html/scripting-parser/parser.html

<!DOCTYPE HTML>
<html lang=en>
<head>
<title>Demo of HTML5 Parsing Algorithm with Scripting Enabled</title>
<style>
  textarea {
     display: block;
     width: 80%;
     margin-left: auto;
     margin-right: auto;
     min-height: 20em;
  }
  output {
    display: block;
    font-family: monospace;
    white-space: -moz-pre-wrap;
    white-space: pre-wrap;
  }
</style>
<script>
  function update () {
    document.logElement.textContent = '';
    var p = new Parser (new InputStream (document.sourceElement.value));
    var doc = p.doc;
    p.parse ();
    log (dumpTree (doc, ''));
  } // update

  function log (s) {
    document.logElement.appendChild (document.createTextNode (s + "\n"));
  } // log

  function InputStream (s) {
    this.s = s;
  } // InputStream

  function Parser (i, doc) {
    this.parseMode = 'pcdata';
    if (!doc) {
      doc = new JSDocument (this);
      doc.manakaiIsHTML = true;
    }
    this.doc = doc;
    this.openElements = [doc];
    this.in = i;
    this.scriptsExecutedAfterParsing = [];
  } // Parser

  Parser.prototype.getNextToken = function () {
    var p = this;
    var i = this.in;
    if (this.parseMode == 'script') {
      var token;
      if (p.insertionPoint <= 0) {
        return {type: 'abort'};
      }
      i.s = i.s.replace (/^([^<]+)/,
      function (s, t) {
        if (0 < p.insertionPoint && p.insertionPoint < t.length) {
          token = {type: 'char', value: t.substring (0, p.insertionPoint)};
          var ip = p.insertionPoint;
          p.insertionPoint = 0;
          return t.substring (ip, t.length);
        }
        token = {type: 'char', value: t};
        p.insertionPoint -= t.length;
        return '';
      });
      if (token) return token;
      i.s = i.s.replace (/^<\/[Ss][Cc][Rr][Ii][Pp][Tt]>/, function (s) {
        if (p.insertionPoint < s.length) {
          token = {type: 'abort'};
          return s;
        }
        token = {type: 'end-tag', value: 'script'};
        p.insertionPoint -= s.length;
        return '';
      });
      if (token) return token;
      i.s = i.s.replace (/^</,
      function (s) {
        token = {type: 'char', value: s};
        p.insertionPoint -= s.length;
        return '';
      });
      if (token) return token;
      return {type: 'eof'};
    }

    var token;
    i.s = i.s.replace (/^<\/([^>]+)>/, function (s, e) {
      if (p.insertionPoint < s.length) {
        token = {type: 'abort'};
        return s;
      }
      token = {type: 'end-tag', value: e.toLowerCase ()};
      p.insertionPoint -= s.length;
      return '';
    });
    if (token) return token;
    i.s = i.s.replace (/^<([^>]+)>/, function (s, e) {
      if (p.insertionPoint < s.length) {
        token = {type: 'abort'};
        return s;
      }
      var tagName;
      var attrs = {};
      e = e.replace (/^[\S]+/, function (v) {
        tagName = v.toLowerCase ();
        return '';
      });
      e = e.replace (/^\s*(\S+)\s*(?:=\s*"([^"]*)"|'([^']*)'|([^"']+))?/,
      function (x, attrName, attrValue1, attrValue2, attrValue3) {
        attrs[attrName] = attrValue1 || attrValue2 || attrValue3;
        return '';
      });
      token = {type: 'start-tag', value: tagName, attrs: attrs};
      p.insertionPoint -= s.length;
      return '';
    });
    if (token) return token;
    if (p.insertionPoint <= 0) {
      return {type: 'abort'};
    }
    i.s = i.s.replace (/^[^<]+/, function (s) {
      if (p.insertionPoint < s.length) {
        token = {type: 'char', value: s.substring (0, p.insertionPoint)};
        var ip = p.insertionPoint;
        p.insertionPoint = 0;
        return s.substring (ip, s.length);
      }
      token = {type: 'char', value: s};
      p.insertionPoint -= s.length;
      return '';
    });
    if (token) return token;
    i.s = i.s.replace (/^[\s\S]/, function (s) {
      token = {type: 'char', value: s};
      p.insertionPoint -= s.length;
      return '';
    });
    if (token) return token;
    return {type: 'eof'};
  } // getNextToken

