/[suikacvs]/markup/html/scripting-parser/parser.html
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revision 1.2 by wakaba, Sun Apr 20 07:48:00 2008 UTC revision 1.9 by wakaba, Sun Apr 27 09:16:11 2008 UTC
# 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  <style>  <style>
6      h1, h2 {
7        margin: 0;
8        font-size: 100%;
9      }
10      p, pre {
11        margin: 0;
12      }
13    textarea {    textarea {
14       display: block;      width: 100%;
15       width: 80%;      -width: 99%;
16       margin-left: auto;      height: 10em;
      margin-right: auto;  
      min-height: 20em;  
17    }    }
18    output {    output {
19      display: block;      display: block;
20      font-family: monospace;      font-family: monospace;
21      white-space: pre;      white-space: -moz-pre-wrap;
22        white-space: pre-wrap;
23    }    }
24  </style>  </style>
25  <script>  <script>
26      var delayedUpdater = 0;
27    
28    function update () {    function update () {
29      document.logElement.textContent = '';      if (delayedUpdater) {
30      var p = new Parser (new InputStream (document.sourceElement.value));        clearTimeout (delayedUpdater);
31      p.parse ();        delayedUpdater = 0;
32      log (dumpTree (p.doc, ''));      }
33        delayedUpdater = setTimeout (update2, 100);
34    } // update    } // update
35    
36      function update2 () {
37        var v = document.sourceElement.value;
38        if (v != document.previousSourceText) {
39          document.previousSourceText = v;
40          document.links['permalink'].href
41              = location.pathname + '?s=' + encodeURIComponent (v);
42          document.links['ldvlink'].href
43              = 'http://software.hixie.ch/utilities/js/live-dom-viewer/?'
44              + encodeURIComponent (v);
45    
46          document.logElement.textContent = '';
47          var p = new Parser (new InputStream (v));
48          var doc = p.doc;
49          p.parse ();
50          log (dumpTree (doc, ''));
51        }
52      } // update2
53    
54      var logIndentLevel = 0;
55    function log (s) {    function log (s) {
56        for (var i = 0; i < logIndentLevel; i++) {
57          s = '  ' + s;
58        }
59      document.logElement.appendChild (document.createTextNode (s + "\n"));      document.logElement.appendChild (document.createTextNode (s + "\n"));
60    } // log    } // log
61    
# Line 32  Line 63 
63      this.s = s;      this.s = s;
64    } // InputStream    } // InputStream
65    
66    function Parser (i) {    function Parser (i, doc) {
67      this.parseMode = 'pcdata';      this.parseMode = 'pcdata';
68      this.doc = new JSDocument (this);      if (!doc) {
69      this.openElements = [this.doc];        doc = new JSDocument (this);
70      this.in = i;        doc.manakaiIsHTML = true;
71        }
72        this.doc = doc;
73        this.openElements = [doc];
74        this.input = i;
75        this.scriptsExecutedAfterParsing = [];
76    } // Parser    } // Parser
77    
78    Parser.prototype.getNextToken = function () {    Parser.prototype.getNextToken = function () {
79      var i = this.in;      var p = this;
80        var i = this.input;
81      if (this.parseMode == 'script') {      if (this.parseMode == 'script') {
82        var token;        var token;
83        i.s = i.s.replace (/^([\s\S]+?)<\/[Ss][Cc][Rr][Ii][Pp][Tt]>/,        if (p.insertionPoint <= 0) {
84            return {type: 'abort'};
85          }
86          i.s = i.s.replace (/^([^<]+)/,
87        function (s, t) {        function (s, t) {
88            if (0 < p.insertionPoint && p.insertionPoint < t.length) {
89              token = {type: 'char', value: t.substring (0, p.insertionPoint)};
90              var ip = p.insertionPoint;
91              p.insertionPoint = 0;
92              return t.substring (ip, t.length);
93            }
94          token = {type: 'char', value: t};          token = {type: 'char', value: t};
95          return '<' + '/script>';          p.insertionPoint -= t.length;
96            return '';
97        });        });
98        if (token) return token;        if (token) return token;
99        i.s = i.s.replace (/^<\/[Ss][Cc][Rr][Ii][Pp][Tt]>/, function () {        i.s = i.s.replace (/^<\/[Ss][Cc][Rr][Ii][Pp][Tt]>/, function (s) {
