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| 1 // Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file | |
| 2 // for details. All rights reserved. Use of this source code is governed by a | |
| 3 | |
| 4 class TagStack { | |
| 5 List<ASTNode> _stack; | |
| 6 | |
| 7 TagStack(var elem) : _stack = [] { | |
| 8 _stack.add(elem); | |
| 9 } | |
| 10 | |
| 11 void push(var elem) { | |
| 12 _stack.add(elem); | |
| 13 } | |
| 14 | |
| 15 ASTNode pop() { | |
| 16 return _stack.removeLast(); | |
| 17 } | |
| 18 | |
| 19 top() { | |
| 20 return _stack.last; | |
| 21 } | |
| 22 } | |
| 23 | |
| 24 // TODO(terry): Cleanup returning errors from CSS to common World error | |
| 25 // handler. | |
| 26 class ErrorMsgRedirector { | |
| 27 void displayError(String msg) { | |
| 28 if (world.printHandler != null) { | |
| 29 world.printHandler(msg); | |
| 30 } else { | |
| 31 print("Unhandler Error: ${msg}"); | |
| 32 } | |
| 33 world.errors++; | |
| 34 } | |
| 35 } | |
| 36 | |
| 37 /** | |
| 38 * A simple recursive descent parser for HTML. | |
| 39 */ | |
| 40 class Parser { | |
| 41 Tokenizer tokenizer; | |
| 42 | |
| 43 var _fs; // If non-null filesystem to read files. | |
| 44 | |
| 45 final SourceFile source; | |
| 46 | |
| 47 Token _previousToken; | |
| 48 Token _peekToken; | |
| 49 | |
| 50 PrintHandler printHandler; | |
| 51 | |
| 52 Parser(this.source, [int start = 0, this._fs = null]) { | |
| 53 tokenizer = new Tokenizer(source, true, start); | |
| 54 _peekToken = tokenizer.next(); | |
| 55 _previousToken = null; | |
| 56 } | |
| 57 | |
| 58 // Main entry point for parsing an entire HTML file. | |
| 59 List<Template> parse([PrintHandler handler = null]) { | |
| 60 printHandler = handler; | |
| 61 | |
| 62 List<Template> productions = []; | |
| 63 | |
| 64 int start = _peekToken.start; | |
| 65 while (!_maybeEat(TokenKind.END_OF_FILE)) { | |
| 66 Template template = processTemplate(); | |
| 67 if (template != null) { | |
| 68 productions.add(template); | |
| 69 } | |
| 70 } | |
| 71 | |
| 72 return productions; | |
| 73 } | |
| 74 | |
| 75 /** Generate an error if [source] has not been completely consumed. */ | |
| 76 void checkEndOfFile() { | |
| 77 _eat(TokenKind.END_OF_FILE); | |
| 78 } | |
| 79 | |
| 80 /** Guard to break out of parser when an unexpected end of file is found. */ | |
| 81 // TODO(jimhug): Failure to call this method can lead to inifinite parser | |
| 82 // loops. Consider embracing exceptions for more errors to reduce | |
| 83 // the danger here. | |
| 84 bool isPrematureEndOfFile() { | |
| 85 if (_maybeEat(TokenKind.END_OF_FILE)) { | |
| 86 _error('unexpected end of file', _peekToken.span); | |
| 87 return true; | |
| 88 } else { | |
| 89 return false; | |
| 90 } | |
| 91 } | |
| 92 | |
| 93 /////////////////////////////////////////////////////////////////// | |
| 94 // Basic support methods | |
| 95 /////////////////////////////////////////////////////////////////// | |
| 96 int _peek() { | |
| 97 return _peekToken.kind; | |
| 98 } | |
| 99 | |
| 100 Token _next([bool inTag = true]) { | |
| 101 _previousToken = _peekToken; | |
| 102 _peekToken = tokenizer.next(inTag); | |
| 103 return _previousToken; | |
| 104 } | |
| 105 | |
| 106 bool _peekKind(int kind) { | |
| 107 return _peekToken.kind == kind; | |
| 108 } | |
| 109 | |
| 110 /* Is the next token a legal identifier? This includes pseudo-keywords. */ | |
