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| 1 | <!DOCTYPE HTML> |
| 2 | <html lang=en> |
| 3 | <head> |
| 4 | <title>Live Scripting HTML Parser</title> |
| 5 | <link rel=author href="http://suika.fam.cx/~wakaba/who?"> |
| 6 | <link rel=license href="http://suika.fam.cx/c/gnu/gpl" |
| 7 | title="GNU GPL2 or later"> |
| 8 | <style> |
| 9 | h1 { |
| 10 | margin: 0; |
| 11 | font-size: 150%; |
| 12 | } |
| 13 | h2 { |
| 14 | margin: 0; |
| 15 | font-size: 100%; |
| 16 | } |
| 17 | p { |
| 18 | margin: 0 1em; |
| 19 | } |
| 20 | textarea { |
| 21 | width: 100%; |
| 22 | -width: 99%; |
| 23 | height: 10em; |
| 24 | } |
| 25 | output { |
| 26 | display: block; |
| 27 | font-family: monospace; |
| 28 | white-space: -moz-pre-wrap; |
| 29 | white-space: pre-wrap; |
| 30 | } |
| 31 | </style> |
| 32 | <script> |
| 33 | var delayedUpdater = 0; |
| 34 | |
| 35 | function update () { |
| 36 | if (delayedUpdater) { |
| 37 | clearTimeout (delayedUpdater); |
| 38 | delayedUpdater = 0; |
| 39 | } |
| 40 | delayedUpdater = setTimeout (update2, 100); |
| 41 | } // update |
| 42 | |
| 43 | function update2 () { |
| 44 | var v = document.sourceElement.value; |
| 45 | if (v != document.previousSourceText) { |
| 46 | document.previousSourceText = v; |
| 47 | document.links['permalink'].href |
| 48 | = location.pathname + '?s=' + encodeURIComponent (v); |
| 49 | document.links['ldvlink'].href |
| 50 | = 'http://software.hixie.ch/utilities/js/live-dom-viewer/?' |
| 51 | + encodeURIComponent (v); |
| 52 | |
| 53 | document.logElement.textContent = ''; |
| 54 | var p = new Parser (new InputStream (v)); |
| 55 | var doc = p.doc; |
| 56 | p.parse (); |
| 57 | |
| 58 | log (dumpTree (doc, '')); |
| 59 | |
| 60 | if (p.hasAsyncScript) { |
| 61 | log ('Some script codes are executed asynchronously; it means that the document might be rendered in different ways depending on the network condition and other factors'); |
| 62 | } |
| 63 | } |
| 64 | } // update2 |
| 65 | |
| 66 | var logIndentLevel = 0; |
| 67 | function log (s) { |
| 68 | var indent = ''; |
| 69 | for (var i = 0; i < logIndentLevel; i++) { |
| 70 | indent += ' '; |
| 71 | } |
| 72 | s = indent + s.replace (/\n/g, "\n" + indent); |
| 73 | document.logElement.appendChild (document.createTextNode (s + "\n")); |
| 74 | } // log |
| 75 | |
| 76 | function InputStream (s) { |
| 77 | this.s = s; |
| 78 | } // InputStream |
| 79 | |
| 80 | function Parser (i, doc) { |
| 81 | this.parseMode = 'pcdata'; |
| 82 | if (!doc) { |
| 83 | doc = new JSDocument (this); |
| 84 | doc.manakaiIsHTML = true; |
| 85 | } |
| 86 | this.nextToken = []; |
| 87 | this.doc = doc; |
| 88 | this.openElements = [doc]; |
| 89 | this.input = i; |
| 90 | this.scriptsExecutedAfterParsing = []; |
| 91 | this.scriptsExecutedSoon = []; |
| 92 | this.scriptsExecutedAsynchronously = []; |
| 93 | } // Parser |
| 94 | |
| 95 | Parser.prototype.getNextToken = function () { |
| 96 | if (this.nextToken.length) { |
| 97 | return this.nextToken.shift (); |
| 98 | } |
| 99 | |
| 100 | var p = this; |
| 101 | var i = this.input; |
| 102 | if (this.parseMode == 'cdata') { |
| 103 | var tagName = this.endTagName; |
| 104 | var token; |
| 105 | if (p.insertionPoint <= 0) { |
| 106 | return {type: 'abort'}; |
| 107 | } |
| 108 | i.s = i.s.replace (/^([^<]+)/, |
| 109 | function (s, t) { |
| 110 | if (0 < p.insertionPoint && p.insertionPoint < t.length) { |
