/[suikacvs]/markup/html/scripting-parser/parser.html

Diff of /markup/html/scripting-parser/parser.html

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-revision 1.1 by wakaba,
Sun Apr 20 06:07:24 2008 UTC
+revision 1.2 by wakaba,
Sun Apr 20 07:48:00 2008 UTC
 Line 19
  <script>
    function update () {
      document.logElement.textContent = '';
-     var p = new Parser ();
+     var p = new Parser (new InputStream (document.sourceElement.value));
-     p.parse (new InputStream (document.sourceElement.value));
+     p.parse ();
      log (dumpTree (p.doc, ''));
    } // update
 Line 32
      this.s = s;
    } // InputStream
-   function Parser () {
+   function Parser (i) {
      this.parseMode = 'pcdata';
-     this.doc = new JSDocument ();
+     this.doc = new JSDocument (this);
      this.openElements = [this.doc];
+     this.in = i;
    } // Parser
-   Parser.prototype.getNextToken = function (i) {
+   Parser.prototype.getNextToken = function () {
+     var i = this.in;
      if (this.parseMode == 'script') {
        var token;
        i.s = i.s.replace (/^([\s\S]+?)<\/[Ss][Cc][Rr][Ii][Pp][Tt]>/,
-Line 79
+Line 81
      return {type: 'eof'};
    } // getNextToken
-   Parser.prototype.parse = function (i) {
+   Parser.prototype.parse = function () {
      log ('start parsing');
      while (true) {
-       var token = this.getNextToken (i);
+       var token = this.getNextToken ();
        log ('token: ' + token.type + ' "' + token.value + '"');
        if (token.type == 'start-tag') {
-         var el = new JSElement (token.value);
          if (token.value == 'script') {
+           // 1. Create an element for the token in the HTML namespace.
+           var el = new JSElement (this.doc, token.value);
+           // 2. Mark the element as being "parser-inserted".
+           el.manakaiParserInserted = true;
+           // 3. Switch the tokeniser's content model flag to the CDATA state.
            this.parseMode = 'script';
+           // 4.1. Collect all the character tokens.
            while (true) {
-             var token = this.getNextToken (i);
+             var token = this.getNextToken ();
              log ('token: ' + token.type + ' "' + token.value + '"');
              if (token.type == 'char') {
+               // 5. Append a single Text node to the script element node.
                el.manakaiAppendText (token.value);
+             // 4.2. Until it returns a token that is not a character token, or
+             // TODO: 4.3. Until it stops tokenising.
              } else if (token.type == 'eof' ||
                         (token.type == 'end-tag' && token.value == 'script')) {
+               // 6. Switched back to the PCDATA state.
                this.parseMode = 'pcdata';
+               // 7.1. If the next token is not an end tag token with ...
+               if (token.type != 'end-tag') {
+                 // 7.2. This is a parse error.
+                 log ('Parse error: no </' + 'script>');
+                 // 7.3. Mark the script element as "already executed".
+                 el.manakaiAlreadyExecuted = true;
+               } else {
+                 // 7.4. Ignore it.
+                 //
+               }
                break;
              }
            }
+           // 8.1. If the parser were originally created for the ...
+           if (this.fragmentParsingMode) {
+             // 8.2. Mark the script element as "already executed" and ...
+             el.alreadyExecuted = true;
+             continue;
+           }
+           // 9.1. Let the old insertion point have the same value as the ...
+           // 9.2. Let the insertion point be just before the next input ...
+           // 10. Append the new element to the current node.
            this.openElements[this.openElements.length - 1].appendChild (el);
+           // 11. Let the insertion point have the value of the old ...
+           // 12. If there is a script that will execute as soon as ...
          } else {
+           var el = new JSElement (this.doc, token.value);
            this.openElements[this.openElements.length - 1].appendChild (el);
            this.openElements.push (el);
          }
-Line 124
+Line 169
      log ('stop parsing');
    } // parse
-   function JSDocument () {
+   function JSDocument (p) {
      this.childNodes = [];
