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<?php
namespace Flow\Parsoid;
use DOMDocument;
use DOMXPath;
use Flow\Exception\FlowException;
use Flow\Model\AbstractRevision;
use Flow\Model\PostRevision;
use Title;
class ContentFixer {
/**
* @var Fixer[] Array of Fixer objects
*/
protected $contentFixers = array();
/**
* Accepts multiple content fixers.
*
* @param Fixer $contentFixer...
* @throws FlowException When provided arguments are not an instance of Fixer
*/
public function __construct( Fixer $contentFixer /* [, Fixer $contentFixer2 [, ...]] */ ) {
$this->contentFixers = func_get_args();
// validate data
foreach ( $this->contentFixers as $contentFixer ) {
if ( !$contentFixer instanceof Fixer ) {
throw new FlowException( 'Invalid content fixer', 'default' );
}
}
}
/**
* @param AbstractRevision $revision
* @return string
*/
public function getContent( AbstractRevision $revision ) {
return $this->apply(
$revision->getContent( 'html' ),
$revision->getCollection()->getTitle()
);
}
/**
* Applies all contained content fixers to the provided HTML content.
* The resulting content is then suitible for display to the end user.
*
* @param string $content Html
* @param Title $title
* @return string Html
*/
public function apply( $content, Title $title ) {
$dom = self::createDOM( $content );
$xpath = new DOMXPath( $dom );
foreach ( $this->contentFixers as $i => $contentFixer ) {
$found = $xpath->query( $contentFixer->getXPath() );
if ( !$found ) {
wfDebugLog( 'Flow', __METHOD__ . ': Invalid XPath from ' . get_class( $contentFixer ) . ' of: ' . $contentFixer->getXPath() );
unset( $this->contentFixers[$i] );
continue;
}
foreach ( $found as $node ) {
$contentFixer->apply( $node, $title );
}
}
return Utils::getInnerHtml( $dom->getElementsByTagName( 'body' )->item( 0 ) );
}
/**
* creates a DOM with extra considerations for BC with
* previous parsoid content, and for encoding issues.
*
* @param string $content HTML from parsoid
* @return DOMDocument
*/
static public function createDOM( $content ) {
/*
* Workaround because DOMDocument can't guess charset.
* Content should be utf-8. Alternative "workarounds" would be to
* provide the charset in $response, as either:
* * <?xml encoding="utf-8" ?>
* * <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
* * mb_convert_encoding( $content, 'HTML-ENTITIES', 'UTF-8' );
*
* The body tag is required otherwise <meta> tags at the top are
* magic'd into <head> rather than kept with the content.
*/
if ( substr( $content, 0, 5 ) !== '<body' ) {
// BC: content currently comes from parsoid and is stored
// wrapped in <body> tags, but prior to I0d9659f we were
// storing only the contents and not the body tag itself.
$content = "<body>$content</body>";
}
return Utils::createDOM( '<?xml encoding="utf-8"?>' . $content );
}
}
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