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| 1 # Copyright 2012 Benjamin Kalman | |
| 2 # | |
| 3 # Licensed under the Apache License, Version 2.0 (the "License"); | |
| 4 # you may not use this file except in compliance with the License. | |
| 5 # You may obtain a copy of the License at | |
| 6 # | |
| 7 # http://www.apache.org/licenses/LICENSE-2.0 | |
| 8 # | |
| 9 # Unless required by applicable law or agreed to in writing, software | |
| 10 # distributed under the License is distributed on an "AS IS" BASIS, | |
| 11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 12 # See the License for the specific language governing permissions and | |
| 13 # limitations under the License. | |
| 14 | |
| 15 # TODO: New name, not "handlebar". | |
| 16 # TODO: Escaping control characters somehow. e.g. \{{, \{{-. | |
| 17 | |
| 18 import json | |
| 19 import re | |
| 20 | |
| 21 '''Handlebar templates are data binding templates more-than-loosely inspired by | |
| 22 ctemplate. Use like: | |
| 23 | |
| 24 from handlebar import Handlebar | |
| 25 | |
| 26 template = Handlebar('hello {{#foo bar/}} world') | |
| 27 input = { | |
| 28 'foo': [ | |
| 29 { 'bar': 1 }, | |
| 30 { 'bar': 2 }, | |
| 31 { 'bar': 3 } | |
| 32 ] | |
| 33 } | |
| 34 print(template.render(input).text) | |
| 35 | |
| 36 Handlebar will use get() on contexts to return values, so to create custom | |
| 37 getters (for example, something that populates values lazily from keys), just | |
| 38 provide an object with a get() method. | |
| 39 | |
| 40 class CustomContext(object): | |
| 41 def get(self, key): | |
| 42 return 10 | |
| 43 print(Handlebar('hello {{world}}').render(CustomContext()).text) | |
| 44 | |
| 45 will print 'hello 10'. | |
| 46 ''' | |
| 47 | |
| 48 class ParseException(Exception): | |
| 49 '''The exception thrown while parsing a template. | |
| 50 ''' | |
| 51 def __init__(self, error): | |
| 52 Exception.__init__(self, error) | |
| 53 | |
| 54 class RenderResult(object): | |
| 55 '''The result of a render operation. | |
| 56 ''' | |
| 57 def __init__(self, text, errors): | |
| 58 self.text = text; | |
| 59 self.errors = errors | |
| 60 | |
| 61 def __repr__(self): | |
| 62 return '%s(text=%s, errors=%s)' % (type(self).__name__, | |
| 63 self.text, | |
| 64 self.errors) | |
| 65 | |
| 66 def __str__(self): | |
| 67 return repr(self) | |
| 68 | |
| 69 class _StringBuilder(object): | |
| 70 '''Efficiently builds strings. | |
| 71 ''' | |
| 72 def __init__(self): | |
| 73 self._buf = [] | |
| 74 | |
| 75 def __len__(self): | |
| 76 self._Collapse() | |
| 77 return len(self._buf[0]) | |
| 78 | |
| 79 def Append(self, string): | |
| 80 if not isinstance(string, basestring): | |
| 81 string = str(string) | |
| 82 self._buf.append(string) | |
| 83 | |
| 84 def ToString(self): | |
| 85 self._Collapse() | |
| 86 return self._buf[0] | |
| 87 | |
| 88 def _Collapse(self): | |
| 89 self._buf = [u''.join(self._buf)] | |
| 90 | |
| 91 def __repr__(self): | |
| 92 return self.ToString() | |
| 93 | |
| 94 def __str__(self): | |
| 95 return repr(self) | |
| 96 | |
| 97 class _Contexts(object): | |
| 98 '''Tracks a stack of context objects, providing efficient key/value retrieval. | |
| 99 ''' | |
| 100 class _Node(object): | |
| 101 '''A node within the stack. Wraps a real context and maintains the key/value | |
| 102 pairs seen so far. | |
| 103 ''' | |
| 104 def __init__(self, value): | |
| 105 self._value = value | |
| 106 self._value_has_get = hasattr(value, 'get') | |
| 107 self._found = {} | |
| 108 | |
| 109 def GetKeys(self): | |
| 110 '''Returns the list of keys that |_value| contains. | |
| 111 ''' | |
| 112 return self._found.keys() | |
| 113 | |
| 114 def Get(self, key): | |
| 115 '''Returns the value for |key|, or None if not found (including if | |
| 116 |_value| doesn't support key retrieval). | |
| 117 ''' | |
| 118 if not self._value_has_get: | |
| 119 return None | |
| 120 value = self._found.get(key) | |
| 121 if value is not None: | |
| 122 return value | |
| 123 value = self._value.get(key) | |
| 124 if value is not None: | |
| 125 self._found[key] = value | |
| 126 return value | |
| 127 | |
| 128 def __repr__(self): | |
| 129 return 'Node(value=%s, found=%s)' % (self._value, self._found) | |
| 130 | |
| 131 def __str__(self): | |
| 132 return repr(self) | |
| 133 | |
| 134 def __init__(self, globals_): | |
| 135 '''Initializes with the initial global contexts, listed in order from most | |
| 136 to least important. | |
| 137 ''' | |
| 138 self._nodes = map(_Contexts._Node, globals_) | |
| 139 self._first_local = len(self._nodes) | |
| 140 self._value_info = {} | |
| 141 | |
| 142 def CreateFromGlobals(self): | |
| 143 new = _Contexts([]) | |
| 144 new._nodes = self._nodes[:self._first_local] | |
| 145 new._first_local = self._first_local | |
| 146 return new | |
| 147 | |
| 148 def Push(self, context): | |
| 149 self._nodes.append(_Contexts._Node(context)) | |
| 150 | |
| 151 def Pop(self): | |
| 152 node = self._nodes.pop() | |
| 153 assert len(self._nodes) >= self._first_local | |
| 154 for found_key in node.GetKeys(): | |
| 155 # [0] is the stack of nodes that |found_key| has been found in. | |
| 156 self._value_info[found_key][0].pop() | |
| 157 | |
| 158 def FirstLocal(self): | |
| 159 if len(self._nodes) == self._first_local: | |
| 160 return None | |
| 161 return self._nodes[-1]._value | |
