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Patch
| revision 1.1 by wakaba, Sun Apr 20 06:07:24 2008 UTC | revision 1.20 by wakaba, Sat Sep 20 13:32:45 2008 UTC | |
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| # | Line 1 | Line 1 |
| 1 | <!DOCTYPE HTML> | <!DOCTYPE HTML> |
| 2 | <html lang=en> | <html lang=en> |
| 3 | <head> | <head> |
| 4 | <title>Demo of HTML5 Parsing Algorithm with Scripting Enabled</title> | <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> | <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 { | textarea { |
| 21 | display: block; | width: 100%; |
| 22 | width: 80%; | -width: 99%; |
| 23 | margin-left: auto; | height: 10em; |
| margin-right: auto; | ||
| min-height: 20em; | ||
| 24 | } | } |
| 25 | output { | output { |
| 26 | display: block; | display: block; |
| 27 | font-family: monospace; | font-family: monospace; |
| 28 | white-space: pre; | white-space: -moz-pre-wrap; |
| 29 | white-space: pre-wrap; | |
| 30 | } | } |
| 31 | </style> | </style> |
| 32 | <script> | <script> |
| 33 | var delayedUpdater = 0; | |
| 34 | ||
| 35 | function update () { | function update () { |
| 36 | document.logElement.textContent = ''; | if (delayedUpdater) { |
| 37 | var p = new Parser (); | clearTimeout (delayedUpdater); |
| 38 | p.parse (new InputStream (document.sourceElement.value)); | delayedUpdater = 0; |
| 39 | log (dumpTree (p.doc, '')); | } |
| 40 | delayedUpdater = setTimeout (update2, 100); | |
| 41 | } // update | } // 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) { | 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")); | document.logElement.appendChild (document.createTextNode (s + "\n")); |
| 74 | } // log | } // log |
| 75 | ||
| # | Line 32 | Line 77 |
| 77 | this.s = s; | this.s = s; |
| 78 | } // InputStream | } // InputStream |
| 79 | ||
| 80 | function Parser () { | function Parser (i, doc) { |
| 81 | this.parseMode = 'pcdata'; | this.parseMode = 'pcdata'; |
| 82 | this.doc = new JSDocument (); | if (!doc) { |
| 83 | this.openElements = [this.doc]; | 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 | } // Parser |
| 94 | ||
| 95 | Parser.prototype.getNextToken = function (i) { | Parser.prototype.getNextToken = function () { |
| 96 | if (this.parseMode == 'script') { | 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; | var token; |
| 105 | i.s = i.s.replace (/^([\s\S]+?)<\/[Ss][Cc][Rr][Ii][Pp][Tt]>/, | if (p.insertionPoint <= 0) { |
| 106 | return {type: 'abort'}; | |
| 107 | } | |
| 108 | i.s = i.s.replace (/^([^<]+)/, | |
| 109 | function (s, t) { | 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}; | token = {type: 'char', value: t}; |
| 117 | return '<' + '/script>'; | 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; | if (token) return token; |
| 132 | i.s = i.s.replace (/^<\/[Ss][Cc][Rr][Ii][Pp][Tt]>/, function () { | var m; |
| 133 | token = {type: 'end-tag', value: 'script'}; | 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 ''; | return ''; |
| 145 | }); | }); |
| 146 | if (token) return token; | if (token) return token; |
| # | Line 56 | Line 148 |
| 148 | } | } |
| 149 | ||
| 150 | var token; | var token; |
| 151 | i.s = i.s.replace (/^<\/([^>]+)>/, function (s, e) { | i.s = i.s.replace (/^<\/([^>]+)(?:>|$)/, function (s, e) { |
| 152 | if (p.insertionPoint < s.length || | |
| 153 | (p.insertionPoint <= s.length && | |
| 154 | s.substring (s.length - 1, s.length) != '>')) { | |
| 155 | token = {type: 'abort'}; | |
| 156 | return s; | |
| 157 | } | |
| 158 | token = {type: 'end-tag', value: e.toLowerCase ()}; | token = {type: 'end-tag', value: e.toLowerCase ()}; |
| 159 | p.insertionPoint -= s.length; | |
| 160 | return ''; | return ''; |
| 161 | }); | }); |
| 162 | if (token) return token; | if (token) return token; |
