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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2020 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\Passes; |
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use s9e\TextFormatter\Plugins\Litedown\Parser\LinkAttributesSetter; |
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class Links extends AbstractPass |
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{ |
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use LinkAttributesSetter; |
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/** |
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* {@inheritdoc} |
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*/ |
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public function parse() |
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{ |
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if ($this->text->indexOf('](') !== false) |
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{ |
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$this->parseInlineLinks(); |
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} |
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if ($this->text->indexOf('<') !== false) |
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{ |
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$this->parseAutomaticLinks(); |
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} |
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if ($this->text->hasReferences) |
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{ |
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$this->parseReferenceLinks(); |
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} |
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} |
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/** |
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* Add an image tag for given text span |
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* |
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* @param integer $startPos Start tag position |
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* @param integer $endPos End tag position |
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* @param integer $endLen End tag length |
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* @param string $linkInfo URL optionally followed by space and a title |
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* @return void |
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*/ |
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protected function addLinkTag($startPos, $endPos, $endLen, $linkInfo) |
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{ |
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// Give the link a slightly worse priority if this is a implicit reference and a slightly |
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// better priority if it's an explicit reference or an inline link or to give it precedence |
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// over possible BBCodes such as [b](https://en.wikipedia.org/wiki/B) |
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$priority = ($endLen === 1) ? 1 : -1; |
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$tag = $this->parser->addTagPair('URL', $startPos, 1, $endPos, $endLen, $priority); |
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$this->setLinkAttributes($tag, $linkInfo, 'url'); |
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// Overwrite the markup without touching the link's text |
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$this->text->overwrite($startPos, 1); |
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$this->text->overwrite($endPos, $endLen); |
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} |
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/** |
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* Capture and return labels used in current text |
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* |
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* @return array Labels' text position as keys, lowercased text content as values |
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*/ |
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protected function getLabels() |
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{ |
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preg_match_all( |
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'/\\[((?:[^\\x17[\\]]|\\[[^\\x17[\\]]*\\])*)\\]/', |
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$this->text, |
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$matches, |
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PREG_OFFSET_CAPTURE |
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); |
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$labels = []; |
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foreach ($matches[1] as $m) |
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{ |
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$labels[$m[1] - 1] = strtolower($m[0]); |
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} |
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return $labels; |
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} |
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/** |
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* Parse automatic links markup |
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* |
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* @return void |
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*/ |
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protected function parseAutomaticLinks() |
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{ |
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preg_match_all( |
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'/<[-+.\\w]++([:@])[^\\x17\\s>]+?(?:>|\\x1B7)/', |
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$this->text, |
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$matches, |
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PREG_OFFSET_CAPTURE |
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); |
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foreach ($matches[0] as $i => $m) |
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{ |
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// Re-escape escape sequences in automatic links |
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$content = substr($this->text->decode(str_replace("\x1B", "\\\x1B", $m[0])), 1, -1); |
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$startPos = $m[1]; |
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$endPos = $startPos + strlen($m[0]) - 1; |
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$tagName = ($matches[1][$i][0] === ':') ? 'URL' : 'EMAIL'; |
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$attrName = strtolower($tagName); |
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$this->parser->addTagPair($tagName, $startPos, 1, $endPos, 1) |
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->setAttribute($attrName, $content); |
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} |
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} |
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/** |
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* Parse inline links markup |
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* |
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* @return void |
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*/ |
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protected function parseInlineLinks() |
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{ |
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preg_match_all( |
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'/\\[(?:[^\\x17[\\]]|\\[[^\\x17[\\]]*\\])*\\]\\(( *(?:[^\\x17\\s()]|\\([^\\x17\\s()]*\\))*(?=[ )]) *(?:"[^\\x17]*?"|\'[^\\x17]*?\'|\\([^\\x17)]*\\))? *)\\)/', |
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$this->text, |
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$matches, |
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PREG_OFFSET_CAPTURE | PREG_SET_ORDER |
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); |
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foreach ($matches as $m) |
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{ |
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$linkInfo = $m[1][0]; |
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$startPos = $m[0][1]; |
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$endLen = 3 + strlen($linkInfo); |
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$endPos = $startPos + strlen($m[0][0]) - $endLen; |
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$this->addLinkTag($startPos, $endPos, $endLen, $linkInfo); |
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} |
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} |
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/** |
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* Parse reference links markup |
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* |
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* @return void |
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*/ |
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protected function parseReferenceLinks() |
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{ |
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$labels = $this->getLabels(); |
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foreach ($labels as $startPos => $id) |
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{ |
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$labelPos = $startPos + 2 + strlen($id); |
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$endPos = $labelPos - 1; |
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$endLen = 1; |
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if ($this->text->charAt($labelPos) === ' ') |
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{ |
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++$labelPos; |
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} |
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if (isset($labels[$labelPos], $this->text->linkReferences[$labels[$labelPos]])) |
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{ |
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$id = $labels[$labelPos]; |
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$endLen = $labelPos + 2 + strlen($id) - $endPos; |
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} |
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if (isset($this->text->linkReferences[$id])) |
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{ |
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$this->addLinkTag($startPos, $endPos, $endLen, $this->text->linkReferences[$id]); |
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} |
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} |
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} |
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} |
s9e /
TextFormatter
