<?php

/**
 * Parallel diff renderer for HTML tables with original text on left,
 * new text on right, and changed text highlighted with appropriate classes.
 */
class Text_Diff_Renderer_parallel extends Text_Diff_Renderer
{
	/** String header for left column */
	var $original = 'Original';
	/** String header for right column */
	var $final    = 'Final';
	var $_leading_context_lines = 10000; // these are big to ensure entire string is output
	var $_trailing_context_lines = 10000;
	function _blockHeader() {}
	function _startDiff() {
		return '<table class="diff"><thead><tr><th>'. $this->original .'</th><th>'. $this->final .'</th></tr></thead><tbody>';
	}
	function _endDiff() {
		return '</tbody></table>';
	}
	function _context($lines) {
		return '<tr><td><pre>'. htmlspecialchars(implode("\n", $lines)) .'</pre></td>
			<td><pre>'. htmlspecialchars(implode("\n", $lines)) .'</pre></td></tr>';
	}
	function _added($lines) {
		return '<tr><td>&nbsp;</td><td class="added"><pre>'. htmlspecialchars(implode("\n", $lines)) .'</pre></td></tr>';
	}
	function _deleted($lines) {
		return '<tr><td class="deleted"><pre>'. htmlspecialchars(implode("\n", $lines)) .'</pre></td><td>&nbsp;</td></tr>';
	}
	function _changed($orig, $final) {
		return '<tr class="changed"><td><pre>'. htmlspecialchars(implode("\n", $orig)) .'</pre></td>
		<td><pre>'. htmlspecialchars(implode("\n", $final)) .'</pre></td></tr>';
	}
}
