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Chris Sewell
303
lib/symfony/util/sfDomCssSelector.class.php
Executable file
303
lib/symfony/util/sfDomCssSelector.class.php
Executable file
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<?php
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/*
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* This file is part of the symfony package.
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* (c) 2004-2006 Fabien Potencier <fabien.potencier@symfony-project.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* sfDomCssSelector allows to navigate a DOM with CSS selector.
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*
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* based on getElementsBySelector version 0.4 - Simon Willison, March 25th 2003
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* http://simon.incutio.com/archive/2003/03/25/getElementsBySelector
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*
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* @package symfony
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* @subpackage util
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* @author Fabien Potencier <fabien.potencier@symfony-project.com>
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* @version SVN: $Id: sfDomCssSelector.class.php 4236 2007-06-18 08:40:13Z fabien $
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*/
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class sfDomCssSelector
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{
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protected $dom = null;
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public function __construct($dom)
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{
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$this->dom = $dom;
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}
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public function getTexts($selector)
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{
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$texts = array();
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foreach ($this->getElements($selector) as $element)
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{
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$texts[] = $element->nodeValue;
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}
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return $texts;
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}
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public function getElements($selector)
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{
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$all_nodes = array();
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foreach ($this->tokenize_selectors($selector) as $selector)
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{
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$nodes = array($this->dom);
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foreach ($this->tokenize($selector) as $token)
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{
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$combinator = $token['combinator'];
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$token = trim($token['name']);
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$pos = strpos($token, '#');
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if (false !== $pos && preg_match('/^[A-Za-z0-9]*$/', substr($token, 0, $pos)))
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{
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// Token is an ID selector
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$tagName = substr($token, 0, $pos);
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$id = substr($token, $pos + 1);
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$xpath = new DomXPath($this->dom);
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$element = $xpath->query(sprintf("//*[@id = '%s']", $id))->item(0);
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if (!$element || ($tagName && strtolower($element->nodeName) != $tagName))
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{
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// tag with that ID not found
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return array();
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}
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// Set nodes to contain just this element
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$nodes = array($element);
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continue; // Skip to next token
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}
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$pos = strpos($token, '.');
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if (false !== $pos && preg_match('/^[A-Za-z0-9]*$/', substr($token, 0, $pos)))
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{
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// Token contains a class selector
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$tagName = substr($token, 0, $pos);
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if (!$tagName)
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{
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$tagName = '*';
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}
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$className = substr($token, $pos + 1);
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// Get elements matching tag, filter them for class selector
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$founds = $this->getElementsByTagName($nodes, $tagName, $combinator);
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$nodes = array();
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foreach ($founds as $found)
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{
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if (preg_match('/\b'.$className.'\b/', $found->getAttribute('class')))
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{
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$nodes[] = $found;
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}
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}
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continue; // Skip to next token
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}
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// Code to deal with attribute selectors
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if (preg_match('/^(\w*)(\[.+\])$/', $token, $matches))
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{
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$tagName = $matches[1] ? $matches[1] : '*';
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preg_match_all('/
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\[
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(\w+) # attribute
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([=~\|\^\$\*]?) # modifier (optional)
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=? # equal (optional)
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(
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"([^"]*)" # quoted value (optional)
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([^\]]*) # non quoted value (optional)
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)
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\]
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/x', $matches[2], $matches, PREG_SET_ORDER);
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// Grab all of the tagName elements within current node
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$founds = $this->getElementsByTagName($nodes, $tagName, $combinator);
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$nodes = array();
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foreach ($founds as $found)
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{
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$ok = false;
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foreach ($matches as $match)
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{
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$attrName = $match[1];
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$attrOperator = $match[2];
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$attrValue = $match[4];
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switch ($attrOperator)
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{
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case '=': // Equality
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$ok = $found->getAttribute($attrName) == $attrValue;
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break;
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case '~': // Match one of space seperated words
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$ok = preg_match('/\b'.preg_quote($attrValue, '/').'\b/', $found->getAttribute($attrName));
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break;
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case '|': // Match start with value followed by optional hyphen
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$ok = preg_match('/^'.preg_quote($attrValue, '/').'-?/', $found->getAttribute($attrName));
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break;
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case '^': // Match starts with value
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$ok = 0 === strpos($found->getAttribute($attrName), $attrValue);
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break;
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case '$': // Match ends with value
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$ok = $attrValue == substr($found->getAttribute($attrName), -strlen($attrValue));
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break;
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case '*': // Match ends with value
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$ok = false !== strpos($found->getAttribute($attrName), $attrValue);
