Mercurial > genshi > mirror
annotate markup/path.py @ 61:448792ab1303 trunk
Use a different namespace than Kid uses.
| author | cmlenz |
|---|---|
| date | Fri, 07 Jul 2006 17:54:52 +0000 |
| parents | ee669cb9cccc |
| children | 59eb24184e9c |
| rev | line source |
|---|---|
| 1 | 1 # -*- coding: utf-8 -*- |
| 2 # | |
| 27 | 3 # Copyright (C) 2006 Christopher Lenz |
| 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 | |
| 27 | 8 # are also available at http://markup.cmlenz.net/wiki/License. |
| 1 | 9 # |
| 10 # This software consists of voluntary contributions made by many | |
| 11 # individuals. For the exact contribution history, see the revision | |
| 27 | 12 # history and logs, available at http://markup.cmlenz.net/log/. |
| 1 | 13 |
| 14 """Basic support for evaluating XPath expressions against streams.""" | |
| 15 | |
| 16 import re | |
| 17 | |
| 18 from markup.core import QName, Stream | |
| 19 | |
| 20 __all__ = ['Path'] | |
| 21 | |
| 22 | |
| 23 class Path(object): | |
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24 """Implements basic XPath support on streams. |
| 1 | 25 |
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26 Instances of this class represent a "compiled" XPath expression, and provide |
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27 methods for testing the path against a stream, as well as extracting a |
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28 substream matching that path. |
| 1 | 29 """ |
| 30 _TOKEN_RE = re.compile('(::|\.\.|\(\)|[/.:\[\]\(\)@=!])|' | |
| 31 '([^/:\[\]\(\)@=!\s]+)|' | |
| 32 '\s+') | |
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33 _QUOTES = (("'", "'"), ('"', '"')) |
| 1 | 34 |
| 35 def __init__(self, text): | |
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36 """Create the path object from a string. |
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37 |
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38 @param text: the path expression |
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39 """ |
| 1 | 40 self.source = text |
| 41 | |
| 42 steps = [] | |
| 43 cur_op = '' | |
| 44 cur_tag = '' | |
| 45 in_predicate = False | |
| 46 for op, tag in self._TOKEN_RE.findall(text): | |
| 47 if op: | |
| 48 if op == '[': | |
| 49 in_predicate = True | |
| 50 elif op == ']': | |
| 51 in_predicate = False | |
| 52 elif op.startswith('('): | |
| 53 if cur_tag == 'text': | |
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54 steps[-1] = (False, self._FunctionText(), []) |
| 1 | 55 else: |
| 56 raise NotImplementedError('XPath function "%s" not ' | |
| 57 'supported' % cur_tag) | |
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58 elif op == '.': |
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59 steps.append([False, self._CurrentElement(), []]) |
| 1 | 60 else: |
| 61 cur_op += op | |
| 62 cur_tag = '' | |
| 63 else: | |
| 64 closure = cur_op in ('', '//') | |
| 65 if cur_op == '@': | |
| 66 if tag == '*': | |
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67 node_test = self._AnyAttribute() |
| 1 | 68 else: |
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69 node_test = self._AttributeByName(tag) |
| 1 | 70 else: |
| 71 if tag == '*': | |
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72 node_test = self._AnyChildElement() |
| 1 | 73 elif in_predicate: |
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74 if len(tag) > 1 and (tag[0], tag[-1]) in self._QUOTES: |
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75 node_test = self._LiteralString(tag[1:-1]) |
| 1 | 76 if cur_op == '=': |
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77 node_test = self._OperatorEq(steps[-1][2][-1], |
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78 node_test) |
| 1 | 79 steps[-1][2].pop() |
| 80 elif cur_op == '!=': | |
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81 node_test = self._OperatorNeq(steps[-1][2][-1], |
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82 node_test) |
| 1 | 83 steps[-1][2].pop() |
| 84 else: | |
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85 node_test = self._ChildElementByName(tag) |
| 1 | 86 if in_predicate: |
| 87 steps[-1][2].append(node_test) | |
| 88 else: | |
| 89 steps.append([closure, node_test, []]) | |
| 90 cur_op = '' | |
| 91 cur_tag = tag | |
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92 |
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93 self.steps = [] |
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94 for step in steps: |
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95 self.steps.append(tuple(step)) |
| 1 | 96 |
| 97 def __repr__(self): | |
| 98 return '<%s "%s">' % (self.__class__.__name__, self.source) | |
| 99 | |
| 100 def select(self, stream): | |
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101 """Returns a substream of the given stream that matches the path. |
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102 |
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103 If there are no matches, this method returns an empty stream. |