100            if (p.insertionPoint < s.length) {
101              token = {type: 'abort'};
102              return s;
103            }
104          token = {type: 'end-tag', value: 'script'};          token = {type: 'end-tag', value: 'script'};
105            p.insertionPoint -= s.length;
106            return '';
107          });
108          if (token) return token;
109          var m;
110          if ((p.insertionPoint < '</script'.length) &&
111              (m = i.s.match (/^<\/([SCRIPTscript]+)/))) {
112            var v = m[1].substring (0, p.insertionPoint).toLowerCase ();
113            if (v == 'script'.substring (0, p.insertionPoint - '</'.length)) {
114              return {type: 'abort'};
115            }
116          }
117          i.s = i.s.replace (/^</,
118          function (s) {
119            token = {type: 'char', value: s};
120            p.insertionPoint -= s.length;
121          return '';          return '';
122        });        });
123        if (token) return token;        if (token) return token;
# Line 58  Line 125 
125      }      }
126    
127      var token;      var token;
128      i.s = i.s.replace (/^<\/([^>]+)>/, function (s, e) {      i.s = i.s.replace (/^<\/([^>]+)(?:>|$)/, function (s, e) {
129          if (p.insertionPoint < s.length ||
130              (p.insertionPoint <= s.length &&
131               s.substring (s.length - 1, 1) != '>')) {
132            token = {type: 'abort'};
133            return s;
134          }
135        token = {type: 'end-tag', value: e.toLowerCase ()};        token = {type: 'end-tag', value: e.toLowerCase ()};
136          p.insertionPoint -= s.length;
137        return '';        return '';
138      });      });
139      if (token) return token;      if (token) return token;
140      i.s = i.s.replace (/^<([^>]+)>/, function (s, e) {      i.s = i.s.replace (/^<([^>]+)(?:>|$)/, function (s, e) {
141        token = {type: 'start-tag', value: e.toLowerCase ()};        if (p.insertionPoint < s.length ||
142              (p.insertionPoint <= s.length &&
143               s.substring (s.length - 1, 1) != '>')) {
144            token = {type: 'abort'};
145            return s;
146          }
147          var tagName;
148          var attrs = {};
149          e = e.replace (/^[\S]+/, function (v) {
150            tagName = v.toLowerCase ();
151            return '';
152          });
153          while (true) {
154            var m = false;
155            e = e.replace (/^\s*([^\s=]+)\s*(?:=\s*(?:"([^"]*)"|'([^']*)'|([^"'\s]*)))?/,
156            function (x, attrName, attrValue1, attrValue2, attrValue3) {
157              v = attrValue1 || attrValue2 || attrValue3;
158              v = v.replace (/&quot;/g, '"').replace (/&apos;/g, "'")
159                  .replace (/&amp;/g, '&');
160              attrs[attrName.toLowerCase ()] = v;
161              m = true;
162              return '';
163            });
164            if (!m) break;
165          }
166          if (e.length) {
167            log ('Broken start tag: "' + e + '"');
168          }
169          token = {type: 'start-tag', value: tagName, attrs: attrs};
170          p.insertionPoint -= s.length;
171        return '';        return '';
172      });      });
173      if (token) return token;      if (token) return token;
174        if (p.insertionPoint <= 0) {
175          return {type: 'abort'};
176        }
177      i.s = i.s.replace (/^[^<]+/, function (s) {      i.s = i.s.replace (/^[^<]+/, function (s) {
178          if (p.insertionPoint < s.length) {
179            token = {type: 'char', value: s.substring (0, p.insertionPoint)};
180            var ip = p.insertionPoint;
181            p.insertionPoint = 0;
182            return s.substring (ip, s.length);
183          }
184        token = {type: 'char', value: s};        token = {type: 'char', value: s};
185          p.insertionPoint -= s.length;
186        return '';        return '';
187      });      });
188      if (token) return token;      if (token) return token;
189      i.s = i.s.replace (/^[\s\S]/, function (s) {      i.s = i.s.replace (/^[\s\S]/, function (s) {
190        token = {type: 'char', value: s};        token = {type: 'char', value: s};
