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| 1 | <?php |
| 2 | |
| 3 | namespace Flow\Formatter; |
| 4 | |
| 5 | use DifferenceEngine; |
| 6 | use IContextSource; |
| 7 | use TextContent; |
| 8 | |
| 9 | class RevisionUndoViewFormatter { |
| 10 | /** @var RevisionViewFormatter */ |
| 11 | protected $revisionViewFormatter; |
| 12 | |
| 13 | public function __construct( RevisionViewFormatter $revisionViewFormatter ) { |
| 14 | $this->revisionViewFormatter = $revisionViewFormatter; |
| 15 | } |
| 16 | |
| 17 | /** |
| 18 | * Undoes the change that occurred between $start and $stop |
| 19 | * @param FormatterRow $start |
| 20 | * @param FormatterRow $stop |
| 21 | * @param FormatterRow $current |
| 22 | * @param IContextSource $context |
| 23 | * @return array |
| 24 | */ |
| 25 | public function formatApi( |
| 26 | FormatterRow $start, |
| 27 | FormatterRow $stop, |
| 28 | FormatterRow $current, |
| 29 | IContextSource $context |
| 30 | ) { |
| 31 | $currentWikitext = $current->revision->getContentInWikitext(); |
| 32 | |
| 33 | $undoContent = $this->getUndoContent( |
| 34 | $start->revision->getContentInWikitext(), |
| 35 | $stop->revision->getContentInWikitext(), |
| 36 | $currentWikitext |
| 37 | ); |
| 38 | |
| 39 | $differenceEngine = new DifferenceEngine(); |
| 40 | $differenceEngine->setContent( |
| 41 | new TextContent( $currentWikitext ), |
| 42 | new TextContent( $undoContent ) |
| 43 | ); |
| 44 | |
| 45 | $this->revisionViewFormatter->setContentFormat( 'wikitext' ); |
| 46 | |
| 47 | // @todo if stop === current we could do a little less processing |
| 48 | return [ |
| 49 | 'start' => $this->revisionViewFormatter->formatApi( $start, $context ), |
| 50 | 'stop' => $this->revisionViewFormatter->formatApi( $stop, $context ), |
| 51 | 'current' => $this->revisionViewFormatter->formatApi( $current, $context ), |
| 52 | 'undo' => [ |
| 53 | 'possible' => $undoContent !== false, |
| 54 | 'content' => $undoContent, |
| 55 | 'diff_content' => $differenceEngine->getDiffBody(), |
| 56 | ], |
| 57 | 'articleTitle' => $start->workflow->getArticleTitle(), |
| 58 | ]; |
| 59 | } |
| 60 | |
| 61 | protected function getUndoContent( $startContent, $stopContent, $currentContent ) { |
| 62 | if ( $currentContent === $stopContent ) { |
| 63 | return $startContent; |
| 64 | } else { |
| 65 | // 3-way merge |
| 66 | $ok = wfMerge( $stopContent, $startContent, $currentContent, $result ); |
| 67 | if ( $ok ) { |
| 68 | return $result; |
| 69 | } else { |
| 70 | return false; |
| 71 | } |
| 72 | } |
| 73 | } |
| 74 | } |