| 162 | |
| 163 def Resolve(self, path): | |
| 164 # This method is only efficient at finding |key|; if |tail| has a value (and | |
| 165 # |key| evaluates to an indexable value) we'll need to descend into that. | |
| 166 key, tail = path.split('.', 1) if '.' in path else (path, None) | |
| 167 found = self._FindNodeValue(key) | |
| 168 if tail is None: | |
| 169 return found | |
| 170 for part in tail.split('.'): | |
| 171 if not hasattr(found, 'get'): | |
| 172 return None | |
| 173 found = found.get(part) | |
| 174 return found | |
| 175 | |
| 176 def Scope(self, context, fn, *args): | |
| 177 self.Push(context) | |
| 178 try: | |
| 179 return fn(*args) | |
| 180 finally: | |
| 181 self.Pop() | |
| 182 | |
| 183 def _FindNodeValue(self, key): | |
| 184 # |found_node_list| will be all the nodes that |key| has been found in. | |
| 185 # |checked_node_set| are those that have been checked. | |
| 186 info = self._value_info.get(key) | |
| 187 if info is None: | |
| 188 info = ([], set()) | |
| 189 self._value_info[key] = info | |
| 190 found_node_list, checked_node_set = info | |
| 191 | |
| 192 # Check all the nodes not yet checked for |key|. | |
| 193 newly_found = [] | |
| 194 for node in reversed(self._nodes): | |
| 195 if node in checked_node_set: | |
| 196 break | |
| 197 value = node.Get(key) | |
| 198 if value is not None: | |
| 199 newly_found.append(node) | |
| 200 checked_node_set.add(node) | |
| 201 | |
| 202 # The nodes will have been found in reverse stack order. After extending | |
| 203 # the found nodes, the freshest value will be at the tip of the stack. | |
| 204 found_node_list.extend(reversed(newly_found)) | |
| 205 if not found_node_list: | |
| 206 return None | |
| 207 | |
| 208 return found_node_list[-1]._value.get(key) | |
| 209 | |
| 210 class _Stack(object): | |
| 211 class Entry(object): | |
| 212 def __init__(self, name, id_): | |
| 213 self.name = name | |
| 214 self.id_ = id_ | |
| 215 | |
| 216 def __init__(self, entries=[]): | |
| 217 self.entries = entries | |
| 218 | |
| 219 def Descend(self, name, id_): | |
| 220 descended = list(self.entries) | |
| 221 descended.append(_Stack.Entry(name, id_)) | |
| 222 return _Stack(entries=descended) | |
| 223 | |
| 224 class _InternalContext(object): | |
| 225 def __init__(self): | |
| 226 self._render_state = None | |
| 227 | |
| 228 def SetRenderState(self, render_state): | |
| 229 self._render_state = render_state | |
| 230 | |
| 231 def get(self, key): | |
| 232 if key == 'errors': | |
| 233 errors = self._render_state._errors | |
| 234 return '\n'.join(errors) if errors else None | |
| 235 return None | |
| 236 | |
| 237 class _RenderState(object): | |
| 238 '''The state of a render call. | |
| 239 ''' | |
| 240 def __init__(self, name, contexts, _stack=_Stack()): | |
| 241 self.text = _StringBuilder() | |
| 242 self.contexts = contexts | |
| 243 self._name = name | |
| 244 self._errors = [] | |
| 245 self._stack = _stack | |
| 246 | |
| 247 def AddResolutionError(self, id_, description=None): | |
| 248 message = id_.CreateResolutionErrorMessage(self._name, stack=self._stack) | |
| 249 if description is not None: | |
| 250 message = '%s (%s)' % (message, description) | |
| 251 self._errors.append(message) | |
| 252 | |
| 253 def Copy(self): | |
| 254 return _RenderState( | |
| 255 self._name, self.contexts, _stack=self._stack) | |
| 256 | |
| 257 def ForkPartial(self, custom_name, id_): | |
| 258 name = custom_name or id_.name | |
| 259 return _RenderState(name, | |
| 260 self.contexts.CreateFromGlobals(), | |
| 261 _stack=self._stack.Descend(name, id_)) | |
| 262 | |
| 263 def Merge(self, render_state, text_transform=None): | |
| 264 self._errors.extend(render_state._errors) | |
| 265 text = render_state.text.ToString() | |
| 266 if text_transform is not None: | |
| 267 text = text_transform(text) | |
| 268 self.text.Append(text) | |
| 269 | |
| 270 def GetResult(self): | |
| 271 return RenderResult(self.text.ToString(), self._errors); | |
| 272 | |
| 273 class _Identifier(object): | |
| 274 '''An identifier of the form 'foo', 'foo.bar.baz', 'foo-bar.baz', etc. | |
| 275 ''' | |
| 276 _VALID_ID_MATCHER = re.compile(r'^[a-zA-Z0-9@_/-]+$') | |
| 277 | |
| 278 def __init__(self, name, line, column): | |
| 279 self.name = name | |
| 280 self.line = line | |
| 281 self.column = column | |
| 282 if name == '': | |
| 283 raise ParseException('Empty identifier %s' % self.GetDescription()) | |
| 284 for part in name.split('.'): | |
| 285 if not _Identifier._VALID_ID_MATCHER.match(part): | |
| 286 raise ParseException('Invalid identifier %s' % self.GetDescription()) | |
| 287 | |
| 288 def GetDescription(self): | |
| 289 return '\'%s\' at line %s column %s' % (self.name, self.line, self.column) | |
| 290 | |
| 291 def CreateResolutionErrorMessage(self, name, stack=None): | |
| 292 message = _StringBuilder() | |
| 293 message.Append('Failed to resolve %s in %s\n' % (self.GetDescription(), | |
| 294 name)) | |
| 295 if stack is not None: | |
| 296 for entry in reversed(stack.entries): | |
| 297 message.Append(' included as %s in %s\n' % (entry.id_.GetDescription(), | |
| 298 entry.name)) | |
| 299 return message.ToString().strip() | |
| 300 | |
| 301 def __repr__(self): | |
| 302 return self.name | |
| 303 | |
| 304 def __str__(self): | |
| 305 return repr(self) | |
| 306 | |
| 307 class _Node(object): pass | |
| 308 | |
