/[suikacvs]/markup/html/scripting-parser/parser.html
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revision 1.4 by wakaba, Sun Apr 20 12:19:13 2008 UTC revision 1.6 by wakaba, Fri Apr 25 13:42:51 2008 UTC
# Line 26  Line 26 
26      log (dumpTree (doc, ''));      log (dumpTree (doc, ''));
27    } // update    } // update
28    
29      var logIndentLevel = 0;
30    function log (s) {    function log (s) {
31        for (var i = 0; i < logIndentLevel; i++) {
32          s = '  ' + s;
33        }
34      document.logElement.appendChild (document.createTextNode (s + "\n"));      document.logElement.appendChild (document.createTextNode (s + "\n"));
35    } // log    } // log
36    
# Line 77  Line 81 
81          return '';          return '';
82        });        });
83        if (token) return token;        if (token) return token;
84          var m;
85          if ((p.insertionPoint < '</script'.length) &&
86              (m = i.s.match (/^<\/([SCRIPTscript]+)/))) {
87            var v = m[1].substring (0, p.insertionPoint).toLowerCase ();
88            if (v == 'script'.substring (0, p.insertionPoint - '</'.length)) {
89              return {type: 'abort'};
90            }
91          }
92        i.s = i.s.replace (/^</,        i.s = i.s.replace (/^</,
93        function (s) {        function (s) {
94          token = {type: 'char', value: s};          token = {type: 'char', value: s};
# Line 88  Line 100 
100      }      }
101    
102      var token;      var token;
103      i.s = i.s.replace (/^<\/([^>]+)>/, function (s, e) {      i.s = i.s.replace (/^<\/([^>]+)(?:>|$)/, function (s, e) {
104        if (p.insertionPoint < s.length) {        if (p.insertionPoint < s.length ||
105              (p.insertionPoint <= s.length &&
106               s.substring (s.length - 1, 1) != '>')) {
107          token = {type: 'abort'};          token = {type: 'abort'};
108          return s;          return s;
109        }        }
# Line 98  Line 112 
112        return '';        return '';
113      });      });
114      if (token) return token;      if (token) return token;
115      i.s = i.s.replace (/^<([^>]+)>/, function (s, e) {      i.s = i.s.replace (/^<([^>]+)(?:>|$)/, function (s, e) {
116        if (p.insertionPoint < s.length) {        if (p.insertionPoint < s.length ||
117              (p.insertionPoint <= s.length &&
118               s.substring (s.length - 1, 1) != '>')) {
119          token = {type: 'abort'};          token = {type: 'abort'};
120          return s;          return s;
121        }        }
# Line 109  Line 125 
125          tagName = v.toLowerCase ();          tagName = v.toLowerCase ();
126          return '';          return '';
127        });        });
128        e = e.replace (/^\s*(\S+)\s*(?:=\s*"([^"]*)"|'([^']*)'|([^"']+))?/,        e = e.replace (/^\s*([^\s=]+)\s*(?:=\s*(?:"([^"]*)"|'([^']*)'|([^"']+)))?/,
129        function (x, attrName, attrValue1, attrValue2, attrValue3) {        function (x, attrName, attrValue1, attrValue2, attrValue3) {
130          attrs[attrName] = attrValue1 || attrValue2 || attrValue3;          v = attrValue1 || attrValue2 || attrValue3;
131            v = v.replace (/&quot;/g, '"').replace (/&apos;/g, "'")
132                .replace (/&amp;/g, '&');
133            attrs[attrName.toLowerCase ()] = v;
134          return '';          return '';
135        });        });
136          if (e.length) {
137            log ('Broken start tag: "' + e + '"');
138          }
139        token = {type: 'start-tag', value: tagName, attrs: attrs};        token = {type: 'start-tag', value: tagName, attrs: attrs};
140        p.insertionPoint -= s.length;        p.insertionPoint -= s.length;
141        return '';        return '';
# Line 144  Line 166 
166    } // getNextToken    } // getNextToken
167    
168    Parser.prototype.parse = function () {    Parser.prototype.parse = function () {
169      log ('start parsing');      logIndentLevel++;
170        log ('parse: start');
171    
172      while (true) {      while (true) {
173        var token = this.getNextToken ();        var token = this.getNextToken ();
# Line 212  Line 235 
235            this.openElements[this.openElements.length - 1].appendChild (el);            this.openElements[this.openElements.length - 1].appendChild (el);
236    
237            // 11. Let the insertion point have the value of the old ...            // 11. Let the insertion point have the value of the old ...