| 111 bool _peekIdentifier([String name = null]) { | |
| 112 if (TokenKind.isIdentifier(_peekToken.kind)) { | |
| 113 return (name != null) ? _peekToken.text == name : true; | |
| 114 } | |
| 115 | |
| 116 return false; | |
| 117 } | |
| 118 | |
| 119 bool _maybeEat(int kind) { | |
| 120 if (_peekToken.kind == kind) { | |
| 121 _previousToken = _peekToken; | |
| 122 if (kind == TokenKind.GREATER_THAN) { | |
| 123 _peekToken = tokenizer.next(false); | |
| 124 } else { | |
| 125 _peekToken = tokenizer.next(); | |
| 126 } | |
| 127 return true; | |
| 128 } else { | |
| 129 return false; | |
| 130 } | |
| 131 } | |
| 132 | |
| 133 void _eat(int kind) { | |
| 134 if (!_maybeEat(kind)) { | |
| 135 _errorExpected(TokenKind.kindToString(kind)); | |
| 136 } | |
| 137 } | |
| 138 | |
| 139 void _eatSemicolon() { | |
| 140 _eat(TokenKind.SEMICOLON); | |
| 141 } | |
| 142 | |
| 143 void _errorExpected(String expected) { | |
| 144 var tok = _next(); | |
| 145 var message; | |
| 146 try { | |
| 147 message = 'expected $expected, but found $tok'; | |
| 148 } catch (e) { | |
| 149 message = 'parsing error expected $expected'; | |
| 150 } | |
| 151 _error(message, tok.span); | |
| 152 } | |
| 153 | |
| 154 void _error(String message, [SourceSpan location=null]) { | |
| 155 if (location == null) { | |
| 156 location = _peekToken.span; | |
| 157 } | |
| 158 | |
| 159 if (printHandler == null) { | |
| 160 world.fatal(message, location); // syntax errors are fatal for now | |
| 161 } else { | |
| 162 // TODO(terry): Need common World view for css and template parser. | |
| 163 // For now this is how we return errors from CSS - ugh. | |
| 164 printHandler(message); | |
| 165 } | |
| 166 } | |
| 167 | |
| 168 void _warning(String message, [SourceSpan location=null]) { | |
| 169 if (location == null) { | |
| 170 location = _peekToken.span; | |
| 171 } | |
| 172 | |
| 173 if (printHandler == null) { | |
| 174 world.warning(message, location); | |
| 175 } else { | |
| 176 // TODO(terry): Need common World view for css and template parser. | |
| 177 // For now this is how we return errors from CSS - ugh. | |
| 178 printHandler(message); | |
| 179 } | |
| 180 } | |
| 181 | |
| 182 SourceSpan _makeSpan(int start) { | |
| 183 return new SourceSpan(source, start, _previousToken.end); | |
| 184 } | |
| 185 | |
| 186 /////////////////////////////////////////////////////////////////// | |
| 187 // Top level productions | |
| 188 /////////////////////////////////////////////////////////////////// | |
| 189 | |
| 190 Template processTemplate() { | |
| 191 var template; | |
| 192 | |
| 193 int start = _peekToken.start; | |
| 194 | |
| 195 // Handle the template keyword followed by template signature. | |
| 196 _eat(TokenKind.TEMPLATE_KEYWORD); | |
| 197 | |
| 198 if (_peekIdentifier()) { | |
| 199 final templateName = identifier(); | |
| 200 | |
| 201 List<Map<Identifier, Identifier>> params = | |
| 202 new List<Map<Identifier, Identifier>>(); | |
| 203 | |
| 204 _eat(TokenKind.LPAREN); | |
| 205 | |
| 206 start = _peekToken.start; | |
| 207 while (true) { | |
| 208 // TODO(terry): Need robust Dart argument parser (e.g., | |
| 209 // List<String> arg1, etc). | |
| 210 var type = processAsIdentifier(); | |
| 211 var paramName = processAsIdentifier(); | |
| 212 if (type != null && paramName != null) { | |
| 213 params.add({'type': type, 'name' : paramName}); | |
