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Edit File : string.php \| Size : 8.15 KB
<?php /** * Parses unified or context diffs output from eg. the diff utility. * * Example: * <code> * $patch = file_get_contents('example.patch'); * $diff = new Text_Diff('string', array($patch)); * $renderer = new Text_Diff_Renderer_inline(); * echo $renderer->render($diff); * </code> * * Copyright 2005 Örjan Persson <o@42mm.org> * Copyright 2005-2010 The Horde Project (http://www.horde.org/) * * See the enclosed file COPYING for license information (LGPL). If you did * not receive this file, see https://opensource.org/license/lgpl-2-1/. * * @author Örjan Persson <o@42mm.org> * @package Text_Diff * @since 0.2.0 / class Text_Diff_Engine_string { /* * Parses a unified or context diff. * * First param contains the whole diff and the second can be used to force * a specific diff type. If the second parameter is 'autodetect', the * diff will be examined to find out which type of diff this is. * * @param string $diff The diff content. * @param string $mode The diff mode of the content in $diff. One of * 'context', 'unified', or 'autodetect'. * * @return array List of all diff operations. / function diff($diff, $mode = 'autodetect') { // Detect line breaks. $lnbr = "\n"; if (strpos($diff, "\r\n") !== false) { $lnbr = "\r\n"; } elseif (strpos($diff, "\r") !== false) { $lnbr = "\r"; } // Make sure we have a line break at the EOF. if (substr($diff, -strlen($lnbr)) != $lnbr) { $diff .= $lnbr; } if ($mode != 'autodetect' && $mode != 'context' && $mode != 'unified') { return PEAR::raiseError('Type of diff is unsupported'); } if ($mode == 'autodetect') { $context = strpos($diff, ''); $unified = strpos($diff, '---'); if ($context === $unified) { return PEAR::raiseError('Type of diff could not be detected'); } elseif ($context === false \|\| $unified === false) { $mode = $context !== false ? 'context' : 'unified'; } else { $mode = $context < $unified ? 'context' : 'unified'; } } // Split by new line and remove the diff header, if there is one. $diff = explode($lnbr, $diff); if (($mode == 'context' && strpos($diff[0], '') === 0) \|\| ($mode == 'unified' && strpos($diff[0], '---') === 0)) { array_shift($diff); array_shift($diff); } if ($mode == 'context') { return $this->parseContextDiff($diff); } else { return $this->parseUnifiedDiff($diff); } } /* * Parses an array containing the unified diff. * * @param array $diff Array of lines. * * @return array List of all diff operations. / function parseUnifiedDiff($diff) { $edits = array(); $end = count($diff) - 1; for ($i = 0; $i < $end;) { $diff1 = array(); switch (substr($diff[$i], 0, 1)) { case ' ': do { $diff1[] = substr($diff[$i], 1); } while (++$i < $end && substr($diff[$i], 0, 1) == ' '); $edits[] = new Text_Diff_Op_copy($diff1); break; case '+': // get all new lines do { $diff1[] = substr($diff[$i], 1); } while (++$i < $end && substr($diff[$i], 0, 1) == '+'); $edits[] = new Text_Diff_Op_add($diff1); break; case '-': // get changed or removed lines $diff2 = array(); do { $diff1[] = substr($diff[$i], 1); } while (++$i < $end && substr($diff[$i], 0, 1) == '-'); while ($i < $end && substr($diff[$i], 0, 1) == '+') { $diff2[] = substr($diff[$i++], 1); } if (count($diff2) == 0) { $edits[] = new Text_Diff_Op_delete($diff1); } else { $edits[] = new Text_Diff_Op_change($diff1, $diff2); } break; default: $i++; break; } } return $edits; } /* * Parses an array containing the context diff. * * @param array $diff Array of lines. * * @return array List of all diff operations. / function parseContextDiff(&$diff) { $edits = array(); $i = $max_i = $j = $max_j = 0; $end = count($diff) - 1; while ($i < $end && $j < $end) { while ($i >= $max_i && $j >= $max_j) { // Find the boundaries of the diff output of the two files for ($i = $j; $i < $end && substr($diff[$i], 0, 3) == ''; $i++); for ($max_i = $i; $max_i < $end && substr($diff[$max_i], 0, 3) != '---'; $max_i++); for ($j = $max_i; $j < $end && substr($diff[$j], 0, 3) == '---'; $j++); for ($max_j = $j; $max_j < $end && substr($diff[$max_j], 0, 3) != '*'; $max_j++); } // find what hasn't been changed $array = array(); while ($i < $max_i && $j < $max_j && strcmp($diff[$i], $diff[$j]) == 0) { $array[] = substr($diff[$i], 2); $i++; $j++; } while ($i < $max_i && ($max_j-$j) <= 1) { if ($diff[$i] != '' && substr($diff[$i], 0, 1) != ' ') { break; } $array[] = substr($diff[$i++], 2); } while ($j < $max_j && ($max_i-$i) <= 1) { if ($diff[$j] != '' && substr($diff[$j], 0, 1) != ' ') { break; } $array[] = substr($diff[$j++], 2); } if (count($array) > 0) { $edits[] = new Text_Diff_Op_copy($array); } if ($i < $max_i) { $diff1 = array(); switch (substr($diff[$i], 0, 1)) { case '!': $diff2 = array(); do { $diff1[] = substr($diff[$i], 2); if ($j < $max_j && substr($diff[$j], 0, 1) == '!') { $diff2[] = substr($diff[$j++], 2); } } while (++$i < $max_i && substr($diff[$i], 0, 1) == '!'); $edits[] = new Text_Diff_Op_change($diff1, $diff2); break; case '+': do { $diff1[] = substr($diff[$i], 2); } while (++$i < $max_i && substr($diff[$i], 0, 1) == '+'); $edits[] = new Text_Diff_Op_add($diff1); break; case '-': do { $diff1[] = substr($diff[$i], 2); } while (++$i < $max_i && substr($diff[$i], 0, 1) == '-'); $edits[] = new Text_Diff_Op_delete($diff1); break; } } if ($j < $max_j) { $diff2 = array(); switch (substr($diff[$j], 0, 1)) { case '+': do { $diff2[] = substr($diff[$j++], 2); } while ($j < $max_j && substr($diff[$j], 0, 1) == '+'); $edits[] = new Text_Diff_Op_add($diff2); break; case '-': do { $diff2[] = substr($diff[$j++], 2); } while ($j < $max_j && substr($diff[$j], 0, 1) == '-'); $edits[] = new Text_Diff_Op_delete($diff2); break; } } } return $edits; } } Back