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104 |
| 33 | 105 >>> from markup.input import XML |
| 106 >>> xml = XML('<root><elem><child>Text</child></elem></root>') | |
| 61 | 107 |
| 33 | 108 >>> print Path('child').select(xml) |
| 109 <child>Text</child> | |
| 110 | |
| 111 >>> print Path('child/text()').select(xml) | |
| 112 Text | |
| 113 | |
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114 @param stream: the stream to select from |
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115 @return: the substream matching the path, or an empty stream |
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116 """ |
| 1 | 117 stream = iter(stream) |
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118 def _generate(): |
| 1 | 119 test = self.test() |
| 120 for kind, data, pos in stream: | |
| 121 result = test(kind, data, pos) | |
| 122 if result is True: | |
| 123 yield kind, data, pos | |
| 124 depth = 1 | |
| 125 while depth > 0: | |
| 126 ev = stream.next() | |
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127 depth += {Stream.START: 1, Stream.END: -1}.get(ev[0], 0) |
| 1 | 128 yield ev |
| 129 test(*ev) | |
| 130 elif result: | |
| 131 yield result | |
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132 return Stream(_generate()) |
| 1 | 133 |
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134 def test(self, ignore_context=False): |
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135 """Returns a function that can be used to track whether the path matches |
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136 a specific stream event. |
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137 |
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138 The function returned expects the positional arguments `kind`, `data`, |
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139 and `pos`, i.e. basically an unpacked stream event. If the path matches |
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140 the event, the function returns the match (for example, a `START` or |
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141 `TEXT` event.) Otherwise, it returns `None` or `False`. |
| 33 | 142 |
| 143 >>> from markup.input import XML | |
| 144 >>> xml = XML('<root><elem><child id="1"/></elem><child id="2"/></root>') | |
| 145 >>> test = Path('child').test() | |
| 146 >>> for kind, data, pos in xml: | |
| 147 ... if test(kind, data, pos): | |
| 148 ... print kind, data | |
| 149 START (u'child', [(u'id', u'1')]) | |
| 150 START (u'child', [(u'id', u'2')]) | |
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151 """ |
| 1 | 152 stack = [0] # stack of cursors into the location path |
| 153 | |
| 154 def _test(kind, data, pos): | |
| 155 if not stack: | |
| 156 return False | |
| 157 | |
| 158 if kind is Stream.END: | |
| 159 stack.pop() | |
| 160 return None | |
| 161 | |
| 162 if kind is Stream.START: | |
| 163 stack.append(stack[-1]) | |
| 164 | |
| 165 matched = False | |
| 166 closure, node_test, predicates = self.steps[stack[-1]] | |
| 167 | |
| 168 matched = node_test(kind, data, pos) | |
| 169 if matched and predicates: | |
| 170 for predicate in predicates: | |
| 171 if not predicate(kind, data, pos): | |
| 172 matched = None | |
| 173 break | |
| 174 | |
| 175 if matched: | |
| 176 if stack[-1] == len(self.steps) - 1: | |
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177 if ignore_context or len(stack) > 2 \ |
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178 or node_test.axis != 'child': |
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179 return matched |
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180 else: |
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181 stack[-1] += 1 |
| 1 | 182 |
| 183 elif kind is Stream.START and not closure: | |
| 24 | 184 # If this step is not a closure, it cannot be matched until the |
| 185 # current element is closed... so we need to move the cursor | |
| 186 # back to the last closure and retest that against the current | |
| 187 # element | |
| 1 | 188 closures = [step for step in self.steps[:stack[-1]] if step[0]] |
| 25 | 189 closures.reverse() |
| 1 | 190 for closure, node_test, predicates in closures: |
| 191 stack[-1] -= 1 | |
| 192 if closure: | |
| 193 matched = node_test(kind, data, pos) | |
| 194 if matched: | |
| 195 stack[-1] += 1 | |
| 196 break | |
| 197 | |
| 198 return None | |
| 199 | |
| 200 return _test | |
| 201 | |
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202 class _NodeTest(object): |
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203 """Abstract node test.""" |
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204 axis = None |
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205 def __repr__(self): |
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206 return '<%s>' % self.__class__.__name__ |
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207 |
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208 class _CurrentElement(_NodeTest): |
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209 """Node test that matches the context node.""" |
