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<?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 <[email protected]> |
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* |
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* Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js) |
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* - (c) John MacFarlane |
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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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namespace League\CommonMark\Inline\Parser; |
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use League\CommonMark\Delimiter\Delimiter; |
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use League\CommonMark\Environment; |
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use League\CommonMark\EnvironmentAwareInterface; |
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use League\CommonMark\Inline\Element\Text; |
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use League\CommonMark\InlineParserContext; |
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use League\CommonMark\Util\Configuration; |
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use League\CommonMark\Util\RegexHelper; |
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class EmphasisParser extends AbstractInlineParser implements EnvironmentAwareInterface |
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{ |
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protected $config; |
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public function __construct(array $newConfig = []) |
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{ |
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$this->config = new Configuration([ |
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'use_asterisk' => true, |
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'use_underscore' => true, |
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'enable_em' => true, |
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'enable_strong' => true, |
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]); |
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$this->config->mergeConfig($newConfig); |
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} |
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public function setEnvironment(Environment $environment) |
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{ |
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$this->config->mergeConfig($environment->getConfig()); |
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} |
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/** |
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* @return string[] |
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*/ |
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public function getCharacters() |
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{ |
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if (!$this->config->getConfig('enable_em') && !$this->config->getConfig('enable_strong')) { |
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return []; |
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} |
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$chars = []; |
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if ($this->config->getConfig('use_asterisk')) { |
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$chars[] = '*'; |
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} |
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if ($this->config->getConfig('use_underscore')) { |
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$chars[] = '_'; |
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} |
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return $chars; |
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} |
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/** |
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* @param InlineParserContext $inlineContext |
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* |
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* @return bool |
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*/ |
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public function parse(InlineParserContext $inlineContext) |
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{ |
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$character = $inlineContext->getCursor()->getCharacter(); |
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if (!in_array($character, $this->getCharacters())) { |
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return false; |
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} |
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$numDelims = 0; |
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$cursor = $inlineContext->getCursor(); |
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$charBefore = $cursor->peek(-1); |
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if ($charBefore === null) { |
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$charBefore = "\n"; |
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} |
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while ($cursor->peek($numDelims) === $character) { |
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++$numDelims; |
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} |
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if ($numDelims === 0) { |
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return false; |
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} |
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// Skip single delims if emphasis is disabled |
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if ($numDelims === 1 && !$this->config->getConfig('enable_em')) { |
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return false; |
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} |
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$cursor->advanceBy($numDelims); |
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$charAfter = $cursor->getCharacter(); |
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if ($charAfter === null) { |
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$charAfter = "\n"; |
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} |
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list($canOpen, $canClose) = $this->determineCanOpenOrClose($charBefore, $charAfter, $character); |
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$node = new Text($cursor->getPreviousText(), [ |
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'delim' => true, |
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'emphasis_config' => $this->config, |
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]); |
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$inlineContext->getContainer()->appendChild($node); |
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// Add entry to stack to this opener |
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$delimiter = new Delimiter($character, $numDelims, $node, $canOpen, $canClose); |
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$inlineContext->getDelimiterStack()->push($delimiter); |
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return true; |
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} |
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/** |
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* @param string $charBefore |
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* @param string $charAfter |
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* @param string $character |
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* |
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* @return bool[] |
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*/ |
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private function determineCanOpenOrClose($charBefore, $charAfter, $character) |
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{ |
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$afterIsWhitespace = preg_match(RegexHelper::REGEX_UNICODE_WHITESPACE_CHAR, $charAfter); |
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$afterIsPunctuation = preg_match(RegexHelper::REGEX_PUNCTUATION, $charAfter); |
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$beforeIsWhitespace = preg_match(RegexHelper::REGEX_UNICODE_WHITESPACE_CHAR, $charBefore); |
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$beforeIsPunctuation = preg_match(RegexHelper::REGEX_PUNCTUATION, $charBefore); |
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$leftFlanking = !$afterIsWhitespace && (!$afterIsPunctuation || $beforeIsWhitespace || $beforeIsPunctuation); |
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$rightFlanking = !$beforeIsWhitespace && (!$beforeIsPunctuation || $afterIsWhitespace || $afterIsPunctuation); |
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if ($character === '_') { |
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$canOpen = $leftFlanking && (!$rightFlanking || $beforeIsPunctuation); |
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$canClose = $rightFlanking && (!$leftFlanking || $afterIsPunctuation); |
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} else { |
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$canOpen = $leftFlanking; |
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$canClose = $rightFlanking; |
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} |
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return [$canOpen, $canClose]; |
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} |
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} |
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thephpleague /
commonmark