+     this._parser = p;
    } // JSDocument
-   function JSElement (localName) {
+   function JSElement (doc, localName) {
      this.localName = localName;
+     this.ownerDocument = doc;
      this.childNodes = [];
    } // JSElement
-Line 137
+Line 184
    function (e) {
      this.childNodes.push (e);
      e.parentNode = this;
+     if (e.localName == 'script') {
+       log ('start running a script');
+       var doc = this.ownerDocument;
+       var p = doc._parser;
+       // 1. Script type
+       //
+       // 2.1. If scripting is disabled
+       //
+       // 2.2. If the script element was created by an XML ... innerHTML ...
+       //
+       // 2.3. If the user agent does not support the scripting language ...
+       //
+       // 2.4. If the script element has its "already executed" flag set
+       if (e.manakaiAlreadyExecuted) {
+         // 2.5. Abort these steps at this point.
+         log ('running a script: aborted');
+         return e;
+       }
+       // 3. Set the element's "already executed" flag.
+       e.manakaiAlreadyExecuted = true;
+       // 4. If the element has a src attribute, then a load for ...
+       // TODO: load an external resource
+       // 5. The first of the following options:
+       // 5.1.
+       if (/* TODO: If the document is still being parsed && */
+           e.defer && !e.async) {
+         // TODO
+       } else if (e.async && e.src != null) {
+         // TODO
+       } else if (e.async && e.src == null
+                  /* && list of scripts that will execute asynchronously is not empty */) {
+         // TODO
+       } else if (e.src != null && e.manakaiParserInserted) {
+         // TODO
+       } else if (e.src != null) {
+         // TODO
+       } else {
+         executeScript (doc, e); // even if other scripts are already executing.
+       }
+       log ('end running a script');
+     }
      return e;
    }; // appendChild
+   function executeScript (doc, e) {
+     log ('executing a script block: start');
+     // If the load resulted in an error, then ... firing an error event ...
+     // If the load was successful
+     log ('load event fired at the script element');
+     if (true) {
+     // Scripting is enabled, Document.designMode is disabled,
+     // Document is the active document in its browsing context
+       var s;
+       if (e.src != null) {
+         // TODO: from external file
+       } else {
+         s = e.text;
+       }
+       parseAndRunScript (doc, s);
+     }
+     log ('executing a script block: end');
+   } // executeScript
+   function parseAndRunScript (doc, s) {
+     while (true) {
+       var matched = false;
+       s = s.replace (/^\s*document\.write\s*\(((?:'[^']*'|"[^"]*")\s*(?:,\s*(?:'[^']*'|"[^"]*"))*)\)\s*;\s*/, function (s, t) {
+         matched = true;
+         var args = [];
+         t.replace (/('[^']*'|"[^"]*")/g, function (s, v) {
+           args.push (v.substring (1, v.length - 1));
+           return '';
+         });
+         doc.write.apply (doc, args);
+         return '';
+       });
+       if (s == '') break;
+       if (!matched) {
+         log ('Script parse error: "' + s + '"');
+         break;
+       }
+     }
+   } // parseAndRunScript
    function JSText (data) {
      this.data = data;
    } // JSText
-Line 155
+Line 299
      }
    }; // manakaiAppendText
+   JSDocument.prototype.write = function () {
+     // 1. If the insertion point is undefined, the open() method must be ...
+     //
+     // 2. ... inserted into the input stream just before the insertion point.
+     log ('document.write: insert "' + Array.join (arguments, '') + '"');
+     // 3. If there is a script that will execute as soon as the parser resumes
+     // TODO
+     // 4. Process the characters that were inserted, ...
+     // 5. Return
+     log ('document.write: return');
+     return;
+   }; // document.write
+   JSElement.prototype.__defineGetter__ ('text', function () {
+     var r = '';
+     for (var i = 0; i < this.childNodes.length; i++) {
+       if (this.childNodes[i] instanceof JSText) {
+         r += this.childNodes[i].data;
+       }
+     }
+     return r;
+   });
    function dumpTree (n, indent) {
      var r = '';
      for (var i = 0; i < n.childNodes.length; i++) {

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