  Parser.prototype.parse = function () {
    log ('start parsing');

    while (true) {
      var token = this.getNextToken ();
      log ('token: ' + token.type + ' "' + token.value + '"');

      if (token.type == 'start-tag') {
        if (token.value == 'script') {
          // 1. Create an element for the token in the HTML namespace.
          var el = new JSElement (this.doc, token.value);
          if (token.attrs.async != null) el.async = true;
          if (token.attrs.defer != null) el.defer = true;
          if (token.attrs.src != null) el.src = token.attrs.src;

          // 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 ();
            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
            // until it stops tokenising.
            } else if (token.type == 'eof' ||
                       (token.type == 'end-tag' && token.value == 'script') ||
                       token.type == 'abort') {
              // 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 ...
          var oldInsertionPoint = this.insertionPoint;
          // 9.2. Let the insertion point be just before the next input ...
          this.setInsertionPoint (0);

          // 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 ...
          this.setInsertionPoint (oldInsertionPoint);

          // 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);
        }
      } else if (token.type == 'end-tag') {
        if (this.openElements[this.openElements.length - 1].localName ==
            token.value) {
          this.openElements.pop ();
        } else {
          log ('parse error: unmatched end tag: ' + token.value);
        }
      } else if (token.type == 'char') {
        this.openElements[this.openElements.length - 1].manakaiAppendText
            (token.value);
      } else if (token.type == 'eof') {
        break;
      } else if (token.type == 'abort') {
        log ('parse: abort');
        return;
      }
    }

    log ('stop parsing');

    // readyState = 'interactive'

    // "When a script completes loading" rules start applying.

    // TODO: Handles "list of scripts that will execute as soon as possible"
    // and "list of scripts that will execute asynchronously"

    // Handle "list of scripts that will execute when the document has finished
    // parsing".
    var list = this.scriptsExecutedAfterParsing;
    while (list.length > 0) {
      // TODO: break unless completed loading

      // Step 1.
      //

      // Step 2. and Step 3.
      log ('Executing a |defer|red script...');
      executeScript (this.doc, list.shift ());

      // Step 4.
    }

    log ('DOMContentLoaded event fired');

    // "delays tha load event" things has completed:
    // readyState = 'complete'
    log ('load event fired');
  } // parse

  Parser.prototype.setInsertionPoint = function (ip) {
    if (ip == undefined || ip == null || isNaN (ip)) {
      log ('insertion point: set to undefined');
      this.insertionPoint = undefined;
    } else if (ip == this.in.s.length) {
      log ('insertion point: end of file');
      this.insertionPoint = ip;
    } else {
      log ('insertion point: set to ' + ip +
           ' (before "' + this.in.s.substring (0, 10) + '")');
      this.insertionPoint = ip;
    }
  }; // setInsertionPoint

  function JSDocument (p) {
    this.childNodes = [];
    this._parser = p;
  } // JSDocument

  function JSElement (doc, localName) {
    this.localName = localName;
    this.ownerDocument = doc;
    this.childNodes = [];
  } // JSElement

  JSDocument.prototype.appendChild = JSElement.prototype.appendChild =
  function (e) {
    this.childNodes.push (e);
    e.parentNode = this;

    if (e.localName == 'script') {
      log ('Running a script: start');

      var doc = this.ownerDocument || this;
      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) {
        p.scriptsExecutedAfterParsing.push (e);
        log ('Running a script: aborted (defer)');
      } 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 ('Running a script: end');
    }

    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

  JSDocument.prototype.manakaiAppendText =
  JSElement.prototype.manakaiAppendText =
  function (s) {
    if (this.childNodes.length > 0 &&
        this.childNodes[this.childNodes.length - 1] instanceof JSText) {
      this.childNodes[this.childNodes.length - 1].data += s;
    } else {
      this.childNodes.push (new JSText (s));
    }
  }; // manakaiAppendText