Edit File : string.php | Size : 8.15 KB

<?php
/**
 * Parses unified or context diffs output from eg. the diff utility.
 *
 * Example:
 * <code>
 * $patch = file_get_contents('example.patch');
 * $diff = new Text_Diff('string', array($patch));
 * $renderer = new Text_Diff_Renderer_inline();
 * echo $renderer->render($diff);
 * </code>
 *
 * Copyright 2005 Örjan Persson <o@42mm.org>
 * Copyright 2005-2010 The Horde Project (http://www.horde.org/)
 *
 * See the enclosed file COPYING for license information (LGPL). If you did
 * not receive this file, see https://opensource.org/license/lgpl-2-1/.
 *
 * @author  Örjan Persson <o@42mm.org>
 * @package Text_Diff
 * @since   0.2.0
 */
class Text_Diff_Engine_string {

/**
     * Parses a unified or context diff.
     *
     * First param contains the whole diff and the second can be used to force
     * a specific diff type. If the second parameter is 'autodetect', the
     * diff will be examined to find out which type of diff this is.
     *
     * @param string $diff  The diff content.
     * @param string $mode  The diff mode of the content in $diff. One of
     *                      'context', 'unified', or 'autodetect'.
     *
     * @return array  List of all diff operations.
     */
    function diff($diff, $mode = 'autodetect')
    {
        // Detect line breaks.
        $lnbr = "\n";
        if (strpos($diff, "\r\n") !== false) {
            $lnbr = "\r\n";
        } elseif (strpos($diff, "\r") !== false) {
            $lnbr = "\r";
        }

// Make sure we have a line break at the EOF.
        if (substr($diff, -strlen($lnbr)) != $lnbr) {
            $diff .= $lnbr;
        }

if ($mode != 'autodetect' && $mode != 'context' && $mode != 'unified') {
            return PEAR::raiseError('Type of diff is unsupported');
        }

if ($mode == 'autodetect') {
            $context = strpos($diff, '***');
            $unified = strpos($diff, '---');
            if ($context === $unified) {
                return PEAR::raiseError('Type of diff could not be detected');
            } elseif ($context === false || $unified === false) {
                $mode = $context !== false ? 'context' : 'unified';
            } else {
                $mode = $context < $unified ? 'context' : 'unified';
            }
        }

// Split by new line and remove the diff header, if there is one.
        $diff = explode($lnbr, $diff);
        if (($mode == 'context' && strpos($diff[0], '***') === 0) ||
            ($mode == 'unified' && strpos($diff[0], '---') === 0)) {
            array_shift($diff);
            array_shift($diff);
        }

if ($mode == 'context') {
            return $this->parseContextDiff($diff);
        } else {
            return $this->parseUnifiedDiff($diff);
        }
    }

