param lineno: the line on which the expression was found
26 039fc5b87405 * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	91 """
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	92 self.source = text
139 54131cbb91a5 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	93 self.paths = PathParser(text, filename, lineno).parse()
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	94
821114ec4f69 Initial import. cmlenz parents: diff changeset	95 def __repr__(self):
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	96 paths = []
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	97 for path in self.paths:
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	98 steps = []
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	99 for axis, nodetest, predicates in path:
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	100 steps.append('%s::%s' % (axis, nodetest))
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	101 for predicate in predicates:
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	102 steps[-1] += '[%s]' % predicate
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	103 paths.append('/'.join(steps))
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	104 return '<%s "%s">' % (self.__class__.__name__, '\|'.join(paths))
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	105
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	106 def select(self, stream, namespaces=None, variables=None):
26 039fc5b87405 * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	107 """Returns a substream of the given stream that matches the path.
039fc5b87405 * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	108
039fc5b87405 * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	109 If there are no matches, this method returns an empty stream.
039fc5b87405 * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	110
230 24757b771651 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	111 >>> from genshi.input import XML
33 0e1fc0211416 Add doctests for path module. cmlenz parents: 27 diff changeset	112 >>> xml = XML('<root><elem><child>Text</child></elem></root>')
61 33c2702cf6da Use a different namespace than Kid uses. cmlenz parents: 38 diff changeset	113
216 0a01371cecbc 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	114 >>> print Path('.//child').select(xml)
33 0e1fc0211416 Add doctests for path module. cmlenz parents: 27 diff changeset	115 <child>Text</child>
0e1fc0211416 Add doctests for path module. cmlenz parents: 27 diff changeset	116
216 0a01371cecbc 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	117 >>> print Path('.//child/text()').select(xml)
33 0e1fc0211416 Add doctests for path module. cmlenz parents: 27 diff changeset	118 Text
0e1fc0211416 Add doctests for path module. cmlenz parents: 27 diff changeset	119
425 5b248708bbed Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	120 :param stream: the stream to select from
5b248708bbed Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	121 :param namespaces: (optional) a mapping of namespace prefixes to URIs
5b248708bbed Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	122 :param variables: (optional) a mapping of variable names to values
5b248708bbed Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	123 :return: the substream matching the path, or an empty stream
498 5b42b341185a A couple of minor doc refinements. cmlenz parents: 425 diff changeset	124 :rtype: `Stream`
26 039fc5b87405 * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	125 """
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	126 if namespaces is None:
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	127 namespaces = {}
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	128 if variables is None:
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	129 variables = {}
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	130 stream = iter(stream)
26 039fc5b87405 * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	131 def _generate():
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	132 test = self.test()
305 6e6950ac0e56 Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	133 for event in stream:
6e6950ac0e56 Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	134 result = test(event, namespaces, variables)
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	135 if result is True:
305 6e6950ac0e56 Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	136 yield event
330 1dbeaef463e7 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	137 if event[0] is START:
1dbeaef463e7 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	138 depth = 1
1dbeaef463e7 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	139 while depth > 0:
1dbeaef463e7 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	140 subevent = stream.next()
1dbeaef463e7 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	141 if subevent[0] is START:
1dbeaef463e7 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	142 depth += 1
1dbeaef463e7 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	143 elif subevent[0] is END:
1dbeaef463e7 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	144 depth -= 1
1dbeaef463e7 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	145 yield subevent
1dbeaef463e7 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	146 test(subevent, namespaces, variables,
1dbeaef463e7 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	147 updateonly=True)
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	148 elif result:
821114ec4f69 Initial import. cmlenz parents: diff changeset	149 yield result
26 039fc5b87405 * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	150 return Stream(_generate())
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	151
38 fec9f4897415 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	152 def test(self, ignore_context=False):
26 039fc5b87405 * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	153 """Returns a function that can be used to track whether the path matches
039fc5b87405 * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	154 a specific stream event.
039fc5b87405 * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	155
425 5b248708bbed Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	156 The function returned expects the positional arguments ``event``,
5b248708bbed Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	157 ``namespaces`` and ``variables``. The first is a stream event, while the
305 6e6950ac0e56 Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	158 latter two are a mapping of namespace prefixes to URIs, and a mapping
306 3425c26d2c09 Minor optimization for XPath evaluation. cmlenz parents: 305 diff changeset	159 of variable names to values, respectively. In addition, the function
425 5b248708bbed Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	160 accepts an ``updateonly`` keyword argument that default to ``False``. If
5b248708bbed Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	161 it is set to ``True``, the function only updates its internal state,
306 3425c26d2c09 Minor optimization for XPath evaluation. cmlenz parents: 305 diff changeset	162 but does not perform any tests or return a result.
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	163
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	164 If the path matches the event, the function returns the match (for
425 5b248708bbed Try to use proper reStructuredText for docstrings throughout. cmlenz parents: 386 diff changeset	165 example, a `START` or `TEXT` event.) Otherwise, it returns ``None``.
