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Edit File : Diff.php \| Size : 12.65 KB
<?php /** * General API for generating and formatting diffs - the differences between * two sequences of strings. * * The original PHP version of this code was written by Geoffrey T. Dairiki * <dairiki@dairiki.org>, and is used/adapted with his permission. * * Copyright 2004 Geoffrey T. Dairiki <dairiki@dairiki.org> * 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 * @author Geoffrey T. Dairiki <dairiki@dairiki.org> / class Text_Diff { /* * Array of changes. * * @var array / var $_edits; /* * Computes diffs between sequences of strings. * * @param string $engine Name of the diffing engine to use. 'auto' * will automatically select the best. * @param array $params Parameters to pass to the diffing engine. * Normally an array of two arrays, each * containing the lines from a file. / function __construct( $engine, $params ) { // Backward compatibility workaround. if (!is_string($engine)) { $params = array($engine, $params); $engine = 'auto'; } if ($engine == 'auto') { $engine = extension_loaded('xdiff') ? 'xdiff' : 'native'; } else { $engine = basename($engine); } // WP #7391 require_once dirname(__FILE__).'/Diff/Engine/' . $engine . '.php'; $class = 'Text_Diff_Engine_' . $engine; $diff_engine = new $class(); $this->_edits = call_user_func_array(array($diff_engine, 'diff'), $params); } /* * PHP4 constructor. / public function Text_Diff( $engine, $params ) { self::__construct( $engine, $params ); } /* * Returns the array of differences. / function getDiff() { return $this->_edits; } /* * returns the number of new (added) lines in a given diff. * * @since Text_Diff 1.1.0 * * @return integer The number of new lines / function countAddedLines() { $count = 0; foreach ($this->_edits as $edit) { if (is_a($edit, 'Text_Diff_Op_add') \|\| is_a($edit, 'Text_Diff_Op_change')) { $count += $edit->nfinal(); } } return $count; } /* * Returns the number of deleted (removed) lines in a given diff. * * @since Text_Diff 1.1.0 * * @return integer The number of deleted lines / function countDeletedLines() { $count = 0; foreach ($this->_edits as $edit) { if (is_a($edit, 'Text_Diff_Op_delete') \|\| is_a($edit, 'Text_Diff_Op_change')) { $count += $edit->norig(); } } return $count; } /* * Computes a reversed diff. * * Example: * <code> * $diff = new Text_Diff($lines1, $lines2); * $rev = $diff->reverse(); * </code> * * @return Text_Diff A Diff object representing the inverse of the * original diff. Note that we purposely don't return a * reference here, since this essentially is a clone() * method. / function reverse() { if (version_compare(zend_version(), '2', '>')) { $rev = clone($this); } else { $rev = $this; } $rev->_edits = array(); foreach ($this->_edits as $edit) { $rev->_edits[] = $edit->reverse(); } return $rev; } /* * Checks for an empty diff. * * @return boolean True if two sequences were identical. / function isEmpty() { foreach ($this->_edits as $edit) { if (!is_a($edit, 'Text_Diff_Op_copy')) { return false; } } return true; } /* * Computes the length of the Longest Common Subsequence (LCS). * * This is mostly for diagnostic purposes. * * @return integer The length of the LCS. / function lcs() { $lcs = 0; foreach ($this->_edits as $edit) { if (is_a($edit, 'Text_Diff_Op_copy')) { $lcs += count($edit->orig); } } return $lcs; } /* * Gets the original set of lines. * * This reconstructs the $from_lines parameter passed to the constructor. * * @return array The original sequence of strings. / function getOriginal() { $lines = array(); foreach ($this->_edits as $edit) { if ($edit->orig) { array_splice($lines, count($lines), 0, $edit->orig); } } return $lines; } /* * Gets the final set of lines. * * This reconstructs the $to_lines parameter passed to the constructor. * * @return array The sequence of strings. / function getFinal() { $lines = array(); foreach ($this->_edits as $edit) { if ($edit->final) { array_splice($lines, count($lines), 0, $edit->final); } } return $lines; } /* * Removes trailing newlines from a line of text. This is meant to be used * with array_walk(). * * @param string $line The line to trim. * @param integer $key The index of the line in the array. Not used. / static function trimNewlines(&$line, $key) { $line = str_replace(array("\n", "\r"), '', $line); } /* * Determines the location of the system temporary directory. * * @static * * @access protected * * @return string A directory name which can be used for temp files. * Returns false if one could not be found. / function _getTempDir() { $tmp_locations = array('/tmp', '/var/tmp', 'c:\WUTemp', 'c:\temp', 'c:\windows\temp', 'c:\winnt\temp'); / Try PHP's upload_tmp_dir directive. / $tmp = ini_get('upload_tmp_dir'); / Otherwise, try to determine the TMPDIR environment variable. / if (!strlen($tmp)) { $tmp = getenv('TMPDIR'); } / If we still cannot determine a value, then cycle through a list of * preset