Mercurial > genshi > genshi-test
annotate genshi/path.py @ 289:7487632f467c stable-0.3.x
Ported [356] to 0.3.x branch.
author | cmlenz |
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date | Fri, 13 Oct 2006 07:43:41 +0000 |
parents | c685294b1156 |
children | 6e6950ac0e56 059d6e7415d2 |
rev | line source |
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1 | 1 # -*- coding: utf-8 -*- |
2 # | |
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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 |
111
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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() |
120 for kind, data, pos in stream: | |
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121 result = test(kind, data, pos, namespaces, variables) |
1 | 122 if result is True: |
123 yield kind, data, pos | |
124 depth = 1 | |
125 while depth > 0: | |
73 | 126 subkind, subdata, subpos = stream.next() |
127 if subkind is START: | |
128 depth += 1 | |
129 elif subkind is END: | |
130 depth -= 1 | |
131 yield subkind, subdata, subpos | |
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132 test(subkind, subdata, subpos, namespaces, variables) |
1 | 133 elif result: |
134 yield result | |
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135 return Stream(_generate()) |
1 | 136 |
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137 def test(self, ignore_context=False): |
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138 """Returns a function that can be used to track whether the path matches |
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139 a specific stream event. |
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140 |
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141 The function returned expects the positional arguments `kind`, `data`, |
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142 `pos` (basically an unpacked stream event), as well as `namespaces` |
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143 and `variables`. The latter two are a mapping of namespace prefixes to |
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144 URIs, and a mapping of variable names to values, respectively. |
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145 |
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146 If the path matches the event, the function returns the match (for |
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147 example, a `START` or `TEXT` event.) Otherwise, it returns `None`. |
33 | 148 |
230 | 149 >>> from genshi.input import XML |
33 | 150 >>> xml = XML('<root><elem><child id="1"/></elem><child id="2"/></root>') |
151 >>> test = Path('child').test() | |
152 >>> for kind, data, pos in xml: | |
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153 ... if test(kind, data, pos, {}, {}): |
33 | 154 ... print kind, data |
155 START (u'child', [(u'id', u'2')]) | |
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156 """ |
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157 paths = [(p, len(p), [0], [], [0] * len(p)) for p in self.paths] |
1 | 158 |
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159 def _test(kind, data, pos, namespaces, variables): |
261 | 160 retval = None |
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161 for steps, size, cursors, cutoff, counter in paths: |
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162 |
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163 # Manage the stack that tells us "where we are" in the stream |
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164 if kind is END: |
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165 if cursors: |
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166 cursors.pop() |
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167 continue |
223 | 168 elif kind is START: |
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169 cursors.append(cursors and cursors[-1] or 0) |
261 | 170 |
171 if retval or not cursors: | |
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172 continue |
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173 cursor = cursors[-1] |
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174 depth = len(cursors) |
1 | 175 |
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176 if cutoff and depth + int(kind is not START) > cutoff[0]: |
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177 continue |
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178 |
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179 ctxtnode = not ignore_context and kind is START \ |
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180 and depth == 2 |
261 | 181 matched = None |
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182 while 1: |
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183 # Fetch the next location step |
137 | 184 axis, nodetest, predicates = steps[cursor] |
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185 |
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186 # If this is the start event for the context node, and the |
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187 # axis of the location step doesn't include the current |
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188 # element, skip the test |
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189 if ctxtnode and (axis is CHILD or axis is DESCENDANT): |
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190 break |
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191 |
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192 # Is this the last step of the location path? |
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193 last_step = cursor + 1 == size |
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194 |
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195 # Perform the actual node test |
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196 matched = nodetest(kind, data, pos, namespaces, variables) |
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197 |
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198 # The node test matched |
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199 if matched: |
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200 |
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201 # Check all the predicates for this step |
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202 if predicates: |
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203 for predicate in predicates: |
228
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204 pretval = predicate(kind, data, pos, namespaces, |
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205 variables) |
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206 if type(pretval) is float: |
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207 counter[cursor] += 1 |
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208 if counter[cursor] != int(pretval): |
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209 pretval = False |
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210 if not pretval: |
216
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211 matched = None |
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212 break |
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213 |
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214 # Both the node test and the predicates matched |
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215 if matched: |
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216 if last_step: |
217
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217 if not ctxtnode or kind is not START \ |
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218 or axis is ATTRIBUTE or axis is SELF: |
216
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219 retval = matched |
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220 elif not ctxtnode or axis is SELF \ |
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221 or axis is DESCENDANT_OR_SELF: |
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222 cursor += 1 |
228
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223 cursors[-1] = cursor |
216
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224 cutoff[:] = [] |
228
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225 |
216
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226 elif not ignore_context and kind is START: |
228
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227 cutoff[:] = [depth] |
216
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228 |
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229 if last_step and not ignore_context and kind is START: |
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230 if (axis is not DESCENDANT and |
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231 axis is not DESCENDANT_OR_SELF): |
228
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232 cutoff[:] = [depth] |
216
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233 |
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234 if kind is START and not last_step: |
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235 next_axis = steps[cursor][0] |
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236 if next_axis is ATTRIBUTE: |
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237 # If the axis of the next location step is the |
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238 # attribute axis, we need to move on to processing |
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239 # that step without waiting for the next markup |
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240 # event |
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241 continue |
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242 |
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243 # We're done with this step if it's the last step or the |
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244 # axis isn't "self" |
217
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245 if last_step or (axis is not SELF and |
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246 axis is not DESCENDANT_OR_SELF): |
216
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247 break |
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248 |
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249 if kind is START and axis is not DESCENDANT \ |
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250 and axis is not DESCENDANT_OR_SELF: |
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251 # If this step is not a closure, it cannot be matched until |
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252 # the current element is closed... so we need to move the |
114 | 253 # cursor back to the previous closure and retest that |
254 # against the current element | |
215 | 255 backsteps = [(k, d, p) for k, d, p in steps[:cursor] |
256 if k is DESCENDANT or k is DESCENDANT_OR_SELF] | |
111
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257 backsteps.reverse() |
137 | 258 for axis, nodetest, predicates in backsteps: |
224
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259 matched = nodetest(kind, data, pos, namespaces, |
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260 variables) |
111
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261 if not matched: |
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262 cursor -= 1 |
216
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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).
