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Parsedown.php
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Parsedown.php
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<?php
#
#
# Parsedown
# http://parsedown.org
#
# (c) Emanuil Rusev
# http://erusev.com
#
# For the full license information, view the LICENSE file that was distributed
# with this source code.
#
#
class Parsedown
{
# ~
const version = '1.6.0';
# ~
function text($text)
{
# make sure no definitions are set
$this->DefinitionData = array();
# standardize line breaks
$text = str_replace(array("\r\n", "\r"), "\n", $text);
# remove surrounding line breaks
$text = trim($text, "\n");
# split text into lines
$lines = explode("\n", $text);
# iterate through lines to identify blocks
$markup = $this->lines($lines);
# trim line breaks
$markup = trim($markup, "\n");
return $markup;
}
#
# Setters
#
function setBreaksEnabled($breaksEnabled)
{
$this->breaksEnabled = $breaksEnabled;
return $this;
}
protected $breaksEnabled;
function setMarkupEscaped($markupEscaped)
{
$this->markupEscaped = $markupEscaped;
return $this;
}
protected $markupEscaped;
function setUrlsLinked($urlsLinked)
{
$this->urlsLinked = $urlsLinked;
return $this;
}
protected $urlsLinked = true;
#
# Lines
#
protected $BlockTypes = array(
'#' => array('Header'),
'*' => array('Rule', 'List'),
'+' => array('List'),
'-' => array('SetextHeader', 'Table', 'Rule', 'List'),
'0' => array('List'),
'1' => array('List'),
'2' => array('List'),
'3' => array('List'),
'4' => array('List'),
'5' => array('List'),
'6' => array('List'),
'7' => array('List'),
'8' => array('List'),
'9' => array('List'),
':' => array('Table'),
'<' => array('Comment', 'Markup'),
'=' => array('SetextHeader'),
'>' => array('Quote'),
'[' => array('Reference'),
'_' => array('Rule'),
'`' => array('FencedCode'),
'|' => array('Table'),
'~' => array('FencedCode'),
);
# ~
protected $unmarkedBlockTypes = array(
'Code',
);
#
# Blocks
#
protected function lines(array $lines)
{
$CurrentBlock = null;
foreach ($lines as $line)
{
if (chop($line) === '')
{
if (isset($CurrentBlock))
{
$CurrentBlock['interrupted'] = true;
}
continue;
}
if (strpos($line, "\t") !== false)
{
$parts = explode("\t", $line);
$line = $parts[0];
unset($parts[0]);
foreach ($parts as $part)
{
$shortage = 4 - mb_strlen($line, 'utf-8') % 4;
$line .= str_repeat(' ', $shortage);
$line .= $part;
}
}
$indent = 0;
while (isset($line[$indent]) and $line[$indent] === ' ')
{
$indent ++;
}
$text = $indent > 0 ? substr($line, $indent) : $line;
# ~
$Line = array('body' => $line, 'indent' => $indent, 'text' => $text);
# ~
if (isset($CurrentBlock['continuable']))
{
$Block = $this->{'block'.$CurrentBlock['type'].'Continue'}($Line, $CurrentBlock);
if (isset($Block))
{
$CurrentBlock = $Block;
continue;
}
else
{
if ($this->isBlockCompletable($CurrentBlock['type']))
{
$CurrentBlock = $this->{'block'.$CurrentBlock['type'].'Complete'}($CurrentBlock);
}
}
}
# ~
$marker = $text[0];
# ~
$blockTypes = $this->unmarkedBlockTypes;
if (isset($this->BlockTypes[$marker]))
{
foreach ($this->BlockTypes[$marker] as $blockType)
{
$blockTypes []= $blockType;
}
}
#
# ~
foreach ($blockTypes as $blockType)
{
$Block = $this->{'block'.$blockType}($Line, $CurrentBlock);
if (isset($Block))
{
$Block['type'] = $blockType;
if ( ! isset($Block['identified']))
{
$Blocks []= $CurrentBlock;
$Block['identified'] = true;
}
if ($this->isBlockContinuable($blockType))
{
$Block['continuable'] = true;
}
$CurrentBlock = $Block;
continue 2;
}
}
# ~
if (isset($CurrentBlock) and ! isset($CurrentBlock['type']) and ! isset($CurrentBlock['interrupted']))