possibilities. / while (!strlen($tmp) && count($tmp_locations)) { $tmp_check = array_shift($tmp_locations); if (@is_dir($tmp_check)) { $tmp = $tmp_check; } } / If it is still empty, we have failed, so return false; otherwise * return the directory determined. / return strlen($tmp) ? $tmp : false; } /* * Checks a diff for validity. * * This is here only for debugging purposes. / function _check($from_lines, $to_lines) { if (serialize($from_lines) != serialize($this->getOriginal())) { trigger_error("Reconstructed original doesn't match", E_USER_ERROR); } if (serialize($to_lines) != serialize($this->getFinal())) { trigger_error("Reconstructed final doesn't match", E_USER_ERROR); } $rev = $this->reverse(); if (serialize($to_lines) != serialize($rev->getOriginal())) { trigger_error("Reversed original doesn't match", E_USER_ERROR); } if (serialize($from_lines) != serialize($rev->getFinal())) { trigger_error("Reversed final doesn't match", E_USER_ERROR); } $prevtype = null; foreach ($this->_edits as $edit) { if ($prevtype == get_class($edit)) { trigger_error("Edit sequence is non-optimal", E_USER_ERROR); } $prevtype = get_class($edit); } return true; } } /* * @package Text_Diff * @author Geoffrey T. Dairiki <dairiki@dairiki.org> / class Text_MappedDiff extends Text_Diff { /* * Computes a diff between sequences of strings. * * This can be used to compute things like case-insensitve diffs, or diffs * which ignore changes in white-space. * * @param array $from_lines An array of strings. * @param array $to_lines An array of strings. * @param array $mapped_from_lines This array should have the same size * number of elements as $from_lines. The * elements in $mapped_from_lines and * $mapped_to_lines are what is actually * compared when computing the diff. * @param array $mapped_to_lines This array should have the same number * of elements as $to_lines. / function __construct($from_lines, $to_lines, $mapped_from_lines, $mapped_to_lines) { assert(count($from_lines) == count($mapped_from_lines)); assert(count($to_lines) == count($mapped_to_lines)); parent::Text_Diff($mapped_from_lines, $mapped_to_lines); $xi = $yi = 0; for ($i = 0; $i < count($this->_edits); $i++) { $orig = &$this->_edits[$i]->orig; if (is_array($orig)) { $orig = array_slice($from_lines, $xi, count($orig)); $xi += count($orig); } $final = &$this->_edits[$i]->final; if (is_array($final)) { $final = array_slice($to_lines, $yi, count($final)); $yi += count($final); } } } /* * PHP4 constructor. / public function Text_MappedDiff( $from_lines, $to_lines, $mapped_from_lines, $mapped_to_lines ) { self::__construct( $from_lines, $to_lines, $mapped_from_lines, $mapped_to_lines ); } } /* * @package Text_Diff * @author Geoffrey T. Dairiki <dairiki@dairiki.org> * * @access private / class Text_Diff_Op { var $orig; var $final; function &reverse() { trigger_error('Abstract method', E_USER_ERROR); } function norig() { return $this->orig ? count($this->orig) : 0; } function nfinal() { return $this->final ? count($this->final) : 0; } } /* * @package Text_Diff * @author Geoffrey T. Dairiki <dairiki@dairiki.org> * * @access private / class Text_Diff_Op_copy extends Text_Diff_Op { /* * PHP5 constructor. / function __construct( $orig, $final = false ) { if (!is_array($final)) { $final = $orig; } $this->orig = $orig; $this->final = $final; } /* * PHP4 constructor. / public function Text_Diff_Op_copy( $orig, $final = false ) { self::__construct( $orig, $final ); } function &reverse() { $reverse = new Text_Diff_Op_copy($this->final, $this->orig); return $reverse; } } /* * @package Text_Diff * @author Geoffrey T. Dairiki <dairiki@dairiki.org> * * @access private / class Text_Diff_Op_delete extends Text_Diff_Op { /* * PHP5 constructor. / function __construct( $lines ) { $this->orig = $lines; $this->final = false; } /* * PHP4 constructor. / public function Text_Diff_Op_delete( $lines ) { self::__construct( $lines ); } function &reverse() { $reverse = new Text_Diff_Op_add($this->orig); return $reverse; } } /* * @package Text_Diff * @author Geoffrey T. Dairiki <dairiki@dairiki.org> * * @access private / class Text_Diff_Op_add extends Text_Diff_Op { /* * PHP5 constructor. / function __construct( $lines ) { $this->final = $lines; $this->orig = false; } /* * PHP4 constructor. / public function Text_Diff_Op_add( $lines ) { self::__construct( $lines ); } function &reverse() { $reverse = new Text_Diff_Op_delete($this->final); return $reverse; } } /* * @package Text_Diff * @author Geoffrey T. Dairiki <dairiki@dairiki.org> * * @access private / class Text_Diff_Op_change extends Text_Diff_Op { /* * PHP5 constructor. / function __construct( $orig, $final ) { $this->orig = $orig; $this->final = $final; } /* * PHP4 constructor. */ public function Text_Diff_Op_change( $orig, $final ) { self::__construct( $orig, $final ); } function &reverse() { $reverse = new Text_Diff_Op_change($this->final, $this->orig); return $reverse; } } Back

