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;
      var m;
      if ((p.insertionPoint < '</script'.length) &&
          (m = i.s.match (/^<\/([SCRIPTscript]+)/))) {
        var v = m[1].substring (0, p.insertionPoint).toLowerCase ();
        if (v == 'script'.substring (0, p.insertionPoint - '</'.length)) {
          return {type: 'abort'};
        }
      }
      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 (/^<\/([^>]+)(?:>|$)/, function (s, e) {
      if (p.insertionPoint < s.length ||
          (p.insertionPoint <= s.length &&
           s.substring (s.length - 1, 1) != '>')) {
        token = {type: 'abort'};
        return s;
      }
      token = {type: 'end-tag', value: e.toLowerCase ()};
      p.insertionPoint -= s.length;
      return '';
    });
    if (token) return token;
    i.s = i.s.replace (/^<([^>]+)(?:>|$)/, function (s, e) {
      if (p.insertionPoint < s.length ||
          (p.insertionPoint <= s.length &&
           s.substring (s.length - 1, 1) != '>')) {
        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 ...
          oldInsertionPoint += this.insertionPoint;
          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	var m;
81	if ((p.insertionPoint < '</script'.length) &&
82	(m = i.s.match (/^<\/([SCRIPTscript]+)/))) {
83	var v = m[1].substring (0, p.insertionPoint).toLowerCase ();
84	if (v == 'script'.substring (0, p.insertionPoint - '</'.length)) {
85	return {type: 'abort'};
86	}
87	}
88	i.s = i.s.replace (/^</,
89	function (s) {
90	token = {type: 'char', value: s};
91	p.insertionPoint -= s.length;
92	return '';
93	});
94	if (token) return token;
95	return {type: 'eof'};
96	}
97
98	var token;
99	i.s = i.s.replace (/^<\/([^>]+)(?:>\|$)/, function (s, e) {
100	if (p.insertionPoint < s.length \|\|
101	(p.insertionPoint <= s.length &&
102	s.substring (s.length - 1, 1) != '>')) {
103	token = {type: 'abort'};
104	return s;
105	}
106	token = {type: 'end-tag', value: e.toLowerCase ()};
107	p.insertionPoint -= s.length;
108	return '';
109	});
110	if (token) return token;
111	i.s = i.s.replace (/^<([^>]+)(?:>\|$)/, function (s, e) {
112	if (p.insertionPoint < s.length \|\|
113	(p.insertionPoint <= s.length &&
114	s.substring (s.length - 1, 1) != '>')) {
115	token = {type: 'abort'};
116	return s;
117	}
118	var tagName;
119	var attrs = {};
120	e = e.replace (/^[\S]+/, function (v) {
121	tagName = v.toLowerCase ();
122	return '';
123	});
124	e = e.replace (/^\s(\S+)\s(?:=\s"([^"])"\|'([^']*)'\|([^"']+))?/,
125	function (x, attrName, attrValue1, attrValue2, attrValue3) {
126	attrs[attrName] = attrValue1 \|\| attrValue2 \|\| attrValue3;
127	return '';
128	});
129	token = {type: 'start-tag', value: tagName, attrs: attrs};
130	p.insertionPoint -= s.length;
131	return '';
132	});
133	if (token) return token;
134	if (p.insertionPoint <= 0) {
135	return {type: 'abort'};
136	}
137	i.s = i.s.replace (/^[^<]+/, function (s) {
138	if (p.insertionPoint < s.length) {
139	token = {type: 'char', value: s.substring (0, p.insertionPoint)};
140	var ip = p.insertionPoint;
141	p.insertionPoint = 0;
142	return s.substring (ip, s.length);
143	}
144	token = {type: 'char', value: s};
145	p.insertionPoint -= s.length;
146	return '';
147	});
148	if (token) return token;
149	i.s = i.s.replace (/^[\s\S]/, function (s) {
150	token = {type: 'char', value: s};
151	p.insertionPoint -= s.length;
152	return '';
153	});
154	if (token) return token;
155	return {type: 'eof'};
156	} // getNextToken
157
158	Parser.prototype.parse = function () {
159	log ('start parsing');
160
161	while (true) {
162	var token = this.getNextToken ();
163	log ('token: ' + token.type + ' "' + token.value + '"');
164
165	if (token.type == 'start-tag') {
166	if (token.value == 'script') {
167	// 1. Create an element for the token in the HTML namespace.
