genshi/mirror: genshi/path.py annotate

annotate genshi/path.py @ 384:5b6e4335ee21 trunk

Fix for infinite loop in XPath test. Closes #82.

author	cmlenz
date	Mon, 04 Dec 2006 19:00:46 +0000
parents	7dabedbb53fb
children	c66370dfc41b

rev	line source
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	1 # -- coding: utf-8 --
5479aae32f5a Initial import. cmlenz parents: diff changeset	2 #
66 59eb24184e9c Switch copyright to Edgewall and URLs to markup.edgewall.org. cmlenz parents: 61 diff changeset	3 # Copyright (C) 2006 Edgewall Software
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	4 # All rights reserved.
5479aae32f5a Initial import. cmlenz parents: diff changeset	5 #
5479aae32f5a Initial import. cmlenz parents: diff changeset	6 # This software is licensed as described in the file COPYING, which
5479aae32f5a Initial import. cmlenz parents: diff changeset	7 # you should have received as part of this distribution. The terms
230 84168828b074 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	8 # are also available at http://genshi.edgewall.org/wiki/License.
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	9 #
5479aae32f5a Initial import. cmlenz parents: diff changeset	10 # This software consists of voluntary contributions made by many
5479aae32f5a Initial import. cmlenz parents: diff changeset	11 # individuals. For the exact contribution history, see the revision
230 84168828b074 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	12 # history and logs, available at http://genshi.edgewall.org/log/.
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	13
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	14 """Basic support for evaluating XPath expressions against streams.
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	15
230 84168828b074 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	16 >>> from genshi.input import XML
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	17 >>> doc = XML('''<doc>
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	18 ... <items count="2">
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	19 ... <item status="new">
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	20 ... <summary>Foo</summary>
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	21 ... </item>
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	22 ... <item status="closed">
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	23 ... <summary>Bar</summary>
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	24 ... </item>
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	25 ... </items>
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	26 ... </doc>''')
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	27 >>> print doc.select('items/item[@status="closed"]/summary/text()')
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	28 Bar
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	29
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	30 Because the XPath engine operates on markup streams (as opposed to tree
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	31 structures), it only implements a subset of the full XPath 1.0 language.
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	32 """
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	33
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	34 from math import ceil, floor
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	35 import re
5479aae32f5a Initial import. cmlenz parents: diff changeset	36
230 84168828b074 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	37 from genshi.core import Stream, Attrs, Namespace, QName
84168828b074 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	38 from genshi.core import START, END, TEXT, COMMENT, PI
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	39
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	40 __all__ = ['Path', 'PathSyntaxError']
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	41
5479aae32f5a Initial import. cmlenz parents: diff changeset	42
114 4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	43 class Axis(object):
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	44 """Defines constants for the various supported XPath axes."""
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	45
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	46 ATTRIBUTE = 'attribute'
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	47 CHILD = 'child'
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	48 DESCENDANT = 'descendant'
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	49 DESCENDANT_OR_SELF = 'descendant-or-self'
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	50 SELF = 'self'
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	51
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	52 def forname(cls, name):
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	53 """Return the axis constant for the given name, or `None` if no such
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	54 axis was defined.
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	55 """
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	56 return getattr(cls, name.upper().replace('-', '_'), None)
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	57 forname = classmethod(forname)
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	58
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	59
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	60 ATTRIBUTE = Axis.ATTRIBUTE
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	61 CHILD = Axis.CHILD
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	62 DESCENDANT = Axis.DESCENDANT
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	63 DESCENDANT_OR_SELF = Axis.DESCENDANT_OR_SELF
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	64 SELF = Axis.SELF
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	65
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	66
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	67 class Path(object):
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	68 """Implements basic XPath support on streams.
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	69
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	70 Instances of this class represent a "compiled" XPath expression, and provide
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	71 methods for testing the path against a stream, as well as extracting a
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	72 substream matching that path.
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	73 """
5479aae32f5a Initial import. cmlenz parents: diff changeset	74
139 8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	75 def __init__(self, text, filename=None, lineno=-1):
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	76 """Create the path object from a string.
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	77
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	78 @param text: the path expression
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	79 """
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	80 self.source = text
139 8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	81 self.paths = PathParser(text, filename, lineno).parse()
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	82
5479aae32f5a Initial import. cmlenz parents: diff changeset	83 def __repr__(self):
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	84 paths = []
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	85 for path in self.paths:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	86 steps = []
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	87 for axis, nodetest, predicates in path:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	88 steps.append('%s::%s' % (axis, nodetest))
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	89 for predicate in predicates:
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	90 steps[-1] += '[%s]' % predicate
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	91 paths.append('/'.join(steps))
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	92 return '<%s "%s">' % (self.__class__.__name__, '\|'.join(paths))
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	93
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	94 def select(self, stream, namespaces=None, variables=None):
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	95 """Returns a substream of the given stream that matches the path.
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	96
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	97 If there are no matches, this method returns an empty stream.
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	98
230 84168828b074 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	99 >>> from genshi.input import XML
33 1fdb7054fb42 Add doctests for path module. cmlenz parents: 27 diff changeset	100 >>> xml = XML('<root><elem><child>Text</child></elem></root>')
61 448792ab1303 Use a different namespace than Kid uses. cmlenz parents: 38 diff changeset	101
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	102 >>> print Path('.//child').select(xml)
33 1fdb7054fb42 Add doctests for path module. cmlenz parents: 27 diff changeset	103 <child>Text</child>
1fdb7054fb42 Add doctests for path module. cmlenz parents: 27 diff changeset	104
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	105 >>> print Path('.//child/text()').select(xml)
33 1fdb7054fb42 Add doctests for path module. cmlenz parents: 27 diff changeset	106 Text
1fdb7054fb42 Add doctests for path module. cmlenz parents: 27 diff changeset	107
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	108 @param stream: the stream to select from
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	109 @param namespaces: (optional) a mapping of namespace prefixes to URIs
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	110 @param variables: (optional) a mapping of variable names to values
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	111 @return: the substream matching the path, or an empty stream
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	112 """
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	113 if namespaces is None:
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	114 namespaces = {}
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	115 if variables is None:
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	116 variables = {}
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	117 stream = iter(stream)
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	118 def _generate():
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	119 test = self.test()
305 60111a041e7c Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	120 for event in stream:
60111a041e7c Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	121 result = test(event, namespaces, variables)
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	122 if result is True:
305 60111a041e7c Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	123 yield event
330 3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	124 if event[0] is START:
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	125 depth = 1
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	126 while depth > 0:
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	127 subevent = stream.next()
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	128 if subevent[0] is START:
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	129 depth += 1
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	130 elif subevent[0] is END:
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	131 depth -= 1
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	132 yield subevent
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	133 test(subevent, namespaces, variables,
3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	134 updateonly=True)
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	135 elif result:
5479aae32f5a Initial import. cmlenz parents: diff changeset	136 yield result
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	137 return Stream(_generate())
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	138
38 ee669cb9cccc Fix for #2 (incorrect context node in path expressions). Still some paths that produce incorrect results, but the common case seems to work now. cmlenz parents: 37 diff changeset	139 def test(self, ignore_context=False):
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	140 """Returns a function that can be used to track whether the path matches
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	141 a specific stream event.
