mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Echo
synced 2024-12-21 04:03:40 +00:00
116 lines
3 KiB
PHP
116 lines
3 KiB
PHP
<?php
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/**
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* MediaWiki Extension: Echo
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* This program is distributed WITHOUT ANY WARRANTY.
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*/
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/**
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* @file
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* @ingroup Extensions
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* @author Erik Bernhardson
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*/
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/**
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* Represents a single set of changes all effecting neighboring lines
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*/
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class EchoDiffGroup {
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/**
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* @var int[] The left and right position this change starts at
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*/
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protected $position;
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/**
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* @var string[] The lines that have been added
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*/
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protected $new = [];
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/**
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* @var string[] The lines that have been removed
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*/
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protected $old = [];
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/**
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* @param int $leftPos The starting line number in the left text
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* @param int $rightPos The starting line number in the right text
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*/
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public function __construct( $leftPos, $rightPos ) {
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// +1 due to the original code use 1 indexing for this result
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$this->position = [
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'right-pos' => $rightPos + 1,
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'left-pos' => $leftPos + 1,
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];
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}
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/**
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* @param string $line Line in the right text but not in the left
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*/
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public function add( $line ) {
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$this->new[] = $line;
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}
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/**
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* @param string $line Line in the left text but not in the right
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*/
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public function subtract( $line ) {
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$this->old[] = $line;
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}
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/**
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* @return array[] set of changes
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* Each change consists of:
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* An 'action', one of:
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* - add
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* - subtract
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* - change
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* 'content' that was added or removed, or in the case
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* of a change, 'old_content' and 'new_content'
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* 'left_pos' and 'right_pos' (in 1-indexed lines) of the change.
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*/
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public function getChangeSet() {
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$old = implode( "\n", $this->old );
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$new = implode( "\n", $this->new );
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$position = $this->position;
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$changeSet = [];
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// The implodes must come first because we consider array( '' ) to also be false
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// meaning a blank link replaced with content is an addition
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if ( $old && $new ) {
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$min = min( count( $this->old ), count( $this->new ) );
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$changeSet[] = $position + [
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'action' => 'change',
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'old_content' => implode( "\n", array_slice( $this->old, 0, $min ) ),
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'new_content' => implode( "\n", array_slice( $this->new, 0, $min ) ),
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];
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$position['left-pos'] += $min;
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$position['right-pos'] += $min;
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$old = implode( "\n", array_slice( $this->old, $min ) );
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$new = implode( "\n", array_slice( $this->new, $min ) );
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}
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if ( $new ) {
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$changeSet[] = $position + [
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'action' => 'add',
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'content' => $new,
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];
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} elseif ( $old ) {
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$changeSet[] = $position + [
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'action' => 'subtract',
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'content' => $old,
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];
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}
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return $changeSet;
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}
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}
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