Mercurial > genshi > genshi-test
annotate genshi/path.py @ 330:1dbeaef463e7
XPath tests should never return event tuples, just values or booleans.
author | cmlenz |
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date | Mon, 06 Nov 2006 18:28:23 +0000 |
parents | 08ada6b4b767 |
children | b70563ade748 |
rev | line source |
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1 | 1 # -*- coding: utf-8 -*- |
2 # | |
66
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Switch copyright to Edgewall and URLs to markup.edgewall.org.
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3 # Copyright (C) 2006 Edgewall Software |
1 | 4 # All rights reserved. |
5 # | |
6 # This software is licensed as described in the file COPYING, which | |
7 # you should have received as part of this distribution. The terms | |
230 | 8 # are also available at http://genshi.edgewall.org/wiki/License. |
1 | 9 # |
10 # This software consists of voluntary contributions made by many | |
11 # individuals. For the exact contribution history, see the revision | |
230 | 12 # history and logs, available at http://genshi.edgewall.org/log/. |
1 | 13 |
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14 """Basic support for evaluating XPath expressions against streams. |
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15 |
230 | 16 >>> from genshi.input import XML |
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17 >>> doc = XML('''<doc> |
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18 ... <items count="2"> |
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19 ... <item status="new"> |
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20 ... <summary>Foo</summary> |
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21 ... </item> |
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22 ... <item status="closed"> |
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23 ... <summary>Bar</summary> |
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24 ... </item> |
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25 ... </items> |
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26 ... </doc>''') |
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27 >>> print doc.select('items/item[@status="closed"]/summary/text()') |
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28 Bar |
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29 |
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30 Because the XPath engine operates on markup streams (as opposed to tree |
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31 structures), it only implements a subset of the full XPath 1.0 language. |
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32 """ |
1 | 33 |
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34 from math import ceil, floor |
1 | 35 import re |
36 | |
230 | 37 from genshi.core import Stream, Attrs, Namespace, QName |
38 from genshi.core import START, END, TEXT, COMMENT, PI | |
1 | 39 |
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40 __all__ = ['Path', 'PathSyntaxError'] |
1 | 41 |
42 | |
114 | 43 class Axis(object): |
44 """Defines constants for the various supported XPath axes.""" | |
45 | |
46 ATTRIBUTE = 'attribute' | |
47 CHILD = 'child' | |
48 DESCENDANT = 'descendant' | |
49 DESCENDANT_OR_SELF = 'descendant-or-self' | |
50 SELF = 'self' | |
51 | |
52 def forname(cls, name): | |
53 """Return the axis constant for the given name, or `None` if no such | |
54 axis was defined. | |
55 """ | |
56 return getattr(cls, name.upper().replace('-', '_'), None) | |
57 forname = classmethod(forname) | |
58 | |
59 | |
60 ATTRIBUTE = Axis.ATTRIBUTE | |
61 CHILD = Axis.CHILD | |
62 DESCENDANT = Axis.DESCENDANT | |
63 DESCENDANT_OR_SELF = Axis.DESCENDANT_OR_SELF | |
64 SELF = Axis.SELF | |
65 | |
66 | |
1 | 67 class Path(object): |
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68 """Implements basic XPath support on streams. |
1 | 69 |
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70 Instances of this class represent a "compiled" XPath expression, and provide |
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71 methods for testing the path against a stream, as well as extracting a |
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72 substream matching that path. |
1 | 73 """ |
74 | |
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75 def __init__(self, text, filename=None, lineno=-1): |
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76 """Create the path object from a string. |
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77 |
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78 @param text: the path expression |
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79 """ |
1 | 80 self.source = text |
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81 self.paths = PathParser(text, filename, lineno).parse() |
1 | 82 |
83 def __repr__(self): | |
137 | 84 paths = [] |
85 for path in self.paths: | |
86 steps = [] | |
87 for axis, nodetest, predicates in path: | |
88 steps.append('%s::%s' % (axis, nodetest)) | |
89 for predicate in predicates: | |
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90 steps[-1] += '[%s]' % predicate |
137 | 91 paths.append('/'.join(steps)) |
92 return '<%s "%s">' % (self.__class__.__name__, '|'.join(paths)) | |
1 | 93 |
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94 def select(self, stream, namespaces=None, variables=None): |
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95 """Returns a substream of the given stream that matches the path. |
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96 |
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97 If there are no matches, this method returns an empty stream. |
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98 |
230 | 99 >>> from genshi.input import XML |
33 | 100 >>> xml = XML('<root><elem><child>Text</child></elem></root>') |
61 | 101 |
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102 >>> print Path('.//child').select(xml) |
33 | 103 <child>Text</child> |
104 | |
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105 >>> print Path('.//child/text()').select(xml) |
33 | 106 Text |
107 | |
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108 @param stream: the stream to select from |
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109 @param namespaces: (optional) a mapping of namespace prefixes to URIs |
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110 @param variables: (optional) a mapping of variable names to values |
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111 @return: the substream matching the path, or an empty stream |
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112 """ |
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113 if namespaces is None: |
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114 namespaces = {} |
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115 if variables is None: |
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116 variables = {} |
1 | 117 stream = iter(stream) |
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118 def _generate(): |
1 | 119 test = self.test() |
305 | 120 for event in stream: |
121 result = test(event, namespaces, variables) | |
1 | 122 if result is True: |
305 | 123 yield event |
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124 if event[0] is START: |
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125 depth = 1 |
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126 while depth > 0: |
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127 subevent = stream.next() |
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128 if subevent[0] is START: |
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129 depth += 1 |
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130 elif subevent[0] is END: |
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131 depth -= 1 |
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132 yield subevent |
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133 test(subevent, namespaces, variables, |
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134 updateonly=True) |
1 | 135 elif result: |
136 yield result | |
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137 return Stream(_generate()) |
1 | 138 |
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139 def test(self, ignore_context=False): |
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140 """Returns a function that can be used to track whether the path matches |
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141 a specific stream event. |
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142 |
305 | 143 The function returned expects the positional arguments `event`, |
144 `namespaces` and `variables`. The first is a stream event, while the | |
145 latter two are a mapping of namespace prefixes to URIs, and a mapping | |
306 | 146 of variable names to values, respectively. In addition, the function |
147 accepts an `updateonly` keyword argument that default to `False`. If | |
148 it is set to `True`, the function only updates its internal state, | |
149 but does not perform any tests or return a result. | |
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150 |
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151 If the path matches the event, the function returns the match (for |
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152 example, a `START` or `TEXT` event.) Otherwise, it returns `None`. |
33 | 153 |
230 | 154 >>> from genshi.input import XML |
33 | 155 >>> xml = XML('<root><elem><child id="1"/></elem><child id="2"/></root>') |
156 >>> test = Path('child').test() | |
305 | 157 >>> for event in xml: |
158 ... if test(event, {}, {}): | |
159 ... print event | |
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160 ('START', (QName(u'child'), Attrs([(QName(u'id'), u'2')])), (None, 1, 34)) |
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161 """ |
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162 paths = [(p, len(p), [0], [], [0] * len(p)) for p in self.paths] |
1 | 163 |
306 | 164 def _test(event, namespaces, variables, updateonly=False): |
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165 kind, data, pos = event[:3] |
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166 retval = None |
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167 for steps, size, cursors, cutoff, counter in paths: |
