/[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 1.8 by wakaba, Sun Apr 27 08:56:34 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          e = e.replace (/^\s*([^\s=]+)\s*(?:=\s*(?:"([^"]*)"|'([^']*)'|([^"']+)))?/,
154          function (x, attrName, attrValue1, attrValue2, attrValue3) {
155            v = attrValue1 || attrValue2 || attrValue3;
156            v = v.replace (/&quot;/g, '"').replace (/&apos;/g, "'")
157                .replace (/&amp;/g, '&');
158            attrs[attrName.toLowerCase ()] = v;
159            return '';
160          });
161          if (e.length) {
162            log ('Broken start tag: "' + e + '"');
163          }
164          token = {type: 'start-tag', value: tagName, attrs: attrs};
165          p.insertionPoint -= s.length;
166        return '';        return '';
167      });      });
168      if (token) return token;      if (token) return token;
169        if (p.insertionPoint <= 0) {
170          return {type: 'abort'};
171        }
172      i.s = i.s.replace (/^[^<]+/, function (s) {      i.s = i.s.replace (/^[^<]+/, function (s) {
173          if (p.insertionPoint < s.length) {
174            token = {type: 'char', value: s.substring (0, p.insertionPoint)};
175            var ip = p.insertionPoint;
176            p.insertionPoint = 0;
177            return s.substring (ip, s.length);
178          }
179        token = {type: 'char', value: s};        token = {type: 'char', value: s};
180          p.insertionPoint -= s.length;
181        return '';        return '';
182      });      });
183      if (token) return token;      if (token) return token;
184      i.s = i.s.replace (/^[\s\S]/, function (s) {      i.s = i.s.replace (/^[\s\S]/, function (s) {
185        token = {type: 'char', value: s};        token = {type: 'char', value: s};
186          p.insertionPoint -= s.length;
187        return '';        return '';
188      });      });
189      if (token) return token;      if (token) return token;
# Line 82  Line 191 
191    } // getNextToken    } // getNextToken
192    
193    Parser.prototype.parse = function () {    Parser.prototype.parse = function () {
194      log ('start parsing');      logIndentLevel++;
195        log ('parse: start');
196    
197      while (true) {      while (true) {
198        var token = this.getNextToken ();        var token = this.getNextToken ();
# Line 92  Line 202 
202          if (token.value == 'script') {          if (token.value == 'script') {
203            // 1. Create an element for the token in the HTML namespace.            // 1. Create an element for the token in the HTML namespace.
204            var el = new JSElement (this.doc, token.value);            var el = new JSElement (this.doc, token.value);
205              if (token.attrs.async != null) el.async = true;
206              if (token.attrs.defer != null) el.defer = true;
207              if (token.attrs.src != null) el.src = token.attrs.src;
208    
209            // 2. Mark the element as being "parser-inserted".            // 2. Mark the element as being "parser-inserted".
210            el.manakaiParserInserted = true;            el.manakaiParserInserted = true;
# Line 109  Line 222 
222                el.manakaiAppendText (token.value);                el.manakaiAppendText (token.value);
223    
224              // 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
225              // TODO: 4.3. Until it stops tokenising.              // until it stops tokenising.
226              } else if (token.type == 'eof' ||              } else if (token.type == 'eof' ||
227                         (token.type == 'end-tag' && token.value == 'script')) {                         (token.type == 'end-tag' && token.value == 'script') ||
228                           token.type == 'abort') {
229                // 6. Switched back to the PCDATA state.                // 6. Switched back to the PCDATA state.
230                this.parseMode = 'pcdata';                this.parseMode = 'pcdata';
231    
# Line 138  Line 252 
252            }            }
253    
254            // 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 ...
255              var oldInsertionPoint = this.insertionPoint;
256            // 9.2. Let the insertion point be just before the next input ...            // 9.2. Let the insertion point be just before the next input ...
257              this.setInsertionPoint (0);
258    
259            // 10. Append the new element to the current node.            // 10. Append the new element to the current node.
260            this.openElements[this.openElements.length - 1].appendChild (el);            this.openElements[this.openElements.length - 1].appendChild (el);
261    
262            // 11. Let the insertion point have the value of the old ...            // 11. Let the insertion point have the value of the old ...
