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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2017 The s9e Authors |
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License |
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*/ |
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namespace s9e\TextFormatter\Plugins\Litedown\Parser; |
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class Emphasis extends AbstractParser |
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{ |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function execute() |
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{ |
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$this->matchEmphasisByCharacter('*', '/\\*+/'); |
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$this->matchEmphasisByCharacter('_', '/_+/'); |
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} |
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/** |
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* Match emphasis and strong applied using given character |
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* |
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* @param string $character Markup character, either * or _ |
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* @param string $regexp Regexp used to match the series of emphasis character |
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* @return void |
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*/ |
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protected function matchEmphasisByCharacter($character, $regexp) |
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{ |
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$pos = strpos($this->text, $character); |
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if ($pos === false) |
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{ |
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return; |
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} |
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foreach ($this->getEmphasisByBlock($regexp, $pos) as $block) |
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{ |
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$this->processEmphasisBlock($block); |
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} |
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} |
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/** |
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* Get emphasis markup split by block |
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* |
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* @param string $regexp Regexp used to match emphasis |
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* @param integer $pos Position in the text of the first emphasis character |
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* @return array[] Each array contains a list of [matchPos, matchLen] pairs |
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*/ |
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protected function getEmphasisByBlock($regexp, $pos) |
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{ |
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$block = []; |
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$blocks = []; |
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$breakPos = strpos($this->text, "\x17", $pos); |
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preg_match_all($regexp, $this->text, $matches, PREG_OFFSET_CAPTURE, $pos); |
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foreach ($matches[0] as $m) |
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{ |
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$matchPos = $m[1]; |
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$matchLen = strlen($m[0]); |
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// Test whether we've just passed the limits of a block |
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if ($matchPos > $breakPos) |
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{ |
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$blocks[] = $block; |
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$block = []; |
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$breakPos = strpos($this->text, "\x17", $matchPos); |
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} |
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// Test whether we should ignore this markup |
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if (!$this->ignoreEmphasis($matchPos, $matchLen)) |
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{ |
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$block[] = [$matchPos, $matchLen]; |
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} |
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} |
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$blocks[] = $block; |
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return $blocks; |
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} |
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/** |
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* Test whether emphasis should be ignored at the given position in the text |
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* |
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* @param integer $matchPos Position of the emphasis in the text |
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* @param integer $matchLen Length of the emphasis |
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* @return bool |
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*/ |
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protected function ignoreEmphasis($matchPos, $matchLen) |
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{ |
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// Ignore single underscores between alphanumeric characters |
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return ($this->text[$matchPos] === '_' && $matchLen === 1 && $this->isSurroundedByAlnum($matchPos, $matchLen)); |
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} |
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/** |
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* Process a list of emphasis markup strings |
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* |
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* @param array[] $block List of [matchPos, matchLen] pairs |
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* @return void |
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*/ |
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protected function processEmphasisBlock(array $block) |
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{ |
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$emPos = null; |
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$strongPos = null; |
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foreach ($block as list($matchPos, $matchLen)) |
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{ |
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$canOpen = !$this->isBeforeWhitespace($matchPos + $matchLen - 1); |
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$canClose = !$this->isAfterWhitespace($matchPos); |
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$closeLen = ($canClose) ? min($matchLen, 3) : 0; |
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$closeEm = ($closeLen & 1) && isset($emPos); |
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$closeStrong = ($closeLen & 2) && isset($strongPos); |
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$emEndPos = $matchPos; |
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$strongEndPos = $matchPos; |
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$remaining = $matchLen; |
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if (isset($emPos) && $emPos === $strongPos) |
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{ |
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if ($closeEm) |
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{ |
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$emPos += 2; |
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} |
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else |
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{ |
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++$strongPos; |
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} |
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} |
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if ($closeEm && $closeStrong) |
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{ |
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if ($emPos < $strongPos) |
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{ |
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$emEndPos += 2; |
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} |
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else |
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{ |
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++$strongEndPos; |
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} |
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} |
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if ($closeEm) |
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{ |
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--$remaining; |
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$this->parser->addTagPair('EM', $emPos, 1, $emEndPos, 1); |
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$emPos = null; |
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} |
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if ($closeStrong) |
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{ |
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$remaining -= 2; |
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$this->parser->addTagPair('STRONG', $strongPos, 2, $strongEndPos, 2); |
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$strongPos = null; |
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} |
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if ($canOpen) |
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{ |
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$remaining = min($remaining, 3); |
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if ($remaining & 1) |
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{ |
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$emPos = $matchPos + $matchLen - $remaining; |
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} |
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if ($remaining & 2) |
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{ |
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$strongPos = $matchPos + $matchLen - $remaining; |
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} |
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} |
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} |
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} |
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} |
s9e /
TextFormatter