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168 # Manage the stack that tells us "where we are" in the stream |
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169 if kind is END: |
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170 if cursors: |
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171 cursors.pop() |
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172 continue |
223 | 173 elif kind is START: |
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174 cursors.append(cursors and cursors[-1] or 0) |
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175 |
306 | 176 if updateonly or retval or not cursors: |
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177 continue |
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178 cursor = cursors[-1] |
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179 depth = len(cursors) |
1 | 180 |
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181 if cutoff and depth + int(kind is not START) > cutoff[0]: |
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182 continue |
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183 |
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184 ctxtnode = not ignore_context and kind is START \ |
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185 and depth == 2 |
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186 matched = None |
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187 while 1: |
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188 # Fetch the next location step |
137 | 189 axis, nodetest, predicates = steps[cursor] |
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190 |
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191 # If this is the start event for the context node, and the |
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192 # axis of the location step doesn't include the current |
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193 # element, skip the test |
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194 if ctxtnode and (axis is CHILD or axis is DESCENDANT): |
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195 break |
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196 |
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197 # Is this the last step of the location path? |
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198 last_step = cursor + 1 == size |
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199 |
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200 # Perform the actual node test |
224
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201 matched = nodetest(kind, data, pos, namespaces, variables) |
216
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202 |
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203 # The node test matched |
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204 if matched: |
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205 |
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206 # Check all the predicates for this step |
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207 if predicates: |
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208 for predicate in predicates: |
228
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209 pretval = predicate(kind, data, pos, namespaces, |
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210 variables) |
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211 if type(pretval) is float: |
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212 counter[cursor] += 1 |
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213 if counter[cursor] != int(pretval): |
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214 pretval = False |
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215 if not pretval: |
216
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216 matched = None |
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217 break |
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218 |
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219 # Both the node test and the predicates matched |
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220 if matched: |
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221 if last_step: |
217
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222 if not ctxtnode or kind is not START \ |
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223 or axis is ATTRIBUTE or axis is SELF: |
216
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224 retval = matched |
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225 elif not ctxtnode or axis is SELF \ |
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226 or axis is DESCENDANT_OR_SELF: |
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227 cursor += 1 |
228
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228 cursors[-1] = cursor |
216
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229 cutoff[:] = [] |
228
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230 |
216
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231 elif not ignore_context and kind is START: |
228
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232 cutoff[:] = [depth] |
216
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233 |
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234 if last_step and not ignore_context and kind is START: |
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235 if (axis is not DESCENDANT and |
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236 axis is not DESCENDANT_OR_SELF): |
228
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237 cutoff[:] = [depth] |
216
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238 |
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239 if kind is START and not last_step: |
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240 next_axis = steps[cursor][0] |
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241 if next_axis is ATTRIBUTE: |
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242 # If the axis of the next location step is the |
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243 # attribute axis, we need to move on to processing |
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244 # that step without waiting for the next markup |
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245 # event |
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246 continue |
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247 |
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248 # We're done with this step if it's the last step or the |
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249 # axis isn't "self" |
217
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250 if last_step or (axis is not SELF and |
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251 axis is not DESCENDANT_OR_SELF): |
216
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252 break |
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253 |
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254 if kind is START and axis is not DESCENDANT \ |
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255 and axis is not DESCENDANT_OR_SELF: |
106
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256 # If this step is not a closure, it cannot be matched until |
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257 # the current element is closed... so we need to move the |
114 | 258 # cursor back to the previous closure and retest that |
259 # against the current element | |
215 | 260 backsteps = [(k, d, p) for k, d, p in steps[:cursor] |
261 if k is DESCENDANT or k is DESCENDANT_OR_SELF] | |
111
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262 backsteps.reverse() |
137 | 263 for axis, nodetest, predicates in backsteps: |
224
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264 matched = nodetest(kind, data, pos, namespaces, |
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265 variables) |
111
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266 if not matched: |
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267 cursor -= 1 |
216
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268 cutoff[:] = [] |
111
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269 break |
228
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270 cursors[-1] = cursor |
1 | 271 |
259
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272 return retval |
1 | 273 |
274 return _test | |
275 | |
276 | |
106
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277 class PathSyntaxError(Exception): |
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278 """Exception raised when an XPath expression is syntactically incorrect.""" |
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279 |
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280 def __init__(self, message, filename=None, lineno=-1, offset=-1): |
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281 if filename: |
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282 message = '%s (%s, line %d)' % (message, filename, lineno) |
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283 Exception.__init__(self, message) |
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284 self.filename = filename |
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285 self.lineno = lineno |
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286 self.offset = offset |
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287 |
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288 |
137 | 289 class PathParser(object): |
106
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290 """Tokenizes and parses an XPath expression.""" |
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291 |
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292 _QUOTES = (("'", "'"), ('"', '"')) |
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293 _TOKENS = ('::', ':', '..', '.', '//', '/', '[', ']', '()', '(', ')', '@', |
179
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294 '=', '!=', '!', '|', ',', '>=', '>', '<=', '<', '$') |
163
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295 _tokenize = re.compile('("[^"]*")|(\'[^\']*\')|((?:\d+)?\.\d+)|(%s)|([^%s\s]+)|\s+' % ( |
106
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296 '|'.join([re.escape(t) for t in _TOKENS]), |
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297 ''.join([re.escape(t[0]) for t in _TOKENS]))).findall |
