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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Diff\TextDiffer; |
| 4 | |
| 5 | use MediaWiki\Html\Html; |
| 6 | use TextSlotDiffRenderer; |
| 7 | |
| 8 | /** |
| 9 | * @since 1.41 |
| 10 | */ |
| 11 | class Wikidiff2TextDiffer extends BaseTextDiffer { |
| 12 | /** @var string */ |
| 13 | private $version; |
| 14 | /** @var bool */ |
| 15 | private $haveMoveSupport; |
| 16 | /** @var bool */ |
| 17 | private $haveMultiFormatSupport; |
| 18 | /** @var bool */ |
| 19 | private $haveCutoffParameter; |
| 20 | /** @var bool */ |
| 21 | private $useMultiFormat; |
| 22 | /** @var array */ |
| 23 | private $defaultOptions; |
| 24 | /** @var array[] */ |
| 25 | private $formatOptions; |
| 26 | /** @var string */ |
| 27 | private $optionsHash; |
| 28 | |
| 29 | private const OPT_NAMES = [ |
| 30 | 'numContextLines', |
| 31 | 'changeThreshold', |
| 32 | 'movedLineThreshold', |
| 33 | 'maxMovedLines', |
| 34 | 'maxWordLevelDiffComplexity', |
| 35 | 'maxSplitSize', |
| 36 | 'initialSplitThreshold', |
| 37 | 'finalSplitThreshold', |
| 38 | ]; |
| 39 | |
| 40 | /** |
| 41 | * Fake wikidiff2 extension version for PHPUnit testing |
| 42 | * @var string|null |
| 43 | */ |
| 44 | public static $fakeVersionForTesting = null; |
| 45 | |
| 46 | /** |
| 47 | * Determine whether the extension is installed (or mocked for testing) |
| 48 | * |
| 49 | * @return bool |
| 50 | */ |
| 51 | public static function isInstalled() { |
| 52 | return self::$fakeVersionForTesting !== null |
| 53 | || function_exists( 'wikidiff2_do_diff' ); |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * @param array $options |
| 58 | */ |
| 59 | public function __construct( $options ) { |
| 60 | $this->version = self::$fakeVersionForTesting ?? phpversion( 'wikidiff2' ); |
| 61 | $this->haveMoveSupport = version_compare( $this->version, '1.5.0', '>=' ); |
| 62 | $this->haveMultiFormatSupport = version_compare( $this->version, '1.14.0', '>=' ); |
| 63 | $this->haveCutoffParameter = $this->haveMoveSupport |
| 64 | && version_compare( $this->version, '1.8.0', '<' ); |
| 65 | |
| 66 | $this->useMultiFormat = $this->haveMultiFormatSupport && !empty( $options['useMultiFormat'] ); |
| 67 | $validOpts = array_fill_keys( self::OPT_NAMES, true ); |
| 68 | $this->defaultOptions = array_intersect_key( $options, $validOpts ); |
| 69 | $this->formatOptions = []; |
| 70 | foreach ( $options['formatOptions'] ?? [] as $format => $formatOptions ) { |
| 71 | $this->formatOptions[$format] = array_intersect_key( $formatOptions, $validOpts ); |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | public function getName(): string { |
| 76 | return 'wikidiff2'; |
| 77 | } |
| 78 | |
| 79 | public function getFormatContext( string $format ) { |
| 80 | return $format === 'inline' ? self::CONTEXT_PLAIN : self::CONTEXT_ROW; |
| 81 | } |
| 82 | |
| 83 | public function getCacheKeys( array $formats ): array { |
| 84 | return [ |
| 85 | '20-wikidiff2-version' => $this->version, |
| 86 | '21-wikidiff2-options' => $this->getOptionsHash(), |
| 87 | ]; |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Get a hash of the cache-varying constructor options |
| 92 | * |
| 93 | * @return string |
| 94 | */ |
| 95 | private function getOptionsHash() { |
| 96 | if ( $this->optionsHash === null ) { |
| 97 | $json = json_encode( |
| 98 | [ |
| 99 | $this->useMultiFormat, |
| 100 | $this->defaultOptions, |
| 101 | $this->formatOptions, |
| 102 | ], |
| 103 | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE |
| 104 | ); |
| 105 | $this->optionsHash = substr( md5( $json ), 0, 8 ); |
| 106 | } |
| 107 | return $this->optionsHash; |
| 108 | } |
| 109 | |
| 110 | public function doRenderBatch( string $oldText, string $newText, array $formats ): array { |
| 111 | if ( $this->useMultiFormat ) { |
| 112 | if ( !$this->formatOptions ) { |
| 113 | /** @var array $result */ |
| 114 | $result = wikidiff2_multi_format_diff( |
| 115 | $oldText, |
| 116 | $newText, |
| 117 | [ 'formats' => $formats ] + $this->defaultOptions |
| 118 | ); |
| 119 | } else { |
| 120 | $result = []; |
| 121 | foreach ( $formats as $format ) { |
| 122 | $result[$format] = wikidiff2_multi_format_diff( |
| 123 | $oldText, |
| 124 | $newText, |