| 163 | i.s = i.s.replace (/^<([^>]+)>/, function (s, e) { | i.s = i.s.replace (/^<([^>]+)(?:>|$)/, function (s, e) { |
| 164 | token = {type: 'start-tag', value: e.toLowerCase ()}; | 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 ''; | return ''; |
| 195 | }); | }); |
| 196 | if (token) return token; | if (token) return token; |
| 197 | if (p.insertionPoint <= 0) { | |
| 198 | return {type: 'abort'}; | |
| 199 | } | |
| 200 | i.s = i.s.replace (/^[^<]+/, function (s) { | 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}; | token = {type: 'char', value: s}; |
| 208 | p.insertionPoint -= s.length; | |
| 209 | return ''; | return ''; |
| 210 | }); | }); |
| 211 | if (token) return token; | if (token) return token; |
| 212 | i.s = i.s.replace (/^[\s\S]/, function (s) { | i.s = i.s.replace (/^[\s\S]/, function (s) { |
| 213 | token = {type: 'char', value: s}; | token = {type: 'char', value: s}; |
| 214 | p.insertionPoint -= s.length; | |
| 215 | return ''; | return ''; |
| 216 | }); | }); |
| 217 | if (token) return token; | if (token) return token; |
| 218 | return {type: 'eof'}; | return {type: 'eof'}; |
| 219 | } // getNextToken | } // getNextToken |
| 220 | ||
| 221 | Parser.prototype.parse = function (i) { | Parser.prototype.parse = function () { |
| 222 | log ('start parsing'); | logIndentLevel++; |
| 223 | log ('parse: start'); | |
| 224 | ||
| 225 | while (true) { | while (true) { |
| 226 | var token = this.getNextToken (i); | var token = this.getNextToken (); |
| 227 | log ('token: ' + token.type + ' "' + token.value + '"'); | 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') { | if (token.type == 'start-tag') { |
| var el = new JSElement (token.value); | ||
| 248 | if (token.value == 'script') { | if (token.value == 'script') { |
| 249 | this.parseMode = 'script'; | // 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) { | while (true) { |
| 264 | var token = this.getNextToken (i); | var token = this.getNextToken (); |
| 265 | log ('token: ' + token.type + ' "' + token.value + '"'); | log ('token: ' + token.type + ' "' + token.value + '"'); |
| 266 | ||
| 267 | if (token.type == 'char') { | if (token.type == 'char') { |
| 268 | // 5. Append a single Text node to the script element node. | |
| 269 | el.manakaiAppendText (token.value); | 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' || | } else if (token.type == 'eof' || |
| 274 | (token.type == 'end-tag' && token.value == 'script')) { | token.type == 'end-tag' || |
| 275 | token.type == 'abort') { | |
| 276 | // 6. Switched back to the PCDATA state. | |
| 277 | this.parseMode = 'pcdata'; | 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; | 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); | 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 { | } else { |
| 397 | var el = new JSElement (this.doc, token.value); | |
| 398 | this.openElements[this.openElements.length - 1].appendChild (el); | this.openElements[this.openElements.length - 1].appendChild (el); |
| 399 | this.openElements.push (el); | this.openElements.push (el); |
| 400 | } | } |
| # | Line 116 | Line 405 |
| 405 | } else { | } else { |
| 406 | log ('parse error: unmatched end tag: ' + token.value); | 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') { | } else if (token.type == 'eof') { |
| 412 | break; | break; |
| 413 | } else if (token.type == 'abort') { | |
| 414 | log ('parse: abort'); | |
| 415 | logIndentLevel--; | |
| 416 | return; | |
| 417 | } | } |
| 418 | } | } |
| 419 | ||
| 420 | log ('stop parsing'); | 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 | } // parse |
| 486 | ||
| 487 | function JSDocument () { | 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 = []; | this.childNodes = []; |
| 503 | this._parser = p; | |