/**
     * Parses an array containing the unified diff.
     *
     * @param array $diff  Array of lines.
     *
     * @return array  List of all diff operations.
     */
    function parseUnifiedDiff($diff)
    {
        $edits = array();
        $end = count($diff) - 1;
        for ($i = 0; $i < $end;) {
            $diff1 = array();
            switch (substr($diff[$i], 0, 1)) {
            case ' ':
                do {
                    $diff1[] = substr($diff[$i], 1);
                } while (++$i < $end && substr($diff[$i], 0, 1) == ' ');
                $edits[] = new Text_Diff_Op_copy($diff1);
                break;

case '+':
                // get all new lines
                do {
                    $diff1[] = substr($diff[$i], 1);
                } while (++$i < $end && substr($diff[$i], 0, 1) == '+');
                $edits[] = new Text_Diff_Op_add($diff1);
                break;

case '-':
                // get changed or removed lines
                $diff2 = array();
                do {
                    $diff1[] = substr($diff[$i], 1);
                } while (++$i < $end && substr($diff[$i], 0, 1) == '-');

while ($i < $end && substr($diff[$i], 0, 1) == '+') {
                    $diff2[] = substr($diff[$i++], 1);
                }
                if (count($diff2) == 0) {
                    $edits[] = new Text_Diff_Op_delete($diff1);
                } else {
                    $edits[] = new Text_Diff_Op_change($diff1, $diff2);
                }
                break;

default:
                $i++;
                break;
            }
        }

return $edits;
    }

/**
     * Parses an array containing the context diff.
     *
     * @param array $diff  Array of lines.
     *
     * @return array  List of all diff operations.
     */
    function parseContextDiff(&$diff)
    {
        $edits = array();
        $i = $max_i = $j = $max_j = 0;
        $end = count($diff) - 1;
        while ($i < $end && $j < $end) {
            while ($i >= $max_i && $j >= $max_j) {
                // Find the boundaries of the diff output of the two files
                for ($i = $j;
                     $i < $end && substr($diff[$i], 0, 3) == '***';
                     $i++);
                for ($max_i = $i;
                     $max_i < $end && substr($diff[$max_i], 0, 3) != '---';
                     $max_i++);
                for ($j = $max_i;
                     $j < $end && substr($diff[$j], 0, 3) == '---';
                     $j++);
                for ($max_j = $j;
                     $max_j < $end && substr($diff[$max_j], 0, 3) != '***';
                     $max_j++);
            }

// find what hasn't been changed
            $array = array();
            while ($i < $max_i &&
                   $j < $max_j &&
                   strcmp($diff[$i], $diff[$j]) == 0) {
                $array[] = substr($diff[$i], 2);
                $i++;
                $j++;
            }

while ($i < $max_i && ($max_j-$j) <= 1) {
                if ($diff[$i] != '' && substr($diff[$i], 0, 1) != ' ') {
                    break;
                }
                $array[] = substr($diff[$i++], 2);
            }

while ($j < $max_j && ($max_i-$i) <= 1) {
                if ($diff[$j] != '' && substr($diff[$j], 0, 1) != ' ') {
                    break;
                }
                $array[] = substr($diff[$j++], 2);
            }
            if (count($array) > 0) {
                $edits[] = new Text_Diff_Op_copy($array);
            }

if ($i < $max_i) {
                $diff1 = array();
                switch (substr($diff[$i], 0, 1)) {
                case '!':
                    $diff2 = array();
                    do {
                        $diff1[] = substr($diff[$i], 2);
                        if ($j < $max_j && substr($diff[$j], 0, 1) == '!') {
                            $diff2[] = substr($diff[$j++], 2);
                        }
                    } while (++$i < $max_i && substr($diff[$i], 0, 1) == '!');
                    $edits[] = new Text_Diff_Op_change($diff1, $diff2);
                    break;

case '+':
                    do {
                        $diff1[] = substr($diff[$i], 2);
                    } while (++$i < $max_i && substr($diff[$i], 0, 1) == '+');
                    $edits[] = new Text_Diff_Op_add($diff1);
                    break;

case '-':
                    do {
                        $diff1[] = substr($diff[$i], 2);
                    } while (++$i < $max_i && substr($diff[$i], 0, 1) == '-');
                    $edits[] = new Text_Diff_Op_delete($diff1);
                    break;
                }
            }

if ($j < $max_j) {
                $diff2 = array();
                switch (substr($diff[$j], 0, 1)) {
                case '+':
                    do {
                        $diff2[] = substr($diff[$j++], 2);
                    } while ($j < $max_j && substr($diff[$j], 0, 1) == '+');
                    $edits[] = new Text_Diff_Op_add($diff2);
                    break;

case '-':
                    do {
                        $diff2[] = substr($diff[$j++], 2);
                    } while ($j < $max_j && substr($diff[$j], 0, 1) == '-');
                    $edits[] = new Text_Diff_Op_delete($diff2);
                    break;
                }
            }
        }

return $edits;
    }

}

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