33 0e1fc0211416 Add doctests for path module. cmlenz parents: 27 diff changeset	166
230 24757b771651 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	167 >>> from genshi.input import XML
33 0e1fc0211416 Add doctests for path module. cmlenz parents: 27 diff changeset	168 >>> xml = XML('<root><elem><child id="1"/></elem><child id="2"/></root>')
0e1fc0211416 Add doctests for path module. cmlenz parents: 27 diff changeset	169 >>> test = Path('child').test()
305 6e6950ac0e56 Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	170 >>> for event in xml:
6e6950ac0e56 Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	171 ... if test(event, {}, {}):
386 921c873c2f0e Unit test fixes for Python 2.3. cmlenz parents: 384 diff changeset	172 ... print event[0], repr(event[1])
921c873c2f0e Unit test fixes for Python 2.3. cmlenz parents: 384 diff changeset	173 START (QName(u'child'), Attrs([(QName(u'id'), u'2')]))
498 5b42b341185a A couple of minor doc refinements. cmlenz parents: 425 diff changeset	174
5b42b341185a A couple of minor doc refinements. cmlenz parents: 425 diff changeset	175 :param ignore_context: if `True`, the path is interpreted like a pattern
5b42b341185a A couple of minor doc refinements. cmlenz parents: 425 diff changeset	176 in XSLT, meaning for example that it will match
5b42b341185a A couple of minor doc refinements. cmlenz parents: 425 diff changeset	177 at any depth
5b42b341185a A couple of minor doc refinements. cmlenz parents: 425 diff changeset	178 :return: a function that can be used to test individual events in a
5b42b341185a A couple of minor doc refinements. cmlenz parents: 425 diff changeset	179 stream against the path
5b42b341185a A couple of minor doc refinements. cmlenz parents: 425 diff changeset	180 :rtype: ``function``
26 039fc5b87405 * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	181 """
333 b70563ade748 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	182 paths = [(p, len(p), [0], [], [0] * len(p)) for p in [
b70563ade748 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	183 (ignore_context and [_DOTSLASHSLASH] or []) + p for p in self.paths
b70563ade748 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 ]]
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	185
306 3425c26d2c09 Minor optimization for XPath evaluation. cmlenz parents: 305 diff changeset	186 def _test(event, namespaces, variables, updateonly=False):
330 1dbeaef463e7 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	187 kind, data, pos = event[:3]
259 6f11ad260890 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	188 retval = None
228 f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	189 for steps, size, cursors, cutoff, counter in paths:
216 0a01371cecbc 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	190 # Manage the stack that tells us "where we are" in the stream
211 0a14c2a06be3 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	191 if kind is END:
228 f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	192 if cursors:
f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	193 cursors.pop()
211 0a14c2a06be3 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	194 continue
223 861105f3afe3 Fix typo introduced in [272]. cmlenz parents: 217 diff changeset	195 elif kind is START:
228 f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	196 cursors.append(cursors and cursors[-1] or 0)
259 6f11ad260890 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	197
306 3425c26d2c09 Minor optimization for XPath evaluation. cmlenz parents: 305 diff changeset	198 if updateonly or retval or not cursors:
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	199 continue
228 f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	200 cursor = cursors[-1]
f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	201 depth = len(cursors)
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	202
228 f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	203 if cutoff and depth + int(kind is not START) > cutoff[0]:
216 0a01371cecbc 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	204 continue
0a01371cecbc 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	205
0a01371cecbc 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	206 ctxtnode = not ignore_context and kind is START \
228 f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	207 and depth == 2
259 6f11ad260890 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	208 matched = None
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	209 while 1:
216 0a01371cecbc 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 # Fetch the next location step
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	211 axis, nodetest, predicates = steps[cursor]
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	212
216 0a01371cecbc 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	213 # If this is the start event for the context node, and the
0a01371cecbc 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	214 # axis of the location step doesn't include the current
0a01371cecbc 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 # element, skip the test
0a01371cecbc 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	216 if ctxtnode and (axis is CHILD or axis is DESCENDANT):
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	217 break
8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	218
216 0a01371cecbc 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 # Is this the last step of the location path?
0a01371cecbc 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 last_step = cursor + 1 == size
0a01371cecbc 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
0a01371cecbc 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	222 # Perform the actual node test
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	223 matched = nodetest(kind, data, pos, namespaces, variables)
216 0a01371cecbc 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
0a01371cecbc 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 # The node test matched
0a01371cecbc 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 if matched:
0a01371cecbc 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
0a01371cecbc 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	228 # Check all the predicates for this step
0a01371cecbc 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 if predicates:
0a01371cecbc 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 for predicate in predicates:
228 f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	231 pretval = predicate(kind, data, pos, namespaces,
f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	232 variables)
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	233 if type(pretval) is float: # FIXME <- need to
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	234 # check this for
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	235 # other types that
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	236 # can be coerced to
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	237 # float
228 f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	238 counter[cursor] += 1
f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	239 if counter[cursor] != int(pretval):
f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	240 pretval = False
f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	241 if not pretval:
216 0a01371cecbc 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	242 matched = None
0a01371cecbc 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	243 break
0a01371cecbc 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	244
0a01371cecbc 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	245 # Both the node test and the predicates matched
0a01371cecbc 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	246 if matched:
0a01371cecbc 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 if last_step:
217 d8b195b22a44 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	248 if not ctxtnode or kind is not START \
d8b195b22a44 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	249 or axis is ATTRIBUTE or axis is SELF:
216 0a01371cecbc 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 retval = matched
0a01371cecbc 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 elif not ctxtnode or axis is SELF \
0a01371cecbc 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 or axis is DESCENDANT_OR_SELF:
0a01371cecbc 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	253 cursor += 1
228 f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	254 cursors[-1] = cursor
216 0a01371cecbc 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 cutoff[:] = []
228 f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	256
333 b70563ade748 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	257 if kind is START:
b70563ade748 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	258 if last_step and not (axis is DESCENDANT or
b70563ade748 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	259 axis is DESCENDANT_OR_SELF):
228 f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	260 cutoff[:] = [depth]
216 0a01371cecbc 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	261
333 b70563ade748 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 elif steps[cursor][0] is ATTRIBUTE:
216 0a01371cecbc 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	263 # If the axis of the next location step is the
363 caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead. cmlenz parents: 333 diff changeset	264 # attribute axis, we need to move on to processing
caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead. cmlenz parents: 333 diff changeset	265 # that step without waiting for the next markup
caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead. cmlenz parents: 333 diff changeset	266 # event
216 0a01371cecbc 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	267 continue
0a01371cecbc 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
0a01371cecbc 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	269 # We're done with this step if it's the last step or the
0a01371cecbc 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	270 # axis isn't "self"
384 1596045ff0f3 Fix for infinite loop in XPath test. Closes #82. cmlenz parents: 364 diff changeset	271 if not matched or last_step or not (
1596045ff0f3 Fix for infinite loop in XPath test. Closes #82. cmlenz parents: 364 diff changeset	272 axis is SELF or axis is DESCENDANT_OR_SELF):
216 0a01371cecbc 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 break
0a01371cecbc 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
333 b70563ade748 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	275 if (retval or not matched) and kind is START and \
b70563ade748 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	276 not (axis is DESCENDANT or axis is DESCENDANT_OR_SELF):
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	277 # If this step is not a closure, it cannot be matched until
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	278 # the current element is closed... so we need to move the
114 8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	279 # cursor back to the previous closure and retest that
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	280 # against the current element
333 b70563ade748 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	281 backsteps = [(i, k, d, p) for i, (k, d, p)
b70563ade748 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 in enumerate(steps[:cursor])
215 e92135672812 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	283 if k is DESCENDANT or k is DESCENDANT_OR_SELF]
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	284 backsteps.reverse()
333 b70563ade748 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	285 for cursor, axis, nodetest, predicates in backsteps:
b70563ade748 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	286 if nodetest(kind, data, pos, namespaces, variables):
b70563ade748 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	287 cutoff[:] = []
b70563ade748 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 break
228 f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	289 cursors[-1] = cursor
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	290
259 6f11ad260890 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	291 return retval
1 821114ec4f69 Initial import. cmlenz parents: diff changeset	292
821114ec4f69 Initial import. cmlenz parents: diff changeset	293 return _test
821114ec4f69 Initial import. cmlenz parents: diff changeset	294
821114ec4f69 Initial import. cmlenz parents: diff changeset	295
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	296 class PathSyntaxError(Exception):
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	297 """Exception raised when an XPath expression is syntactically incorrect."""