3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	142
305 60111a041e7c Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	143 The function returned expects the positional arguments `event`,
60111a041e7c Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	144 `namespaces` and `variables`. The first is a stream event, while the
60111a041e7c Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	145 latter two are a mapping of namespace prefixes to URIs, and a mapping
306 095a754f95a8 Minor optimization for XPath evaluation. cmlenz parents: 305 diff changeset	146 of variable names to values, respectively. In addition, the function
095a754f95a8 Minor optimization for XPath evaluation. cmlenz parents: 305 diff changeset	147 accepts an `updateonly` keyword argument that default to `False`. If
095a754f95a8 Minor optimization for XPath evaluation. cmlenz parents: 305 diff changeset	148 it is set to `True`, the function only updates its internal state,
095a754f95a8 Minor optimization for XPath evaluation. cmlenz parents: 305 diff changeset	149 but does not perform any tests or return a result.
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	150
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	151 If the path matches the event, the function returns the match (for
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	152 example, a `START` or `TEXT` event.) Otherwise, it returns `None`.
33 1fdb7054fb42 Add doctests for path module. cmlenz parents: 27 diff changeset	153
230 84168828b074 Renamed Markup to Genshi in repository. cmlenz parents: 228 diff changeset	154 >>> from genshi.input import XML
33 1fdb7054fb42 Add doctests for path module. cmlenz parents: 27 diff changeset	155 >>> xml = XML('<root><elem><child id="1"/></elem><child id="2"/></root>')
1fdb7054fb42 Add doctests for path module. cmlenz parents: 27 diff changeset	156 >>> test = Path('child').test()
305 60111a041e7c Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	157 >>> for event in xml:
60111a041e7c Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	158 ... if test(event, {}, {}):
60111a041e7c Various performance-oriented tweaks. cmlenz parents: 282 diff changeset	159 ... print event
326 f999da894391 Fixed `__repr__` of the `QName`, `Attrs`, and `Expression` classes so that the output can be used as code to instantiate the object again. cmlenz parents: 306 diff changeset	160 ('START', (QName(u'child'), Attrs([(QName(u'id'), u'2')])), (None, 1, 34))
26 3c1a022be04c * Split out the XPath tests into a separate `unittest`-based file. cmlenz parents: 25 diff changeset	161 """
333 e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	162 paths = [(p, len(p), [0], [], [0] * len(p)) for p in [
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	163 (ignore_context and [_DOTSLASHSLASH] or []) + p for p in self.paths
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	164 ]]
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	165
306 095a754f95a8 Minor optimization for XPath evaluation. cmlenz parents: 305 diff changeset	166 def _test(event, namespaces, variables, updateonly=False):
330 3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	167 kind, data, pos = event[:3]
259 fe8dbe9066c1 Fix bug in evaluating XPath expressions using the union operator `\|`, which caused any path but the first to get out of sync with the event stream, and the whole thing returning too few results. cmlenz parents: 250 diff changeset	168 retval = None
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	169 for steps, size, cursors, cutoff, counter in paths:
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	170 # Manage the stack that tells us "where we are" in the stream
211 e5151983df0d Fix another regression introduced in [258]: some kinds of cascaded match templates were broken, for example in the TurboGears example app. cmlenz parents: 179 diff changeset	171 if kind is END:
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	172 if cursors:
a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	173 cursors.pop()
211 e5151983df0d Fix another regression introduced in [258]: some kinds of cascaded match templates were broken, for example in the TurboGears example app. cmlenz parents: 179 diff changeset	174 continue
223 9c199fcb9f31 Fix typo introduced in [272]. cmlenz parents: 217 diff changeset	175 elif kind is START:
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	176 cursors.append(cursors and cursors[-1] or 0)
259 fe8dbe9066c1 Fix bug in evaluating XPath expressions using the union operator `\|`, which caused any path but the first to get out of sync with the event stream, and the whole thing returning too few results. cmlenz parents: 250 diff changeset	177
306 095a754f95a8 Minor optimization for XPath evaluation. cmlenz parents: 305 diff changeset	178 if updateonly or retval or not cursors:
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	179 continue
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	180 cursor = cursors[-1]
a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	181 depth = len(cursors)
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	182
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	183 if cutoff and depth + int(kind is not START) > cutoff[0]:
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	184 continue
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	185
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	186 ctxtnode = not ignore_context and kind is START \
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	187 and depth == 2
259 fe8dbe9066c1 Fix bug in evaluating XPath expressions using the union operator `\|`, which caused any path but the first to get out of sync with the event stream, and the whole thing returning too few results. cmlenz parents: 250 diff changeset	188 matched = None
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	189 while 1:
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	190 # Fetch the next location step
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	191 axis, nodetest, predicates = steps[cursor]
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	192
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	193 # If this is the start event for the context node, and the
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	194 # axis of the location step doesn't include the current
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	195 # element, skip the test
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	196 if ctxtnode and (axis is CHILD or axis is DESCENDANT):
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	197 break
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	198
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	199 # Is this the last step of the location path?