  JSDocument.prototype.open = function () {
    // Two or fewer arguments

    // Step 1.
    var type = arguments[0] || 'text/html';
    
    // Step 2.
    var replace = arguments[1] == 'replace';

    // Step 3.
    if (this._parser &&
        !this._parser.scriptCreated &&
        this._parser.in.insertionPoint != undefined) {
      log ('document.open () in parsing mode is ignored');
      return this;
    }

    // Step 4.
    log ('onbeforeunload event fired');
    log ('onunload event fired');

    // Step 5.
    if (this._parser) {
      // Discard the parser.
    }

    // Step 6.
    log ('document cleared by document.open ()');
    this.childNodes = [];

    // Step 7.
    this._parser = new Parser (new InputStream (''), this);
    this._parser.scriptCreated = true;

    // Step 8.
    this.manakaiIsHTML = true;

    // Step 9.
    // If not text/html, ...

    // Step 10.
    if (!replace) {
      // History      
    }

    // Step 11.
    this._parser.setInsertionPoint (this._parser.in.s.length);

    // Step 12.
    return this;
  }; // document.open

  JSDocument.prototype.write = function () {
    var p = this._parser;

    // 1. If the insertion point is undefined, the open() method must be ...
    if (isNaN (p.insertionPoint) || p.insertionPoint == undefined) {
      this.open ();
      p = this._parser;
    }

    // 2. ... inserted into the input stream just before the insertion point.
    var s = Array.join (arguments, '');
    log ('document.write: insert "' + s + '"' +
         ' before "' + p.in.s.substring (p.insertionPoint, p.insertionPoint + 10) + '"');
    p.in.s = p.in.s.substring (0, p.insertionPoint) + s
        + p.in.s.substring (p.insertionPoint, p.in.s.length);
    p.insertionPoint += s.length;

    // 3. If there is a script that will execute as soon as the parser resumes
    // TODO

    // 4. Process the characters that were inserted, ...
    p.parse ();

    // 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++) {
      var node = n.childNodes[i];
      if (node instanceof JSElement) {
        r += '| ' + indent + node.localName + '\n';
        if (node.async) r += '| ' + indent + '  async=""\n';
        if (node.defer) r += '| ' + indent + '  defer=""\n';
        if (node.src) r += '| ' + indent + '  src="' + node.src + '"\n';
        r += dumpTree (node, indent + '  ');
      } else if (node instanceof JSText) {
        r += '| ' + indent + '"' + node.data + '"\n';
      } else {
        r += '| ' + indent + node + '\n';
      }
    }
    return r;
  } // dumpTree
</script>
</head>
<body onload="
  document.sourceElement = document.getElementsByTagName ('textarea')[0];
  document.logElement = document.getElementsByTagName ('output')[0];
  update ();
">

<textarea onchange=" update () ">&lt;html>
&lt;head>&lt;/head>&lt;body>
&lt;p>
&lt;script>
document.write ('aaaaaaa&lt;/p>&lt;script>document.write("cccccc");&lt;/', 'script>bbbbbb');
&lt;/script>
&lt;p>
</textarea>