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	298
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	299 def __init__(self, message, filename=None, lineno=-1, offset=-1):
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	300 if filename:
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	301 message = '%s (%s, line %d)' % (message, filename, lineno)
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	302 Exception.__init__(self, message)
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	303 self.filename = filename
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	304 self.lineno = lineno
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	305 self.offset = offset
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	306
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	307
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	308 class PathParser(object):
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	309 """Tokenizes and parses an XPath expression."""
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	310
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	311 _QUOTES = (("'", "'"), ('"', '"'))
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	312 _TOKENS = ('::', ':', '..', '.', '//', '/', '[', ']', '()', '(', ')', '@',
179 a2e0a7986d19 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	313 '=', '!=', '!', '\|', ',', '>=', '>', '<=', '<', '$')
163 9df6f057efd3 Support for XPath number literals including decimal places. cmlenz parents: 162 diff changeset	314 _tokenize = re.compile('("[^"]")\|(\'[^\']\')\|((?:\d+)?\.\d+)\|(%s)\|([^%s\s]+)\|\s+' % (
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	315 '\|'.join([re.escape(t) for t in _TOKENS]),
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	316 ''.join([re.escape(t[0]) for t in _TOKENS]))).findall
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	317
139 54131cbb91a5 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	318 def __init__(self, text, filename=None, lineno=-1):
54131cbb91a5 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	319 self.filename = filename
54131cbb91a5 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	320 self.lineno = lineno
163 9df6f057efd3 Support for XPath number literals including decimal places. cmlenz parents: 162 diff changeset	321 self.tokens = filter(None, [dqstr or sqstr or number or token or name
9df6f057efd3 Support for XPath number literals including decimal places. cmlenz parents: 162 diff changeset	322 for dqstr, sqstr, number, token, name in
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	323 self._tokenize(text)])
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	324 self.pos = 0
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	325
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	326 # Tokenizer
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	327
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	328 at_end = property(lambda self: self.pos == len(self.tokens) - 1)
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	329 cur_token = property(lambda self: self.tokens[self.pos])
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	330
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	331 def next_token(self):
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	332 self.pos += 1
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	333 return self.tokens[self.pos]
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	334
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	335 def peek_token(self):
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	336 if not self.at_end:
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	337 return self.tokens[self.pos + 1]
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	338 return None
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	339
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	340 # Recursive descent parser
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	341
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	342 def parse(self):
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	343 """Parses the XPath expression and returns a list of location path
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	344 tests.
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	345
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	346 For union expressions (such as `*\|text()`), this function returns one
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	347 test for each operand in the union. For patch expressions that don't
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	348 use the union operator, the function always returns a list of size 1.
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	349
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	350 Each path test in turn is a sequence of tests that correspond to the
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	351 location steps, each tuples of the form `(axis, testfunc, predicates)`
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	352 """
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	353 paths = [self._location_path()]
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	354 while self.cur_token == '\|':
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	355 self.next_token()
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	356 paths.append(self._location_path())
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	357 if not self.at_end:
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	358 raise PathSyntaxError('Unexpected token %r after end of expression'
139 54131cbb91a5 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	359 % self.cur_token, self.filename, self.lineno)
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	360 return paths
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	361
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	362 def _location_path(self):
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	363 steps = []
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	364 while True:
215 e92135672812 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	365 if self.cur_token.startswith('/'):
e92135672812 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	366 if self.cur_token == '//':
e92135672812 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	367 steps.append((DESCENDANT_OR_SELF, NodeTest(), []))
e92135672812 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	368 elif not steps:
e92135672812 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	369 raise PathSyntaxError('Absolute location paths not '
e92135672812 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	370 'supported', self.filename,
e92135672812 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	371 self.lineno)
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	372 self.next_token()
8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	373
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	374 axis, nodetest, predicates = self._location_step()
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	375 if not axis:
145 56d534eb53f9 * Fix error in expression evaluation when the expression evaluates to an iterable that does not produce event tuples. cmlenz parents: 139 diff changeset	376 axis = CHILD
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	377 steps.append((axis, nodetest, predicates))
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	378
8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	379 if self.at_end or not self.cur_token.startswith('/'):
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	380 break
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	381
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	382 return steps
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	383
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	384 def _location_step(self):
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	385 if self.cur_token == '@':
114 8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	386 axis = ATTRIBUTE
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	387 self.next_token()
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	388 elif self.cur_token == '.':
114 8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	389 axis = SELF
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	390 elif self.cur_token == '..':
139 54131cbb91a5 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	391 raise PathSyntaxError('Unsupported axis "parent"', self.filename,
54131cbb91a5 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	392 self.lineno)
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	393 elif self.peek_token() == '::':
114 8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	394 axis = Axis.forname(self.cur_token)
8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	395 if axis is None:
139 54131cbb91a5 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	396 raise PathSyntaxError('Unsupport axis "%s"' % axis,
54131cbb91a5 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	397 self.filename, self.lineno)
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	398 self.next_token()
8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	399 self.next_token()
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	400 else:
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	401 axis = None
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	402 nodetest = self._node_test(axis or CHILD)
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	403 predicates = []
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	404 while self.cur_token == '[':
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	405 predicates.append(self._predicate())
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	406 return axis, nodetest, predicates
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	407
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	408 def _node_test(self, axis=None):
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	409 test = prefix = None
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	410 next_token = self.peek_token()
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	411 if next_token in ('(', '()'): # Node type test
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	412 test = self._node_type()
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	413
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	414 elif next_token == ':': # Namespace prefix
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	415 prefix = self.cur_token
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	416 self.next_token()
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	417 localname = self.next_token()
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	418 if localname == '*':
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	419 test = QualifiedPrincipalTypeTest(axis, prefix)
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	420 else:
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	421 test = QualifiedNameTest(axis, prefix, localname)
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	422
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	423 else: # Name test
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	424 if self.cur_token == '*':
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	425 test = PrincipalTypeTest(axis)
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	426 elif self.cur_token == '.':
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	427 test = NodeTest()
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	428 else:
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	429 test = LocalNameTest(axis, self.cur_token)
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	430
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	431 if not self.at_end:
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	432 self.next_token()
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	433 return test
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	434
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	435 def _node_type(self):
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	436 name = self.cur_token
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	437 self.next_token()
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	438
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	439 args = []
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	440 if self.cur_token != '()':