263    
264              oldInsertionPoint += this.insertionPoint;
265              this.setInsertionPoint (oldInsertionPoint);
266    
267            // 12. If there is a script that will execute as soon as ...            // 12. If there is a script that will execute as soon as ...
268                        while (this.scriptExecutedWhenParserResumes) {
269                // 12.1. If the tree construction stage is being called reentrantly
270                if (this.reentrant) {
271                  log ('parse: abort (reentrance)');
272                  logIndentLevel--;
273                  return;
274    
275                // 12.2. Otherwise
276                } else {
277                  // 1.
278                  var script = this.scriptExecutedWhenParserResumes;
279                  this.scriptExecutedWhenParserResumes = null;
280    
281                  // 2. Pause until the script has completed loading.
282                  //
283    
284                  // 3. Let the insertion point to just before the next input char.
285                  this.setInsertionPoint (0);
286    
287                  // 4. Execute the script.
288                  executeScript (this.doc, script);
289    
290                  // 5. Let the insertion point be undefined again.
291                  this.setInsertionPoint (undefined);
292    
293                  // 6. If there is once again a script that will execute ...
294                  //
295                }
296              }
297          } else {          } else {
298            var el = new JSElement (this.doc, token.value);            var el = new JSElement (this.doc, token.value);
299            this.openElements[this.openElements.length - 1].appendChild (el);            this.openElements[this.openElements.length - 1].appendChild (el);
# Line 161  Line 306 
306          } else {          } else {
307            log ('parse error: unmatched end tag: ' + token.value);            log ('parse error: unmatched end tag: ' + token.value);
308          }          }
309          } else if (token.type == 'char') {
310            this.openElements[this.openElements.length - 1].manakaiAppendText
311                (token.value);
312        } else if (token.type == 'eof') {        } else if (token.type == 'eof') {
313          break;          break;
314          } else if (token.type == 'abort') {
315            log ('parse: abort');
316            logIndentLevel--;
317            return;
318        }        }
319      }      }
320    
321      log ('stop parsing');      log ('stop parsing');
322    
323        // readyState = 'interactive'
324    
325        // "When a script completes loading" rules start applying.
326    
327        // TODO: Handles "list of scripts that will execute as soon as possible"
328        // and "list of scripts that will execute asynchronously"
329    
330        // Handle "list of scripts that will execute when the document has finished
331        // parsing".
332        var list = this.scriptsExecutedAfterParsing;
333        while (list.length > 0) {
334          // TODO: break unless completed loading
335    
336          // Step 1.
337          //
338    
339          // Step 2. and Step 3.
340          log ('Executing a |defer|red script...');
341          executeScript (this.doc, list.shift ());
342    
343          // Step 4.
344        }
345    
346        log ('DOMContentLoaded event fired');
347    
348        // "delays tha load event" things has completed:
349        // readyState = 'complete'
350        log ('load event fired');
351    
352        logIndentLevel--;
353    } // parse    } // parse
354    
355      Parser.prototype.setInsertionPoint = function (ip) {
356        if (ip == undefined || ip == null || isNaN (ip)) {
357          log ('insertion point: set to undefined');
358          this.insertionPoint = undefined;
359        } else if (ip == this.input.s.length) {
360          log ('insertion point: end of file');
361          this.insertionPoint = ip;
362        } else {
363          log ('insertion point: set to ' + ip +
364               ' (before "' + this.input.s.substring (0, 10) + '")');
365          this.insertionPoint = ip;
366        }
367      }; // setInsertionPoint
368    
369    function JSDocument (p) {    function JSDocument (p) {
370      this.childNodes = [];      this.childNodes = [];
371      this._parser = p;      this._parser = p;
# Line 186  Line 383 
383      e.parentNode = this;      e.parentNode = this;
384    
385      if (e.localName == 'script') {      if (e.localName == 'script') {
386        log ('start running a script');        logIndentLevel++;
387          log ('Running a script: start');
388    
389        var doc = this.ownerDocument;        var doc = this.ownerDocument || this;
390        var p = doc._parser;        var p = doc._parser;
391    
392        // 1. Script type        // 1. Script type
# Line 203  Line 401 
401        // 2.4. If the script element has its "already executed" flag set        // 2.4. If the script element has its "already executed" flag set
402        if (e.manakaiAlreadyExecuted) {        if (e.manakaiAlreadyExecuted) {
403          // 2.5. Abort these steps at this point.          // 2.5. Abort these steps at this point.