<output></output>

</body>
</html>
1	<!DOCTYPE HTML>
2	<html lang=en>
3	<head>
4	<title>Demo of HTML5 Parsing Algorithm with Scripting Enabled</title>
5	<style>
6	textarea {
7	display: block;
8	width: 80%;
9	margin-left: auto;
10	margin-right: auto;
11	min-height: 20em;
12	}
13	output {
14	display: block;
15	font-family: monospace;
16	white-space: -moz-pre-wrap;
17	white-space: pre-wrap;
18	}
19	</style>
20	<script>
21	function update () {
22	document.logElement.textContent = '';
23	var p = new Parser (new InputStream (document.sourceElement.value));
24	var doc = p.doc;
25	p.parse ();
26	log (dumpTree (doc, ''));
27	} // update
28
29	function log (s) {
30	document.logElement.appendChild (document.createTextNode (s + "\n"));
31	} // log
32
33	function InputStream (s) {
34	this.s = s;
35	} // InputStream
36
37	function Parser (i, doc) {
38	this.parseMode = 'pcdata';
39	if (!doc) {
40	doc = new JSDocument (this);
41	doc.manakaiIsHTML = true;
42	}
43	this.doc = doc;
44	this.openElements = [doc];
45	this.in = i;
46	this.scriptsExecutedAfterParsing = [];
47	} // Parser
48
49	Parser.prototype.getNextToken = function () {
50	var p = this;
51	var i = this.in;
52	if (this.parseMode == 'script') {
53	var token;
54	if (p.insertionPoint <= 0) {
55	return {type: 'abort'};
56	}
57	i.s = i.s.replace (/^([^<]+)/,
58	function (s, t) {
59	if (0 < p.insertionPoint && p.insertionPoint < t.length) {
60	token = {type: 'char', value: t.substring (0, p.insertionPoint)};
61	var ip = p.insertionPoint;
62	p.insertionPoint = 0;
63	return t.substring (ip, t.length);
64	}
65	token = {type: 'char', value: t};
66	p.insertionPoint -= t.length;
67	return '';
68	});
69	if (token) return token;
70	i.s = i.s.replace (/^<\/[Ss][Cc][Rr][Ii][Pp][Tt]>/, function (s) {
71	if (p.insertionPoint < s.length) {
72	token = {type: 'abort'};
73	return s;
74	}
75	token = {type: 'end-tag', value: 'script'};
76	p.insertionPoint -= s.length;
77	return '';
78	});
79	if (token) return token;
80	i.s = i.s.replace (/^</,
81	function (s) {
82	token = {type: 'char', value: s};
83	p.insertionPoint -= s.length;
84	return '';
85	});
86	if (token) return token;
87	return {type: 'eof'};
88	}
89
90	var token;
91	i.s = i.s.replace (/^<\/([^>]+)>/, function (s, e) {
92	if (p.insertionPoint < s.length) {
93	token = {type: 'abort'};
94	return s;
95	}
96	token = {type: 'end-tag', value: e.toLowerCase ()};
97	p.insertionPoint -= s.length;
98	return '';
99	});
100	if (token) return token;
101	i.s = i.s.replace (/^<([^>]+)>/, function (s, e) {
102	if (p.insertionPoint < s.length) {
103	token = {type: 'abort'};
104	return s;
105	}
106	var tagName;
107	var attrs = {};
108	e = e.replace (/^[\S]+/, function (v) {
109	tagName = v.toLowerCase ();
110	return '';
111	});
112	e = e.replace (/^\s(\S+)\s(?:=\s"([^"])"\|'([^']*)'\|([^"']+))?/,
113	function (x, attrName, attrValue1, attrValue2, attrValue3) {
114	attrs[attrName] = attrValue1 \|\| attrValue2 \|\| attrValue3;
115	return '';
116	});
117	token = {type: 'start-tag', value: tagName, attrs: attrs};
118	p.insertionPoint -= s.length;
119	return '';
120	});
121	if (token) return token;
122	if (p.insertionPoint <= 0) {
123	return {type: 'abort'};
124	}
125	i.s = i.s.replace (/^[^<]+/, function (s) {
126	if (p.insertionPoint < s.length) {
127	token = {type: 'char', value: s.substring (0, p.insertionPoint)};
128	var ip = p.insertionPoint;
129	p.insertionPoint = 0;
130	return s.substring (ip, s.length);
131	}
132	token = {type: 'char', value: s};
133	p.insertionPoint -= s.length;
134	return '';
135	});
136	if (token) return token;
137	i.s = i.s.replace (/^[\s\S]/, function (s) {
138	token = {type: 'char', value: s};
139	p.insertionPoint -= s.length;
140	return '';
141	});
142	if (token) return token;
143	return {type: 'eof'};
144	} // getNextToken
145
146	Parser.prototype.parse = function () {
