/[suikacvs]/markup/html/scripting-parser/parser.html
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revision 1.3 by wakaba, Sun Apr 20 10:02:43 2008 UTC revision 1.10 by wakaba, Sun Apr 27 10:34:18 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          
51          log (dumpTree (doc, ''));
52          
53          if (p.hasAsyncScript) {
54            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');
55          }
56        }
57      } // update2
58    
59      var logIndentLevel = 0;
60    function log (s) {    function log (s) {
61        for (var i = 0; i < logIndentLevel; i++) {
62          s = '  ' + s;
63        }
64      document.logElement.appendChild (document.createTextNode (s + "\n"));      document.logElement.appendChild (document.createTextNode (s + "\n"));
65    } // log    } // log
66    
# Line 32  Line 68 
68      this.s = s;      this.s = s;
69    } // InputStream    } // InputStream
70    
71    function Parser (i) {    function Parser (i, doc) {
72      this.parseMode = 'pcdata';      this.parseMode = 'pcdata';
73      this.doc = new JSDocument (this);      if (!doc) {
74      this.openElements = [this.doc];        doc = new JSDocument (this);
75      this.in = i;        doc.manakaiIsHTML = true;
76        }
77        this.doc = doc;
78        this.openElements = [doc];
79        this.input = i;
80        this.scriptsExecutedAfterParsing = [];
81        this.scriptsExecutedSoon = [];
82    } // Parser    } // Parser
83    
84    Parser.prototype.getNextToken = function () {    Parser.prototype.getNextToken = function () {
85      var p = this;      var p = this;
86      var i = this.in;      var i = this.input;
87      if (this.parseMode == 'script') {      if (this.parseMode == 'script') {
88        var token;        var token;
89        if (p.insertionPoint <= 0) {        if (p.insertionPoint <= 0) {
90          return {type: 'abort'};          return {type: 'abort'};
91        }        }
92        i.s = i.s.replace (/^([\s\S]+?)<\/[Ss][Cc][Rr][Ii][Pp][Tt]>/,        i.s = i.s.replace (/^([^<]+)/,
93        function (s, t) {        function (s, t) {
94          if (0 < p.insertionPoint && p.insertionPoint < t.length) {          if (0 < p.insertionPoint && p.insertionPoint < t.length) {
95            token = {type: 'char', value: t.substring (0, p.insertionPoint)};            token = {type: 'char', value: t.substring (0, p.insertionPoint)};
96            var ip = p.insertionPoint;            var ip = p.insertionPoint;
97            p.insertionPoint = 0;            p.insertionPoint = 0;
98            return t.substring (ip, t.length) +            return t.substring (ip, t.length);
               s.substring (s.length - 9, s.length);  
99          }          }
100          token = {type: 'char', value: t};          token = {type: 'char', value: t};
101          p.insertionPoint -= s.length;          p.insertionPoint -= t.length;
102          return '<' + '/script>';          return '';
103        });        });
104        if (token) return token;        if (token) return token;
105        i.s = i.s.replace (/^<\/[Ss][Cc][Rr][Ii][Pp][Tt]>/, function (s) {        i.s = i.s.replace (/^<\/[Ss][Cc][Rr][Ii][Pp][Tt]>/, function (s) {
106          if (s.length < p.insertionPoint) {          if (p.insertionPoint < s.length) {
107            token = {type: 'abort'};            token = {type: 'abort'};
108            return s;            return s;
109          }          }
# Line 71  Line 112 
112          return '';          return '';
113        });        });
114        if (token) return token;        if (token) return token;
115          var m;
116          if ((p.insertionPoint < '</script'.length) &&
117              (m = i.s.match (/^<\/([SCRIPTscript]+)/))) {
118            var v = m[1].substring (0, p.insertionPoint).toLowerCase ();
119            if (v == 'script'.substring (0, p.insertionPoint - '</'.length)) {
120              return {type: 'abort'};
121            }
122          }
123          i.s = i.s.replace (/^</,
124          function (s) {