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210 axis = 'self' |
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211 def __call__(self, kind, *_): |
| 1 | 212 if kind is Stream.START: |
| 213 return True | |
| 214 return None | |
| 215 | |
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216 class _AnyChildElement(_NodeTest): |
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217 """Node test that matches any child element.""" |
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218 axis = 'child' |
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219 def __call__(self, kind, *_): |
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220 if kind is Stream.START: |
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221 return True |
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222 return None |
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223 |
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224 class _ChildElementByName(_NodeTest): |
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225 """Node test that matches a child element with a specific tag name.""" |
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226 axis = 'child' |
| 1 | 227 def __init__(self, name): |
| 228 self.name = QName(name) | |
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229 def __call__(self, kind, data, _): |
| 1 | 230 if kind is Stream.START: |
| 231 return data[0].localname == self.name | |
| 232 return None | |
| 233 def __repr__(self): | |
| 234 return '<%s "%s">' % (self.__class__.__name__, self.name) | |
| 235 | |
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236 class _AnyAttribute(_NodeTest): |
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237 """Node test that matches any attribute.""" |
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238 axis = 'attribute' |
| 1 | 239 def __call__(self, kind, data, pos): |
| 240 if kind is Stream.START: | |
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241 text = ''.join([val for _, val in data[1]]) |
| 1 | 242 if text: |
| 243 return Stream.TEXT, text, pos | |
| 244 return None | |
| 245 return None | |
| 246 | |
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247 class _AttributeByName(_NodeTest): |
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248 """Node test that matches an attribute with a specific name.""" |
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249 axis = 'attribute' |
| 1 | 250 def __init__(self, name): |
| 251 self.name = QName(name) | |
| 252 def __call__(self, kind, data, pos): | |
| 253 if kind is Stream.START: | |
| 254 if self.name in data[1]: | |
| 255 return Stream.TEXT, data[1].get(self.name), pos | |
| 256 return None | |
| 257 return None | |
| 258 def __repr__(self): | |
| 259 return '<%s "%s">' % (self.__class__.__name__, self.name) | |
| 260 | |
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261 class _Function(_NodeTest): |
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262 """Abstract node test representing a function.""" |
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263 |
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264 class _FunctionText(_Function): |
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265 """Function that returns text content.""" |
| 1 | 266 def __call__(self, kind, data, pos): |
| 267 if kind is Stream.TEXT: | |
| 268 return kind, data, pos | |
| 269 return None | |
| 270 | |
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271 class _LiteralString(_NodeTest): |
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272 """Always returns a literal string.""" |
| 1 | 273 def __init__(self, value): |
| 274 self.value = value | |
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275 def __call__(self, *_): |
| 1 | 276 return Stream.TEXT, self.value, (-1, -1) |
| 277 | |
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278 class _OperatorEq(_NodeTest): |
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279 """Equality comparison operator.""" |
| 1 | 280 def __init__(self, lval, rval): |
| 281 self.lval = lval | |
| 282 self.rval = rval | |
| 283 def __call__(self, kind, data, pos): | |
| 284 lval = self.lval(kind, data, pos) | |
| 285 rval = self.rval(kind, data, pos) | |
| 286 return (lval and lval[1]) == (rval and rval[1]) | |
| 287 def __repr__(self): | |
| 288 return '<%s %r = %r>' % (self.__class__.__name__, self.lval, | |
| 289 self.rval) | |
| 290 | |
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291 class _OperatorNeq(_NodeTest): |
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292 """Inequality comparison operator.""" |
| 1 | 293 def __init__(self, lval, rval): |
| 294 self.lval = lval | |
| 295 self.rval = rval | |
| 296 def __call__(self, kind, data, pos): | |
| 297 lval = self.lval(kind, data, pos) | |
| 298 rval = self.rval(kind, data, pos) | |
| 299 return (lval and lval[1]) != (rval and rval[1]) | |
| 300 def __repr__(self): | |
| 301 return '<%s %r != %r>' % (self.__class__.__name__, self.lval, | |
| 302 self.rval) |