| 309 class _LeafNode(_Node): | |
| 310 def __init__(self, start_line, end_line): | |
| 311 self._start_line = start_line | |
| 312 self._end_line = end_line | |
| 313 | |
| 314 def StartsWithNewLine(self): | |
| 315 return False | |
| 316 | |
| 317 def TrimStartingNewLine(self): | |
| 318 pass | |
| 319 | |
| 320 def TrimEndingSpaces(self): | |
| 321 return 0 | |
| 322 | |
| 323 def TrimEndingNewLine(self): | |
| 324 pass | |
| 325 | |
| 326 def EndsWithEmptyLine(self): | |
| 327 return False | |
| 328 | |
| 329 def GetStartLine(self): | |
| 330 return self._start_line | |
| 331 | |
| 332 def GetEndLine(self): | |
| 333 return self._end_line | |
| 334 | |
| 335 def __str__(self): | |
| 336 return repr(self) | |
| 337 | |
| 338 class _DecoratorNode(_Node): | |
| 339 def __init__(self, content): | |
| 340 self._content = content | |
| 341 | |
| 342 def StartsWithNewLine(self): | |
| 343 return self._content.StartsWithNewLine() | |
| 344 | |
| 345 def TrimStartingNewLine(self): | |
| 346 self._content.TrimStartingNewLine() | |
| 347 | |
| 348 def TrimEndingSpaces(self): | |
| 349 return self._content.TrimEndingSpaces() | |
| 350 | |
| 351 def TrimEndingNewLine(self): | |
| 352 self._content.TrimEndingNewLine() | |
| 353 | |
| 354 def EndsWithEmptyLine(self): | |
| 355 return self._content.EndsWithEmptyLine() | |
| 356 | |
| 357 def GetStartLine(self): | |
| 358 return self._content.GetStartLine() | |
| 359 | |
| 360 def GetEndLine(self): | |
| 361 return self._content.GetEndLine() | |
| 362 | |
| 363 def __repr__(self): | |
| 364 return str(self._content) | |
| 365 | |
| 366 def __str__(self): | |
| 367 return repr(self) | |
| 368 | |
| 369 class _InlineNode(_DecoratorNode): | |
| 370 def __init__(self, content): | |
| 371 _DecoratorNode.__init__(self, content) | |
| 372 | |
| 373 def Render(self, render_state): | |
| 374 content_render_state = render_state.Copy() | |
| 375 self._content.Render(content_render_state) | |
| 376 render_state.Merge(content_render_state, | |
| 377 text_transform=lambda text: text.replace('\n', '')) | |
| 378 | |
| 379 class _IndentedNode(_DecoratorNode): | |
| 380 def __init__(self, content, indentation): | |
| 381 _DecoratorNode.__init__(self, content) | |
| 382 self._indent_str = ' ' * indentation | |
| 383 | |
| 384 def Render(self, render_state): | |
| 385 if isinstance(self._content, _CommentNode): | |
| 386 return | |
| 387 def inlinify(text): | |
| 388 if len(text) == 0: # avoid rendering a blank line | |
| 389 return '' | |
| 390 buf = _StringBuilder() | |
| 391 buf.Append(self._indent_str) | |
| 392 buf.Append(text.replace('\n', '\n%s' % self._indent_str)) | |
| 393 if not text.endswith('\n'): # partials will often already end in a \n | |
| 394 buf.Append('\n') | |
| 395 return buf.ToString() | |
| 396 content_render_state = render_state.Copy() | |
| 397 self._content.Render(content_render_state) | |
| 398 render_state.Merge(content_render_state, text_transform=inlinify) | |
| 399 | |
| 400 class _BlockNode(_DecoratorNode): | |
| 401 def __init__(self, content): | |
| 402 _DecoratorNode.__init__(self, content) | |
| 403 content.TrimStartingNewLine() | |
| 404 content.TrimEndingSpaces() | |
| 405 | |
| 406 def Render(self, render_state): | |
| 407 self._content.Render(render_state) | |
| 408 | |
| 409 class _NodeCollection(_Node): | |
| 410 def __init__(self, nodes): | |
| 411 assert nodes | |
| 412 self._nodes = nodes | |
| 413 | |
| 414 def Render(self, render_state): | |
| 415 for node in self._nodes: | |
| 416 node.Render(render_state) | |
| 417 | |
| 418 def StartsWithNewLine(self): | |
| 419 return self._nodes[0].StartsWithNewLine() | |
| 420 | |
| 421 def TrimStartingNewLine(self): | |
| 422 self._nodes[0].TrimStartingNewLine() | |
| 423 | |
| 424 def TrimEndingSpaces(self): | |
| 425 return self._nodes[-1].TrimEndingSpaces() | |
| 426 | |
| 427 def TrimEndingNewLine(self): | |
| 428 self._nodes[-1].TrimEndingNewLine() | |
| 429 | |
| 430 def EndsWithEmptyLine(self): | |
| 431 return self._nodes[-1].EndsWithEmptyLine() | |
| 432 | |
| 433 def GetStartLine(self): | |
| 434 return self._nodes[0].GetStartLine() | |
| 435 | |
| 436 def GetEndLine(self): | |
| 437 return self._nodes[-1].GetEndLine() | |
| 438 | |
| 439 def __repr__(self): | |
| 440 return ''.join(str(node) for node in self._nodes) | |
| 441 | |
| 442 class _StringNode(_Node): | |
| 443 '''Just a string. | |
| 444 ''' | |
| 445 def __init__(self, string, start_line, end_line): | |
| 446 self._string = string | |
| 447 self._start_line = start_line | |
| 448 self._end_line = end_line | |
| 449 | |
| 450 def Render(self, render_state): | |
| 451 render_state.text.Append(self._string) | |
| 452 | |
| 453 def StartsWithNewLine(self): | |
| 454 return self._string.startswith('\n') | |
| 455 | |
| 456 def TrimStartingNewLine(self): | |
| 457 if self.StartsWithNewLine(): | |
| 458 self._string = self._string[1:] | |
| 459 | |
| 460 def TrimEndingSpaces(self): | |
| 461 original_length = len(self._string) | |
| 462 self._string = self._string[:self._LastIndexOfSpaces()] | |
| 463 return original_length - len(self._string) | |
| 464 | |
| 465 def TrimEndingNewLine(self): | |
| 466 if self._string.endswith('\n'): | |
| 467 self._string = self._string[:len(self._string) - 1] | |
| 468 | |
| 469 def EndsWithEmptyLine(self): | |
| 470 index = self._LastIndexOfSpaces() | |
