527 lines
13 KiB
PHP
527 lines
13 KiB
PHP
<?php
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#
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#
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# Parsedown Extra
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# https://github.com/erusev/parsedown-extra
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#
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# (c) Emanuil Rusev
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# http://erusev.com
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#
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# For the full license information, view the LICENSE file that was distributed
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# with this source code.
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#
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#
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class ParsedownExtra extends Parsedown
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{
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# ~
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const version = '0.7.0';
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# ~
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function __construct()
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{
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if (parent::version < '1.5.0')
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{
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throw new Exception('ParsedownExtra requires a later version of Parsedown');
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}
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$this->BlockTypes[':'] []= 'DefinitionList';
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$this->BlockTypes['*'] []= 'Abbreviation';
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# identify footnote definitions before reference definitions
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array_unshift($this->BlockTypes['['], 'Footnote');
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# identify footnote markers before before links
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array_unshift($this->InlineTypes['['], 'FootnoteMarker');
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}
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#
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# ~
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function text($text)
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{
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$markup = parent::text($text);
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# merge consecutive dl elements
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$markup = preg_replace('/<\/dl>\s+<dl>\s+/', '', $markup);
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# add footnotes
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if (isset($this->DefinitionData['Footnote']))
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{
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$Element = $this->buildFootnoteElement();
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$markup .= "\n" . $this->element($Element);
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}
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return $markup;
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}
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#
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# Blocks
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#
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#
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# Abbreviation
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protected function blockAbbreviation($Line)
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{
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if (preg_match('/^\*\[(.+?)\]:[ ]*(.+?)[ ]*$/', $Line['text'], $matches))
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{
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$this->DefinitionData['Abbreviation'][$matches[1]] = $matches[2];
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$Block = array(
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'hidden' => true,
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);
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return $Block;
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}
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}
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#
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# Footnote
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protected function blockFootnote($Line)
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{
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if (preg_match('/^\[\^(.+?)\]:[ ]?(.*)$/', $Line['text'], $matches))
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{
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$Block = array(
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'label' => $matches[1],
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'text' => $matches[2],
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'hidden' => true,
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);
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return $Block;
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}
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}
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protected function blockFootnoteContinue($Line, $Block)
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{
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if ($Line['text'][0] === '[' and preg_match('/^\[\^(.+?)\]:/', $Line['text']))
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{
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return;
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}
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if (isset($Block['interrupted']))
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{
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if ($Line['indent'] >= 4)
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{
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$Block['text'] .= "\n\n" . $Line['text'];
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return $Block;
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}
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}
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else
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{
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$Block['text'] .= "\n" . $Line['text'];
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return $Block;
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}
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}
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protected function blockFootnoteComplete($Block)
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{
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$this->DefinitionData['Footnote'][$Block['label']] = array(
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'text' => $Block['text'],
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'count' => null,
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'number' => null,
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);
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return $Block;
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}
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#
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# Definition List
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protected function blockDefinitionList($Line, $Block)
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{
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if ( ! isset($Block) or isset($Block['type']))
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{
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return;
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}
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$Element = array(
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'name' => 'dl',
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'handler' => 'elements',
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'text' => array(),
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);
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$terms = explode("\n", $Block['element']['text']);
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foreach ($terms as $term)
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{
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$Element['text'] []= array(
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'name' => 'dt',
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'handler' => 'line',
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'text' => $term,
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);
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}
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$Block['element'] = $Element;
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$Block = $this->addDdElement($Line, $Block);
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return $Block;
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}
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protected function blockDefinitionListContinue($Line, array $Block)
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{
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if ($Line['text'][0] === ':')
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{
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$Block = $this->addDdElement($Line, $Block);
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return $Block;
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}
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else
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{
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if (isset($Block['interrupted']) and $Line['indent'] === 0)