147	log ('start parsing');
148
149	while (true) {
150	var token = this.getNextToken ();
151	log ('token: ' + token.type + ' "' + token.value + '"');
152
153	if (token.type == 'start-tag') {
154	if (token.value == 'script') {
155	// 1. Create an element for the token in the HTML namespace.
156	var el = new JSElement (this.doc, token.value);
157	if (token.attrs.async != null) el.async = true;
158	if (token.attrs.defer != null) el.defer = true;
159	if (token.attrs.src != null) el.src = token.attrs.src;
160
161	// 2. Mark the element as being "parser-inserted".
162	el.manakaiParserInserted = true;
163
164	// 3. Switch the tokeniser's content model flag to the CDATA state.
165	this.parseMode = 'script';
166
167	// 4.1. Collect all the character tokens.
168	while (true) {
169	var token = this.getNextToken ();
170	log ('token: ' + token.type + ' "' + token.value + '"');
171
172	if (token.type == 'char') {
173	// 5. Append a single Text node to the script element node.
174	el.manakaiAppendText (token.value);
175
176	// 4.2. Until it returns a token that is not a character token, or
177	// until it stops tokenising.
178	} else if (token.type == 'eof' \|\|
179	(token.type == 'end-tag' && token.value == 'script') \|\|
180	token.type == 'abort') {
181	// 6. Switched back to the PCDATA state.
182	this.parseMode = 'pcdata';
183
184	// 7.1. If the next token is not an end tag token with ...
185	if (token.type != 'end-tag') {
186	// 7.2. This is a parse error.
187	log ('Parse error: no </' + 'script>');
188
189	// 7.3. Mark the script element as "already executed".
190	el.manakaiAlreadyExecuted = true;
191	} else {
192	// 7.4. Ignore it.
193	//
194	}
195	break;
196	}
197	}
198
199	// 8.1. If the parser were originally created for the ...
200	if (this.fragmentParsingMode) {
201	// 8.2. Mark the script element as "already executed" and ...
202	el.alreadyExecuted = true;
203	continue;
204	}
205
206	// 9.1. Let the old insertion point have the same value as the ...
207	var oldInsertionPoint = this.insertionPoint;
208	// 9.2. Let the insertion point be just before the next input ...
209	this.setInsertionPoint (0);
210
211	// 10. Append the new element to the current node.
212	this.openElements[this.openElements.length - 1].appendChild (el);
213
214	// 11. Let the insertion point have the value of the old ...
215	this.setInsertionPoint (oldInsertionPoint);
216
217	// 12. If there is a script that will execute as soon as ...
218
219
220	} else {
221	var el = new JSElement (this.doc, token.value);
222	this.openElements[this.openElements.length - 1].appendChild (el);
223	this.openElements.push (el);
224	}
225	} else if (token.type == 'end-tag') {
226	if (this.openElements[this.openElements.length - 1].localName ==
227	token.value) {
228	this.openElements.pop ();
229	} else {
230	log ('parse error: unmatched end tag: ' + token.value);
231	}
232	} else if (token.type == 'char') {
233	this.openElements[this.openElements.length - 1].manakaiAppendText
234	(token.value);
235	} else if (token.type == 'eof') {
236	break;
237	} else if (token.type == 'abort') {
238	log ('parse: abort');
239	return;
240	}
241	}
242
243	log ('stop parsing');
244
245	// readyState = 'interactive'
246
247	// "When a script completes loading" rules start applying.
248
249	// TODO: Handles "list of scripts that will execute as soon as possible"
250	// and "list of scripts that will execute asynchronously"
251
252	// Handle "list of scripts that will execute when the document has finished
253	// parsing".
254	var list = this.scriptsExecutedAfterParsing;
255	while (list.length > 0) {
256	// TODO: break unless completed loading
257
258	// Step 1.
259	//
260
261	// Step 2. and Step 3.
262	log ('Executing a \|defer\|red script...');
263	executeScript (this.doc, list.shift ());
264
265	// Step 4.
266	}
267