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	200 last_step = cursor + 1 == size
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	201
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	202 # Perform the actual node test
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	203 matched = nodetest(kind, data, pos, namespaces, variables)
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	204
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	205 # The node test matched
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	206 if matched:
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	207
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	208 # Check all the predicates for this step
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	209 if predicates:
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	210 for predicate in predicates:
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	211 pretval = predicate(kind, data, pos, namespaces,
a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	212 variables)
a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	213 if type(pretval) is float:
a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	214 counter[cursor] += 1
a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	215 if counter[cursor] != int(pretval):
a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	216 pretval = False
a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	217 if not pretval:
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	218 matched = None
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	219 break
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	220
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	221 # Both the node test and the predicates matched
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	222 if matched:
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	223 if last_step:
217 f150cff4da18 Fix `py:match` directive which would screw up in some scenarios due to incorrect handling of the substream. Closes #49. cmlenz parents: 216 diff changeset	224 if not ctxtnode or kind is not START \
f150cff4da18 Fix `py:match` directive which would screw up in some scenarios due to incorrect handling of the substream. Closes #49. cmlenz parents: 216 diff changeset	225 or axis is ATTRIBUTE or axis is SELF:
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	226 retval = matched
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	227 elif not ctxtnode or axis is SELF \
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	228 or axis is DESCENDANT_OR_SELF:
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	229 cursor += 1
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	230 cursors[-1] = cursor
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	231 cutoff[:] = []
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	232
333 e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	233 if kind is START:
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	234 if last_step and not (axis is DESCENDANT or
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	235 axis is DESCENDANT_OR_SELF):
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	236 cutoff[:] = [depth]
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	237
333 e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	238 elif steps[cursor][0] is ATTRIBUTE:
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	239 # If the axis of the next location step is the
363 37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead. cmlenz parents: 333 diff changeset	240 # attribute axis, we need to move on to processing
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead. cmlenz parents: 333 diff changeset	241 # that step without waiting for the next markup
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead. cmlenz parents: 333 diff changeset	242 # event
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	243 continue
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	244
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	245 # We're done with this step if it's the last step or the
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	246 # axis isn't "self"
384 5b6e4335ee21 Fix for infinite loop in XPath test. Closes #82. cmlenz parents: 364 diff changeset	247 if not matched or last_step or not (
5b6e4335ee21 Fix for infinite loop in XPath test. Closes #82. cmlenz parents: 364 diff changeset	248 axis is SELF or axis is DESCENDANT_OR_SELF):
216 636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	249 break
636fe6766b4d Many fixes to XPath evaluation. Among other things, this should get rid of the bug that attributes were getting ?pulled up? by `py:match` directives using `py:attrs="select('@')"` (see #50). cmlenz* parents: 215 diff changeset	250
333 e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	251 if (retval or not matched) and kind is START and \
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	252 not (axis is DESCENDANT or axis is DESCENDANT_OR_SELF):
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	253 # If this step is not a closure, it cannot be matched until
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	254 # the current element is closed... so we need to move the
114 4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	255 # cursor back to the previous closure and retest that
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	256 # against the current element
333 e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	257 backsteps = [(i, k, d, p) for i, (k, d, p)
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	258 in enumerate(steps[:cursor])
215 94120e6b0ce4 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	259 if k is DESCENDANT or k is DESCENDANT_OR_SELF]
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	260 backsteps.reverse()
333 e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	261 for cursor, axis, nodetest, predicates in backsteps:
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	262 if nodetest(kind, data, pos, namespaces, variables):
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	263 cutoff[:] = []
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	264 break
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	265 cursors[-1] = cursor
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	266
259 fe8dbe9066c1 Fix bug in evaluating XPath expressions using the union operator `\|`, which caused any path but the first to get out of sync with the event stream, and the whole thing returning too few results. cmlenz parents: 250 diff changeset	267 return retval
1 5479aae32f5a Initial import. cmlenz parents: diff changeset	268
5479aae32f5a Initial import. cmlenz parents: diff changeset	269 return _test
5479aae32f5a Initial import. cmlenz parents: diff changeset	270
5479aae32f5a Initial import. cmlenz parents: diff changeset	271
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	272 class PathSyntaxError(Exception):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	273 """Exception raised when an XPath expression is syntactically incorrect."""
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	274
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	275 def __init__(self, message, filename=None, lineno=-1, offset=-1):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	276 if filename:
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	277 message = '%s (%s, line %d)' % (message, filename, lineno)
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	278 Exception.__init__(self, message)
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	279 self.filename = filename
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	280 self.lineno = lineno
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	281 self.offset = offset
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	282
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	283
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	284 class PathParser(object):
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	285 """Tokenizes and parses an XPath expression."""
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	286
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	287 _QUOTES = (("'", "'"), ('"', '"'))
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	288 _TOKENS = ('::', ':', '..', '.', '//', '/', '[', ']', '()', '(', ')', '@',
179 13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	289 '=', '!=', '!', '\|', ',', '>=', '>', '<=', '<', '$')
163 9c023c395e44 Support for XPath number literals including decimal places. cmlenz parents: 162 diff changeset	290 _tokenize = re.compile('("[^"]")\|(\'[^\']\')\|((?:\d+)?\.\d+)\|(%s)\|([^%s\s]+)\|\s+' % (
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	291 '\|'.join([re.escape(t) for t in _TOKENS]),
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	292 ''.join([re.escape(t[0]) for t in _TOKENS]))).findall
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	293
139 8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	294 def __init__(self, text, filename=None, lineno=-1):
8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	295 self.filename = filename
8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	296 self.lineno = lineno
163 9c023c395e44 Support for XPath number literals including decimal places. cmlenz parents: 162 diff changeset	297 self.tokens = filter(None, [dqstr or sqstr or number or token or name
9c023c395e44 Support for XPath number literals including decimal places. cmlenz parents: 162 diff changeset	298 for dqstr, sqstr, number, token, name in
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	299 self._tokenize(text)])
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	300 self.pos = 0
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	301
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	302 # Tokenizer
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	303
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	304 at_end = property(lambda self: self.pos == len(self.tokens) - 1)
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	305 cur_token = property(lambda self: self.tokens[self.pos])
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	306
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	307 def next_token(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	308 self.pos += 1
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	309 return self.tokens[self.pos]
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	310
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	311 def peek_token(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	312 if not self.at_end:
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	313 return self.tokens[self.pos + 1]
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	314 return None
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	315
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	316 # Recursive descent parser
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	317
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	318 def parse(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	319 """Parses the XPath expression and returns a list of location path
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	320 tests.
