Mercurial > genshi > mirror
annotate genshi/path.py @ 1043:a21009a2bc3a trunk
Return correct value and properly namespaced attribute name when matching namespaced attributes with XPath expressions (fixes #572; thanks to Olemis Lang <olemis+trac@gmail.com> for bug report and suggestion for fix).
| author | hodgestar |
|---|---|
| date | Thu, 20 Mar 2014 12:58:48 +0000 |
| parents | 16d55698006a |
| children |
| rev | line source |
|---|---|
| 1 | 1 # -*- coding: utf-8 -*- |
| 2 # | |
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3 # Copyright (C) 2006-2009 Edgewall Software |
| 1 | 4 # All rights reserved. |
| 5 # | |
| 6 # This software is licensed as described in the file COPYING, which | |
| 7 # you should have received as part of this distribution. The terms | |
| 230 | 8 # are also available at http://genshi.edgewall.org/wiki/License. |
| 1 | 9 # |
| 10 # This software consists of voluntary contributions made by many | |
| 11 # individuals. For the exact contribution history, see the revision | |
| 230 | 12 # history and logs, available at http://genshi.edgewall.org/log/. |
| 1 | 13 |
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14 """Basic support for evaluating XPath expressions against streams. |
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15 |
| 230 | 16 >>> from genshi.input import XML |
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17 >>> doc = XML('''<doc> |
| 516 | 18 ... <items count="4"> |
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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> |
| 516 | 25 ... <item status="closed" resolution="invalid"> |
| 26 ... <summary>Baz</summary> | |
| 27 ... </item> | |
| 28 ... <item status="closed" resolution="fixed"> | |
| 29 ... <summary>Waz</summary> | |
| 30 ... </item> | |
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31 ... </items> |
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32 ... </doc>''') |
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33 >>> print(doc.select('items/item[@status="closed" and ' |
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34 ... '(@resolution="invalid" or not(@resolution))]/summary/text()')) |
| 516 | 35 BarBaz |
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36 |
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37 Because the XPath engine operates on markup streams (as opposed to tree |
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38 structures), it only implements a subset of the full XPath 1.0 language. |
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39 """ |
| 1 | 40 |
| 818 | 41 from collections import deque |
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42 try: |
| 856 | 43 reduce # builtin in Python < 3 |
| 44 except NameError: | |
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45 from functools import reduce |
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46 from math import ceil, floor |
| 593 | 47 import operator |
| 1 | 48 import re |
| 818 | 49 from itertools import chain |
| 1 | 50 |
| 230 | 51 from genshi.core import Stream, Attrs, Namespace, QName |
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52 from genshi.core import START, END, TEXT, START_NS, END_NS, COMMENT, PI, \ |
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53 START_CDATA, END_CDATA |
| 1 | 54 |
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55 __all__ = ['Path', 'PathSyntaxError'] |
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56 __docformat__ = 'restructuredtext en' |
| 1 | 57 |
| 58 | |
| 114 | 59 class Axis(object): |
| 60 """Defines constants for the various supported XPath axes.""" | |
| 61 | |
| 62 ATTRIBUTE = 'attribute' | |
| 63 CHILD = 'child' | |
| 64 DESCENDANT = 'descendant' | |
| 65 DESCENDANT_OR_SELF = 'descendant-or-self' | |
| 66 SELF = 'self' | |
| 67 | |
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68 @classmethod |
| 114 | 69 def forname(cls, name): |
| 70 """Return the axis constant for the given name, or `None` if no such | |
| 71 axis was defined. | |
| 72 """ | |
| 73 return getattr(cls, name.upper().replace('-', '_'), None) | |
| 74 | |
| 75 | |
| 76 ATTRIBUTE = Axis.ATTRIBUTE | |
| 77 CHILD = Axis.CHILD | |
| 78 DESCENDANT = Axis.DESCENDANT | |
| 79 DESCENDANT_OR_SELF = Axis.DESCENDANT_OR_SELF | |
| 80 SELF = Axis.SELF | |
| 81 | |
| 82 | |
| 818 | 83 class GenericStrategy(object): |
| 84 | |
| 85 @classmethod | |
| 86 def supports(cls, path): | |
| 87 return True | |
| 88 | |
| 89 def __init__(self, path): | |
| 90 self.path = path | |
| 91 | |
| 92 def test(self, ignore_context): | |
| 93 p = self.path | |
| 94 if ignore_context: | |
| 95 if p[0][0] is ATTRIBUTE: | |
| 96 steps = [_DOTSLASHSLASH] + p | |
| 97 else: | |
| 98 steps = [(DESCENDANT_OR_SELF, p[0][1], p[0][2])] + p[1:] | |
| 99 elif p[0][0] is CHILD or p[0][0] is ATTRIBUTE \ | |
| 100 or p[0][0] is DESCENDANT: | |
| 101 steps = [_DOTSLASH] + p | |
| 102 else: | |
| 103 steps = p | |
| 104 | |
| 105 # for node it contains all positions of xpath expression | |
| 106 # where its child should start checking for matches | |
| 107 # with list of corresponding context counters | |
| 108 # there can be many of them, because position that is from | |
| 109 # descendant-like axis can be achieved from different nodes | |
| 110 # for example <a><a><b/></a></a> should match both //a//b[1] | |
| 111 # and //a//b[2] | |
| 112 # positions always form increasing sequence (invariant) | |
| 113 stack = [[(0, [[]])]] | |
| 114 | |
| 115 def _test(event, namespaces, variables, updateonly=False): | |
| 116 kind, data, pos = event[:3] | |
| 117 retval = None | |
| 118 | |
| 119 # Manage the stack that tells us "where we are" in the stream | |
| 120 if kind is END: | |
| 121 if stack: | |
| 122 stack.pop() | |
| 123 return None | |
| 124 if kind is START_NS or kind is END_NS \ | |
| 125 or kind is START_CDATA or kind is END_CDATA: | |
| 126 # should we make namespaces work? | |
| 127 return None | |
| 128 | |
| 129 pos_queue = deque([(pos, cou, []) for pos, cou in stack[-1]]) | |
| 130 next_pos = [] | |
| 131 | |
| 132 # length of real part of path - we omit attribute axis | |
| 133 real_len = len(steps) - ((steps[-1][0] == ATTRIBUTE) or 1 and 0) | |
| 134 last_checked = -1 | |
| 135 | |
| 136 # places where we have to check for match, are these | |
| 137 # provided by parent | |
| 138 while pos_queue: | |
| 139 x, pcou, mcou = pos_queue.popleft() | |
| 140 axis, nodetest, predicates = steps[x] | |
| 141 | |
| 142 # we need to push descendant-like positions from parent | |
| 143 # further | |
| 144 if (axis is DESCENDANT or axis is DESCENDANT_OR_SELF) and pcou: | |
| 145 if next_pos and next_pos[-1][0] == x: | |
| 146 next_pos[-1][1].extend(pcou) | |
| 147 else: | |
| 148 next_pos.append((x, pcou)) | |
| 149 | |
| 150 # nodetest first | |
| 151 if not nodetest(kind, data, pos, namespaces, variables): | |
| 152 continue | |
| 153 | |
| 154 # counters packs that were already bad | |
| 155 missed = set() | |
| 156 counters_len = len(pcou) + len(mcou) | |
| 157 | |
| 158 # number of counters - we have to create one | |
| 159 # for every context position based predicate | |
| 160 cnum = 0 | |
| 161 | |
| 162 # tells if we have match with position x | |
| 163 matched = True | |
| 164 | |
| 165 if predicates: | |
| 166 for predicate in predicates: | |
| 167 pretval = predicate(kind, data, pos, | |
| 168 namespaces, | |
| 169 variables) | |
| 170 if type(pretval) is float: # FIXME <- need to check | |
| 171 # this for other types that | |
| 172 # can be coerced to float | |
| 173 | |
| 174 # each counter pack needs to be checked | |
| 175 for i, cou in enumerate(chain(pcou, mcou)): | |
| 176 # it was bad before | |
| 177 if i in missed: | |
| 178 continue | |
| 179 | |
| 180 if len(cou) < cnum + 1: | |
| 181 cou.append(0) | |
| 182 cou[cnum] += 1 | |
| 183 | |
| 184 # it is bad now | |
| 185 if cou[cnum] != int(pretval): | |
| 186 missed.add(i) | |
| 187 | |
| 188 # none of counters pack was good | |
| 189 if len(missed) == counters_len: | |
| 190 pretval = False | |
| 191 cnum += 1 | |
| 192 | |
| 193 if not pretval: | |
| 194 matched = False | |
| 195 break | |
| 196 | |
| 197 if not matched: | |
| 198 continue | |
| 199 | |
| 200 # counter for next position with current node as context node | |
| 201 child_counter = [] | |
| 202 | |
| 203 if x + 1 == real_len: | |
| 204 # we reached end of expression, because x + 1 | |
| 205 # is equal to the length of expression | |
| 206 matched = True | |
| 207 axis, nodetest, predicates = steps[-1] | |
| 208 if axis is ATTRIBUTE: | |
| 209 matched = nodetest(kind, data, pos, namespaces, | |
| 210 variables) | |
| 211 if matched: | |
| 212 retval = matched | |
| 213 else: | |
| 214 next_axis = steps[x + 1][0] | |
| 215 | |
| 216 # if next axis allows matching self we have | |
| 217 # to add next position to our queue | |
| 218 if next_axis is DESCENDANT_OR_SELF or next_axis is SELF: | |
| 219 if not pos_queue or pos_queue[0][0] > x + 1: | |
| 220 pos_queue.appendleft((x + 1, [], [child_counter])) | |
| 221 else: | |
| 222 pos_queue[0][2].append(child_counter) | |
| 223 | |
| 224 # if axis is not self we have to add it to child's list | |
| 225 if next_axis is not SELF: | |
| 226 next_pos.append((x + 1, [child_counter])) | |
| 227 | |
| 228 if kind is START: | |
| 229 stack.append(next_pos) | |
| 230 | |
| 231 return retval | |
| 232 | |
| 233 return _test | |
| 234 | |
| 235 | |
| 236 class SimplePathStrategy(object): | |
| 237 """Strategy for path with only local names, attributes and text nodes.""" | |
| 238 | |
| 239 @classmethod | |
| 240 def supports(cls, path): | |
| 241 if path[0][0] is ATTRIBUTE: | |
| 242 return False | |
| 243 allowed_tests = (LocalNameTest, CommentNodeTest, TextNodeTest) | |
| 244 for _, nodetest, predicates in path: | |
| 245 if predicates: | |
| 246 return False | |
| 247 if not isinstance(nodetest, allowed_tests): | |
| 248 return False | |
| 249 return True | |
| 250 | |
| 251 def __init__(self, path): | |
| 252 # fragments is list of tuples (fragment, pi, attr, self_beginning) | |
| 253 # fragment is list of nodetests for fragment of path with only | |
| 254 # child:: axes between | |
| 255 # pi is KMP partial match table for this fragment | |
| 256 # attr is attribute nodetest if fragment ends with @ and None otherwise | |
| 257 # self_beginning is True if axis for first fragment element | |
| 258 # was self (first fragment) or descendant-or-self (farther fragment) | |
| 259 self.fragments = [] | |
| 260 | |
| 261 self_beginning = False | |
| 262 fragment = [] | |
| 263 | |
| 264 def nodes_equal(node1, node2): | |
| 265 """Tests if two node tests are equal""" | |
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266 if type(node1) is not type(node2): |
| 818 | 267 return False |
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268 if type(node1) == LocalNameTest: |
| 818 | 269 return node1.name == node2.name |
| 270 return True | |
| 271 | |
| 272 def calculate_pi(f): | |
| 273 """KMP prefix calculation for table""" | |
| 274 # the indexes in prefix table are shifted by one | |
| 275 # in comparision with common implementations | |
| 276 # pi[i] = NORMAL_PI[i + 1] | |
| 277 if len(f) == 0: | |
| 278 return [] | |
| 279 pi = [0] | |
| 280 s = 0 | |
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281 for i in range(1, len(f)): |
| 818 | 282 while s > 0 and not nodes_equal(f[s], f[i]): |
| 283 s = pi[s-1] | |
| 284 if nodes_equal(f[s], f[i]): | |
| 285 s += 1 | |
| 286 pi.append(s) | |
| 287 return pi | |
| 288 | |
| 289 for axis in path: | |
| 290 if axis[0] is SELF: | |
| 291 if len(fragment) != 0: | |
| 292 # if element is not first in fragment it has to be | |
| 293 # the same as previous one | |
| 294 # for example child::a/self::b is always wrong | |
| 295 if axis[1] != fragment[-1][1]: | |
| 296 self.fragments = None | |
| 297 return | |
| 298 else: | |
| 299 self_beginning = True | |
| 300 fragment.append(axis[1]) | |
| 301 elif axis[0] is CHILD: | |
| 302 fragment.append(axis[1]) | |
| 303 elif axis[0] is ATTRIBUTE: | |
| 304 pi = calculate_pi(fragment) | |
| 305 self.fragments.append((fragment, pi, axis[1], self_beginning)) | |
| 306 # attribute has always to be at the end, so we can jump out | |
| 307 return | |
| 308 else: | |
| 309 pi = calculate_pi(fragment) | |