{
$CurrentBlock['element']['text'] .= "\n".$text;
}
else
{
$Blocks []= $CurrentBlock;
$CurrentBlock = $this->paragraph($Line);
$CurrentBlock['identified'] = true;
}
}
# ~
if (isset($CurrentBlock['continuable']) and $this->isBlockCompletable($CurrentBlock['type']))
{
$CurrentBlock = $this->{'block'.$CurrentBlock['type'].'Complete'}($CurrentBlock);
}
# ~
$Blocks []= $CurrentBlock;
unset($Blocks[0]);
# ~
$markup = '';
foreach ($Blocks as $Block)
{
if (isset($Block['hidden']))
{
continue;
}
$markup .= "\n";
$markup .= isset($Block['markup']) ? $Block['markup'] : $this->element($Block['element']);
}
$markup .= "\n";
# ~
return $markup;
}
protected function isBlockContinuable($Type)
{
return method_exists($this, 'block'.$Type.'Continue');
}
protected function isBlockCompletable($Type)
{
return method_exists($this, 'block'.$Type.'Complete');
}
#
# Code
protected function blockCode($Line, $Block = null)
{
if (isset($Block) and ! isset($Block['type']) and ! isset($Block['interrupted']))
{
return;
}
if ($Line['indent'] >= 4)
{
$text = substr($Line['body'], 4);
$Block = array(
'element' => array(
'name' => 'pre',
'handler' => 'element',
'text' => array(
'name' => 'code',
'text' => $text,
),
),
);
return $Block;
}
}
protected function blockCodeContinue($Line, $Block)
{
if ($Line['indent'] >= 4)
{
if (isset($Block['interrupted']))
{
$Block['element']['text']['text'] .= "\n";
unset($Block['interrupted']);
}
$Block['element']['text']['text'] .= "\n";
$text = substr($Line['body'], 4);
$Block['element']['text']['text'] .= $text;
return $Block;
}
}
protected function blockCodeComplete($Block)
{
$text = $Block['element']['text']['text'];
$text = htmlspecialchars($text, ENT_NOQUOTES, 'UTF-8');
$Block['element']['text']['text'] = $text;
return $Block;
}
#
# Comment
protected function blockComment($Line)
{
if ($this->markupEscaped)
{
return;
}
if (isset($Line['text'][3]) and $Line['text'][3] === '-' and $Line['text'][2] === '-' and $Line['text'][1] === '!')
{
$Block = array(
'markup' => $Line['body'],
);
if (preg_match('/-->$/', $Line['text']))
{
$Block['closed'] = true;
}
return $Block;
}
}
protected function blockCommentContinue($Line, array $Block)
{
if (isset($Block['closed']))
{
return;
}
$Block['markup'] .= "\n" . $Line['body'];
if (preg_match('/-->$/', $Line['text']))
{
$Block['closed'] = true;
}
return $Block;
}
#
# Fenced Code
protected function blockFencedCode($Line)
{
if (preg_match('/^['.$Line['text'][0].']{3,}[ ]*([\w-]+)?[ ]*$/', $Line['text'], $matches))
{
$Element = array(
'name' => 'code',
'text' => '',
);
if (isset($matches[1]))
{
$class = 'language-'.$matches[1];
$Element['attributes'] = array(
'class' => $class,
);
}
$Block = array(
'char' => $Line['text'][0],
'element' => array(
'name' => 'pre',
'handler' => 'element',
'text' => $Element,
),
);
return $Block;
}
}
protected function blockFencedCodeContinue($Line, $Block)
{
if (isset($Block['complete']))
{
return;
}
if (isset($Block['interrupted']))
{
$Block['element']['text']['text'] .= "\n";
unset($Block['interrupted']);
}
if (preg_match('/^'.$Block['char'].'{3,}[ ]*$/', $Line['text']))
{
$Block['element']['text']['text'] = substr($Block['element']['text']['text'], 1);
$Block['complete'] = true;
return $Block;
}
$Block['element']['text']['text'] .= "\n".$Line['body'];
return $Block;
}
protected function blockFencedCodeComplete($Block)
{
$text = $Block['element']['text']['text'];
$text = htmlspecialchars($text, ENT_NOQUOTES, 'UTF-8');
$Block['element']['text']['text'] = $text;
return $Block;
}