268	log ('DOMContentLoaded event fired');
269
270	// "delays tha load event" things has completed:
271	// readyState = 'complete'
272	log ('load event fired');
273	} // parse
274
275	Parser.prototype.setInsertionPoint = function (ip) {
276	if (ip == undefined \|\| ip == null \|\| isNaN (ip)) {
277	log ('insertion point: set to undefined');
278	this.insertionPoint = undefined;
279	} else if (ip == this.in.s.length) {
280	log ('insertion point: end of file');
281	this.insertionPoint = ip;
282	} else {
283	log ('insertion point: set to ' + ip +
284	' (before "' + this.in.s.substring (0, 10) + '")');
285	this.insertionPoint = ip;
286	}
287	}; // setInsertionPoint
288
289	function JSDocument (p) {
290	this.childNodes = [];
291	this._parser = p;
292	} // JSDocument
293
294	function JSElement (doc, localName) {
295	this.localName = localName;
296	this.ownerDocument = doc;
297	this.childNodes = [];
298	} // JSElement
299
300	JSDocument.prototype.appendChild = JSElement.prototype.appendChild =
301	function (e) {
302	this.childNodes.push (e);
303	e.parentNode = this;
304
305	if (e.localName == 'script') {
306	log ('Running a script: start');
307
308	var doc = this.ownerDocument \|\| this;
309	var p = doc._parser;
310
311	// 1. Script type
312	//
313
314	// 2.1. If scripting is disabled
315	//
316	// 2.2. If the script element was created by an XML ... innerHTML ...
317	//
318	// 2.3. If the user agent does not support the scripting language ...
319	//
320	// 2.4. If the script element has its "already executed" flag set
321	if (e.manakaiAlreadyExecuted) {
322	// 2.5. Abort these steps at this point.
323	log ('Running a script: aborted');
324	return e;
325	}
326
327	// 3. Set the element's "already executed" flag.
328	e.manakaiAlreadyExecuted = true;
329
330	// 4. If the element has a src attribute, then a load for ...
331	// TODO: load an external resource
332
333	// 5. The first of the following options:
334
335	// 5.1.
336	if (/* TODO: If the document is still being parsed && */
337	e.defer && !e.async) {
338	p.scriptsExecutedAfterParsing.push (e);
339	log ('Running a script: aborted (defer)');
340	} else if (e.async && e.src != null) {
341	// TODO
342	} else if (e.async && e.src == null
343	/* && list of scripts that will execute asynchronously is not empty */) {
344	// TODO
345	} else if (e.src != null && e.manakaiParserInserted) {
346	// TODO
347	} else if (e.src != null) {
348	// TODO
349	} else {
350	executeScript (doc, e); // even if other scripts are already executing.
351	}
352
353	log ('Running a script: end');
354	}
355
356	return e;
357	}; // appendChild
358
359	function executeScript (doc, e) {
360	log ('executing a script block: start');
361
362	// If the load resulted in an error, then ... firing an error event ...
363
364	// If the load was successful
365	log ('load event fired at the script element');
366
367	if (true) {
368	// Scripting is enabled, Document.designMode is disabled,
369	// Document is the active document in its browsing context
370
371	var s;
372	if (e.src != null) {
373	// TODO: from external file
374	} else {
375	s = e.text;
376	}
377
378	parseAndRunScript (doc, s);
379	}
380
381	log ('executing a script block: end');
382	} // executeScript
383
384	function parseAndRunScript (doc, s) {
385	while (true) {
386	var matched = false;
387	s = s.replace (/^\sdocument\.write\s\(((?:'[^']'\|"[^"]")\s(?:,\s(?:'[^']'\|"[^"]")))\)\s;\s*/, function (s, t) {
388	matched = true;
389	var args = [];
390	t.replace (/('[^']'\|"[^"]")/g, function (s, v) {
391	args.push (v.substring (1, v.length - 1));
392	return '';
393	});
394	doc.write.apply (doc, args);
395	return '';
396	});
397	if (s == '') break;
398	if (!matched) {
399	log ('Script parse error: "' + s + '"');
400	break;
401	}
402	}
403	} // parseAndRunScript
404
405	function JSText (data) {