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	441 # The processing-instruction() function optionally accepts the
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	442 # name of the PI as argument, which must be a literal string
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	443 self.next_token() # (
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	444 if self.cur_token != ')':
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	445 string = self.cur_token
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	446 if (string[0], string[-1]) in self._QUOTES:
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	447 string = string[1:-1]
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	448 args.append(string)
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	449
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	450 cls = _nodetest_map.get(name)
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	451 if not cls:
139 54131cbb91a5 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	452 raise PathSyntaxError('%s() not allowed here' % name, self.filename,
54131cbb91a5 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	453 self.lineno)
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	454 return cls(*args)
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	455
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	456 def _predicate(self):
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	457 assert self.cur_token == '['
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	458 self.next_token()
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	459 expr = self._or_expr()
121 22a7080ed242 Added support for the XPath functions `name()`, `namespace-uri()`, `local-name()`, and `not()`. cmlenz parents: 114 diff changeset	460 if self.cur_token != ']':
22a7080ed242 Added support for the XPath functions `name()`, `namespace-uri()`, `local-name()`, and `not()`. cmlenz parents: 114 diff changeset	461 raise PathSyntaxError('Expected "]" to close predicate, '
139 54131cbb91a5 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	462 'but found "%s"' % self.cur_token,
54131cbb91a5 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	463 self.filename, self.lineno)
111 8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	464 if not self.at_end:
8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	465 self.next_token()
8a4d9064f363 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	466 return expr
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	467
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	468 def _or_expr(self):
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	469 expr = self._and_expr()
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	470 while self.cur_token == 'or':
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	471 self.next_token()
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	472 expr = OrOperator(expr, self._and_expr())
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	473 return expr
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	474
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	475 def _and_expr(self):
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	476 expr = self._equality_expr()
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	477 while self.cur_token == 'and':
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	478 self.next_token()
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	479 expr = AndOperator(expr, self._equality_expr())
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	480 return expr
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	481
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	482 def _equality_expr(self):
162 f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	483 expr = self._relational_expr()
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	484 while self.cur_token in ('=', '!='):
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	485 op = _operator_map[self.cur_token]
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	486 self.next_token()
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	487 expr = op(expr, self._relational_expr())
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	488 return expr
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	489
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	490 def _relational_expr(self):
516 0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	491 expr = self._sub_expr()
162 f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	492 while self.cur_token in ('>', '>=', '<', '>='):
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	493 op = _operator_map[self.cur_token]
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	494 self.next_token()
516 0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	495 expr = op(expr, self._sub_expr())
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	496 return expr
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	497
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	498 def _sub_expr(self):
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	499 token = self.cur_token
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	500 if token != '(':
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	501 return self._primary_expr()
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	502 self.next_token()
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	503 expr = self._or_expr()
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	504 if self.cur_token != ')':
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	505 raise PathSyntaxError('Expected ")" to close sub-expression, '
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	506 'but found "%s"' % self.cur_token,
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	507 self.filename, self.lineno)
0e5a25f1b83d Implemented XPath sub-expressions. athomas parents: 498 diff changeset	508 self.next_token()
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	509 return expr
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	510
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	511 def _primary_expr(self):
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	512 token = self.cur_token
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	513 if len(token) > 1 and (token[0], token[-1]) in self._QUOTES:
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	514 self.next_token()
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	515 return StringLiteral(token[1:-1])
163 9df6f057efd3 Support for XPath number literals including decimal places. cmlenz parents: 162 diff changeset	516 elif token[0].isdigit() or token[0] == '.':
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	517 self.next_token()
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	518 return NumberLiteral(as_float(token))
179 a2e0a7986d19 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	519 elif token == '$':
a2e0a7986d19 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	520 token = self.next_token()
a2e0a7986d19 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	521 self.next_token()
a2e0a7986d19 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	522 return VariableReference(token)
121 22a7080ed242 Added support for the XPath functions `name()`, `namespace-uri()`, `local-name()`, and `not()`. cmlenz parents: 114 diff changeset	523 elif not self.at_end and self.peek_token().startswith('('):
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	524 return self._function_call()
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	525 else:
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	526 axis = None
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	527 if token == '@':
114 8f53c3ad385c Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	528 axis = ATTRIBUTE
106 61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	529 self.next_token()
61fa4cadb766 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	530 return self._node_test(axis)
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	531
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	532 def _function_call(self):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	533 name = self.cur_token
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	534 if self.next_token() == '()':
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	535 args = []
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	536 else:
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	537 assert self.cur_token == '('
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	538 self.next_token()
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	539 args = [self._or_expr()]
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	540 while self.cur_token == ',':
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	541 self.next_token()
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	542 args.append(self._or_expr())
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	543 if not self.cur_token == ')':
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	544 raise PathSyntaxError('Expected ")" to close function argument '
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	545 'list, but found "%s"' % self.cur_token,
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	546 self.filename, self.lineno)
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	547 self.next_token()
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	548 cls = _function_map.get(name)
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	549 if not cls:
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	550 raise PathSyntaxError('Unsupported function "%s"' % name,
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	551 self.filename, self.lineno)
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	552 return cls(*args)
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	553
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	554
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	555 # Type coercion
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	556
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	557 def as_scalar(value):
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	558 """Convert value to a scalar. If a single element Attrs() object is passed
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	559 the value of the single attribute will be returned."""
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	560 if isinstance(value, Attrs):
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	561 assert len(value) == 1
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	562 return value[0][1]
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	563 else:
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	564 return value
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	565
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	566 def as_float(value):
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	567 # FIXME - if value is a bool it will be coerced to 0.0 and consequently
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	568 # compared as a float. This is probably not ideal.
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	569 return float(as_scalar(value))
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	570
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	571 def as_long(value):
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	572 return long(as_scalar(value))
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	573
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	574 def as_string(value):
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	575 value = as_scalar(value)
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	576 if value is False:
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	577 return u''
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	578 return unicode(value)
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	579
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	580 def as_bool(value):
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	581 return bool(as_scalar(value))
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	582
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	583
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	584 # Node tests
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	585
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	586 class PrincipalTypeTest(object):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	587 """Node test that matches any event with the given principal type."""