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298 |
139
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299 def __init__(self, text, filename=None, lineno=-1): |
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300 self.filename = filename |
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301 self.lineno = lineno |
163
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302 self.tokens = filter(None, [dqstr or sqstr or number or token or name |
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303 for dqstr, sqstr, number, token, name in |
155
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304 self._tokenize(text)]) |
106
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305 self.pos = 0 |
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306 |
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307 # Tokenizer |
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308 |
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309 at_end = property(lambda self: self.pos == len(self.tokens) - 1) |
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310 cur_token = property(lambda self: self.tokens[self.pos]) |
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311 |
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312 def next_token(self): |
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313 self.pos += 1 |
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314 return self.tokens[self.pos] |
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315 |
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316 def peek_token(self): |
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317 if not self.at_end: |
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318 return self.tokens[self.pos + 1] |
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319 return None |
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320 |
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321 # Recursive descent parser |
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322 |
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323 def parse(self): |
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324 """Parses the XPath expression and returns a list of location path |
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325 tests. |
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326 |
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327 For union expressions (such as `*|text()`), this function returns one |
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328 test for each operand in the union. For patch expressions that don't |
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329 use the union operator, the function always returns a list of size 1. |
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330 |
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331 Each path test in turn is a sequence of tests that correspond to the |
111
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332 location steps, each tuples of the form `(axis, testfunc, predicates)` |
106
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333 """ |
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334 paths = [self._location_path()] |
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335 while self.cur_token == '|': |
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336 self.next_token() |
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337 paths.append(self._location_path()) |
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338 if not self.at_end: |
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339 raise PathSyntaxError('Unexpected token %r after end of expression' |
139
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340 % self.cur_token, self.filename, self.lineno) |
106
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341 return paths |
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342 |
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343 def _location_path(self): |
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344 steps = [] |
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345 while True: |
215 | 346 if self.cur_token.startswith('/'): |
347 if self.cur_token == '//': | |
348 steps.append((DESCENDANT_OR_SELF, NodeTest(), [])) | |
349 elif not steps: | |
350 raise PathSyntaxError('Absolute location paths not ' | |
351 'supported', self.filename, | |
352 self.lineno) | |
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353 self.next_token() |
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354 |
137 | 355 axis, nodetest, predicates = self._location_step() |
356 if not axis: | |
145
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357 axis = CHILD |
137 | 358 steps.append((axis, nodetest, predicates)) |
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359 |
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360 if self.at_end or not self.cur_token.startswith('/'): |
106
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361 break |
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362 |
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363 return steps |
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364 |
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365 def _location_step(self): |
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366 if self.cur_token == '@': |
114 | 367 axis = ATTRIBUTE |
106
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368 self.next_token() |
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369 elif self.cur_token == '.': |
114 | 370 axis = SELF |
137 | 371 elif self.cur_token == '..': |
139
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372 raise PathSyntaxError('Unsupported axis "parent"', self.filename, |
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373 self.lineno) |
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374 elif self.peek_token() == '::': |
114 | 375 axis = Axis.forname(self.cur_token) |
376 if axis is None: | |
139
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377 raise PathSyntaxError('Unsupport axis "%s"' % axis, |
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378 self.filename, self.lineno) |
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379 self.next_token() |
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380 self.next_token() |
106
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381 else: |
137 | 382 axis = None |
383 nodetest = self._node_test(axis or CHILD) | |
111
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384 predicates = [] |
106
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385 while self.cur_token == '[': |
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386 predicates.append(self._predicate()) |
137 | 387 return axis, nodetest, predicates |
106
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388 |
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389 def _node_test(self, axis=None): |
224
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390 test = prefix = None |
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391 next_token = self.peek_token() |
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392 if next_token in ('(', '()'): # Node type test |
106
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393 test = self._node_type() |
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|
394 |
224
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395 elif next_token == ':': # Namespace prefix |
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396 prefix = self.cur_token |
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|
397 self.next_token() |
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|
398 localname = self.next_token() |
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|
399 if localname == '*': |
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400 test = QualifiedPrincipalTypeTest(axis, prefix) |
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|
401 else: |
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|
402 test = QualifiedNameTest(axis, prefix, localname) |
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|
403 |
106
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|
404 else: # Name test |
137 | 405 if self.cur_token == '*': |
406 test = PrincipalTypeTest(axis) | |
407 elif self.cur_token == '.': | |
408 test = NodeTest() | |
106
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409 else: |
137 | 410 test = LocalNameTest(axis, self.cur_token) |
106
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|
411 |
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|
412 if not self.at_end: |
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|
413 self.next_token() |
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|
414 return test |
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|
415 |
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|
416 def _node_type(self): |
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|
417 name = self.cur_token |
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|
418 self.next_token() |
137 | 419 |
420 args = [] | |
421 if self.cur_token != '()': | |
422 # The processing-instruction() function optionally accepts the | |
423 # name of the PI as argument, which must be a literal string | |
424 self.next_token() # ( | |
425 if self.cur_token != ')': | |
426 string = self.cur_token | |
427 if (string[0], string[-1]) in self._QUOTES: | |
428 string = string[1:-1] | |
429 args.append(string) | |
430 | |
431 cls = _nodetest_map.get(name) | |
432 if not cls: | |
139
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433 raise PathSyntaxError('%s() not allowed here' % name, self.filename, |
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434 self.lineno) |
137 | 435 return cls(*args) |
106
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|
436 |
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diff
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|
437 def _predicate(self): |
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|
438 assert self.cur_token == '[' |
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|
439 self.next_token() |
111
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|
440 expr = self._or_expr() |
121
22a7080ed242
Added support for the XPath functions `name()`, `namespace-uri()`, `local-name()`, and `not()`.
