DOM parser that allows HTML5-style </ in <script> tag
Update: html5lib (bottom of question) seems to get close, I just need to improve my understanding of how it's used.
I am attempting to find an HTML5-compatible DOM parser for PHP 5.3. In particular, I need to access the following HTML-like CDATA within a script tag:
<script type="text/x-jquery-tmpl" id="foo">
<table><tr><td>${name}</td></tr></table>
</script>
Most parsers will end parsing prematurely because HTML 4.01 ends script tag parsing when it finds ETAGO (</) inside a <script> tag. However, HTML5 allows for </ before </script>. All of the parsers I have tried so far have either failed, or they are so poorly documented that I haven't figured out if they work or not.
My requirements:
- Real parser, not regex hacks.
- Ability to load full pages or HTML fragments.
- Ability to pull script contents back out, selecting by the tag's id attribute.
Input:
<script id="foo"><td>bar</td></script>
Example of failing output (no closing </td>):
<script id="foo"><td>bar</script>
Some parsers and their results:
DOMDocument (fails)
Source:
<?php
header('Content-type: text/plain');
$d = new DOMDocument;
$d->loadHTML('<script id="foo"><td>bar</td></script>');
echo $d->saveHTML();
Output:
Warning: DOMDocument::loadHTML(): Unexpected end tag : td in Entity, line: 1 in /home/adam/public_html/2010/10/26/dom.php on line 5
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
&开发者_运维技巧lt;html><head><script id="foo"><td>bar</script></head></html>
FluentDOM (fails)
Source:
<?php
header('Content-type: text/plain');
require_once 'FluentDOM/src/FluentDOM.php';
$html = "<html><head></head><body><script id='foo'><td></td></script></body></html>";
echo FluentDOM($html, 'text/html');
Output:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html><head></head><body><script id="foo"><td></script></body></html>
phpQuery (fails)
Source:
<?php
header('Content-type: text/plain');
require_once 'phpQuery.php';
phpQuery::newDocumentHTML(<<<EOF
<script type="text/x-jquery-tmpl" id="foo">
<td>test</td>
</script>
EOF
);
echo (string)pq('#foo');
Output:
<script type="text/x-jquery-tmpl" id="foo">
<td>test
</script>
html5lib (passes)
Possibly promising. Can I get at the contents of the script#foo tag?
Source:
<?php
header('Content-type: text/plain');
include 'HTML5/Parser.php';
$html = "<!DOCTYPE html><html><head></head><body><script id='foo'><td></td></script></body></html>";
$d = HTML5_Parser::parse($html);
echo $d->saveHTML();
Output:
<html><head></head><body><script id="foo"><td></td></script></body></html>
I had the same problem and apparently you can hack your way trough this by loading the document as XML, and save it as HTML :)
$d = new DOMDocument;
$d->loadXML('<script id="foo"><td>bar</td></script>');
echo $d->saveHTML();
But of course the markup must be error-free for loadXML to work.
I just find out (in my case).
try to change parameters option of loadHTML using LIBXML_SCHEMA_CREATE in DOMDocument
$dom = new DOMDocument;
libxml_use_internal_errors(true);
//$dom->loadHTML($buffer, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
$dom->loadHTML($buffer, LIBXML_SCHEMA_CREATE);
Re: html5lib
You click on the download tab and download the PHP version of the parser.
You untar the archive in a local folder
tar -zxvf html5lib-php-0.1.tar.gz
x html5lib-php-0.1/
x html5lib-php-0.1/VERSION
x html5lib-php-0.1/docs/
... etc
You change directories and create a file named hello.php
cd html5lib-php-0.1
touch hello.php
You place the following PHP code in hello.php
$html = '<html><head></head><body>
<script type="text/x-jquery-tmpl" id="foo">
<table><tr><td>${name}</td></tr></table>
</script>
</body></html>';
$dom = HTML5_Parser::parse($html);
var_dump($dom->saveXml());
echo "\nDone\n";
You run hello.php from the command line
php hello.php
The parser will parse the document tree, and return a DOMDocument object, which can be manipulated as any other DOMDocument object.
FluentDOM uses the DOMDocument but blocks loading notices and warnings. It does not have an own parser. You can add your own loaders (For example one that uses the html5lib).
I added comment tags (<!-- ... -->) in my jQuery template blocks (CDATA blocks also failed) and DOMDocument did not touch the internal HTML.
Then, before I used the jQuery templates, I wrote a script to remove the comments.
$(function() {
$('script[type="text/x-jquery-tmpl"]').text(function() {
// The comment node in this context is actually a text node.
return $.trim($(this).text()).replace(/^<!--([\s\S]*)-->$/, '$1');
});
});
Not ideal, but I wasn't sure of a better workaround.
I ran into this exact problem.
PHP Dom Document parses the html inside a script tag and that can actually lead to a completely different dom.
Since I didn't want to use another library than DomDocument. I wrote a few lines that strips any script content, then you do what ever you need to do with dom document and afterwards you put that script content back.
Obviously the script content isn't available to your dom object because it's empty.
With the following lines of php code you can 'fix' this problem. Be warned that script tags in scripts tags will cause bug.
$scripts = array();
// this will select all script tags non-greedy. If you have a script tag in your script tag, it will cause problems.
preg_match_all("/((<script.*>)(.*))\/script>/sU", $html, $scripts);
// Make content of scripts empty
$html = str_replace($scripts[3], '', $html);
// Do DOM Document stuff here
// Put script contents back
$html = str_replace($scripts[2], $scripts[1], $html);
I hope this will help some people :-).
加载中,请稍侯......
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