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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> |
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<html xmlns="http://www.w3.org/1999/xhtml"> |
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<head> |
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<title>What::HTML - An HTML Parser</title> |
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<link rel="stylesheet" href="http://suika.fam.cx/www/style/html/pod.css" type="text/css" /> |
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<link rev="made" href="mailto:admin@suika.fam.cx" /> |
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</head> |
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<body> |
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<p><a name="__index__"></a></p> |
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<!-- INDEX BEGIN --> |
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<ul> |
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<li><a href="#name">NAME</a></li> |
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<li><a href="#synopsis">SYNOPSIS</a></li> |
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<li><a href="#description">DESCRIPTION</a></li> |
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<li><a href="#methods">METHODS</a></li> |
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<li><a href="#to_do">TO DO</a></li> |
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<li><a href="#see_also">SEE ALSO</a></li> |
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<li><a href="#author">AUTHOR</a></li> |
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<li><a href="#license">LICENSE</a></li> |
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</ul> |
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<!-- INDEX END --> |
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<hr /> |
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<p> |
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</p> |
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<h1><a name="name">NAME</a></h1> |
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<p>What::HTML - An HTML Parser</p> |
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<p> |
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</p> |
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<hr /> |
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<h1><a name="synopsis">SYNOPSIS</a></h1> |
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<pre> |
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use What::HTML; |
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|
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my $s = q<<!DOCTYPE html><html>...</html>>; |
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# $doc = an empty DOM |Document| object |
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my $on_error = sub { |
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my $error_code = shift; |
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warn $error_code, "\n"; |
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}; |
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|
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What::HTML->parse_string ($s => $doc, $onerror); |
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|
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## Then, |$doc| is the DOM representation of |$s|.</pre> |
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<p> |
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</p> |
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<hr /> |
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<h1><a name="description">DESCRIPTION</a></h1> |
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<p>The <code>What::HTML</code> module contains HTML parser and serializer.</p> |
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<p>The HTML parser can be used to construct the DOM tree representation |
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from an HTML document. The parsing and tree construction are done |
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as described in the Web Application 1.0 specification.</p> |
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<p>The HTML serializer can be used to obtain the HTML document representation |
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of a DOM tree (or a tree fragment thereof). The serialization |
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is performed as described in the Web Applications 1.0 specification |
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for <code>innerHTML</code> DOM attribute.</p> |
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<p>This module is part of WHAT.pm - Perl Modules for |
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Web Hypertext Application Technologies.</p> |
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<p> |
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</p> |
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<hr /> |
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<h1><a name="methods">METHODS</a></h1> |
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<dl> |
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<dt><strong><a name="item_parse_string">[<em>$doc</em> =] What::HTML->parse_string (<em>$s</em>, <em>$doc</em>[, <em>$onerror</em>]);</a></strong><br /> |
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</dt> |
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<dd> |
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Parse a string <em>$s</em> as an HTML document. |
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</dd> |
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<dd> |
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<p>The first argument, <em>$s</em>, MUST be a string. It is parsed |
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as a sequence of characters representing an HTML document.</p> |
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</dd> |
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<dd> |
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<p>The second argument, <em>$doc</em>, MUST be an empty read-write |
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DOM <code>Document</code> object. The HTML DOM tree is constructed |
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onto this <code>Document</code> object.</p> |
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</dd> |
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<dd> |
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<p>The third argument, <em>$onerror</em>, MUST be a reference to |
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the error handler code. Whenever a parse error is detected, |
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this code is invoked with an argument that contains a |
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useless string that might describe what is wrong. |
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The code MAY throw an exception, so that whole the parsing |
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process aborts. Otherwise, the parser will continue to |
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process the input. The code MUST NOT modify <em>$s</em> or <em>$doc</em>. |
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If it does, then the result is undefined. |
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This argument is optional; if missing, any |
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parse error makes that string being <code>warn</code>ed.</p> |
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</dd> |
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<dd> |
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<p>The method returns the DOM <code>Document</code> object (i.e. the second argument).</p> |
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</dd> |
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<dd> |
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<p>Note that the <code>What::NanoDOM</code> module provides a non-conforming |
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implementation of DOM that only implements the subset that |
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is necessary for the purpose of <code>What::HTML</code>'s parsing and |
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serializing. |
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With this module, creating a new HTML <code>Document</code> object |
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from a string containing HTML document can be coded as:</p> |
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</dd> |
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<dd> |
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<pre> |
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use What::HTML; |
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use What::NanoDOM; |
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my $doc = What::HTML->parse_string ($s => What::NanoDOM->new, $onerror);</pre> |
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</dd> |
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<p></p> |
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<dt><strong><a name="item_get_inner_html"><em>$s</em> = What::HTML->get_inner_html (<em>$node</em>[, <em>$onerror</em>]);</a></strong><br /> |
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</dt> |
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<dd> |
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Return the HTML serialization of a DOM node <em>$node</em>. |
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</dd> |
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<dd> |
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<p>The first argument, <em>$node</em>, MUST be a DOM <code>Document</code>, |
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<code>Node</code>, or <code>DocumentFragment</code> object.</p> |
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</dd> |
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<dd> |
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<p>The second argument, <em>$onerror</em>, MUST be a reference to the |
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error handling code. This code will be invoked if a descendant |
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of <code>$node</code> is not of <code>Element</code>, <code>Text</code>, <code>CDATASection</code>, |
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<code>Comment</code>, <code>DocumentType</code>, or <code>EntityReference</code> so |
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that <code>INVALID_STATE_ERR</code> MUST be thrown. |
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The code will be invoked with an argument, which is the node |
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whose type is invalid. |
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This argument is optional; if missing, any such |
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node is simply ignored.</p> |
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</dd> |
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<dd> |
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<p>The method returns the <code>inner_html</code> attribute |
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value, i.e. the HTML serialization of the <code>$node</code>.</p> |
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</dd> |
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<p></p></dl> |
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<p> |
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</p> |
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<hr /> |
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<h1><a name="to_do">TO DO</a></h1> |
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<p>Tokenizer should emit a sequence of character tokens as one token |
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to improve performance.</p> |
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<p>A method that accepts a byte stream as an input.</p> |
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<p>Charset detection algorithm.</p> |
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<p>Setting inner_html.</p> |
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<p>And there are many ``TODO''s and ``ISSUE''s in the source code.</p> |
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<p> |
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</p> |
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<hr /> |
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<h1><a name="see_also">SEE ALSO</a></h1> |
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<p>Web Applications 1.0 Working Draft (aka HTML5) |
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<http://whatwg.org/html5>. (Revision 792, 1 May 2007)</p> |
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<p><a href="../What/NanoDOM.html">the What::NanoDOM manpage</a></p> |
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<p> |
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</p> |
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<hr /> |
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<h1><a name="author">AUTHOR</a></h1> |
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<p>Wakaba <<a href="mailto:w@suika.fam.cx">w@suika.fam.cx</a>>.</p> |
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<p> |
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</p> |
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<hr /> |
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<h1><a name="license">LICENSE</a></h1> |
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<p>Copyright 2007 Wakaba <<a href="mailto:w@suika.fam.cx">w@suika.fam.cx</a>></p> |
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<p>This library is free software; you can redistribute it |
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and/or modify it under the same terms as Perl itself.</p> |
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