| 310 self.fragments.append((fragment, pi, None, self_beginning)) | |
| 311 fragment = [axis[1]] | |
| 312 if axis[0] is DESCENDANT: | |
| 313 self_beginning = False | |
| 314 else: # DESCENDANT_OR_SELF | |
| 315 self_beginning = True | |
| 316 pi = calculate_pi(fragment) | |
| 317 self.fragments.append((fragment, pi, None, self_beginning)) | |
| 318 | |
| 319 def test(self, ignore_context): | |
| 320 # stack of triples (fid, p, ic) | |
| 321 # fid is index of current fragment | |
| 322 # p is position in this fragment | |
| 323 # ic is if we ignore context in this fragment | |
| 324 stack = [] | |
| 325 stack_push = stack.append | |
| 326 stack_pop = stack.pop | |
| 327 frags = self.fragments | |
| 328 frags_len = len(frags) | |
| 329 | |
| 330 def _test(event, namespaces, variables, updateonly=False): | |
| 331 # expression found impossible during init | |
| 332 if frags is None: | |
| 333 return None | |
| 334 | |
| 335 kind, data, pos = event[:3] | |
| 336 | |
| 337 # skip events we don't care about | |
| 338 if kind is END: | |
| 339 if stack: | |
| 340 stack_pop() | |
| 341 return None | |
| 342 if kind is START_NS or kind is END_NS \ | |
| 343 or kind is START_CDATA or kind is END_CDATA: | |
| 344 return None | |
| 345 | |
| 346 if not stack: | |
| 347 # root node, nothing on stack, special case | |
| 348 fid = 0 | |
| 349 # skip empty fragments (there can be actually only one) | |
| 350 while not frags[fid][0]: | |
| 351 fid += 1 | |
| 352 p = 0 | |
| 353 # empty fragment means descendant node at beginning | |
| 354 ic = ignore_context or (fid > 0) | |
| 355 | |
| 356 # expression can match first node, if first axis is self::, | |
| 357 # descendant-or-self:: or if ignore_context is True and | |
| 358 # axis is not descendant:: | |
| 359 if not frags[fid][3] and (not ignore_context or fid > 0): | |
| 360 # axis is not self-beggining, we have to skip this node | |
| 361 stack_push((fid, p, ic)) | |
| 362 return None | |
| 363 else: | |
| 364 # take position of parent | |
| 365 fid, p, ic = stack[-1] | |
| 366 | |
| 367 if fid is not None and not ic: | |
| 368 # fragment not ignoring context - we can't jump back | |
| 369 frag, pi, attrib, _ = frags[fid] | |
| 370 frag_len = len(frag) | |
| 371 | |
| 372 if p == frag_len: | |
| 373 # that probably means empty first fragment | |
| 374 pass | |
| 375 elif frag[p](kind, data, pos, namespaces, variables): | |
| 376 # match, so we can go further | |
| 377 p += 1 | |
| 378 else: | |
| 379 # not matched, so there will be no match in subtree | |
| 380 fid, p = None, None | |
| 381 | |
| 382 if p == frag_len and fid + 1 != frags_len: | |
| 383 # we made it to end of fragment, we can go to following | |
| 384 fid += 1 | |
| 385 p = 0 | |
| 386 ic = True | |
| 387 | |
| 388 if fid is None: | |
| 389 # there was no match in fragment not ignoring context | |
| 390 if kind is START: | |
| 391 stack_push((fid, p, ic)) | |
| 392 return None | |
| 393 | |
| 394 if ic: | |
| 395 # we are in fragment ignoring context | |
| 396 while True: | |
| 397 frag, pi, attrib, _ = frags[fid] | |
| 398 frag_len = len(frag) | |
| 399 | |
| 400 # KMP new "character" | |
| 401 while p > 0 and (p >= frag_len or not \ | |
| 402 frag[p](kind, data, pos, namespaces, variables)): | |
| 403 p = pi[p-1] | |
| 404 if frag[p](kind, data, pos, namespaces, variables): | |
| 405 p += 1 | |
| 406 | |
| 407 if p == frag_len: | |
| 408 # end of fragment reached | |
| 409 if fid + 1 == frags_len: | |
| 410 # that was last fragment | |
| 411 break | |
| 412 else: | |
| 413 fid += 1 | |
| 414 p = 0 | |
| 415 ic = True | |
| 416 if not frags[fid][3]: | |
| 417 # next fragment not self-beginning | |
| 418 break | |
| 419 else: | |
| 420 break | |
| 421 | |
| 422 if kind is START: | |
| 423 # we have to put new position on stack, for children | |
| 424 | |
| 425 if not ic and fid + 1 == frags_len and p == frag_len: | |
| 426 # it is end of the only, not context ignoring fragment | |
| 427 # so there will be no matches in subtree | |
| 428 stack_push((None, None, ic)) | |
| 429 else: | |
| 430 stack_push((fid, p, ic)) | |
| 431 | |
| 432 # have we reached the end of the last fragment? | |
| 433 if fid + 1 == frags_len and p == frag_len: | |
| 434 if attrib: # attribute ended path, return value | |
| 435 return attrib(kind, data, pos, namespaces, variables) | |
| 436 return True | |
| 437 | |
| 438 return None | |
| 439 | |
| 440 return _test | |
| 441 | |
| 442 | |
| 443 class SingleStepStrategy(object): | |
| 444 | |
| 445 @classmethod | |
| 446 def supports(cls, path): | |
| 447 return len(path) == 1 | |
| 448 | |
| 449 def __init__(self, path): | |
| 450 self.path = path | |
| 451 | |
| 452 def test(self, ignore_context): | |
| 453 steps = self.path | |
| 454 if steps[0][0] is ATTRIBUTE: | |
| 455 steps = [_DOTSLASH] + steps | |
| 456 select_attr = steps[-1][0] is ATTRIBUTE and steps[-1][1] or None | |
| 457 | |
| 458 # for every position in expression stores counters' list | |
| 459 # it is used for position based predicates | |
| 460 counters = [] | |
| 461 depth = [0] | |
| 462 | |
| 463 def _test(event, namespaces, variables, updateonly=False): | |
| 464 kind, data, pos = event[:3] | |
| 465 | |
| 466 # Manage the stack that tells us "where we are" in the stream | |
| 467 if kind is END: | |
| 468 if not ignore_context: | |
| 469 depth[0] -= 1 | |
| 470 return None | |
| 471 elif kind is START_NS or kind is END_NS \ | |
| 472 or kind is START_CDATA or kind is END_CDATA: | |
| 473 # should we make namespaces work? | |
| 474 return None | |
| 475 | |
| 476 if not ignore_context: | |
| 477 outside = (steps[0][0] is SELF and depth[0] != 0) \ | |
| 478 or (steps[0][0] is CHILD and depth[0] != 1) \ | |
| 479 or (steps[0][0] is DESCENDANT and depth[0] < 1) | |
| 480 if kind is START: | |
| 481 depth[0] += 1 | |
| 482 if outside: | |
| 483 return None | |
| 484 | |
| 485 axis, nodetest, predicates = steps[0] | |
| 486 if not nodetest(kind, data, pos, namespaces, variables): | |
| 487 return None | |
| 488 | |
| 489 if predicates: | |
| 490 cnum = 0 | |
| 491 for predicate in predicates: | |
| 492 pretval = predicate(kind, data, pos, namespaces, variables) | |
| 493 if type(pretval) is float: # FIXME <- need to check this | |
| 494 # for other types that can be | |
| 495 # coerced to float | |
| 496 if len(counters) < cnum + 1: | |
| 497 counters.append(0) | |
| 498 counters[cnum] += 1 | |
| 499 if counters[cnum] != int(pretval): | |
| 500 pretval = False | |
| 501 cnum += 1 | |
| 502 if not pretval: | |
| 503 return None | |
| 504 | |
| 505 if select_attr: | |
| 506 return select_attr(kind, data, pos, namespaces, variables) | |
| 507 | |
| 508 return True | |
| 509 | |
| 510 return _test | |
| 511 | |
| 512 | |
| 1 | 513 class Path(object): |
|
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514 """Implements basic XPath support on streams. |
| 1 | 515 |
| 818 | 516 Instances of this class represent a "compiled" XPath expression, and |
| 517 provide methods for testing the path against a stream, as well as | |
| 518 extracting a substream matching that path. | |
| 1 | 519 """ |
| 520 | |
| 818 | 521 STRATEGIES = (SingleStepStrategy, SimplePathStrategy, GenericStrategy) |
| 522 | |
|
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523 def __init__(self, text, filename=None, lineno=-1): |
|
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524 """Create the path object from a string. |
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525 |
|
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526 :param text: the path expression |
| 498 | 527 :param filename: the name of the file in which the path expression was |
| 528 found (used in error messages) | |
| 529 :param lineno: the line on which the expression was found | |
|
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530 """ |
| 1 | 531 self.source = text |
|
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532 self.paths = PathParser(text, filename, lineno).parse() |
| 818 | 533 self.strategies = [] |
| 534 for path in self.paths: | |
| 535 for strategy_class in self.STRATEGIES: | |
| 536 if strategy_class.supports(path): | |
| 537 self.strategies.append(strategy_class(path)) | |
| 538 break | |
| 539 else: | |
|
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540 raise NotImplemented('No strategy found for path') |
| 1 | 541 |
| 542 def __repr__(self): | |
| 137 | 543 paths = [] |
| 544 for path in self.paths: | |
| 545 steps = [] | |
| 546 for axis, nodetest, predicates in path: | |
| 547 steps.append('%s::%s' % (axis, nodetest)) | |
| 548 for predicate in predicates: | |
|
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549 steps[-1] += '[%s]' % predicate |
| 137 | 550 paths.append('/'.join(steps)) |
|
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551 return '<%s "%s">' % (type(self).__name__, '|'.join(paths)) |
| 1 | 552 |
|
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553 def select(self, stream, namespaces=None, variables=None): |
|
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554 """Returns a substream of the given stream that matches the path. |
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555 |
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556 If there are no matches, this method returns an empty stream. |
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557 |
| 230 | 558 >>> from genshi.input import XML |
| 33 | 559 >>> xml = XML('<root><elem><child>Text</child></elem></root>') |
| 61 | 560 |
|
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561 >>> print(Path('.//child').select(xml)) |
| 33 | 562 <child>Text</child> |
| 563 | |
|
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564 >>> print(Path('.//child/text()').select(xml)) |
| 33 | 565 Text |
| 566 | |
|
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567 :param stream: the stream to select from |
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568 :param namespaces: (optional) a mapping of namespace prefixes to URIs |
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569 :param variables: (optional) a mapping of variable names to values |
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570 :return: the substream matching the path, or an empty stream |
| 498 | 571 :rtype: `Stream` |
|
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572 """ |
|
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573 if namespaces is None: |
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574 namespaces = {} |
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575 if variables is None: |
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576 variables = {} |
| 1 | 577 stream = iter(stream) |
| 818 | 578 def _generate(stream=stream, ns=namespaces, vs=variables): |
| 579 next = stream.next | |
| 1 | 580 test = self.test() |
| 305 | 581 for event in stream: |
| 818 | 582 result = test(event, ns, vs) |
| 1 | 583 if result is True: |
| 305 | 584 yield event |
|
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585 if event[0] is START: |
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586 depth = 1 |
|
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587 while depth > 0: |
| 818 | 588 subevent = next() |
|
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589 if subevent[0] is START: |
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590 depth += 1 |
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591 elif subevent[0] is END: |
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592 depth -= 1 |
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593 yield subevent |
| 818 | 594 test(subevent, ns, vs, updateonly=True) |
| 1 | 595 elif result: |
| 596 yield result | |
|
605
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597 return Stream(_generate(), |
|
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598 serializer=getattr(stream, 'serializer', None)) |
| 1 | 599 |
|
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Fix for #2 (incorrect context node in path expressions). Still some paths that produce incorrect results, but the common case seems to work now.
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600 def test(self, ignore_context=False): |
|
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601 """Returns a function that can be used to track whether the path matches |
