619 lines
15 KiB
PHP
619 lines
15 KiB
PHP
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<?php
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/**
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* parseHTML is a HTML parser which works with PHP 4 and above.
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* It tries to handle invalid HTML to some degree.
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*
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* @version 1.0 beta
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* @author Milian Wolff (mail@milianw.de, http://milianw.de)
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* @license LGPL, see LICENSE_LGPL.txt and the summary below
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* @copyright (C) 2007 Milian Wolff
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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class parseHTML {
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/**
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* tags which are always empty (<br /> etc.)
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*
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* @var array<string>
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*/
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var $emptyTags = array(
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'br',
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'hr',
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'input',
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'img',
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'area',
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'link',
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'meta',
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'param',
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);
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/**
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* tags with preformatted text
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* whitespaces wont be touched in them
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*
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* @var array<string>
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*/
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var $preformattedTags = array(
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'script',
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'style',
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'pre',
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'code',
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);
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/**
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* supress HTML tags inside preformatted tags (see above)
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*
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* @var bool
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*/
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var $noTagsInCode = false;
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/**
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* html to be parsed
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*
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* @var string
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*/
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var $html = '';
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/**
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* node type:
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*
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* - tag (see isStartTag)
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* - text (includes cdata)
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* - comment
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* - doctype
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* - pi (processing instruction)
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*
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* @var string
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*/
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var $nodeType = '';
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/**
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* current node content, i.e. either a
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* simple string (text node), or something like
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* <tag attrib="value"...>
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*
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* @var string
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*/
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var $node = '';
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/**
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* wether current node is an opening tag (<a>) or not (</a>)
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* set to NULL if current node is not a tag
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* NOTE: empty tags (<br />) set this to true as well!
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*
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* @var bool | null
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*/
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var $isStartTag = null;
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/**
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* wether current node is an empty tag (<br />) or not (<a></a>)
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*
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* @var bool | null
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*/
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var $isEmptyTag = null;
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/**
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* tag name
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*
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* @var string | null
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*/
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var $tagName = '';
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/**
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* attributes of current tag
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*
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* @var array (attribName=>value) | null
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*/
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var $tagAttributes = null;
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/**
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* wether the current tag is a block element
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*
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* @var bool | null
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*/
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var $isBlockElement = null;
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/**
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* keep whitespace
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*
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* @var int
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*/
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var $keepWhitespace = 0;
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/**
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* list of open tags
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* count this to get current depth
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*
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* @var array
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*/
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var $openTags = array();
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/**
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* list of block elements
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*
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* @var array
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* TODO: what shall we do with <del> and <ins> ?!
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*/
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var $blockElements = array (
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# tag name => <bool> is block
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# block elements
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'address' => true,
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'blockquote' => true,
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'center' => true,
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'del' => true,
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'dir' => true,
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'div' => true,
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'dl' => true,
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'fieldset' => true,
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'form' => true,
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'h1' => true,
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'h2' => true,
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'h3' => true,
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'h4' => true,
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'h5' => true,
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'h6' => true,
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'hr' => true,
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'ins' => true,
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'isindex' => true,
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'menu' => true,
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'noframes' => true,
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'noscript' => true,
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'ol' => true,
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'p' => true,
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'pre' => true,
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'table' => true,
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'ul' => true,
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# set table elements and list items to block as well
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'thead' => true,
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'tbody' => true,
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'tfoot' => true,
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'td' => true,
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'tr' => true,
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'th' => true,
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'li' => true,
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'dd' => true,
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'dt' => true,
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# header items and html / body as well
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'html' => true,
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'body' => true,
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'head' => true,
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'meta' => true,
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'link' => true,
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'style' => true,
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'title' => true,
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# unfancy media tags, when indented should be rendered as block
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'map' => true,
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'object' => true,
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'param' => true,
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'embed' => true,
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'area' => true,
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# inline elements
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'a' => false,
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'abbr' => false,
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'acronym' => false,
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'applet' => false,
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'b' => false,
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'basefont' => false,
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'bdo' => false,
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'big' => false,
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'br' => false,
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'button' => false,
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'cite' => false,
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'code' => false,
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'del' => false,
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'dfn' => false,
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'em' => false,
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'font' => false,
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'i' => false,
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'img' => false,
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'ins' => false,
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'input' => false,
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'iframe' => false,
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'kbd' => false,
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'label' => false,
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'q' => false,
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'samp' => false,
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'script' => false,
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'select' => false,
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'small' => false,
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'span' => false,
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'strong' => false,
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'sub' => false,
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'sup' => false,
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'textarea' => false,
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'tt' => false,
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'var' => false,
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);
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/**
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* get next node, set $this->html prior!