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diff
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|
441 if self.cur_token != ']': |
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Added support for the XPath functions `name()`, `namespace-uri()`, `local-name()`, and `not()`.
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114
diff
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|
442 raise PathSyntaxError('Expected "]" to close predicate, ' |
139
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443 'but found "%s"' % self.cur_token, |
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|
444 self.filename, self.lineno) |
111
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|
445 if not self.at_end: |
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|
446 self.next_token() |
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|
447 return expr |
106
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|
448 |
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|
449 def _or_expr(self): |
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|
450 expr = self._and_expr() |
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|
451 while self.cur_token == 'or': |
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452 self.next_token() |
137 | 453 expr = OrOperator(expr, self._and_expr()) |
106
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|
454 return expr |
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|
455 |
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|
456 def _and_expr(self): |
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|
457 expr = self._equality_expr() |
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458 while self.cur_token == 'and': |
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|
459 self.next_token() |
137 | 460 expr = AndOperator(expr, self._equality_expr()) |
106
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|
461 return expr |
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|
462 |
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|
463 def _equality_expr(self): |
162
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|
464 expr = self._relational_expr() |
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Implement the XPath relational operators and the `round()` function.
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465 while self.cur_token in ('=', '!='): |
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466 op = _operator_map[self.cur_token] |
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|
467 self.next_token() |
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|
468 expr = op(expr, self._relational_expr()) |
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Implement the XPath relational operators and the `round()` function.
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469 return expr |
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Implement the XPath relational operators and the `round()` function.
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|
470 |
f767cf98e3e3
Implement the XPath relational operators and the `round()` function.
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diff
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|
471 def _relational_expr(self): |
106
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472 expr = self._primary_expr() |
162
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|
473 while self.cur_token in ('>', '>=', '<', '>='): |
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474 op = _operator_map[self.cur_token] |
106
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475 self.next_token() |
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476 expr = op(expr, self._primary_expr()) |
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477 return expr |
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478 |
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479 def _primary_expr(self): |
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480 token = self.cur_token |
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481 if len(token) > 1 and (token[0], token[-1]) in self._QUOTES: |
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482 self.next_token() |
137 | 483 return StringLiteral(token[1:-1]) |
163
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484 elif token[0].isdigit() or token[0] == '.': |
106
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485 self.next_token() |
137 | 486 return NumberLiteral(float(token)) |
179
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487 elif token == '$': |
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488 token = self.next_token() |
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489 self.next_token() |
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490 return VariableReference(token) |
121
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491 elif not self.at_end and self.peek_token().startswith('('): |
155
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492 return self._function_call() |
106
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493 else: |
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494 axis = None |
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495 if token == '@': |
114 | 496 axis = ATTRIBUTE |
106
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497 self.next_token() |
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498 return self._node_test(axis) |
137 | 499 |
155
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500 def _function_call(self): |
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501 name = self.cur_token |
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502 if self.next_token() == '()': |
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503 args = [] |
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504 else: |
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505 assert self.cur_token == '(' |
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506 self.next_token() |
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507 args = [self._or_expr()] |
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508 while self.cur_token == ',': |
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509 self.next_token() |
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510 args.append(self._or_expr()) |
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511 if not self.cur_token == ')': |
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512 raise PathSyntaxError('Expected ")" to close function argument ' |
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513 'list, but found "%s"' % self.cur_token, |
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514 self.filename, self.lineno) |
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515 self.next_token() |
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516 cls = _function_map.get(name) |
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517 if not cls: |
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518 raise PathSyntaxError('Unsupported function "%s"' % name, |
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519 self.filename, self.lineno) |
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520 return cls(*args) |
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521 |
137 | 522 |
523 # Node tests | |
524 | |
525 class PrincipalTypeTest(object): | |
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526 """Node test that matches any event with the given principal type.""" |
137 | 527 __slots__ = ['principal_type'] |
528 def __init__(self, principal_type): | |
529 self.principal_type = principal_type | |
224
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530 def __call__(self, kind, data, pos, namespaces, variables): |
137 | 531 if kind is START: |
532 if self.principal_type is ATTRIBUTE: | |
533 return data[1] or None | |
534 else: | |
535 return True | |
536 def __repr__(self): | |
537 return '*' | |
538 | |
224
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539 class QualifiedPrincipalTypeTest(object): |
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540 """Node test that matches any event with the given principal type in a |
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541 specific namespace.""" |
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542 __slots__ = ['principal_type', 'prefix'] |
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543 def __init__(self, principal_type, prefix): |
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544 self.principal_type = principal_type |
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545 self.prefix = prefix |
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546 def __call__(self, kind, data, pos, namespaces, variables): |
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547 namespace = Namespace(namespaces.get(self.prefix)) |
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548 if kind is START: |
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549 if self.principal_type is ATTRIBUTE and data[1]: |
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550 return Attrs([(name, value) for name, value in data[1] |
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551 if name in namespace]) or None |
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552 else: |
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553 return data[0] in namespace |
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554 def __repr__(self): |
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555 return '%s:*' % self.prefix |