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263 cutoff[:] = [] |
111
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264 break |
228
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265 cursors[-1] = cursor |
1 | 266 |
261 | 267 return retval |
1 | 268 |
269 return _test | |
270 | |
271 | |
106
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272 class PathSyntaxError(Exception): |
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273 """Exception raised when an XPath expression is syntactically incorrect.""" |
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274 |
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275 def __init__(self, message, filename=None, lineno=-1, offset=-1): |
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276 if filename: |
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277 message = '%s (%s, line %d)' % (message, filename, lineno) |
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278 Exception.__init__(self, message) |
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279 self.filename = filename |
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280 self.lineno = lineno |
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281 self.offset = offset |
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282 |
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283 |
137 | 284 class PathParser(object): |
106
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285 """Tokenizes and parses an XPath expression.""" |
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286 |
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287 _QUOTES = (("'", "'"), ('"', '"')) |
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288 _TOKENS = ('::', ':', '..', '.', '//', '/', '[', ']', '()', '(', ')', '@', |
179
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289 '=', '!=', '!', '|', ',', '>=', '>', '<=', '<', '$') |
163
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290 _tokenize = re.compile('("[^"]*")|(\'[^\']*\')|((?:\d+)?\.\d+)|(%s)|([^%s\s]+)|\s+' % ( |
106
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291 '|'.join([re.escape(t) for t in _TOKENS]), |
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292 ''.join([re.escape(t[0]) for t in _TOKENS]))).findall |
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293 |
139
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294 def __init__(self, text, filename=None, lineno=-1): |
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295 self.filename = filename |
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296 self.lineno = lineno |
163
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297 self.tokens = filter(None, [dqstr or sqstr or number or token or name |
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298 for dqstr, sqstr, number, token, name in |
155
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299 self._tokenize(text)]) |
106
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300 self.pos = 0 |
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301 |
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302 # Tokenizer |
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303 |
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304 at_end = property(lambda self: self.pos == len(self.tokens) - 1) |
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305 cur_token = property(lambda self: self.tokens[self.pos]) |
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306 |
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307 def next_token(self): |
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308 self.pos += 1 |
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309 return self.tokens[self.pos] |
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310 |
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311 def peek_token(self): |
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312 if not self.at_end: |
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313 return self.tokens[self.pos + 1] |
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314 return None |
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315 |
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316 # Recursive descent parser |
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317 |
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318 def parse(self): |
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319 """Parses the XPath expression and returns a list of location path |
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320 tests. |
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321 |
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322 For union expressions (such as `*|text()`), this function returns one |
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323 test for each operand in the union. For patch expressions that don't |
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324 use the union operator, the function always returns a list of size 1. |
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325 |
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326 Each path test in turn is a sequence of tests that correspond to the |
111
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327 location steps, each tuples of the form `(axis, testfunc, predicates)` |
106
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328 """ |
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329 paths = [self._location_path()] |
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330 while self.cur_token == '|': |
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331 self.next_token() |
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332 paths.append(self._location_path()) |
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333 if not self.at_end: |
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334 raise PathSyntaxError('Unexpected token %r after end of expression' |
139
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335 % self.cur_token, self.filename, self.lineno) |
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336 return paths |
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337 |
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338 def _location_path(self): |
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339 steps = [] |
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340 while True: |
215 | 341 if self.cur_token.startswith('/'): |
342 if self.cur_token == '//': | |
343 steps.append((DESCENDANT_OR_SELF, NodeTest(), [])) | |
344 elif not steps: | |
345 raise PathSyntaxError('Absolute location paths not ' | |
346 'supported', self.filename, | |
347 self.lineno) | |
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348 self.next_token() |
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349 |
137 | 350 axis, nodetest, predicates = self._location_step() |
351 if not axis: | |
145
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352 axis = CHILD |
137 | 353 steps.append((axis, nodetest, predicates)) |
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354 |
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355 if self.at_end or not self.cur_token.startswith('/'): |
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356 break |
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357 |
106
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358 return steps |
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359 |
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360 def _location_step(self): |
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361 if self.cur_token == '@': |
114 | 362 axis = ATTRIBUTE |
106
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363 self.next_token() |
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364 elif self.cur_token == '.': |
114 | 365 axis = SELF |
137 | 366 elif self.cur_token == '..': |
139
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367 raise PathSyntaxError('Unsupported axis "parent"', self.filename, |
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368 self.lineno) |