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*
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* @param void
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* @return bool
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*/
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function nextNode() {
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if (empty($this->html)) {
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# we are done with parsing the html string
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return false;
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}
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static $skipWhitespace = true;
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if ($this->isStartTag && !$this->isEmptyTag) {
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array_push($this->openTags, $this->tagName);
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if (in_array($this->tagName, $this->preformattedTags)) {
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# dont truncate whitespaces for <code> or <pre> contents
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$this->keepWhitespace++;
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}
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}
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if ($this->html[0] == '<') {
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$token = substr($this->html, 0, 9);
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if (substr($token, 0, 2) == '<?') {
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# xml prolog or other pi's
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/** TODO **/
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#trigger_error('this might need some work', E_USER_NOTICE);
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$pos = strpos($this->html, '>');
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$this->setNode('pi', $pos + 1);
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return true;
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}
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if (substr($token, 0, 4) == '<!--') {
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# comment
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$pos = strpos($this->html, '-->');
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if ($pos === false) {
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# could not find a closing -->, use next gt instead
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# this is firefox' behaviour
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$pos = strpos($this->html, '>') + 1;
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} else {
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$pos += 3;
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}
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$this->setNode('comment', $pos);
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$skipWhitespace = true;
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return true;
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}
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if ($token == '<!DOCTYPE') {
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# doctype
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$this->setNode('doctype', strpos($this->html, '>')+1);
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$skipWhitespace = true;
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return true;
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}
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if ($token == '<![CDATA[') {
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# cdata, use text node
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# remove leading <![CDATA[
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$this->html = substr($this->html, 9);
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$this->setNode('text', strpos($this->html, ']]>')+3);
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# remove trailing ]]> and trim
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$this->node = substr($this->node, 0, -3);
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$this->handleWhitespaces();
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$skipWhitespace = true;
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return true;
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}
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if ($this->parseTag()) {
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# seems to be a tag
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# handle whitespaces
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if ($this->isBlockElement) {
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$skipWhitespace = true;
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} else {
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$skipWhitespace = false;
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}
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return true;
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}
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}
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if ($this->keepWhitespace) {
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$skipWhitespace = false;
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}
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# when we get here it seems to be a text node
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$pos = strpos($this->html, '<');
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if ($pos === false) {
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$pos = strlen($this->html);
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}
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$this->setNode('text', $pos);
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$this->handleWhitespaces();
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if ($skipWhitespace && $this->node == ' ') {
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return $this->nextNode();
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}
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$skipWhitespace = false;
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return true;
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}
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/**
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* parse tag, set tag name and attributes, see if it's a closing tag and so forth...
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*
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* @param void
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* @return bool
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*/
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function parseTag() {
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static $a_ord, $z_ord, $special_ords;
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if (!isset($a_ord)) {
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$a_ord = ord('a');
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$z_ord = ord('z');
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$special_ords = array(
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ord(':'), // for xml:lang
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ord('-'), // for http-equiv
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);
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}
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$tagName = '';