| 111 | token = {type: 'char', value: t.substring (0, p.insertionPoint)}; |
| 112 | var ip = p.insertionPoint; |
| 113 | p.insertionPoint = 0; |
| 114 | return t.substring (ip, t.length); |
| 115 | } |
| 116 | token = {type: 'char', value: t}; |
| 117 | p.insertionPoint -= t.length; |
| 118 | return ''; |
| 119 | }); |
| 120 | if (token) return token; |
| 121 | var pattern = new RegExp ('^</' + tagName + '>', 'i'); |
| 122 | i.s = i.s.replace (pattern, function (s) { |
| 123 | if (p.insertionPoint < s.length) { |
| 124 | token = {type: 'abort'}; |
| 125 | return s; |
| 126 | } |
| 127 | token = {type: 'end-tag', value: tagName}; |
| 128 | p.insertionPoint -= s.length; |
| 129 | return ''; |
| 130 | }); |
| 131 | if (token) return token; |
| 132 | var m; |
| 133 | if ((p.insertionPoint < ('</' + tagName).length) && |
| 134 | (m = i.s.match (/^<\/([A-Za-z]+)/))) { |
| 135 | var v = m[1].substring (0, p.insertionPoint).toLowerCase (); |
| 136 | if (v == tagName.substring (0, p.insertionPoint - '</'.length)) { |
| 137 | return {type: 'abort'}; |
| 138 | } |
| 139 | } |
| 140 | i.s = i.s.replace (/^</, |
| 141 | function (s) { |
| 142 | token = {type: 'char', value: s}; |
| 143 | p.insertionPoint -= s.length; |
| 144 | return ''; |
| 145 | }); |
| 146 | if (token) return token; |
| 147 | return {type: 'eof'}; |
| 148 | } |
| 149 | |
| 150 | var token; |
| 151 | i.s = i.s.replace (/^<\/([^>]+)(?:>|$)/, function (s, e) { |
| 152 | if (p.insertionPoint < s.length || |
| 153 | (p.insertionPoint <= s.length && |
| 154 | s.substring (s.length - 1, s.length) != '>')) { |
| 155 | token = {type: 'abort'}; |
| 156 | return s; |
| 157 | } |
| 158 | token = {type: 'end-tag', value: e.toLowerCase ()}; |
| 159 | p.insertionPoint -= s.length; |
| 160 | return ''; |
| 161 | }); |
| 162 | if (token) return token; |
| 163 | i.s = i.s.replace (/^<([^>]+)(?:>|$)/, function (s, e) { |
| 164 | if (p.insertionPoint < s.length || |
| 165 | (p.insertionPoint <= s.length && |
| 166 | s.substring (s.length - 1, s.length) != '>')) { |
| 167 | token = {type: 'abort'}; |
| 168 | return s; |
| 169 | } |
| 170 | var tagName; |
| 171 | var attrs = {}; |
| 172 | e = e.replace (/^[\S]+/, function (v) { |
| 173 | tagName = v.toLowerCase (); |
| 174 | return ''; |
| 175 | }); |
| 176 | while (true) { |
| 177 | var m = false; |
| 178 | e = e.replace (/^\s*([^\s=]+)\s*(?:=\s*(?:"([^"]*)"|'([^']*)'|([^"'\s]*)))?/, |
| 179 | function (x, attrName, attrValue1, attrValue2, attrValue3) { |
| 180 | v = attrValue1 || attrValue2 || attrValue3; |
| 181 | v = v.replace (/"/g, '"').replace (/'/g, "'") |
| 182 | .replace (/&/g, '&'); |
| 183 | attrs[attrName.toLowerCase ()] = v; |
| 184 | m = true; |
| 185 | return ''; |
| 186 | }); |
| 187 | if (!m) break; |
| 188 | } |
| 189 | if (e.length) { |
| 190 | log ('Broken start tag: "' + e + '"'); |
| 191 | } |
| 192 | token = {type: 'start-tag', value: tagName, attrs: attrs}; |
| 193 | p.insertionPoint -= s.length; |
| 194 | return ''; |
| 195 | }); |
| 196 | if (token) return token; |
| 197 | if (p.insertionPoint <= 0) { |
| 198 | return {type: 'abort'}; |
| 199 | } |
| 200 | i.s = i.s.replace (/^[^<]+/, function (s) { |
| 201 | if (p.insertionPoint < s.length) { |
| 202 | token = {type: 'char', value: s.substring (0, p.insertionPoint)}; |
| 203 | var ip = p.insertionPoint; |
| 204 | p.insertionPoint = 0; |
| 205 | return s.substring (ip, s.length); |
| 206 | } |
| 207 | token = {type: 'char', value: s}; |