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602 a specific stream event. |
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603 |
|
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604 The function returned expects the positional arguments ``event``, |
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605 ``namespaces`` and ``variables``. The first is a stream event, while the |
| 305 | 606 latter two are a mapping of namespace prefixes to URIs, and a mapping |
| 306 | 607 of variable names to values, respectively. In addition, the function |
|
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608 accepts an ``updateonly`` keyword argument that default to ``False``. If |
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609 it is set to ``True``, the function only updates its internal state, |
| 306 | 610 but does not perform any tests or return a result. |
|
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611 |
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612 If the path matches the event, the function returns the match (for |
|
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613 example, a `START` or `TEXT` event.) Otherwise, it returns ``None``. |
| 33 | 614 |
| 230 | 615 >>> from genshi.input import XML |
| 33 | 616 >>> xml = XML('<root><elem><child id="1"/></elem><child id="2"/></root>') |
| 617 >>> test = Path('child').test() | |
| 818 | 618 >>> namespaces, variables = {}, {} |
| 305 | 619 >>> for event in xml: |
| 818 | 620 ... if test(event, namespaces, variables): |
|
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621 ... print('%s %r' % (event[0], event[1])) |
|
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|
622 START (QName('child'), Attrs([(QName('id'), u'2')])) |
| 498 | 623 |
| 624 :param ignore_context: if `True`, the path is interpreted like a pattern | |
| 625 in XSLT, meaning for example that it will match | |
| 626 at any depth | |
| 627 :return: a function that can be used to test individual events in a | |
| 628 stream against the path | |
| 629 :rtype: ``function`` | |
|
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630 """ |
| 818 | 631 tests = [s.test(ignore_context) for s in self.strategies] |
| 632 if len(tests) == 1: | |
| 633 return tests[0] | |
|
216
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634 |
| 818 | 635 def _multi(event, namespaces, variables, updateonly=False): |
| 636 retval = None | |
| 637 for test in tests: | |
| 638 val = test(event, namespaces, variables, updateonly=updateonly) | |
| 639 if retval is None: | |
| 640 retval = val | |
|
259
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641 return retval |
| 818 | 642 return _multi |
| 1 | 643 |
| 644 | |
|
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645 class PathSyntaxError(Exception): |
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646 """Exception raised when an XPath expression is syntactically incorrect.""" |
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647 |
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648 def __init__(self, message, filename=None, lineno=-1, offset=-1): |
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649 if filename: |
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650 message = '%s (%s, line %d)' % (message, filename, lineno) |
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651 Exception.__init__(self, message) |
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652 self.filename = filename |
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653 self.lineno = lineno |
|
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|
654 self.offset = offset |
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|
655 |
|
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|
656 |
| 137 | 657 class PathParser(object): |
|
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|
658 """Tokenizes and parses an XPath expression.""" |
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|
659 |
|
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660 _QUOTES = (("'", "'"), ('"', '"')) |
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661 _TOKENS = ('::', ':', '..', '.', '//', '/', '[', ']', '()', '(', ')', '@', |
|
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|
662 '=', '!=', '!', '|', ',', '>=', '>', '<=', '<', '$') |
|
163
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663 _tokenize = re.compile('("[^"]*")|(\'[^\']*\')|((?:\d+)?\.\d+)|(%s)|([^%s\s]+)|\s+' % ( |
|
106
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664 '|'.join([re.escape(t) for t in _TOKENS]), |
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665 ''.join([re.escape(t[0]) for t in _TOKENS]))).findall |
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666 |
|
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667 def __init__(self, text, filename=None, lineno=-1): |
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668 self.filename = filename |
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669 self.lineno = lineno |
|
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670 self.tokens = [t for t in [dqstr or sqstr or number or token or name |
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671 for dqstr, sqstr, number, token, name in |
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672 self._tokenize(text)] if t] |
|
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673 self.pos = 0 |
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674 |
|
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675 # Tokenizer |
|
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|
676 |
|
822
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|
677 @property |
|
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|
678 def at_end(self): |
|
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679 return self.pos == len(self.tokens) - 1 |
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|
680 |
|
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|
681 @property |
|
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|
682 def cur_token(self): |
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683 return self.tokens[self.pos] |
|
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684 |
|
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685 def next_token(self): |
|
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686 self.pos += 1 |
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687 return self.tokens[self.pos] |
|
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688 |
|
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689 def peek_token(self): |
|
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690 if not self.at_end: |
|
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691 return self.tokens[self.pos + 1] |
|
f9473bdc93b2
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diff
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|
692 return None |
|
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cmlenz
parents:
77
diff
changeset
|
693 |
|
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Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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parents:
77
diff
changeset
|
694 # Recursive descent parser |
|
f9473bdc93b2
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77
diff
changeset
|
695 |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
696 def parse(self): |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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77
diff
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|
697 """Parses the XPath expression and returns a list of location path |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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77
diff
changeset
|
698 tests. |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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parents:
77
diff
changeset
|
699 |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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parents:
77
diff
changeset
|
700 For union expressions (such as `*|text()`), this function returns one |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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77
diff
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|
701 test for each operand in the union. For patch expressions that don't |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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77
diff
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|
702 use the union operator, the function always returns a list of size 1. |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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parents:
77
diff
changeset
|
703 |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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parents:
77
diff
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|
704 Each path test in turn is a sequence of tests that correspond to the |
|
111
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diff
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|
705 location steps, each tuples of the form `(axis, testfunc, predicates)` |
|
106
f9473bdc93b2
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diff
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|
706 """ |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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77
diff
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|
707 paths = [self._location_path()] |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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77
diff
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|
708 while self.cur_token == '|': |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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diff
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|
709 self.next_token() |
|
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diff
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|
710 paths.append(self._location_path()) |
|
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Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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diff
changeset
|
711 if not self.at_end: |
|
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Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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parents:
77
diff
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|
712 raise PathSyntaxError('Unexpected token %r after end of expression' |
|
139
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diff
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|
713 % self.cur_token, self.filename, self.lineno) |
|
106
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diff
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|
714 return paths |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
715 |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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77
diff
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|
716 def _location_path(self): |
|
f9473bdc93b2
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diff
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|
717 steps = [] |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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diff
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|
718 while True: |
| 215 | 719 if self.cur_token.startswith('/'): |
| 818 | 720 if not steps: |
| 721 if self.cur_token == '//': | |
| 722 # hack to make //* match every node - also root | |
| 723 self.next_token() | |
| 724 axis, nodetest, predicates = self._location_step() | |
| 725 steps.append((DESCENDANT_OR_SELF, nodetest, | |
| 726 predicates)) | |
| 727 if self.at_end or not self.cur_token.startswith('/'): | |
| 728 break | |
| 729 continue | |
| 730 else: | |
| 731 raise PathSyntaxError('Absolute location paths not ' | |
| 732 'supported', self.filename, | |
| 733 self.lineno) | |
| 734 elif self.cur_token == '//': | |
| 215 | 735 steps.append((DESCENDANT_OR_SELF, NodeTest(), [])) |
|
111
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|
736 self.next_token() |
|
2368c3becc52
Some fixes and more unit tests for the XPath engine.