#
# Header
protected function blockHeader($Line)
{
if (isset($Line['text'][1]))
{
$level = 1;
while (isset($Line['text'][$level]) and $Line['text'][$level] === '#')
{
$level ++;
}
if ($level > 6)
{
return;
}
$text = trim($Line['text'], '# ');
$Block = array(
'element' => array(
'name' => 'h' . min(6, $level),
'text' => $text,
'handler' => 'line',
),
);
return $Block;
}
}
#
# List
protected function blockList($Line)
{
list($name, $pattern) = $Line['text'][0] <= '-' ? array('ul', '[*+-]') : array('ol', '[0-9]+[.]');
if (preg_match('/^('.$pattern.'[ ]+)(.*)/', $Line['text'], $matches))
{
$Block = array(
'indent' => $Line['indent'],
'pattern' => $pattern,
'element' => array(
'name' => $name,
'handler' => 'elements',
),
);
if($name === 'ol')
{
$listStart = stristr($matches[0], '.', true);
if($listStart !== '1')
{
$Block['element']['attributes'] = array('start' => $listStart);
}
}
$Block['li'] = array(
'name' => 'li',
'handler' => 'li',
'text' => array(
$matches[2],
),
);
$Block['element']['text'] []= & $Block['li'];
return $Block;
}
}
protected function blockListContinue($Line, array $Block)
{
if ($Block['indent'] === $Line['indent'] and preg_match('/^'.$Block['pattern'].'(?:[ ]+(.*)|$)/', $Line['text'], $matches))
{
if (isset($Block['interrupted']))
{
$Block['li']['text'] []= '';
unset($Block['interrupted']);
}
unset($Block['li']);
$text = isset($matches[1]) ? $matches[1] : '';
$Block['li'] = array(
'name' => 'li',
'handler' => 'li',
'text' => array(
$text,
),
);
$Block['element']['text'] []= & $Block['li'];
return $Block;
}
if ($Line['text'][0] === '[' and $this->blockReference($Line))
{
return $Block;
}
if ( ! isset($Block['interrupted']))
{
$text = preg_replace('/^[ ]{0,4}/', '', $Line['body']);
$Block['li']['text'] []= $text;
return $Block;
}
if ($Line['indent'] > 0)
{
$Block['li']['text'] []= '';
$text = preg_replace('/^[ ]{0,4}/', '', $Line['body']);
$Block['li']['text'] []= $text;
unset($Block['interrupted']);
return $Block;
}
}
#
# Quote
protected function blockQuote($Line)
{
if (preg_match('/^>[ ]?(.*)/', $Line['text'], $matches))
{
$Block = array(
'element' => array(
'name' => 'blockquote',
'handler' => 'lines',
'text' => (array) $matches[1],
),
);
return $Block;
}
}
protected function blockQuoteContinue($Line, array $Block)
{
if ($Line['text'][0] === '>' and preg_match('/^>[ ]?(.*)/', $Line['text'], $matches))
{
if (isset($Block['interrupted']))
{
$Block['element']['text'] []= '';
unset($Block['interrupted']);
}
$Block['element']['text'] []= $matches[1];
return $Block;
}
if ( ! isset($Block['interrupted']))
{
$Block['element']['text'] []= $Line['text'];
return $Block;
}
}
#
# Rule
protected function blockRule($Line)
{
if (preg_match('/^(['.$Line['text'][0].'])([ ]*\1){2,}[ ]*$/', $Line['text']))
{
$Block = array(
'element' => array(
'name' => 'hr'
),
);
return $Block;
}
}
#
# Setext
protected function blockSetextHeader($Line, array $Block = null)
{
if ( ! isset($Block) or isset($Block['type']) or isset($Block['interrupted']))
{
return;
}
if (chop($Line['text'], $Line['text'][0]) === '')
{
$Block['element']['name'] = $Line['text'][0] === '=' ? 'h1' : 'h2';
return $Block;
}
}
#
# Markup
protected function blockMarkup($Line)
{
if ($this->markupEscaped)
{
return;
}
if (preg_match('/^<(\w[\w-]*)(?:[ ]*'.$this->regexHtmlAttribute.')*[ ]*(\/)?>/', $Line['text'], $matches))
{
$element = strtolower($matches[1]);
if (in_array($element, $this->textLevelElements))
{
return;
}
$Block = array(
'name' => $matches[1],
'depth' => 0,
'markup' => $Line['text'],
);
$length = strlen($matches[0]);