| 208 | p.insertionPoint -= s.length; |
| 209 | return ''; |
| 210 | }); |
| 211 | if (token) return token; |
| 212 | i.s = i.s.replace (/^[\s\S]/, function (s) { |
| 213 | token = {type: 'char', value: s}; |
| 214 | p.insertionPoint -= s.length; |
| 215 | return ''; |
| 216 | }); |
| 217 | if (token) return token; |
| 218 | return {type: 'eof'}; |
| 219 | } // getNextToken |
| 220 | |
| 221 | Parser.prototype.parse = function () { |
| 222 | logIndentLevel++; |
| 223 | log ('parse: start'); |
| 224 | |
| 225 | while (true) { |
| 226 | var token = this.getNextToken (); |
| 227 | log ('token: ' + token.type + ' "' + token.value + '"'); |
| 228 | |
| 229 | if (this.cdataEndTagRequired) { |
| 230 | // Generic CDATA parsing algorithm |
| 231 | |
| 232 | if (token.type != 'abort') { |
| 233 | // 7. |
| 234 | if (token.type == 'end-tag' && token.value == this.endTagName) { |
| 235 | // 7.1. Ignores it. |
| 236 | // |
| 237 | } else { |
| 238 | // 7.2. Parse error. |
| 239 | log ('Parse error: no </' + this.endTagName + '>'); |
| 240 | this.nextToken.unshift (token); |
| 241 | } |
| 242 | this.cdataEndTagRequired = false; |
| 243 | continue; |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | if (token.type == 'start-tag') { |
| 248 | if (token.value == 'script') { |
| 249 | // 1. Create an element for the token in the HTML namespace. |
| 250 | var el = new JSElement (this.doc, token.value); |
| 251 | if (token.attrs.async != null) el.async = true; |
| 252 | if (token.attrs.defer != null) el.defer = true; |
| 253 | if (token.attrs.src != null) el.src = token.attrs.src; |
| 254 | |
| 255 | // 2. Mark the element as being "parser-inserted". |
| 256 | el.manakaiParserInserted = true; |
| 257 | |
| 258 | // 3. Switch the tokeniser's content model flag to the CDATA state. |
| 259 | this.parseMode = 'cdata'; |
| 260 | this.endTagName = 'script'; |
| 261 | |
| 262 | // 4.1. Collect all the character tokens. |
| 263 | while (true) { |
| 264 | var token = this.getNextToken (); |
| 265 | log ('token: ' + token.type + ' "' + token.value + '"'); |
| 266 | |
| 267 | if (token.type == 'char') { |
| 268 | // 5. Append a single Text node to the script element node. |
| 269 | el.manakaiAppendText (token.value); |
| 270 | |
| 271 | // 4.2. Until it returns a token that is not a character token, or |
| 272 | // until it stops tokenising. |
| 273 | } else if (token.type == 'eof' || |
| 274 | token.type == 'end-tag' || |
| 275 | token.type == 'abort') { |
| 276 | // 6. Switched back to the PCDATA state. |
| 277 | this.parseMode = 'pcdata'; |
| 278 | |
| 279 | // 7.1. If the next token is not an end tag token with ... |
| 280 | if (!(token.type == 'end-tag' && token.value == 'script')) { |
| 281 | // 7.2. This is a parse error. |
| 282 | log ('Parse error: no </' + 'script>'); |
| 283 | this.nextToken.unshift (token); |
| 284 | |
| 285 | // 7.3. Mark the script element as "already executed". |
| 286 | el.manakaiAlreadyExecuted = true; |
| 287 | } else { |
| 288 | // 7.4. Ignore it. |
| 289 | // |
| 290 | } |
| 291 | break; |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | // 8.1. If the parser were originally created for the ... |
| 296 | if (this.fragmentParsingMode) { |
| 297 | // 8.2. Mark the script element as "already executed" and ... |
| 298 | el.manakaiAlreadyExecuted = true; |
| 299 | continue; |
| 300 | } |
| 301 | |
| 302 | // 9.1. Let the old insertion point have the same value as the ... |