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diff
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|
737 |
| 137 | 738 axis, nodetest, predicates = self._location_step() |
| 739 if not axis: | |
|
145
47bbd9d2a5af
* Fix error in expression evaluation when the expression evaluates to an iterable that does not produce event tuples.
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diff
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|
740 axis = CHILD |
| 137 | 741 steps.append((axis, nodetest, predicates)) |
|
111
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Some fixes and more unit tests for the XPath engine.
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|
742 if self.at_end or not self.cur_token.startswith('/'): |
|
106
f9473bdc93b2
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diff
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|
743 break |
|
111
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Some fixes and more unit tests for the XPath engine.
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106
diff
changeset
|
744 |
|
106
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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77
diff
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|
745 return steps |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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parents:
77
diff
changeset
|
746 |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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parents:
77
diff
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|
747 def _location_step(self): |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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diff
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|
748 if self.cur_token == '@': |
| 114 | 749 axis = ATTRIBUTE |
|
106
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Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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diff
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|
750 self.next_token() |
|
111
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Some fixes and more unit tests for the XPath engine.
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diff
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|
751 elif self.cur_token == '.': |
| 114 | 752 axis = SELF |
| 137 | 753 elif self.cur_token == '..': |
|
139
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diff
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|
754 raise PathSyntaxError('Unsupported axis "parent"', self.filename, |
|
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diff
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|
755 self.lineno) |
|
111
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diff
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|
756 elif self.peek_token() == '::': |
| 114 | 757 axis = Axis.forname(self.cur_token) |
| 758 if axis is None: | |
|
139
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|
759 raise PathSyntaxError('Unsupport axis "%s"' % axis, |
|
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137
diff
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|
760 self.filename, self.lineno) |
|
111
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Some fixes and more unit tests for the XPath engine.
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diff
changeset
|
761 self.next_token() |
|
2368c3becc52
Some fixes and more unit tests for the XPath engine.
cmlenz
parents:
106
diff
changeset
|
762 self.next_token() |
|
106
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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diff
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|
763 else: |
| 137 | 764 axis = None |
| 765 nodetest = self._node_test(axis or CHILD) | |
|
111
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diff
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|
766 predicates = [] |
|
106
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diff
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|
767 while self.cur_token == '[': |
|
111
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diff
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|
768 predicates.append(self._predicate()) |
| 137 | 769 return axis, nodetest, predicates |
|
106
f9473bdc93b2
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cmlenz
parents:
77
diff
changeset
|
770 |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
771 def _node_test(self, axis=None): |
|
224
90d62225f411
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223
diff
changeset
|
772 test = prefix = None |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
773 next_token = self.peek_token() |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
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parents:
223
diff
changeset
|
774 if next_token in ('(', '()'): # Node type test |
|
106
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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diff
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|
775 test = self._node_type() |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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parents:
77
diff
changeset
|
776 |
|
224
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
777 elif next_token == ':': # Namespace prefix |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
778 prefix = self.cur_token |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
779 self.next_token() |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
780 localname = self.next_token() |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
781 if localname == '*': |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
782 test = QualifiedPrincipalTypeTest(axis, prefix) |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
783 else: |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
784 test = QualifiedNameTest(axis, prefix, localname) |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
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223
diff
changeset
|
785 |
|
106
f9473bdc93b2
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cmlenz
parents:
77
diff
changeset
|
786 else: # Name test |
| 137 | 787 if self.cur_token == '*': |
| 788 test = PrincipalTypeTest(axis) | |
| 789 elif self.cur_token == '.': | |
| 790 test = NodeTest() | |
|
106
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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parents:
77
diff
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|
791 else: |
| 137 | 792 test = LocalNameTest(axis, self.cur_token) |
|
106
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
793 |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
794 if not self.at_end: |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
795 self.next_token() |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
796 return test |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
797 |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
798 def _node_type(self): |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
799 name = self.cur_token |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
800 self.next_token() |
| 137 | 801 |
| 802 args = [] | |
| 803 if self.cur_token != '()': | |
| 804 # The processing-instruction() function optionally accepts the | |
| 805 # name of the PI as argument, which must be a literal string | |
| 806 self.next_token() # ( | |
| 807 if self.cur_token != ')': | |
| 808 string = self.cur_token | |
| 809 if (string[0], string[-1]) in self._QUOTES: | |
| 810 string = string[1:-1] | |
| 811 args.append(string) | |
| 812 | |
| 813 cls = _nodetest_map.get(name) | |
| 814 if not cls: | |
|
139
8332287b5508
Implement position reporting for XPath syntax errors. Closes #20.
cmlenz
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137
diff
changeset
|
815 raise PathSyntaxError('%s() not allowed here' % name, self.filename, |
|
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Implement position reporting for XPath syntax errors. Closes #20.
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137
diff
changeset
|
816 self.lineno) |
| 137 | 817 return cls(*args) |
|
106
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
818 |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
819 def _predicate(self): |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
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77
diff
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|
820 assert self.cur_token == '[' |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
821 self.next_token() |
|
111
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Some fixes and more unit tests for the XPath engine.
cmlenz
parents:
106
diff
changeset
|
822 expr = self._or_expr() |
|
121
062e51ad7b19
Added support for the XPath functions `name()`, `namespace-uri()`, `local-name()`, and `not()`.
cmlenz
parents:
114
diff
changeset
|
823 if self.cur_token != ']': |
|
062e51ad7b19
Added support for the XPath functions `name()`, `namespace-uri()`, `local-name()`, and `not()`.
cmlenz
parents:
114
diff
changeset
|
824 raise PathSyntaxError('Expected "]" to close predicate, ' |
|
139
8332287b5508
Implement position reporting for XPath syntax errors. Closes #20.
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137
diff
changeset
|
825 'but found "%s"' % self.cur_token, |
|
8332287b5508
Implement position reporting for XPath syntax errors. Closes #20.
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137
diff
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|
826 self.filename, self.lineno) |
|
111
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cmlenz
parents:
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diff
changeset
|
827 if not self.at_end: |
|
2368c3becc52
Some fixes and more unit tests for the XPath engine.
cmlenz
parents:
106
diff
changeset
|
828 self.next_token() |
|
2368c3becc52
Some fixes and more unit tests for the XPath engine.
cmlenz
parents:
106
diff
changeset
|
829 return expr |
|
106
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
830 |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
831 def _or_expr(self): |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
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77
diff
changeset
|
832 expr = self._and_expr() |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
833 while self.cur_token == 'or': |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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parents:
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diff
changeset
|
834 self.next_token() |
| 137 | 835 expr = OrOperator(expr, self._and_expr()) |
|
106
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
836 return expr |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
837 |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
838 def _and_expr(self): |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
839 expr = self._equality_expr() |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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parents:
77
diff
changeset
|
840 while self.cur_token == 'and': |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
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parents:
77
diff
changeset
|
841 self.next_token() |
| 137 | 842 expr = AndOperator(expr, self._equality_expr()) |
|
106
f9473bdc93b2
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cmlenz
parents:
77
diff
changeset
|
843 return expr |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
844 |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
845 def _equality_expr(self): |
|
162
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cmlenz
parents:
161
diff
changeset
|
846 expr = self._relational_expr() |
|
456039594db9
Implement the XPath relational operators and the `round()` function.
cmlenz
parents:
161
diff
changeset
|
847 while self.cur_token in ('=', '!='): |
|
456039594db9
Implement the XPath relational operators and the `round()` function.