191          p.insertionPoint -= s.length;
192        return '';        return '';
193      });      });
194      if (token) return token;      if (token) return token;
# Line 82  Line 196 
196    } // getNextToken    } // getNextToken
197    
198    Parser.prototype.parse = function () {    Parser.prototype.parse = function () {
199      log ('start parsing');      logIndentLevel++;
200        log ('parse: start');
201    
202      while (true) {      while (true) {
203        var token = this.getNextToken ();        var token = this.getNextToken ();
# Line 92  Line 207 
207          if (token.value == 'script') {          if (token.value == 'script') {
208            // 1. Create an element for the token in the HTML namespace.            // 1. Create an element for the token in the HTML namespace.
209            var el = new JSElement (this.doc, token.value);            var el = new JSElement (this.doc, token.value);
210              if (token.attrs.async != null) el.async = true;
211              if (token.attrs.defer != null) el.defer = true;
212              if (token.attrs.src != null) el.src = token.attrs.src;
213    
214            // 2. Mark the element as being "parser-inserted".            // 2. Mark the element as being "parser-inserted".
215            el.manakaiParserInserted = true;            el.manakaiParserInserted = true;
# Line 109  Line 227 
227                el.manakaiAppendText (token.value);                el.manakaiAppendText (token.value);
228    
229              // 4.2. Until it returns a token that is not a character token, or              // 4.2. Until it returns a token that is not a character token, or
230              // TODO: 4.3. Until it stops tokenising.              // until it stops tokenising.
231              } else if (token.type == 'eof' ||              } else if (token.type == 'eof' ||
232                         (token.type == 'end-tag' && token.value == 'script')) {                         (token.type == 'end-tag' && token.value == 'script') ||
233                           token.type == 'abort') {
234                // 6. Switched back to the PCDATA state.                // 6. Switched back to the PCDATA state.
235                this.parseMode = 'pcdata';                this.parseMode = 'pcdata';
236    
# Line 138  Line 257 
257            }            }
258    
259            // 9.1. Let the old insertion point have the same value as the ...            // 9.1. Let the old insertion point have the same value as the ...
260              var oldInsertionPoint = this.insertionPoint;
261            // 9.2. Let the insertion point be just before the next input ...            // 9.2. Let the insertion point be just before the next input ...
262              this.setInsertionPoint (0);
263    
264            // 10. Append the new element to the current node.            // 10. Append the new element to the current node.
265            this.openElements[this.openElements.length - 1].appendChild (el);            this.openElements[this.openElements.length - 1].appendChild (el);
266    
267            // 11. Let the insertion point have the value of the old ...            // 11. Let the insertion point have the value of the old ...
268    
269              oldInsertionPoint += this.insertionPoint;
270              this.setInsertionPoint (oldInsertionPoint);
271    
272            // 12. If there is a script that will execute as soon as ...            // 12. If there is a script that will execute as soon as ...
273                        while (this.scriptExecutedWhenParserResumes) {
274                // 12.1. If the tree construction stage is being called reentrantly
275                if (this.reentrant) {
276                  log ('parse: abort (reentrance)');
277                  logIndentLevel--;
278                  return;
279    
280                // 12.2. Otherwise
281                } else {
282                  // 1.
283                  var script = this.scriptExecutedWhenParserResumes;
284                  this.scriptExecutedWhenParserResumes = null;
285    
286                  // 2. Pause until the script has completed loading.
287                  //
288    
289                  // 3. Let the insertion point to just before the next input char.