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369 elif self.peek_token() == '::': |
114 | 370 axis = Axis.forname(self.cur_token) |
371 if axis is None: | |
139
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372 raise PathSyntaxError('Unsupport axis "%s"' % axis, |
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373 self.filename, self.lineno) |
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374 self.next_token() |
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375 self.next_token() |
106
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376 else: |
137 | 377 axis = None |
378 nodetest = self._node_test(axis or CHILD) | |
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379 predicates = [] |
106
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380 while self.cur_token == '[': |
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381 predicates.append(self._predicate()) |
137 | 382 return axis, nodetest, predicates |
106
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383 |
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384 def _node_test(self, axis=None): |
224
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385 test = prefix = None |
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386 next_token = self.peek_token() |
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387 if next_token in ('(', '()'): # Node type test |
106
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388 test = self._node_type() |
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389 |
224
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390 elif next_token == ':': # Namespace prefix |
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391 prefix = self.cur_token |
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392 self.next_token() |
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393 localname = self.next_token() |
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394 if localname == '*': |
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395 test = QualifiedPrincipalTypeTest(axis, prefix) |
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|
396 else: |
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397 test = QualifiedNameTest(axis, prefix, localname) |
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398 |
106
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399 else: # Name test |
137 | 400 if self.cur_token == '*': |
401 test = PrincipalTypeTest(axis) | |
402 elif self.cur_token == '.': | |
403 test = NodeTest() | |
106
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404 else: |
137 | 405 test = LocalNameTest(axis, self.cur_token) |
106
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406 |
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407 if not self.at_end: |
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|
408 self.next_token() |
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|
409 return test |
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|
410 |
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411 def _node_type(self): |
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|
412 name = self.cur_token |
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|
413 self.next_token() |
137 | 414 |
415 args = [] | |
416 if self.cur_token != '()': | |
417 # The processing-instruction() function optionally accepts the | |
418 # name of the PI as argument, which must be a literal string | |
419 self.next_token() # ( | |
420 if self.cur_token != ')': | |
421 string = self.cur_token | |
422 if (string[0], string[-1]) in self._QUOTES: | |
423 string = string[1:-1] | |
424 args.append(string) | |
425 | |
426 cls = _nodetest_map.get(name) | |
427 if not cls: | |
139
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428 raise PathSyntaxError('%s() not allowed here' % name, self.filename, |
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429 self.lineno) |
137 | 430 return cls(*args) |
106
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|
431 |
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|
432 def _predicate(self): |
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433 assert self.cur_token == '[' |
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|
434 self.next_token() |
111
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|
435 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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|
436 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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|
437 raise PathSyntaxError('Expected "]" to close predicate, ' |
139
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|
438 'but found "%s"' % self.cur_token, |
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|
439 self.filename, self.lineno) |
111
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|
440 if not self.at_end: |
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|
441 self.next_token() |
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|
442 return expr |
106
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|
443 |
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|
444 def _or_expr(self): |
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|
445 expr = self._and_expr() |
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|
446 while self.cur_token == 'or': |
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447 self.next_token() |
137 | 448 expr = OrOperator(expr, self._and_expr()) |
106
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|
449 return expr |
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|
450 |
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|
451 def _and_expr(self): |
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|
452 expr = self._equality_expr() |
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453 while self.cur_token == 'and': |
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454 self.next_token() |
137 | 455 expr = AndOperator(expr, self._equality_expr()) |
106
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|
456 return expr |
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|
457 |
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|
458 def _equality_expr(self): |
162
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diff
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|
459 expr = self._relational_expr() |
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460 while self.cur_token in ('=', '!='): |
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461 op = _operator_map[self.cur_token] |
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462 self.next_token() |
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|
463 expr = op(expr, self._relational_expr()) |
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464 return expr |
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|
465 |
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|
466 def _relational_expr(self): |
106
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467 expr = self._primary_expr() |
162
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|
468 while self.cur_token in ('>', '>=', '<', '>='): |
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469 op = _operator_map[self.cur_token] |
106
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470 self.next_token() |
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471 expr = op(expr, self._primary_expr()) |
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472 return expr |
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|
473 |
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|
474 def _primary_expr(self): |
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|
475 token = self.cur_token |
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|
476 if len(token) > 1 and (token[0], token[-1]) in self._QUOTES: |
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477 self.next_token() |
137 | 478 return StringLiteral(token[1:-1]) |
163
9df6f057efd3
Support for XPath number literals including decimal places.