Edit File : Diff.php | Size : 12.65 KB

<?php
/**
 * General API for generating and formatting diffs - the differences between
 * two sequences of strings.
 *
 * The original PHP version of this code was written by Geoffrey T. Dairiki
 * <dairiki@dairiki.org>, and is used/adapted with his permission.
 *
 * Copyright 2004 Geoffrey T. Dairiki <dairiki@dairiki.org>
 * 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
 * @author  Geoffrey T. Dairiki <dairiki@dairiki.org>
 */
class Text_Diff {

/**
     * Array of changes.
     *
     * @var array
     */
    var $_edits;

/**
     * Computes diffs between sequences of strings.
     *
     * @param string $engine     Name of the diffing engine to use.  'auto'
     *                           will automatically select the best.
     * @param array $params      Parameters to pass to the diffing engine.
     *                           Normally an array of two arrays, each
     *                           containing the lines from a file.
     */
    function __construct( $engine, $params )
    {
        // Backward compatibility workaround.
        if (!is_string($engine)) {
            $params = array($engine, $params);
            $engine = 'auto';
        }

if ($engine == 'auto') {
            $engine = extension_loaded('xdiff') ? 'xdiff' : 'native';
        } else {
            $engine = basename($engine);
        }

// WP #7391
        require_once dirname(__FILE__).'/Diff/Engine/' . $engine . '.php';
        $class = 'Text_Diff_Engine_' . $engine;
        $diff_engine = new $class();

$this->_edits = call_user_func_array(array($diff_engine, 'diff'), $params);
    }

/**
	 * PHP4 constructor.
	 */
	public function Text_Diff( $engine, $params ) {
		self::__construct( $engine, $params );
	}

/**
     * Returns the array of differences.
     */
    function getDiff()
    {
        return $this->_edits;
    }

/**
     * returns the number of new (added) lines in a given diff.
     *
     * @since Text_Diff 1.1.0
     *
     * @return integer The number of new lines
     */
    function countAddedLines()
    {
        $count = 0;
        foreach ($this->_edits as $edit) {
            if (is_a($edit, 'Text_Diff_Op_add') ||
                is_a($edit, 'Text_Diff_Op_change')) {
                $count += $edit->nfinal();
            }
        }
        return $count;
    }

/**
     * Returns the number of deleted (removed) lines in a given diff.
     *
     * @since Text_Diff 1.1.0
     *
     * @return integer The number of deleted lines
     */
    function countDeletedLines()
    {
        $count = 0;
        foreach ($this->_edits as $edit) {
            if (is_a($edit, 'Text_Diff_Op_delete') ||
                is_a($edit, 'Text_Diff_Op_change')) {
                $count += $edit->norig();
            }
        }
        return $count;
    }

