mirror of
https://github.com/silverstripe/silverstripe-framework
synced 2024-10-22 14:05:37 +02:00
111 lines
3.3 KiB
PHP
111 lines
3.3 KiB
PHP
<?php
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/**
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* CSSContentParser enables parsing & assertion running of HTML content via CSS selectors.
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*
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* It works by converting the content to XHTML using tidy, rewriting the CSS selectors as XPath queries, and executing
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* those using SimpeXML.
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*
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* It was built to facilitate testing using PHPUnit and contains a number of assert methods that will throw PHPUnit
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* assertion exception when applicable.
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*
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* Tries to use the PHP Tidy extension (http://php.net/tidy),
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* and falls back to the "tidy" CLI tool. If none of those exists,
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* the string is parsed directly without sanitization.
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*
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* @package sapphire
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* @subpackage core
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*/
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class CSSContentParser extends Object {
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protected $simpleXML = null;
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function __construct($content) {
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if(extension_loaded('tidy')) {
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// using the tiny php extension
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$tidy = new Tidy();
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$tidy->parseString(
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$content,
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array(
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'output-xhtml' => true,
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'numeric-entities' => true,
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'wrap' => 99999, // We need this to be consistent for functional test string comparisons
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),
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'utf8'
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);
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$tidy->cleanRepair();
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$tidy = str_replace('xmlns="http://www.w3.org/1999/xhtml"','',$tidy);
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$tidy = str_replace(' ','',$tidy);
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} elseif(@shell_exec('which tidy')) {
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// using tiny through cli
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$CLI_content = escapeshellarg($content);
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$tidy = `echo $CLI_content | tidy -n -q -utf8 -asxhtml 2> /dev/null`;
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$tidy = str_replace('xmlns="http://www.w3.org/1999/xhtml"','',$tidy);
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$tidy = str_replace(' ','',$tidy);
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} else {
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// no tidy library found, hence no sanitizing
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$tidy = $content;
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}
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$this->simpleXML = @simplexml_load_string($tidy, 'SimpleXMLElement', LIBXML_NOWARNING);
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if(!$this->simpleXML) {
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throw new Exception('CSSContentParser::__construct(): Could not parse content. Please check the PHP extension tidy is installed.');
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}
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parent::__construct();
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}
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/**
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* Returns a number of SimpleXML elements that match the given CSS selector.
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* Currently the selector engine only supports querying by tag, id, and class.
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* See {@link getByXpath()} for a more direct selector syntax.
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*
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* @param String $selector
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* @return SimpleXMLElement
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*/
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function getBySelector($selector) {
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$xpath = $this->selector2xpath($selector);
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return $this->getByXpath($xpath);
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}
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/**
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* Allows querying the content through XPATH selectors.
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*
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* @param String $xpath SimpleXML compatible XPATH statement
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* @return SimpleXMLElement|false
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*/
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function getByXpath($xpath) {
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return $this->simpleXML->xpath($xpath);
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}
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/**
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* Converts a CSS selector into an equivalent xpath expression.
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* Currently the selector engine only supports querying by tag, id, and class.
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*
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* @param String $selector See {@link getBySelector()}
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* @return String XPath expression
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*/
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function selector2xpath($selector) {
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$parts = preg_split('/\\s+/', $selector);
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$xpath = "";
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foreach($parts as $part) {
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if(preg_match('/^([A-Za-z][A-Za-z0-9]*)/', $part, $matches)) {
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$xpath .= "//$matches[1]";
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} else {
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$xpath .= "//*";
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}
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$xfilters = array();
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if(preg_match('/#([^#.\[]+)/', $part, $matches)) {
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$xfilters[] = "@id='$matches[1]'";
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}
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if(preg_match('/\.([^#.\[]+)/', $part, $matches)) {
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$xfilters[] = "contains(@class,'$matches[1]')";
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}
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if($xfilters) $xpath .= '[' . implode(',', $xfilters) . ']';
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}
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return $xpath;
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}
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}
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