| 504 | } // JSDocument | } // JSDocument |
| 505 | ||
| 506 | function JSElement (localName) { | function JSElement (doc, localName) { |
| 507 | this.localName = localName; | this.localName = localName; |
| 508 | this.ownerDocument = doc; | |
| 509 | this.childNodes = []; | this.childNodes = []; |
| 510 | } // JSElement | } // JSElement |
| 511 | ||
| # | Line 137 | Line 513 |
| 513 | function (e) { | function (e) { |
| 514 | this.childNodes.push (e); | this.childNodes.push (e); |
| 515 | e.parentNode = this; | 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; | return e; |
| 586 | }; // appendChild | }; // 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) { | |
| 597 | log ('error event fired at the script element'); | |
| 598 | return; | |
| 599 | } | |
| 600 | ||
| 601 | log ('External script loaded: "' + s + '"'); | |
| 602 | } else { | |
| 603 | s = e.text; | |
| 604 | } | |
| 605 | ||
| 606 | // If the load was successful | |
| 607 | ||
| 608 | if (true) { | |
| 609 | // Scripting is enabled, Document.designMode is disabled, | |
| 610 | // Document is the active document in its browsing context | |
| 611 | ||
| 612 | parseAndRunScript (doc, s); | |
| 613 | } | |
| 614 | ||
| 615 | log ('load event fired at the script element'); | |
| 616 | ||
| 617 | log ('executing a script block: end'); | |
| 618 | } // executeScript | |
| 619 | ||
| 620 | function getExternalScript (uri) { | |
| 621 | if (uri.match (/^javascript:/i)) { | |
| 622 | var m; | |
| 623 | if (m = uri.match (/^javascript:\s*(?:'([^']*)'|"([^"]+)")\s*$/i)) { | |
| 624 | if (m[1]) { | |
| 625 | return unescapeJSLiteral (m[1]); | |
| 626 | } else if (m[2]) { | |
| 627 | return unescapeJSLiteral (m[2]); | |
| 628 | } else { | |
| 629 | return null; | |
| 630 | } | |
| 631 | } else { | |
| 632 | log ('Complex javascript: URI is not supported: <' + uri + '>'); | |
| 633 | return null; | |
| 634 | } | |
| 635 | } else { | |
| 636 | log ('URI scheme not supported: <' + uri + '>'); | |
| 637 | return null; | |
| 638 | } | |
| 639 | } // getExternalScript | |
| 640 | ||
| 641 | function parseAndRunScript (doc, s) { | |
| 642 | while (true) { | |
| 643 | var matched = false; | |
| 644 | s = s.replace (/^\s*document\.write\s*\(((?:'[^']*'|"[^"]*")\s*(?:,\s*(?:'[^']*'|"[^"]*"))*)\)\s*;\s*/, function (s, t) { | |
| 645 | matched = true; | |
| 646 | var args = []; | |
| 647 | t.replace (/('[^']*'|"[^"]*")/g, function (s, v) { | |
| 648 | args.push (unescapeJSLiteral (v.substring (1, v.length - 1))); | |
| 649 | return ''; | |
| 650 | }); | |
| 651 | doc.write.apply (doc, args); | |
| 652 | return ''; | |
| 653 | }); | |
| 654 | var noDocumentElement = false; | |
| 655 | s = s.replace (/^\s*var\s+s\s*=\s*document\.createElement\s*\(\s*['"]script['"]\s*\)\s*;\s*s\.src\s*=\s*(?:'([^']*)'|"([^"]*)")\s*;\s*document\.documentElement\.appendChild\s*\(\s*s\s*\)\s*;\s*/, | |
| 656 | function (s, t, u) { | |
| 657 | matched = true; | |
| 658 | var args = [unescapeJSLiteral (t ? t : u)]; | |
| 659 | noDocumentElement = !doc._insertExternalScript.apply (doc, args); | |
| 660 | return ''; | |
| 661 | }); | |
| 662 | if (noDocumentElement) { | |
| 663 | log ('Script error: documentElement is null'); | |
| 664 | break; | |
| 665 | } | |
| 666 | s = s.replace (/^\s*w\s*\(\s*document\.documentElement\.innerHTML\s*\)\s*;\s*/, | |
| 667 | function (s, t) { | |
| 668 | matched = true; | |
| 669 | log (dumpTree (doc, '')); | |
| 670 | return ''; | |
| 671 | }); | |
| 672 | if (s == '') break; | |
| 673 | if (!matched) { | |
| 674 | log ('Script parse error: "' + s + '"'); | |
| 675 | break; | |
| 676 | } | |
| 677 | } | |
| 678 | } // parseAndRunScript | |
| 679 | ||
| 680 | function unescapeJSLiteral (s) { | |
| 681 | return s.replace (/\\u([0-9A-Fa-f]{4})/g, function (t, v) { | |