290                  this.setInsertionPoint (0);
291    
292                  // 4. Execute the script.
293                  executeScript (this.doc, script);
294    
295                  // 5. Let the insertion point be undefined again.
296                  this.setInsertionPoint (undefined);
297    
298                  // 6. If there is once again a script that will execute ...
299                  //
300                }
301              }
302          } else {          } else {
303            var el = new JSElement (this.doc, token.value);            var el = new JSElement (this.doc, token.value);
304            this.openElements[this.openElements.length - 1].appendChild (el);            this.openElements[this.openElements.length - 1].appendChild (el);
# Line 161  Line 311 
311          } else {          } else {
312            log ('parse error: unmatched end tag: ' + token.value);            log ('parse error: unmatched end tag: ' + token.value);
313          }          }
314          } else if (token.type == 'char') {
315            this.openElements[this.openElements.length - 1].manakaiAppendText
316                (token.value);
317        } else if (token.type == 'eof') {        } else if (token.type == 'eof') {
318          break;          break;
319          } else if (token.type == 'abort') {
320            log ('parse: abort');
321            logIndentLevel--;
322            return;
323        }        }
324      }      }
325    
326      log ('stop parsing');      log ('stop parsing');
327    
328        // readyState = 'interactive'
329    
330        // "When a script completes loading" rules start applying.
331    
332        // TODO: Handles "list of scripts that will execute as soon as possible"
333        // and "list of scripts that will execute asynchronously"
334    
335        // Handle "list of scripts that will execute when the document has finished
336        // parsing".
337        var list = this.scriptsExecutedAfterParsing;
338        while (list.length > 0) {
339          // TODO: break unless completed loading
340    
341          // Step 1.
342          //
343    
344          // Step 2. and Step 3.
345          log ('Executing a |defer|red script...');
346          executeScript (this.doc, list.shift ());
347    
348          // Step 4.
349        }
350    
351        log ('DOMContentLoaded event fired');
352    
353        // "delays tha load event" things has completed:
354        // readyState = 'complete'
355        log ('load event fired');
356    
357        logIndentLevel--;
358    } // parse    } // parse
359    
360      Parser.prototype.setInsertionPoint = function (ip) {
361        if (ip == undefined || ip == null || isNaN (ip)) {
362          log ('insertion point: set to undefined');
363          this.insertionPoint = undefined;
364        } else if (ip == this.input.s.length) {
365          log ('insertion point: end of file');
366          this.insertionPoint = ip;
367        } else {
368          log ('insertion point: set to ' + ip +
369               ' (before "' + this.input.s.substring (0, 10) + '")');
370          this.insertionPoint = ip;
371        }
372      }; // setInsertionPoint
373    
374    function JSDocument (p) {    function JSDocument (p) {
375      this.childNodes = [];      this.childNodes = [];
376      this._parser = p;      this._parser = p;
# Line 186  Line 388 
388      e.parentNode = this;      e.parentNode = this;
389    
390      if (e.localName == 'script') {      if (e.localName == 'script') {
391        log ('start running a script');        logIndentLevel++;
392          log ('Running a script: start');
393    
394        var doc = this.ownerDocument;        var doc = this.ownerDocument || this;
395        var p = doc._parser;        var p = doc._parser;
396    
397        // 1. Script type        // 1. Script type
# Line 203  Line 406 
406        // 2.4. If the script element has its "already executed" flag set        // 2.4. If the script element has its "already executed" flag set
407        if (e.manakaiAlreadyExecuted) {        if (e.manakaiAlreadyExecuted) {
408          // 2.5. Abort these steps at this point.          // 2.5. Abort these steps at this point.
409          log ('running a script: aborted');          log ('Running a script: aborted');
410            logIndentLevel--;
411          return e;          return e;
412        }        }
413    
# Line 218  Line 422 
422        // 5.1.        // 5.1.