125            token = {type: 'char', value: s};
126            p.insertionPoint -= s.length;
127            return '';
128          });
129          if (token) return token;
130        return {type: 'eof'};        return {type: 'eof'};
131      }      }
132    
133      var token;      var token;
134      i.s = i.s.replace (/^<\/([^>]+)>/, function (s, e) {      i.s = i.s.replace (/^<\/([^>]+)(?:>|$)/, function (s, e) {
135        if (p.insertionPoint < s.length) {        if (p.insertionPoint < s.length ||
136              (p.insertionPoint <= s.length &&
137               s.substring (s.length - 1, 1) != '>')) {
138          token = {type: 'abort'};          token = {type: 'abort'};
139          return s;          return s;
140        }        }
# Line 85  Line 143 
143        return '';        return '';
144      });      });
145      if (token) return token;      if (token) return token;
146      i.s = i.s.replace (/^<([^>]+)>/, function (s, e) {      i.s = i.s.replace (/^<([^>]+)(?:>|$)/, function (s, e) {
147        if (p.insertionPoint < s.length) {        if (p.insertionPoint < s.length ||
148              (p.insertionPoint <= s.length &&
149               s.substring (s.length - 1, 1) != '>')) {
150          token = {type: 'abort'};          token = {type: 'abort'};
151          return s;          return s;
152        }        }
153        token = {type: 'start-tag', value: e.toLowerCase ()};        var tagName;
154          var attrs = {};
155          e = e.replace (/^[\S]+/, function (v) {
156            tagName = v.toLowerCase ();
157            return '';
158          });
159          while (true) {
160            var m = false;
161            e = e.replace (/^\s*([^\s=]+)\s*(?:=\s*(?:"([^"]*)"|'([^']*)'|([^"'\s]*)))?/,
162            function (x, attrName, attrValue1, attrValue2, attrValue3) {
163              v = attrValue1 || attrValue2 || attrValue3;
164              v = v.replace (/&quot;/g, '"').replace (/&apos;/g, "'")
165                  .replace (/&amp;/g, '&');
166              attrs[attrName.toLowerCase ()] = v;
167              m = true;
168              return '';
169            });
170            if (!m) break;
171          }
172          if (e.length) {
173            log ('Broken start tag: "' + e + '"');
174          }
175          token = {type: 'start-tag', value: tagName, attrs: attrs};
176        p.insertionPoint -= s.length;        p.insertionPoint -= s.length;
177        return '';        return '';
178      });      });
# Line 120  Line 202 
202    } // getNextToken    } // getNextToken
203    
204    Parser.prototype.parse = function () {    Parser.prototype.parse = function () {
205      log ('start parsing');      logIndentLevel++;
206        log ('parse: start');
207    
208      while (true) {      while (true) {
209        var token = this.getNextToken ();        var token = this.getNextToken ();
# Line 130  Line 213 
213          if (token.value == 'script') {          if (token.value == 'script') {
214            // 1. Create an element for the token in the HTML namespace.            // 1. Create an element for the token in the HTML namespace.
215            var el = new JSElement (this.doc, token.value);            var el = new JSElement (this.doc, token.value);
216              if (token.attrs.async != null) el.async = true;
217              if (token.attrs.defer != null) el.defer = true;
218              if (token.attrs.src != null) el.src = token.attrs.src;
219    
220            // 2. Mark the element as being "parser-inserted".            // 2. Mark the element as being "parser-inserted".
221            el.manakaiParserInserted = true;            el.manakaiParserInserted = true;
# Line 185  Line 271 
271            this.openElements[this.openElements.length - 1].appendChild (el);            this.openElements[this.openElements.length - 1].appendChild (el);
272    
273            // 11. Let the insertion point have the value of the old ...            // 11. Let the insertion point have the value of the old ...