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556 |
137 | 557 class LocalNameTest(object): |
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558 """Node test that matches any event with the given prinipal type and |
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559 local name. |
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560 """ |
137 | 561 __slots__ = ['principal_type', 'name'] |
562 def __init__(self, principal_type, name): | |
563 self.principal_type = principal_type | |
564 self.name = name | |
224
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565 def __call__(self, kind, data, pos, namespaces, variables): |
137 | 566 if kind is START: |
567 if self.principal_type is ATTRIBUTE and self.name in data[1]: | |
234 | 568 return data[1].get(self.name) |
137 | 569 else: |
570 return data[0].localname == self.name | |
571 def __repr__(self): | |
572 return self.name | |
573 | |
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574 class QualifiedNameTest(object): |
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575 """Node test that matches any event with the given prinipal type and |
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576 qualified name. |
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577 """ |
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578 __slots__ = ['principal_type', 'prefix', 'name'] |
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579 def __init__(self, principal_type, prefix, name): |
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580 self.principal_type = principal_type |
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581 self.prefix = prefix |
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582 self.name = name |
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583 def __call__(self, kind, data, pos, namespaces, variables): |
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584 qname = QName('%s}%s' % (namespaces.get(self.prefix), self.name)) |
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585 if kind is START: |
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586 if self.principal_type is ATTRIBUTE and qname in data[1]: |
234 | 587 return data[1].get(qname) |
224
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588 else: |
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589 return data[0] == qname |
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590 def __repr__(self): |
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591 return '%s:%s' % (self.prefix, self.name) |
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592 |
137 | 593 class CommentNodeTest(object): |
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594 """Node test that matches any comment events.""" |
137 | 595 __slots__ = [] |
224
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596 def __call__(self, kind, data, pos, namespaces, variables): |
330
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597 return kind is COMMENT |
137 | 598 def __repr__(self): |
599 return 'comment()' | |
600 | |
601 class NodeTest(object): | |
161
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602 """Node test that matches any node.""" |
137 | 603 __slots__ = [] |
224
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604 def __call__(self, kind, data, pos, namespaces, variables): |
137 | 605 if kind is START: |
606 return True | |
607 return kind, data, pos | |
608 def __repr__(self): | |
609 return 'node()' | |
610 | |
611 class ProcessingInstructionNodeTest(object): | |
161
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612 """Node test that matches any processing instruction event.""" |
137 | 613 __slots__ = ['target'] |
614 def __init__(self, target=None): | |
615 self.target = target | |
224
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616 def __call__(self, kind, data, pos, namespaces, variables): |
330
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617 return kind is PI and (not self.target or data[0] == self.target) |
137 | 618 def __repr__(self): |
619 arg = '' | |
620 if self.target: | |
621 arg = '"' + self.target + '"' | |
622 return 'processing-instruction(%s)' % arg | |
623 | |
624 class TextNodeTest(object): | |
161
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625 """Node test that matches any text event.""" |
137 | 626 __slots__ = [] |
224
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627 def __call__(self, kind, data, pos, namespaces, variables): |
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628 return kind is TEXT |
137 | 629 def __repr__(self): |
630 return 'text()' | |
631 | |
632 _nodetest_map = {'comment': CommentNodeTest, 'node': NodeTest, | |
633 'processing-instruction': ProcessingInstructionNodeTest, | |
634 'text': TextNodeTest} | |
635 | |
636 # Functions | |
637 | |
155
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638 class Function(object): |
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639 """Base class for function nodes in XPath expressions.""" |
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640 |
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641 class BooleanFunction(Function): |
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642 """The `boolean` function, which converts its argument to a boolean |
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643 value. |
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644 """ |
155
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645 __slots__ = ['expr'] |
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646 def __init__(self, expr): |
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647 self.expr = expr |
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648 def __call__(self, kind, data, pos, namespaces, variables): |
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649 val = self.expr(kind, data, pos, namespaces, variables) |
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650 return bool(val) |
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651 def __repr__(self): |
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652 return 'boolean(%r)' % self.expr |
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653 |
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654 class CeilingFunction(Function): |
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655 """The `ceiling` function, which returns the nearest lower integer number |
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656 for the given number. |
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657 """ |
155
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658 __slots__ = ['number'] |
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659 def __init__(self, number): |
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660 self.number = number |
224
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661 def __call__(self, kind, data, pos, namespaces, variables): |
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662 number = self.number(kind, data, pos, namespaces, variables) |
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663 return ceil(float(number)) |
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664 def __repr__(self): |
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665 return 'ceiling(%r)' % self.number |
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666 |
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667 class ConcatFunction(Function): |
161
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668 """The `concat` function, which concatenates (joins) the variable number of |
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669 strings it gets as arguments. |
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670 """ |
155
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671 __slots__ = ['exprs'] |
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672 def __init__(self, *exprs): |
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673 self.exprs = exprs |
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674 def __call__(self, kind, data, pos, namespaces, variables): |
155
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675 strings = [] |
224
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676 for item in [expr(kind, data, pos, namespaces, variables) |
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677 for expr in self.exprs]: |
155
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678 strings.append(item) |
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679 return u''.join(strings) |
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680 def __repr__(self): |
169 | 681 return 'concat(%s)' % ', '.join([repr(expr) for expr in self.exprs]) |
155
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682 |
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683 class ContainsFunction(Function): |
161
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684 """The `contains` function, which returns whether a string contains a given |
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685 substring. |
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686 """ |
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687 __slots__ = ['string1', 'string2'] |
155
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688 def __init__(self, string1, string2): |
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689 self.string1 = string1 |
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690 self.string2 = string2 |
224
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691 def __call__(self, kind, data, pos, namespaces, variables): |