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161
diff
changeset
|
848 op = _operator_map[self.cur_token] |
|
456039594db9
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parents:
161
diff
changeset
|
849 self.next_token() |
|
456039594db9
Implement the XPath relational operators and the `round()` function.
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parents:
161
diff
changeset
|
850 expr = op(expr, self._relational_expr()) |
|
456039594db9
Implement the XPath relational operators and the `round()` function.
cmlenz
parents:
161
diff
changeset
|
851 return expr |
|
456039594db9
Implement the XPath relational operators and the `round()` function.
cmlenz
parents:
161
diff
changeset
|
852 |
|
456039594db9
Implement the XPath relational operators and the `round()` function.
cmlenz
parents:
161
diff
changeset
|
853 def _relational_expr(self): |
| 516 | 854 expr = self._sub_expr() |
|
162
456039594db9
Implement the XPath relational operators and the `round()` function.
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diff
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|
855 while self.cur_token in ('>', '>=', '<', '>='): |
|
456039594db9
Implement the XPath relational operators and the `round()` function.
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|
856 op = _operator_map[self.cur_token] |
|
106
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
857 self.next_token() |
| 516 | 858 expr = op(expr, self._sub_expr()) |
| 859 return expr | |
| 860 | |
| 861 def _sub_expr(self): | |
| 862 token = self.cur_token | |
| 863 if token != '(': | |
| 864 return self._primary_expr() | |
| 865 self.next_token() | |
| 866 expr = self._or_expr() | |
| 867 if self.cur_token != ')': | |
| 868 raise PathSyntaxError('Expected ")" to close sub-expression, ' | |
| 869 'but found "%s"' % self.cur_token, | |
| 870 self.filename, self.lineno) | |
| 871 self.next_token() | |
|
106
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
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|
872 return expr |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
873 |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
874 def _primary_expr(self): |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
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77
diff
changeset
|
875 token = self.cur_token |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
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77
diff
changeset
|
876 if len(token) > 1 and (token[0], token[-1]) in self._QUOTES: |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
877 self.next_token() |
| 137 | 878 return StringLiteral(token[1:-1]) |
|
163
9c023c395e44
Support for XPath number literals including decimal places.
cmlenz
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162
diff
changeset
|
879 elif token[0].isdigit() or token[0] == '.': |
|
106
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
880 self.next_token() |
|
518
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athomas
parents:
516
diff
changeset
|
881 return NumberLiteral(as_float(token)) |
|
179
13909179e5e1
Implemented support for XPath variables in predicates (#31).
cmlenz
parents:
169
diff
changeset
|
882 elif token == '$': |
|
13909179e5e1
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cmlenz
parents:
169
diff
changeset
|
883 token = self.next_token() |
|
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cmlenz
parents:
169
diff
changeset
|
884 self.next_token() |
|
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cmlenz
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169
diff
changeset
|
885 return VariableReference(token) |
|
121
062e51ad7b19
Added support for the XPath functions `name()`, `namespace-uri()`, `local-name()`, and `not()`.
cmlenz
parents:
114
diff
changeset
|
886 elif not self.at_end and self.peek_token().startswith('('): |
|
155
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
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145
diff
changeset
|
887 return self._function_call() |
|
106
f9473bdc93b2
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parents:
77
diff
changeset
|
888 else: |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
889 axis = None |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
890 if token == '@': |
| 114 | 891 axis = ATTRIBUTE |
|
106
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
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|
892 self.next_token() |
|
f9473bdc93b2
Complete rewrite of the XPath parsing, which was a mess before. Closes #19.
cmlenz
parents:
77
diff
changeset
|
893 return self._node_test(axis) |
| 137 | 894 |
|
155
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
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145
diff
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|
895 def _function_call(self): |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
cmlenz
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145
diff
changeset
|
896 name = self.cur_token |
|
9a5aedda1099
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parents:
145
diff
changeset
|
897 if self.next_token() == '()': |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
cmlenz
parents:
145
diff
changeset
|
898 args = [] |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
cmlenz
parents:
145
diff
changeset
|
899 else: |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
cmlenz
parents:
145
diff
changeset
|
900 assert self.cur_token == '(' |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
cmlenz
parents:
145
diff
changeset
|
901 self.next_token() |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
cmlenz
parents:
145
diff
changeset
|
902 args = [self._or_expr()] |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
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parents:
145
diff
changeset
|
903 while self.cur_token == ',': |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
cmlenz
parents:
145
diff
changeset
|
904 self.next_token() |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
cmlenz
parents:
145
diff
changeset
|
905 args.append(self._or_expr()) |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
cmlenz
parents:
145
diff
changeset
|
906 if not self.cur_token == ')': |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
cmlenz
parents:
145
diff
changeset
|
907 raise PathSyntaxError('Expected ")" to close function argument ' |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
cmlenz
parents:
145
diff
changeset
|
908 'list, but found "%s"' % self.cur_token, |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
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parents:
145
diff
changeset
|
909 self.filename, self.lineno) |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
cmlenz
parents:
145
diff
changeset
|
910 self.next_token() |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
cmlenz
parents:
145
diff
changeset
|
911 cls = _function_map.get(name) |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
cmlenz
parents:
145
diff
changeset
|
912 if not cls: |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
cmlenz
parents:
145
diff
changeset
|
913 raise PathSyntaxError('Unsupported function "%s"' % name, |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
cmlenz
parents:
145
diff
changeset
|
914 self.filename, self.lineno) |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
cmlenz
parents:
145
diff
changeset
|
915 return cls(*args) |
|
9a5aedda1099
* String literals in XPath expressions that contains spaces are now tokenizes correctly.
cmlenz
parents:
145
diff
changeset
|
916 |
| 137 | 917 |
|
518
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
918 # Type coercion |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
919 |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
920 def as_scalar(value): |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
921 """Convert value to a scalar. If a single element Attrs() object is passed |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
922 the value of the single attribute will be returned.""" |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
923 if isinstance(value, Attrs): |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
924 assert len(value) == 1 |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
925 return value[0][1] |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
926 else: |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
927 return value |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
928 |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
929 def as_float(value): |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
930 # FIXME - if value is a bool it will be coerced to 0.0 and consequently |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
931 # compared as a float. This is probably not ideal. |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
932 return float(as_scalar(value)) |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
933 |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
934 def as_long(value): |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
935 return long(as_scalar(value)) |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
936 |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
937 def as_string(value): |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
938 value = as_scalar(value) |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
939 if value is False: |
|
852
07f4339fecb0
Remove usage of unicode literals in a couple of places where they were not strictly necessary.
cmlenz
parents:
822
diff
changeset
|
940 return '' |
|
518
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
941 return unicode(value) |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
942 |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
943 def as_bool(value): |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
944 return bool(as_scalar(value)) |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
945 |
|
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
946 |
| 137 | 947 # Node tests |
| 948 | |
| 949 class PrincipalTypeTest(object): | |
|
161
7b1f07496bf7
Various docstring additions and other cosmetic changes.
cmlenz
parents:
156
diff
changeset
|
950 """Node test that matches any event with the given principal type.""" |
| 137 | 951 __slots__ = ['principal_type'] |
| 952 def __init__(self, principal_type): | |
| 953 self.principal_type = principal_type | |
|
224
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
954 def __call__(self, kind, data, pos, namespaces, variables): |
| 137 | 955 if kind is START: |
| 956 if self.principal_type is ATTRIBUTE: | |
| 957 return data[1] or None | |
| 958 else: | |
| 959 return True | |
| 960 def __repr__(self): | |
| 961 return '*' | |
| 962 | |
|
224
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
963 class QualifiedPrincipalTypeTest(object): |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
964 """Node test that matches any event with the given principal type in a |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
965 specific namespace.""" |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
966 __slots__ = ['principal_type', 'prefix'] |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
967 def __init__(self, principal_type, prefix): |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
968 self.principal_type = principal_type |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
969 self.prefix = prefix |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
970 def __call__(self, kind, data, pos, namespaces, variables): |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
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parents:
223
diff
changeset
|
971 namespace = Namespace(namespaces.get(self.prefix)) |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
972 if kind is START: |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
973 if self.principal_type is ATTRIBUTE and data[1]: |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
974 return Attrs([(name, value) for name, value in data[1] |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
975 if name in namespace]) or None |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
976 else: |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
977 return data[0] in namespace |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
978 def __repr__(self): |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
979 return '%s:*' % self.prefix |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
980 |
| 137 | 981 class LocalNameTest(object): |
|
364
7dabedbb53fb
Fix for #77: match templates were matching their own output.
cmlenz
parents:
363
diff
changeset
|
982 """Node test that matches any event with the given principal type and |
|
161
7b1f07496bf7
Various docstring additions and other cosmetic changes.
cmlenz
parents:
156
diff
changeset
|
983 local name. |
|
7b1f07496bf7
Various docstring additions and other cosmetic changes.
cmlenz
parents:
156
diff
changeset
|
984 """ |
| 137 | 985 __slots__ = ['principal_type', 'name'] |
| 986 def __init__(self, principal_type, name): | |
| 987 self.principal_type = principal_type | |
| 988 self.name = name | |
|
224
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
989 def __call__(self, kind, data, pos, namespaces, variables): |
| 137 | 990 if kind is START: |
| 991 if self.principal_type is ATTRIBUTE and self.name in data[1]: | |
|
518
c1f2a859fd75
Attributes selected with an XPath are now returned as an `Attrs()` object in
athomas
parents:
516
diff
changeset
|
992 return Attrs([(self.name, data[1].get(self.name))]) |
| 137 | 993 else: |
| 994 return data[0].localname == self.name | |
| 995 def __repr__(self): | |
| 996 return self.name | |
| 997 | |
|
224
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
998 class QualifiedNameTest(object): |
|
364
7dabedbb53fb
Fix for #77: match templates were matching their own output.