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	321
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	322 For union expressions (such as `*\|text()`), this function returns one
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	323 test for each operand in the union. For patch expressions that don't
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	324 use the union operator, the function always returns a list of size 1.
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	325
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	326 Each path test in turn is a sequence of tests that correspond to the
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	327 location steps, each tuples of the form `(axis, testfunc, predicates)`
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	328 """
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	329 paths = [self._location_path()]
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	330 while self.cur_token == '\|':
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	331 self.next_token()
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	332 paths.append(self._location_path())
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	333 if not self.at_end:
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	334 raise PathSyntaxError('Unexpected token %r after end of expression'
139 8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	335 % self.cur_token, self.filename, self.lineno)
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	336 return paths
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	337
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	338 def _location_path(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	339 steps = []
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	340 while True:
215 94120e6b0ce4 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	341 if self.cur_token.startswith('/'):
94120e6b0ce4 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	342 if self.cur_token == '//':
94120e6b0ce4 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	343 steps.append((DESCENDANT_OR_SELF, NodeTest(), []))
94120e6b0ce4 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	344 elif not steps:
94120e6b0ce4 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	345 raise PathSyntaxError('Absolute location paths not '
94120e6b0ce4 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	346 'supported', self.filename,
94120e6b0ce4 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	347 self.lineno)
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	348 self.next_token()
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	349
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	350 axis, nodetest, predicates = self._location_step()
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	351 if not axis:
145 47bbd9d2a5af * Fix error in expression evaluation when the expression evaluates to an iterable that does not produce event tuples. cmlenz parents: 139 diff changeset	352 axis = CHILD
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	353 steps.append((axis, nodetest, predicates))
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	354
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	355 if self.at_end or not self.cur_token.startswith('/'):
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	356 break
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	357
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	358 return steps
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	359
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	360 def _location_step(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	361 if self.cur_token == '@':
114 4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	362 axis = ATTRIBUTE
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	363 self.next_token()
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	364 elif self.cur_token == '.':
114 4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	365 axis = SELF
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	366 elif self.cur_token == '..':
139 8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	367 raise PathSyntaxError('Unsupported axis "parent"', self.filename,
8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	368 self.lineno)
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	369 elif self.peek_token() == '::':
114 4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	370 axis = Axis.forname(self.cur_token)
4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	371 if axis is None:
139 8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	372 raise PathSyntaxError('Unsupport axis "%s"' % axis,
8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	373 self.filename, self.lineno)
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	374 self.next_token()
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	375 self.next_token()
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	376 else:
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	377 axis = None
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	378 nodetest = self._node_test(axis or CHILD)
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	379 predicates = []
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	380 while self.cur_token == '[':
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	381 predicates.append(self._predicate())
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	382 return axis, nodetest, predicates
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	383
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	384 def _node_test(self, axis=None):
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	385 test = prefix = None
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	386 next_token = self.peek_token()
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	387 if next_token in ('(', '()'): # Node type test
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	388 test = self._node_type()
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	389
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	390 elif next_token == ':': # Namespace prefix
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	391 prefix = self.cur_token
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	392 self.next_token()
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	393 localname = self.next_token()
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	394 if localname == '*':
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	395 test = QualifiedPrincipalTypeTest(axis, prefix)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	396 else:
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	397 test = QualifiedNameTest(axis, prefix, localname)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	398
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	399 else: # Name test
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	400 if self.cur_token == '*':
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	401 test = PrincipalTypeTest(axis)
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	402 elif self.cur_token == '.':
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	403 test = NodeTest()
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	404 else:
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	405 test = LocalNameTest(axis, self.cur_token)
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	406
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	407 if not self.at_end:
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	408 self.next_token()
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	409 return test
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	410
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	411 def _node_type(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	412 name = self.cur_token
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	413 self.next_token()
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	414
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	415 args = []
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	416 if self.cur_token != '()':
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	417 # The processing-instruction() function optionally accepts the
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	418 # name of the PI as argument, which must be a literal string
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	419 self.next_token() # (
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	420 if self.cur_token != ')':
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	421 string = self.cur_token
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	422 if (string[0], string[-1]) in self._QUOTES:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	423 string = string[1:-1]
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	424 args.append(string)
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	425
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	426 cls = _nodetest_map.get(name)
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	427 if not cls:
139 8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	428 raise PathSyntaxError('%s() not allowed here' % name, self.filename,
8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	429 self.lineno)
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	430 return cls(*args)
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	431
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	432 def _predicate(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	433 assert self.cur_token == '['
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	434 self.next_token()
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	435 expr = self._or_expr()
121 062e51ad7b19 Added support for the XPath functions `name()`, `namespace-uri()`, `local-name()`, and `not()`. cmlenz parents: 114 diff changeset	436 if self.cur_token != ']':
062e51ad7b19 Added support for the XPath functions `name()`, `namespace-uri()`, `local-name()`, and `not()`. cmlenz parents: 114 diff changeset	437 raise PathSyntaxError('Expected "]" to close predicate, '
139 8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	438 'but found "%s"' % self.cur_token,
8332287b5508 Implement position reporting for XPath syntax errors. Closes #20. cmlenz parents: 137 diff changeset	439 self.filename, self.lineno)
111 2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	440 if not self.at_end:
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	441 self.next_token()
2368c3becc52 Some fixes and more unit tests for the XPath engine. cmlenz parents: 106 diff changeset	442 return expr
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	443
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	444 def _or_expr(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	445 expr = self._and_expr()
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	446 while self.cur_token == 'or':
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	447 self.next_token()
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	448 expr = OrOperator(expr, self._and_expr())
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	449 return expr
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	450
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	451 def _and_expr(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	452 expr = self._equality_expr()
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	453 while self.cur_token == 'and':
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	454 self.next_token()
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	455 expr = AndOperator(expr, self._equality_expr())
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	456 return expr
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	457
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	458 def _equality_expr(self):
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	459 expr = self._relational_expr()
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	460 while self.cur_token in ('=', '!='):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	461 op = _operator_map[self.cur_token]
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	462 self.next_token()
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	463 expr = op(expr, self._relational_expr())
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	464 return expr
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	465
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	466 def _relational_expr(self):
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	467 expr = self._primary_expr()
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	468 while self.cur_token in ('>', '>=', '<', '>='):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	469 op = _operator_map[self.cur_token]
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	470 self.next_token()
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	471 expr = op(expr, self._primary_expr())
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	472 return expr
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	473
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	474 def _primary_expr(self):
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	475 token = self.cur_token
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	476 if len(token) > 1 and (token[0], token[-1]) in self._QUOTES:
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	477 self.next_token()
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	478 return StringLiteral(token[1:-1])
