Text_Diff_Engine_xdiff Class Reference

Collaboration diagram for Text_Diff_Engine_xdiff:

Public Member Functions
	diff ($from_lines, $to_lines)

Detailed Description

Definition at line 255 of file Diff.php.

Member Function Documentation

Text_Diff_Engine_xdiff::diff	(		$from_lines,
			$to_lines
	)

Definition at line 257 of file Diff.php.

References $diff.

    {
        /* Convert the two input arrays into strings for xdiff processing. */
        $from_string = implode("\n", $from_lines);
        $to_string = implode("\n", $to_lines);

        /* Diff the two strings and convert the result to an array. */
        $diff = xdiff_string_diff($from_string, $to_string, count($to_lines));
        $diff = explode("\n", $diff);

        /* Walk through the diff one line at a time.  We build the $edits
         * array of diff operations by reading the first character of the
         * xdiff output (which is in the "unified diff" format).
         *
         * Note that we don't have enough information to detect "changed"
         * lines using this approach, so we can't add Text_Diff_Op_changed
         * instances to the $edits array.  The result is still perfectly
         * valid, albeit a little less descriptive and efficient. */
        $edits = array();
        foreach ($diff as $line) {
            switch ($line[0]) {
            case ' ':
                $edits[] = new Text_Diff_Op_copy(array(substr($line, 1)));
                break;

            case '+':
                $edits[] = new Text_Diff_Op_add(array(substr($line, 1)));
                break;

            case '-':
                $edits[] = new Text_Diff_Op_delete(array(substr($line, 1)));
                break;
            }
        }

        return $edits;
    }

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The documentation for this class was generated from the following file:

• Services/XHTMLValidator/validator/Text_Diff/Diff.php