249 lines
8.2 KiB
PHP
249 lines
8.2 KiB
PHP
<?php
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/**
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* Parses unified or context diffs output from eg. the diff utility.
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*
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* Example:
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* <code>
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* $patch = file_get_contents('example.patch');
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* $diff = new Text_Diff('string', array($patch));
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* $renderer = new Text_Diff_Renderer_inline();
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* echo $renderer->render($diff);
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* </code>
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*
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* Copyright 2005 Örjan Persson <o@42mm.org>
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* Copyright 2005-2010 The Horde Project (http://www.horde.org/)
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*
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* See the enclosed file COPYING for license information (LGPL). If you did
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* not receive this file, see https://opensource.org/license/lgpl-2-1/.
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*
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* @author Örjan Persson <o@42mm.org>
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* @package Text_Diff
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* @since 0.2.0
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*/
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class Text_Diff_Engine_string {
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/**
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* Parses a unified or context diff.
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*
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* First param contains the whole diff and the second can be used to force
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* a specific diff type. If the second parameter is 'autodetect', the
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* diff will be examined to find out which type of diff this is.
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*
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* @param string $diff The diff content.
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* @param string $mode The diff mode of the content in $diff. One of
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* 'context', 'unified', or 'autodetect'.
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*
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* @return array List of all diff operations.
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*/
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function diff($diff, $mode = 'autodetect')
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{
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// Detect line breaks.
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$lnbr = "\n";
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if (strpos($diff, "\r\n") !== false) {
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$lnbr = "\r\n";
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} elseif (strpos($diff, "\r") !== false) {
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$lnbr = "\r";
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}
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// Make sure we have a line break at the EOF.
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if (substr($diff, -strlen($lnbr)) != $lnbr) {
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$diff .= $lnbr;
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}
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if ($mode != 'autodetect' && $mode != 'context' && $mode != 'unified') {
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return PEAR::raiseError('Type of diff is unsupported');
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}
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if ($mode == 'autodetect') {
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$context = strpos($diff, '***');
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$unified = strpos($diff, '---');
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if ($context === $unified) {
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return PEAR::raiseError('Type of diff could not be detected');
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} elseif ($context === false || $unified === false) {
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$mode = $context !== false ? 'context' : 'unified';
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} else {
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$mode = $context < $unified ? 'context' : 'unified';
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}
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}
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// Split by new line and remove the diff header, if there is one.
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$diff = explode($lnbr, $diff);
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if (($mode == 'context' && strpos($diff[0], '***') === 0) ||
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($mode == 'unified' && strpos($diff[0], '---') === 0)) {
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array_shift($diff);
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array_shift($diff);
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}
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if ($mode == 'context') {
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return $this->parseContextDiff($diff);
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} else {
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return $this->parseUnifiedDiff($diff);
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}
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}
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/**
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* Parses an array containing the unified diff.
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*
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* @param array $diff Array of lines.
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*
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* @return array List of all diff operations.
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*/
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function parseUnifiedDiff($diff)
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{
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$edits = array();
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$end = count($diff) - 1;
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for ($i = 0; $i < $end;) {
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$diff1 = array();
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switch (substr($diff[$i], 0, 1)) {
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case ' ':
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do {
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$diff1[] = substr($diff[$i], 1);
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} while (++$i < $end && substr($diff[$i], 0, 1) == ' ');
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$edits[] = new Text_Diff_Op_copy($diff1);
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break;
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case '+':
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// get all new lines
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do {
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$diff1[] = substr($diff[$i], 1);
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} while (++$i < $end && substr($diff[$i], 0, 1) == '+');
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$edits[] = new Text_Diff_Op_add($diff1);
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break;
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case '-':
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// get changed or removed lines
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$diff2 = array();
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do {
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$diff1[] = substr($diff[$i], 1);
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} while (++$i < $end && substr($diff[$i], 0, 1) == '-');
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while ($i < $end && substr($diff[$i], 0, 1) == '+') {
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$diff2[] = substr($diff[$i++], 1);
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}
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if (count($diff2) == 0) {
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$edits[] = new Text_Diff_Op_delete($diff1);
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} else {
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$edits[] = new Text_Diff_Op_change($diff1, $diff2);
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}
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break;
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default:
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$i++;
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break;
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}
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}
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return $edits;
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}
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/**
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* Parses an array containing the context diff.
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*
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* @param array $diff Array of lines.
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*
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* @return array List of all diff operations.
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*/
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function parseContextDiff(&$diff)
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{
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$edits = array();
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$i = $max_i = $j = $max_j = 0;
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$end = count($diff) - 1;
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while ($i < $end && $j < $end) {
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while ($i >= $max_i && $j >= $max_j) {
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// Find the boundaries of the diff output of the two files
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for ($i = $j;
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$i < $end && substr($diff[$i], 0, 3) == '***';
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$i++);
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for ($max_i = $i;
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$max_i < $end && substr($diff[$max_i], 0, 3) != '---';
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$max_i++);
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for ($j = $max_i;
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$j < $end && substr($diff[$j], 0, 3) == '---';
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$j++);
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for ($max_j = $j;
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$max_j < $end && substr($diff[$max_j], 0, 3) != '***';
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$max_j++);
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}
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// find what hasn't been changed
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$array = array();
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while ($i < $max_i &&
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$j < $max_j &&
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strcmp($diff[$i], $diff[$j]) == 0) {
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$array[] = substr($diff[$i], 2);
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$i++;
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$j++;
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}
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while ($i < $max_i && ($max_j-$j) <= 1) {
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if ($diff[$i] != '' && substr($diff[$i], 0, 1) != ' ') {
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break;
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}
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$array[] = substr($diff[$i++], 2);
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}
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while ($j < $max_j && ($max_i-$i) <= 1) {
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if ($diff[$j] != '' && substr($diff[$j], 0, 1) != ' ') {
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break;
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}
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$array[] = substr($diff[$j++], 2);
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}
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if (count($array) > 0) {
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$edits[] = new Text_Diff_Op_copy($array);
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}
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if ($i < $max_i) {
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$diff1 = array();
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switch (substr($diff[$i], 0, 1)) {
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case '!':
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$diff2 = array();
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do {
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$diff1[] = substr($diff[$i], 2);
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if ($j < $max_j && substr($diff[$j], 0, 1) == '!') {
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$diff2[] = substr($diff[$j++], 2);
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}
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} while (++$i < $max_i && substr($diff[$i], 0, 1) == '!');
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$edits[] = new Text_Diff_Op_change($diff1, $diff2);
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break;
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case '+':
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do {
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$diff1[] = substr($diff[$i], 2);
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} while (++$i < $max_i && substr($diff[$i], 0, 1) == '+');
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$edits[] = new Text_Diff_Op_add($diff1);
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break;
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case '-':
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do {
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$diff1[] = substr($diff[$i], 2);
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} while (++$i < $max_i && substr($diff[$i], 0, 1) == '-');
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$edits[] = new Text_Diff_Op_delete($diff1);
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break;
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}
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}
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if ($j < $max_j) {
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$diff2 = array();
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switch (substr($diff[$j], 0, 1)) {
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case '+':
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do {
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$diff2[] = substr($diff[$j++], 2);
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} while ($j < $max_j && substr($diff[$j], 0, 1) == '+');
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$edits[] = new Text_Diff_Op_add($diff2);
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break;
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case '-':
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do {
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$diff2[] = substr($diff[$j++], 2);
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} while ($j < $max_j && substr($diff[$j], 0, 1) == '-');
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$edits[] = new Text_Diff_Op_delete($diff2);
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break;
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}
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}
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}
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return $edits;
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}
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}
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