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<?php
namespace Drupal\Core\Diff;
use Drupal\Component\Diff\DiffFormatter as DiffFormatterBase;
use Drupal\Component\Diff\WordLevelDiff;
use Drupal\Component\Utility\Html;
use Drupal\Core\Config\ConfigFactoryInterface;
/**
* Diff formatter which uses returns output that can be rendered to a table.
*/
class DiffFormatter extends DiffFormatterBase {
/**
* The diff represented as an array of rows.
*
* @var array
*/
protected $rows = [];
/**
* Creates a DiffFormatter to render diffs in a table.
*
* @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
* The config factory.
*/
public function __construct(ConfigFactoryInterface $config_factory) {
$config = $config_factory->get('system.diff');
$this->leading_context_lines = $config->get('context.lines_leading');
$this->trailing_context_lines = $config->get('context.lines_trailing');
}
/**
* {@inheritdoc}
*/
protected function _start_diff() {
$this->rows = [];
}
/**
* {@inheritdoc}
*/
protected function _end_diff() {
return $this->rows;
}
/**
* {@inheritdoc}
*/
protected function _block_header($xbeg, $xlen, $ybeg, $ylen) {
return [
[
'data' => $xbeg + $this->line_stats['offset']['x'],
'colspan' => 2,
],
[
'data' => $ybeg + $this->line_stats['offset']['y'],
'colspan' => 2,
]
];
}
/**
* {@inheritdoc}
*/
protected function _start_block($header) {
if ($this->show_header) {
$this->rows[] = $header;
}
}
/**
* {@inheritdoc}
*/
protected function _lines($lines, $prefix=' ', $color='white') {
}
/**
* Creates an added line.
*
* @param string $line
* An HTML-escaped line.
*
* @return array
* An array representing a table row.
*/
protected function addedLine($line) {
return [
[
'data' => '+',
'class' => 'diff-marker',
],
[
'data' => ['#markup' => $line],
'class' => 'diff-context diff-addedline',
]
];
}
/**
* Creates a deleted line.
*
* @param string $line
* An HTML-escaped line.
*
* @return array
* An array representing a table row.
*/
protected function deletedLine($line) {
return [
[
'data' => '-',
'class' => 'diff-marker',
],
[
'data' => ['#markup' => $line],
'class' => 'diff-context diff-deletedline',
]
];
}
/**
* Creates a context line.
*
* @param string $line
* An HTML-escaped line.
*
* @return array
* An array representing a table row.
*/
protected function contextLine($line) {
return [
' ',
[
'data' => ['#markup' => $line],
'class' => 'diff-context',
]
];
}
/**
* Creates an empty line.
*
* @return array
* An array representing a table row.
*/
protected function emptyLine() {
return [
' ',
' ',
];
}
/**
* {@inheritdoc}
*/
protected function _added($lines) {
foreach ($lines as $line) {
$this->rows[] = array_merge($this->emptyLine(), $this->addedLine(Html::escape($line)));
}
}
/**
* {@inheritdoc}
*/
protected function _deleted($lines) {
foreach ($lines as $line) {
$this->rows[] = array_merge($this->deletedLine(Html::escape($line)), $this->emptyLine());
}
}
/**
* {@inheritdoc}
*/
protected function _context($lines) {
foreach ($lines as $line) {
$this->rows[] = array_merge($this->contextLine(Html::escape($line)), $this->contextLine(Html::escape($line)));
}
}
/**
* {@inheritdoc}
*/
protected function _changed($orig, $closing) {
$orig = array_map('\Drupal\Component\Utility\Html::escape', $orig);
$closing = array_map('\Drupal\Component\Utility\Html::escape', $closing);
$diff = new WordLevelDiff($orig, $closing);
$del = $diff->orig();
$add = $diff->closing();
// Notice that WordLevelDiff returns HTML-escaped output. Hence, we will be
// calling addedLine/deletedLine without HTML-escaping.
while ($line = array_shift($del)) {
$aline = array_shift( $add );
$this->rows[] = array_merge($this->deletedLine($line), isset($aline) ? $this->addedLine($aline) : $this->emptyLine());
}
// If any leftovers.
foreach ($add as $line) {
$this->rows[] = array_merge($this->emptyLine(), $this->addedLine($line));
}
}
}