| 471 return index == 0 or self._string[index - 1] == '\n' | |
| 472 | |
| 473 def _LastIndexOfSpaces(self): | |
| 474 index = len(self._string) | |
| 475 while index > 0 and self._string[index - 1] == ' ': | |
| 476 index -= 1 | |
| 477 return index | |
| 478 | |
| 479 def GetStartLine(self): | |
| 480 return self._start_line | |
| 481 | |
| 482 def GetEndLine(self): | |
| 483 return self._end_line | |
| 484 | |
| 485 def __repr__(self): | |
| 486 return self._string | |
| 487 | |
| 488 class _EscapedVariableNode(_LeafNode): | |
| 489 '''{{foo}} | |
| 490 ''' | |
| 491 def __init__(self, id_): | |
| 492 _LeafNode.__init__(self, id_.line, id_.line) | |
| 493 self._id = id_ | |
| 494 | |
| 495 def Render(self, render_state): | |
| 496 value = render_state.contexts.Resolve(self._id.name) | |
| 497 if value is None: | |
| 498 render_state.AddResolutionError(self._id) | |
| 499 return | |
| 500 string = value if isinstance(value, basestring) else str(value) | |
| 501 render_state.text.Append(string.replace('&', '&') | |
| 502 .replace('<', '<') | |
| 503 .replace('>', '>')) | |
| 504 | |
| 505 def __repr__(self): | |
| 506 return '{{%s}}' % self._id | |
| 507 | |
| 508 class _UnescapedVariableNode(_LeafNode): | |
| 509 '''{{{foo}}} | |
| 510 ''' | |
| 511 def __init__(self, id_): | |
| 512 _LeafNode.__init__(self, id_.line, id_.line) | |
| 513 self._id = id_ | |
| 514 | |
| 515 def Render(self, render_state): | |
| 516 value = render_state.contexts.Resolve(self._id.name) | |
| 517 if value is None: | |
| 518 render_state.AddResolutionError(self._id) | |
| 519 return | |
| 520 string = value if isinstance(value, basestring) else str(value) | |
| 521 render_state.text.Append(string) | |
| 522 | |
| 523 def __repr__(self): | |
| 524 return '{{{%s}}}' % self._id | |
| 525 | |
| 526 class _CommentNode(_LeafNode): | |
| 527 '''{{- This is a comment -}} | |
| 528 An empty placeholder node for correct indented rendering behaviour. | |
| 529 ''' | |
| 530 def __init__(self, start_line, end_line): | |
| 531 _LeafNode.__init__(self, start_line, end_line) | |
| 532 | |
| 533 def Render(self, render_state): | |
| 534 pass | |
| 535 | |
| 536 def __repr__(self): | |
| 537 return '<comment>' | |
| 538 | |
| 539 class _SectionNode(_DecoratorNode): | |
| 540 '''{{#var:foo}} ... {{/foo}} | |
| 541 ''' | |
| 542 def __init__(self, bind_to, id_, content): | |
| 543 _DecoratorNode.__init__(self, content) | |
| 544 self._bind_to = bind_to | |
| 545 self._id = id_ | |
| 546 | |
| 547 def Render(self, render_state): | |
| 548 value = render_state.contexts.Resolve(self._id.name) | |
| 549 if isinstance(value, list): | |
| 550 for item in value: | |
| 551 if self._bind_to is not None: | |
| 552 render_state.contexts.Scope({self._bind_to.name: item}, | |
| 553 self._content.Render, render_state) | |
| 554 else: | |
| 555 self._content.Render(render_state) | |
| 556 elif hasattr(value, 'get'): | |
| 557 if self._bind_to is not None: | |
| 558 render_state.contexts.Scope({self._bind_to.name: value}, | |
| 559 self._content.Render, render_state) | |
| 560 else: | |
| 561 render_state.contexts.Scope(value, self._content.Render, render_state) | |
| 562 else: | |
| 563 render_state.AddResolutionError(self._id) | |
| 564 | |
| 565 def __repr__(self): | |
| 566 return '{{#%s}}%s{{/%s}}' % ( | |
| 567 self._id, _DecoratorNode.__repr__(self), self._id) | |
| 568 | |
| 569 class _VertedSectionNode(_DecoratorNode): | |
| 570 '''{{?var:foo}} ... {{/foo}} | |
| 571 ''' | |
| 572 def __init__(self, bind_to, id_, content): | |
| 573 _DecoratorNode.__init__(self, content) | |
| 574 self._bind_to = bind_to | |
| 575 self._id = id_ | |
| 576 | |
| 577 def Render(self, render_state): | |
| 578 value = render_state.contexts.Resolve(self._id.name) | |
| 579 if _VertedSectionNode.ShouldRender(value): | |
| 580 if self._bind_to is not None: | |
| 581 render_state.contexts.Scope({self._bind_to.name: value}, | |
| 582 self._content.Render, render_state) | |
| 583 else: | |
| 584 self._content.Render(render_state) | |
| 585 | |
| 586 def __repr__(self): | |
| 587 return '{{?%s}}%s{{/%s}}' % ( | |
| 588 self._id, _DecoratorNode.__repr__(self), self._id) | |
| 589 | |
| 590 @staticmethod | |
| 591 def ShouldRender(value): | |
| 592 if value is None: | |
| 593 return False | |
| 594 if isinstance(value, bool): | |
| 595 return value | |
| 596 if isinstance(value, list): | |
| 597 return len(value) > 0 | |
| 598 return True | |
| 599 | |
| 600 class _InvertedSectionNode(_DecoratorNode): | |
| 601 '''{{^foo}} ... {{/foo}} | |
| 602 ''' | |
| 603 def __init__(self, bind_to, id_, content): | |
| 604 _DecoratorNode.__init__(self, content) | |
| 605 if bind_to is not None: | |
| 606 raise ParseException('{{^%s:%s}} does not support variable binding' | |
| 607 % (bind_to, id_)) | |
| 608 self._id = id_ | |
| 609 | |
| 610 def Render(self, render_state): | |
| 611 value = render_state.contexts.Resolve(self._id.name) | |
| 612 if not _VertedSectionNode.ShouldRender(value): | |
| 613 self._content.Render(render_state) | |
| 614 | |
| 615 def __repr__(self): | |
| 616 return '{{^%s}}%s{{/%s}}' % ( | |
| 617 self._id, _DecoratorNode.__repr__(self), self._id) | |
| 618 | |
| 619 class _AssertionNode(_LeafNode): | |
| 620 '''{{!foo Some comment about foo}} | |
| 621 ''' | |
| 622 def __init__(self, id_, description): | |
| 623 _LeafNode.__init__(self, id_.line, id_.line) | |