274    
275              oldInsertionPoint += this.insertionPoint;
276            this.setInsertionPoint (oldInsertionPoint);            this.setInsertionPoint (oldInsertionPoint);
277    
278            // 12. If there is a script that will execute as soon as ...            // 12. If there is a script that will execute as soon as ...
279                        while (this.scriptExecutedWhenParserResumes) {
280                // 12.1. If the tree construction stage is being called reentrantly
281                if (this.reentrant) {
282                  log ('parse: abort (reentrance)');
283                  logIndentLevel--;
284                  return;
285    
286                // 12.2. Otherwise
287                } else {
288                  // 1.
289                  var script = this.scriptExecutedWhenParserResumes;
290                  this.scriptExecutedWhenParserResumes = null;
291    
292                  // 2. Pause until the script has completed loading.
293                  //
294    
295                  // 3. Let the insertion point to just before the next input char.
296                  this.setInsertionPoint (0);
297    
298                  // 4. Execute the script.
299                  executeScript (this.doc, script);
300    
301                  // 5. Let the insertion point be undefined again.
302                  this.setInsertionPoint (undefined);
303    
304                  // 6. If there is once again a script that will execute ...
305                  //
306                }
307              }
308          } else {          } else {
309            var el = new JSElement (this.doc, token.value);            var el = new JSElement (this.doc, token.value);
310            this.openElements[this.openElements.length - 1].appendChild (el);            this.openElements[this.openElements.length - 1].appendChild (el);
# Line 209  Line 324 
324          break;          break;
325        } else if (token.type == 'abort') {        } else if (token.type == 'abort') {
326          log ('parse: abort');          log ('parse: abort');
327            logIndentLevel--;
328          return;          return;
329        }        }
330      }      }
331    
332      log ('stop parsing');      log ('stop parsing');
333    
334        // readyState = 'interactive'
335    
336        // "When a script completes loading" rules start applying.
337    
338        // List of scripts that will execute as soon as possible
339        for (var i = 0; i < this.scriptsExecutedSoon.length; i++) {
340          var e = this.scriptsExecutedSoon[i];
341    
342          // If it has completed loading
343          log ('Execute an external script not inserted by parser...');
344          executeScript (this.doc, e);
345    
346          // NOTE: It MAY be executed before the end of the parsing, according
347          // to the spec.
348          this.hasAsyncScript = true;
349        }
350    
351        // TODO: Handles
352        // "list of scripts that will execute asynchronously"
353    
354        // Handle "list of scripts that will execute when the document has finished
355        // parsing".
356        var list = this.scriptsExecutedAfterParsing;
357        while (list.length > 0) {
358          // TODO: break unless completed loading
359    
360          // Step 1.
361          //
362    
363          // Step 2. and Step 3.
364          log ('Executing a |defer|red script...');
365          executeScript (this.doc, list.shift ());
366    
367          // Step 4.
368        }
369    
370        log ('DOMContentLoaded event fired');
371    
372        // "delays tha load event" things has completed:
373        // readyState = 'complete'
374        log ('load event fired');
375    
376        logIndentLevel--;
377    } // parse    } // parse
378    
379    Parser.prototype.setInsertionPoint = function (ip) {    Parser.prototype.setInsertionPoint = function (ip) {
380      if (ip == undefined || ip == null || isNaN (ip)) {      if (ip == undefined || ip == null || isNaN (ip)) {
381        log ('insertion point: set to undefined');        log ('insertion point: set to undefined');
382        this.insertionPoint = undefined;        this.insertionPoint = undefined;
383        } else if (ip == this.input.s.length) {
384          log ('insertion point: end of file');
385          this.insertionPoint = ip;
386      } else {      } else {
387        log ('insertion point: set to ' + ip +        log ('insertion point: set to ' + ip +
388             ' (before "' + this.in.s.substring (0, 10) + '")');             ' (before "' + this.input.s.substring (0, 10) + '")');
389        this.insertionPoint = ip;        this.insertionPoint = ip;
390      }      }
391    }; // setInsertionPoint    }; // setInsertionPoint
# Line 244  Line 407 
407      e.parentNode = this;      e.parentNode = this;
408    
409      if (e.localName == 'script') {      if (e.localName == 'script') {
410        log ('start running a script');        logIndentLevel++;
411          log ('Running a script: start');
412    
413        var doc = this.ownerDocument || this;        var doc = this.ownerDocument || this;
414        var p = doc._parser;        var p = doc._parser;
# Line 261  Line 425 
425        // 2.4. If the script element has its "already executed" flag set        // 2.4. If the script element has its "already executed" flag set
426        if (e.manakaiAlreadyExecuted) {        if (e.manakaiAlreadyExecuted) {
427          // 2.5. Abort these steps at this point.          // 2.5. Abort these steps at this point.