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	588 __slots__ = ['principal_type']
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	589 def __init__(self, principal_type):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	590 self.principal_type = principal_type
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	591 def __call__(self, kind, data, pos, namespaces, variables):
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	592 if kind is START:
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	593 if self.principal_type is ATTRIBUTE:
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	594 return data[1] or None
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	595 else:
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	596 return True
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	597 def __repr__(self):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	598 return '*'
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	599
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	600 class QualifiedPrincipalTypeTest(object):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	601 """Node test that matches any event with the given principal type in a
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	602 specific namespace."""
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	603 __slots__ = ['principal_type', 'prefix']
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	604 def __init__(self, principal_type, prefix):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	605 self.principal_type = principal_type
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	606 self.prefix = prefix
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	607 def __call__(self, kind, data, pos, namespaces, variables):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	608 namespace = Namespace(namespaces.get(self.prefix))
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	609 if kind is START:
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	610 if self.principal_type is ATTRIBUTE and data[1]:
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	611 return Attrs([(name, value) for name, value in data[1]
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	612 if name in namespace]) or None
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	613 else:
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	614 return data[0] in namespace
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	615 def __repr__(self):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	616 return '%s:*' % self.prefix
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	617
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	618 class LocalNameTest(object):
364 41d6eb7885ec Fix for #77: match templates were matching their own output. cmlenz parents: 363 diff changeset	619 """Node test that matches any event with the given principal type and
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	620 local name.
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	621 """
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	622 __slots__ = ['principal_type', 'name']
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	623 def __init__(self, principal_type, name):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	624 self.principal_type = principal_type
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	625 self.name = name
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	626 def __call__(self, kind, data, pos, namespaces, variables):
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	627 if kind is START:
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	628 if self.principal_type is ATTRIBUTE and self.name in data[1]:
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	629 return Attrs([(self.name, data[1].get(self.name))])
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	630 else:
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	631 return data[0].localname == self.name
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	632 def __repr__(self):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	633 return self.name
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	634
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	635 class QualifiedNameTest(object):
364 41d6eb7885ec Fix for #77: match templates were matching their own output. cmlenz parents: 363 diff changeset	636 """Node test that matches any event with the given principal type and
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	637 qualified name.
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	638 """
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	639 __slots__ = ['principal_type', 'prefix', 'name']
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	640 def __init__(self, principal_type, prefix, name):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	641 self.principal_type = principal_type
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	642 self.prefix = prefix
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	643 self.name = name
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	644 def __call__(self, kind, data, pos, namespaces, variables):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	645 qname = QName('%s}%s' % (namespaces.get(self.prefix), self.name))
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	646 if kind is START:
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	647 if self.principal_type is ATTRIBUTE and qname in data[1]:
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	648 return Attrs([(self.name, data[1].get(self.name))])
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	649 else:
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	650 return data[0] == qname
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	651 def __repr__(self):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	652 return '%s:%s' % (self.prefix, self.name)
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	653
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	654 class CommentNodeTest(object):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	655 """Node test that matches any comment events."""
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	656 __slots__ = []
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	657 def __call__(self, kind, data, pos, namespaces, variables):
330 1dbeaef463e7 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	658 return kind is COMMENT
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	659 def __repr__(self):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	660 return 'comment()'
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	661
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	662 class NodeTest(object):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	663 """Node test that matches any node."""
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	664 __slots__ = []
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	665 def __call__(self, kind, data, pos, namespaces, variables):
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	666 if kind is START:
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	667 return True
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	668 return kind, data, pos
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	669 def __repr__(self):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	670 return 'node()'
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	671
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	672 class ProcessingInstructionNodeTest(object):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	673 """Node test that matches any processing instruction event."""
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	674 __slots__ = ['target']
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	675 def __init__(self, target=None):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	676 self.target = target
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	677 def __call__(self, kind, data, pos, namespaces, variables):
330 1dbeaef463e7 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	678 return kind is PI and (not self.target or data[0] == self.target)
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	679 def __repr__(self):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	680 arg = ''
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	681 if self.target:
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	682 arg = '"' + self.target + '"'
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	683 return 'processing-instruction(%s)' % arg
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	684
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	685 class TextNodeTest(object):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	686 """Node test that matches any text event."""
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	687 __slots__ = []
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	688 def __call__(self, kind, data, pos, namespaces, variables):
330 1dbeaef463e7 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	689 return kind is TEXT
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	690 def __repr__(self):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	691 return 'text()'
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	692
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	693 _nodetest_map = {'comment': CommentNodeTest, 'node': NodeTest,
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	694 'processing-instruction': ProcessingInstructionNodeTest,
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	695 'text': TextNodeTest}
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	696
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	697 # Functions
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	698
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	699 class Function(object):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	700 """Base class for function nodes in XPath expressions."""
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	701
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	702 class BooleanFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	703 """The `boolean` function, which converts its argument to a boolean
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	704 value.
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	705 """
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	706 __slots__ = ['expr']
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	707 def __init__(self, expr):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	708 self.expr = expr
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	709 def __call__(self, kind, data, pos, namespaces, variables):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	710 val = self.expr(kind, data, pos, namespaces, variables)
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	711 return as_bool(val)
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	712 def __repr__(self):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	713 return 'boolean(%r)' % self.expr
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	714
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	715 class CeilingFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	716 """The `ceiling` function, which returns the nearest lower integer number
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	717 for the given number.
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	718 """
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	719 __slots__ = ['number']
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	720 def __init__(self, number):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	721 self.number = number
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	722 def __call__(self, kind, data, pos, namespaces, variables):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	723 number = self.number(kind, data, pos, namespaces, variables)
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	724 return ceil(as_float(number))
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	725 def __repr__(self):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	726 return 'ceiling(%r)' % self.number
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	727
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	728 class ConcatFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	729 """The `concat` function, which concatenates (joins) the variable number of
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	730 strings it gets as arguments.
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	731 """
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	732 __slots__ = ['exprs']
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	733 def __init__(self, *exprs):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	734 self.exprs = exprs
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	735 def __call__(self, kind, data, pos, namespaces, variables):
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	736 strings = []
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	737 for item in [expr(kind, data, pos, namespaces, variables)
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	738 for expr in self.exprs]:
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	739 strings.append(as_string(item))
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	740 return u''.join(strings)
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	741 def __repr__(self):
169 ce0bfdff334c Fix syntax error in `path` module. cmlenz parents: 164 diff changeset	742 return 'concat(%s)' % ', '.join([repr(expr) for expr in self.exprs])
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	743
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	744 class ContainsFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	745 """The `contains` function, which returns whether a string contains a given
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	746 substring.
