includes/diffengine/Engine/string.php
author Dan
Thu, 17 Jan 2008 02:03:33 -0500
changeset 349 fdaf9070566c
parent 1 fe660c52c48f
child 1227 bdac73ed481e
permissions -rw-r--r--
More progress on the installer. At this point it can install and import the language, but does not rename config files. Still much work to be done, most notably localization and creation of MySQL users and databases.
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<?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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 * @author    �rjan Persson <o@42mm.org>
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 * @copyright Copyright 2005 �rjan Persson
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 * @package   Text_Diff
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 * @since     0.2.0
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 * @access    private
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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, $mode = 'autodetect')
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    {
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        if ($mode != 'autodetect' && $mode != 'context' && $mode != 'unified') {
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            die_friendly('Text_Diff', '<p>Type of diff is unsupported</p>');
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        }
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        if ($mode == 'autodetect') {
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            $context = strpos($diff, '***');
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            $unified = strpos($diff, '---');
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            if ($context === $unified) {
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                die_friendly('Text_Diff', '<p>Type of diff could not be detected</p>');
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            } elseif ($context === false || $context === 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
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        $diff = explode("\n", $diff);
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        array_shift($diff);
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        array_shift($diff);
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        if ($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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                $j++;
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            }
fe660c52c48f Adding /includes
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            while ($i < $max_i && ($max_j-$j) <= 1) {
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parents:
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   153
                if ($diff[$i] != '' && substr($diff[$i], 0, 1) != ' ') {
fe660c52c48f Adding /includes
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parents:
diff changeset
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                    break;
fe660c52c48f Adding /includes
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parents:
diff changeset
   155
                }
fe660c52c48f Adding /includes
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parents:
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                $array[] = substr($diff[$i++], 2);
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parents:
diff changeset
   157
            }
fe660c52c48f Adding /includes
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parents:
diff changeset
   158
            while ($j < $max_j && ($max_i-$i) <= 1) {
fe660c52c48f Adding /includes
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parents:
diff changeset
   159
                if ($diff[$j] != '' && substr($diff[$j], 0, 1) != ' ') {
fe660c52c48f Adding /includes
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parents:
diff changeset
   160
                    break;
fe660c52c48f Adding /includes
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parents:
diff changeset
   161
                }
fe660c52c48f Adding /includes
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parents:
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   162
                $array[] = substr($diff[$j++], 2);
fe660c52c48f Adding /includes
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parents:
diff changeset
   163
            }
fe660c52c48f Adding /includes
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parents:
diff changeset
   164
            if (count($array) > 0) {
fe660c52c48f Adding /includes
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parents:
diff changeset
   165
                $edits[] = &new Text_Diff_Op_copy($array);
fe660c52c48f Adding /includes
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parents:
diff changeset
   166
            }
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   167
fe660c52c48f Adding /includes
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parents:
diff changeset
   168
            if ($i < $max_i) {
fe660c52c48f Adding /includes
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parents:
diff changeset
   169
                $diff1 = array();
fe660c52c48f Adding /includes
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parents:
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   170
                switch (substr($diff[$i], 0, 1)) {
fe660c52c48f Adding /includes
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parents:
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   171
                case '!':
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parents:
diff changeset
   172
                    $diff2 = array();
fe660c52c48f Adding /includes
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parents:
diff changeset
   173
                    do {
fe660c52c48f Adding /includes
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parents:
diff changeset
   174
                        $diff1[] = substr($diff[$i], 2);
fe660c52c48f Adding /includes
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parents:
diff changeset
   175
                        if ($j < $max_j && substr($diff[$j], 0, 1) == '!') {
fe660c52c48f Adding /includes
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parents:
diff changeset
   176
                            $diff2[] = substr($diff[$j++], 2);
fe660c52c48f Adding /includes
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parents:
diff changeset
   177
                        }
fe660c52c48f Adding /includes
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parents:
diff changeset
   178
                    } while (++$i < $max_i && substr($diff[$i], 0, 1) == '!');
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   179
                    $edits[] = &new Text_Diff_Op_change($diff1, $diff2);
fe660c52c48f Adding /includes
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parents:
diff changeset
   180
                    break;
fe660c52c48f Adding /includes
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parents:
diff changeset
   181
                case '+':
fe660c52c48f Adding /includes
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parents:
diff changeset
   182
                    do {
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   183
                        $diff1[] = substr($diff[$i], 2);
fe660c52c48f Adding /includes
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parents:
diff changeset
   184
                    } while (++$i < $max_i && substr($diff[$i], 0, 1) == '+');
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   185
                    $edits[] = &new Text_Diff_Op_add($diff1);
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   186
                    break;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   187
                case '-':
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   188
                    do {
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   189
                        $diff1[] = substr($diff[$i], 2);
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   190
                    } while (++$i < $max_i && substr($diff[$i], 0, 1) == '-');
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   191
                    $edits[] = &new Text_Diff_Op_delete($diff1);
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   192
                    break;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   193
                }
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   194
            }
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   195
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   196
            if ($j < $max_j) {
fe660c52c48f Adding /includes
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parents:
diff changeset
   197
                $diff2 = array();
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   198
                switch (substr($diff[$j], 0, 1)) {
fe660c52c48f Adding /includes
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parents:
diff changeset
   199
                case '+':
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   200
                    do {
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   201
                        $diff2[] = substr($diff[$j++], 2);
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   202
                    } while ($j < $max_j && substr($diff[$j], 0, 1) == '+');
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   203
                    $edits[] = &new Text_Diff_Op_add($diff2);
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   204
                    break;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   205
                case '-':
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   206
                    do {
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   207
                        $diff2[] = substr($diff[$j++], 2);
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   208
                    } while ($j < $max_j && substr($diff[$j], 0, 1) == '-');
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   209
                    $edits[] = &new Text_Diff_Op_delete($diff2);
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   210
                    break;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   211
                }
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   212
            }
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   213
        }
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   214
        return $edits;
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   215
    }
fe660c52c48f Adding /includes
dan@scribus.fuhry.local.fuhry.local
parents:
diff changeset
   216
}