| 624 self._id = id_ | |
| 625 self._description = description | |
| 626 | |
| 627 def Render(self, render_state): | |
| 628 if render_state.contexts.Resolve(self._id.name) is None: | |
| 629 render_state.AddResolutionError(self._id, description=self._description) | |
| 630 | |
| 631 def __repr__(self): | |
| 632 return '{{!%s %s}}' % (self._id, self._description) | |
| 633 | |
| 634 class _JsonNode(_LeafNode): | |
| 635 '''{{*foo}} | |
| 636 ''' | |
| 637 def __init__(self, id_): | |
| 638 _LeafNode.__init__(self, id_.line, id_.line) | |
| 639 self._id = id_ | |
| 640 | |
| 641 def Render(self, render_state): | |
| 642 value = render_state.contexts.Resolve(self._id.name) | |
| 643 if value is None: | |
| 644 render_state.AddResolutionError(self._id) | |
| 645 return | |
| 646 render_state.text.Append(json.dumps(value, separators=(',',':'))) | |
| 647 | |
| 648 def __repr__(self): | |
| 649 return '{{*%s}}' % self._id | |
| 650 | |
| 651 # TODO: Better common model of _PartialNodeWithArguments, _PartialNodeInContext, | |
| 652 # and _PartialNode. | |
| 653 class _PartialNodeWithArguments(_DecoratorNode): | |
| 654 def __init__(self, partial, args): | |
| 655 if isinstance(partial, Handlebar): | |
| 656 # Preserve any get() method that the caller has added. | |
| 657 if hasattr(partial, 'get'): | |
| 658 self.get = partial.get | |
| 659 partial = partial._top_node | |
| 660 _DecoratorNode.__init__(self, partial) | |
| 661 self._partial = partial | |
| 662 self._args = args | |
| 663 | |
| 664 def Render(self, render_state): | |
| 665 render_state.contexts.Scope(self._args, self._partial.Render, render_state) | |
| 666 | |
| 667 class _PartialNodeInContext(_DecoratorNode): | |
| 668 def __init__(self, partial, context): | |
| 669 if isinstance(partial, Handlebar): | |
| 670 # Preserve any get() method that the caller has added. | |
| 671 if hasattr(partial, 'get'): | |
| 672 self.get = partial.get | |
| 673 partial = partial._top_node | |
| 674 _DecoratorNode.__init__(self, partial) | |
| 675 self._partial = partial | |
| 676 self._context = context | |
| 677 | |
| 678 def Render(self, render_state): | |
| 679 original_contexts = render_state.contexts | |
| 680 try: | |
| 681 render_state.contexts = self._context | |
| 682 render_state.contexts.Scope( | |
| 683 # The first local context of |original_contexts| will be the | |
| 684 # arguments that were passed to the partial, if any. | |
| 685 original_contexts.FirstLocal() or {}, | |
| 686 self._partial.Render, render_state) | |
| 687 finally: | |
| 688 render_state.contexts = original_contexts | |
| 689 | |
| 690 class _PartialNode(_LeafNode): | |
| 691 '''{{+var:foo}} ... {{/foo}} | |
| 692 ''' | |
| 693 def __init__(self, bind_to, id_, content): | |
| 694 _LeafNode.__init__(self, id_.line, id_.line) | |
| 695 self._bind_to = bind_to | |
| 696 self._id = id_ | |
| 697 self._content = content | |
| 698 self._args = None | |
| 699 self._pass_through_id = None | |
| 700 | |
| 701 @classmethod | |
| 702 def Inline(cls, id_): | |
| 703 return cls(None, id_, None) | |
| 704 | |
| 705 def Render(self, render_state): | |
| 706 value = render_state.contexts.Resolve(self._id.name) | |
| 707 if value is None: | |
| 708 render_state.AddResolutionError(self._id) | |
| 709 return | |
| 710 if not isinstance(value, (Handlebar, _Node)): | |
| 711 render_state.AddResolutionError(self._id, description='not a partial') | |
| 712 return | |
| 713 | |
| 714 if isinstance(value, Handlebar): | |
| 715 node, name = value._top_node, value._name | |
| 716 else: | |
| 717 node, name = value, None | |
| 718 | |
| 719 partial_render_state = render_state.ForkPartial(name, self._id) | |
| 720 | |
| 721 arg_context = {} | |
| 722 if self._pass_through_id is not None: | |
| 723 context = render_state.contexts.Resolve(self._pass_through_id.name) | |
| 724 if context is not None: | |
| 725 arg_context[self._pass_through_id.name] = context | |
| 726 if self._args is not None: | |
| 727 def resolve_args(args): | |
| 728 resolved = {} | |
| 729 for key, value in args.iteritems(): | |
| 730 if isinstance(value, dict): | |
| 731 assert len(value.keys()) == 1 | |
| 732 id_of_partial, partial_args = value.items()[0] | |
| 733 partial = render_state.contexts.Resolve(id_of_partial.name) | |
| 734 if partial is not None: | |
| 735 resolved[key] = _PartialNodeWithArguments( | |
| 736 partial, resolve_args(partial_args)) | |
| 737 else: | |
| 738 context = render_state.contexts.Resolve(value.name) | |
| 739 if context is not None: | |
| 740 resolved[key] = context | |
| 741 return resolved | |
| 742 arg_context.update(resolve_args(self._args)) | |
| 743 if self._bind_to and self._content: | |
| 744 arg_context[self._bind_to.name] = _PartialNodeInContext( | |
| 745 self._content, render_state.contexts) | |
| 746 if arg_context: | |
| 747 partial_render_state.contexts.Push(arg_context) | |
| 748 | |
| 749 node.Render(partial_render_state) | |
| 750 | |
| 751 render_state.Merge( | |
| 752 partial_render_state, | |
| 753 text_transform=lambda text: text[:-1] if text.endswith('\n') else text) | |
| 754 | |
| 755 def SetArguments(self, args): | |
| 756 self._args = args | |
| 757 | |
| 758 def PassThroughArgument(self, id_): | |
| 759 self._pass_through_id = id_ | |
| 760 | |
| 761 def __repr__(self): | |
| 762 return '{{+%s}}' % self._id | |
| 763 | |
| 764 _TOKENS = {} | |
| 765 | |