406	this.data = data;
407	} // JSText
408
409	JSDocument.prototype.manakaiAppendText =
410	JSElement.prototype.manakaiAppendText =
411	function (s) {
412	if (this.childNodes.length > 0 &&
413	this.childNodes[this.childNodes.length - 1] instanceof JSText) {
414	this.childNodes[this.childNodes.length - 1].data += s;
415	} else {
416	this.childNodes.push (new JSText (s));
417	}
418	}; // manakaiAppendText
419
420	JSDocument.prototype.open = function () {
421	// Two or fewer arguments
422
423	// Step 1.
424	var type = arguments[0] \|\| 'text/html';
425
426	// Step 2.
427	var replace = arguments[1] == 'replace';
428
429	// Step 3.
430	if (this._parser &&
431	!this._parser.scriptCreated &&
432	this._parser.in.insertionPoint != undefined) {
433	log ('document.open () in parsing mode is ignored');
434	return this;
435	}
436
437	// Step 4.
438	log ('onbeforeunload event fired');
439	log ('onunload event fired');
440
441	// Step 5.
442	if (this._parser) {
443	// Discard the parser.
444	}
445
446	// Step 6.
447	log ('document cleared by document.open ()');
448	this.childNodes = [];
449
450	// Step 7.
451	this._parser = new Parser (new InputStream (''), this);
452	this._parser.scriptCreated = true;
453
454	// Step 8.
455	this.manakaiIsHTML = true;
456
457	// Step 9.
458	// If not text/html, ...
459
460	// Step 10.
461	if (!replace) {
462	// History
463	}
464
465	// Step 11.
466	this._parser.setInsertionPoint (this._parser.in.s.length);
467
468	// Step 12.
469	return this;
470	}; // document.open
471
472	JSDocument.prototype.write = function () {
473	var p = this._parser;
474
475	// 1. If the insertion point is undefined, the open() method must be ...
476	if (isNaN (p.insertionPoint) \|\| p.insertionPoint == undefined) {
477	this.open ();
478	p = this._parser;
479	}
480
481	// 2. ... inserted into the input stream just before the insertion point.
482	var s = Array.join (arguments, '');
483	log ('document.write: insert "' + s + '"' +
484	' before "' + p.in.s.substring (p.insertionPoint, p.insertionPoint + 10) + '"');
485	p.in.s = p.in.s.substring (0, p.insertionPoint) + s
486	+ p.in.s.substring (p.insertionPoint, p.in.s.length);
487	p.insertionPoint += s.length;
488
489	// 3. If there is a script that will execute as soon as the parser resumes
490	// TODO
491
492	// 4. Process the characters that were inserted, ...
493	p.parse ();
494
495	// 5. Return
496	log ('document.write: return');
497	return;
498	}; // document.write
499
500	JSElement.prototype.__defineGetter__ ('text', function () {
501	var r = '';
502	for (var i = 0; i < this.childNodes.length; i++) {
503	if (this.childNodes[i] instanceof JSText) {
504	r += this.childNodes[i].data;
505	}
506	}
507	return r;
508	});
509
510	function dumpTree (n, indent) {
511	var r = '';
512	for (var i = 0; i < n.childNodes.length; i++) {
513	var node = n.childNodes[i];
514	if (node instanceof JSElement) {
515	r += '\| ' + indent + node.localName + '\n';
516	if (node.async) r += '\| ' + indent + ' async=""\n';
517	if (node.defer) r += '\| ' + indent + ' defer=""\n';
518	if (node.src) r += '\| ' + indent + ' src="' + node.src + '"\n';
519	r += dumpTree (node, indent + ' ');
520	} else if (node instanceof JSText) {
521	r += '\| ' + indent + '"' + node.data + '"\n';
522	} else {
523	r += '\| ' + indent + node + '\n';
524	}
525	}
526	return r;
527	} // dumpTree
528	</script>
529	</head>
530	<body onload="
531	document.sourceElement = document.getElementsByTagName ('textarea')[0];
532	document.logElement = document.getElementsByTagName ('output')[0];
533	update ();
534	">
535
536	<textarea onchange=" update () "><html>
537	<head></head><body>
538	<p>
539	<script>
540	document.write ('aaaaaaa</p><script>document.write("cccccc");</', 'script>bbbbbb');
541	</script>
542	<p>
543	</textarea>
544
545	<output></output>
546
547	</body>
548	</html>