| 303 | var oldInsertionPoint = this.insertionPoint; |
| 304 | // 9.2. Let the insertion point be just before the next input ... |
| 305 | this.setInsertionPoint (0); |
| 306 | |
| 307 | // 10. Append the new element to the current node. |
| 308 | this.openElements[this.openElements.length - 1].appendChild (el); |
| 309 | |
| 310 | // 11. Let the insertion point have the value of the old ... |
| 311 | |
| 312 | oldInsertionPoint += this.insertionPoint; |
| 313 | this.setInsertionPoint (oldInsertionPoint); |
| 314 | |
| 315 | // 12. If there is a pending external script |
| 316 | while (this.pendingExternalScript) { |
| 317 | // 12.1. If the tree construction stage is being called reentrantly |
| 318 | if (this.reentrant) { |
| 319 | log ('parse: abort (reentrance)'); |
| 320 | logIndentLevel--; |
| 321 | return; |
| 322 | |
| 323 | // 12.2. Otherwise |
| 324 | } else { |
| 325 | // 1. |
| 326 | var script = this.pendingExternalScript; |
| 327 | this.pendingExternalScript = null; |
| 328 | |
| 329 | // 2. Pause until the script has completed loading. |
| 330 | // |
| 331 | |
| 332 | // 3. Let the insertion point to just before the next input char. |
| 333 | this.setInsertionPoint (0); |
| 334 | |
| 335 | // 4. Execute the script. |
| 336 | executeScript (this.doc, script); |
| 337 | |
| 338 | // 5. Let the insertion point be undefined again. |
| 339 | this.setInsertionPoint (undefined); |
| 340 | |
| 341 | // 6. If there is once again a script that will execute ... |
| 342 | // |
| 343 | } |
| 344 | } |
| 345 | } else if (token.value == 'style' || |
| 346 | token.value == 'noscript' || |
| 347 | token.value == 'xmp') { |
| 348 | // 1. Create an element for the token in the HTML namespace. |
| 349 | var el = new JSElement (this.doc, token.value); |
| 350 | |
| 351 | // 2. Append the new element to the current node. |
| 352 | this.openElements[this.openElements.length - 1].appendChild (el); |
| 353 | |
| 354 | // 3. Switch the tokeniser's content model flag to the CDATA state. |
| 355 | this.parseMode = 'cdata'; |
| 356 | this.endTagName = token.value; |
| 357 | |
| 358 | // 4.1. Collect all the character tokens. |
| 359 | while (true) { |
| 360 | var token = this.getNextToken (); |
| 361 | log ('token: ' + token.type + ' "' + token.value + '"'); |
| 362 | |
| 363 | if (token.type == 'char') { |
| 364 | // 5. Append a single Text node to the script element node. |
| 365 | el.manakaiAppendText (token.value); |
| 366 | |
| 367 | // 4.2. Until it returns a token that is not a character token, or |
| 368 | // until it stops tokenising. |
| 369 | } else if (token.type == 'eof' || |
| 370 | token.type == 'end-tag' || |
| 371 | token.type == 'abort') { |
| 372 | // 6. Switched back to the PCDATA state. |
| 373 | this.parseMode = 'pcdata'; |
| 374 | |
| 375 | if (token.type == 'abort') { |
| 376 | this.cdataEndTagRequired = true; |
| 377 | break; |
| 378 | } |
| 379 | |
| 380 | // 7.1. If the next token is not an end tag token with ... |
| 381 | if (!(token.type == 'end-tag' && |
| 382 | token.value == this.endTagName)) { |
| 383 | // 7.2. This is a parse error. |
| 384 | log ('Parse error: no </' + this.endTagName + '>'); |
| 385 | this.nextToken.unshift (token); |
| 386 | |
| 387 | // 7.3. Mark the script element as "already executed". |
| 388 | el.manakaiAlreadyExecuted = true; |
| 389 | } else { |
| 390 | // 7.4. Ignore it. |
| 391 | // |
| 392 | } |
| 393 | break; |