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|
479 elif token[0].isdigit() or token[0] == '.': |
106
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|
480 self.next_token() |
137 | 481 return NumberLiteral(float(token)) |
179
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482 elif token == '$': |
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483 token = self.next_token() |
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484 self.next_token() |
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485 return VariableReference(token) |
121
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486 elif not self.at_end and self.peek_token().startswith('('): |
155
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487 return self._function_call() |
106
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488 else: |
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489 axis = None |
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490 if token == '@': |
114 | 491 axis = ATTRIBUTE |
106
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492 self.next_token() |
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493 return self._node_test(axis) |
137 | 494 |
155
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495 def _function_call(self): |
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496 name = self.cur_token |
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497 if self.next_token() == '()': |
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498 args = [] |
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499 else: |
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500 assert self.cur_token == '(' |
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501 self.next_token() |
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502 args = [self._or_expr()] |
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503 while self.cur_token == ',': |
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504 self.next_token() |
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505 args.append(self._or_expr()) |
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506 if not self.cur_token == ')': |
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507 raise PathSyntaxError('Expected ")" to close function argument ' |
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508 'list, but found "%s"' % self.cur_token, |
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509 self.filename, self.lineno) |
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510 self.next_token() |
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511 cls = _function_map.get(name) |
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512 if not cls: |
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513 raise PathSyntaxError('Unsupported function "%s"' % name, |
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514 self.filename, self.lineno) |
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515 return cls(*args) |
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516 |
137 | 517 |
518 # Node tests | |
519 | |
520 class PrincipalTypeTest(object): | |
161
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521 """Node test that matches any event with the given principal type.""" |
137 | 522 __slots__ = ['principal_type'] |
523 def __init__(self, principal_type): | |
524 self.principal_type = principal_type | |
224
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525 def __call__(self, kind, data, pos, namespaces, variables): |
137 | 526 if kind is START: |
527 if self.principal_type is ATTRIBUTE: | |
528 return data[1] or None | |
529 else: | |
530 return True | |
531 def __repr__(self): | |
532 return '*' | |
533 | |
224
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534 class QualifiedPrincipalTypeTest(object): |
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535 """Node test that matches any event with the given principal type in a |
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536 specific namespace.""" |
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537 __slots__ = ['principal_type', 'prefix'] |
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538 def __init__(self, principal_type, prefix): |
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539 self.principal_type = principal_type |
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540 self.prefix = prefix |
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541 def __call__(self, kind, data, pos, namespaces, variables): |
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542 namespace = Namespace(namespaces.get(self.prefix)) |
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543 if kind is START: |
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544 if self.principal_type is ATTRIBUTE and data[1]: |
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545 return Attrs([(name, value) for name, value in data[1] |
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546 if name in namespace]) or None |
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547 else: |
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548 return data[0] in namespace |
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549 def __repr__(self): |
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550 return '%s:*' % self.prefix |
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551 |
137 | 552 class LocalNameTest(object): |
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553 """Node test that matches any event with the given prinipal type and |
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554 local name. |
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555 """ |
137 | 556 __slots__ = ['principal_type', 'name'] |
557 def __init__(self, principal_type, name): | |
558 self.principal_type = principal_type | |
559 self.name = name | |
224
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560 def __call__(self, kind, data, pos, namespaces, variables): |
137 | 561 if kind is START: |
562 if self.principal_type is ATTRIBUTE and self.name in data[1]: | |
234 | 563 return data[1].get(self.name) |
137 | 564 else: |
565 return data[0].localname == self.name | |
566 def __repr__(self): | |
567 return self.name | |
568 | |
224
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569 class QualifiedNameTest(object): |
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570 """Node test that matches any event with the given prinipal type and |
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571 qualified name. |
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572 """ |
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573 __slots__ = ['principal_type', 'prefix', 'name'] |
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574 def __init__(self, principal_type, prefix, name): |
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575 self.principal_type = principal_type |
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576 self.prefix = prefix |
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577 self.name = name |
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578 def __call__(self, kind, data, pos, namespaces, variables): |
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579 qname = QName('%s}%s' % (namespaces.get(self.prefix), self.name)) |
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580 if kind is START: |
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581 if self.principal_type is ATTRIBUTE and qname in data[1]: |
234 | 582 return data[1].get(qname) |
224
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583 else: |
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584 return data[0] == qname |
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585 def __repr__(self): |
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586 return '%s:%s' % (self.prefix, self.name) |
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587 |
137 | 588 class CommentNodeTest(object): |
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589 """Node test that matches any comment events.""" |
137 | 590 __slots__ = [] |
224
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591 def __call__(self, kind, data, pos, namespaces, variables): |
137 | 592 return kind is COMMENT and (kind, data, pos) |
593 def __repr__(self): | |
594 return 'comment()' | |
595 | |
596 class NodeTest(object): | |
161
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597 """Node test that matches any node.""" |
137 | 598 __slots__ = [] |
224
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599 def __call__(self, kind, data, pos, namespaces, variables): |
137 | 600 if kind is START: |
601 return True | |
602 return kind, data, pos | |
603 def __repr__(self): | |
604 return 'node()' | |
605 | |
606 class ProcessingInstructionNodeTest(object): | |
161
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607 """Node test that matches any processing instruction event.""" |
137 | 608 __slots__ = ['target'] |
609 def __init__(self, target=None): | |
610 self.target = target | |
224
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611 def __call__(self, kind, data, pos, namespaces, variables): |
137 | 612 if kind is PI and (not self.target or data[0] == self.target): |
613 return (kind, data, pos) | |
614 def __repr__(self): | |
615 arg = '' | |
616 if self.target: | |
617 arg = '"' + self.target + '"' | |
618 return 'processing-instruction(%s)' % arg | |
619 | |
620 class TextNodeTest(object): | |
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621 """Node test that matches any text event.""" |
137 | 622 __slots__ = [] |
224
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623 def __call__(self, kind, data, pos, namespaces, variables): |