/**
     * Computes a reversed diff.
     *
     * Example:
     * <code>
     * $diff = new Text_Diff($lines1, $lines2);
     * $rev = $diff->reverse();
     * </code>
     *
     * @return Text_Diff  A Diff object representing the inverse of the
     *                    original diff.  Note that we purposely don't return a
     *                    reference here, since this essentially is a clone()
     *                    method.
     */
    function reverse()
    {
        if (version_compare(zend_version(), '2', '>')) {
            $rev = clone($this);
        } else {
            $rev = $this;
        }
        $rev->_edits = array();
        foreach ($this->_edits as $edit) {
            $rev->_edits[] = $edit->reverse();
        }
        return $rev;
    }

/**
     * Checks for an empty diff.
     *
     * @return boolean  True if two sequences were identical.
     */
    function isEmpty()
    {
        foreach ($this->_edits as $edit) {
            if (!is_a($edit, 'Text_Diff_Op_copy')) {
                return false;
            }
        }
        return true;
    }

/**
     * Computes the length of the Longest Common Subsequence (LCS).
     *
     * This is mostly for diagnostic purposes.
     *
     * @return integer  The length of the LCS.
     */
    function lcs()
    {
        $lcs = 0;
        foreach ($this->_edits as $edit) {
            if (is_a($edit, 'Text_Diff_Op_copy')) {
                $lcs += count($edit->orig);
            }
        }
        return $lcs;
    }

/**
     * Gets the original set of lines.
     *
     * This reconstructs the $from_lines parameter passed to the constructor.
     *
     * @return array  The original sequence of strings.
     */
    function getOriginal()
    {
        $lines = array();
        foreach ($this->_edits as $edit) {
            if ($edit->orig) {
                array_splice($lines, count($lines), 0, $edit->orig);
            }
        }
        return $lines;
    }

/**
     * Gets the final set of lines.
     *
     * This reconstructs the $to_lines parameter passed to the constructor.
     *
     * @return array  The sequence of strings.
     */
    function getFinal()
    {
        $lines = array();
        foreach ($this->_edits as $edit) {
            if ($edit->final) {
                array_splice($lines, count($lines), 0, $edit->final);
            }
        }
        return $lines;
    }

/**
     * Removes trailing newlines from a line of text. This is meant to be used
     * with array_walk().
     *
     * @param string $line  The line to trim.
     * @param integer $key  The index of the line in the array. Not used.
     */
    static function trimNewlines(&$line, $key)
    {
        $line = str_replace(array("\n", "\r"), '', $line);
    }

/**
     * Determines the location of the system temporary directory.
     *
     * @static
     *
     * @access protected
     *
     * @return string  A directory name which can be used for temp files.
     *                 Returns false if one could not be found.
     */
    function _getTempDir()
    {
        $tmp_locations = array('/tmp', '/var/tmp', 'c:\WUTemp', 'c:\temp',
                               'c:\windows\temp', 'c:\winnt\temp');

/* Try PHP's upload_tmp_dir directive. */
        $tmp = ini_get('upload_tmp_dir');

/* Otherwise, try to determine the TMPDIR environment variable. */
        if (!strlen($tmp)) {
            $tmp = getenv('TMPDIR');
        }

/* If we still cannot determine a value, then cycle through a list of
         * preset possibilities. */
        while (!strlen($tmp) && count($tmp_locations)) {
            $tmp_check = array_shift($tmp_locations);
            if (@is_dir($tmp_check)) {
                $tmp = $tmp_check;
            }
        }

/* If it is still empty, we have failed, so return false; otherwise
         * return the directory determined. */
        return strlen($tmp) ? $tmp : false;
    }

/**
     * Checks a diff for validity.
     *
     * This is here only for debugging purposes.
     */
    function _check($from_lines, $to_lines)
    {
        if (serialize($from_lines) != serialize($this->getOriginal())) {
            trigger_error("Reconstructed original doesn't match", E_USER_ERROR);
        }
        if (serialize($to_lines) != serialize($this->getFinal())) {
            trigger_error("Reconstructed final doesn't match", E_USER_ERROR);
        }

$rev = $this->reverse();
        if (serialize($to_lines) != serialize($rev->getOriginal())) {
            trigger_error("Reversed original doesn't match", E_USER_ERROR);
        }
        if (serialize($from_lines) != serialize($rev->getFinal())) {
            trigger_error("Reversed final doesn't match", E_USER_ERROR);
        }

$prevtype = null;
        foreach ($this->_edits as $edit) {
            if ($prevtype == get_class($edit)) {
                trigger_error("Edit sequence is non-optimal", E_USER_ERROR);
            }
            $prevtype = get_class($edit);
        }

return true;
    }

}

/**
 * @package Text_Diff
 * @author  Geoffrey T. Dairiki <dairiki@dairiki.org>
 */
class Text_MappedDiff extends Text_Diff {