404          log ('running a script: aborted');          log ('Running a script: aborted');
405            logIndentLevel--;
406          return e;          return e;
407        }        }
408    
# Line 218  Line 417 
417        // 5.1.        // 5.1.
418        if (/* TODO: If the document is still being parsed && */        if (/* TODO: If the document is still being parsed && */
419            e.defer && !e.async) {            e.defer && !e.async) {
420          // TODO          p.scriptsExecutedAfterParsing.push (e);
421            log ('Running a script: aborted (defer)');
422        } else if (e.async && e.src != null) {        } else if (e.async && e.src != null) {
423          // TODO          // TODO
424        } else if (e.async && e.src == null        } else if (e.async && e.src == null
425                   /* && list of scripts that will execute asynchronously is not empty */) {                   /* && list of scripts that will execute asynchronously is not empty */) {
426          // TODO          // TODO
427        } else if (e.src != null && e.manakaiParserInserted) {        } else if (e.src != null && e.manakaiParserInserted) {
428          // TODO          if (p.scriptExecutedWhenParserResumes) {
429              log ('Error: There is a script that will execute as soon as the parser resumes.');
430            }
431            p.scriptExecutedWhenParserResumes = e;
432            log ('Running a script: aborted (src)');
433        } else if (e.src != null) {        } else if (e.src != null) {
434          // TODO          // TODO
435        } else {        } else {
436          executeScript (doc, e); // even if other scripts are already executing.          executeScript (doc, e); // even if other scripts are already executing.
437        }        }
438    
439        log ('end running a script');        log ('Running a script: end');
440          logIndentLevel--;
441      }      }
442    
443      return e;      return e;
# Line 241  Line 446 
446    function executeScript (doc, e) {    function executeScript (doc, e) {
447      log ('executing a script block: start');      log ('executing a script block: start');
448    
449      // If the load resulted in an error, then ... firing an error event ...      var s;
450        if (e.src != null) {
451          s = getExternalScript (e.src);
452    
453          // If the load resulted in an error, then ... firing an error event ...
454          if (s == null) {
455            log ('error event fired at the script element');
456            return;
457          }
458    
459          log ('External script loaded: "' + s + '"');
460        } else {
461          s = e.text;
462        }
463    
464      // If the load was successful      // If the load was successful
465      log ('load event fired at the script element');      log ('load event fired at the script element');
# Line 250  Line 468 
468      // Scripting is enabled, Document.designMode is disabled,      // Scripting is enabled, Document.designMode is disabled,
469      // Document is the active document in its browsing context      // Document is the active document in its browsing context
470    
       var s;  
       if (e.src != null) {  
         // TODO: from external file  
       } else {  
         s = e.text;  
       }  
   
471        parseAndRunScript (doc, s);        parseAndRunScript (doc, s);
472      }      }
473    
474      log ('executing a script block: end');      log ('executing a script block: end');
475    } // executeScript    } // executeScript
476    
477      function getExternalScript (uri) {
478        if (uri.match (/^javascript:/i)) {
479          var m;
480          if (m = uri.match (/^javascript:\s*(?:'([^']*)'|"([^"]+)")\s*$/i)) {
481            if (m[1]) {
482              return m[1];
483            } else if (m[2]) {
484              return m[2];
485            } else {
486              return null;
487            }
488          } else {
489            log ('Complex javascript: URI is not supported: <' + uri + '>');
490            return null;
491          }
492        } else {
493          log ('URI scheme not supported: <' + uri + '>');
494          return null;
495        }
496      } // getExternalScript
497    
498    function parseAndRunScript (doc, s) {    function parseAndRunScript (doc, s) {
499      while (true) {      while (true) {
500        var matched = false;        var matched = false;
# Line 299  Line 531 
531      }      }
532    }; // manakaiAppendText    }; // manakaiAppendText
533    
534      JSDocument.prototype.open = function () {
535        // Two or fewer arguments
536    
537        // Step 1.