163 9c023c395e44 Support for XPath number literals including decimal places. cmlenz parents: 162 diff changeset	479 elif token[0].isdigit() or token[0] == '.':
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	480 self.next_token()
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	481 return NumberLiteral(float(token))
179 13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	482 elif token == '$':
13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	483 token = self.next_token()
13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	484 self.next_token()
13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	485 return VariableReference(token)
121 062e51ad7b19 Added support for the XPath functions `name()`, `namespace-uri()`, `local-name()`, and `not()`. cmlenz parents: 114 diff changeset	486 elif not self.at_end and self.peek_token().startswith('('):
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	487 return self._function_call()
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	488 else:
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	489 axis = None
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	490 if token == '@':
114 4c4e81d12649 Use constants for axes in XPath engine. cmlenz parents: 111 diff changeset	491 axis = ATTRIBUTE
106 f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	492 self.next_token()
f9473bdc93b2 Complete rewrite of the XPath parsing, which was a mess before. Closes #19. cmlenz parents: 77 diff changeset	493 return self._node_test(axis)
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	494
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	495 def _function_call(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	496 name = self.cur_token
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	497 if self.next_token() == '()':
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	498 args = []
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	499 else:
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	500 assert self.cur_token == '('
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	501 self.next_token()
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	502 args = [self._or_expr()]
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	503 while self.cur_token == ',':
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	504 self.next_token()
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	505 args.append(self._or_expr())
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	506 if not self.cur_token == ')':
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	507 raise PathSyntaxError('Expected ")" to close function argument '
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	508 'list, but found "%s"' % self.cur_token,
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	509 self.filename, self.lineno)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	510 self.next_token()
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	511 cls = _function_map.get(name)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	512 if not cls:
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	513 raise PathSyntaxError('Unsupported function "%s"' % name,
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	514 self.filename, self.lineno)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	515 return cls(*args)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	516
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	517
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	518 # Node tests
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	519
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	520 class PrincipalTypeTest(object):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	521 """Node test that matches any event with the given principal type."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	522 __slots__ = ['principal_type']
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	523 def __init__(self, principal_type):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	524 self.principal_type = principal_type
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	525 def __call__(self, kind, data, pos, namespaces, variables):
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	526 if kind is START:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	527 if self.principal_type is ATTRIBUTE:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	528 return data[1] or None
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	529 else:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	530 return True
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	531 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	532 return '*'
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	533
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	534 class QualifiedPrincipalTypeTest(object):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	535 """Node test that matches any event with the given principal type in a
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	536 specific namespace."""
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	537 __slots__ = ['principal_type', 'prefix']
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	538 def __init__(self, principal_type, prefix):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	539 self.principal_type = principal_type
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	540 self.prefix = prefix
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	541 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	542 namespace = Namespace(namespaces.get(self.prefix))
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	543 if kind is START:
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	544 if self.principal_type is ATTRIBUTE and data[1]:
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	545 return Attrs([(name, value) for name, value in data[1]
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	546 if name in namespace]) or None
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	547 else:
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	548 return data[0] in namespace
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	549 def __repr__(self):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	550 return '%s:*' % self.prefix
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	551
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	552 class LocalNameTest(object):
364 7dabedbb53fb Fix for #77: match templates were matching their own output. cmlenz parents: 363 diff changeset	553 """Node test that matches any event with the given principal type and
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	554 local name.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	555 """
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	556 __slots__ = ['principal_type', 'name']
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	557 def __init__(self, principal_type, name):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	558 self.principal_type = principal_type
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	559 self.name = name
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	560 def __call__(self, kind, data, pos, namespaces, variables):
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	561 if kind is START:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	562 if self.principal_type is ATTRIBUTE and self.name in data[1]:
234 39c424b80edd * Minor simplification of XPath engine. cmlenz parents: 230 diff changeset	563 return data[1].get(self.name)
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	564 else:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	565 return data[0].localname == self.name
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	566 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	567 return self.name
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	568
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	569 class QualifiedNameTest(object):
364 7dabedbb53fb Fix for #77: match templates were matching their own output. cmlenz parents: 363 diff changeset	570 """Node test that matches any event with the given principal type and
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	571 qualified name.
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	572 """
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	573 __slots__ = ['principal_type', 'prefix', 'name']
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	574 def __init__(self, principal_type, prefix, name):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	575 self.principal_type = principal_type
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	576 self.prefix = prefix
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	577 self.name = name
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	578 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	579 qname = QName('%s}%s' % (namespaces.get(self.prefix), self.name))
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	580 if kind is START:
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	581 if self.principal_type is ATTRIBUTE and qname in data[1]:
234 39c424b80edd * Minor simplification of XPath engine. cmlenz parents: 230 diff changeset	582 return data[1].get(qname)
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	583 else:
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	584 return data[0] == qname
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	585 def __repr__(self):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	586 return '%s:%s' % (self.prefix, self.name)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	587
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	588 class CommentNodeTest(object):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	589 """Node test that matches any comment events."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	590 __slots__ = []
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	591 def __call__(self, kind, data, pos, namespaces, variables):
330 3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	592 return kind is COMMENT
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	593 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	594 return 'comment()'
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	595
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	596 class NodeTest(object):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	597 """Node test that matches any node."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	598 __slots__ = []
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	599 def __call__(self, kind, data, pos, namespaces, variables):
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	600 if kind is START:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	601 return True
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	602 return kind, data, pos
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	603 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	604 return 'node()'
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	605
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	606 class ProcessingInstructionNodeTest(object):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	607 """Node test that matches any processing instruction event."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	608 __slots__ = ['target']
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	609 def __init__(self, target=None):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	610 self.target = target
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	611 def __call__(self, kind, data, pos, namespaces, variables):
330 3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	612 return kind is PI and (not self.target or data[0] == self.target)
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	613 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	614 arg = ''
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	615 if self.target:
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	616 arg = '"' + self.target + '"'
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	617 return 'processing-instruction(%s)' % arg
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	618
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	619 class TextNodeTest(object):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	620 """Node test that matches any text event."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	621 __slots__ = []
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	622 def __call__(self, kind, data, pos, namespaces, variables):
330 3e749eaa3100 XPath tests should never return event tuples, just values or booleans. cmlenz parents: 326 diff changeset	623 return kind is TEXT
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	624 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	625 return 'text()'
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	626
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	627 _nodetest_map = {'comment': CommentNodeTest, 'node': NodeTest,
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	628 'processing-instruction': ProcessingInstructionNodeTest,
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	629 'text': TextNodeTest}
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	630
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	631 # Functions
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	632
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	633 class Function(object):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	634 """Base class for function nodes in XPath expressions."""
