Файл: vendor/league/commonmark/src/Extension/Attributes/Util/AttributesHelper.php
Строк: 129
<?php
/*
* This file is part of the league/commonmark package.
*
* (c) Colin O'Dell <colinodell@gmail.com>
* (c) 2015 Martin Hasoň <martin.hason@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
declare(strict_types=1);
namespace LeagueCommonMarkExtensionAttributesUtil;
use LeagueCommonMarkNodeNode;
use LeagueCommonMarkParserCursor;
use LeagueCommonMarkUtilRegexHelper;
/**
* @internal
*/
final class AttributesHelper
{
private const SINGLE_ATTRIBUTE = 's*([.]-?[_a-z][^s.}]*|[#][^s}]+|' . RegexHelper::PARTIAL_ATTRIBUTENAME . RegexHelper::PARTIAL_ATTRIBUTEVALUESPEC . ')s*';
private const ATTRIBUTE_LIST = '/^{:?(' . self::SINGLE_ATTRIBUTE . ')+}/i';
/**
* @return array<string, mixed>
*/
public static function parseAttributes(Cursor $cursor): array
{
$state = $cursor->saveState();
$cursor->advanceToNextNonSpaceOrNewline();
// Quick check to see if we might have attributes
if ($cursor->getCharacter() !== '{') {
$cursor->restoreState($state);
return [];
}
// Attempt to match the entire attribute list expression
// While this is less performant than checking for '{' now and '}' later, it simplifies
// matching individual attributes since they won't need to look ahead for the closing '}'
// while dealing with the fact that attributes can technically contain curly braces.
// So we'll just match the start and end braces up front.
$attributeExpression = $cursor->match(self::ATTRIBUTE_LIST);
if ($attributeExpression === null) {
$cursor->restoreState($state);
return [];
}
// Trim the leading '{' or '{:' and the trailing '}'
$attributeExpression = ltrim(substr($attributeExpression, 1, -1), ':');
$attributeCursor = new Cursor($attributeExpression);
/** @var array<string, mixed> $attributes */
$attributes = [];
while ($attribute = trim((string) $attributeCursor->match('/^' . self::SINGLE_ATTRIBUTE . '/i'))) {
if ($attribute[0] === '#') {
$attributes['id'] = substr($attribute, 1);
continue;
}
if ($attribute[0] === '.') {
$attributes['class'][] = substr($attribute, 1);
continue;
}
/** @psalm-suppress PossiblyUndefinedArrayOffset */
[$name, $value] = explode('=', $attribute, 2);
if ($value === 'true') {
$attributes[$name] = true;
continue;
}
$first = $value[0];
$last = substr($value, -1);
if (($first === '"' && $last === '"') || ($first === "'" && $last === "'") && strlen($value) > 1) {
$value = substr($value, 1, -1);
}
if (strtolower(trim($name)) === 'class') {
foreach (array_filter(explode(' ', trim($value))) as $class) {
$attributes['class'][] = $class;
}
} else {
$attributes[trim($name)] = trim($value);
}
}
if (isset($attributes['class'])) {
$attributes['class'] = implode(' ', (array) $attributes['class']);
}
return $attributes;
}
/**
* @param Node|array<string, mixed> $attributes1
* @param Node|array<string, mixed> $attributes2
*
* @return array<string, mixed>
*/
public static function mergeAttributes($attributes1, $attributes2): array
{
$attributes = [];
foreach ([$attributes1, $attributes2] as $arg) {
if ($arg instanceof Node) {
$arg = $arg->data->get('attributes');
}
/** @var array<string, mixed> $arg */
$arg = (array) $arg;
if (isset($arg['class'])) {
if (is_string($arg['class'])) {
$arg['class'] = array_filter(explode(' ', trim($arg['class'])));
}
foreach ($arg['class'] as $class) {
$attributes['class'][] = $class;
}
unset($arg['class']);
}
$attributes = array_merge($attributes, $arg);
}
if (isset($attributes['class'])) {
$attributes['class'] = implode(' ', $attributes['class']);
}
return $attributes;
}
/**
* @param array<string, mixed> $attributes
* @param list<string> $allowList
*
* @return array<string, mixed>
*/
public static function filterAttributes(array $attributes, array $allowList, bool $allowUnsafeLinks): array
{
$allowList = array_fill_keys($allowList, true);
foreach ($attributes as $name => $value) {
$attrNameLower = strtolower($name);
// Remove any unsafe links
if (! $allowUnsafeLinks && ($attrNameLower === 'href' || $attrNameLower === 'src') && is_string($value) && RegexHelper::isLinkPotentiallyUnsafe($value)) {
unset($attributes[$name]);
continue;
}
// No allowlist?
if ($allowList === []) {
// Just remove JS event handlers
if (str_starts_with($attrNameLower, 'on')) {
unset($attributes[$name]);
}
continue;
}
// Remove any attributes not in that allowlist (case-sensitive)
if (! isset($allowList[$name])) {
unset($attributes[$name]);
}
}
return $attributes;
}
}