538        var type = arguments[0] || 'text/html';
539        
540        // Step 2.
541        var replace = arguments[1] == 'replace';
542    
543        // Step 3.
544        if (this._parser &&
545            !this._parser.scriptCreated &&
546            this._parser.input.insertionPoint != undefined) {
547          log ('document.open () in parsing mode is ignored');
548          return this;
549        }
550    
551        // Step 4.
552        log ('onbeforeunload event fired');
553        log ('onunload event fired');
554    
555        // Step 5.
556        if (this._parser) {
557          // Discard the parser.
558        }
559    
560        // Step 6.
561        log ('document cleared by document.open ()');
562        this.childNodes = [];
563    
564        // Step 7.
565        this._parser = new Parser (new InputStream (''), this);
566        this._parser.scriptCreated = true;
567    
568        // Step 8.
569        this.manakaiIsHTML = true;
570    
571        // Step 9.
572        // If not text/html, ...
573    
574        // Step 10.
575        if (!replace) {
576          // History      
577        }
578    
579        // Step 11.
580        this._parser.setInsertionPoint (this._parser.input.s.length);
581    
582        // Step 12.
583        return this;
584      }; // document.open
585    
586    JSDocument.prototype.write = function () {    JSDocument.prototype.write = function () {
587        logIndentLevel++;
588    
589        var p = this._parser;
590    
591      // 1. If the insertion point is undefined, the open() method must be ...      // 1. If the insertion point is undefined, the open() method must be ...
592      //      if (isNaN (p.insertionPoint) || p.insertionPoint == undefined) {
593          this.open ();
594          p = this._parser;
595        }
596    
597      // 2. ... inserted into the input stream just before the insertion point.      // 2. ... inserted into the input stream just before the insertion point.
598      log ('document.write: insert "' + Array.join (arguments, '') + '"');      var s = Array.join (arguments, '');
599        log ('document.write: insert "' + s + '"' +
600             ' before "' +
601             p.input.s.substring (p.insertionPoint, p.insertionPoint + 10) + '"');
602        p.input.s = p.input.s.substring (0, p.insertionPoint) + s
603            + p.input.s.substring (p.insertionPoint, p.input.s.length);
604        p.insertionPoint += s.length;
605    
606      // 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
607      // TODO      if (p.scriptExecutedAfterParserResumes) {
608          log ('document.write: processed later (there is an unprocessed <script src>)');
609          logIndentLevel--;
610          return;
611        }
612    
613      // 4. Process the characters that were inserted, ...      // 4. Process the characters that were inserted, ...
614        var originalReentrant = p.reentrant;
615        p.reentrant = true;
616        p.parse ();
617        p.reentrant = originalReentrant;
618        // TODO: "Abort the processing of any nested invokations of the tokeniser,
619        // yielding control back to the caller." (<script> parsing).  Do we need
620        // to do something here?