/**
     * Computes a diff between sequences of strings.
     *
     * This can be used to compute things like case-insensitve diffs, or diffs
     * which ignore changes in white-space.
     *
     * @param array $from_lines         An array of strings.
     * @param array $to_lines           An array of strings.
     * @param array $mapped_from_lines  This array should have the same size
     *                                  number of elements as $from_lines.  The
     *                                  elements in $mapped_from_lines and
     *                                  $mapped_to_lines are what is actually
     *                                  compared when computing the diff.
     * @param array $mapped_to_lines    This array should have the same number
     *                                  of elements as $to_lines.
     */
    function __construct($from_lines, $to_lines,
                             $mapped_from_lines, $mapped_to_lines)
    {
        assert(count($from_lines) == count($mapped_from_lines));
        assert(count($to_lines) == count($mapped_to_lines));

parent::Text_Diff($mapped_from_lines, $mapped_to_lines);

$xi = $yi = 0;
        for ($i = 0; $i < count($this->_edits); $i++) {
            $orig = &$this->_edits[$i]->orig;
            if (is_array($orig)) {
                $orig = array_slice($from_lines, $xi, count($orig));
                $xi += count($orig);
            }

$final = &$this->_edits[$i]->final;
            if (is_array($final)) {
                $final = array_slice($to_lines, $yi, count($final));
                $yi += count($final);
            }
        }
    }

/**
	 * PHP4 constructor.
	 */
	public function Text_MappedDiff( $from_lines, $to_lines,
                             $mapped_from_lines, $mapped_to_lines ) {
		self::__construct( $from_lines, $to_lines,
                             $mapped_from_lines, $mapped_to_lines );
	}

}

/**
 * @package Text_Diff
 * @author  Geoffrey T. Dairiki <dairiki@dairiki.org>
 *
 * @access private
 */
class Text_Diff_Op {

var $orig;
    var $final;

function &reverse()
    {
        trigger_error('Abstract method', E_USER_ERROR);
    }

function norig()
    {
        return $this->orig ? count($this->orig) : 0;
    }

function nfinal()
    {
        return $this->final ? count($this->final) : 0;
    }

}

/**
 * @package Text_Diff
 * @author  Geoffrey T. Dairiki <dairiki@dairiki.org>
 *
 * @access private
 */
class Text_Diff_Op_copy extends Text_Diff_Op {

/**
	 * PHP5 constructor.
	 */
    function __construct( $orig, $final = false )
    {
        if (!is_array($final)) {
            $final = $orig;
        }
        $this->orig = $orig;
        $this->final = $final;
    }

/**
	 * PHP4 constructor.
	 */
	public function Text_Diff_Op_copy( $orig, $final = false ) {
		self::__construct( $orig, $final );
	}

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

}

/**
 * @package Text_Diff
 * @author  Geoffrey T. Dairiki <dairiki@dairiki.org>
 *
 * @access private
 */
class Text_Diff_Op_delete extends Text_Diff_Op {

/**
	 * PHP5 constructor.
	 */
	function __construct( $lines )
    {
        $this->orig = $lines;
        $this->final = false;
    }

/**
	 * PHP4 constructor.
	 */
	public function Text_Diff_Op_delete( $lines ) {
		self::__construct( $lines );
	}

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

}

/**
 * @package Text_Diff
 * @author  Geoffrey T. Dairiki <dairiki@dairiki.org>
 *
 * @access private
 */
class Text_Diff_Op_add extends Text_Diff_Op {

/**
	 * PHP5 constructor.
	 */
    function __construct( $lines )
    {
        $this->final = $lines;
        $this->orig = false;
    }

/**
	 * PHP4 constructor.
	 */
	public function Text_Diff_Op_add( $lines ) {
		self::__construct( $lines );
	}

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

}

/**
 * @package Text_Diff
 * @author  Geoffrey T. Dairiki <dairiki@dairiki.org>
 *
 * @access private
 */
class Text_Diff_Op_change extends Text_Diff_Op {

/**
	 * PHP5 constructor.
	 */
    function __construct( $orig, $final )
    {
        $this->orig = $orig;
        $this->final = $final;
    }

/**
	 * PHP4 constructor.
	 */
	public function Text_Diff_Op_change( $orig, $final ) {
		self::__construct( $orig, $final );
	}

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

}

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