137 | 624 return kind is TEXT and (kind, data, pos) |
625 def __repr__(self): | |
626 return 'text()' | |
627 | |
628 _nodetest_map = {'comment': CommentNodeTest, 'node': NodeTest, | |
629 'processing-instruction': ProcessingInstructionNodeTest, | |
630 'text': TextNodeTest} | |
631 | |
632 # Functions | |
633 | |
155
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634 class Function(object): |
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635 """Base class for function nodes in XPath expressions.""" |
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636 |
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637 class BooleanFunction(Function): |
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638 """The `boolean` function, which converts its argument to a boolean |
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639 value. |
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640 """ |
155
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641 __slots__ = ['expr'] |
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642 def __init__(self, expr): |
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643 self.expr = expr |
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644 def __call__(self, kind, data, pos, namespaces, variables): |
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645 val = self.expr(kind, data, pos, namespaces, variables) |
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646 return bool(val) |
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647 def __repr__(self): |
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648 return 'boolean(%r)' % self.expr |
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649 |
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650 class CeilingFunction(Function): |
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651 """The `ceiling` function, which returns the nearest lower integer number |
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652 for the given number. |
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653 """ |
155
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654 __slots__ = ['number'] |
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655 def __init__(self, number): |
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656 self.number = number |
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657 def __call__(self, kind, data, pos, namespaces, variables): |
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658 number = self.number(kind, data, pos, namespaces, variables) |
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659 return ceil(float(number)) |
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660 def __repr__(self): |
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661 return 'ceiling(%r)' % self.number |
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662 |
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663 class ConcatFunction(Function): |
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664 """The `concat` function, which concatenates (joins) the variable number of |
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665 strings it gets as arguments. |
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666 """ |
155
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667 __slots__ = ['exprs'] |
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668 def __init__(self, *exprs): |
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669 self.exprs = exprs |
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670 def __call__(self, kind, data, pos, namespaces, variables): |
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671 strings = [] |
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672 for item in [expr(kind, data, pos, namespaces, variables) |
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673 for expr in self.exprs]: |
155
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674 strings.append(item) |
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675 return u''.join(strings) |
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676 def __repr__(self): |
169 | 677 return 'concat(%s)' % ', '.join([repr(expr) for expr in self.exprs]) |
155
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678 |
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679 class ContainsFunction(Function): |
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680 """The `contains` function, which returns whether a string contains a given |
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681 substring. |
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682 """ |
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683 __slots__ = ['string1', 'string2'] |
155
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684 def __init__(self, string1, string2): |
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685 self.string1 = string1 |
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686 self.string2 = string2 |
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687 def __call__(self, kind, data, pos, namespaces, variables): |
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688 string1 = self.string1(kind, data, pos, namespaces, variables) |
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689 string2 = self.string2(kind, data, pos, namespaces, variables) |
155
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690 return string2 in string1 |
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691 def __repr__(self): |
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692 return 'contains(%r, %r)' % (self.string1, self.string2) |
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693 |
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694 class FalseFunction(Function): |
161
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695 """The `false` function, which always returns the boolean `false` value.""" |
155
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696 __slots__ = [] |
224
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697 def __call__(self, kind, data, pos, namespaces, variables): |
155
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698 return False |
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|
699 def __repr__(self): |
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|
700 return 'false()' |
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701 |
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702 class FloorFunction(Function): |
161
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703 """The `ceiling` function, which returns the nearest higher integer number |
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|
704 for the given number. |
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|
705 """ |
155
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706 __slots__ = ['number'] |
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|
707 def __init__(self, number): |
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|
708 self.number = number |
224
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709 def __call__(self, kind, data, pos, namespaces, variables): |
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710 number = self.number(kind, data, pos, namespaces, variables) |
155
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711 return floor(float(number)) |
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|
712 def __repr__(self): |
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|
713 return 'floor(%r)' % self.number |
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|
714 |
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715 class LocalNameFunction(Function): |
161
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716 """The `local-name` function, which returns the local name of the current |
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|
717 element. |
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|
718 """ |
137 | 719 __slots__ = [] |
224
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720 def __call__(self, kind, data, pos, namespaces, variables): |
137 | 721 if kind is START: |
234 | 722 return data[0].localname |
137 | 723 def __repr__(self): |
724 return 'local-name()' | |
725 | |
155
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726 class NameFunction(Function): |
161
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727 """The `name` function, which returns the qualified name of the current |
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|
728 element. |
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|
729 """ |
137 | 730 __slots__ = [] |
224
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731 def __call__(self, kind, data, pos, namespaces, variables): |
137 | 732 if kind is START: |
234 | 733 return data[0] |
137 | 734 def __repr__(self): |
735 return 'name()' | |
736 | |
155
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737 class NamespaceUriFunction(Function): |
161
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738 """The `namespace-uri` function, which returns the namespace URI of the |
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|
739 current element. |
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|
740 """ |
137 | 741 __slots__ = [] |
224
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742 def __call__(self, kind, data, pos, namespaces, variables): |
137 | 743 if kind is START: |
234 | 744 return data[0].namespace |
137 | 745 def __repr__(self): |
746 return 'namespace-uri()' | |
747 | |
155
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748 class NotFunction(Function): |
161
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|