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	635
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	636 class BooleanFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	637 """The `boolean` function, which converts its argument to a boolean
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	638 value.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	639 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	640 __slots__ = ['expr']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	641 def __init__(self, expr):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	642 self.expr = expr
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	643 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	644 val = self.expr(kind, data, pos, namespaces, variables)
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	645 return bool(val)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	646 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	647 return 'boolean(%r)' % self.expr
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	648
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	649 class CeilingFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	650 """The `ceiling` function, which returns the nearest lower integer number
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	651 for the given number.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	652 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	653 __slots__ = ['number']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	654 def __init__(self, number):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	655 self.number = number
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	656 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	657 number = self.number(kind, data, pos, namespaces, variables)
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	658 return ceil(float(number))
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	659 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	660 return 'ceiling(%r)' % self.number
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	661
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	662 class ConcatFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	663 """The `concat` function, which concatenates (joins) the variable number of
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	664 strings it gets as arguments.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	665 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	666 __slots__ = ['exprs']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	667 def __init__(self, *exprs):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	668 self.exprs = exprs
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	669 def __call__(self, kind, data, pos, namespaces, variables):
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	670 strings = []
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	671 for item in [expr(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	672 for expr in self.exprs]:
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	673 strings.append(item)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	674 return u''.join(strings)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	675 def __repr__(self):
169 dc6676d3b697 Fix syntax error in `path` module. cmlenz parents: 164 diff changeset	676 return 'concat(%s)' % ', '.join([repr(expr) for expr in self.exprs])
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	677
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	678 class ContainsFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	679 """The `contains` function, which returns whether a string contains a given
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	680 substring.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	681 """
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	682 __slots__ = ['string1', 'string2']
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	683 def __init__(self, string1, string2):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	684 self.string1 = string1
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	685 self.string2 = string2
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	686 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	687 string1 = self.string1(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	688 string2 = self.string2(kind, data, pos, namespaces, variables)
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	689 return string2 in string1
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	690 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	691 return 'contains(%r, %r)' % (self.string1, self.string2)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	692
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	693 class FalseFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	694 """The `false` function, which always returns the boolean `false` value."""
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	695 __slots__ = []
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	696 def __call__(self, kind, data, pos, namespaces, variables):
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	697 return False
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	698 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	699 return 'false()'
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	700
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	701 class FloorFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	702 """The `ceiling` function, which returns the nearest higher integer number
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	703 for the given number.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	704 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	705 __slots__ = ['number']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	706 def __init__(self, number):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	707 self.number = number
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	708 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	709 number = self.number(kind, data, pos, namespaces, variables)
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	710 return floor(float(number))
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	711 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	712 return 'floor(%r)' % self.number
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	713
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	714 class LocalNameFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	715 """The `local-name` function, which returns the local name of the current
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	716 element.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	717 """
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	718 __slots__ = []
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	719 def __call__(self, kind, data, pos, namespaces, variables):
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	720 if kind is START:
234 39c424b80edd * Minor simplification of XPath engine. cmlenz parents: 230 diff changeset	721 return data[0].localname
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	722 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	723 return 'local-name()'
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	724
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	725 class NameFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	726 """The `name` function, which returns the qualified name of the current
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	727 element.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	728 """
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	729 __slots__ = []
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	730 def __call__(self, kind, data, pos, namespaces, variables):
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	731 if kind is START:
234 39c424b80edd * Minor simplification of XPath engine. cmlenz parents: 230 diff changeset	732 return data[0]
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	733 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	734 return 'name()'
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	735
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	736 class NamespaceUriFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	737 """The `namespace-uri` function, which returns the namespace URI of the
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	738 current element.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	739 """
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	740 __slots__ = []
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	741 def __call__(self, kind, data, pos, namespaces, variables):
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	742 if kind is START:
234 39c424b80edd * Minor simplification of XPath engine. cmlenz parents: 230 diff changeset	743 return data[0].namespace
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	744 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	745 return 'namespace-uri()'
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	746
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	747 class NotFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	748 """The `not` function, which returns the negated boolean value of its
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	749 argument.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	750 """
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	751 __slots__ = ['expr']
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	752 def __init__(self, expr):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	753 self.expr = expr
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	754 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	755 return not self.expr(kind, data, pos, namespaces, variables)
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	756 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	757 return 'not(%s)' % self.expr
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	758
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	759 class NormalizeSpaceFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	760 """The `normalize-space` function, which removes leading and trailing
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	761 whitespace in the given string, and replaces multiple adjacent whitespace
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	762 characters inside the string with a single space.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	763 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	764 __slots__ = ['expr']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	765 _normalize = re.compile(r'\s{2,}').sub
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	766 def __init__(self, expr):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	767 self.expr = expr
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	768 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	769 string = self.expr(kind, data, pos, namespaces, variables)
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	770 return self._normalize(' ', string.strip())
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	771 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	772 return 'normalize-space(%s)' % repr(self.expr)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	773
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	774 class NumberFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	775 """The `number` function that converts its argument to a number."""
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	776 __slots__ = ['expr']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	777 def __init__(self, expr):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	778 self.expr = expr
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	779 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	780 val = self.expr(kind, data, pos, namespaces, variables)
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	781 return float(val)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	782 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	783 return 'number(%r)' % self.expr
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	784
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	785 class RoundFunction(Function):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	786 """The `round` function, which returns the nearest integer number for the
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	787 given number.
