/[suikacvs]/markup/html/scripting-parser/parser.html
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revision 1.10 by wakaba, Sun Apr 27 10:34:18 2008 UTC revision 1.13 by wakaba, Sun Apr 27 11:27:04 2008 UTC
# Line 2  Line 2 
2  <html lang=en>  <html lang=en>
3  <head>  <head>
4  <title>Live Scripting HTML Parser</title>  <title>Live Scripting HTML Parser</title>
5    <link rel=author href="http://suika.fam.cx/~wakaba/who?">
6    <link rel=license href="http://suika.fam.cx/c/gnu/gpl"
7        title="GNU GPL2 or later">
8  <style>  <style>
9    h1, h2 {    h1 {
10        margin: 0;
11        font-size: 150%;
12      }
13      h2 {
14      margin: 0;      margin: 0;
15      font-size: 100%;      font-size: 100%;
16    }    }
17    p, pre {    p {
18      margin: 0;      margin: 0 1em;
19    }    }
20    textarea {    textarea {
21      width: 100%;      width: 100%;
# Line 79  Line 86 
86      this.input = i;      this.input = i;
87      this.scriptsExecutedAfterParsing = [];      this.scriptsExecutedAfterParsing = [];
88      this.scriptsExecutedSoon = [];      this.scriptsExecutedSoon = [];
89        this.scriptsExecutedAsynchronously = [];
90    } // Parser    } // Parser
91    
92    Parser.prototype.getNextToken = function () {    Parser.prototype.getNextToken = function () {
# Line 335  Line 343 
343    
344      // "When a script completes loading" rules start applying.      // "When a script completes loading" rules start applying.
345    
346      // List of scripts that will execute as soon as possible      while (this.scriptsExecutedSoon.length > 0 ||
347      for (var i = 0; i < this.scriptsExecutedSoon.length; i++) {             this.scriptsExecutedAsynchronously.length > 0) {
348        var e = this.scriptsExecutedSoon[i];        // Handle "list of scripts that will execute as soon as possible".
349          while (this.scriptsExecutedSoon.length > 0) {
350            var e = this.scriptsExecutedSoon.shift ();
351      
352            // If it has completed loading
353            log ('Execute an external script not inserted by parser...');
354            executeScript (this.doc, e);
355    
356            // NOTE: It MAY be executed before the end of the parsing, according
357            // to the spec.
358            this.hasAsyncScript = true;
359          }
360    
361          // Handle "list of scripts that will execute asynchronously".
362          while (this.scriptsExecutedAsynchronously.length > 0) {
363            var e = this.scriptsExecutedAsynchronously.shift ();
364    
365            // Step 1.
366            // We assume that all scripts have been loaded at this time.
367      
368            // Step 2.
369            log ('Execute an asynchronous script...');
370            executeScript (this.doc, e);
371    
372            // Step 3.
373            //
374    
375            // Step 4.
376            //
377    
378        // If it has completed loading          this.hasAsyncScript = true;
379        log ('Execute an external script not inserted by parser...');        }
       executeScript (this.doc, e);  
   
       // NOTE: It MAY be executed before the end of the parsing, according  
       // to the spec.  
       this.hasAsyncScript = true;  
380      }      }
381    
     // TODO: Handles  
     // "list of scripts that will execute asynchronously"  
   
382      // Handle "list of scripts that will execute when the document has finished      // Handle "list of scripts that will execute when the document has finished
383      // parsing".      // parsing".
384      var list = this.scriptsExecutedAfterParsing;      var list = this.scriptsExecutedAfterParsing;
# Line 444  Line 472 
472          p.scriptsExecutedAfterParsing.push (e);          p.scriptsExecutedAfterParsing.push (e);
473          log ('Running a script: aborted (defer)');          log ('Running a script: aborted (defer)');
474        } else if (e.async && e.src != null) {        } else if (e.async && e.src != null) {
475          // TODO          p.scriptsExecutedAsynchronously.push (e);
476        } else if (e.async && e.src == null          log ('Running a script: aborted (async src)');
477                   /* && list of scripts that will execute asynchronously is not empty */) {        } else if (e.async && e.src == null &&
478          // TODO                   p.scriptsExecutedAsynchronously.length > 0) {
479            p.scriptsExecutedAsynchronously.push (e);
480            log ('Running a script: aborted (async)');
481            // ISSUE: What is the difference with the case above?