| 682 | return String.fromCharCode (parseInt ('0x' + v)); | |
| 683 | }); | |
| 684 | } // unescapeJSLiteral | |
| 685 | ||
| 686 | function JSText (data) { | function JSText (data) { |
| 687 | this.data = data; | this.data = data; |
| 688 | } // JSText | } // JSText |
| # | Line 155 | Line 698 |
| 698 | } | } |
| 699 | }; // manakaiAppendText | }; // manakaiAppendText |
| 700 | ||
| 701 | JSDocument.prototype.open = function () { | |
| 702 | // Two or fewer arguments | |
| 703 | ||
| 704 | // Step 1. | |
| 705 | var type = arguments[0] || 'text/html'; | |
| 706 | ||
| 707 | // Step 2. | |
| 708 | var replace = arguments[1] == 'replace'; | |
| 709 | ||
| 710 | // Step 3. | |
| 711 | if (this._parser && | |
| 712 | !this._parser.scriptCreated && | |
| 713 | this._parser.input.insertionPoint != undefined) { | |
| 714 | log ('document.open () in parsing mode is ignored'); | |
| 715 | return this; | |
| 716 | } | |
| 717 | ||
| 718 | // Step 4. | |
| 719 | log ('onbeforeunload event fired'); | |
| 720 | log ('onunload event fired'); | |
| 721 | ||
| 722 | // Step 5. | |
| 723 | if (this._parser) { | |
| 724 | // Discard the parser. | |
| 725 | } | |
| 726 | ||
| 727 | // Step 6. | |
| 728 | log ('document cleared by document.open ()'); | |
| 729 | this.childNodes = []; | |
| 730 | ||
| 731 | // Step 7. | |
| 732 | this._parser = new Parser (new InputStream (''), this); | |
| 733 | this._parser.scriptCreated = true; | |
| 734 | ||
| 735 | // Step 8. | |
| 736 | this.manakaiIsHTML = true; | |
| 737 | ||
| 738 | // Step 9. | |
| 739 | // If not text/html, ... | |
| 740 | ||
| 741 | // Step 10. | |
| 742 | if (!replace) { | |
| 743 | // History | |
| 744 | } | |
| 745 | ||
| 746 | // Step 11. | |
| 747 | this._parser.setInsertionPoint (this._parser.input.s.length); | |
| 748 | ||
| 749 | // Step 12. | |
| 750 | return this; | |
| 751 | }; // document.open | |
| 752 | ||
| 753 | JSDocument.prototype.write = function () { | |
| 754 | log ('document.write: start'); | |
| 755 | logIndentLevel++; | |
| 756 | ||
| 757 | var p = this._parser; | |
| 758 | ||
| 759 | // 1. If the insertion point is undefined, the open() method must be ... | |
| 760 | if (isNaN (p.insertionPoint) || p.insertionPoint == undefined) { | |
| 761 | this.open (); | |
| 762 | p = this._parser; | |
| 763 | } | |
| 764 | ||
| 765 | // 2. ... inserted into the input stream just before the insertion point. | |
| 766 | var s = Array.join (arguments, ''); | |
| 767 | log ('document.write: insert "' + s + '"' + | |
| 768 | ' before "' + | |
| 769 | p.input.s.substring (p.insertionPoint, p.insertionPoint + 10) + '"'); | |
| 770 | p.input.s = p.input.s.substring (0, p.insertionPoint) + s | |
| 771 | + p.input.s.substring (p.insertionPoint, p.input.s.length); | |
| 772 | p.insertionPoint += s.length; | |
| 773 | ||
| 774 | // 3. If there is a pending external script | |
| 775 | if (p.pendingExternalScript) { | |
| 776 | log ('document.write: processed later (there is an unprocessed <script src>)'); | |
| 777 | logIndentLevel--; | |
| 778 | log ('document.write: return'); | |
| 779 | return; | |
| 780 | } | |
| 781 | ||
| 782 | // 4. Process the characters that were inserted, ... | |
| 783 | var originalReentrant = p.reentrant; | |
| 784 | p.reentrant = true; | |
| 785 | p.parse (); | |
| 786 | p.reentrant = originalReentrant; | |
| 787 | // TODO: "Abort the processing of any nested invokations of the tokeniser, | |
| 788 | // yielding control back to the caller." (<script> parsing). Do we need | |
| 789 | // to do something here? | |
| 790 | ||
| 791 | // 5. Return | |
| 792 | logIndentLevel--; | |
| 793 | log ('document.write: return'); | |
| 794 | ||
| 795 | return; | |
| 796 | }; // document.write | |
| 797 | ||
| 798 | JSDocument.prototype._insertExternalScript = function (uri) { | |
