<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\gii\components;

/**
 * Renders diff to HTML. Output adjusted to be copy-paste friendly.
 *
 * @author Alexander Makarov <sam@rmcreative.ru>
 * @since 2.0
 */
class DiffRendererHtmlInline extends \Diff_Renderer_Html_Array
{
	/**
	 * Render a and return diff with changes between the two sequences
	 * displayed inline (under each other)
	 *
	 * @return string The generated inline diff.
	 */
	public function render()
	{
		$changes = parent::render();
		$html = '';
		if (empty($changes)) {
			return $html;
		}

		$html .= <<<HTML
<table class="Differences DifferencesInline">
	<thead>
		<tr>
			<th>Old</th>
			<th>New</th>
			<th>Differences</th>
		</tr>
	</thead>
HTML;
		foreach ($changes as $i => $blocks) {
			// If this is a separate block, we're condensing code so output ...,
			// indicating a significant portion of the code has been collapsed as
			// it is the same
			if ($i > 0) {
				$html .= <<<HTML
	<tbody class="Skipped">
		<th data-line-number="&hellip;"></th>
		<th data-line-number="&hellip;"></th>
		<td>&nbsp;</td>
	</tbody>
HTML;
			}

			foreach ($blocks as $change) {
				$tag = ucfirst($change['tag']);
				$html .= <<<HTML
	<tbody class="Change{$tag}">
HTML;
				// Equal changes should be shown on both sides of the diff
				if ($change['tag'] === 'equal') {
					foreach ($change['base']['lines'] as $no => $line) {
						$fromLine = $change['base']['offset'] + $no + 1;
						$toLine = $change['changed']['offset'] + $no + 1;
						$html .= <<<HTML
		<tr>
			<th data-line-number="{$fromLine}"></th>
			<th data-line-number="{$toLine}"></th>
			<td class="Left">{$line}</td>
		</tr>
HTML;
					}
				}
				// Added lines only on the right side
				elseif ($change['tag'] === 'insert') {
					foreach ($change['changed']['lines'] as $no => $line) {
						$toLine = $change['changed']['offset'] + $no + 1;
						$html .= <<<HTML
		<tr>
			<th data-line-number="&nbsp;"></th>
			<th data-line-number="{$toLine}"></th>
			<td class="Right"><ins>{$line}</ins>&nbsp;</td>
		</tr>
HTML;
					}
				}
				// Show deleted lines only on the left side
				elseif ($change['tag'] === 'delete') {
					foreach ($change['base']['lines'] as $no => $line) {
						$fromLine = $change['base']['offset'] + $no + 1;
						$html .= <<<HTML
		<tr>
			<th data-line-number="{$fromLine}"></th>
			<th data-line-number="&nbsp;"></th>
			<td class="Left"><del>{$line}</del>&nbsp;</td>
		</tr>
HTML;
					}
				}
				// Show modified lines on both sides
				elseif ($change['tag'] === 'replace') {
					foreach ($change['base']['lines'] as $no => $line) {
						$fromLine = $change['base']['offset'] + $no + 1;
						$html .= <<<HTML
		<tr>
			<th data-line-number="{$fromLine}"></th>
			<th data-line-number="&nbsp;"></th>
			<td class="Left"><span>{$line}</span></td>
		</tr>
HTML;
					}

					foreach ($change['changed']['lines'] as $no => $line) {
						$toLine = $change['changed']['offset'] + $no + 1;
						$html .= <<<HTML
		<tr>
			<th data-line-number="{$toLine}"></th>
			<th data-line-number="&nbsp;"></th>
			<td class="Right"><span>{$line}</span></td>
		</tr>
HTML;
					}
				}
				$html .= <<<HTML
	</tbody>
HTML;
			}
		}
		$html .= <<<HTML
</table>
HTML;
		return $html;
	}
}