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$pos = 1;
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$isStartTag = $this->html[$pos] != '/';
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if (!$isStartTag) {
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$pos++;
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}
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# get tagName
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while (isset($this->html[$pos])) {
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$pos_ord = ord(strtolower($this->html[$pos]));
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if (($pos_ord >= $a_ord && $pos_ord <= $z_ord) || (!empty($tagName) && is_numeric($this->html[$pos]))) {
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$tagName .= $this->html[$pos];
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$pos++;
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} else {
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$pos--;
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break;
|
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}
|
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|
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}
|
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|
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||
|
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$tagName = strtolower($tagName);
|
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if (empty($tagName) || !isset($this->blockElements[$tagName])) {
|
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|
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# something went wrong => invalid tag
|
||
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$this->invalidTag();
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return false;
|
||
|
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}
|
||
|
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if ($this->noTagsInCode && end($this->openTags) == 'code' && !($tagName == 'code' && !$isStartTag)) {
|
||
|
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# we supress all HTML tags inside code tags
|
||
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$this->invalidTag();
|
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return false;
|
||
|
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}
|
||
|
|
|
||
|
|
# get tag attributes
|
||
|
|
/** TODO: in html 4 attributes do not need to be quoted **/
|
||
|
|
$isEmptyTag = false;
|
||
|
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$attributes = array();
|
||
|
|
$currAttrib = '';
|
||
|
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while (isset($this->html[$pos+1])) {
|
||
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$pos++;
|
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|
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# close tag
|
||
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if ($this->html[$pos] == '>' || $this->html[$pos].$this->html[$pos+1] == '/>') {
|
||
|
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if ($this->html[$pos] == '/') {
|
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$isEmptyTag = true;
|
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$pos++;
|
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}
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break;
|
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|
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}
|
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|
|
|
||
|
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$pos_ord = ord(strtolower($this->html[$pos]));
|
||
|
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if ( ($pos_ord >= $a_ord && $pos_ord <= $z_ord) || in_array($pos_ord, $special_ords)) {
|
||
|
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# attribute name
|
||
|
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$currAttrib .= $this->html[$pos];
|
||
|
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} elseif (in_array($this->html[$pos], array(' ', "\t", "\n"))) {
|
||
|
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# drop whitespace
|
||
|
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} elseif (in_array($this->html[$pos].$this->html[$pos+1], array('="', "='"))) {
|
||
|
|
# get attribute value
|
||
|
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$pos++;
|
||
|
|
$await = $this->html[$pos]; # single or double quote
|
||
|
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$pos++;
|
||
|
|
$value = '';
|
||
|
|
while (isset($this->html[$pos]) && $this->html[$pos] != $await) {
|
||
|
|
$value .= $this->html[$pos];
|
||
|
|
$pos++;
|
||
|
|
}
|
||
|
|
$attributes[$currAttrib] = $value;
|
||
|
|
$currAttrib = '';
|
||
|
|
} else {
|
||
|
|
$this->invalidTag();
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if ($this->html[$pos] != '>') {
|
||
|
|
$this->invalidTag();
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!empty($currAttrib)) {
|
||
|
|
# html 4 allows something like <option selected> instead of <option selected="selected">
|
||
|
|
$attributes[$currAttrib] = $currAttrib;
|
||
|
|
}
|
||
|
|
if (!$isStartTag) {
|
||
|
|
if (!empty($attributes) || $tagName != end($this->openTags)) {
|
||
|
|
# end tags must not contain any attributes
|
||
|
|
# or maybe we did not expect a different tag to be closed
|
||
|
|
$this->invalidTag();
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
array_pop($this->openTags);
|
||
|
|
if (in_array($tagName, $this->preformattedTags)) {
|
||
|
|
$this->keepWhitespace--;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
$pos++;
|
||
|
|
$this->node = substr($this->html, 0, $pos);
|
||
|
|
$this->html = substr($this->html, $pos);
|
||
|
|
$this->tagName = $tagName;
|
||
|
|
$this->tagAttributes = $attributes;
|
||
|
|
$this->isStartTag = $isStartTag;
|
||
|
|
$this->isEmptyTag = $isEmptyTag || in_array($tagName, $this->emptyTags);
|
||
|
|
if ($this->isEmptyTag) {
|
||
|
|
# might be not well formed
|
||
|
|
$this->node = preg_replace('# */? *>$#', ' />', $this->node);
|
||
|
|
}
|
||
|
|
$this->nodeType = 'tag';
|
||
|
|
$this->isBlockElement = $this->blockElements[$tagName];
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* handle invalid tags
|
||
|
|
*
|
||
|
|
* @param void
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
function invalidTag() {
|
||
|
|
$this->html = substr_replace($this->html, '<', 0, 1);
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* update all vars and make $this->html shorter
|
||
|
|
*
|
||
|
|
* @param string $type see description for $this->nodeType
|
||
|
|
* @param int $pos to which position shall we cut?
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
function setNode($type, $pos) {
|
||
|
|
if ($this->nodeType == 'tag') {
|
||
|
|
# set tag specific vars to null
|
||
|
|
# $type == tag should not be called here
|
||
|
|
# see this::parseTag() for more
|
||
|
|
$this->tagName = null;
|
||
|
|
$this->tagAttributes = null;
|
||
|
|
$this->isStartTag = null;
|
||
|
|
$this->isEmptyTag = null;
|
||
|
|
$this->isBlockElement = null;
|
||
|
|
|
||
|
|
}
|
||
|
|
$this->nodeType = $type;
|
||
|
|
$this->node = substr($this->html, 0, $pos);
|
||
|
|
$this->html = substr($this->html, $pos);
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* check if $this->html begins with $str
|
||
|
|
*
|
||
|
|
* @param string $str
|
||
|
|
* @return bool
|
||
|
|
*/
|
||
|
|
function match($str) {
|
||
|
|
return substr($this->html, 0, strlen($str)) == $str;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* truncate whitespaces