cmlenz
parents:
363
diff
changeset
|
999 """Node test that matches any event with the given principal type and |
|
224
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
1000 qualified name. |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
1001 """ |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
1002 __slots__ = ['principal_type', 'prefix', 'name'] |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
1003 def __init__(self, principal_type, prefix, name): |
|
90d62225f411
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cmlenz
parents:
223
diff
changeset
|
1004 self.principal_type = principal_type |
|
90d62225f411
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cmlenz
parents:
223
diff
changeset
|
1005 self.prefix = prefix |
|
90d62225f411
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cmlenz
parents:
223
diff
changeset
|
1006 self.name = name |
|
90d62225f411
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cmlenz
parents:
223
diff
changeset
|
1007 def __call__(self, kind, data, pos, namespaces, variables): |
|
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cmlenz
parents:
223
diff
changeset
|
1008 qname = QName('%s}%s' % (namespaces.get(self.prefix), self.name)) |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
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|
1009 if kind is START: |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
1010 if self.principal_type is ATTRIBUTE and qname in data[1]: |
|
1043
a21009a2bc3a
Return correct value and properly namespaced attribute name when matching namespaced attributes with XPath expressions (fixes #572; thanks to Olemis Lang <olemis+trac@gmail.com> for bug report and suggestion for fix).
hodgestar
parents:
860
diff
changeset
|
1011 return Attrs([(qname, data[1].get(qname))]) |
|
224
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
1012 else: |
|
90d62225f411
Implement support for namespace prefixes in XPath expressions.
cmlenz
parents:
223
diff
changeset
|
1013 return data[0] == qname |
|
90d62225f411
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cmlenz
parents:
223
diff
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|
1014 def __repr__(self): |
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1015 return '%s:%s' % (self.prefix, self.name) |
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1016 |
| 137 | 1017 class CommentNodeTest(object): |
|
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1018 """Node test that matches any comment events.""" |
| 137 | 1019 __slots__ = [] |
|
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1020 def __call__(self, kind, data, pos, namespaces, variables): |
|
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1021 return kind is COMMENT |
| 137 | 1022 def __repr__(self): |
| 1023 return 'comment()' | |
| 1024 | |
| 1025 class NodeTest(object): | |
|
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1026 """Node test that matches any node.""" |
| 137 | 1027 __slots__ = [] |
|
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1028 def __call__(self, kind, data, pos, namespaces, variables): |
| 137 | 1029 if kind is START: |
| 1030 return True | |
| 1031 return kind, data, pos | |
| 1032 def __repr__(self): | |
| 1033 return 'node()' | |
| 1034 | |
| 1035 class ProcessingInstructionNodeTest(object): | |
|
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1036 """Node test that matches any processing instruction event.""" |
| 137 | 1037 __slots__ = ['target'] |
| 1038 def __init__(self, target=None): | |
| 1039 self.target = target | |
|
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1040 def __call__(self, kind, data, pos, namespaces, variables): |
|
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1041 return kind is PI and (not self.target or data[0] == self.target) |
| 137 | 1042 def __repr__(self): |
| 1043 arg = '' | |
| 1044 if self.target: | |
| 1045 arg = '"' + self.target + '"' | |
| 1046 return 'processing-instruction(%s)' % arg | |
| 1047 | |
| 1048 class TextNodeTest(object): | |
|
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1049 """Node test that matches any text event.""" |
| 137 | 1050 __slots__ = [] |
|
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1051 def __call__(self, kind, data, pos, namespaces, variables): |
|
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1052 return kind is TEXT |
| 137 | 1053 def __repr__(self): |
| 1054 return 'text()' | |
| 1055 | |
| 1056 _nodetest_map = {'comment': CommentNodeTest, 'node': NodeTest, | |
| 1057 'processing-instruction': ProcessingInstructionNodeTest, | |
| 1058 'text': TextNodeTest} | |
| 1059 | |
| 1060 # Functions | |
| 1061 | |
|
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1062 class Function(object): |
|
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1063 """Base class for function nodes in XPath expressions.""" |
|
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1064 |
|
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1065 class BooleanFunction(Function): |
|
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1066 """The `boolean` function, which converts its argument to a boolean |
|
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1067 value. |
|
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1068 """ |
|
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1069 __slots__ = ['expr'] |
| 818 | 1070 _return_type = bool |
|
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1071 def __init__(self, expr): |
|
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1072 self.expr = expr |
|
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1073 def __call__(self, kind, data, pos, namespaces, variables): |
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1074 val = self.expr(kind, data, pos, namespaces, variables) |
|
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1075 return as_bool(val) |
|
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1076 def __repr__(self): |
|
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1077 return 'boolean(%r)' % self.expr |
|
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1078 |
|
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1079 class CeilingFunction(Function): |
|
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1080 """The `ceiling` function, which returns the nearest lower integer number |
|
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1081 for the given number. |
|
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1082 """ |
|
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1083 __slots__ = ['number'] |
|
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1084 def __init__(self, number): |
|
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1085 self.number = number |
|
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1086 def __call__(self, kind, data, pos, namespaces, variables): |
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1087 number = self.number(kind, data, pos, namespaces, variables) |
|
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1088 return ceil(as_float(number)) |
|
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1089 def __repr__(self): |
|
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1090 return 'ceiling(%r)' % self.number |
|
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|
1091 |
|
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|
1092 class ConcatFunction(Function): |
|
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1093 """The `concat` function, which concatenates (joins) the variable number of |
|
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|
1094 strings it gets as arguments. |
|
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|
1095 """ |
|
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|
1096 __slots__ = ['exprs'] |
|
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1097 def __init__(self, *exprs): |
|
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1098 self.exprs = exprs |
|
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1099 def __call__(self, kind, data, pos, namespaces, variables): |
|
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1100 strings = [] |
|
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1101 for item in [expr(kind, data, pos, namespaces, variables) |
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1102 for expr in self.exprs]: |
|
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1103 strings.append(as_string(item)) |
|
852
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|
1104 return ''.join(strings) |
|
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1105 def __repr__(self): |
| 169 | 1106 return 'concat(%s)' % ', '.join([repr(expr) for expr in self.exprs]) |
|
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1107 |
|
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|
1108 class ContainsFunction(Function): |
|
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1109 """The `contains` function, which returns whether a string contains a given |
|
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|
1110 substring. |
|
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|
1111 """ |
|
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1112 __slots__ = ['string1', 'string2'] |
|
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1113 def __init__(self, string1, string2): |
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1114 self.string1 = string1 |
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1115 self.string2 = string2 |
|
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1116 def __call__(self, kind, data, pos, namespaces, variables): |
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1117 string1 = self.string1(kind, data, pos, namespaces, variables) |
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1118 string2 = self.string2(kind, data, pos, namespaces, variables) |
|
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1119 return as_string(string2) in as_string(string1) |
|
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1120 def __repr__(self): |
|
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1121 return 'contains(%r, %r)' % (self.string1, self.string2) |
|
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1122 |
|
534
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|
1123 class MatchesFunction(Function): |
|
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|
1124 """The `matches` function, which returns whether a string matches a regular |
|
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|
1125 expression. |
|
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|
1126 """ |
|
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|
1127 __slots__ = ['string1', 'string2'] |
|
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|
1128 flag_mapping = {'s': re.S, 'm': re.M, 'i': re.I, 'x': re.X} |
|
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|
1129 |
|
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|
1130 def __init__(self, string1, string2, flags=''): |
|
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1131 self.string1 = string1 |
|
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|
1132 self.string2 = string2 |
|
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|
1133 self.flags = self._map_flags(flags) |
|
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1134 def __call__(self, kind, data, pos, namespaces, variables): |
|
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1135 string1 = as_string(self.string1(kind, data, pos, namespaces, variables)) |
|
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1136 string2 = as_string(self.string2(kind, data, pos, namespaces, variables)) |
|
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1137 return re.search(string2, string1, self.flags) |
|
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1138 def _map_flags(self, flags): |
| 593 | 1139 return reduce(operator.or_, |
|
534
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1140 [self.flag_map[flag] for flag in flags], re.U) |
|
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1141 def __repr__(self): |
|
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|
1142 return 'contains(%r, %r)' % (self.string1, self.string2) |
|
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1143 |
|
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1144 class FalseFunction(Function): |
|
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1145 """The `false` function, which always returns the boolean `false` value.""" |
|
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1146 __slots__ = [] |
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1147 def __call__(self, kind, data, pos, namespaces, variables): |
|
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1148 return False |
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1149 def __repr__(self): |
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1150 return 'false()' |
|
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1151 |
|
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1152 class FloorFunction(Function): |
|
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1153 """The `ceiling` function, which returns the nearest higher integer number |
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1154 for the given number. |
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1155 """ |
|
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1156 __slots__ = ['number'] |
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1157 def __init__(self, number): |
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1158 self.number = number |
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1159 def __call__(self, kind, data, pos, namespaces, variables): |
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1160 number = self.number(kind, data, pos, namespaces, variables) |
|
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1161 return floor(as_float(number)) |
|
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1162 def __repr__(self): |
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1163 return 'floor(%r)' % self.number |
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1164 |
|
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1165 class LocalNameFunction(Function): |
|
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1166 """The `local-name` function, which returns the local name of the current |
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1167 element. |
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1168 """ |
| 137 | 1169 __slots__ = [] |
|
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1170 def __call__(self, kind, data, pos, namespaces, variables): |
| 137 | 1171 if kind is START: |
| 234 | 1172 return data[0].localname |
| 137 | 1173 def __repr__(self): |
| 1174 return 'local-name()' | |
| 1175 | |
|
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1176 class NameFunction(Function): |
|
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1177 """The `name` function, which returns the qualified name of the current |
|
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1178 element. |
|
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1179 """ |
| 137 | 1180 __slots__ = [] |
|
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1181 def __call__(self, kind, data, pos, namespaces, variables): |
| 137 | 1182 if kind is START: |
| 234 | 1183 return data[0] |
| 137 | 1184 def __repr__(self): |
| 1185 return 'name()' | |
| 1186 | |
|
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1187 class NamespaceUriFunction(Function): |
|
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1188 """The `namespace-uri` function, which returns the namespace URI of the |
|
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1189 current element. |
|
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1190 """ |
| 137 | 1191 __slots__ = [] |
|
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1192 def __call__(self, kind, data, pos, namespaces, variables): |
| 137 | 1193 if kind is START: |
| 234 | 1194 return data[0].namespace |
| 137 | 1195 def __repr__(self): |
| 1196 return 'namespace-uri()' | |
| 1197 | |
|
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1198 class NotFunction(Function): |
|
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1199 """The `not` function, which returns the negated boolean value of its |
|
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|
1200 argument. |
|
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1201 """ |
| 137 | 1202 __slots__ = ['expr'] |
| 1203 def __init__(self, expr): | |
| 1204 self.expr = expr | |
|
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1205 def __call__(self, kind, data, pos, namespaces, variables): |
|
518
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1206 return not as_bool(self.expr(kind, data, pos, namespaces, variables)) |
| 137 | 1207 def __repr__(self): |
| 1208 return 'not(%s)' % self.expr | |
| 1209 | |
|
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1210 class NormalizeSpaceFunction(Function): |
|
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1211 """The `normalize-space` function, which removes leading and trailing |
|
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1212 whitespace in the given string, and replaces multiple adjacent whitespace |
|
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|
1213 characters inside the string with a single space. |
|
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|
1214 """ |
|
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1215 __slots__ = ['expr'] |
|
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1216 _normalize = re.compile(r'\s{2,}').sub |
|
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1217 def __init__(self, expr): |
|
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1218 self.expr = expr |
|
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1219 def __call__(self, kind, data, pos, namespaces, variables): |
|
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1220 string = self.expr(kind, data, pos, namespaces, variables) |
|
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1221 return self._normalize(' ', as_string(string).strip()) |
|
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1222 def __repr__(self): |
|
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1223 return 'normalize-space(%s)' % repr(self.expr) |
|
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1224 |
|
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|
1225 class NumberFunction(Function): |
|
161
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|
1226 """The `number` function that converts its argument to a number.""" |
|
155
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1227 __slots__ = ['expr'] |
|
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1228 def __init__(self, expr): |
|
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1229 self.expr = expr |
|
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1230 def __call__(self, kind, data, pos, namespaces, variables): |
|
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1231 val = self.expr(kind, data, pos, namespaces, variables) |
|
518
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1232 return as_float(val) |
|
155
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1233 def __repr__(self): |
|
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|
1234 return 'number(%r)' % self.expr |
|
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|
1235 |
|
162
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1236 class RoundFunction(Function): |
|
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|
1237 """The `round` function, which returns the nearest integer number for the |
|
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|
1238 given number. |
|
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Implement the XPath relational operators and the `round()` function.