428          log ('running a script: aborted');          log ('Running a script: aborted');
429            logIndentLevel--;
430          return e;          return e;
431        }        }
432    
# Line 276  Line 441 
441        // 5.1.        // 5.1.
442        if (/* TODO: If the document is still being parsed && */        if (/* TODO: If the document is still being parsed && */
443            e.defer && !e.async) {            e.defer && !e.async) {
444          // TODO          p.scriptsExecutedAfterParsing.push (e);
445            log ('Running a script: aborted (defer)');
446        } else if (e.async && e.src != null) {        } else if (e.async && e.src != null) {
447          // TODO          // TODO
448        } else if (e.async && e.src == null        } else if (e.async && e.src == null
449                   /* && list of scripts that will execute asynchronously is not empty */) {                   /* && list of scripts that will execute asynchronously is not empty */) {
450          // TODO          // TODO
451        } else if (e.src != null && e.manakaiParserInserted) {        } else if (e.src != null && e.manakaiParserInserted) {
452          // TODO          if (p.scriptExecutedWhenParserResumes) {
453              log ('Error: There is a script that will execute as soon as the parser resumes.');
454            }
455            p.scriptExecutedWhenParserResumes = e;
456            log ('Running a script: aborted (src parser-inserted)');
457        } else if (e.src != null) {        } else if (e.src != null) {
458          // TODO          p.scriptsExecutedSoon.push (e);
459            log ('Running a script: aborted (src)');
460        } else {        } else {
461          executeScript (doc, e); // even if other scripts are already executing.          executeScript (doc, e); // even if other scripts are already executing.
462        }        }
463    
464        log ('end running a script');        log ('Running a script: end');
465          logIndentLevel--;
466      }      }
467    
468      return e;      return e;
# Line 299  Line 471 
471    function executeScript (doc, e) {    function executeScript (doc, e) {
472      log ('executing a script block: start');      log ('executing a script block: start');
473    
474      // If the load resulted in an error, then ... firing an error event ...      var s;
475        if (e.src != null) {
476          s = getExternalScript (e.src);
477    
478          // If the load resulted in an error, then ... firing an error event ...