168	var el = new JSElement (this.doc, token.value);
169	if (token.attrs.async != null) el.async = true;
170	if (token.attrs.defer != null) el.defer = true;
171	if (token.attrs.src != null) el.src = token.attrs.src;
172
173	// 2. Mark the element as being "parser-inserted".
174	el.manakaiParserInserted = true;
175
176	// 3. Switch the tokeniser's content model flag to the CDATA state.
177	this.parseMode = 'script';
178
179	// 4.1. Collect all the character tokens.
180	while (true) {
181	var token = this.getNextToken ();
182	log ('token: ' + token.type + ' "' + token.value + '"');
183
184	if (token.type == 'char') {
185	// 5. Append a single Text node to the script element node.
186	el.manakaiAppendText (token.value);
187
188	// 4.2. Until it returns a token that is not a character token, or
189	// until it stops tokenising.
190	} else if (token.type == 'eof' \|\|
191	(token.type == 'end-tag' && token.value == 'script') \|\|
192	token.type == 'abort') {
193	// 6. Switched back to the PCDATA state.
194	this.parseMode = 'pcdata';
195
196	// 7.1. If the next token is not an end tag token with ...
197	if (token.type != 'end-tag') {
198	// 7.2. This is a parse error.
199	log ('Parse error: no </' + 'script>');
200
201	// 7.3. Mark the script element as "already executed".
202	el.manakaiAlreadyExecuted = true;
203	} else {
204	// 7.4. Ignore it.
205	//
206	}
207	break;
208	}
209	}
210
211	// 8.1. If the parser were originally created for the ...
212	if (this.fragmentParsingMode) {
213	// 8.2. Mark the script element as "already executed" and ...
214	el.alreadyExecuted = true;
215	continue;
216	}
217
218	// 9.1. Let the old insertion point have the same value as the ...
219	var oldInsertionPoint = this.insertionPoint;
220	// 9.2. Let the insertion point be just before the next input ...
221	this.setInsertionPoint (0);
222
223	// 10. Append the new element to the current node.
224	this.openElements[this.openElements.length - 1].appendChild (el);
225
226	// 11. Let the insertion point have the value of the old ...
227	oldInsertionPoint += this.insertionPoint;
228	this.setInsertionPoint (oldInsertionPoint);
229
230	// 12. If there is a script that will execute as soon as ...
231
232
233	} else {
234	var el = new JSElement (this.doc, token.value);
235	this.openElements[this.openElements.length - 1].appendChild (el);
236	this.openElements.push (el);
237	}
238	} else if (token.type == 'end-tag') {
239	if (this.openElements[this.openElements.length - 1].localName ==
240	token.value) {
241	this.openElements.pop ();
242	} else {
243	log ('parse error: unmatched end tag: ' + token.value);
244	}
245	} else if (token.type == 'char') {
246	this.openElements[this.openElements.length - 1].manakaiAppendText
247	(token.value);
248	} else if (token.type == 'eof') {
249	break;
250	} else if (token.type == 'abort') {
251	log ('parse: abort');
252	return;
253	}
254	}
255
256	log ('stop parsing');
257
258	// readyState = 'interactive'
259
260	// "When a script completes loading" rules start applying.
261
262	// TODO: Handles "list of scripts that will execute as soon as possible"
263	// and "list of scripts that will execute asynchronously"
264
265	// Handle "list of scripts that will execute when the document has finished
266	// parsing".
267	var list = this.scriptsExecutedAfterParsing;
268	while (list.length > 0) {
269	// TODO: break unless completed loading
270
271	// Step 1.
272	//
273
274	// Step 2. and Step 3.
275	log ('Executing a \|defer\|red script...');
276	executeScript (this.doc, list.shift ());
277
278	// Step 4.