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|
1239 """ |
|
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|
1240 __slots__ = ['number'] |
|
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|
1241 def __init__(self, number): |
|
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|
1242 self.number = number |
|
224
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1243 def __call__(self, kind, data, pos, namespaces, variables): |
|
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1244 number = self.number(kind, data, pos, namespaces, variables) |
|
518
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|
1245 return round(as_float(number)) |
|
162
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|
1246 def __repr__(self): |
|
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Implement the XPath relational operators and the `round()` function.
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|
1247 return 'round(%r)' % self.number |
|
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Implement the XPath relational operators and the `round()` function.
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|
1248 |
|
155
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|
1249 class StartsWithFunction(Function): |
|
161
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|
1250 """The `starts-with` function that returns whether one string starts with |
|
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|
1251 a given substring. |
|
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|
1252 """ |
|
155
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|
1253 __slots__ = ['string1', 'string2'] |
|
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|
1254 def __init__(self, string1, string2): |
|
282
24b3cbbc1b1b
Fix `starts-with()` XPath function so that it actually compares the two strings. Closes #61.
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|
1255 self.string1 = string1 |
|
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|
1256 self.string2 = string2 |
|
224
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1257 def __call__(self, kind, data, pos, namespaces, variables): |
|
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|
1258 string1 = self.string1(kind, data, pos, namespaces, variables) |
|
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|
1259 string2 = self.string2(kind, data, pos, namespaces, variables) |
|
518
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|
1260 return as_string(string1).startswith(as_string(string2)) |
|
155
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|
1261 def __repr__(self): |
|
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|
1262 return 'starts-with(%r, %r)' % (self.string1, self.string2) |
|
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|
1263 |
|
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|
1264 class StringLengthFunction(Function): |
|
161
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|
1265 """The `string-length` function that returns the length of the given |
|
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|
1266 string. |
|
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|
1267 """ |
|
155
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|
1268 __slots__ = ['expr'] |
|
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|
1269 def __init__(self, expr): |
|
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|
1270 self.expr = expr |
|
224
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|
1271 def __call__(self, kind, data, pos, namespaces, variables): |
|
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|
1272 string = self.expr(kind, data, pos, namespaces, variables) |
|
518
c1f2a859fd75
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|
1273 return len(as_string(string)) |
|
155
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|
1274 def __repr__(self): |
|
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|
1275 return 'string-length(%r)' % self.expr |
|
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|
1276 |
|
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|
1277 class SubstringFunction(Function): |
|
161
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|
1278 """The `substring` function that returns the part of a string that starts |
|
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|
1279 at the given offset, and optionally limited to the given length. |
|
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|
1280 """ |
|
155
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|
1281 __slots__ = ['string', 'start', 'length'] |
|
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|
1282 def __init__(self, string, start, length=None): |
|
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|
1283 self.string = string |
|
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|
1284 self.start = start |
|
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|
1285 self.length = length |
|
224
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1286 def __call__(self, kind, data, pos, namespaces, variables): |
|
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|
1287 string = self.string(kind, data, pos, namespaces, variables) |
|
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|
1288 start = self.start(kind, data, pos, namespaces, variables) |
|
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|
1289 length = 0 |
|
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|
1290 if self.length is not None: |
|
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|
1291 length = self.length(kind, data, pos, namespaces, variables) |
|
518
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|
1292 return string[as_long(start):len(as_string(string)) - as_long(length)] |
|
155
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|
1293 def __repr__(self): |
|
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|
1294 if self.length is not None: |
|
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|
1295 return 'substring(%r, %r, %r)' % (self.string, self.start, |
|
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|
1296 self.length) |
|
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|
1297 else: |
|
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|
1298 return 'substring(%r, %r)' % (self.string, self.start) |
|
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|
1299 |
|
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|
1300 class SubstringAfterFunction(Function): |
|
161
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|
1301 """The `substring-after` function that returns the part of a string that |
|
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|
1302 is found after the given substring. |
|
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|
1303 """ |
|
155
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|
1304 __slots__ = ['string1', 'string2'] |
|
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|
1305 def __init__(self, string1, string2): |
|
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|
1306 self.string1 = string1 |
|
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|
1307 self.string2 = string2 |
|
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1308 def __call__(self, kind, data, pos, namespaces, variables): |
|
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1309 string1 = as_string(self.string1(kind, data, pos, namespaces, variables)) |
|
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1310 string2 = as_string(self.string2(kind, data, pos, namespaces, variables)) |
|
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1311 index = string1.find(string2) |
|
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1312 if index >= 0: |
|
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|
1313 return string1[index + len(string2):] |
|
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|
1314 return '' |
|
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1315 def __repr__(self): |
|
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1316 return 'substring-after(%r, %r)' % (self.string1, self.string2) |
|
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1317 |
|
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|
1318 class SubstringBeforeFunction(Function): |
|
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1319 """The `substring-before` function that returns the part of a string that |
|
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1320 is found before the given substring. |
|
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|
1321 """ |
|
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1322 __slots__ = ['string1', 'string2'] |
|
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1323 def __init__(self, string1, string2): |
|
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1324 self.string1 = string1 |
|
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1325 self.string2 = string2 |
|
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1326 def __call__(self, kind, data, pos, namespaces, variables): |
|
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|
1327 string1 = as_string(self.string1(kind, data, pos, namespaces, variables)) |
|
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|
1328 string2 = as_string(self.string2(kind, data, pos, namespaces, variables)) |
|
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|
1329 index = string1.find(string2) |
|
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|
1330 if index >= 0: |
|
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|
1331 return string1[:index] |
|
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|
1332 return '' |
|
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|
1333 def __repr__(self): |
|
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|
1334 return 'substring-after(%r, %r)' % (self.string1, self.string2) |
|
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|
1335 |
|
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|
1336 class TranslateFunction(Function): |
|
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|
1337 """The `translate` function that translates a set of characters in a |
|
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|
1338 string to target set of characters. |
|
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|
1339 """ |
|
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|
1340 __slots__ = ['string', 'fromchars', 'tochars'] |
|
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|
1341 def __init__(self, string, fromchars, tochars): |
|
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|
1342 self.string = string |
|
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|
1343 self.fromchars = fromchars |
|
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|
1344 self.tochars = tochars |
|
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|
1345 def __call__(self, kind, data, pos, namespaces, variables): |
|
518
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|
1346 string = as_string(self.string(kind, data, pos, namespaces, variables)) |
|
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|
1347 fromchars = as_string(self.fromchars(kind, data, pos, namespaces, variables)) |
|
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|
1348 tochars = as_string(self.tochars(kind, data, pos, namespaces, variables)) |
|
155
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|
1349 table = dict(zip([ord(c) for c in fromchars], |
|
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|
1350 [ord(c) for c in tochars])) |
|
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|
1351 return string.translate(table) |
|
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|
1352 def __repr__(self): |
|
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|
1353 return 'translate(%r, %r, %r)' % (self.string, self.fromchars, |
|
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|
1354 self.tochars) |
|
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diff
changeset
|
1355 |
|
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diff
changeset
|
1356 class TrueFunction(Function): |
|
161
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|
1357 """The `true` function, which always returns the boolean `true` value.""" |
|
155
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|
1358 __slots__ = [] |
|
224
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|
1359 def __call__(self, kind, data, pos, namespaces, variables): |
|
155
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|
1360 return True |
|
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diff
changeset
|
1361 def __repr__(self): |
|
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145
diff
changeset
|
1362 return 'true()' |
|
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145
diff
changeset
|
1363 |
|
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diff
changeset
|
1364 _function_map = {'boolean': BooleanFunction, 'ceiling': CeilingFunction, |
|
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|
1365 'concat': ConcatFunction, 'contains': ContainsFunction, |
|
534
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Add XPath `matches()` function which, of course, supports the Python regular
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diff
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|
1366 'matches': MatchesFunction, 'false': FalseFunction, 'floor': |
|
57b5d5138f1a
Add XPath `matches()` function which, of course, supports the Python regular
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518
diff
changeset
|
1367 FloorFunction, 'local-name': LocalNameFunction, 'name': |
|
57b5d5138f1a
Add XPath `matches()` function which, of course, supports the Python regular
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|
1368 NameFunction, 'namespace-uri': NamespaceUriFunction, |
|
155
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|
1369 'normalize-space': NormalizeSpaceFunction, 'not': NotFunction, |
|
162
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Implement the XPath relational operators and the `round()` function.