$remainder = substr($Line['text'], $length);
if (trim($remainder) === '')
{
if (isset($matches[2]) or in_array($matches[1], $this->voidElements))
{
$Block['closed'] = true;
$Block['void'] = true;
}
}
else
{
if (isset($matches[2]) or in_array($matches[1], $this->voidElements))
{
return;
}
if (preg_match('/<\/'.$matches[1].'>[ ]*$/i', $remainder))
{
$Block['closed'] = true;
}
}
return $Block;
}
}
protected function blockMarkupContinue($Line, array $Block)
{
if (isset($Block['closed']))
{
return;
}
if (preg_match('/^<'.$Block['name'].'(?:[ ]*'.$this->regexHtmlAttribute.')*[ ]*>/i', $Line['text'])) # open
{
$Block['depth'] ++;
}
if (preg_match('/(.*?)<\/'.$Block['name'].'>[ ]*$/i', $Line['text'], $matches)) # close
{
if ($Block['depth'] > 0)
{
$Block['depth'] --;
}
else
{
$Block['closed'] = true;
}
}
if (isset($Block['interrupted']))
{
$Block['markup'] .= "\n";
unset($Block['interrupted']);
}
$Block['markup'] .= "\n".$Line['body'];
return $Block;
}
#
# Reference
protected function blockReference($Line)
{
if (preg_match('/^\[(.+?)\]:[ ]*<?(\S+?)>?(?:[ ]+["\'(](.+)["\')])?[ ]*$/', $Line['text'], $matches))
{
$id = strtolower($matches[1]);
$Data = array(
'url' => $matches[2],
'title' => null,
);
if (isset($matches[3]))
{
$Data['title'] = $matches[3];
}
$this->DefinitionData['Reference'][$id] = $Data;
$Block = array(
'hidden' => true,
);
return $Block;
}
}
#
# Table
protected function blockTable($Line, array $Block = null)
{
if ( ! isset($Block) or isset($Block['type']) or isset($Block['interrupted']))
{
return;
}
if (strpos($Block['element']['text'], '|') !== false and chop($Line['text'], ' -:|') === '')
{
$alignments = array();
$divider = $Line['text'];
$divider = trim($divider);
$divider = trim($divider, '|');
$dividerCells = explode('|', $divider);
foreach ($dividerCells as $dividerCell)
{
$dividerCell = trim($dividerCell);
if ($dividerCell === '')
{
continue;
}
$alignment = null;
if ($dividerCell[0] === ':')
{
$alignment = 'left';
}
if (substr($dividerCell, - 1) === ':')
{
$alignment = $alignment === 'left' ? 'center' : 'right';
}
$alignments []= $alignment;
}
# ~
$HeaderElements = array();
$header = $Block['element']['text'];
$header = trim($header);
$header = trim($header, '|');
$headerCells = explode('|', $header);
foreach ($headerCells as $index => $headerCell)
{
$headerCell = trim($headerCell);
$HeaderElement = array(
'name' => 'th',
'text' => $headerCell,
'handler' => 'line',
);
if (isset($alignments[$index]))
{
$alignment = $alignments[$index];
$HeaderElement['attributes'] = array(
'style' => 'text-align: '.$alignment.';',
);
}
$HeaderElements []= $HeaderElement;
}
# ~
$Block = array(
'alignments' => $alignments,
'identified' => true,
'element' => array(
'name' => 'table',
'handler' => 'elements',
),
);
$Block['element']['text'] []= array(
'name' => 'thead',
'handler' => 'elements',
);
$Block['element']['text'] []= array(
'name' => 'tbody',
'handler' => 'elements',
'text' => array(),
);
$Block['element']['text'][0]['text'] []= array(
'name' => 'tr',
'handler' => 'elements',
'text' => $HeaderElements,
);
return $Block;
}
}
protected function blockTableContinue($Line, array $Block)
{
if (isset($Block['interrupted']))
{
return;
}
if ($Line['text'][0] === '|' or strpos($Line['text'], '|'))
{
$Elements = array();
$row = $Line['text'];
$row = trim($row);
$row = trim($row, '|');
preg_match_all('/(?:(\\\\[|])|[^|`]|`[^`]+`|`)+/', $row, $matches);
foreach ($matches[0] as $index => $cell)
{
$cell = trim($cell);
$Element = array(
'name' => 'td',
'handler' => 'line',
'text' => $cell,
);
if (isset($Block['alignments'][$index]))