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	747 """
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	748 __slots__ = ['string1', 'string2']
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	749 def __init__(self, string1, string2):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	750 self.string1 = string1
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	751 self.string2 = string2
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	752 def __call__(self, kind, data, pos, namespaces, variables):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	753 string1 = self.string1(kind, data, pos, namespaces, variables)
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	754 string2 = self.string2(kind, data, pos, namespaces, variables)
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	755 return as_string(string2) in as_string(string1)
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	756 def __repr__(self):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	757 return 'contains(%r, %r)' % (self.string1, self.string2)
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	758
534 cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	759 class MatchesFunction(Function):
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	760 """The `matches` function, which returns whether a string matches a regular
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	761 expression.
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	762 """
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	763 __slots__ = ['string1', 'string2']
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	764 flag_mapping = {'s': re.S, 'm': re.M, 'i': re.I, 'x': re.X}
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	765
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	766 def __init__(self, string1, string2, flags=''):
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	767 self.string1 = string1
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	768 self.string2 = string2
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	769 self.flags = self._map_flags(flags)
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	770 def __call__(self, kind, data, pos, namespaces, variables):
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	771 string1 = as_string(self.string1(kind, data, pos, namespaces, variables))
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	772 string2 = as_string(self.string2(kind, data, pos, namespaces, variables))
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	773 return re.search(string2, string1, self.flags)
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	774 def _map_flags(self, flags):
593 aa5762c7b7f1 Minor, cosmetic tweaks. cmlenz parents: 534 diff changeset	775 return reduce(operator.or_,
534 cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	776 [self.flag_map[flag] for flag in flags], re.U)
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	777 def __repr__(self):
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	778 return 'contains(%r, %r)' % (self.string1, self.string2)
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	779
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	780 class FalseFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	781 """The `false` function, which always returns the boolean `false` value."""
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	782 __slots__ = []
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	783 def __call__(self, kind, data, pos, namespaces, variables):
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	784 return False
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	785 def __repr__(self):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	786 return 'false()'
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	787
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	788 class FloorFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	789 """The `ceiling` function, which returns the nearest higher integer number
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	790 for the given number.
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	791 """
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	792 __slots__ = ['number']
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	793 def __init__(self, number):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	794 self.number = number
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	795 def __call__(self, kind, data, pos, namespaces, variables):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	796 number = self.number(kind, data, pos, namespaces, variables)
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	797 return floor(as_float(number))
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	798 def __repr__(self):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	799 return 'floor(%r)' % self.number
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	800
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	801 class LocalNameFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	802 """The `local-name` function, which returns the local name of the current
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	803 element.
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	804 """
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	805 __slots__ = []
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	806 def __call__(self, kind, data, pos, namespaces, variables):
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	807 if kind is START:
234 4501f2fef82f * Minor simplification of XPath engine. cmlenz parents: 230 diff changeset	808 return data[0].localname
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	809 def __repr__(self):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	810 return 'local-name()'
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	811
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	812 class NameFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	813 """The `name` function, which returns the qualified name of the current
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	814 element.
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	815 """
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	816 __slots__ = []
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	817 def __call__(self, kind, data, pos, namespaces, variables):
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	818 if kind is START:
234 4501f2fef82f * Minor simplification of XPath engine. cmlenz parents: 230 diff changeset	819 return data[0]
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	820 def __repr__(self):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	821 return 'name()'
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	822
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	823 class NamespaceUriFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	824 """The `namespace-uri` function, which returns the namespace URI of the
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	825 current element.
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	826 """
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	827 __slots__ = []
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	828 def __call__(self, kind, data, pos, namespaces, variables):
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	829 if kind is START:
234 4501f2fef82f * Minor simplification of XPath engine. cmlenz parents: 230 diff changeset	830 return data[0].namespace
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	831 def __repr__(self):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	832 return 'namespace-uri()'
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	833
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	834 class NotFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	835 """The `not` function, which returns the negated boolean value of its
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	836 argument.
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	837 """
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	838 __slots__ = ['expr']
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	839 def __init__(self, expr):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	840 self.expr = expr
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	841 def __call__(self, kind, data, pos, namespaces, variables):
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	842 return not as_bool(self.expr(kind, data, pos, namespaces, variables))
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	843 def __repr__(self):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	844 return 'not(%s)' % self.expr
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	845
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	846 class NormalizeSpaceFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	847 """The `normalize-space` function, which removes leading and trailing
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	848 whitespace in the given string, and replaces multiple adjacent whitespace
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	849 characters inside the string with a single space.
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	850 """
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	851 __slots__ = ['expr']
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	852 _normalize = re.compile(r'\s{2,}').sub
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	853 def __init__(self, expr):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	854 self.expr = expr
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	855 def __call__(self, kind, data, pos, namespaces, variables):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	856 string = self.expr(kind, data, pos, namespaces, variables)
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	857 return self._normalize(' ', as_string(string).strip())
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	858 def __repr__(self):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	859 return 'normalize-space(%s)' % repr(self.expr)
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	860
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	861 class NumberFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	862 """The `number` function that converts its argument to a number."""
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	863 __slots__ = ['expr']
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	864 def __init__(self, expr):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	865 self.expr = expr
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	866 def __call__(self, kind, data, pos, namespaces, variables):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	867 val = self.expr(kind, data, pos, namespaces, variables)
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	868 return as_float(val)
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	869 def __repr__(self):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	870 return 'number(%r)' % self.expr
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	871
162 f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	872 class RoundFunction(Function):
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	873 """The `round` function, which returns the nearest integer number for the
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	874 given number.
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	875 """
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	876 __slots__ = ['number']
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	877 def __init__(self, number):
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	878 self.number = number
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	879 def __call__(self, kind, data, pos, namespaces, variables):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	880 number = self.number(kind, data, pos, namespaces, variables)
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	881 return round(as_float(number))
162 f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	882 def __repr__(self):
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	883 return 'round(%r)' % self.number
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	884
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	885 class StartsWithFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	886 """The `starts-with` function that returns whether one string starts with
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	887 a given substring.
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	888 """
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	889 __slots__ = ['string1', 'string2']
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	890 def __init__(self, string1, string2):
282 db5bdeca9192 Fix `starts-with()` XPath function so that it actually compares the two strings. Closes #61. cmlenz parents: 259 diff changeset	891 self.string1 = string1
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	892 self.string2 = string2
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	893 def __call__(self, kind, data, pos, namespaces, variables):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	894 string1 = self.string1(kind, data, pos, namespaces, variables)
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	895 string2 = self.string2(kind, data, pos, namespaces, variables)
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	896 return as_string(string1).startswith(as_string(string2))
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	897 def __repr__(self):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	898 return 'starts-with(%r, %r)' % (self.string1, self.string2)
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	899
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	900 class StringLengthFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	901 """The `string-length` function that returns the length of the given
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	902 string.