749 """The `not` function, which returns the negated boolean value of its |
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|
750 argument. |
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|
751 """ |
137 | 752 __slots__ = ['expr'] |
753 def __init__(self, expr): | |
754 self.expr = expr | |
224
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755 def __call__(self, kind, data, pos, namespaces, variables): |
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756 return not self.expr(kind, data, pos, namespaces, variables) |
137 | 757 def __repr__(self): |
758 return 'not(%s)' % self.expr | |
759 | |
155
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760 class NormalizeSpaceFunction(Function): |
161
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|
761 """The `normalize-space` function, which removes leading and trailing |
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|
762 whitespace in the given string, and replaces multiple adjacent whitespace |
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|
763 characters inside the string with a single space. |
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|
764 """ |
155
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|
765 __slots__ = ['expr'] |
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|
766 _normalize = re.compile(r'\s{2,}').sub |
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767 def __init__(self, expr): |
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|
768 self.expr = expr |
224
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769 def __call__(self, kind, data, pos, namespaces, variables): |
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770 string = self.expr(kind, data, pos, namespaces, variables) |
155
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771 return self._normalize(' ', string.strip()) |
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772 def __repr__(self): |
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|
773 return 'normalize-space(%s)' % repr(self.expr) |
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774 |
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|
775 class NumberFunction(Function): |
161
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|
776 """The `number` function that converts its argument to a number.""" |
155
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777 __slots__ = ['expr'] |
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|
778 def __init__(self, expr): |
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|
779 self.expr = expr |
224
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780 def __call__(self, kind, data, pos, namespaces, variables): |
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781 val = self.expr(kind, data, pos, namespaces, variables) |
155
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782 return float(val) |
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|
783 def __repr__(self): |
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|
784 return 'number(%r)' % self.expr |
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|
785 |
162
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|
786 class RoundFunction(Function): |
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|
787 """The `round` function, which returns the nearest integer number for the |
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|
788 given number. |
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|
789 """ |
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|
790 __slots__ = ['number'] |
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|
791 def __init__(self, number): |
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|
792 self.number = number |
224
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793 def __call__(self, kind, data, pos, namespaces, variables): |
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|
794 number = self.number(kind, data, pos, namespaces, variables) |
162
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|
795 return round(float(number)) |
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|
796 def __repr__(self): |
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|
797 return 'round(%r)' % self.number |
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|
798 |
155
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|
799 class StartsWithFunction(Function): |
161
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|
800 """The `starts-with` function that returns whether one string starts with |
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|
801 a given substring. |
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|
802 """ |
155
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|
803 __slots__ = ['string1', 'string2'] |
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|
804 def __init__(self, string1, string2): |
284
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|
805 self.string1 = string1 |
155
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|
806 self.string2 = string2 |
224
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807 def __call__(self, kind, data, pos, namespaces, variables): |
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808 string1 = self.string1(kind, data, pos, namespaces, variables) |
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809 string2 = self.string2(kind, data, pos, namespaces, variables) |
155
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810 return string1.startswith(string2) |
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|
811 def __repr__(self): |
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|
812 return 'starts-with(%r, %r)' % (self.string1, self.string2) |
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|
813 |
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|
814 class StringLengthFunction(Function): |
161
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|
815 """The `string-length` function that returns the length of the given |
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|
816 string. |
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|
817 """ |
155
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|
818 __slots__ = ['expr'] |
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|
819 def __init__(self, expr): |
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|
820 self.expr = expr |
224
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821 def __call__(self, kind, data, pos, namespaces, variables): |
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822 string = self.expr(kind, data, pos, namespaces, variables) |
155
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823 return len(string) |
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824 def __repr__(self): |
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825 return 'string-length(%r)' % self.expr |
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826 |
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827 class SubstringFunction(Function): |
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828 """The `substring` function that returns the part of a string that starts |
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829 at the given offset, and optionally limited to the given length. |
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830 """ |
155
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831 __slots__ = ['string', 'start', 'length'] |
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832 def __init__(self, string, start, length=None): |
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833 self.string = string |
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834 self.start = start |
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835 self.length = length |
224
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836 def __call__(self, kind, data, pos, namespaces, variables): |
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837 string = self.string(kind, data, pos, namespaces, variables) |
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838 start = self.start(kind, data, pos, namespaces, variables) |
155
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839 length = 0 |
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840 if self.length is not None: |
224
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841 length = self.length(kind, data, pos, namespaces, variables) |
155
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842 return string[int(start):len(string) - int(length)] |
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843 def __repr__(self): |
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844 if self.length is not None: |
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845 return 'substring(%r, %r, %r)' % (self.string, self.start, |
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846 self.length) |
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847 else: |
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848 return 'substring(%r, %r)' % (self.string, self.start) |
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849 |
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850 class SubstringAfterFunction(Function): |
161
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851 """The `substring-after` function that returns the part of a string that |
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852 is found after the given substring. |
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853 """ |
155
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854 __slots__ = ['string1', 'string2'] |
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855 def __init__(self, string1, string2): |