| 394 | } |
| 395 | } |
| 396 | } else { |
| 397 | var el = new JSElement (this.doc, token.value); |
| 398 | this.openElements[this.openElements.length - 1].appendChild (el); |
| 399 | this.openElements.push (el); |
| 400 | } |
| 401 | } else if (token.type == 'end-tag') { |
| 402 | if (this.openElements[this.openElements.length - 1].localName == |
| 403 | token.value) { |
| 404 | this.openElements.pop (); |
| 405 | } else { |
| 406 | log ('parse error: unmatched end tag: ' + token.value); |
| 407 | } |
| 408 | } else if (token.type == 'char') { |
| 409 | this.openElements[this.openElements.length - 1].manakaiAppendText |
| 410 | (token.value); |
| 411 | } else if (token.type == 'eof') { |
| 412 | break; |
| 413 | } else if (token.type == 'abort') { |
| 414 | log ('parse: abort'); |
| 415 | logIndentLevel--; |
| 416 | return; |
| 417 | } |
| 418 | } |
| 419 | |
| 420 | log ('stop parsing'); |
| 421 | |
| 422 | // readyState = 'interactive' |
| 423 | |
| 424 | // "When a script completes loading" rules start applying. |
| 425 | |
| 426 | while (this.scriptsExecutedSoon.length > 0 || |
| 427 | this.scriptsExecutedAsynchronously.length > 0) { |
| 428 | // Handle "list of scripts that will execute as soon as possible". |
| 429 | while (this.scriptsExecutedSoon.length > 0) { |
| 430 | var e = this.scriptsExecutedSoon.shift (); |
| 431 | |
| 432 | // If it has completed loading |
| 433 | log ('Execute an external script not inserted by parser...'); |
| 434 | executeScript (this.doc, e); |
| 435 | |
| 436 | // NOTE: It MAY be executed before the end of the parsing, according |
| 437 | // to the spec. |
| 438 | this.hasAsyncScript = true; |
| 439 | } |
| 440 | |
| 441 | // Handle "list of scripts that will execute asynchronously". |
| 442 | while (this.scriptsExecutedAsynchronously.length > 0) { |
| 443 | var e = this.scriptsExecutedAsynchronously.shift (); |
| 444 | |
| 445 | // Step 1. |
| 446 | // We assume that all scripts have been loaded at this time. |
| 447 | |
| 448 | // Step 2. |
| 449 | log ('Execute an asynchronous script...'); |
| 450 | executeScript (this.doc, e); |
| 451 | |
| 452 | // Step 3. |
| 453 | // |
| 454 | |
| 455 | // Step 4. |
| 456 | // |
| 457 | |
| 458 | this.hasAsyncScript = true; |
| 459 | } |
| 460 | } |
| 461 | |
| 462 | // Handle "list of scripts that will execute when the document has finished |
| 463 | // parsing". |
| 464 | var list = this.scriptsExecutedAfterParsing; |
| 465 | while (list.length > 0) { |
| 466 | // TODO: break unless completed loading |
| 467 | |
| 468 | // Step 1. |
| 469 | // |
| 470 | |
| 471 | // Step 2. and Step 3. |
| 472 | log ('Executing a |defer|red script...'); |
| 473 | executeScript (this.doc, list.shift ()); |
| 474 | |
| 475 | // Step 4. |
| 476 | } |
| 477 | |
| 478 | log ('DOMContentLoaded event fired'); |
| 479 | |
| 480 | // "delays the load event" things has completed: |
| 481 | // readyState = 'complete' |
| 482 | log ('load event fired'); |
| 483 | |
| 484 | logIndentLevel--; |
| 485 | } // parse |
| 486 | |
| 487 | Parser.prototype.setInsertionPoint = function (ip) { |
| 488 | if (ip == undefined || ip == null || isNaN (ip)) { |
| 489 | log ('insertion point: set to undefined'); |
| 490 | this.insertionPoint = undefined; |
| 491 | } else if (ip == this.input.s.length) { |
| 492 | log ('insertion point: end of file'); |
| 493 | this.insertionPoint = ip; |
| 494 | } else { |
| 495 | log ('insertion point: set to ' + ip + |