621    
622      // 5. Return      // 5. Return
623      log ('document.write: return');      log ('document.write: return');
624    
625        logIndentLevel--;
626      return;      return;
627    }; // document.write    }; // document.write
628    
# Line 332  Line 642 
642        var node = n.childNodes[i];        var node = n.childNodes[i];
643        if (node instanceof JSElement) {        if (node instanceof JSElement) {
644          r += '| ' + indent + node.localName + '\n';          r += '| ' + indent + node.localName + '\n';
645            if (node.async) r += '| ' + indent + '  async=""\n';
646            if (node.defer) r += '| ' + indent + '  defer=""\n';
647            if (node.src) r += '| ' + indent + '  src="' + node.src + '"\n';
648          r += dumpTree (node, indent + '  ');          r += dumpTree (node, indent + '  ');
649        } else if (node instanceof JSText) {        } else if (node instanceof JSText) {
650          r += '| ' + indent + '"' + node.data + '"\n';          r += '| ' + indent + '"' + node.data + '"\n';
# Line 345  Line 658 
658  </head>  </head>
659  <body onload="  <body onload="
660    document.sourceElement = document.getElementsByTagName ('textarea')[0];    document.sourceElement = document.getElementsByTagName ('textarea')[0];
661    
662      var q = location.search;
663      if (q != null) {
664        q = q.substring (1).split (/;/);
665        for (var i = 0; i < q.length; i++) {
666          var v = q[i].split (/=/, 2);
667          v[0] = decodeURIComponent (v[0]);
668          v[1] = decodeURIComponent (v[1] || '');
669          if (v[0] == 's') {
670            document.sourceElement.value = v[1];
671          }
672        }
673      }
674    
675    document.logElement = document.getElementsByTagName ('output')[0];    document.logElement = document.getElementsByTagName ('output')[0];
676    update ();    update ();
677  ">  ">
678    <h1>Live Scripting <abbr title="Hypertext Markup Language">HTML</abbr>
679    Parser</h1>
680    
681  <textarea onchange=" update () ">&lt;html>  <h2>Markup to test
682    (<a href=data:, id=permalink rel=bookmark>permalink</a>,
683    <a href="http://software.hixie.ch/utilities/js/live-dom-viewer/"
684        id=ldvlink>Live <abbr title="Document Object Model">DOM</abbr>
685        Viewer</a>)</h2>
686    <p>
687    <textarea onkeydown=" update () " onchange=" update () " oninput=" update () ">&lt;html>
688  &lt;head>&lt;/head>&lt;body>  &lt;head>&lt;/head>&lt;body>
689  &lt;p>  &lt;p>
690  &lt;script>  &lt;script>
691  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');
692  &lt;/script>  &lt;/script>
693  &lt;p>  &lt;p>
694  </textarea>  </textarea>
695    
696  <output></output>  <h2>Log</h2>
697    <p><output></output>
698    
699    <h2>Note</h2>
700    
701    <p>This is a <em>simplified</em> implementation of
702    <a href="http://www.whatwg.org/specs/web-apps/current-work/#parsing">HTML5
703    Parsing Algorithm</a>.  It only implements script-related part of the
704    algorithm.  Especially, this parser:
705    <ul>
706    <li>Does not support <code>DOCTYPE</code> and comment tokens.
707    <li>Does not support entities except for <code>&amp;quot;</code>,
708    <code>&amp;apos;</code>, and <code>&amp;amp;</code> in <code>script</code>
709    <code>src</code> attribute value.
710    <li>Does not support omissions of start or end tags, the <abbr>AAA</abbr>
711    algorithm, and so on.
712    <li>Does not raise parse errors for invalid attribute specifications in start
713    or end tags.
714    <li>Does not support CDATA/PCDATA element other than <code>script</code>.
715    <li>Does not support <code>&lt;!--</code>..<code>--></code> parsing rule
716    in <code>script</code> element.
717    <li>Does not support foreign (SVG or MathML) elements.
718    <li>Only supports <code>script</code> <code>type</code>
719    <code>text/javascript</code>.  <code>type</code> and <code>language</code>
720    attributes are ignored.
721    <li>Only supports <code>document.write</code>.
722    The script code must be match to the regular expression
723    <code>^\s*(?:document\.write\s*\(<var>v</var>\s*(?:,\s*<var>v</var>\s*)*\)\s*;\s*)*$</code>
724    where <var>v</var> is <code>"[^"]*"|'[^']*'</code>.
725    <li>Only supports <code>javascript:</code>
726    <abbr title="Uniform Resourace Identifiers">URI</abbr> scheme in the
727    <code>src</code> attribute of the <code>script</code> element.  In addition,
728    the <abbr title="Uniform Resource Identifiers">URI</abbr> must be conform to
729    the regular expression <code>^javascript:\s*(?:"[^"]*"|'[^']*')\s*$</code>.
730    </ul>
731    
732    <p>For some reason, this parser does not work in browsers that do
733    not support JavaScript 1.5.
734    
735    <!-- TODO: multiple attributes are not supported yet -->
736    
737  </body>  </body>
738  </html>  </html>
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