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856 self.string1 = string1 |
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857 self.string2 = string2 |
224
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858 def __call__(self, kind, data, pos, namespaces, variables): |
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859 string1 = self.string1(kind, data, pos, namespaces, variables) |
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860 string2 = self.string2(kind, data, pos, namespaces, variables) |
155
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|
861 index = string1.find(string2) |
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|
862 if index >= 0: |
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863 return string1[index + len(string2):] |
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|
864 return u'' |
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|
865 def __repr__(self): |
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|
866 return 'substring-after(%r, %r)' % (self.string1, self.string2) |
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|
867 |
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|
868 class SubstringBeforeFunction(Function): |
161
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869 """The `substring-before` function that returns the part of a string that |
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|
870 is found before the given substring. |
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|
871 """ |
155
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|
872 __slots__ = ['string1', 'string2'] |
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873 def __init__(self, string1, string2): |
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|
874 self.string1 = string1 |
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|
875 self.string2 = string2 |
224
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|
876 def __call__(self, kind, data, pos, namespaces, variables): |
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877 string1 = self.string1(kind, data, pos, namespaces, variables) |
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878 string2 = self.string2(kind, data, pos, namespaces, variables) |
155
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|
879 index = string1.find(string2) |
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|
880 if index >= 0: |
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|
881 return string1[:index] |
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|
882 return u'' |
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diff
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|
883 def __repr__(self): |
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|
884 return 'substring-after(%r, %r)' % (self.string1, self.string2) |
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|
885 |
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|
886 class TranslateFunction(Function): |
161
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|
887 """The `translate` function that translates a set of characters in a |
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|
888 string to target set of characters. |
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|
889 """ |
155
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|
890 __slots__ = ['string', 'fromchars', 'tochars'] |
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|
891 def __init__(self, string, fromchars, tochars): |
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|
892 self.string = string |
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|
893 self.fromchars = fromchars |
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|
894 self.tochars = tochars |
224
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|
895 def __call__(self, kind, data, pos, namespaces, variables): |
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|
896 string = self.string(kind, data, pos, namespaces, variables) |
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|
897 fromchars = self.fromchars(kind, data, pos, namespaces, variables) |
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|
898 tochars = self.tochars(kind, data, pos, namespaces, variables) |
155
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|
899 table = dict(zip([ord(c) for c in fromchars], |
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|
900 [ord(c) for c in tochars])) |
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|
901 return string.translate(table) |
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diff
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|
902 def __repr__(self): |
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|
903 return 'translate(%r, %r, %r)' % (self.string, self.fromchars, |
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|
904 self.tochars) |
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diff
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|
905 |
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diff
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|
906 class TrueFunction(Function): |
161
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|
907 """The `true` function, which always returns the boolean `true` value.""" |
155
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diff
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|
908 __slots__ = [] |
224
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|
909 def __call__(self, kind, data, pos, namespaces, variables): |
155
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|
910 return True |
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diff
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|
911 def __repr__(self): |
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diff
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|
912 return 'true()' |
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diff
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|
913 |
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|
914 _function_map = {'boolean': BooleanFunction, 'ceiling': CeilingFunction, |
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|
915 'concat': ConcatFunction, 'contains': ContainsFunction, |
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|
916 'false': FalseFunction, 'floor': FloorFunction, |
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|
917 'local-name': LocalNameFunction, 'name': NameFunction, |
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|
918 'namespace-uri': NamespaceUriFunction, |
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|
919 'normalize-space': NormalizeSpaceFunction, 'not': NotFunction, |
162
f767cf98e3e3
Implement the XPath relational operators and the `round()` function.
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diff
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|
920 'number': NumberFunction, 'round': RoundFunction, |
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|
921 'starts-with': StartsWithFunction, |
155
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|
922 'string-length': StringLengthFunction, |
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diff
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|
923 'substring': SubstringFunction, |
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diff
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|
924 'substring-after': SubstringAfterFunction, |
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diff
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|
925 'substring-before': SubstringBeforeFunction, |
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|
926 'translate': TranslateFunction, 'true': TrueFunction} |
137 | 927 |
179
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|
928 # Literals & Variables |
137 | 929 |
155
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|
930 class Literal(object): |
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|
931 """Abstract base class for literal nodes.""" |
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|
932 |
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|
933 class StringLiteral(Literal): |
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|
934 """A string literal node.""" |
137 | 935 __slots__ = ['text'] |
936 def __init__(self, text): | |
937 self.text = text | |
224
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938 def __call__(self, kind, data, pos, namespaces, variables): |
228
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|
939 return self.text |
137 | 940 def __repr__(self): |
941 return '"%s"' % self.text | |
942 | |
155
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|
943 class NumberLiteral(Literal): |
161
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|
944 """A number literal node.""" |
137 | 945 __slots__ = ['number'] |
946 def __init__(self, number): | |
947 self.number = number | |
224
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|
948 def __call__(self, kind, data, pos, namespaces, variables): |
228
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|
949 return self.number |
137 | 950 def __repr__(self): |
951 return str(self.number) | |
952 | |
179
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|
953 class VariableReference(Literal): |
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|
954 """A variable reference node.""" |
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|
955 __slots__ = ['name'] |
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|
956 def __init__(self, name): |
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|
957 self.name = name |