479          if (s == null) {
480            log ('error event fired at the script element');
481            return;
482          }
483    
484          log ('External script loaded: "' + s + '"');
485        } else {
486          s = e.text;
487        }
488    
489      // If the load was successful      // If the load was successful
490      log ('load event fired at the script element');      log ('load event fired at the script element');
# Line 308  Line 493 
493      // Scripting is enabled, Document.designMode is disabled,      // Scripting is enabled, Document.designMode is disabled,
494      // Document is the active document in its browsing context      // Document is the active document in its browsing context
495    
       var s;  
       if (e.src != null) {  
         // TODO: from external file  
       } else {  
         s = e.text;  
       }  
   
496        parseAndRunScript (doc, s);        parseAndRunScript (doc, s);
497      }      }
498    
499      log ('executing a script block: end');      log ('executing a script block: end');
500    } // executeScript    } // executeScript
501    
502      function getExternalScript (uri) {
503        if (uri.match (/^javascript:/i)) {
504          var m;
505          if (m = uri.match (/^javascript:\s*(?:'([^']*)'|"([^"]+)")\s*$/i)) {
506            if (m[1]) {
507              return m[1].replace (/\\u([0-9A-F]{4})/g, function (s, v) {
508                return String.fromCharCode (parseInt ('0x' + v));
509              });
510            } else if (m[2]) {
511              return m[2].replace (/\\u([0-9A-F]{4})/g, function (s, v) {
512                return String.fromCharCode (parseInt ('0x' + v));
513              });
514            } else {
515              return null;
516            }
517          } else {
518            log ('Complex javascript: URI is not supported: <' + uri + '>');
519            return null;
520          }
521        } else {
522          log ('URI scheme not supported: <' + uri + '>');
523          return null;
524        }
525      } // getExternalScript
526    
527    function parseAndRunScript (doc, s) {    function parseAndRunScript (doc, s) {
528      while (true) {      while (true) {
529        var matched = false;        var matched = false;
# Line 334  Line 537 
537          doc.write.apply (doc, args);          doc.write.apply (doc, args);
538          return '';          return '';
539        });        });
540          s = s.replace (/^\s*var\s+s\s*=\s*document\.createElement\s*\(\s*['"]script['"]\s*\)\s*;\s*s\.src\s*=\s*(?:'(javascript:[^']*)'|"(javascript:[^"]*)")\s*;\s*document\.documentElement\.appendChild\s*\(\s*s\s*\)\s*;\s*/,
541          function (s, t, u) {
542            matched = true;
543            var args = [t ? t : u];
544            doc._insertExternalScript.apply (doc, args);
545            return '';
546          });
547        if (s == '') break;        if (s == '') break;
548        if (!matched) {        if (!matched) {
549          log ('Script parse error: "' + s + '"');          log ('Script parse error: "' + s + '"');
# Line 357  Line 567 
567      }      }
568    }; // manakaiAppendText    }; // manakaiAppendText
569    
570      JSDocument.prototype.open = function () {
571        // Two or fewer arguments
572    
573        // Step 1.
574        var type = arguments[0] || 'text/html';
575        
576        // Step 2.
577        var replace = arguments[1] == 'replace';
578    
579        // Step 3.
580        if (this._parser &&
581            !this._parser.scriptCreated &&
582            this._parser.input.insertionPoint != undefined) {
583          log ('document.open () in parsing mode is ignored');
584          return this;
585        }
586    
587        // Step 4.
588        log ('onbeforeunload event fired');
589        log ('onunload event fired');
590    
591        // Step 5.
592        if (this._parser) {
593          // Discard the parser.
594        }
595    
596        // Step 6.
597        log ('document cleared by document.open ()');
598        this.childNodes = [];
599    
600        // Step 7.
601        this._parser = new Parser (new InputStream (''), this);
602        this._parser.scriptCreated = true;
603    
604        // Step 8.
605        this.manakaiIsHTML = true;
606    
607        // Step 9.
608        // If not text/html, ...
609    
610        // Step 10.
611        if (!replace) {
612          // History      
613        }
614    
615        // Step 11.
616        this._parser.setInsertionPoint (this._parser.input.s.length);
617    
618        // Step 12.
619        return this;
620      }; // document.open
621    
622    JSDocument.prototype.write = function () {    JSDocument.prototype.write = function () {
623        logIndentLevel++;
624    
625      var p = this._parser;      var p = this._parser;
626    
627      // 1. If the insertion point is undefined, the open() method must be ...      // 1. If the insertion point is undefined, the open() method must be ...
628      if (p.insertionPoint == NaN || p.insertionPoint == undefined) {      if (isNaN (p.insertionPoint) || p.insertionPoint == undefined) {
629        // TODO: open ()        this.open ();
630          p = this._parser;
631      }      }
632    
633      // 2. ... inserted into the input stream just before the insertion point.      // 2. ... inserted into the input stream just before the insertion point.