| 125 | [ 'formats' => $formats ] |
| 126 | + ( $this->formatOptions[$format] ?? [] ) |
| 127 | + $this->defaultOptions |
| 128 | ); |
| 129 | } |
| 130 | } |
| 131 | } else { |
| 132 | $result = []; |
| 133 | foreach ( $formats as $format ) { |
| 134 | switch ( $format ) { |
| 135 | case 'table': |
| 136 | $result['table'] = $this->doTableFormat( $oldText, $newText ); |
| 137 | break; |
| 138 | |
| 139 | case 'inline': |
| 140 | $result['inline'] = $this->doInlineFormat( $oldText, $newText ); |
| 141 | break; |
| 142 | } |
| 143 | } |
| 144 | } |
| 145 | return $result; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Do a table format diff |
| 150 | * |
| 151 | * @param string $old |
| 152 | * @param string $new |
| 153 | * @return string |
| 154 | */ |
| 155 | private function doTableFormat( $old, $new ) { |
| 156 | if ( $this->haveCutoffParameter ) { |
| 157 | return wikidiff2_do_diff( |
| 158 | $old, |
| 159 | $new, |
| 160 | 2, |
| 161 | 0 |
| 162 | ); |
| 163 | } else { |
| 164 | // Don't pass the 4th parameter introduced in version 1.5.0 and removed in version 1.8.0 |
| 165 | return wikidiff2_do_diff( |
| 166 | $old, |
| 167 | $new, |
| 168 | 2 |
| 169 | ); |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * Do an inline format diff |
| 175 | * |
| 176 | * @param string $oldText |
| 177 | * @param string $newText |
| 178 | * @return string |
| 179 | */ |
| 180 | private function doInlineFormat( $oldText, $newText ) { |
| 181 | return wikidiff2_inline_diff( $oldText, $newText, 2 ); |
| 182 | } |
| 183 | |
| 184 | public function getFormats(): array { |
| 185 | return [ 'table', 'inline' ]; |
| 186 | } |
| 187 | |
| 188 | public function getTablePrefixes( string $format ): array { |
| 189 | $localizer = $this->getLocalizer(); |
| 190 | $ins = Html::element( 'span', |
| 191 | [ 'class' => 'mw-diff-inline-legend-ins' ], |
| 192 | $localizer->msg( 'diff-inline-tooltip-ins' )->plain() |
| 193 | ); |
| 194 | $del = Html::element( 'span', |
| 195 | [ 'class' => 'mw-diff-inline-legend-del' ], |
| 196 | $localizer->msg( 'diff-inline-tooltip-del' )->plain() |
| 197 | ); |
| 198 | $hideDiffClass = $format === 'inline' ? '' : 'oo-ui-element-hidden'; |
| 199 | $legend = Html::rawElement( 'div', |
| 200 | [ 'class' => 'mw-diff-inline-legend ' . $hideDiffClass ], "$del $ins" |
| 201 | ); |
| 202 | return [ TextSlotDiffRenderer::INLINE_LEGEND_KEY => $legend ]; |
| 203 | } |
| 204 | |
| 205 | public function localize( string $format, string $diff, array $options = [] ): string { |
| 206 | $diff = $this->localizeLineNumbers( $diff, |
| 207 | $options['reducedLineNumbers'] ?? false |
| 208 | ); |
| 209 | if ( $this->haveMoveSupport ) { |
| 210 | $diff = $this->addLocalizedTitleTooltips( $format, $diff ); |
| 211 | } |
| 212 | return $diff; |
| 213 | } |
| 214 | |
| 215 | /** |
| 216 | * Add title attributes for tooltips on various diff elements |
| 217 | * |
| 218 | * @param string $format |
| 219 | * @param string $text |
| 220 | * @return string |
| 221 | */ |
| 222 | private function addLocalizedTitleTooltips( $format, $text ) { |
| 223 | // Moved paragraph indicators. |
| 224 | $localizer = $this->getLocalizer(); |
| 225 | $replacements = [ |
| 226 | 'class="mw-diff-movedpara-right"' => |
| 227 | 'class="mw-diff-movedpara-right" title="' . |
| 228 | $localizer->msg( 'diff-paragraph-moved-toold' )->escaped() . '"', |
| 229 | 'class="mw-diff-movedpara-left"' => |
| 230 | 'class="mw-diff-movedpara-left" title="' . |
| 231 | $localizer->msg( 'diff-paragraph-moved-tonew' )->escaped() . '"', |
| 232 | ]; |
| 233 | // For inline diffs, add tooltips to `<ins>` and `<del>`. |
| 234 | if ( $format == 'inline' ) { |
| 235 | $replacements['<ins>'] = Html::openElement( 'ins', |
| 236 | [ 'title' => $localizer->msg( 'diff-inline-tooltip-ins' )->plain() ] ); |
| 237 | $replacements['<del>'] = Html::openElement( 'del', |
| 238 | [ 'title' => $localizer->msg( 'diff-inline-tooltip-del' )->plain() ] ); |
| 239 | } |
| 240 | return strtr( $text, $replacements ); |
| 241 | } |
| 242 | |
| 243 | public function getPreferredFormatBatch( string $format ): array { |
| 244 | if ( $this->formatOptions ) { |
| 245 | return [ $format ]; |
| 246 | } else { |
| 247 | return [ 'table', 'inline' ]; |
| 248 | } |
| 249 | } |
| 250 | } |