| 214 | |
| 215 if (!_maybeEat(TokenKind.COMMA)) { | |
| 216 break; | |
| 217 } | |
| 218 } else { | |
| 219 // No parameters we're done. | |
| 220 break; | |
| 221 } | |
| 222 } | |
| 223 | |
| 224 _eat(TokenKind.RPAREN); | |
| 225 | |
| 226 TemplateSignature sig = | |
| 227 new TemplateSignature(templateName.name, params, _makeSpan(start)); | |
| 228 | |
| 229 TemplateContent content = processTemplateContent(); | |
| 230 | |
| 231 template = new Template(sig, content, _makeSpan(start)); | |
| 232 } | |
| 233 | |
| 234 return template; | |
| 235 } | |
| 236 | |
| 237 // All tokens are identifiers tokenizer is geared to HTML if identifiers are | |
| 238 // HTML element or attribute names we need them as an identifier. Used by | |
| 239 // template signatures and expressions in ${...} | |
| 240 Identifier processAsIdentifier() { | |
| 241 int start = _peekToken.start; | |
| 242 | |
| 243 if (_peekIdentifier()) { | |
| 244 return identifier(); | |
| 245 } else if (TokenKind.validTagName(_peek())) { | |
| 246 var tok = _next(); | |
| 247 return new Identifier(TokenKind.tagNameFromTokenId(tok.kind), | |
| 248 _makeSpan(start)); | |
| 249 } | |
| 250 } | |
| 251 | |
| 252 css.Stylesheet processCSS() { | |
| 253 // Is there a CSS block? | |
| 254 if (_peekIdentifier('css')) { | |
| 255 _next(); | |
| 256 | |
| 257 int start = _peekToken.start; | |
| 258 _eat(TokenKind.LBRACE); | |
| 259 | |
| 260 css.Stylesheet cssCtx = processCSSContent(source, tokenizer.startIndex); | |
| 261 | |
| 262 // TODO(terry): Hack, restart template parser where CSS parser stopped. | |
| 263 tokenizer.index = lastCSSIndexParsed; | |
| 264 _next(false); | |
| 265 | |
| 266 _eat(TokenKind.RBRACE); // close } of css block | |
| 267 | |
| 268 return cssCtx; | |
| 269 } | |
| 270 } | |
| 271 | |
| 272 // TODO(terry): get should be able to use all template control flow but return | |
| 273 // a string instead of a node. Maybe expose both html and get | |
| 274 // e.g., | |
| 275 // | |
| 276 // A.) | |
| 277 // html { | |
| 278 // <div>...</div> | |
| 279 // } | |
| 280 // | |
| 281 // B.) | |
| 282 // html foo() { | |
| 283 // <div>..</div> | |
| 284 // } | |
| 285 // | |
| 286 // C.) | |
| 287 // get { | |
| 288 // <div>...</div> | |
| 289 // } | |
| 290 // | |
| 291 // D.) | |
| 292 // get foo { | |
| 293 // <div>..</div> | |
| 294 // } | |
| 295 // | |
| 296 // Only one default allower either A or C the constructor will | |
| 297 // generate a string or a node. | |
| 298 // Examples B and D would generate getters that either return | |
| 299 // a node for B or a String for D. | |
| 300 // | |
| 301 List<TemplateGetter> processGetters() { | |
| 302 List<TemplateGetter> getters = []; | |
| 303 | |
| 304 while (true) { | |
| 305 if (_peekIdentifier('get')) { | |
| 306 _next(); | |
| 307 | |
| 308 int start = _peekToken.start; | |
| 309 if (_peekIdentifier()) { | |
| 310 String getterName = identifier().name; | |
| 311 | |
| 312 List<Map<Identifier, Identifier>> params = | |
| 313 new List<Map<Identifier, Identifier>>(); | |
| 314 | |
| 315 _eat(TokenKind.LPAREN); | |
| 316 | |
| 317 start = _peekToken.start; | |
| 318 while (true) { | |
| 319 // TODO(terry): Need robust Dart argument parser (e.g., | |
| 320 // List<String> arg1, etc). | |
| 321 var type = processAsIdentifier(); | |
| 322 var paramName = processAsIdentifier(); | |
