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<?php
namespace MediaWiki\Diff\TextDiffer;
use MediaWiki\Html\Html;
use TextSlotDiffRenderer;
/**
* @since 1.41
*/
class Wikidiff2TextDiffer extends BaseTextDiffer {
/** @var string */
private $version;
/** @var bool */
private $haveMoveSupport;
/** @var bool */
private $haveMultiFormatSupport;
/** @var bool */
private $haveCutoffParameter;
/** @var bool */
private $useMultiFormat;
/** @var array */
private $defaultOptions;
/** @var array[] */
private $formatOptions;
/** @var string */
private $optionsHash;
private const OPT_NAMES = [
'numContextLines',
'changeThreshold',
'movedLineThreshold',
'maxMovedLines',
'maxWordLevelDiffComplexity',
'maxSplitSize',
'initialSplitThreshold',
'finalSplitThreshold',
];
/**
* Fake wikidiff2 extension version for PHPUnit testing
* @var string|null
*/
public static $fakeVersionForTesting = null;
/**
* Determine whether the extension is installed (or mocked for testing)
*
* @return bool
*/
public static function isInstalled() {
return self::$fakeVersionForTesting !== null
|| function_exists( 'wikidiff2_do_diff' );
}
/**
* @param array $options
*/
public function __construct( $options ) {
$this->version = self::$fakeVersionForTesting ?? phpversion( 'wikidiff2' );
$this->haveMoveSupport = version_compare( $this->version, '1.5.0', '>=' );
$this->haveMultiFormatSupport = version_compare( $this->version, '1.14.0', '>=' );
$this->haveCutoffParameter = $this->haveMoveSupport
&& version_compare( $this->version, '1.8.0', '<' );
$this->useMultiFormat = $this->haveMultiFormatSupport && !empty( $options['useMultiFormat'] );
$validOpts = array_fill_keys( self::OPT_NAMES, true );
$this->defaultOptions = array_intersect_key( $options, $validOpts );
$this->formatOptions = [];
foreach ( $options['formatOptions'] ?? [] as $format => $formatOptions ) {
$this->formatOptions[$format] = array_intersect_key( $formatOptions, $validOpts );
}
}
public function getName(): string {
return 'wikidiff2';
}
public function getFormatContext( string $format ) {
return $format === 'inline' ? self::CONTEXT_PLAIN : self::CONTEXT_ROW;
}
public function getCacheKeys( array $formats ): array {
return [
'20-wikidiff2-version' => $this->version,
'21-wikidiff2-options' => $this->getOptionsHash(),
];
}
/**
* Get a hash of the cache-varying constructor options
*
* @return string
*/
private function getOptionsHash() {
if ( $this->optionsHash === null ) {
$json = json_encode(
[
$this->useMultiFormat,
$this->defaultOptions,
$this->formatOptions,
],
JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE
);
$this->optionsHash = substr( md5( $json ), 0, 8 );
}
return $this->optionsHash;
}
public function doRenderBatch( string $oldText, string $newText, array $formats ): array {
if ( $this->useMultiFormat ) {
if ( !$this->formatOptions ) {
/** @var array $result */
$result = wikidiff2_multi_format_diff(
$oldText,
$newText,
[ 'formats' => $formats ] + $this->defaultOptions
);
} else {
$result = [];
foreach ( $formats as $format ) {
$result[$format] = wikidiff2_multi_format_diff(
$oldText,
$newText,
[ 'formats' => $formats ]
+ ( $this->formatOptions[$format] ?? [] )
+ $this->defaultOptions
);
}
}
} else {
$result = [];
foreach ( $formats as $format ) {
switch ( $format ) {
case 'table':
$result['table'] = $this->doTableFormat( $oldText, $newText );
break;
case 'inline':
$result['inline'] = $this->doInlineFormat( $oldText, $newText );
break;
}
}
}
return $result;
}
/**
* Do a table format diff
*
* @param string $old
* @param string $new
* @return string
*/
private function doTableFormat( $old, $new ) {
if ( $this->haveCutoffParameter ) {
return wikidiff2_do_diff(
$old,
$new,
2,
0
);
} else {
// Don't pass the 4th parameter introduced in version 1.5.0 and removed in version 1.8.0
return wikidiff2_do_diff(
$old,
$new,
2
);
}
}
/**
* Do an inline format diff
*
* @param string $oldText
* @param string $newText
* @return string
*/
private function doInlineFormat( $oldText, $newText ) {
return wikidiff2_inline_diff( $oldText, $newText, 2 );
}
public function getFormats(): array {
return [ 'table', 'inline' ];
}
public function getTablePrefixes( string $format ): array {
$localizer = $this->getLocalizer();
$ins = Html::element( 'span',
[ 'class' => 'mw-diff-inline-legend-ins' ],
$localizer->msg( 'diff-inline-tooltip-ins' )->plain()
);
$del = Html::element( 'span',
[ 'class' => 'mw-diff-inline-legend-del' ],
$localizer->msg( 'diff-inline-tooltip-del' )->plain()
);
$hideDiffClass = $format === 'inline' ? '' : 'oo-ui-element-hidden';
$legend = Html::rawElement( 'div',
[ 'class' => 'mw-diff-inline-legend ' . $hideDiffClass ], "$del $ins"
);
return [ TextSlotDiffRenderer::INLINE_LEGEND_KEY => $legend ];
}
public function localize( string $format, string $diff, array $options = [] ): string {
$diff = $this->localizeLineNumbers( $diff,
$options['reducedLineNumbers'] ?? false
);
if ( $this->haveMoveSupport ) {
$diff = $this->addLocalizedTitleTooltips( $format, $diff );
}
return $diff;
}
/**
* Add title attributes for tooltips on various diff elements
*
* @param string $format
* @param string $text
* @return string
*/
private function addLocalizedTitleTooltips( $format, $text ) {
// Moved paragraph indicators.
$localizer = $this->getLocalizer();
$replacements = [
'class="mw-diff-movedpara-right"' =>
'class="mw-diff-movedpara-right" title="' .
$localizer->msg( 'diff-paragraph-moved-toold' )->escaped() . '"',
'class="mw-diff-movedpara-left"' =>
'class="mw-diff-movedpara-left" title="' .
$localizer->msg( 'diff-paragraph-moved-tonew' )->escaped() . '"',
];
// For inline diffs, add tooltips to `<ins>` and `<del>`.
if ( $format == 'inline' ) {
$replacements['<ins>'] = Html::openElement( 'ins',
[ 'title' => $localizer->msg( 'diff-inline-tooltip-ins' )->plain() ] );
$replacements['<del>'] = Html::openElement( 'del',
[ 'title' => $localizer->msg( 'diff-inline-tooltip-del' )->plain() ] );
}
return strtr( $text, $replacements );
}
public function getPreferredFormatBatch( string $format ): array {
if ( $this->formatOptions ) {
return [ $format ];
} else {
return [ 'table', 'inline' ];
}
}
}