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	788 """
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	789 __slots__ = ['number']
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	790 def __init__(self, number):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	791 self.number = number
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	792 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	793 number = self.number(kind, data, pos, namespaces, variables)
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	794 return round(float(number))
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	795 def __repr__(self):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	796 return 'round(%r)' % self.number
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	797
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	798 class StartsWithFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	799 """The `starts-with` function that returns whether one string starts with
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	800 a given substring.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	801 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	802 __slots__ = ['string1', 'string2']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	803 def __init__(self, string1, string2):
282 24b3cbbc1b1b Fix `starts-with()` XPath function so that it actually compares the two strings. Closes #61. cmlenz parents: 259 diff changeset	804 self.string1 = string1
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	805 self.string2 = string2
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	806 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	807 string1 = self.string1(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	808 string2 = self.string2(kind, data, pos, namespaces, variables)
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	809 return string1.startswith(string2)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	810 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	811 return 'starts-with(%r, %r)' % (self.string1, self.string2)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	812
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	813 class StringLengthFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	814 """The `string-length` function that returns the length of the given
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	815 string.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	816 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	817 __slots__ = ['expr']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	818 def __init__(self, expr):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	819 self.expr = expr
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	820 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	821 string = self.expr(kind, data, pos, namespaces, variables)
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	822 return len(string)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	823 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	824 return 'string-length(%r)' % self.expr
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	825
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	826 class SubstringFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	827 """The `substring` function that returns the part of a string that starts
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	828 at the given offset, and optionally limited to the given length.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	829 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	830 __slots__ = ['string', 'start', 'length']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	831 def __init__(self, string, start, length=None):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	832 self.string = string
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	833 self.start = start
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	834 self.length = length
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	835 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	836 string = self.string(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	837 start = self.start(kind, data, pos, namespaces, variables)
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	838 length = 0
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	839 if self.length is not None:
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	840 length = self.length(kind, data, pos, namespaces, variables)
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	841 return string[int(start):len(string) - int(length)]
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	842 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	843 if self.length is not None:
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	844 return 'substring(%r, %r, %r)' % (self.string, self.start,
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	845 self.length)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	846 else:
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	847 return 'substring(%r, %r)' % (self.string, self.start)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	848
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	849 class SubstringAfterFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	850 """The `substring-after` function that returns the part of a string that
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	851 is found after the given substring.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	852 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	853 __slots__ = ['string1', 'string2']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	854 def __init__(self, string1, string2):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	855 self.string1 = string1
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	856 self.string2 = string2
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	857 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	858 string1 = self.string1(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	859 string2 = self.string2(kind, data, pos, namespaces, variables)
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	860 index = string1.find(string2)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	861 if index >= 0:
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	862 return string1[index + len(string2):]
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	863 return u''
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	864 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	865 return 'substring-after(%r, %r)' % (self.string1, self.string2)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	866
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	867 class SubstringBeforeFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	868 """The `substring-before` function that returns the part of a string that
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	869 is found before the given substring.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	870 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	871 __slots__ = ['string1', 'string2']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	872 def __init__(self, string1, string2):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	873 self.string1 = string1
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	874 self.string2 = string2
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	875 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	876 string1 = self.string1(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	877 string2 = self.string2(kind, data, pos, namespaces, variables)
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	878 index = string1.find(string2)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	879 if index >= 0:
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	880 return string1[:index]
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	881 return u''
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	882 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	883 return 'substring-after(%r, %r)' % (self.string1, self.string2)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	884
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	885 class TranslateFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	886 """The `translate` function that translates a set of characters in a
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	887 string to target set of characters.
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	888 """
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	889 __slots__ = ['string', 'fromchars', 'tochars']
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	890 def __init__(self, string, fromchars, tochars):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	891 self.string = string
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	892 self.fromchars = fromchars
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	893 self.tochars = tochars
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	894 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	895 string = self.string(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	896 fromchars = self.fromchars(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	897 tochars = self.tochars(kind, data, pos, namespaces, variables)
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	898 table = dict(zip([ord(c) for c in fromchars],
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	899 [ord(c) for c in tochars]))
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	900 return string.translate(table)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	901 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	902 return 'translate(%r, %r, %r)' % (self.string, self.fromchars,
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	903 self.tochars)
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	904
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	905 class TrueFunction(Function):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	906 """The `true` function, which always returns the boolean `true` value."""
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	907 __slots__ = []
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	908 def __call__(self, kind, data, pos, namespaces, variables):
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	909 return True
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	910 def __repr__(self):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	911 return 'true()'
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	912
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	913 _function_map = {'boolean': BooleanFunction, 'ceiling': CeilingFunction,
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	914 'concat': ConcatFunction, 'contains': ContainsFunction,
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	915 'false': FalseFunction, 'floor': FloorFunction,
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	916 'local-name': LocalNameFunction, 'name': NameFunction,
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	917 'namespace-uri': NamespaceUriFunction,
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	918 'normalize-space': NormalizeSpaceFunction, 'not': NotFunction,
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	919 'number': NumberFunction, 'round': RoundFunction,
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	920 'starts-with': StartsWithFunction,
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	921 'string-length': StringLengthFunction,
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	922 'substring': SubstringFunction,
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	923 'substring-after': SubstringAfterFunction,
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	924 'substring-before': SubstringBeforeFunction,
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	925 'translate': TranslateFunction, 'true': TrueFunction}
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	926
179 13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	927 # Literals & Variables
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	928
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	929 class Literal(object):
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	930 """Abstract base class for literal nodes."""
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	931
9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	932 class StringLiteral(Literal):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	933 """A string literal node."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	934 __slots__ = ['text']
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	935 def __init__(self, text):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	936 self.text = text
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	937 def __call__(self, kind, data, pos, namespaces, variables):
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	938 return self.text
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	939 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	940 return '"%s"' % self.text
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	941
155 9a5aedda1099 * String literals in XPath expressions that contains spaces are now tokenizes correctly. cmlenz parents: 145 diff changeset	942 class NumberLiteral(Literal):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	943 """A number literal node."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	944 __slots__ = ['number']
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	945 def __init__(self, number):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	946 self.number = number
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	947 def __call__(self, kind, data, pos, namespaces, variables):
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	948 return self.number
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	949 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	950 return str(self.number)
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	951
179 13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	952 class VariableReference(Literal):
13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	953 """A variable reference node."""