| 323 if (paramName == null && type != null) { | |
| 324 paramName = type; | |
| 325 type = ""; | |
| 326 } | |
| 327 if (type != null && paramName != null) { | |
| 328 params.add({'type': type, 'name' : paramName}); | |
| 329 | |
| 330 if (!_maybeEat(TokenKind.COMMA)) { | |
| 331 break; | |
| 332 } | |
| 333 } else { | |
| 334 // No parameters we're done. | |
| 335 break; | |
| 336 } | |
| 337 } | |
| 338 | |
| 339 _eat(TokenKind.RPAREN); | |
| 340 | |
| 341 _eat(TokenKind.LBRACE); | |
| 342 | |
| 343 var elems = new TemplateElement.fragment(_makeSpan(_peekToken.start)); | |
| 344 var templateDoc = processHTML(elems); | |
| 345 | |
| 346 _eat(TokenKind.RBRACE); // close } of get block | |
| 347 | |
| 348 getters.add(new TemplateGetter(getterName, params, templateDoc, | |
| 349 _makeSpan(_peekToken.start))); | |
| 350 } | |
| 351 } else { | |
| 352 break; | |
| 353 } | |
| 354 } | |
| 355 | |
| 356 return getters; | |
| 357 | |
| 358 /* | |
| 359 get newTotal(value) { | |
| 360 <div class="alignleft">${value}</div> | |
| 361 } | |
| 362 | |
| 363 String get HTML_newTotal(value) { | |
| 364 return '<div class="alignleft">${value}</div> | |
| 365 } | |
| 366 | |
| 367 */ | |
| 368 } | |
| 369 | |
| 370 TemplateContent processTemplateContent() { | |
| 371 css.Stylesheet ss; | |
| 372 | |
| 373 _eat(TokenKind.LBRACE); | |
| 374 | |
| 375 int start = _peekToken.start; | |
| 376 | |
| 377 ss = processCSS(); | |
| 378 | |
| 379 // TODO(terry): getters should be allowed anywhere not just after CSS. | |
| 380 List<TemplateGetter> getters = processGetters(); | |
| 381 | |
| 382 var elems = new TemplateElement.fragment(_makeSpan(_peekToken.start)); | |
| 383 var templateDoc = processHTML(elems); | |
| 384 | |
| 385 // TODO(terry): Should allow css { } to be at beginning or end of the | |
| 386 // template's content. Today css only allow at beginning | |
| 387 // because the css {...} is sucked in as a text node. We'll | |
| 388 // need a special escape for css maybe: | |
| 389 // | |
| 390 // ${#css} | |
| 391 // ${/css} | |
| 392 // | |
| 393 // uggggly! | |
| 394 | |
| 395 | |
| 396 _eat(TokenKind.RBRACE); | |
| 397 | |
| 398 return new TemplateContent(ss, templateDoc, getters, _makeSpan(start)); | |
| 399 } | |
| 400 | |
| 401 int lastCSSIndexParsed; // TODO(terry): Hack, last good CSS parsed. | |
| 402 | |
| 403 css.Stylesheet processCSSContent(var cssSource, int start) { | |
| 404 try { | |
| 405 css.Parser parser = new css.Parser(new SourceFile( | |
| 406 SourceFile.IN_MEMORY_FILE, cssSource.text), start); | |
| 407 | |
| 408 css.Stylesheet stylesheet = parser.parse(false, new ErrorMsgRedirector()); | |
| 409 | |
| 410 var lastParsedChar = parser.tokenizer.startIndex; | |
| 411 | |
| 412 lastCSSIndexParsed = lastParsedChar; | |
| 413 | |
| 414 return stylesheet; | |
| 415 } catch (cssParseException) { | |
| 416 // TODO(terry): Need SourceSpan from CSS parser to pass onto _error. | |
| 417 _error("Unexcepted CSS error: ${cssParseException.toString()}"); | |
| 418 } | |
| 419 } | |
| 420 | |
| 421 /* TODO(terry): Assume template { }, single close curley as a text node | |
| 422 * inside of the template would need to be escaped maybe \} | |
| 423 */ | |
| 424 processHTML(TemplateElement root) { | |
| 425 assert(root.isFragment); | |
| 426 TagStack stack = new TagStack(root); | |
| 427 | |
| 428 int start = _peekToken.start; | |
| 429 | |