238              oldInsertionPoint += this.insertionPoint;
239            this.setInsertionPoint (oldInsertionPoint);            this.setInsertionPoint (oldInsertionPoint);
240    
241            // 12. If there is a script that will execute as soon as ...            // 12. If there is a script that will execute as soon as ...
242                        while (this.scriptExecutedWhenParserResumes) {
243                // 12.1. If the tree construction stage is being called reentrantly
244                if (this.reentrant) {
245                  log ('parse: abort (reentrance)');
246                  logIndentLevel--;
247                  return;
248    
249                // 12.2. Otherwise
250                } else {
251                  // 1.
252                  var script = this.scriptExecutedWhenParserResumes;
253                  this.scriptExecutedWhenParserResumes = null;
254    
255                  // 2. Pause until the script has completed loading.
256                  //
257    
258                  // 3. Let the insertion point to just before the next input char.
259                  this.setInsertionPoint (0);
260    
261                  // 4. Execute the script.
262                  executeScript (this.doc, script);
263    
264                  // 5. Let the insertion point be undefined again.
265                  this.setInsertionPoint (undefined);
266    
267                  // 6. If there is once again a script that will execute ...
268                  //
269                }
270              }
271          } else {          } else {
272            var el = new JSElement (this.doc, token.value);            var el = new JSElement (this.doc, token.value);
273            this.openElements[this.openElements.length - 1].appendChild (el);            this.openElements[this.openElements.length - 1].appendChild (el);
# Line 236  Line 287 
287          break;          break;
288        } else if (token.type == 'abort') {        } else if (token.type == 'abort') {
289          log ('parse: abort');          log ('parse: abort');
290            logIndentLevel--;
291          return;          return;
292        }        }
293      }      }
# Line 270  Line 322 
322      // "delays tha load event" things has completed:      // "delays tha load event" things has completed:
323      // readyState = 'complete'      // readyState = 'complete'
324      log ('load event fired');      log ('load event fired');
325    
326        logIndentLevel--;
327    } // parse    } // parse
328    
329    Parser.prototype.setInsertionPoint = function (ip) {    Parser.prototype.setInsertionPoint = function (ip) {
# Line 303  Line 357 
357      e.parentNode = this;      e.parentNode = this;
358    
359      if (e.localName == 'script') {      if (e.localName == 'script') {
360          logIndentLevel++;
361        log ('Running a script: start');        log ('Running a script: start');
362    
363        var doc = this.ownerDocument || this;        var doc = this.ownerDocument || this;
# Line 321  Line 376 
376        if (e.manakaiAlreadyExecuted) {        if (e.manakaiAlreadyExecuted) {
377          // 2.5. Abort these steps at this point.          // 2.5. Abort these steps at this point.