| 766 class _Token(object): | |
| 767 '''The tokens that can appear in a template. | |
| 768 ''' | |
| 769 class Data(object): | |
| 770 def __init__(self, name, text, clazz): | |
| 771 self.name = name | |
| 772 self.text = text | |
| 773 self.clazz = clazz | |
| 774 _TOKENS[text] = self | |
| 775 | |
| 776 def ElseNodeClass(self): | |
| 777 if self.clazz == _VertedSectionNode: | |
| 778 return _InvertedSectionNode | |
| 779 if self.clazz == _InvertedSectionNode: | |
| 780 return _VertedSectionNode | |
| 781 return None | |
| 782 | |
| 783 def __repr__(self): | |
| 784 return self.name | |
| 785 | |
| 786 def __str__(self): | |
| 787 return repr(self) | |
| 788 | |
| 789 OPEN_START_SECTION = Data( | |
| 790 'OPEN_START_SECTION' , '{{#', _SectionNode) | |
| 791 OPEN_START_VERTED_SECTION = Data( | |
| 792 'OPEN_START_VERTED_SECTION' , '{{?', _VertedSectionNode) | |
| 793 OPEN_START_INVERTED_SECTION = Data( | |
| 794 'OPEN_START_INVERTED_SECTION', '{{^', _InvertedSectionNode) | |
| 795 OPEN_ASSERTION = Data( | |
| 796 'OPEN_ASSERTION' , '{{!', _AssertionNode) | |
| 797 OPEN_JSON = Data( | |
| 798 'OPEN_JSON' , '{{*', _JsonNode) | |
| 799 OPEN_PARTIAL = Data( | |
| 800 'OPEN_PARTIAL' , '{{+', _PartialNode) | |
| 801 OPEN_ELSE = Data( | |
| 802 'OPEN_ELSE' , '{{:', None) | |
| 803 OPEN_END_SECTION = Data( | |
| 804 'OPEN_END_SECTION' , '{{/', None) | |
| 805 INLINE_END_SECTION = Data( | |
| 806 'INLINE_END_SECTION' , '/}}', None) | |
| 807 OPEN_UNESCAPED_VARIABLE = Data( | |
| 808 'OPEN_UNESCAPED_VARIABLE' , '{{{', _UnescapedVariableNode) | |
| 809 CLOSE_MUSTACHE3 = Data( | |
| 810 'CLOSE_MUSTACHE3' , '}}}', None) | |
| 811 OPEN_COMMENT = Data( | |
| 812 'OPEN_COMMENT' , '{{-', _CommentNode) | |
| 813 CLOSE_COMMENT = Data( | |
| 814 'CLOSE_COMMENT' , '-}}', None) | |
| 815 OPEN_VARIABLE = Data( | |
| 816 'OPEN_VARIABLE' , '{{' , _EscapedVariableNode) | |
| 817 CLOSE_MUSTACHE = Data( | |
| 818 'CLOSE_MUSTACHE' , '}}' , None) | |
| 819 CHARACTER = Data( | |
| 820 'CHARACTER' , '.' , None) | |
| 821 | |
| 822 class _TokenStream(object): | |
| 823 '''Tokeniser for template parsing. | |
| 824 ''' | |
| 825 def __init__(self, string): | |
| 826 self.next_token = None | |
| 827 self.next_line = 1 | |
| 828 self.next_column = 0 | |
| 829 self._string = string | |
| 830 self._cursor = 0 | |
| 831 self.Advance() | |
| 832 | |
| 833 def HasNext(self): | |
| 834 return self.next_token is not None | |
| 835 | |
| 836 def NextCharacter(self): | |
| 837 if self.next_token is _Token.CHARACTER: | |
| 838 return self._string[self._cursor - 1] | |
| 839 return None | |
| 840 | |
| 841 def Advance(self): | |
| 842 if self._cursor > 0 and self._string[self._cursor - 1] == '\n': | |
| 843 self.next_line += 1 | |
| 844 self.next_column = 0 | |
| 845 elif self.next_token is not None: | |
| 846 self.next_column += len(self.next_token.text) | |
| 847 | |
| 848 self.next_token = None | |
| 849 | |
| 850 if self._cursor == len(self._string): | |
| 851 return None | |
| 852 assert self._cursor < len(self._string) | |
| 853 | |
| 854 if (self._cursor + 1 < len(self._string) and | |
| 855 self._string[self._cursor + 1] in '{}'): | |
| 856 self.next_token = ( | |
| 857 _TOKENS.get(self._string[self._cursor:self._cursor+3]) or | |
| 858 _TOKENS.get(self._string[self._cursor:self._cursor+2])) | |
| 859 | |
| 860 if self.next_token is None: | |
| 861 self.next_token = _Token.CHARACTER | |
| 862 | |
| 863 self._cursor += len(self.next_token.text) | |
| 864 return self | |
| 865 | |
| 866 def AdvanceOver(self, token, description=None): | |
| 867 parse_error = None | |
| 868 if not self.next_token: | |
| 869 parse_error = 'Reached EOF but expected %s' % token.name | |
| 870 elif self.next_token is not token: | |
| 871 parse_error = 'Expecting token %s but got %s at line %s' % ( | |
| 872 token.name, self.next_token.name, self.next_line) | |
| 873 if parse_error: | |
| 874 parse_error += ' %s' % description or '' | |
| 875 raise ParseException(parse_error) | |
| 876 return self.Advance() | |
| 877 | |
| 878 def AdvanceOverSeparator(self, char, description=None): | |
| 879 self.SkipWhitespace() | |
| 880 next_char = self.NextCharacter() | |
| 881 if next_char != char: | |
| 882 parse_error = 'Expected \'%s\'. got \'%s\'' % (char, next_char) | |
| 883 if description is not None: | |
| 884 parse_error += ' (%s)' % description | |
| 885 raise ParseException(parse_error) | |
| 886 self.AdvanceOver(_Token.CHARACTER) | |
| 887 self.SkipWhitespace() | |
| 888 | |
| 889 def AdvanceOverNextString(self, excluded=''): | |
| 890 start = self._cursor - len(self.next_token.text) | |
| 891 while (self.next_token is _Token.CHARACTER and | |
| 892 # Can use -1 here because token length of CHARACTER is 1. | |
| 893 self._string[self._cursor - 1] not in excluded): | |
| 894 self.Advance() | |
| 895 end = self._cursor - (len(self.next_token.text) if self.next_token else 0) | |
| 896 return self._string[start:end] | |
| 897 | |
| 898 def AdvanceToNextWhitespace(self): | |
| 899 return self.AdvanceOverNextString(excluded=' \n\r\t') | |
| 900 | |
| 901 def SkipWhitespace(self): | |
| 902 while (self.next_token is _Token.CHARACTER and | |
| 903 # Can use -1 here because token length of CHARACTER is 1. | |
| 904 self._string[self._cursor - 1] in ' \n\r\t'): | |
| 905 self.Advance() | |
| 906 | |
| 907 def __repr__(self): | |
| 908 return '%s(next_token=%s, remainder=%s)' % (type(self).__name__, | |