423        if (/* TODO: If the document is still being parsed && */        if (/* TODO: If the document is still being parsed && */
424            e.defer && !e.async) {            e.defer && !e.async) {
425          // TODO          p.scriptsExecutedAfterParsing.push (e);
426            log ('Running a script: aborted (defer)');
427        } else if (e.async && e.src != null) {        } else if (e.async && e.src != null) {
428          // TODO          // TODO
429        } else if (e.async && e.src == null        } else if (e.async && e.src == null
430                   /* && list of scripts that will execute asynchronously is not empty */) {                   /* && list of scripts that will execute asynchronously is not empty */) {
431          // TODO          // TODO
432        } else if (e.src != null && e.manakaiParserInserted) {        } else if (e.src != null && e.manakaiParserInserted) {
433          // TODO          if (p.scriptExecutedWhenParserResumes) {
434              log ('Error: There is a script that will execute as soon as the parser resumes.');
435            }
436            p.scriptExecutedWhenParserResumes = e;
437            log ('Running a script: aborted (src)');
438        } else if (e.src != null) {        } else if (e.src != null) {
439          // TODO          // TODO
440        } else {        } else {
441          executeScript (doc, e); // even if other scripts are already executing.          executeScript (doc, e); // even if other scripts are already executing.
442        }        }
443    
444        log ('end running a script');        log ('Running a script: end');
445          logIndentLevel--;
446      }      }
447    
448      return e;      return e;
# Line 241  Line 451 
451    function executeScript (doc, e) {    function executeScript (doc, e) {
452      log ('executing a script block: start');      log ('executing a script block: start');
453    
454      // If the load resulted in an error, then ... firing an error event ...      var s;
455        if (e.src != null) {
456          s = getExternalScript (e.src);
457    
458          // If the load resulted in an error, then ... firing an error event ...
459          if (s == null) {
460            log ('error event fired at the script element');
461            return;
462          }
463    
464          log ('External script loaded: "' + s + '"');
465        } else {
466          s = e.text;
467        }
468    
469      // If the load was successful      // If the load was successful
470      log ('load event fired at the script element');      log ('load event fired at the script element');
# Line 250  Line 473 
473      // Scripting is enabled, Document.designMode is disabled,      // Scripting is enabled, Document.designMode is disabled,
474      // Document is the active document in its browsing context      // Document is the active document in its browsing context
475    
       var s;  
       if (e.src != null) {  
         // TODO: from external file  
       } else {  
         s = e.text;  
       }  
   
476        parseAndRunScript (doc, s);        parseAndRunScript (doc, s);
477      }      }
478    
479      log ('executing a script block: end');      log ('executing a script block: end');
480    } // executeScript    } // executeScript
481    
482      function getExternalScript (uri) {
483        if (uri.match (/^javascript:/i)) {
484          var m;
485          if (m = uri.match (/^javascript:\s*(?:'([^']*)'|"([^"]+)")\s*$/i)) {
486            if (m[1]) {
487              return m[1];
488            } else if (m[2]) {
489              return m[2];
490            } else {
491              return null;
492            }
493          } else {
494            log ('Complex javascript: URI is not supported: <' + uri + '>');
495            return null;
496          }
497        } else {
498          log ('URI scheme not supported: <' + uri + '>');
499          return null;
500        }
501      } // getExternalScript
502    
503    function parseAndRunScript (doc, s) {    function parseAndRunScript (doc, s) {
504      while (true) {      while (true) {
505        var matched = false;        var matched = false;
# Line 299  Line 536 
536      }      }
537    }; // manakaiAppendText    }; // manakaiAppendText
538    
539      JSDocument.prototype.open = function () {
540        // Two or fewer arguments
541    
542        // Step 1.
543        var type = arguments[0] || 'text/html';
544        
545        // Step 2.
546        var replace = arguments[1] == 'replace';
547    
548        // Step 3.
549        if (this._parser &&
550            !this._parser.scriptCreated &&
551            this._parser.input.insertionPoint != undefined) {
552          log ('document.open () in parsing mode is ignored');
553          return this;
554        }
555    
556        // Step 4.