13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	954 __slots__ = ['name']
13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	955 def __init__(self, name):
13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	956 self.name = name
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	957 def __call__(self, kind, data, pos, namespaces, variables):
228 a5b38b459cbb Add support for position predicates in XPath expressions. cmlenz parents: 224 diff changeset	958 return variables.get(self.name)
179 13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	959 def __repr__(self):
215 94120e6b0ce4 A couple of minor XPath fixes. cmlenz parents: 211 diff changeset	960 return str(self.name)
179 13909179e5e1 Implemented support for XPath variables in predicates (#31). cmlenz parents: 169 diff changeset	961
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	962 # Operators
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	963
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	964 class AndOperator(object):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	965 """The boolean operator `and`."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	966 __slots__ = ['lval', 'rval']
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	967 def __init__(self, lval, rval):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	968 self.lval = lval
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	969 self.rval = rval
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	970 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	971 lval = self.lval(kind, data, pos, namespaces, variables)
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	972 if not lval:
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	973 return False
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	974 rval = self.rval(kind, data, pos, namespaces, variables)
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	975 return bool(rval)
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	976 def __repr__(self):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	977 return '%s and %s' % (self.lval, self.rval)
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	978
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	979 class EqualsOperator(object):
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	980 """The equality operator `=`."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	981 __slots__ = ['lval', 'rval']
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	982 def __init__(self, lval, rval):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	983 self.lval = lval
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	984 self.rval = rval
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	985 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	986 lval = self.lval(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	987 rval = self.rval(kind, data, pos, namespaces, variables)
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	988 return lval == rval
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	989 def __repr__(self):
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	990 return '%s=%s' % (self.lval, self.rval)
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	991
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	992 class NotEqualsOperator(object):
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	993 """The equality operator `!=`."""
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	994 __slots__ = ['lval', 'rval']
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	995 def __init__(self, lval, rval):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	996 self.lval = lval
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	997 self.rval = rval
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	998 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	999 lval = self.lval(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1000 rval = self.rval(kind, data, pos, namespaces, variables)
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1001 return lval != rval
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1002 def __repr__(self):
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1003 return '%s!=%s' % (self.lval, self.rval)
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1004
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1005 class OrOperator(object):
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1006 """The boolean operator `or`."""
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1007 __slots__ = ['lval', 'rval']
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1008 def __init__(self, lval, rval):
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1009 self.lval = lval
7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1010 self.rval = rval
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1011 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1012 lval = self.lval(kind, data, pos, namespaces, variables)
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1013 if lval:
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1014 return True
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1015 rval = self.rval(kind, data, pos, namespaces, variables)
161 7b1f07496bf7 Various docstring additions and other cosmetic changes. cmlenz parents: 156 diff changeset	1016 return bool(rval)
137 ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1017 def __repr__(self):
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1018 return '%s or %s' % (self.lval, self.rval)
ac0bc4a6aeba Further cleanup of XPath engine. cmlenz parents: 122 diff changeset	1019
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1020 class GreaterThanOperator(object):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1021 """The relational operator `>` (greater than)."""
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1022 __slots__ = ['lval', 'rval']
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1023 def __init__(self, lval, rval):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1024 self.lval = lval
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1025 self.rval = rval
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1026 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1027 lval = self.lval(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1028 rval = self.rval(kind, data, pos, namespaces, variables)
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1029 return float(lval) > float(rval)
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1030 def __repr__(self):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1031 return '%s>%s' % (self.lval, self.rval)
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1032
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1033 class GreaterThanOrEqualOperator(object):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1034 """The relational operator `>=` (greater than or equal)."""
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1035 __slots__ = ['lval', 'rval']
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1036 def __init__(self, lval, rval):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1037 self.lval = lval
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1038 self.rval = rval
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1039 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1040 lval = self.lval(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1041 rval = self.rval(kind, data, pos, namespaces, variables)
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1042 return float(lval) >= float(rval)
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1043 def __repr__(self):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1044 return '%s>=%s' % (self.lval, self.rval)
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1045
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1046 class LessThanOperator(object):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1047 """The relational operator `<` (less than)."""
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1048 __slots__ = ['lval', 'rval']
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1049 def __init__(self, lval, rval):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1050 self.lval = lval
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1051 self.rval = rval
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1052 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1053 lval = self.lval(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1054 rval = self.rval(kind, data, pos, namespaces, variables)
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1055 return float(lval) < float(rval)
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1056 def __repr__(self):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1057 return '%s<%s' % (self.lval, self.rval)
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1058
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1059 class LessThanOrEqualOperator(object):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1060 """The relational operator `<=` (less than or equal)."""
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1061 __slots__ = ['lval', 'rval']
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1062 def __init__(self, lval, rval):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1063 self.lval = lval
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1064 self.rval = rval
224 90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1065 def __call__(self, kind, data, pos, namespaces, variables):
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1066 lval = self.lval(kind, data, pos, namespaces, variables)
90d62225f411 Implement support for namespace prefixes in XPath expressions. cmlenz parents: 223 diff changeset	1067 rval = self.rval(kind, data, pos, namespaces, variables)
162 456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1068 return float(lval) <= float(rval)
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1069 def __repr__(self):
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1070 return '%s<=%s' % (self.lval, self.rval)
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1071
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1072 _operator_map = {'=': EqualsOperator, '!=': NotEqualsOperator,
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1073 '>': GreaterThanOperator, '>=': GreaterThanOrEqualOperator,
456039594db9 Implement the XPath relational operators and the `round()` function. cmlenz parents: 161 diff changeset	1074 '<': LessThanOperator, '>=': LessThanOrEqualOperator}
333 e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	1075
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	1076
e5ba8c5a30fe Fix XPath traversal in match templates. Previously, `div/p` would be treated the same as `div//p`, i.e. it would match all descendants and not just the immediate children. cmlenz parents: 330 diff changeset	1077 _DOTSLASHSLASH = (DESCENDANT_OR_SELF, PrincipalTypeTest(None), ())

Mercurial > genshi > mirror

annotate genshi/path.py @ 384:5b6e4335ee21 trunk