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692 string1 = self.string1(kind, data, pos, namespaces, variables) |
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693 string2 = self.string2(kind, data, pos, namespaces, variables) |
155
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694 return string2 in string1 |
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695 def __repr__(self): |
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696 return 'contains(%r, %r)' % (self.string1, self.string2) |
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697 |
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698 class FalseFunction(Function): |
161
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699 """The `false` function, which always returns the boolean `false` value.""" |
155
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700 __slots__ = [] |
224
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701 def __call__(self, kind, data, pos, namespaces, variables): |
155
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702 return False |
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|
703 def __repr__(self): |
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|
704 return 'false()' |
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|
705 |
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|
706 class FloorFunction(Function): |
161
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|
707 """The `ceiling` function, which returns the nearest higher integer number |
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|
708 for the given number. |
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|
709 """ |
155
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710 __slots__ = ['number'] |
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|
711 def __init__(self, number): |
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712 self.number = number |
224
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713 def __call__(self, kind, data, pos, namespaces, variables): |
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714 number = self.number(kind, data, pos, namespaces, variables) |
155
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715 return floor(float(number)) |
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|
716 def __repr__(self): |
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|
717 return 'floor(%r)' % self.number |
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|
718 |
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719 class LocalNameFunction(Function): |
161
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720 """The `local-name` function, which returns the local name of the current |
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|
721 element. |
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|
722 """ |
137 | 723 __slots__ = [] |
224
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724 def __call__(self, kind, data, pos, namespaces, variables): |
137 | 725 if kind is START: |
234 | 726 return data[0].localname |
137 | 727 def __repr__(self): |
728 return 'local-name()' | |
729 | |
155
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730 class NameFunction(Function): |
161
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731 """The `name` function, which returns the qualified name of the current |
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|
732 element. |
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|
733 """ |
137 | 734 __slots__ = [] |
224
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735 def __call__(self, kind, data, pos, namespaces, variables): |
137 | 736 if kind is START: |
234 | 737 return data[0] |
137 | 738 def __repr__(self): |
739 return 'name()' | |
740 | |
155
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741 class NamespaceUriFunction(Function): |
161
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742 """The `namespace-uri` function, which returns the namespace URI of the |
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|
743 current element. |
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|
744 """ |
137 | 745 __slots__ = [] |
224
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746 def __call__(self, kind, data, pos, namespaces, variables): |
137 | 747 if kind is START: |
234 | 748 return data[0].namespace |
137 | 749 def __repr__(self): |
750 return 'namespace-uri()' | |
751 | |
155
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752 class NotFunction(Function): |
161
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753 """The `not` function, which returns the negated boolean value of its |
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|
754 argument. |
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|
755 """ |
137 | 756 __slots__ = ['expr'] |
757 def __init__(self, expr): | |
758 self.expr = expr | |
224
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759 def __call__(self, kind, data, pos, namespaces, variables): |
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760 return not self.expr(kind, data, pos, namespaces, variables) |
137 | 761 def __repr__(self): |
762 return 'not(%s)' % self.expr | |
763 | |
155
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764 class NormalizeSpaceFunction(Function): |
161
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|
765 """The `normalize-space` function, which removes leading and trailing |
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|
766 whitespace in the given string, and replaces multiple adjacent whitespace |
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|
767 characters inside the string with a single space. |
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|
768 """ |
155
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|
769 __slots__ = ['expr'] |
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|
770 _normalize = re.compile(r'\s{2,}').sub |
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771 def __init__(self, expr): |
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|
772 self.expr = expr |
224
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773 def __call__(self, kind, data, pos, namespaces, variables): |
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774 string = self.expr(kind, data, pos, namespaces, variables) |
155
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775 return self._normalize(' ', string.strip()) |
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776 def __repr__(self): |
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777 return 'normalize-space(%s)' % repr(self.expr) |
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778 |
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|
779 class NumberFunction(Function): |
161
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|
780 """The `number` function that converts its argument to a number.""" |
155
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781 __slots__ = ['expr'] |
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|
782 def __init__(self, expr): |
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|
783 self.expr = expr |
224
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784 def __call__(self, kind, data, pos, namespaces, variables): |
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785 val = self.expr(kind, data, pos, namespaces, variables) |
155
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786 return float(val) |
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|
787 def __repr__(self): |
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788 return 'number(%r)' % self.expr |
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789 |
162
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790 class RoundFunction(Function): |
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791 """The `round` function, which returns the nearest integer number for the |
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|
792 given number. |
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|
793 """ |
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|
794 __slots__ = ['number'] |
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|
795 def __init__(self, number): |
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|
796 self.number = number |
224
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797 def __call__(self, kind, data, pos, namespaces, variables): |
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|
798 number = self.number(kind, data, pos, namespaces, variables) |
162
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|
799 return round(float(number)) |
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|
800 def __repr__(self): |
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|
801 return 'round(%r)' % self.number |
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|
802 |
155
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|
803 class StartsWithFunction(Function): |
161
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|
804 """The `starts-with` function that returns whether one string starts with |
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|
805 a given substring. |
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|
806 """ |
155
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|
807 __slots__ = ['string1', 'string2'] |
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|
808 def __init__(self, string1, string2): |
282
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Fix `starts-with()` XPath function so that it actually compares the two strings. Closes #61.