| 430 bool done = false; | |
| 431 while (!done) { | |
| 432 if (_maybeEat(TokenKind.LESS_THAN)) { | |
| 433 // Open tag | |
| 434 start = _peekToken.start; | |
| 435 | |
| 436 if (TokenKind.validTagName(_peek())) { | |
| 437 Token tagToken = _next(); | |
| 438 | |
| 439 Map<String, TemplateAttribute> attrs = processAttributes(); | |
| 440 | |
| 441 String varName; | |
| 442 if (attrs.containsKey('var')) { | |
| 443 varName = attrs['var'].value; | |
| 444 attrs.remove('var'); | |
| 445 } | |
| 446 | |
| 447 int scopeType; // 1 implies scoped, 2 implies non-scoped element. | |
| 448 if (_maybeEat(TokenKind.GREATER_THAN)) { | |
| 449 // Scoped unless the tag is explicitly known as an unscoped tag | |
| 450 // e.g., <br>. | |
| 451 scopeType = TokenKind.unscopedTag(tagToken.kind) ? 2 : 1; | |
| 452 } else if (_maybeEat(TokenKind.END_NO_SCOPE_TAG)) { | |
| 453 scopeType = 2; | |
| 454 } | |
| 455 if (scopeType > 0) { | |
| 456 var elem = new TemplateElement.attributes(tagToken.kind, | |
| 457 attrs.values.toList(), varName, _makeSpan(start)); | |
| 458 stack.top().add(elem); | |
| 459 | |
| 460 if (scopeType == 1) { | |
| 461 // Maybe more nested tags/text? | |
| 462 stack.push(elem); | |
| 463 } | |
| 464 } | |
| 465 } else { | |
| 466 // Close tag | |
| 467 _eat(TokenKind.SLASH); | |
| 468 if (TokenKind.validTagName(_peek())) { | |
| 469 Token tagToken = _next(); | |
| 470 | |
| 471 _eat(TokenKind.GREATER_THAN); | |
| 472 | |
| 473 var elem = stack.pop(); | |
| 474 if (elem is TemplateElement && !elem.isFragment) { | |
| 475 if (elem.tagTokenId != tagToken.kind) { | |
| 476 _error('Tag doesn\'t match expected </${elem.tagName}> got ' + | |
| 477 '</${TokenKind.tagNameFromTokenId(tagToken.kind)}>'); | |
| 478 } | |
| 479 } else { | |
| 480 // Too many end tags. | |
| 481 _error('Too many end tags at ' + | |
| 482 '</${TokenKind.tagNameFromTokenId(tagToken.kind)}>'); | |
| 483 } | |
| 484 } | |
| 485 } | |
| 486 } else if (_maybeEat(TokenKind.START_COMMAND)) { | |
| 487 Identifier commandName = processAsIdentifier(); | |
| 488 if (commandName != null) { | |
| 489 switch (commandName.name) { | |
| 490 case "each": | |
| 491 case "with": | |
| 492 var listName = processAsIdentifier(); | |
| 493 if (listName != null) { | |
| 494 var loopItem = processAsIdentifier(); | |
| 495 // Is the optional item name specified? | |
| 496 // #each lists [item] | |
| 497 // #with expression [item] | |
| 498 | |
| 499 _eat(TokenKind.RBRACE); | |
| 500 | |
| 501 var frag = new TemplateElement.fragment( | |
| 502 _makeSpan(_peekToken.start)); | |
| 503 TemplateDocument docFrag = processHTML(frag); | |
| 504 | |
| 505 if (docFrag != null) { | |
| 506 var span = _makeSpan(start); | |
| 507 var cmd; | |
| 508 if (commandName.name == "each") { | |
| 509 cmd = new TemplateEachCommand(listName, loopItem, docFrag, | |
| 510 span); | |
| 511 } else if (commandName.name == "with") { | |
| 512 cmd = new TemplateWithCommand(listName, loopItem, docFrag, | |
| 513 span); | |
| 514 } | |
| 515 | |
| 516 stack.top().add(cmd); | |
| 517 stack.push(cmd); | |
| 518 } | |
| 519 | |
| 520 // Process ${/commandName} | |
| 521 _eat(TokenKind.END_COMMAND); | |
| 522 | |
| 523 // Close command ${/commandName} | |
| 524 if (_peekIdentifier()) { | |
| 525 commandName = identifier(); | |
| 526 switch (commandName.name) { | |
| 527 case "each": | |
| 528 case "with": | |