634      var s = Array.join (arguments, '');      var s = Array.join (arguments, '');
635      log ('document.write: insert "' + s + '"' +      log ('document.write: insert "' + s + '"' +
636           ' before "' + p.in.s.substring (p.insertionPoint, p.insertionPoint + 10) + '"');           ' before "' +
637      p.in.s = p.in.s.substring (0, p.insertionPoint) + s           p.input.s.substring (p.insertionPoint, p.insertionPoint + 10) + '"');
638          + p.in.s.substring (p.insertionPoint, p.in.s.length);      p.input.s = p.input.s.substring (0, p.insertionPoint) + s
639            + p.input.s.substring (p.insertionPoint, p.input.s.length);
640      p.insertionPoint += s.length;      p.insertionPoint += s.length;
641    
642      // 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
643      // TODO      if (p.scriptExecutedAfterParserResumes) {
644          log ('document.write: processed later (there is an unprocessed <script src>)');
645          logIndentLevel--;
646          return;
647        }
648    
649      // 4. Process the characters that were inserted, ...      // 4. Process the characters that were inserted, ...
650        var originalReentrant = p.reentrant;
651        p.reentrant = true;
652      p.parse ();      p.parse ();
653        p.reentrant = originalReentrant;
654        // TODO: "Abort the processing of any nested invokations of the tokeniser,
655        // yielding control back to the caller." (<script> parsing).  Do we need
656        // to do something here?
657    
658      // 5. Return      // 5. Return
659      log ('document.write: return');      log ('document.write: return');
660    
661        logIndentLevel--;
662      return;      return;
663    }; // document.write    }; // document.write
664    
665      JSDocument.prototype._insertExternalScript = function (uri) {
666        var s = new JSElement (this, 'script');
667        s.src = uri;
668        this.documentElement.appendChild (s);
669      }; // _insertExternalScript
670    
671      JSDocument.prototype.__defineGetter__ ('documentElement', function () {
672        var cn = this.childNodes;
673        for (var i = 0; i < cn.length; i++) {
674          if (cn[i] instanceof JSElement) {
675            return cn[i]
676          }
677        }
678        return null;
679      });
680    
681    JSElement.prototype.__defineGetter__ ('text', function () {    JSElement.prototype.__defineGetter__ ('text', function () {
682      var r = '';      var r = '';
683      for (var i = 0; i < this.childNodes.length; i++) {      for (var i = 0; i < this.childNodes.length; i++) {
# Line 400  Line 694 
694        var node = n.childNodes[i];        var node = n.childNodes[i];
695        if (node instanceof JSElement) {        if (node instanceof JSElement) {
696          r += '| ' + indent + node.localName + '\n';          r += '| ' + indent + node.localName + '\n';
697            if (node.async) r += '| ' + indent + '  async=""\n';
698            if (node.defer) r += '| ' + indent + '  defer=""\n';
699            if (node.src != null) {
700              r += '| ' + indent + '  src="' + node.src + '"\n';
701            }
702          r += dumpTree (node, indent + '  ');          r += dumpTree (node, indent + '  ');
703        } else if (node instanceof JSText) {        } else if (node instanceof JSText) {
704          r += '| ' + indent + '"' + node.data + '"\n';          r += '| ' + indent + '"' + node.data + '"\n';
# Line 413  Line 712 
712  </head>  </head>
713  <body onload="  <body onload="
714    document.sourceElement = document.getElementsByTagName ('textarea')[0];    document.sourceElement = document.getElementsByTagName ('textarea')[0];
715    
716      var q = location.search;
717      if (q != null) {
718        q = q.substring (1).split (/;/);
719        for (var i = 0; i < q.length; i++) {
720          var v = q[i].split (/=/, 2);