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	903 """
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	904 __slots__ = ['expr']
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	905 def __init__(self, expr):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	906 self.expr = expr
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	907 def __call__(self, kind, data, pos, namespaces, variables):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	908 string = self.expr(kind, data, pos, namespaces, variables)
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	909 return len(as_string(string))
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	910 def __repr__(self):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	911 return 'string-length(%r)' % self.expr
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	912
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	913 class SubstringFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	914 """The `substring` function that returns the part of a string that starts
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	915 at the given offset, and optionally limited to the given length.
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	916 """
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	917 __slots__ = ['string', 'start', 'length']
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	918 def __init__(self, string, start, length=None):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	919 self.string = string
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	920 self.start = start
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	921 self.length = length
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	922 def __call__(self, kind, data, pos, namespaces, variables):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	923 string = self.string(kind, data, pos, namespaces, variables)
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	924 start = self.start(kind, data, pos, namespaces, variables)
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	925 length = 0
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	926 if self.length is not None:
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	927 length = self.length(kind, data, pos, namespaces, variables)
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	928 return string[as_long(start):len(as_string(string)) - as_long(length)]
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	929 def __repr__(self):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	930 if self.length is not None:
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	931 return 'substring(%r, %r, %r)' % (self.string, self.start,
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	932 self.length)
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	933 else:
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	934 return 'substring(%r, %r)' % (self.string, self.start)
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	935
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	936 class SubstringAfterFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	937 """The `substring-after` function that returns the part of a string that
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	938 is found after the given substring.
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	939 """
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	940 __slots__ = ['string1', 'string2']
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	941 def __init__(self, string1, string2):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	942 self.string1 = string1
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	943 self.string2 = string2
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	944 def __call__(self, kind, data, pos, namespaces, variables):
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	945 string1 = as_string(self.string1(kind, data, pos, namespaces, variables))
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	946 string2 = as_string(self.string2(kind, data, pos, namespaces, variables))
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	947 index = string1.find(string2)
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	948 if index >= 0:
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	949 return string1[index + len(string2):]
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	950 return u''
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	951 def __repr__(self):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	952 return 'substring-after(%r, %r)' % (self.string1, self.string2)
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	953
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	954 class SubstringBeforeFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	955 """The `substring-before` function that returns the part of a string that
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	956 is found before the given substring.
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	957 """
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	958 __slots__ = ['string1', 'string2']
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	959 def __init__(self, string1, string2):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	960 self.string1 = string1
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	961 self.string2 = string2
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	962 def __call__(self, kind, data, pos, namespaces, variables):
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	963 string1 = as_string(self.string1(kind, data, pos, namespaces, variables))
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	964 string2 = as_string(self.string2(kind, data, pos, namespaces, variables))
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	965 index = string1.find(string2)
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	966 if index >= 0:
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	967 return string1[:index]
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	968 return u''
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	969 def __repr__(self):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	970 return 'substring-after(%r, %r)' % (self.string1, self.string2)
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	971
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	972 class TranslateFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	973 """The `translate` function that translates a set of characters in a
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	974 string to target set of characters.
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	975 """
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	976 __slots__ = ['string', 'fromchars', 'tochars']
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	977 def __init__(self, string, fromchars, tochars):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	978 self.string = string
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	979 self.fromchars = fromchars
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	980 self.tochars = tochars
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	981 def __call__(self, kind, data, pos, namespaces, variables):
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	982 string = as_string(self.string(kind, data, pos, namespaces, variables))
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	983 fromchars = as_string(self.fromchars(kind, data, pos, namespaces, variables))
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	984 tochars = as_string(self.tochars(kind, data, pos, namespaces, variables))
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	985 table = dict(zip([ord(c) for c in fromchars],
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	986 [ord(c) for c in tochars]))
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	987 return string.translate(table)
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	988 def __repr__(self):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	989 return 'translate(%r, %r, %r)' % (self.string, self.fromchars,
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	990 self.tochars)
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	991
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	992 class TrueFunction(Function):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	993 """The `true` function, which always returns the boolean `true` value."""
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	994 __slots__ = []
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	995 def __call__(self, kind, data, pos, namespaces, variables):
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	996 return True
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	997 def __repr__(self):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	998 return 'true()'
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	999
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1000 _function_map = {'boolean': BooleanFunction, 'ceiling': CeilingFunction,
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1001 'concat': ConcatFunction, 'contains': ContainsFunction,
534 cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	1002 'matches': MatchesFunction, 'false': FalseFunction, 'floor':
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	1003 FloorFunction, 'local-name': LocalNameFunction, 'name':
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	1004 NameFunction, 'namespace-uri': NamespaceUriFunction,
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1005 'normalize-space': NormalizeSpaceFunction, 'not': NotFunction,
162 f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1006 'number': NumberFunction, 'round': RoundFunction,
534 cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	1007 'starts-with': StartsWithFunction, 'string-length':
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	1008 StringLengthFunction, 'substring': SubstringFunction,
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	1009 'substring-after': SubstringAfterFunction, 'substring-before':
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	1010 SubstringBeforeFunction, 'translate': TranslateFunction,
cccb6c748609 Add XPath `matches()` function which, of course, supports the Python regular athomas parents: 518 diff changeset	1011 'true': TrueFunction}
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1012
179 a2e0a7986d19 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	1013 # Literals & Variables
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1014
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1015 class Literal(object):
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1016 """Abstract base class for literal nodes."""
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1017
50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1018 class StringLiteral(Literal):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1019 """A string literal node."""
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1020 __slots__ = ['text']
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1021 def __init__(self, text):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1022 self.text = text
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1023 def __call__(self, kind, data, pos, namespaces, variables):
228 f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	1024 return self.text
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1025 def __repr__(self):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1026 return '"%s"' % self.text
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1027
155 50d4b08017df * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	1028 class NumberLiteral(Literal):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1029 """A number literal node."""