| 496 | ' (before "' + this.input.s.substring (0, 10) + '")'); |
| 497 | this.insertionPoint = ip; |
| 498 | } |
| 499 | }; // setInsertionPoint |
| 500 | |
| 501 | function JSDocument (p) { |
| 502 | this.childNodes = []; |
| 503 | this._parser = p; |
| 504 | } // JSDocument |
| 505 | |
| 506 | function JSElement (doc, localName) { |
| 507 | this.localName = localName; |
| 508 | this.ownerDocument = doc; |
| 509 | this.childNodes = []; |
| 510 | } // JSElement |
| 511 | |
| 512 | JSDocument.prototype.appendChild = JSElement.prototype.appendChild = |
| 513 | function (e) { |
| 514 | this.childNodes.push (e); |
| 515 | e.parentNode = this; |
| 516 | |
| 517 | if (e.localName == 'script') { |
| 518 | logIndentLevel++; |
| 519 | log ('Running a script: start'); |
| 520 | |
| 521 | var doc = this.ownerDocument || this; |
| 522 | var p = doc._parser; |
| 523 | |
| 524 | // 1.The script's type |
| 525 | // |
| 526 | |
| 527 | // 2. The cript's character encoding |
| 528 | // |
| 529 | |
| 530 | // 3.1. If without script |
| 531 | // |
| 532 | // 2.2. If the script element was created by an XML ... innerHTML ... |
| 533 | // |
| 534 | // 2.3. If the user agent does not support the scripting language ... |
| 535 | // |
| 536 | if (false) { |
| 537 | // 2.5. Abort these steps at this point. |
| 538 | log ('Running a script: aborted (noscript)'); |
| 539 | logIndentLevel--; |
| 540 | return e; |
| 541 | } |
| 542 | |
| 543 | // 4. Set the element's "already executed" flag. |
| 544 | e.manakaiAlreadyExecuted = true; |
| 545 | |
| 546 | // 5. If the element has a src attribute, then a load for ... |
| 547 | // TODO: load an external resource |
| 548 | |
| 549 | // 5. The first of the following options: |
| 550 | |
| 551 | if (/* TODO: If the document is still being parsed && */ |
| 552 | e.defer && !e.async) { |
| 553 | // 6.1. |
| 554 | p.scriptsExecutedAfterParsing.push (e); |
| 555 | log ('Running a script: aborted (defer)'); |
| 556 | } else if (e.async && e.src != null) { |
| 557 | // 6.2. |
| 558 | p.scriptsExecutedAsynchronously.push (e); |
| 559 | log ('Running a script: aborted (async src)'); |
| 560 | } else if (e.async && e.src == null && |
| 561 | p.scriptsExecutedAsynchronously.length > 0) { |
| 562 | // 6.3. |
| 563 | p.scriptsExecutedAsynchronously.push (e); |
| 564 | log ('Running a script: aborted (async)'); |
| 565 | } else if (e.src != null && e.manakaiParserInserted) { |
| 566 | // 6.4. |
| 567 | if (p.pendingExternalScript) { |
| 568 | log ('Error: There is a pending external script.'); |
| 569 | } |
| 570 | p.pendingExternalScript = e; |
| 571 | log ('Running a script: aborted (src parser-inserted)'); |
| 572 | } else if (e.src != null) { |
| 573 | // 6.5. |
| 574 | p.scriptsExecutedSoon.push (e); |
| 575 | log ('Running a script: aborted (src)'); |
| 576 | } else { |
| 577 | // 6.6. |
| 578 | executeScript (doc, e); // even if other scripts are already executing. |
| 579 | } |
| 580 | |
| 581 | log ('Running a script: end'); |
| 582 | logIndentLevel--; |
| 583 | } |
| 584 | |
| 585 | return e; |
| 586 | }; // appendChild |
| 587 | |
| 588 | function executeScript (doc, e) { |
| 589 | log ('executing a script block: start'); |
| 590 | |
| 591 | var s; |
| 592 | if (e.src != null) { |
| 593 | s = getExternalScript (e.src); |
| 594 | |
| 595 | // If the load resulted in an error, then ... firing an error event ... |
| 596 | if (s == null) { |
| 59 |