| 799 | var s = new JSElement (this, 'script'); | |
| 800 | s.src = uri; | |
| 801 | if (this.documentElement) { | |
| 802 | this.documentElement.appendChild (s); | |
| 803 | return true; | |
| 804 | } else { | |
| 805 | return false; | |
| 806 | } | |
| 807 | }; // _insertExternalScript | |
| 808 | ||
| 809 | JSDocument.prototype.__defineGetter__ ('documentElement', function () { | |
| 810 | var cn = this.childNodes; | |
| 811 | for (var i = 0; i < cn.length; i++) { | |
| 812 | if (cn[i] instanceof JSElement) { | |
| 813 | return cn[i] | |
| 814 | } | |
| 815 | } | |
| 816 | return null; | |
| 817 | }); | |
| 818 | ||
| 819 | JSElement.prototype.__defineGetter__ ('text', function () { | |
| 820 | var r = ''; | |
| 821 | for (var i = 0; i < this.childNodes.length; i++) { | |
| 822 | if (this.childNodes[i] instanceof JSText) { | |
| 823 | r += this.childNodes[i].data; | |
| 824 | } | |
| 825 | } | |
| 826 | return r; | |
| 827 | }); | |
| 828 | ||
| 829 | function dumpTree (n, indent) { | function dumpTree (n, indent) { |
| 830 | var r = ''; | var r = ''; |
| 831 | for (var i = 0; i < n.childNodes.length; i++) { | for (var i = 0; i < n.childNodes.length; i++) { |
| 832 | var node = n.childNodes[i]; | var node = n.childNodes[i]; |
| 833 | if (node instanceof JSElement) { | if (node instanceof JSElement) { |
| 834 | r += '| ' + indent + node.localName + '\n'; | r += '| ' + indent + node.localName + '\n'; |
| 835 | if (node.async) r += '| ' + indent + ' async=""\n'; | |
| 836 | if (node.defer) r += '| ' + indent + ' defer=""\n'; | |
| 837 | if (node.src != null) { | |
| 838 | r += '| ' + indent + ' src="' + node.src + '"\n'; | |
| 839 | } | |
| 840 | r += dumpTree (node, indent + ' '); | r += dumpTree (node, indent + ' '); |
| 841 | } else if (node instanceof JSText) { | } else if (node instanceof JSText) { |
| 842 | r += '| ' + indent + '"' + node.data + '"\n'; | r += '| ' + indent + '"' + node.data + '"\n'; |
| # | Line 174 | Line 850 |
| 850 | </head> | </head> |
| 851 | <body onload=" | <body onload=" |
| 852 | document.sourceElement = document.getElementsByTagName ('textarea')[0]; | document.sourceElement = document.getElementsByTagName ('textarea')[0]; |
| 853 | ||
| 854 | var q = location.search; | |
| 855 | if (q != null) { | |
| 856 | q = q.substring (1).split (/;/); | |
| 857 | for (var i = 0; i < q.length; i++) { | |
| 858 | var v = q[i].split (/=/, 2); | |
| 859 | v[0] = decodeURIComponent (v[0]); | |
| 860 | v[1] = decodeURIComponent (v[1] || ''); | |
| 861 | if (v[0] == 's') { | |
| 862 | document.sourceElement.value = v[1]; | |
| 863 | } | |
| 864 | } | |
| 865 | } | |
| 866 | ||
| 867 | document.logElement = document.getElementsByTagName ('output')[0]; | document.logElement = document.getElementsByTagName ('output')[0]; |
| 868 | update (); | update (); |
| 869 | "> | "> |
| 870 | <h1>Live Scripting <abbr title="Hypertext Markup Language">HTML</abbr> | |
| 871 | Parser</h1> | |
| 872 | ||
| 873 | <textarea onchange=" update () "><html> | <h2>Markup to test |
| 874 | (<a href=data:, id=permalink rel=bookmark>permalink</a>, | |
| 875 | <a href="http://software.hixie.ch/utilities/js/live-dom-viewer/" | |
| 876 | id=ldvlink>Live <abbr title="Document Object Model">DOM</abbr> | |
| 877 | Viewer</a>)</h2> | |
| 878 | <p> | |
| 879 | <textarea onkeydown=" update () " onchange=" update () " oninput=" update () "><html> | |
| 880 | <head></head><body> | <head></head><body> |
| 881 | <p> | <p> |
| 882 | <script> | <script> |
| 883 | document.write ('aaaaaaa</p>\n<script>\ndocument.write("cccccc")\n</', 'script>\nbbbbbb'); | document.write ('aaaaaaa</p><script>document.write("cccccc");</', 'script>bbbbbb'); |
| 884 | </script> | </script> |
| 885 | <p> | <p> |
| 886 | </textarea> |