138 lines
4.4 KiB
PHP
138 lines
4.4 KiB
PHP
<?php
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/*
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* This file is part of the league/commonmark package.
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*
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* (c) Colin O'Dell <colinodell@gmail.com>
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* (c) 2015 Martin Hasoň <martin.hason@gmail.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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declare(strict_types=1);
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namespace League\CommonMark\Extension\Attributes\Util;
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use League\CommonMark\Node\Node;
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use League\CommonMark\Parser\Cursor;
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use League\CommonMark\Util\RegexHelper;
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/**
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* @internal
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*/
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final class AttributesHelper
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{
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private const SINGLE_ATTRIBUTE = '\s*([.#][_a-z0-9-]+|' . RegexHelper::PARTIAL_ATTRIBUTENAME . RegexHelper::PARTIAL_ATTRIBUTEVALUESPEC . ')\s*';
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private const ATTRIBUTE_LIST = '/^{:?(' . self::SINGLE_ATTRIBUTE . ')+}/i';
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/**
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* @return array<string, mixed>
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*/
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public static function parseAttributes(Cursor $cursor): array
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{
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$state = $cursor->saveState();
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$cursor->advanceToNextNonSpaceOrNewline();
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// Quick check to see if we might have attributes
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if ($cursor->getCharacter() !== '{') {
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$cursor->restoreState($state);
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return [];
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}
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// Attempt to match the entire attribute list expression
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// While this is less performant than checking for '{' now and '}' later, it simplifies
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// matching individual attributes since they won't need to look ahead for the closing '}'
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// while dealing with the fact that attributes can technically contain curly braces.
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// So we'll just match the start and end braces up front.
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$attributeExpression = $cursor->match(self::ATTRIBUTE_LIST);
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if ($attributeExpression === null) {
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$cursor->restoreState($state);
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return [];
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}
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// Trim the leading '{' or '{:' and the trailing '}'
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$attributeExpression = \ltrim(\substr($attributeExpression, 1, -1), ':');
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$attributeCursor = new Cursor($attributeExpression);
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/** @var array<string, mixed> $attributes */
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$attributes = [];
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while ($attribute = \trim((string) $attributeCursor->match('/^' . self::SINGLE_ATTRIBUTE . '/i'))) {
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if ($attribute[0] === '#') {
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$attributes['id'] = \substr($attribute, 1);
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continue;
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}
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if ($attribute[0] === '.') {
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$attributes['class'][] = \substr($attribute, 1);
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continue;
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}
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/** @psalm-suppress PossiblyUndefinedArrayOffset */
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[$name, $value] = \explode('=', $attribute, 2);
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$first = $value[0];
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$last = \substr($value, -1);
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if (($first === '"' && $last === '"') || ($first === "'" && $last === "'") && \strlen($value) > 1) {
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$value = \substr($value, 1, -1);
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}
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if (\strtolower(\trim($name)) === 'class') {
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foreach (\array_filter(\explode(' ', \trim($value))) as $class) {
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$attributes['class'][] = $class;
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}
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} else {
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$attributes[\trim($name)] = \trim($value);
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}
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}
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if (isset($attributes['class'])) {
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$attributes['class'] = \implode(' ', (array) $attributes['class']);
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}
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return $attributes;
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}
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/**
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* @param Node|array<string, mixed> $attributes1
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* @param Node|array<string, mixed> $attributes2
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*
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* @return array<string, mixed>
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*/
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public static function mergeAttributes($attributes1, $attributes2): array
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{
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$attributes = [];
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foreach ([$attributes1, $attributes2] as $arg) {
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if ($arg instanceof Node) {
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$arg = $arg->data->get('attributes');
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}
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/** @var array<string, mixed> $arg */
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$arg = (array) $arg;
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if (isset($arg['class'])) {
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if (\is_string($arg['class'])) {
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$arg['class'] = \array_filter(\explode(' ', \trim($arg['class'])));
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}
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foreach ($arg['class'] as $class) {
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$attributes['class'][] = $class;
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}
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unset($arg['class']);
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}
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$attributes = \array_merge($attributes, $arg);
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}
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if (isset($attributes['class'])) {
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$attributes['class'] = \implode(' ', $attributes['class']);
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}
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return $attributes;
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}
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}
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