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break;
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default :
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// Just test for existence of attribute
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$ok = $found->hasAttribute($attrName);
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}
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if (false == $ok)
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{
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break;
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}
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}
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if ($ok)
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{
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$nodes[] = $found;
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}
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}
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continue; // Skip to next token
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}
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// If we get here, token is JUST an element (not a class or ID selector)
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$nodes = $this->getElementsByTagName($nodes, $token, $combinator);
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}
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foreach ($nodes as $node)
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{
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if (!$node->getAttribute('sf_matched'))
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{
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$node->setAttribute('sf_matched', true);
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$all_nodes[] = $node;
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}
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}
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}
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foreach ($all_nodes as $node)
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{
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$node->removeAttribute('sf_matched');
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}
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return $all_nodes;
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}
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protected function getElementsByTagName($nodes, $tagName, $combinator = ' ')
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{
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$founds = array();
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foreach ($nodes as $node)
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{
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switch ($combinator)
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{
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case ' ':
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// Descendant selector
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foreach ($node->getElementsByTagName($tagName) as $element)
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{
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$founds[] = $element;
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}
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break;
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case '>':
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// Child selector
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foreach ($node->childNodes as $element)
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{
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if ($tagName == $element->nodeName)
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{
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$founds[] = $element;
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}
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}
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break;
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case '+':
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// Adjacent selector
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$element = $node->nextSibling;
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if ($element && '#text' == $element->nodeName)
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{
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$element = $element->nextSibling;
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}
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if ($element && $tagName == $element->nodeName)
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{
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$founds[] = $element;
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}
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break;
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}
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}
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return $founds;
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}
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protected function tokenize_selectors($selector)
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{
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// split tokens by , except in an attribute selector
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$tokens = array();
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$quoted = false;
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$token = '';
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for ($i = 0, $max = strlen($selector); $i < $max; $i++)
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{
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if (',' == $selector[$i] && !$quoted)
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{
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$tokens[] = trim($token);
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$token = '';
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}
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else if ('"' == $selector[$i])
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{
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$token .= $selector[$i];
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$quoted = $quoted ? false : true;
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}
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else
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{
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$token .= $selector[$i];
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}
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}
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if ($token)
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{
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$tokens[] = trim($token);
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}
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return $tokens;
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}
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protected function tokenize($selector)
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{
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// split tokens by space except if space is in an attribute selector
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$tokens = array();
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$combinators = array(' ', '>', '+');
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$quoted = false;
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$token = array('combinator' => ' ', 'name' => '');
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for ($i = 0, $max = strlen($selector); $i < $max; $i++)
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{
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if (in_array($selector[$i], $combinators) && !$quoted)
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{
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// remove all whitespaces around the combinator
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$combinator = $selector[$i];
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while (in_array($selector[$i + 1], $combinators))
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{
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if (' ' != $selector[++$i])
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{
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$combinator = $selector[$i];
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}
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}
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$tokens[] = $token;
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$token = array('combinator' => $combinator, 'name' => '');
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}
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else if ('"' == $selector[$i])
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{
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$token['name'] .= $selector[$i];
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$quoted = $quoted ? false : true;
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}
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else
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{
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$token['name'] .= $selector[$i];
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}
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}
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if ($token['name'])
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{
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$tokens[] = $token;
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}
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return $tokens;
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}
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}
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