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Edit File : Renderer.php \| Size : 6.65 KB
<?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. * * Copyright 2004-2010 The Horde Project (http://www.horde.org/) * * See the enclosed file COPYING for license information (LGPL). If you did * not receive this file, see http://opensource.org/licenses/lgpl-license.php. * * @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 __construct( $params = array() ) { foreach ($params as $param => $value) { $v = '_' . $param; if (isset($this->$v)) { $this->$v = $value; } } } /* * PHP4 constructor. / public function Text_Diff_Renderer( $params = array() ) { self::__construct( $params ); } /* * Get any renderer parameters. * * @return array All parameters of this renderer object. / function getParams() { $params = array(); foreach (get_object_vars($this) as $k => $v) { if ($k[0] == '_') { $params[substr($k, 1)] = $v; } } return $params; } /* * 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(); $diffs = $diff->getDiff(); foreach ($diffs as $i => $edit) { / If these are unchanged (copied) lines, and we want to keep * leading or trailing context lines, extract them from the copy * block. / if (is_a($edit, 'Text_Diff_Op_copy')) { / Do we have any diff blocks yet? / if (is_array($block)) { / How many lines to keep as context from the copy * block. / $keep = $i == count($diffs) - 1 ? $ntrail : $nlead + $ntrail; if (count($edit->orig) <= $keep) { / We have less lines in the block than we want for * context => keep the whole block. / $block[] = $edit; } else { if ($ntrail) { / Create a new block with as many lines as we need * for the trailing context. / $context = array_slice($edit->orig, 0, $ntrail); $block[] = new Text_Diff_Op_copy($context); } / @todo / $output .= $this->_block($x0, $ntrail + $xi - $x0, $y0, $ntrail + $yi - $y0, $block); $block = false; } } / Keep the copy block as the context for the next block. / $context = $edit->orig; } else { / Don't we have any diff blocks yet? / if (!is_array($block)) { / Extract context lines from the preceding copy 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 + $ylen - 1); } // this matches the GNU Diff behaviour if ($xlen && !$ylen) { $ybeg--; } elseif (!$xlen) { $xbeg--; } 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); } } Back

Edit File : Renderer.php | Size : 6.65 KB

<?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.
 *
 * Copyright 2004-2010 The Horde Project (http://www.horde.org/)
 *
 * See the enclosed file COPYING for license information (LGPL). If you did
 * not receive this file, see http://opensource.org/licenses/lgpl-license.php.
 *
 * @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 __construct( $params = array() )
    {
        foreach ($params as $param => $value) {
            $v = '_' . $param;
            if (isset($this->$v)) {
                $this->$v = $value;
            }
        }
    }

/**
	 * PHP4 constructor.
	 */
	public function Text_Diff_Renderer( $params = array() ) {
		self::__construct( $params );
	}

/**
     * Get any renderer parameters.
     *
     * @return array  All parameters of this renderer object.
     */
    function getParams()
    {
        $params = array();
        foreach (get_object_vars($this) as $k => $v) {
            if ($k[0] == '_') {
                $params[substr($k, 1)] = $v;
            }
        }

return $params;
    }

/**
     * 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();

$diffs = $diff->getDiff();
        foreach ($diffs as $i => $edit) {
            /* If these are unchanged (copied) lines, and we want to keep
             * leading or trailing context lines, extract them from the copy
             * block. */
            if (is_a($edit, 'Text_Diff_Op_copy')) {
                /* Do we have any diff blocks yet? */
                if (is_array($block)) {
                    /* How many lines to keep as context from the copy
                     * block. */
                    $keep = $i == count($diffs) - 1 ? $ntrail : $nlead + $ntrail;
                    if (count($edit->orig) <= $keep) {
                        /* We have less lines in the block than we want for
                         * context => keep the whole block. */
                        $block[] = $edit;
                    } else {
                        if ($ntrail) {
                            /* Create a new block with as many lines as we need
                             * for the trailing context. */
                            $context = array_slice($edit->orig, 0, $ntrail);
                            $block[] = new Text_Diff_Op_copy($context);
                        }
                        /* @todo */
                        $output .= $this->_block($x0, $ntrail + $xi - $x0,
                                                 $y0, $ntrail + $yi - $y0,
                                                 $block);
                        $block = false;
                    }
                }
                /* Keep the copy block as the context for the next block. */
                $context = $edit->orig;
            } else {
                /* Don't we have any diff blocks yet? */
                if (!is_array($block)) {
                    /* Extract context lines from the preceding copy 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);
        }

// this matches the GNU Diff behaviour
        if ($xlen && !$ylen) {
            $ybeg--;
        } elseif (!$xlen) {
            $xbeg--;
        }

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);
    }

}

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