224
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|
958 def __call__(self, kind, data, pos, namespaces, variables): |
228
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|
959 return variables.get(self.name) |
179
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|
960 def __repr__(self): |
215 | 961 return str(self.name) |
179
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|
962 |
137 | 963 # Operators |
964 | |
965 class AndOperator(object): | |
161
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|
966 """The boolean operator `and`.""" |
137 | 967 __slots__ = ['lval', 'rval'] |
968 def __init__(self, lval, rval): | |
969 self.lval = lval | |
970 self.rval = rval | |
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971 def __call__(self, kind, data, pos, namespaces, variables): |
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972 lval = self.lval(kind, data, pos, namespaces, variables) |
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973 if not lval: |
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974 return False |
224
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975 rval = self.rval(kind, data, pos, namespaces, variables) |
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976 return bool(rval) |
137 | 977 def __repr__(self): |
161
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978 return '%s and %s' % (self.lval, self.rval) |
137 | 979 |
161
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980 class EqualsOperator(object): |
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981 """The equality operator `=`.""" |
137 | 982 __slots__ = ['lval', 'rval'] |
983 def __init__(self, lval, rval): | |
984 self.lval = lval | |
985 self.rval = rval | |
224
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986 def __call__(self, kind, data, pos, namespaces, variables): |
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987 lval = self.lval(kind, data, pos, namespaces, variables) |
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988 rval = self.rval(kind, data, pos, namespaces, variables) |
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989 return lval == rval |
137 | 990 def __repr__(self): |
161
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991 return '%s=%s' % (self.lval, self.rval) |
137 | 992 |
161
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993 class NotEqualsOperator(object): |
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994 """The equality operator `!=`.""" |
137 | 995 __slots__ = ['lval', 'rval'] |
996 def __init__(self, lval, rval): | |
997 self.lval = lval | |
998 self.rval = rval | |
224
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999 def __call__(self, kind, data, pos, namespaces, variables): |
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1000 lval = self.lval(kind, data, pos, namespaces, variables) |
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1001 rval = self.rval(kind, data, pos, namespaces, variables) |
161
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1002 return lval != rval |
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1003 def __repr__(self): |
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1004 return '%s!=%s' % (self.lval, self.rval) |
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1005 |
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1006 class OrOperator(object): |
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1007 """The boolean operator `or`.""" |
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1008 __slots__ = ['lval', 'rval'] |
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1009 def __init__(self, lval, rval): |
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1010 self.lval = lval |
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1011 self.rval = rval |
224
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1012 def __call__(self, kind, data, pos, namespaces, variables): |
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1013 lval = self.lval(kind, data, pos, namespaces, variables) |
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1014 if lval: |
137 | 1015 return True |
224
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1016 rval = self.rval(kind, data, pos, namespaces, variables) |
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1017 return bool(rval) |
137 | 1018 def __repr__(self): |
1019 return '%s or %s' % (self.lval, self.rval) | |
1020 | |
162
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1021 class GreaterThanOperator(object): |
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1022 """The relational operator `>` (greater than).""" |
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1023 __slots__ = ['lval', 'rval'] |
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1024 def __init__(self, lval, rval): |
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1025 self.lval = lval |
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1026 self.rval = rval |
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1027 def __call__(self, kind, data, pos, namespaces, variables): |
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1028 lval = self.lval(kind, data, pos, namespaces, variables) |
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1029 rval = self.rval(kind, data, pos, namespaces, variables) |
162
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1030 return float(lval) > float(rval) |
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1031 def __repr__(self): |
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1032 return '%s>%s' % (self.lval, self.rval) |
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1033 |
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1034 class GreaterThanOrEqualOperator(object): |
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1035 """The relational operator `>=` (greater than or equal).""" |
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1036 __slots__ = ['lval', 'rval'] |
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1037 def __init__(self, lval, rval): |
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1038 self.lval = lval |
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1039 self.rval = rval |
224
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1040 def __call__(self, kind, data, pos, namespaces, variables): |
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1041 lval = self.lval(kind, data, pos, namespaces, variables) |
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1042 rval = self.rval(kind, data, pos, namespaces, variables) |
162
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1043 return float(lval) >= float(rval) |
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1044 def __repr__(self): |
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1045 return '%s>=%s' % (self.lval, self.rval) |
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1046 |
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1047 class LessThanOperator(object): |
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1048 """The relational operator `<` (less than).""" |
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1049 __slots__ = ['lval', 'rval'] |
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1050 def __init__(self, lval, rval): |
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1051 self.lval = lval |
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1052 self.rval = rval |
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1053 def __call__(self, kind, data, pos, namespaces, variables): |
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1054 lval = self.lval(kind, data, pos, namespaces, variables) |
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1055 rval = self.rval(kind, data, pos, namespaces, variables) |
162
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1056 return float(lval) < float(rval) |
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1057 def __repr__(self): |
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1058 return '%s<%s' % (self.lval, self.rval) |
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1059 |
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1060 class LessThanOrEqualOperator(object): |
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1061 """The relational operator `<=` (less than or equal).""" |
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1062 __slots__ = ['lval', 'rval'] |
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1063 def __init__(self, lval, rval): |
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1064 self.lval = lval |
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1065 self.rval = rval |
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1066 def __call__(self, kind, data, pos, namespaces, variables): |
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1067 lval = self.lval(kind, data, pos, namespaces, variables) |
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1068 rval = self.rval(kind, data, pos, namespaces, variables) |
162
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1069 return float(lval) <= float(rval) |
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1070 def __repr__(self): |
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1071 return '%s<=%s' % (self.lval, self.rval) |
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1072 |
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1073 _operator_map = {'=': EqualsOperator, '!=': NotEqualsOperator, |
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1074 '>': GreaterThanOperator, '>=': GreaterThanOrEqualOperator, |
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1075 '<': LessThanOperator, '>=': LessThanOrEqualOperator} |