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|
809 self.string1 = string1 |
155
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|
810 self.string2 = string2 |
224
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811 def __call__(self, kind, data, pos, namespaces, variables): |
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812 string1 = self.string1(kind, data, pos, namespaces, variables) |
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813 string2 = self.string2(kind, data, pos, namespaces, variables) |
155
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814 return string1.startswith(string2) |
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815 def __repr__(self): |
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816 return 'starts-with(%r, %r)' % (self.string1, self.string2) |
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817 |
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818 class StringLengthFunction(Function): |
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819 """The `string-length` function that returns the length of the given |
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|
820 string. |
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|
821 """ |
155
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822 __slots__ = ['expr'] |
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823 def __init__(self, expr): |
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824 self.expr = expr |
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825 def __call__(self, kind, data, pos, namespaces, variables): |
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826 string = self.expr(kind, data, pos, namespaces, variables) |
155
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827 return len(string) |
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|
828 def __repr__(self): |
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829 return 'string-length(%r)' % self.expr |
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|
830 |
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831 class SubstringFunction(Function): |
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832 """The `substring` function that returns the part of a string that starts |
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|
833 at the given offset, and optionally limited to the given length. |
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|
834 """ |
155
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835 __slots__ = ['string', 'start', 'length'] |
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836 def __init__(self, string, start, length=None): |
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837 self.string = string |
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|
838 self.start = start |
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839 self.length = length |
224
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840 def __call__(self, kind, data, pos, namespaces, variables): |
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841 string = self.string(kind, data, pos, namespaces, variables) |
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842 start = self.start(kind, data, pos, namespaces, variables) |
155
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843 length = 0 |
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844 if self.length is not None: |
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845 length = self.length(kind, data, pos, namespaces, variables) |
155
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846 return string[int(start):len(string) - int(length)] |
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847 def __repr__(self): |
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|
848 if self.length is not None: |
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849 return 'substring(%r, %r, %r)' % (self.string, self.start, |
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850 self.length) |
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|
851 else: |
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|
852 return 'substring(%r, %r)' % (self.string, self.start) |
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|
853 |
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|
854 class SubstringAfterFunction(Function): |
161
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855 """The `substring-after` function that returns the part of a string that |
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|
856 is found after the given substring. |
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|
857 """ |
155
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858 __slots__ = ['string1', 'string2'] |
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859 def __init__(self, string1, string2): |
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|
860 self.string1 = string1 |
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|
861 self.string2 = string2 |
224
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862 def __call__(self, kind, data, pos, namespaces, variables): |
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863 string1 = self.string1(kind, data, pos, namespaces, variables) |
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864 string2 = self.string2(kind, data, pos, namespaces, variables) |
155
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865 index = string1.find(string2) |
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|
866 if index >= 0: |
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|
867 return string1[index + len(string2):] |
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|
868 return u'' |
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|
869 def __repr__(self): |
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|
870 return 'substring-after(%r, %r)' % (self.string1, self.string2) |
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|
871 |
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|
872 class SubstringBeforeFunction(Function): |
161
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|
873 """The `substring-before` function that returns the part of a string that |
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|
874 is found before the given substring. |
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|
875 """ |
155
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|
876 __slots__ = ['string1', 'string2'] |
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|
877 def __init__(self, string1, string2): |
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|
878 self.string1 = string1 |
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|
879 self.string2 = string2 |
224
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|
880 def __call__(self, kind, data, pos, namespaces, variables): |
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|
881 string1 = self.string1(kind, data, pos, namespaces, variables) |
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882 string2 = self.string2(kind, data, pos, namespaces, variables) |
155
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|
883 index = string1.find(string2) |
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|
884 if index >= 0: |
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|
885 return string1[:index] |
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diff
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|
886 return u'' |
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diff
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|
887 def __repr__(self): |
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|
888 return 'substring-after(%r, %r)' % (self.string1, self.string2) |
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|
889 |
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diff
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|
890 class TranslateFunction(Function): |
161
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|
891 """The `translate` function that translates a set of characters in a |
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|
892 string to target set of characters. |
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|
893 """ |
155
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|
894 __slots__ = ['string', 'fromchars', 'tochars'] |
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|
895 def __init__(self, string, fromchars, tochars): |
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|
896 self.string = string |
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|
897 self.fromchars = fromchars |
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|
898 self.tochars = tochars |
224
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|
899 def __call__(self, kind, data, pos, namespaces, variables): |
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diff
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|
900 string = self.string(kind, data, pos, namespaces, variables) |
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|
901 fromchars = self.fromchars(kind, data, pos, namespaces, variables) |
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|
902 tochars = self.tochars(kind, data, pos, namespaces, variables) |
155
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|
903 table = dict(zip([ord(c) for c in fromchars], |
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|
904 [ord(c) for c in tochars])) |
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diff
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|
905 return string.translate(table) |
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diff
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|
906 def __repr__(self): |
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|
907 return 'translate(%r, %r, %r)' % (self.string, self.fromchars, |
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|
908 self.tochars) |
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diff
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|
909 |
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diff
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|
910 class TrueFunction(Function): |
161
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|
911 """The `true` function, which always returns the boolean `true` value.""" |
155
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|
912 __slots__ = [] |
224
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|
913 def __call__(self, kind, data, pos, namespaces, variables): |
155
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|
914 return True |
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diff
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|
915 def __repr__(self): |
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diff
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|
916 return 'true()' |
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diff
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|
917 |
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|
918 _function_map = {'boolean': BooleanFunction, 'ceiling': CeilingFunction, |
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|
919 'concat': ConcatFunction, 'contains': ContainsFunction, |
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|
920 'false': FalseFunction, 'floor': FloorFunction, |
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|
921 'local-name': LocalNameFunction, 'name': NameFunction, |
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|
922 'namespace-uri': NamespaceUriFunction, |
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|
923 'normalize-space': NormalizeSpaceFunction, 'not': NotFunction, |
162
f767cf98e3e3
Implement the XPath relational operators and the `round()` function.
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161
diff
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|
924 'number': NumberFunction, 'round': RoundFunction, |
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Implement the XPath relational operators and the `round()` function.