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{
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return;
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}
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if (isset($Block['interrupted']))
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{
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$Block['dd']['handler'] = 'text';
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$Block['dd']['text'] .= "\n\n";
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unset($Block['interrupted']);
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}
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$text = substr($Line['body'], min($Line['indent'], 4));
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$Block['dd']['text'] .= "\n" . $text;
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return $Block;
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}
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}
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#
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# Header
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protected function blockHeader($Line)
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{
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$Block = parent::blockHeader($Line);
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if (preg_match('/[ #]*{('.$this->regexAttribute.'+)}[ ]*$/', $Block['element']['text'], $matches, PREG_OFFSET_CAPTURE))
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{
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$attributeString = $matches[1][0];
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$Block['element']['attributes'] = $this->parseAttributeData($attributeString);
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$Block['element']['text'] = substr($Block['element']['text'], 0, $matches[0][1]);
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}
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return $Block;
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}
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#
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# Markup
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protected function blockMarkupComplete($Block)
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{
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if ( ! isset($Block['void']))
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{
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$Block['markup'] = $this->processTag($Block['markup']);
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}
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return $Block;
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}
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#
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# Setext
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protected function blockSetextHeader($Line, array $Block = null)
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{
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$Block = parent::blockSetextHeader($Line, $Block);
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if (preg_match('/[ ]*{('.$this->regexAttribute.'+)}[ ]*$/', $Block['element']['text'], $matches, PREG_OFFSET_CAPTURE))
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{
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$attributeString = $matches[1][0];
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$Block['element']['attributes'] = $this->parseAttributeData($attributeString);
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$Block['element']['text'] = substr($Block['element']['text'], 0, $matches[0][1]);
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}
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return $Block;
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}
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#
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# Inline Elements
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#
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#
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# Footnote Marker
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protected function inlineFootnoteMarker($Excerpt)
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{
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if (preg_match('/^\[\^(.+?)\]/', $Excerpt['text'], $matches))
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{
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$name = $matches[1];
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if ( ! isset($this->DefinitionData['Footnote'][$name]))
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{
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return;
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}
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$this->DefinitionData['Footnote'][$name]['count'] ++;
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if ( ! isset($this->DefinitionData['Footnote'][$name]['number']))
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{
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$this->DefinitionData['Footnote'][$name]['number'] = ++ $this->footnoteCount; # » &
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}
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$Element = array(
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'name' => 'sup',
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'attributes' => array('id' => 'fnref'.$this->DefinitionData['Footnote'][$name]['count'].':'.$name),
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'handler' => 'element',
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'text' => array(
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'name' => 'a',
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'attributes' => array('href' => '#fn:'.$name, 'class' => 'footnote-ref'),
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'text' => $this->DefinitionData['Footnote'][$name]['number'],
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),
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);
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return array(
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'extent' => strlen($matches[0]),
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'element' => $Element,
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);
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}
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}
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private $footnoteCount = 0;
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#
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# Link
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protected function inlineLink($Excerpt)
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{
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$Link = parent::inlineLink($Excerpt);
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$remainder = substr($Excerpt['text'], $Link['extent']);
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if (preg_match('/^[ ]*{('.$this->regexAttribute.'+)}/', $remainder, $matches))
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{
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$Link['element']['attributes'] += $this->parseAttributeData($matches[1]);
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$Link['extent'] += strlen($matches[0]);
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}
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return $Link;
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}
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#
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# ~
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#
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protected function unmarkedText($text)
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{
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$text = parent::unmarkedText($text);
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if (isset($this->DefinitionData['Abbreviation']))
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{
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foreach ($this->DefinitionData['Abbreviation'] as $abbreviation => $meaning)
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{
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$pattern = '/\b'.preg_quote($abbreviation, '/').'\b/';
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$text = preg_replace($pattern, '<abbr title="'.$meaning.'">'.$abbreviation.'</abbr>', $text);
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}
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}
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return $text;
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}
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#
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# Util Methods
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#
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protected function addDdElement(array $Line, array $Block)
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{
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$text = substr($Line['text'], 1);
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$text = trim($text);
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unset($Block['dd']);
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$Block['dd'] = array(
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'name' => 'dd',
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'handler' => 'line',
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'text' => $text,
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);
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if (isset($Block['interrupted']))
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{
