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<?php
/**
 * @link https://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license https://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="…"></th>
        <th data-line-number="…"></th>
        <td> </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;
                        $html .= <<<HTML
        <tr>
            <th data-line-number=" "></th>
            <th data-line-number="{$toLine}"></th>
            <td class="Right"><ins>{$line}</ins> </td>
        </tr>
HTML;
                    }
                }
                // Show deleted lines only on the left side
                elseif ($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=" "></th>
            <td class="Left"><del>{$line}</del> </td>
        </tr>
HTML;
                    }
                }
                // Show modified lines on both sides
                elseif ($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=" "></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=" "></th>
            <td class="Right"><span>{$line}</span></td>
        </tr>
HTML;
                    }
                }
                $html .= <<<HTML
    </tbody>
HTML;
            }
        }
        $html .= <<<HTML
</table>
HTML;

return $html;
    }
}