482        } else if (e.src != null && e.manakaiParserInserted) {        } else if (e.src != null && e.manakaiParserInserted) {
483          if (p.scriptExecutedWhenParserResumes) {          if (p.scriptExecutedWhenParserResumes) {
484            log ('Error: There is a script that will execute as soon as the parser resumes.');            log ('Error: There is a script that will execute as soon as the parser resumes.');
# Line 504  Line 535 
535        var m;        var m;
536        if (m = uri.match (/^javascript:\s*(?:'([^']*)'|"([^"]+)")\s*$/i)) {        if (m = uri.match (/^javascript:\s*(?:'([^']*)'|"([^"]+)")\s*$/i)) {
537          if (m[1]) {          if (m[1]) {
538            return m[1].replace (/\\u([0-9A-F]{4})/g, function (s, v) {            return unescapeJSLiteral (m[1]);
             return String.fromCharCode (parseInt ('0x' + v));  
           });  
539          } else if (m[2]) {          } else if (m[2]) {
540            return m[2].replace (/\\u([0-9A-F]{4})/g, function (s, v) {            return unescapeJSLiteral (m[2]);
             return String.fromCharCode (parseInt ('0x' + v));  
           });  
541          } else {          } else {
542            return null;            return null;
543          }          }
# Line 531  Line 558 
558          matched = true;          matched = true;
559          var args = [];          var args = [];
560          t.replace (/('[^']*'|"[^"]*")/g, function (s, v) {          t.replace (/('[^']*'|"[^"]*")/g, function (s, v) {
561            args.push (v.substring (1, v.length - 1));            args.push (unescapeJSLiteral (v.substring (1, v.length - 1)));
562            return '';            return '';
563          });          });
564          doc.write.apply (doc, args);          doc.write.apply (doc, args);
# Line 540  Line 567 
567        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*/,        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*/,
568        function (s, t, u) {        function (s, t, u) {
569          matched = true;          matched = true;
570          var args = [t ? t : u];          var args = [unescapeJSLiteral (t ? t : u)];
571          doc._insertExternalScript.apply (doc, args);          doc._insertExternalScript.apply (doc, args);
572          return '';          return '';
573        });        });
# Line 552  Line 579 
579      }      }
580    } // parseAndRunScript    } // parseAndRunScript
581    
582      function unescapeJSLiteral (s) {
583        return s.replace (/\\u([0-9A-Fa-f]{4})/g, function (t, v) {
584          return String.fromCharCode (parseInt ('0x' + v));
585        });
586      } // unescapeJSLiteral
587    
588    function JSText (data) {    function JSText (data) {
589      this.data = data;      this.data = data;
590    } // JSText    } // JSText
# Line 788  Note that strings may be delimited by <c Line 821  Note that strings may be delimited by <c
821  <code>src</code> attribute of the <code>script</code> element.  In addition,  <code>src</code> attribute of the <code>script</code> element.  In addition,
822  the <abbr title="Uniform Resource Identifiers">URI</abbr> must be conform to  the <abbr title="Uniform Resource Identifiers">URI</abbr> must be conform to
823  the regular expression <code>^javascript:\s*(?:"[^"]*"|'[^']*')\s*$</code>.  the regular expression <code>^javascript:\s*(?:"[^"]*"|'[^']*')\s*$</code>.
824  <li>Only supports <code>\u<var>HHHH</var></code> escapes only in  <li>Only supports <code>\u<var>HHHH</var></code> escapes in JavaScript
825  <code>javascript:</code> URI.  string literals.
826    <li>Does not handle <i>stop parsing</i> phase correctly if the document is
827    replaced by <code>document.open ()</code> call.  In other word, delayed
828    (deferred or asynchronous) script executions and event firings might be
829    treated in a wrong way if a <code>document.open ()</code> invocation
830    is implicitly done by <code>document.write ()</code> in a delayed script.
831  </ul>  </ul>
832    
833  <p>For some reason, this parser does not work in browsers that do  <p>For some reason, this parser does not work in browsers that do
834  not support JavaScript 1.5.  not support JavaScript 1.5.
835    
836  <!-- TODO: license -->  <!-- TODO: |src| attribute value should refer the value at the time
837    when it is inserted into the document, not the value when the script is
838    executed.  Currently it does not matter, since we don't allow dynamic
839    modification to the |src| content/DOM attribute value yet. -->
840    
841  </body>  </body>
 </html>  
842    </html>
843    <!-- $Date$ -->
844    <!--
845    
846    Copyright 2008 Wakaba <w@suika.fam.cx>
847    
848    This program is free software; you can redistribute it and/or
849    modify it under the terms of the GNU General Public License
850    as published by the Free Software Foundation; either version 2
851    of the License, or (at your option) any later version.
852    
853    This program is distributed in the hope that it will be useful,
854    but WITHOUT ANY WARRANTY; without even the implied warranty of
855    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
856    GNU General Public License for more details.
857    
858    You should have received a copy of the GNU General Public License
859    along with this program; if not, write to the Free Software
860    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
861    
862    -->
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