557        log ('onbeforeunload event fired');
558        log ('onunload event fired');
559    
560        // Step 5.
561        if (this._parser) {
562          // Discard the parser.
563        }
564    
565        // Step 6.
566        log ('document cleared by document.open ()');
567        this.childNodes = [];
568    
569        // Step 7.
570        this._parser = new Parser (new InputStream (''), this);
571        this._parser.scriptCreated = true;
572    
573        // Step 8.
574        this.manakaiIsHTML = true;
575    
576        // Step 9.
577        // If not text/html, ...
578    
579        // Step 10.
580        if (!replace) {
581          // History      
582        }
583    
584        // Step 11.
585        this._parser.setInsertionPoint (this._parser.input.s.length);
586    
587        // Step 12.
588        return this;
589      }; // document.open
590    
591    JSDocument.prototype.write = function () {    JSDocument.prototype.write = function () {
592        logIndentLevel++;
593    
594        var p = this._parser;
595    
596      // 1. If the insertion point is undefined, the open() method must be ...      // 1. If the insertion point is undefined, the open() method must be ...
597      //      if (isNaN (p.insertionPoint) || p.insertionPoint == undefined) {
598          this.open ();
599          p = this._parser;
600        }
601    
602      // 2. ... inserted into the input stream just before the insertion point.      // 2. ... inserted into the input stream just before the insertion point.
603      log ('document.write: insert "' + Array.join (arguments, '') + '"');      var s = Array.join (arguments, '');
604        log ('document.write: insert "' + s + '"' +
605             ' before "' +
606             p.input.s.substring (p.insertionPoint, p.insertionPoint + 10) + '"');
607        p.input.s = p.input.s.substring (0, p.insertionPoint) + s
608            + p.input.s.substring (p.insertionPoint, p.input.s.length);
609        p.insertionPoint += s.length;
610    
611      // 3. If there is a script that will execute as soon as the parser resumes      // 3. If there is a script that will execute as soon as the parser resumes
612      // TODO      if (p.scriptExecutedAfterParserResumes) {
613          log ('document.write: processed later (there is an unprocessed <script src>)');
614          logIndentLevel--;
615          return;
616        }
617    
618      // 4. Process the characters that were inserted, ...      // 4. Process the characters that were inserted, ...
619        var originalReentrant = p.reentrant;
620        p.reentrant = true;
621        p.parse ();
622        p.reentrant = originalReentrant;
623        // TODO: "Abort the processing of any nested invokations of the tokeniser,
624        // yielding control back to the caller." (<script> parsing).  Do we need
625        // to do something here?
626    
627      // 5. Return      // 5. Return
628      log ('document.write: return');      log ('document.write: return');
629    
630        logIndentLevel--;
631      return;      return;
632    }; // document.write    }; // document.write
633    
# Line 332  Line 647 
647        var node = n.childNodes[i];        var node = n.childNodes[i];
648        if (node instanceof JSElement) {        if (node instanceof JSElement) {
649          r += '| ' + indent + node.localName + '\n';          r += '| ' + indent + node.localName + '\n';
650            if (node.async) r += '| ' + indent + '  async=""\n';
651            if (node.defer) r += '| ' + indent + '  defer=""\n';
652            if (node.src != null) {
653              r += '| ' + indent + '  src="' + node.src + '"\n';
654            }
655          r += dumpTree (node, indent + '  ');          r += dumpTree (node, indent + '  ');
656        } else if (node instanceof JSText) {        } else if (node instanceof JSText) {
657          r += '| ' + indent + '"' + node.data + '"\n';          r += '| ' + indent + '"' + node.data + '"\n';