| 529 case "if": | |
| 530 case "else": | |
| 531 break; | |
| 532 default: | |
| 533 _error('Unknown command \${#${commandName}}'); | |
| 534 } | |
| 535 var elem = stack.pop(); | |
| 536 if (elem is TemplateEachCommand && | |
| 537 commandName.name == "each") { | |
| 538 | |
| 539 } else if (elem is TemplateWithCommand && | |
| 540 commandName.name == "with") { | |
| 541 | |
| 542 } /*else if (elem is TemplateIfCommand && commandName == "if")
{ | |
| 543 | |
| 544 } | |
| 545 */else { | |
| 546 String expectedCmd; | |
| 547 if (elem is TemplateEachCommand) { | |
| 548 expectedCmd = "\${/each}"; | |
| 549 } /* TODO(terry): else other commands as well */ | |
| 550 _error('mismatched command expected ${expectedCmd} got...'); | |
| 551 return; | |
| 552 } | |
| 553 _eat(TokenKind.RBRACE); | |
| 554 } else { | |
| 555 _error('Missing command name \${/commandName}'); | |
| 556 } | |
| 557 } else { | |
| 558 _error("Missing listname for #each command"); | |
| 559 } | |
| 560 break; | |
| 561 case "if": | |
| 562 break; | |
| 563 case "else": | |
| 564 break; | |
| 565 default: | |
| 566 // Calling another template. | |
| 567 int startPos = this._previousToken.end; | |
| 568 // Gobble up everything until we hit } | |
| 569 while (_peek() != TokenKind.RBRACE && | |
| 570 _peek() != TokenKind.END_OF_FILE) { | |
| 571 _next(false); | |
| 572 } | |
| 573 | |
| 574 if (_peek() == TokenKind.RBRACE) { | |
| 575 int endPos = this._previousToken.end; | |
| 576 TemplateCall callNode = new TemplateCall(commandName.name, | |
| 577 source.text.substring(startPos, endPos), _makeSpan(start)); | |
| 578 stack.top().add(callNode); | |
| 579 | |
| 580 _next(false); | |
| 581 } else { | |
| 582 _error("Unknown template command"); | |
| 583 } | |
| 584 } // End of switch/case | |
| 585 } | |
| 586 } else if (_peekKind(TokenKind.END_COMMAND)) { | |
| 587 break; | |
| 588 } else { | |
| 589 // Any text or expression nodes? | |
| 590 var nodes = processTextNodes(); | |
| 591 if (nodes.length > 0) { | |
| 592 assert(stack.top() != null); | |
| 593 for (var node in nodes) { | |
| 594 stack.top().add(node); | |
| 595 } | |
| 596 } else { | |
| 597 break; | |
| 598 } | |
| 599 } | |
| 600 } | |
| 601 /* | |
| 602 if (elems.children.length != 1) { | |
| 603 print("ERROR: No closing end-tag for elems ${elems[elems.length - 1]}"); | |
| 604 } | |
| 605 */ | |
| 606 var docChildren = new List<ASTNode>(); | |
| 607 docChildren.add(stack.pop()); | |
| 608 return new TemplateDocument(docChildren, _makeSpan(start)); | |
| 609 } | |
| 610 | |
| 611 /* Map is used so only last unique attribute name is remembered and to quickly | |
| 612 * find the var attribute. | |
| 613 */ | |
| 614 Map<String, TemplateAttribute> processAttributes() { | |
| 615 Map<String, TemplateAttribute> attrs = new Map(); | |
| 616 | |
| 617 int start = _peekToken.start; | |
| 618 String elemName; | |
| 619 while (_peekIdentifier() || | |
| 620 (elemName = TokenKind.tagNameFromTokenId(_peek())) != null) { | |
| 621 var attrName; | |
| 622 if (elemName == null) { | |
| 623 attrName = identifier(); | |
| 624 } else { | |
| 625 attrName = new Identifier(elemName, _makeSpan(start)); | |
| 626 _next(); | |
| 627 } | |
| 628 | |
| 629 var attrValue; | |
| 630 | |
| 631 // Attribute value? | |
| 632 if (_peek() == TokenKind.ATTR_VALUE) { | |
| 633 var tok = _next(); | |