| 909 self.next_token, | |
| 910 self._string[self._cursor:]) | |
| 911 | |
| 912 def __str__(self): | |
| 913 return repr(self) | |
| 914 | |
| 915 class Handlebar(object): | |
| 916 '''A handlebar template. | |
| 917 ''' | |
| 918 def __init__(self, template, name=None): | |
| 919 self.source = template | |
| 920 self._name = name | |
| 921 tokens = _TokenStream(template) | |
| 922 self._top_node = self._ParseSection(tokens) | |
| 923 if not self._top_node: | |
| 924 raise ParseException('Template is empty') | |
| 925 if tokens.HasNext(): | |
| 926 raise ParseException('There are still tokens remaining at %s, ' | |
| 927 'was there an end-section without a start-section?' % | |
| 928 tokens.next_line) | |
| 929 | |
| 930 def _ParseSection(self, tokens): | |
| 931 nodes = [] | |
| 932 while tokens.HasNext(): | |
| 933 if tokens.next_token in (_Token.OPEN_END_SECTION, | |
| 934 _Token.OPEN_ELSE): | |
| 935 # Handled after running parseSection within the SECTION cases, so this | |
| 936 # is a terminating condition. If there *is* an orphaned | |
| 937 # OPEN_END_SECTION, it will be caught by noticing that there are | |
| 938 # leftover tokens after termination. | |
| 939 break | |
| 940 elif tokens.next_token in (_Token.CLOSE_MUSTACHE, | |
| 941 _Token.CLOSE_MUSTACHE3): | |
| 942 raise ParseException('Orphaned %s at line %s' % (tokens.next_token.name, | |
| 943 tokens.next_line)) | |
| 944 nodes += self._ParseNextOpenToken(tokens) | |
| 945 | |
| 946 for i, node in enumerate(nodes): | |
| 947 if isinstance(node, _StringNode): | |
| 948 continue | |
| 949 | |
| 950 previous_node = nodes[i - 1] if i > 0 else None | |
| 951 next_node = nodes[i + 1] if i < len(nodes) - 1 else None | |
| 952 rendered_node = None | |
| 953 | |
| 954 if node.GetStartLine() != node.GetEndLine(): | |
| 955 rendered_node = _BlockNode(node) | |
| 956 if previous_node: | |
| 957 previous_node.TrimEndingSpaces() | |
| 958 if next_node: | |
| 959 next_node.TrimStartingNewLine() | |
| 960 elif ((not previous_node or previous_node.EndsWithEmptyLine()) and | |
| 961 (not next_node or next_node.StartsWithNewLine())): | |
| 962 indentation = 0 | |
| 963 if previous_node: | |
| 964 indentation = previous_node.TrimEndingSpaces() | |
| 965 if next_node: | |
| 966 next_node.TrimStartingNewLine() | |
| 967 rendered_node = _IndentedNode(node, indentation) | |
| 968 else: | |
| 969 rendered_node = _InlineNode(node) | |
| 970 | |
| 971 nodes[i] = rendered_node | |
| 972 | |
| 973 if len(nodes) == 0: | |
| 974 return None | |
| 975 if len(nodes) == 1: | |
| 976 return nodes[0] | |
| 977 return _NodeCollection(nodes) | |
| 978 | |
| 979 def _ParseNextOpenToken(self, tokens): | |
| 980 next_token = tokens.next_token | |
| 981 | |
| 982 if next_token is _Token.CHARACTER: | |
| 983 # Plain strings. | |
| 984 start_line = tokens.next_line | |
| 985 string = tokens.AdvanceOverNextString() | |
| 986 return [_StringNode(string, start_line, tokens.next_line)] | |
| 987 elif next_token in (_Token.OPEN_VARIABLE, | |
| 988 _Token.OPEN_UNESCAPED_VARIABLE, | |
| 989 _Token.OPEN_JSON): | |
| 990 # Inline nodes that don't take arguments. | |
| 991 tokens.Advance() | |
| 992 close_token = (_Token.CLOSE_MUSTACHE3 | |
| 993 if next_token is _Token.OPEN_UNESCAPED_VARIABLE else | |
| 994 _Token.CLOSE_MUSTACHE) | |
| 995 id_ = self._NextIdentifier(tokens) | |
| 996 tokens.AdvanceOver(close_token) | |
| 997 return [next_token.clazz(id_)] | |
| 998 elif next_token is _Token.OPEN_ASSERTION: | |
| 999 # Inline nodes that take arguments. | |
| 1000 tokens.Advance() | |
| 1001 id_ = self._NextIdentifier(tokens) | |
| 1002 node = next_token.clazz(id_, tokens.AdvanceOverNextString()) | |
| 1003 tokens.AdvanceOver(_Token.CLOSE_MUSTACHE) | |
| 1004 return [node] | |
| 1005 elif next_token in (_Token.OPEN_PARTIAL, | |
| 1006 _Token.OPEN_START_SECTION, | |
| 1007 _Token.OPEN_START_VERTED_SECTION, | |
| 1008 _Token.OPEN_START_INVERTED_SECTION): | |
| 1009 # Block nodes, though they may have inline syntax like {{#foo bar /}}. | |
| 1010 tokens.Advance() | |
| 1011 bind_to, id_ = None, self._NextIdentifier(tokens) | |
| 1012 if tokens.NextCharacter() == ':': | |
| 1013 # This section has the format {{#bound:id}} as opposed to just {{id}}. | |
| 1014 # That is, |id_| is actually the identifier to bind what the section | |
| 1015 # is producing, not the identifier of where to find that content. | |
| 1016 tokens.AdvanceOverSeparator(':') | |
| 1017 bind_to, id_ = id_, self._NextIdentifier(tokens) | |
| 1018 partial_args = None | |
| 1019 if next_token is _Token.OPEN_PARTIAL: | |
| 1020 partial_args = self._ParsePartialNodeArgs(tokens) | |
| 1021 if tokens.next_token is not _Token.CLOSE_MUSTACHE: | |
| 1022 # Inline syntax for partial types. | |
| 1023 if bind_to is not None: | |
| 1024 raise ParseException( | |
| 1025 'Cannot bind %s to a self-closing partial' % bind_to) | |
| 1026 tokens.AdvanceOver(_Token.INLINE_END_SECTION) | |
| 1027 partial_node = _PartialNode.Inline(id_) | |
| 1028 partial_node.SetArguments(partial_args) | |
| 1029 return [partial_node] | |
| 1030 elif tokens.next_token is not _Token.CLOSE_MUSTACHE: | |
| 1031 # Inline syntax for non-partial types. Support select node types: | |
| 1032 # variables, partials, JSON. | |
| 1033 line, column = tokens.next_line, (tokens.next_column + 1) | |
| 1034 name = tokens.AdvanceToNextWhitespace() | |