# Line 345  Line 665 
665  </head>  </head>
666  <body onload="  <body onload="
667    document.sourceElement = document.getElementsByTagName ('textarea')[0];    document.sourceElement = document.getElementsByTagName ('textarea')[0];
668    
669      var q = location.search;
670      if (q != null) {
671        q = q.substring (1).split (/;/);
672        for (var i = 0; i < q.length; i++) {
673          var v = q[i].split (/=/, 2);
674          v[0] = decodeURIComponent (v[0]);
675          v[1] = decodeURIComponent (v[1] || '');
676          if (v[0] == 's') {
677            document.sourceElement.value = v[1];
678          }
679        }
680      }
681    
682    document.logElement = document.getElementsByTagName ('output')[0];    document.logElement = document.getElementsByTagName ('output')[0];
683    update ();    update ();
684  ">  ">
685    <h1>Live Scripting <abbr title="Hypertext Markup Language">HTML</abbr>
686    Parser</h1>
687    
688  <textarea onchange=" update () ">&lt;html>  <h2>Markup to test
689    (<a href=data:, id=permalink rel=bookmark>permalink</a>,
690    <a href="http://software.hixie.ch/utilities/js/live-dom-viewer/"
691        id=ldvlink>Live <abbr title="Document Object Model">DOM</abbr>
692        Viewer</a>)</h2>
693    <p>
694    <textarea onkeydown=" update () " onchange=" update () " oninput=" update () ">&lt;html>
695  &lt;head>&lt;/head>&lt;body>  &lt;head>&lt;/head>&lt;body>
696  &lt;p>  &lt;p>
697  &lt;script>  &lt;script>
698  document.write ('aaaaaaa&lt;/p>\n&lt;script>\ndocument.write("cccccc")\n&lt;/', 'script>\nbbbbbb');  document.write ('aaaaaaa&lt;/p>&lt;script>document.write("cccccc");&lt;/', 'script>bbbbbb');
699  &lt;/script>  &lt;/script>
700  &lt;p>  &lt;p>
701  </textarea>  </textarea>
702    
703  <output></output>  <h2>Log</h2>
704    <p><output></output>
705    
706    <h2>Note</h2>
707    
708    <p>This is a <em>simplified</em> implementation of
709    <a href="http://www.whatwg.org/specs/web-apps/current-work/#parsing">HTML5
710    Parsing Algorithm</a>.  It only implements script-related part of the
711    algorithm.  Especially, this parser:
712    <ul>
713    <li>Does not support <code>DOCTYPE</code> and comment tokens.
714    <li>Does not support entities except for <code>&amp;quot;</code>,
715    <code>&amp;apos;</code>, and <code>&amp;amp;</code> in <code>script</code>
716    <code>src</code> attribute value.
717    <li>Does not support omissions of start or end tags, the <abbr>AAA</abbr>
718    algorithm, and so on.
719    <li>Does not raise parse errors for invalid attribute specifications in start
720    or end tags.
721    <li>Does not support CDATA/PCDATA element other than <code>script</code>.
722    <li>Does not support <code>&lt;!--</code>..<code>--></code> parsing rule
723    in <code>script</code> element.
724    <li>Does not support foreign (SVG or MathML) elements.
725    <li>Only supports <code>script</code> <code>type</code>
726    <code>text/javascript</code>.  <code>type</code> and <code>language</code>
727    attributes are ignored.
728    <li>Only supports <code>document.write</code>.
729    The script code must be match to the regular expression
730    <code>^\s*(?:document\.write\s*\(<var>v</var>\s*(?:,\s*<var>v</var>\s*)*\)\s*;\s*)*$</code>
731    where <var>v</var> is <code>"[^"]*"|'[^']*'</code>.
732    <li>Only supports <code>javascript:</code>
733    <abbr title="Uniform Resourace Identifiers">URI</abbr> scheme in the
734    <code>src</code> attribute of the <code>script</code> element.  In addition,
735    the <abbr title="Uniform Resource Identifiers">URI</abbr> must be conform to
736    the regular expression <code>^javascript:\s*(?:"[^"]*"|'[^']*')\s*$</code>.
737    </ul>
738    
739    <p>For some reason, this parser does not work in browsers that do
740    not support JavaScript 1.5.
741    
742  </body>  </body>
743  </html>  </html>
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