|
||
|
|
*
|
||
|
|
* @param void
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
function handleWhitespaces() {
|
||
|
|
if ($this->keepWhitespace) {
|
||
|
|
# <pre> or <code> before...
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
# truncate multiple whitespaces to a single one
|
||
|
|
$this->node = preg_replace('#\s+#s', ' ', $this->node);
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* normalize self::node
|
||
|
|
*
|
||
|
|
* @param void
|
||
|
|
* @return void
|
||
|
|
*/
|
||
|
|
function normalizeNode() {
|
||
|
|
$this->node = '<';
|
||
|
|
if (!$this->isStartTag) {
|
||
|
|
$this->node .= '/'.$this->tagName.'>';
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
$this->node .= $this->tagName;
|
||
|
|
foreach ($this->tagAttributes as $name => $value) {
|
||
|
|
$this->node .= ' '.$name.'="'.str_replace('"', '"', $value).'"';
|
||
|
|
}
|
||
|
|
if ($this->isEmptyTag) {
|
||
|
|
$this->node .= ' /';
|
||
|
|
}
|
||
|
|
$this->node .= '>';
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* indent a HTML string properly
|
||
|
|
*
|
||
|
|
* @param string $html
|
||
|
|
* @param string $indent optional
|
||
|
|
* @return string
|
||
|
|
*/
|
||
|
|
function indentHTML($html, $indent = " ", $noTagsInCode = false) {
|
||
|
|
$parser = new parseHTML;
|
||
|
|
$parser->noTagsInCode = $noTagsInCode;
|
||
|
|
$parser->html = $html;
|
||
|
|
$html = '';
|
||
|
|
$last = true; # last tag was block elem
|
||
|
|
$indent_a = array();
|
||
|
|
while($parser->nextNode()) {
|
||
|
|
if ($parser->nodeType == 'tag') {
|
||
|
|
$parser->normalizeNode();
|
||
|
|
}
|
||
|
|
if ($parser->nodeType == 'tag' && $parser->isBlockElement) {
|
||
|
|
$isPreOrCode = in_array($parser->tagName, array('code', 'pre'));
|
||
|
|
if (!$parser->keepWhitespace && !$last && !$isPreOrCode) {
|
||
|
|
$html = rtrim($html)."\n";
|
||
|
|
}
|
||
|
|
if ($parser->isStartTag) {
|
||
|
|
$html .= implode($indent_a);
|
||
|
|
if (!$parser->isEmptyTag) {
|
||
|
|
array_push($indent_a, $indent);
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
array_pop($indent_a);
|
||
|
|
if (!$isPreOrCode) {
|
||
|
|
$html .= implode($indent_a);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
$html .= $parser->node;
|
||
|
|
if (!$parser->keepWhitespace && !($isPreOrCode && $parser->isStartTag)) {
|
||
|
|
$html .= "\n";
|
||
|
|
}
|
||
|
|
$last = true;
|
||
|
|
} else {
|
||
|
|
if ($parser->nodeType == 'tag' && $parser->tagName == 'br') {
|
||
|
|
$html .= $parser->node."\n";
|
||
|
|
$last = true;
|
||
|
|
continue;
|
||
|
|
} elseif ($last && !$parser->keepWhitespace) {
|
||
|
|
$html .= implode($indent_a);
|
||
|
|
$parser->node = ltrim($parser->node);
|
||
|
|
}
|
||
|
|
$html .= $parser->node;
|
||
|
|
|
||
|
|
if (in_array($parser->nodeType, array('comment', 'pi', 'doctype'))) {
|
||
|
|
$html .= "\n";
|
||
|
|
} else {
|
||
|
|
$last = false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return $html;
|
||
|
|
}
|
||
|
|
/*
|
||
|
|
# testcase / example
|
||
|
|
error_reporting(E_ALL);
|
||
|
|
|
||
|
|
$html = '<p>Simple block on one line:</p>
|
||
|
|
|
||
|
|
<div>foo</div>
|
||
|
|
|
||
|
|
<p>And nested without indentation:</p>
|
||
|
|
|
||
|
|
<div>
|
||
|
|
<div>
|
||
|
|
<div>
|
||
|
|
foo
|
||
|
|
</div>
|
||
|
|
<div style=">"/>
|
||
|
|
</div>
|
||
|
|
<div>bar</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<p>And with attributes:</p>
|
||
|
|
|
||
|
|
<div>
|
||
|
|
<div id="foo">
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<p>This was broken in 1.0.2b7:</p>
|
||
|
|
|
||
|
|
<div class="inlinepage">
|
||
|
|
<div class="toggleableend">
|
||
|
|
foo
|
||
|
|
</div>
|
||
|
|
</div>';
|
||
|
|
#$html = '<a href="asdfasdf" title=\'asdf\' foo="bar">asdf</a>';
|
||
|
|
echo indentHTML($html);
|
||
|
|
die();
|
||
|
|
*/
|