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diff
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|
925 'starts-with': StartsWithFunction, |
155
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diff
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|
926 'string-length': StringLengthFunction, |
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|
927 'substring': SubstringFunction, |
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|
928 'substring-after': SubstringAfterFunction, |
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|
929 'substring-before': SubstringBeforeFunction, |
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|
930 'translate': TranslateFunction, 'true': TrueFunction} |
137 | 931 |
179
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|
932 # Literals & Variables |
137 | 933 |
155
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|
934 class Literal(object): |
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diff
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|
935 """Abstract base class for literal nodes.""" |
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diff
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|
936 |
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|
937 class StringLiteral(Literal): |
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|
938 """A string literal node.""" |
137 | 939 __slots__ = ['text'] |
940 def __init__(self, text): | |
941 self.text = text | |
224
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|
942 def __call__(self, kind, data, pos, namespaces, variables): |
228
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|
943 return self.text |
137 | 944 def __repr__(self): |
945 return '"%s"' % self.text | |
946 | |
155
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|
947 class NumberLiteral(Literal): |
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|
948 """A number literal node.""" |
137 | 949 __slots__ = ['number'] |
950 def __init__(self, number): | |
951 self.number = number | |
224
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|
952 def __call__(self, kind, data, pos, namespaces, variables): |
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|
953 return self.number |
137 | 954 def __repr__(self): |
955 return str(self.number) | |
956 | |
179
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957 class VariableReference(Literal): |
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958 """A variable reference node.""" |
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959 __slots__ = ['name'] |
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960 def __init__(self, name): |
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961 self.name = name |
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962 def __call__(self, kind, data, pos, namespaces, variables): |
228
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963 return variables.get(self.name) |
179
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964 def __repr__(self): |
215 | 965 return str(self.name) |
179
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966 |
137 | 967 # Operators |
968 | |
969 class AndOperator(object): | |
161
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970 """The boolean operator `and`.""" |
137 | 971 __slots__ = ['lval', 'rval'] |
972 def __init__(self, lval, rval): | |
973 self.lval = lval | |
974 self.rval = rval | |
224
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975 def __call__(self, kind, data, pos, namespaces, variables): |
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976 lval = self.lval(kind, data, pos, namespaces, variables) |
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977 if not lval: |
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978 return False |
224
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979 rval = self.rval(kind, data, pos, namespaces, variables) |
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980 return bool(rval) |
137 | 981 def __repr__(self): |
161
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982 return '%s and %s' % (self.lval, self.rval) |
137 | 983 |
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984 class EqualsOperator(object): |
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985 """The equality operator `=`.""" |
137 | 986 __slots__ = ['lval', 'rval'] |
987 def __init__(self, lval, rval): | |
988 self.lval = lval | |
989 self.rval = rval | |
224
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990 def __call__(self, kind, data, pos, namespaces, variables): |
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991 lval = self.lval(kind, data, pos, namespaces, variables) |
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992 rval = self.rval(kind, data, pos, namespaces, variables) |
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993 return lval == rval |
137 | 994 def __repr__(self): |
161
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995 return '%s=%s' % (self.lval, self.rval) |
137 | 996 |
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997 class NotEqualsOperator(object): |
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998 """The equality operator `!=`.""" |
137 | 999 __slots__ = ['lval', 'rval'] |
1000 def __init__(self, lval, rval): | |
1001 self.lval = lval | |
1002 self.rval = rval | |
224
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1003 def __call__(self, kind, data, pos, namespaces, variables): |
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1004 lval = self.lval(kind, data, pos, namespaces, variables) |
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1005 rval = self.rval(kind, data, pos, namespaces, variables) |
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1006 return lval != rval |
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1007 def __repr__(self): |
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1008 return '%s!=%s' % (self.lval, self.rval) |
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1009 |
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1010 class OrOperator(object): |
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1011 """The boolean operator `or`.""" |
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1012 __slots__ = ['lval', 'rval'] |
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1013 def __init__(self, lval, rval): |
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1014 self.lval = lval |
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1015 self.rval = rval |
224
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1016 def __call__(self, kind, data, pos, namespaces, variables): |
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1017 lval = self.lval(kind, data, pos, namespaces, variables) |
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1018 if lval: |
137 | 1019 return True |
224
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1020 rval = self.rval(kind, data, pos, namespaces, variables) |
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1021 return bool(rval) |
137 | 1022 def __repr__(self): |
1023 return '%s or %s' % (self.lval, self.rval) | |
1024 | |
162
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1025 class GreaterThanOperator(object): |
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1026 """The relational operator `>` (greater than).""" |
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1027 __slots__ = ['lval', 'rval'] |
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1028 def __init__(self, lval, rval): |
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1029 self.lval = lval |
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1030 self.rval = rval |
224
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1031 def __call__(self, kind, data, pos, namespaces, variables): |
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1032 lval = self.lval(kind, data, pos, namespaces, variables) |
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1033 rval = self.rval(kind, data, pos, namespaces, variables) |
162
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1034 return float(lval) > float(rval) |
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1035 def __repr__(self): |
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1036 return '%s>%s' % (self.lval, self.rval) |
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1037 |
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1038 class GreaterThanOrEqualOperator(object): |
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1039 """The relational operator `>=` (greater than or equal).""" |
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1040 __slots__ = ['lval', 'rval'] |
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1041 def __init__(self, lval, rval): |
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1042 self.lval = lval |
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1043 self.rval = rval |
224
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1044 def __call__(self, kind, data, pos, namespaces, variables): |
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1045 lval = self.lval(kind, data, pos, namespaces, variables) |
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1046 rval = self.rval(kind, data, pos, namespaces, variables) |
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1047 return float(lval) >= float(rval) |
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1048 def __repr__(self): |
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1049 return '%s>=%s' % (self.lval, self.rval) |
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1050 |
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1051 class LessThanOperator(object): |
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1052 """The relational operator `<` (less than).""" |
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1053 __slots__ = ['lval', 'rval'] |
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1054 def __init__(self, lval, rval): |
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1055 self.lval = lval |
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1056 self.rval = rval |
224
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1057 def __call__(self, kind, data, pos, namespaces, variables): |
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1058 lval = self.lval(kind, data, pos, namespaces, variables) |
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1059 rval = self.rval(kind, data, pos, namespaces, variables) |
162
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1060 return float(lval) < float(rval) |
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1061 def __repr__(self): |
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1062 return '%s<%s' % (self.lval, self.rval) |
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1063 |
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1064 class LessThanOrEqualOperator(object): |
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1065 """The relational operator `<=` (less than or equal).""" |
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1066 __slots__ = ['lval', 'rval'] |
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1067 def __init__(self, lval, rval): |
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1068 self.lval = lval |
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1069 self.rval = rval |
224
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1070 def __call__(self, kind, data, pos, namespaces, variables): |
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1071 lval = self.lval(kind, data, pos, namespaces, variables) |
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1072 rval = self.rval(kind, data, pos, namespaces, variables) |
162
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1073 return float(lval) <= float(rval) |
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1074 def __repr__(self): |
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1075 return '%s<=%s' % (self.lval, self.rval) |
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1076 |
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1077 _operator_map = {'=': EqualsOperator, '!=': NotEqualsOperator, |
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1078 '>': GreaterThanOperator, '>=': GreaterThanOrEqualOperator, |
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1079 '<': LessThanOperator, '>=': LessThanOrEqualOperator} |