279	}
280
281	log ('DOMContentLoaded event fired');
282
283	// "delays tha load event" things has completed:
284	// readyState = 'complete'
285	log ('load event fired');
286	} // parse
287
288	Parser.prototype.setInsertionPoint = function (ip) {
289	if (ip == undefined \|\| ip == null \|\| isNaN (ip)) {
290	log ('insertion point: set to undefined');
291	this.insertionPoint = undefined;
292	} else if (ip == this.in.s.length) {
293	log ('insertion point: end of file');
294	this.insertionPoint = ip;
295	} else {
296	log ('insertion point: set to ' + ip +
297	' (before "' + this.in.s.substring (0, 10) + '")');
298	this.insertionPoint = ip;
299	}
300	}; // setInsertionPoint
301
302	function JSDocument (p) {
303	this.childNodes = [];
304	this._parser = p;
305	} // JSDocument
306
307	function JSElement (doc, localName) {
308	this.localName = localName;
309	this.ownerDocument = doc;
310	this.childNodes = [];
311	} // JSElement
312
313	JSDocument.prototype.appendChild = JSElement.prototype.appendChild =
314	function (e) {
315	this.childNodes.push (e);
316	e.parentNode = this;
317
318	if (e.localName == 'script') {
319	log ('Running a script: start');
320
321	var doc = this.ownerDocument \|\| this;
322	var p = doc._parser;
323
324	// 1. Script type
325	//
326
327	// 2.1. If scripting is disabled
328	//
329	// 2.2. If the script element was created by an XML ... innerHTML ...
330	//
331	// 2.3. If the user agent does not support the scripting language ...
332	//
333	// 2.4. If the script element has its "already executed" flag set
334	if (e.manakaiAlreadyExecuted) {
335	// 2.5. Abort these steps at this point.
336	log ('Running a script: aborted');
337	return e;
338	}
339
340	// 3. Set the element's "already executed" flag.
341	e.manakaiAlreadyExecuted = true;
342
343	// 4. If the element has a src attribute, then a load for ...
344	// TODO: load an external resource
345
346	// 5. The first of the following options:
347
348	// 5.1.
349	if (/* TODO: If the document is still being parsed && */
350	e.defer && !e.async) {
351	p.scriptsExecutedAfterParsing.push (e);
352	log ('Running a script: aborted (defer)');
353	} else if (e.async && e.src != null) {
354	// TODO
355	} else if (e.async && e.src == null
356	/* && list of scripts that will execute asynchronously is not empty */) {
357	// TODO
358	} else if (e.src != null && e.manakaiParserInserted) {
359	// TODO
360	} else if (e.src != null) {
361	// TODO
362	} else {
363	executeScript (doc, e); // even if other scripts are already executing.
364	}
365
366	log ('Running a script: end');
367	}
368
369	return e;
370	}; // appendChild
371
372	function executeScript (doc, e) {
373	log ('executing a script block: start');
374
375	// If the load resulted in an error, then ... firing an error event ...
376
377	// If the load was successful
378	log ('load event fired at the script element');
379
380	if (true) {
381	// Scripting is enabled, Document.designMode is disabled,
382	// Document is the active document in its browsing context
383
384	var s;
385	if (e.src != null) {
386	// TODO: from external file
387	} else {
388	s = e.text;
389	}
390
391	parseAndRunScript (doc, s);
392	}
393
394	log ('executing a script block: end');
395	} // executeScript
396
397	function parseAndRunScript (doc, s) {
398	while (true) {
399	var matched = false;
400	s = s.replace (/^\sdocument\.write\s\(((?:'[^']'\|"[^"]")\s(?:,\s(?:'[^']'\|"[^"]")))\)\s;\s*/, function (s, t) {
401	matched = true;
402	var args = [];
403	t.replace (/('[^']'\|"[^"]")/g, function (s, v) {
404	args.push (v.substring (1, v.length - 1));
405	return '';
406	});
407	doc.write.apply (doc, args);
408	return '';
409	});
410	if (s == '') break;
411	if (!matched) {
412	log ('Script parse error: "' + s + '"');
413	break;
414	}
415	}
416	} // parseAndRunScript
417
418	function JSText (data) {
419	this.data = data;
420	} // JSText
421
422	JSDocument.prototype.manakaiAppendText =
423	JSElement.prototype.manakaiAppendText =
424	function (s) {
425	if (this.childNodes.length > 0 &&
426	this.childNodes[this.childNodes.length - 1] instanceof JSText) {
427	this.childNodes[this.childNodes.length - 1].data += s;
428	} else {
429	this.childNodes.push (new JSText (s));
430	}
431	}; // manakaiAppendText
432
433	JSDocument.prototype.open = function () {
434	// Two or fewer arguments
435
436	// Step 1.
