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<?php
namespace SMW\Tests\Utils\Validators;
use DOMDocument;
use Symfony\Component\CssSelector\CssSelectorConverter;
/**
* @license GNU GPL v2+
* @since 3.0
*
* @author Stephan Gambke
*/
class HtmlValidator extends \PHPUnit_Framework_Assert {
/**
* @var array
*/
private $documentCache = [];
/**
* @var null|boolean
*/
private $canUse;
/**
* @param string $actual
* @param string $message
*/
public function assertThatHtmlIsValid( $actual, $message = '' ) {
$document = $this->getDomDocumentFromHtmlFragment( $actual );
self::assertTrue( $document !== false, "Failed test `{$message}` (assertion HtmlIsValid) for $actual" );
}
/**
* @return boolean
*/
public function canUse() {
if ( $this->canUse === null ) {
$this->canUse = class_exists( '\Symfony\Component\CssSelector\CssSelectorConverter' );
}
return $this->canUse;
}
/**
* @param string $fragment
*
* @return bool|DOMDocument
*/
private function getDomDocumentFromHtmlFragment( $fragment ) {
$cacheKey = md5( $fragment );
if ( !isset( $this->documentCache[ $cacheKey ] ) ) {
$this->addHtmlFragmentToCache( $fragment, $cacheKey );
}
return $this->documentCache[ $cacheKey ];
}
/**
* @param $fragment
* @param $cacheKey
*/
private function addHtmlFragmentToCache( $fragment, $cacheKey ) {
$fragment = self::wrapHtmlFragment( $fragment );
$document = new DOMDocument();
$document->preserveWhiteSpace = false;
libxml_use_internal_errors( true );
$result = $document->loadHTML( $fragment );
libxml_use_internal_errors( false );
$this->documentCache[ $cacheKey ] = ( $result === true ) ? $document : false;
}
/**
* @param string $fragment
*
* @return string
*/
private static function wrapHtmlFragment( $fragment ) {
return "<!DOCTYPE html><html><head><meta charset='utf-8'/><title>SomeTitle</title></head><body>$fragment</body></html>";
}
/**
* @param string | string[] $cssSelectors
* @param string $htmlFragment
* @param string $message
*/
public function assertThatHtmlContains( $cssSelectors, $htmlFragment, $message = '', $expected = true ) {
$document = $this->getDomDocumentFromHtmlFragment( $htmlFragment );
$xpath = new \DOMXPath( $document );
$converter = new CssSelectorConverter();
foreach ( $cssSelectors as $selector ) {
if ( is_array( $selector ) ) {
$expectedCount = array_pop( $selector );
$expectedCountText = ( ( $expected === true) ? '' : 'not ') . $expectedCount;
$selector = array_shift( $selector );
} else {
$expectedCount = false;
$expectedCountText = ( $expected === true) ? 'at least 1' : 'none';
}
$message = "Failed assertion for test case `{$message}` on: \n=====\n$htmlFragment\n=====\nExpected pattern: `$selector`\n";
try {
// Symfony\Component\CssSelector\Exception\SyntaxErrorException: Expected selector ...
$entries = $xpath->evaluate( $converter->toXPath( $selector ) );
$actualCount = $entries->length;
$message .= "Expected occurrences: {$expectedCountText}\nFound occurrences: {$actualCount}\n";
} catch ( \Exception $e ) {
$actualCount = 0;
$message .= "CssSelector: " . $e->getMessage();
}
self::assertTrue( ( ( $expectedCount === false && $actualCount > 0 ) || ( $actualCount === $expectedCount ) ) === $expected, $message );
}
}
/**
* @param string | string[] $cssSelectors
* @param string $htmlFragment
* @param string $message
*/
public function assertThatHtmlNotContains( $cssSelectors, $htmlFragment, $message = '' ) {
$this->assertThatHtmlContains( $cssSelectors, $htmlFragment, $message, false );
}
}
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