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1030 __slots__ = ['number']
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1031 def __init__(self, number):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1032 self.number = number
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1033 def __call__(self, kind, data, pos, namespaces, variables):
228 f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	1034 return self.number
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1035 def __repr__(self):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1036 return str(self.number)
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1037
179 a2e0a7986d19 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	1038 class VariableReference(Literal):
a2e0a7986d19 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	1039 """A variable reference node."""
a2e0a7986d19 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	1040 __slots__ = ['name']
a2e0a7986d19 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	1041 def __init__(self, name):
a2e0a7986d19 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	1042 self.name = name
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1043 def __call__(self, kind, data, pos, namespaces, variables):
228 f79b20a50919 Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	1044 return variables.get(self.name)
179 a2e0a7986d19 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	1045 def __repr__(self):
215 e92135672812 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	1046 return str(self.name)
179 a2e0a7986d19 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	1047
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1048 # Operators
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1049
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1050 class AndOperator(object):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1051 """The boolean operator `and`."""
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1052 __slots__ = ['lval', 'rval']
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1053 def __init__(self, lval, rval):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1054 self.lval = lval
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1055 self.rval = rval
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1056 def __call__(self, kind, data, pos, namespaces, variables):
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1057 lval = as_bool(self.lval(kind, data, pos, namespaces, variables))
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1058 if not lval:
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1059 return False
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1060 rval = self.rval(kind, data, pos, namespaces, variables)
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1061 return as_bool(rval)
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1062 def __repr__(self):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1063 return '%s and %s' % (self.lval, self.rval)
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1064
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1065 class EqualsOperator(object):
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1066 """The equality operator `=`."""
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1067 __slots__ = ['lval', 'rval']
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1068 def __init__(self, lval, rval):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1069 self.lval = lval
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1070 self.rval = rval
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1071 def __call__(self, kind, data, pos, namespaces, variables):
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1072 lval = as_scalar(self.lval(kind, data, pos, namespaces, variables))
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1073 rval = as_scalar(self.rval(kind, data, pos, namespaces, variables))
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1074 return lval == rval
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1075 def __repr__(self):
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1076 return '%s=%s' % (self.lval, self.rval)
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1077
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1078 class NotEqualsOperator(object):
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1079 """The equality operator `!=`."""
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1080 __slots__ = ['lval', 'rval']
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1081 def __init__(self, lval, rval):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1082 self.lval = lval
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1083 self.rval = rval
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1084 def __call__(self, kind, data, pos, namespaces, variables):
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1085 lval = as_scalar(self.lval(kind, data, pos, namespaces, variables))
97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1086 rval = as_scalar(self.rval(kind, data, pos, namespaces, variables))
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1087 return lval != rval
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1088 def __repr__(self):
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1089 return '%s!=%s' % (self.lval, self.rval)
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1090
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1091 class OrOperator(object):
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1092 """The boolean operator `or`."""
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1093 __slots__ = ['lval', 'rval']
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1094 def __init__(self, lval, rval):
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1095 self.lval = lval
a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1096 self.rval = rval
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1097 def __call__(self, kind, data, pos, namespaces, variables):
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1098 lval = as_bool(self.lval(kind, data, pos, namespaces, variables))
161 a25f9fc5787d Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1099 if lval:
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1100 return True
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1101 rval = self.rval(kind, data, pos, namespaces, variables)
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1102 return as_bool(rval)
137 38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1103 def __repr__(self):
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1104 return '%s or %s' % (self.lval, self.rval)
38ddb21b6fa4 Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1105
162 f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1106 class GreaterThanOperator(object):
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1107 """The relational operator `>` (greater than)."""
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1108 __slots__ = ['lval', 'rval']
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1109 def __init__(self, lval, rval):
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1110 self.lval = lval
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1111 self.rval = rval
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1112 def __call__(self, kind, data, pos, namespaces, variables):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1113 lval = self.lval(kind, data, pos, namespaces, variables)
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1114 rval = self.rval(kind, data, pos, namespaces, variables)
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1115 return as_float(lval) > as_float(rval)
162 f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1116 def __repr__(self):
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1117 return '%s>%s' % (self.lval, self.rval)
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1118
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1119 class GreaterThanOrEqualOperator(object):
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1120 """The relational operator `>=` (greater than or equal)."""
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1121 __slots__ = ['lval', 'rval']
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1122 def __init__(self, lval, rval):
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1123 self.lval = lval
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1124 self.rval = rval
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1125 def __call__(self, kind, data, pos, namespaces, variables):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1126 lval = self.lval(kind, data, pos, namespaces, variables)
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1127 rval = self.rval(kind, data, pos, namespaces, variables)
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1128 return as_float(lval) >= as_float(rval)
162 f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1129 def __repr__(self):
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1130 return '%s>=%s' % (self.lval, self.rval)
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1131
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1132 class LessThanOperator(object):
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1133 """The relational operator `<` (less than)."""
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1134 __slots__ = ['lval', 'rval']
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1135 def __init__(self, lval, rval):
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1136 self.lval = lval
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1137 self.rval = rval
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1138 def __call__(self, kind, data, pos, namespaces, variables):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1139 lval = self.lval(kind, data, pos, namespaces, variables)
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1140 rval = self.rval(kind, data, pos, namespaces, variables)
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1141 return as_float(lval) < as_float(rval)
162 f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1142 def __repr__(self):
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1143 return '%s<%s' % (self.lval, self.rval)
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1144
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1145 class LessThanOrEqualOperator(object):
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1146 """The relational operator `<=` (less than or equal)."""
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1147 __slots__ = ['lval', 'rval']
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1148 def __init__(self, lval, rval):
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1149 self.lval = lval
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1150 self.rval = rval
224 e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1151 def __call__(self, kind, data, pos, namespaces, variables):
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1152 lval = self.lval(kind, data, pos, namespaces, variables)
e4dad1145f84 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1153 rval = self.rval(kind, data, pos, namespaces, variables)
518 97cdadc17e20 Attributes selected with an XPath are now returned as an `Attrs()` object in athomas parents: 516 diff changeset	1154 return as_float(lval) <= as_float(rval)
162 f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1155 def __repr__(self):
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1156 return '%s<=%s' % (self.lval, self.rval)
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1157
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1158 _operator_map = {'=': EqualsOperator, '!=': NotEqualsOperator,
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1159 '>': GreaterThanOperator, '>=': GreaterThanOrEqualOperator,
f767cf98e3e3 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1160 '<': LessThanOperator, '>=': LessThanOrEqualOperator}
333 b70563ade748 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	1161
b70563ade748 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	1162
b70563ade748 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	1163 _DOTSLASHSLASH = (DESCENDANT_OR_SELF, PrincipalTypeTest(None), ())

Mercurial > genshi > genshi-test

annotate genshi/path.py @ 593:aa5762c7b7f1