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$Block['dd']['handler'] = 'text';
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unset($Block['interrupted']);
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}
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$Block['element']['text'] []= & $Block['dd'];
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return $Block;
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}
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protected function buildFootnoteElement()
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{
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$Element = array(
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'name' => 'div',
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'attributes' => array('class' => 'footnotes'),
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'handler' => 'elements',
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'text' => array(
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array(
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'name' => 'hr',
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),
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array(
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'name' => 'ol',
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'handler' => 'elements',
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'text' => array(),
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),
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),
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);
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uasort($this->DefinitionData['Footnote'], 'self::sortFootnotes');
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foreach ($this->DefinitionData['Footnote'] as $definitionId => $DefinitionData)
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{
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if ( ! isset($DefinitionData['number']))
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{
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continue;
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}
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$text = $DefinitionData['text'];
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$text = parent::text($text);
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$numbers = range(1, $DefinitionData['count']);
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$backLinksMarkup = '';
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foreach ($numbers as $number)
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{
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$backLinksMarkup .= ' <a href="#fnref'.$number.':'.$definitionId.'" rev="footnote" class="footnote-backref">↩</a>';
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}
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$backLinksMarkup = substr($backLinksMarkup, 1);
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if (substr($text, - 4) === '</p>')
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{
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$backLinksMarkup = ' '.$backLinksMarkup;
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$text = substr_replace($text, $backLinksMarkup.'</p>', - 4);
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}
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else
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{
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$text .= "\n".'<p>'.$backLinksMarkup.'</p>';
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}
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$Element['text'][1]['text'] []= array(
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'name' => 'li',
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'attributes' => array('id' => 'fn:'.$definitionId),
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'text' => "\n".$text."\n",
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);
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}
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return $Element;
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}
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# ~
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protected function parseAttributeData($attributeString)
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{
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$Data = array();
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$attributes = preg_split('/[ ]+/', $attributeString, - 1, PREG_SPLIT_NO_EMPTY);
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foreach ($attributes as $attribute)
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{
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if ($attribute[0] === '#')
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{
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$Data['id'] = substr($attribute, 1);
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}
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else # "."
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{
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$classes []= substr($attribute, 1);
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}
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}
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if (isset($classes))
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{
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$Data['class'] = implode(' ', $classes);
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}
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return $Data;
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}
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# ~
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protected function processTag($elementMarkup) # recursive
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{
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# http://stackoverflow.com/q/1148928/200145
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libxml_use_internal_errors(true);
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$DOMDocument = new DOMDocument;
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# http://stackoverflow.com/q/11309194/200145
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$elementMarkup = mb_convert_encoding($elementMarkup, 'HTML-ENTITIES', 'UTF-8');
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# http://stackoverflow.com/q/4879946/200145
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$DOMDocument->loadHTML($elementMarkup);
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$DOMDocument->removeChild($DOMDocument->doctype);
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$DOMDocument->replaceChild($DOMDocument->firstChild->firstChild->firstChild, $DOMDocument->firstChild);
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$elementText = '';
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if ($DOMDocument->documentElement->getAttribute('markdown') === '1')
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{
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foreach ($DOMDocument->documentElement->childNodes as $Node)
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{
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$elementText .= $DOMDocument->saveHTML($Node);
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}
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$DOMDocument->documentElement->removeAttribute('markdown');
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$elementText = "\n".$this->text($elementText)."\n";
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}
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else
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{
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foreach ($DOMDocument->documentElement->childNodes as $Node)
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{
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$nodeMarkup = $DOMDocument->saveHTML($Node);
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if ($Node instanceof DOMElement and ! in_array($Node->nodeName, $this->textLevelElements))
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{
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$elementText .= $this->processTag($nodeMarkup);
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}
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else
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{
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$elementText .= $nodeMarkup;
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}
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}
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}
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# because we don't want for markup to get encoded
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$DOMDocument->documentElement->nodeValue = 'placeholder\x1A';
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$markup = $DOMDocument->saveHTML($DOMDocument->documentElement);
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$markup = str_replace('placeholder\x1A', $elementText, $markup);
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return $markup;
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}
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# ~
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protected function sortFootnotes($A, $B) # callback
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{
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return $A['number'] - $B['number'];
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}
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#
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# Fields
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#
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protected $regexAttribute = '(?:[#.][-\w]+[ ]*)';
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}
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