437	var type = arguments[0] \|\| 'text/html';
438
439	// Step 2.
440	var replace = arguments[1] == 'replace';
441
442	// Step 3.
443	if (this._parser &&
444	!this._parser.scriptCreated &&
445	this._parser.in.insertionPoint != undefined) {
446	log ('document.open () in parsing mode is ignored');
447	return this;
448	}
449
450	// Step 4.
451	log ('onbeforeunload event fired');
452	log ('onunload event fired');
453
454	// Step 5.
455	if (this._parser) {
456	// Discard the parser.
457	}
458
459	// Step 6.
460	log ('document cleared by document.open ()');
461	this.childNodes = [];
462
463	// Step 7.
464	this._parser = new Parser (new InputStream (''), this);
465	this._parser.scriptCreated = true;
466
467	// Step 8.
468	this.manakaiIsHTML = true;
469
470	// Step 9.
471	// If not text/html, ...
472
473	// Step 10.
474	if (!replace) {
475	// History
476	}
477
478	// Step 11.
479	this._parser.setInsertionPoint (this._parser.in.s.length);
480
481	// Step 12.
482	return this;
483	}; // document.open
484
485	JSDocument.prototype.write = function () {
486	var p = this._parser;
487
488	// 1. If the insertion point is undefined, the open() method must be ...
489	if (isNaN (p.insertionPoint) \|\| p.insertionPoint == undefined) {
490	this.open ();
491	p = this._parser;
492	}
493
494	// 2. ... inserted into the input stream just before the insertion point.
495	var s = Array.join (arguments, '');
496	log ('document.write: insert "' + s + '"' +
497	' before "' + p.in.s.substring (p.insertionPoint, p.insertionPoint + 10) + '"');
498	p.in.s = p.in.s.substring (0, p.insertionPoint) + s
499	+ p.in.s.substring (p.insertionPoint, p.in.s.length);
500	p.insertionPoint += s.length;
501
502	// 3. If there is a script that will execute as soon as the parser resumes
503	// TODO
504
505	// 4. Process the characters that were inserted, ...
506	p.parse ();
507
508	// 5. Return
509	log ('document.write: return');
510	return;
511	}; // document.write
512
513	JSElement.prototype.__defineGetter__ ('text', function () {
514	var r = '';
515	for (var i = 0; i < this.childNodes.length; i++) {
516	if (this.childNodes[i] instanceof JSText) {
517	r += this.childNodes[i].data;
518	}
519	}
520	return r;
521	});
522
523	function dumpTree (n, indent) {
524	var r = '';
525	for (var i = 0; i < n.childNodes.length; i++) {
526	var node = n.childNodes[i];
527	if (node instanceof JSElement) {
528	r += '\| ' + indent + node.localName + '\n';
529	if (node.async) r += '\| ' + indent + ' async=""\n';
530	if (node.defer) r += '\| ' + indent + ' defer=""\n';
531	if (node.src) r += '\| ' + indent + ' src="' + node.src + '"\n';
532	r += dumpTree (node, indent + ' ');
533	} else if (node instanceof JSText) {
534	r += '\| ' + indent + '"' + node.data + '"\n';
535	} else {
536	r += '\| ' + indent + node + '\n';
537	}
538	}
539	return r;
540	} // dumpTree
541	</script>
542	</head>
543	<body onload="
544	document.sourceElement = document.getElementsByTagName ('textarea')[0];
545	document.logElement = document.getElementsByTagName ('output')[0];
546	update ();
547	">
548
549	<textarea onchange=" update () "><html>
550	<head></head><body>
551	<p>
552	<script>
553	document.write ('aaaaaaa</p><script>document.write("cccccc");</', 'script>bbbbbb');
554	</script>
555	<p>
556	</textarea>
557
558	<output></output>
559
560	</body>
561	</html>