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<?php
namespace MediaWiki\Diff\TextDiffer;
use InvalidArgumentException;
use MediaWiki\Html\Html;
use MediaWiki\Output\OutputPage;
use MessageLocalizer;
/**
* The base class for specific implementations of TextDiffer, apart from
* ManifoldTextDiffer.
*
* A place for protected utility functions.
*
* @since 1.41
*/
abstract class BaseTextDiffer implements TextDiffer {
/** @var MessageLocalizer */
private $localizer;
public function setLocalizer(
MessageLocalizer $localizer
) {
$this->localizer = $localizer;
}
/**
* Provide a MessageLocalizer, or throw if setLocalizer() has not been called.
*/
protected function getLocalizer(): MessageLocalizer {
return $this->localizer;
}
public function hasFormat( string $format ): bool {
return in_array( $format, $this->getFormats(), true );
}
public function addRowWrapper( string $format, string $diffText ): string {
$context = $this->getFormatContext( $format );
if ( $context === self::CONTEXT_PLAIN ) {
return "<tr><td colspan=\"4\">$diffText</td></tr>";
} elseif ( $context === self::CONTEXT_PRE ) {
return '<tr><td colspan="4">' .
Html::element( 'pre', [], $diffText ) .
'</td></tr>';
} else {
return $diffText;
}
}
/**
* Throw an exception if any of the formats in the array is not supported.
*
* @param string[] $formats
*/
protected function validateFormats( $formats ) {
$badFormats = array_diff( $formats, $this->getFormats() );
if ( $badFormats ) {
throw new InvalidArgumentException( 'The requested format is not supported by this engine' );
}
}
public function render( string $oldText, string $newText, string $format ): string {
$result = $this->renderBatch( $oldText, $newText, [ $format ] );
return reset( $result );
}
public function renderBatch( string $oldText, string $newText, array $formats ): array {
$this->validateFormats( $formats );
if ( !count( $formats ) ) {
return [];
}
return $this->doRenderBatch( $oldText, $newText, $formats );
}
/**
* Subclasses should override this to render diffs in the specified formats.
* The $formats array is guaranteed to not be empty and to contain only
* formats supported by the subclass.
*
* @param string $oldText
* @param string $newText
* @param array $formats
* @return array
*/
abstract protected function doRenderBatch( string $oldText, string $newText, array $formats ): array;
public function addModules( OutputPage $out, string $format ): void {
}
public function getCacheKeys( array $formats ): array {
return [];
}
public function localize( string $format, string $diff, array $options = [] ): string {
return $diff;
}
public function getTablePrefixes( string $format ): array {
return [];
}
public function getPreferredFormatBatch( string $format ): array {
return [ $format ];
}
/**
* Replace a common convention for language-independent line numbers with
* the text in the language of the current localizer.
*
* @param string $text
* @param bool $reducedLineNumbers
*
* @return string
*/
protected function localizeLineNumbers(
$text, $reducedLineNumbers
) {
// Inline diffs.
$text = preg_replace_callback( '/<!-- LINES (\d+),(\d+) -->/',
function ( array $matches ) use ( $reducedLineNumbers ) {
if ( $matches[1] === '1' && $matches[2] === '1' && $reducedLineNumbers ) {
return '';
}
$msg = $matches[1] === $matches[2]
? 'lineno'
: 'lineno-inline';
return $this->getLocalizer()->msg( $msg )
->numParams( $matches[1], $matches[2] )
->escaped();
}, $text );
// Table diffs.
return preg_replace_callback( '/<!--LINE (\d+)-->/',
function ( array $matches ) use ( $reducedLineNumbers ) {
if ( $matches[1] === '1' && $reducedLineNumbers ) {
return '';
}
return $this->getLocalizer()->msg( 'lineno' )->numParams( $matches[1] )->escaped();
}, $text );
}
}