| 634 attrValue = new StringValue(tok.value, _makeSpan(tok.start)); | |
| 635 } | |
| 636 | |
| 637 attrs[attrName.name] = | |
| 638 new TemplateAttribute(attrName, attrValue, _makeSpan(start)); | |
| 639 | |
| 640 start = _peekToken.start; | |
| 641 elemName = null; | |
| 642 } | |
| 643 | |
| 644 return attrs; | |
| 645 } | |
| 646 | |
| 647 identifier() { | |
| 648 var tok = _next(); | |
| 649 if (!TokenKind.isIdentifier(tok.kind)) { | |
| 650 _error('expected identifier, but found $tok', tok.span); | |
| 651 } | |
| 652 | |
| 653 return new Identifier(tok.text, _makeSpan(tok.start)); | |
| 654 } | |
| 655 | |
| 656 List<ASTNode> processTextNodes() { | |
| 657 // May contain TemplateText and TemplateExpression. | |
| 658 List<ASTNode> nodes = []; | |
| 659 | |
| 660 int start = _peekToken.start; | |
| 661 bool inExpression = false; | |
| 662 StringBuffer stringValue = new StringBuffer(); | |
| 663 | |
| 664 // Any text chars between close of tag and text node? | |
| 665 if (_previousToken.kind == TokenKind.GREATER_THAN) { | |
| 666 // If the next token is } could be the close template token. If user | |
| 667 // needs } as token in text node use the entity &125; | |
| 668 // TODO(terry): Probably need a &RCURLY entity instead of 125. | |
| 669 if (_peek() == TokenKind.ERROR) { | |
| 670 // Backup, just past previous token, & rescan we're outside of the tag. | |
| 671 tokenizer.index = _previousToken.end; | |
| 672 _next(false); | |
| 673 } else if (_peek() != TokenKind.RBRACE) { | |
| 674 // Yes, grab the chars after the > | |
| 675 stringValue.write(_previousToken.source.text.substring( | |
| 676 this._previousToken.end, this._peekToken.start)); | |
| 677 } | |
| 678 } | |
| 679 | |
| 680 // Gobble up everything until we hit < | |
| 681 while (_peek() != TokenKind.LESS_THAN && | |
| 682 _peek() != TokenKind.START_COMMAND && | |
| 683 _peek() != TokenKind.END_COMMAND && | |
| 684 (_peek() != TokenKind.RBRACE || | |
| 685 (_peek() == TokenKind.RBRACE && inExpression)) && | |
| 686 _peek() != TokenKind.END_OF_FILE) { | |
| 687 | |
| 688 // Beginning of expression? | |
| 689 if (_peek() == TokenKind.START_EXPRESSION) { | |
| 690 if (stringValue.length > 0) { | |
| 691 // We have a real text node create the text node. | |
| 692 nodes.add(new TemplateText(stringValue.toString(), _makeSpan(start))); | |
| 693 stringValue = new StringBuffer(); | |
| 694 start = _peekToken.start; | |
| 695 } | |
| 696 inExpression = true; | |
| 697 } | |
| 698 | |
| 699 var tok = _next(false); | |
| 700 if (tok.kind == TokenKind.RBRACE && inExpression) { | |
| 701 // We have an expression create the expression node, don't save the } | |
| 702 inExpression = false; | |
| 703 nodes.add(new TemplateExpression(stringValue.toString(), | |
| 704 _makeSpan(start))); | |
| 705 stringValue = new StringBuffer(); | |
| 706 start = _peekToken.start; | |
| 707 } else if (tok.kind != TokenKind.START_EXPRESSION) { | |
| 708 // Only save the the contents between ${ and } | |
| 709 stringValue.write(tok.text); | |
| 710 } | |
| 711 } | |
| 712 | |
| 713 if (stringValue.length > 0) { | |
| 714 nodes.add(new TemplateText(stringValue.toString(), _makeSpan(start))); | |
| 715 } | |
| 716 | |
| 717 return nodes; | |
| 718 } | |
| 719 | |
| 720 } | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 137013002:
Removed obsolete code (Closed)
Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart