diff.inc.php

简介：IceBB是一个强大

 * @author  Geoffrey T. Dairiki <[e-mail]>
 * @access  private
 */
class Text_Diff_Op_change extends Text_Diff_Op {

    function Text_Diff_Op_change($orig, $final)
    {
        $this->orig = $orig;
        $this->final = $final;
    }

    function &reverse()
    {
        return $reverse = &new Text_Diff_Op_change($this->final, $this->orig);
    }

}

// from Diff/Renderer.php

/**
 * A class to render Diffs in different formats.
 *
 * This class renders the diff in classic diff format. It is intended that
 * this class be customized via inheritance, to obtain fancier outputs.
 *
 * $Horde: framework/Text_Diff/Diff/Renderer.php,v 1.8 2005/05/02 19:44:53 chuck Exp $
 *
 * @package Text_Diff
 */
class Text_Diff_Renderer {

    /**
     * Number of leading context "lines" to preserve.
     *
     * This should be left at zero for this class, but subclasses may want to
     * set this to other values.
     */
    var $_leading_context_lines = 0;

    /**
     * Number of trailing context "lines" to preserve.
     *
     * This should be left at zero for this class, but subclasses may want to
     * set this to other values.
     */
    var $_trailing_context_lines = 0;

    /**
     * Constructor.
     */
    function Text_Diff_Renderer($params = array())
    {
        foreach ($params as $param => $value) {
            $v = '_' . $param;
            if (isset($this->$v)) {
                $this->$v = $value;
            }
        }
    }

    /**
     * Get any renderer parameters.
     *
     * @return array  All parameters of this renderer object.
     */
    function getParams()
    {
        return get_object_vars($this);
    }

    /**
     * Renders a diff.
     *
     * @param Text_Diff $diff  A Text_Diff object.
     *
     * @return string  The formatted output.
     */
    function render($diff)
    {
        $xi = $yi = 1;
        $block = false;
        $context = array();

        $nlead = $this->_leading_context_lines;
        $ntrail = $this->_trailing_context_lines;

        $output = $this->_startDiff();

        foreach ($diff->getDiff() as $edit) {
            if (is_a($edit, 'Text_Diff_Op_copy')) {
                if (is_array($block)) {
                    if (count($edit->orig) <= $nlead + $ntrail) {
                        $block[] = $edit;
                    } else {
                        if ($ntrail) {
                            $context = array_slice($edit->orig, 0, $ntrail);
                            $block[] = &new Text_Diff_Op_copy($context);
                        }
                        $output .= $this->_block($x0, $ntrail + $xi - $x0,
                                                 $y0, $ntrail + $yi - $y0,
                                                 $block);
                        $block = false;
                    }
                }
                $context = $edit->orig;
            } else {
                if (!is_array($block)) {
                    $context = array_slice($context, count($context) - $nlead);
                    $x0 = $xi - count($context);
                    $y0 = $yi - count($context);
                    $block = array();
                    if ($context) {
                        $block[] = &new Text_Diff_Op_copy($context);
                    }
                }
                $block[] = $edit;
            }

            if ($edit->orig) {
                $xi += count($edit->orig);
            }
            if ($edit->final) {
                $yi += count($edit->final);
            }
        }

        if (is_array($block)) {
            $output .= $this->_block($x0, $xi - $x0,
                                     $y0, $yi - $y0,
                                     $block);
        }

        return $output . $this->_endDiff();
    }

    function _block($xbeg, $xlen, $ybeg, $ylen, &$edits)
    {
        $output = $this->_startBlock($this->_blockHeader($xbeg, $xlen, $ybeg, $ylen));

        foreach ($edits as $edit) {
            switch (strtolower(get_class($edit))) {
            case 'text_diff_op_copy':
                $output .= $this->_context($edit->orig);
                break;

            case 'text_diff_op_add':
                $output .= $this->_added($edit->final);
                break;

            case 'text_diff_op_delete':
                $output .= $this->_deleted($edit->orig);
                break;

            case 'text_diff_op_change':
                $output .= $this->_changed($edit->orig, $edit->final);
                break;
            }
        }

        return $output . $this->_endBlock();
    }

    function _startDiff()
    {
        return '';
    }

    function _endDiff()
    {
        return '';
    }

    function _blockHeader($xbeg, $xlen, $ybeg, $ylen)
    {
        if ($xlen > 1) {
            $xbeg .= ',' . ($xbeg + $xlen - 1);
        }
        if ($ylen > 1) {
            $ybeg .= ',' . ($ybeg + $ylen - 1);
        }

        return $xbeg . ($xlen ? ($ylen ? 'c' : 'd') : 'a') . $ybeg;
    }

    function _startBlock($header)
    {
        return $header . "\n";
    }

    function _endBlock()
    {
        return '';
    }

    function _lines($lines, $prefix = ' ')
    {
        return $prefix . implode("\n$prefix", $lines) . "\n";
    }

    function _context($lines)
    {
        return $this->_lines($lines);
    }

    function _added($lines)
    {
        return $this->_lines($lines, '>');
    }

    function _deleted($lines)
    {
        return $this->_lines($lines, '<');
    }

    function _changed($orig, $final)
    {
        return $this->_deleted($orig) . "---\n" . $this->_added($final);
    }

}

/**
 * "Inline" diff renderer.
 *
 * This class renders diffs in the Wiki-style "inline" format.
 *
 * $Horde: framework/Text_Diff/Diff/Renderer/inline.php,v 1.11 2005/05/02 19:49:39 chuck Exp $
 *
 * @author  Ciprian Popovici
 * @package Text_Diff
 */
class Text_Diff_Renderer_inline extends Text_Diff_Renderer {

    /**
     * Number of leading context "lines" to preserve.
     */
    var $_leading_context_lines = 10000;

    /**
     * Number of trailing context "lines" to preserve.
     */
    var $_trailing_context_lines = 10000;

    /**
     * Prefix for inserted text.
     */
    var $_ins_prefix = '<ins>';

    /**
     * Suffix for inserted text.
     */
    var $_ins_suffix = '</ins>';

    /**
     * Prefix for deleted text.
     */
    var $_del_prefix = '<del>';

    /**
     * Suffix for deleted text.
     */
    var $_del_suffix = '</del>';

    /**
     * Header for each change block.
     */
    var $_block_header = '';

    /**
     * What are we currently splitting on? Used to recurse to show word-level
     * changes.
     */
    var $_split_level = 'lines';

    function _lines($lines, $prefix = ' ')
    {
        if ($this->_split_level == 'words') {
            return implode('', $lines);
        } else {
            return implode("\n", $lines) . "\n";
        }
    }

    function _blockHeader($xbeg, $xlen, $ybeg, $ylen)
    {
        return $this->_block_header;
    }

    function _startBlock($header)
    {
        return $header;
    }

    function _added($lines)
    {
        $lines[0] = $this->_ins_prefix . $lines[0];
        $lines[count($lines) - 1] .= $this->_ins_suffix;
        return $this->_lines($lines);
    }

    function _deleted($lines, $words = false)
    {
        $lines[0] = $this->_del_prefix . $lines[0];
        $lines[count($lines) - 1] .= $this->_del_suffix;
        return $this->_lines($lines);
    }

    function _changed($orig, $final)
    {
        /* If we've already split on words, don't try to do so again - just
         * display. */
        if ($this->_split_level == 'words') {
            $prefix = '';
            while (substr($orig[0], 0, 1) == substr($final[0], 0, 1)) {
                $prefix .= substr($orig[0], 0, 1);
                $orig[0] = substr($orig[0], 1);
                $final[0] = substr($final[0], 1);
            }
            return $prefix . $this->_deleted($orig) . $this->_added($final);
        }

        $text1 = implode("\n", $orig);
        $text2 = implode("\n", $final);

        /* Non-printing newline marker. */
        $nl = "\0";

        /* We want to split on word boundaries, but we need to
         * preserve whitespace as well. Therefore we split on words,
         * but include all blocks of whitespace in the wordlist. */
        $diff = &new Text_Diff($this->_splitOnWords($text1, $nl),
                               $this->_splitOnWords($text2, $nl));

        /* Get the diff in inline format. */
        $renderer = &new Text_Diff_Renderer_inline(array_merge($this->getParams(),
                                                               array('split_level' => 'words')));

        /* Run the diff and get the output. */
        return str_replace($nl, "\n", $renderer->render($diff)) . "\n";
    }

    function _splitOnWords($string, $newlineEscape = "\n")
    {
        $words = array();
        $length = strlen($string);
        $pos = 0;

        while ($pos < $length) {
            // Eat a word with any preceding whitespace.
            $spaces = strspn($string, " \n", $pos);
            $nextpos = strcspn($string, " \n", $pos + $spaces);
            $words[] = str_replace("\n", $newlineEscape, substr($string, $pos, $spaces + $nextpos));
            $pos += $spaces + $nextpos;
        }

        return $words;
    }

}

/**
 * "Unified" diff renderer.
 *
 * This class renders the diff in classic "unified diff" format.
 *
 * $Horde: framework/Text_Diff/Diff/Renderer/unified.php,v 1.4 2005/03/07 14:58:30 jan Exp $
 *
 * @package Text_Diff
 */
class Text_Diff_Renderer_unified extends Text_Diff_Renderer {

    /**
     * Number of leading context "lines" to preserve.
     */
    var $_leading_context_lines = 4;

    /**
     * Number of trailing context "lines" to preserve.
     */
    var $_trailing_context_lines = 4;

    function _blockHeader($xbeg, $xlen, $ybeg, $ylen)
    {
        if ($xlen != 1) {
            $xbeg .= ',' . $xlen;
        }
        if ($ylen != 1) {
            $ybeg .= ',' . $ylen;
        }
        return "@@ -$xbeg +$ybeg @@";
    }

    function _added($lines)
    {
        return $this->_lines($lines, '+');
    }

    function _deleted($lines)
    {
        return $this->_lines($lines, '-');
    }

    function _changed($orig, $final)
    {
        return $this->_deleted($orig) . $this->_added($final);
    }

}
?>