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diff
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|
1370 'number': NumberFunction, 'round': RoundFunction, |
|
534
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diff
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|
1371 'starts-with': StartsWithFunction, 'string-length': |
|
57b5d5138f1a
Add XPath `matches()` function which, of course, supports the Python regular
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diff
changeset
|
1372 StringLengthFunction, 'substring': SubstringFunction, |
|
57b5d5138f1a
Add XPath `matches()` function which, of course, supports the Python regular
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diff
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|
1373 'substring-after': SubstringAfterFunction, 'substring-before': |
|
57b5d5138f1a
Add XPath `matches()` function which, of course, supports the Python regular
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diff
changeset
|
1374 SubstringBeforeFunction, 'translate': TranslateFunction, |
|
57b5d5138f1a
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diff
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|
1375 'true': TrueFunction} |
| 137 | 1376 |
|
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|
1377 # Literals & Variables |
| 137 | 1378 |
|
155
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|
1379 class Literal(object): |
|
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|
1380 """Abstract base class for literal nodes.""" |
|
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diff
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|
1381 |
|
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diff
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|
1382 class StringLiteral(Literal): |
|
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|
1383 """A string literal node.""" |
| 137 | 1384 __slots__ = ['text'] |
| 1385 def __init__(self, text): | |
| 1386 self.text = text | |
|
224
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|
1387 def __call__(self, kind, data, pos, namespaces, variables): |
|
228
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|
1388 return self.text |
| 137 | 1389 def __repr__(self): |
| 1390 return '"%s"' % self.text | |
| 1391 | |
|
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|
1392 class NumberLiteral(Literal): |
|
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|
1393 """A number literal node.""" |
| 137 | 1394 __slots__ = ['number'] |
| 1395 def __init__(self, number): | |
| 1396 self.number = number | |
|
224
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|
1397 def __call__(self, kind, data, pos, namespaces, variables): |
|
228
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|
1398 return self.number |
| 137 | 1399 def __repr__(self): |
| 1400 return str(self.number) | |
| 1401 | |
|
179
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|
1402 class VariableReference(Literal): |
|
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|
1403 """A variable reference node.""" |
|
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|
1404 __slots__ = ['name'] |
|
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|
1405 def __init__(self, name): |
|
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|
1406 self.name = name |
|
224
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|
1407 def __call__(self, kind, data, pos, namespaces, variables): |
|
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|
1408 return variables.get(self.name) |
|
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|
1409 def __repr__(self): |
| 215 | 1410 return str(self.name) |
|
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|
1411 |
| 137 | 1412 # Operators |
| 1413 | |
| 1414 class AndOperator(object): | |
|
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|
1415 """The boolean operator `and`.""" |
| 137 | 1416 __slots__ = ['lval', 'rval'] |
| 1417 def __init__(self, lval, rval): | |
| 1418 self.lval = lval | |
| 1419 self.rval = rval | |
|
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|
1420 def __call__(self, kind, data, pos, namespaces, variables): |
|
518
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|
1421 lval = as_bool(self.lval(kind, data, pos, namespaces, variables)) |
|
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|
1422 if not lval: |
|
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|
1423 return False |
|
224
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|
1424 rval = self.rval(kind, data, pos, namespaces, variables) |
|
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|
1425 return as_bool(rval) |
| 137 | 1426 def __repr__(self): |
|
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|
1427 return '%s and %s' % (self.lval, self.rval) |
| 137 | 1428 |
|
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|
1429 class EqualsOperator(object): |
|
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|
1430 """The equality operator `=`.""" |
| 137 | 1431 __slots__ = ['lval', 'rval'] |
| 1432 def __init__(self, lval, rval): | |
| 1433 self.lval = lval | |
| 1434 self.rval = rval | |
|
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|
1435 def __call__(self, kind, data, pos, namespaces, variables): |
|
518
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|
1436 lval = as_scalar(self.lval(kind, data, pos, namespaces, variables)) |
|
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|
1437 rval = as_scalar(self.rval(kind, data, pos, namespaces, variables)) |
|
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|
1438 return lval == rval |
| 137 | 1439 def __repr__(self): |
|
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|
1440 return '%s=%s' % (self.lval, self.rval) |
| 137 | 1441 |
|
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|
1442 class NotEqualsOperator(object): |
|
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|
1443 """The equality operator `!=`.""" |
| 137 | 1444 __slots__ = ['lval', 'rval'] |
| 1445 def __init__(self, lval, rval): | |
| 1446 self.lval = lval | |
| 1447 self.rval = rval | |
|
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|
1448 def __call__(self, kind, data, pos, namespaces, variables): |
|
518
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|
1449 lval = as_scalar(self.lval(kind, data, pos, namespaces, variables)) |
|
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|
1450 rval = as_scalar(self.rval(kind, data, pos, namespaces, variables)) |
|
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|
1451 return lval != rval |
|
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|
1452 def __repr__(self): |
|
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diff
changeset
|
1453 return '%s!=%s' % (self.lval, self.rval) |
|
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|
1454 |
|
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1455 class OrOperator(object): |
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1456 """The boolean operator `or`.""" |
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1457 __slots__ = ['lval', 'rval'] |
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1458 def __init__(self, lval, rval): |
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1459 self.lval = lval |
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1460 self.rval = rval |
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1461 def __call__(self, kind, data, pos, namespaces, variables): |
|
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1462 lval = as_bool(self.lval(kind, data, pos, namespaces, variables)) |
|
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1463 if lval: |
| 137 | 1464 return True |
|
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1465 rval = self.rval(kind, data, pos, namespaces, variables) |
|
518
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1466 return as_bool(rval) |
| 137 | 1467 def __repr__(self): |
| 1468 return '%s or %s' % (self.lval, self.rval) | |
| 1469 | |
|
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1470 class GreaterThanOperator(object): |
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1471 """The relational operator `>` (greater than).""" |
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1472 __slots__ = ['lval', 'rval'] |
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1473 def __init__(self, lval, rval): |
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1474 self.lval = lval |
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1475 self.rval = rval |
|
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1476 def __call__(self, kind, data, pos, namespaces, variables): |
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1477 lval = self.lval(kind, data, pos, namespaces, variables) |
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1478 rval = self.rval(kind, data, pos, namespaces, variables) |
|
518
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1479 return as_float(lval) > as_float(rval) |
|
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1480 def __repr__(self): |
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1481 return '%s>%s' % (self.lval, self.rval) |
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1482 |
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1483 class GreaterThanOrEqualOperator(object): |
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1484 """The relational operator `>=` (greater than or equal).""" |
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1485 __slots__ = ['lval', 'rval'] |
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1486 def __init__(self, lval, rval): |
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1487 self.lval = lval |
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1488 self.rval = rval |
|
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1489 def __call__(self, kind, data, pos, namespaces, variables): |
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1490 lval = self.lval(kind, data, pos, namespaces, variables) |
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1491 rval = self.rval(kind, data, pos, namespaces, variables) |
|
518
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1492 return as_float(lval) >= as_float(rval) |
|
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1493 def __repr__(self): |
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1494 return '%s>=%s' % (self.lval, self.rval) |
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1495 |
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1496 class LessThanOperator(object): |
|
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1497 """The relational operator `<` (less than).""" |
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1498 __slots__ = ['lval', 'rval'] |
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1499 def __init__(self, lval, rval): |
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1500 self.lval = lval |
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1501 self.rval = rval |
|
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1502 def __call__(self, kind, data, pos, namespaces, variables): |
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1503 lval = self.lval(kind, data, pos, namespaces, variables) |
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1504 rval = self.rval(kind, data, pos, namespaces, variables) |
|
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1505 return as_float(lval) < as_float(rval) |
|
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1506 def __repr__(self): |
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1507 return '%s<%s' % (self.lval, self.rval) |
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1508 |
|
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1509 class LessThanOrEqualOperator(object): |
|
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1510 """The relational operator `<=` (less than or equal).""" |
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1511 __slots__ = ['lval', 'rval'] |
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1512 def __init__(self, lval, rval): |
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1513 self.lval = lval |
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1514 self.rval = rval |
|
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1515 def __call__(self, kind, data, pos, namespaces, variables): |
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1516 lval = self.lval(kind, data, pos, namespaces, variables) |
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1517 rval = self.rval(kind, data, pos, namespaces, variables) |
|
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|
1518 return as_float(lval) <= as_float(rval) |
|
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1519 def __repr__(self): |
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1520 return '%s<=%s' % (self.lval, self.rval) |
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1521 |
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1522 _operator_map = {'=': EqualsOperator, '!=': NotEqualsOperator, |
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1523 '>': GreaterThanOperator, '>=': GreaterThanOrEqualOperator, |
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1524 '<': LessThanOperator, '>=': LessThanOrEqualOperator} |
|
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|
1525 |
|
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|
1526 |
|
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|
1527 _DOTSLASHSLASH = (DESCENDANT_OR_SELF, PrincipalTypeTest(None), ()) |
| 818 | 1528 _DOTSLASH = (SELF, PrincipalTypeTest(None), ()) |