721          v[0] = decodeURIComponent (v[0]);
722          v[1] = decodeURIComponent (v[1] || '');
723          if (v[0] == 's') {
724            document.sourceElement.value = v[1];
725          }
726        }
727      }
728    
729    document.logElement = document.getElementsByTagName ('output')[0];    document.logElement = document.getElementsByTagName ('output')[0];
730    update ();    update ();
731  ">  ">
732    <h1>Live Scripting <abbr title="Hypertext Markup Language">HTML</abbr>
733    Parser</h1>
734    
735  <textarea onchange=" update () ">&lt;html>  <h2>Markup to test
736    (<a href=data:, id=permalink rel=bookmark>permalink</a>,
737    <a href="http://software.hixie.ch/utilities/js/live-dom-viewer/"
738        id=ldvlink>Live <abbr title="Document Object Model">DOM</abbr>
739        Viewer</a>)</h2>
740    <p>
741    <textarea onkeydown=" update () " onchange=" update () " oninput=" update () ">&lt;html>
742  &lt;head>&lt;/head>&lt;body>  &lt;head>&lt;/head>&lt;body>
743  &lt;p>  &lt;p>
744  &lt;script>  &lt;script>
# Line 426  document.write ('aaaaaaa&lt;/p>&lt;scrip Line 747  document.write ('aaaaaaa&lt;/p>&lt;scrip
747  &lt;p>  &lt;p>
748  </textarea>  </textarea>
749    
750  <output></output>  <h2 id=log>Log</h2>
751    <p><output></output>
752    
753    <h2 id=notes>Notes</h2>
754    
755    <p>This is a <em>simplified</em> implementation of
756    <a href="http://www.whatwg.org/specs/web-apps/current-work/#parsing">HTML5
757    Parsing Algorithm</a>.  It only implements script-related part of the
758    algorithm.  Especially, this parser:
759    <ul>
760    <li>Does not support <code>DOCTYPE</code> and comment tokens.
761    <li>Does not support entities except for <code>&amp;quot;</code>,
762    <code>&amp;apos;</code>, and <code>&amp;amp;</code> in <code>script</code>
763    <code>src</code> attribute value.
764    <li>Does not support omissions of start or end tags, the <abbr>AAA</abbr>
765    algorithm, and so on.
766    <li>Does not raise parse errors for invalid attribute specifications in start
767    or end tags.
768    <li>Does not support CDATA/PCDATA element other than <code>script</code>.
769    <li>Does not support <code>&lt;!--</code>..<code>--></code> parsing rule
770    in <code>script</code> element.
771    <li>Does not support foreign (SVG or MathML) elements.
772    <li>Only supports <code>script</code> <code>type</code>
773    <code>text/javascript</code>.  <code>type</code> and <code>language</code>
774    attributes are ignored.
775    <li>Only supports limited statements.  It must consist of zero or more
776    of statements looking similar to the following statements, possibly
777    introduced, followed, or separated by white space characters:
778      <ul>
779      <li><code>document.write ("<var>string</var>", ["<var>string</var>", ...]);</code>.
780      <li><code>var s = document.createElement ("script");
781                s.src = "<var>string</var>";
782                document.documentElement.appendChild (s);</code>
783      </ul>
784    Note that strings may be delimited by <code>'</code>s instead of
785    <code>"</code>s.
786    <li>Only supports <code>javascript:</code>
787    <abbr title="Uniform Resourace Identifiers">URI</abbr> scheme in the
788    <code>src</code> attribute of the <code>script</code> element.  In addition,
789    the <abbr title="Uniform Resource Identifiers">URI</abbr> must be conform to
790    the regular expression <code>^javascript:\s*(?:"[^"]*"|'[^']*')\s*$</code>.
791    <li>Only supports <code>\u<var>HHHH</var></code> escapes only in
792    <code>javascript:</code> URI.
793    </ul>
794    
795    <p>For some reason, this parser does not work in browsers that do
796    not support JavaScript 1.5.
797    
798    <!-- TODO: license -->
799    
800  </body>  </body>
801  </html>  </html>
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