| 1035 clazz = _UnescapedVariableNode | |
| 1036 if name.startswith('*'): | |
| 1037 clazz = _JsonNode | |
| 1038 elif name.startswith('+'): | |
| 1039 clazz = _PartialNode.Inline | |
| 1040 if clazz is not _UnescapedVariableNode: | |
| 1041 name = name[1:] | |
| 1042 column += 1 | |
| 1043 inline_node = clazz(_Identifier(name, line, column)) | |
| 1044 if isinstance(inline_node, _PartialNode): | |
| 1045 inline_node.SetArguments(self._ParsePartialNodeArgs(tokens)) | |
| 1046 if bind_to is not None: | |
| 1047 inline_node.PassThroughArgument(bind_to) | |
| 1048 tokens.SkipWhitespace() | |
| 1049 tokens.AdvanceOver(_Token.INLINE_END_SECTION) | |
| 1050 return [next_token.clazz(bind_to, id_, inline_node)] | |
| 1051 # Block syntax. | |
| 1052 tokens.AdvanceOver(_Token.CLOSE_MUSTACHE) | |
| 1053 section = self._ParseSection(tokens) | |
| 1054 else_node_class = next_token.ElseNodeClass() # may not have one | |
| 1055 else_section = None | |
| 1056 if (else_node_class is not None and | |
| 1057 tokens.next_token is _Token.OPEN_ELSE): | |
| 1058 self._OpenElse(tokens, id_) | |
| 1059 else_section = self._ParseSection(tokens) | |
| 1060 self._CloseSection(tokens, id_) | |
| 1061 nodes = [] | |
| 1062 if section is not None: | |
| 1063 node = next_token.clazz(bind_to, id_, section) | |
| 1064 if partial_args: | |
| 1065 node.SetArguments(partial_args) | |
| 1066 nodes.append(node) | |
| 1067 if else_section is not None: | |
| 1068 nodes.append(else_node_class(bind_to, id_, else_section)) | |
| 1069 return nodes | |
| 1070 elif next_token is _Token.OPEN_COMMENT: | |
| 1071 # Comments. | |
| 1072 start_line = tokens.next_line | |
| 1073 self._AdvanceOverComment(tokens) | |
| 1074 return [_CommentNode(start_line, tokens.next_line)] | |
| 1075 | |
| 1076 def _AdvanceOverComment(self, tokens): | |
| 1077 tokens.AdvanceOver(_Token.OPEN_COMMENT) | |
| 1078 depth = 1 | |
| 1079 while tokens.HasNext() and depth > 0: | |
| 1080 if tokens.next_token is _Token.OPEN_COMMENT: | |
| 1081 depth += 1 | |
| 1082 elif tokens.next_token is _Token.CLOSE_COMMENT: | |
| 1083 depth -= 1 | |
| 1084 tokens.Advance() | |
| 1085 | |
| 1086 def _CloseSection(self, tokens, id_): | |
| 1087 tokens.AdvanceOver(_Token.OPEN_END_SECTION, | |
| 1088 description='to match %s' % id_.GetDescription()) | |
| 1089 next_string = tokens.AdvanceOverNextString() | |
| 1090 if next_string != '' and next_string != id_.name: | |
| 1091 raise ParseException( | |
| 1092 'Start section %s doesn\'t match end %s' % (id_, next_string)) | |
| 1093 tokens.AdvanceOver(_Token.CLOSE_MUSTACHE) | |
| 1094 | |
| 1095 def _OpenElse(self, tokens, id_): | |
| 1096 tokens.AdvanceOver(_Token.OPEN_ELSE) | |
| 1097 next_string = tokens.AdvanceOverNextString() | |
| 1098 if next_string != '' and next_string != id_.name: | |
| 1099 raise ParseException( | |
| 1100 'Start section %s doesn\'t match else %s' % (id_, next_string)) | |
| 1101 tokens.AdvanceOver(_Token.CLOSE_MUSTACHE) | |
| 1102 | |
| 1103 def _ParsePartialNodeArgs(self, tokens): | |
| 1104 args = {} | |
| 1105 tokens.SkipWhitespace() | |
| 1106 while (tokens.next_token is _Token.CHARACTER and | |
| 1107 tokens.NextCharacter() != ')'): | |
| 1108 key = tokens.AdvanceOverNextString(excluded=':') | |
| 1109 tokens.AdvanceOverSeparator(':') | |
| 1110 if tokens.NextCharacter() == '(': | |
| 1111 tokens.AdvanceOverSeparator('(') | |
| 1112 inner_id = self._NextIdentifier(tokens) | |
| 1113 inner_args = self._ParsePartialNodeArgs(tokens) | |
| 1114 tokens.AdvanceOverSeparator(')') | |
| 1115 args[key] = {inner_id: inner_args} | |
| 1116 else: | |
| 1117 args[key] = self._NextIdentifier(tokens) | |
| 1118 return args or None | |
| 1119 | |
| 1120 def _NextIdentifier(self, tokens): | |
| 1121 tokens.SkipWhitespace() | |
| 1122 column_start = tokens.next_column + 1 | |
| 1123 id_ = _Identifier(tokens.AdvanceOverNextString(excluded=' \n\r\t:()'), | |
| 1124 tokens.next_line, | |
| 1125 column_start) | |
| 1126 tokens.SkipWhitespace() | |
| 1127 return id_ | |
| 1128 | |
| 1129 def Render(self, *user_contexts): | |
| 1130 '''Renders this template given a variable number of contexts to read out | |
| 1131 values from (such as those appearing in {{foo}}). | |
| 1132 ''' | |
| 1133 internal_context = _InternalContext() | |
| 1134 contexts = list(user_contexts) | |
| 1135 contexts.append({ | |
| 1136 '_': internal_context, | |
| 1137 'false': False, | |
| 1138 'true': True, | |
| 1139 }) | |
| 1140 render_state = _RenderState(self._name or '<root>', _Contexts(contexts)) | |
| 1141 internal_context.SetRenderState(render_state) | |
| 1142 self._top_node.Render(render_state) | |
| 1143 return render_state.GetResult() | |
| 1144 | |
| 1145 def render(self, *contexts): | |
| 1146 return self.Render(*contexts) | |
| 1147 | |
| 1148 def __eq__(self, other): | |
| 1149 return self.source == other.source and self._name == other._name | |
| 1150 | |
| 1151 def __ne__(self, other): | |
| 1152 return not (self == other) | |
| 1153 | |
| 1154 def __repr__(self): | |
| 1155 return str('%s(%s)' % (type(self).__name__, self._top_node)) | |
| 1156 | |
| 1157 def __str__(self): | |
| 1158 return repr(self) | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 498813002:
Rename the docserver third_party dependency "handlebar" to "motemplate", as part (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master