378          log ('Running a script: aborted');          log ('Running a script: aborted');
379            logIndentLevel--;
380          return e;          return e;
381        }        }
382    
# Line 343  Line 399 
399                   /* && list of scripts that will execute asynchronously is not empty */) {                   /* && list of scripts that will execute asynchronously is not empty */) {
400          // TODO          // TODO
401        } else if (e.src != null && e.manakaiParserInserted) {        } else if (e.src != null && e.manakaiParserInserted) {
402          // TODO          if (p.scriptExecutedWhenParserResumes) {
403              log ('Error: There is a script that will execute as soon as the parser resumes.');
404            }
405            p.scriptExecutedWhenParserResumes = e;
406            log ('Running a script: aborted (src)');
407        } else if (e.src != null) {        } else if (e.src != null) {
408          // TODO          // TODO
409        } else {        } else {
# Line 351  Line 411 
411        }        }
412    
413        log ('Running a script: end');        log ('Running a script: end');
414          logIndentLevel--;
415      }      }
416    
417      return e;      return e;
# Line 359  Line 420 
420    function executeScript (doc, e) {    function executeScript (doc, e) {
421      log ('executing a script block: start');      log ('executing a script block: start');
422    
423      // If the load resulted in an error, then ... firing an error event ...      var s;
424        if (e.src != null) {
425          s = getExternalScript (e.src);
426    
427          // If the load resulted in an error, then ... firing an error event ...
428          if (s == null) {
429            log ('error event fired at the script element');
430            return;
431          }
432    
433          log ('External script loaded: "' + s + '"');
434        } else {
435          s = e.text;
436        }
437    
438      // If the load was successful      // If the load was successful
439      log ('load event fired at the script element');      log ('load event fired at the script element');
# Line 368  Line 442 
442      // Scripting is enabled, Document.designMode is disabled,      // Scripting is enabled, Document.designMode is disabled,
443      // Document is the active document in its browsing context      // Document is the active document in its browsing context
444    
       var s;  
       if (e.src != null) {  
         // TODO: from external file  
       } else {  
         s = e.text;  
       }  
   
445        parseAndRunScript (doc, s);        parseAndRunScript (doc, s);
446      }      }
447    
448      log ('executing a script block: end');      log ('executing a script block: end');
449    } // executeScript    } // executeScript
450    
451      function getExternalScript (uri) {
452        if (uri.match (/^javascript:/i)) {
453          var m;
454          if (m = uri.match (/^javascript:\s*(?:'([^']*)'|"([^"]+)")\s*$/i)) {
455            if (m[1]) {
456              return m[1];
457            } else if (m[2]) {
458              return m[2];
459            } else {
460              return null;
461            }
462          } else {
463            log ('Complex javascript: URI is not supported: <' + uri + '>');
464            return null;
465          }
466        } else {
467          log ('URI scheme not supported: <' + uri + '>');
468          return null;
469        }
470      } // getExternalScript
471    
472    function parseAndRunScript (doc, s) {    function parseAndRunScript (doc, s) {
473      while (true) {      while (true) {
474        var matched = false;        var matched = false;
# Line 470  Line 558 
558    }; // document.open    }; // document.open
559    
560    JSDocument.prototype.write = function () {    JSDocument.prototype.write = function () {
561        logIndentLevel++;
562    
563      var p = this._parser;      var p = this._parser;
564    
565      // 1. If the insertion point is undefined, the open() method must be ...      // 1. If the insertion point is undefined, the open() method must be ...
# Line 487  Line 577 
577      p.insertionPoint += s.length;      p.insertionPoint += s.length;
578    
579      // 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
580      // TODO      if (p.scriptExecutedAfterParserResumes) {
581          log ('document.write: processed later (there is an unprocessed <script src>)');
582          logIndentLevel--;
583          return;
584        }
585    
586      // 4. Process the characters that were inserted, ...      // 4. Process the characters that were inserted, ...
587        var originalReentrant = p.reentrant;
588        p.reentrant = true;
589      p.parse ();      p.parse ();
590        p.reentrant = originalReentrant;
591        // TODO: "Abort the processing of any nested invokations of the tokeniser,
592        // yielding control back to the caller." (<script> parsing).  Do we need
593        // to do something here?
594    
595      // 5. Return      // 5. Return
596      log ('document.write: return');      log ('document.write: return');
597    
598        logIndentLevel--;
599      return;      return;
600    }; // document.write    }; // document.write
601    
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