{
$Element['attributes'] = array(
'style' => 'text-align: '.$Block['alignments'][$index].';',
);
}
$Elements []= $Element;
}
$Element = array(
'name' => 'tr',
'handler' => 'elements',
'text' => $Elements,
);
$Block['element']['text'][1]['text'] []= $Element;
return $Block;
}
}
#
# ~
#
protected function paragraph($Line)
{
$Block = array(
'element' => array(
'name' => 'p',
'text' => $Line['text'],
'handler' => 'line',
),
);
return $Block;
}
#
# Inline Elements
#
protected $InlineTypes = array(
'"' => array('SpecialCharacter'),
'!' => array('Image'),
'&' => array('SpecialCharacter'),
'*' => array('Emphasis'),
':' => array('Url'),
'<' => array('UrlTag', 'EmailTag', 'Markup', 'SpecialCharacter'),
'>' => array('SpecialCharacter'),
'[' => array('Link'),
'_' => array('Emphasis'),
'`' => array('Code'),
'~' => array('Strikethrough'),
'\\' => array('EscapeSequence'),
);
# ~
protected $inlineMarkerList = '!"*_&[:<>`~\\';
#
# ~
#
public function line($text)
{
$markup = '';
# $excerpt is based on the first occurrence of a marker
while ($excerpt = strpbrk($text, $this->inlineMarkerList))
{
$marker = $excerpt[0];
$markerPosition = strpos($text, $marker);
$Excerpt = array('text' => $excerpt, 'context' => $text);
foreach ($this->InlineTypes[$marker] as $inlineType)
{
$Inline = $this->{'inline'.$inlineType}($Excerpt);
if ( ! isset($Inline))
{
continue;
}
# makes sure that the inline belongs to "our" marker
if (isset($Inline['position']) and $Inline['position'] > $markerPosition)
{
continue;
}
# sets a default inline position
if ( ! isset($Inline['position']))
{
$Inline['position'] = $markerPosition;
}
# the text that comes before the inline
$unmarkedText = substr($text, 0, $Inline['position']);
# compile the unmarked text
$markup .= $this->unmarkedText($unmarkedText);
# compile the inline
$markup .= isset($Inline['markup']) ? $Inline['markup'] : $this->element($Inline['element']);
# remove the examined text
$text = substr($text, $Inline['position'] + $Inline['extent']);
continue 2;
}
# the marker does not belong to an inline
$unmarkedText = substr($text, 0, $markerPosition + 1);
$markup .= $this->unmarkedText($unmarkedText);
$text = substr($text, $markerPosition + 1);
}
$markup .= $this->unmarkedText($text);
return $markup;
}
#
# ~
#
protected function inlineCode($Excerpt)
{
$marker = $Excerpt['text'][0];
if (preg_match('/^('.$marker.'+)[ ]*(.+?)[ ]*(?<!'.$marker.')\1(?!'.$marker.')/s', $Excerpt['text'], $matches))
{
$text = $matches[2];
$text = htmlspecialchars($text, ENT_NOQUOTES, 'UTF-8');
$text = preg_replace("/[ ]*\n/", ' ', $text);
return array(
'extent' => strlen($matches[0]),
'element' => array(
'name' => 'code',
'text' => $text,
),
);
}
}
protected function inlineEmailTag($Excerpt)
{
if (strpos($Excerpt['text'], '>') !== false and preg_match('/^<((mailto:)?\S+?@\S+?)>/i', $Excerpt['text'], $matches))
{
$url = $matches[1];
if ( ! isset($matches[2]))
{
$url = 'mailto:' . $url;
}
return array(
'extent' => strlen($matches[0]),
'element' => array(
'name' => 'a',
'text' => $matches[1],
'attributes' => array(
'href' => $url,
),
),
);
}
}
protected function inlineEmphasis($Excerpt)
{
if ( ! isset($Excerpt['text'][1]))
{
return;
}
$marker = $Excerpt['text'][0];
if ($Excerpt['text'][1] === $marker and preg_match($this->StrongRegex[$marker], $Excerpt['text'], $matches))
{
$emphasis = 'strong';
}
elseif (preg_match($this->EmRegex[$marker], $Excerpt['text'], $matches))
{
$emphasis = 'em';
}
else
{
return;
}
return array(
'extent' => strlen($matches[0]),
'element' => array(
'name' => $emphasis,
'handler' => 'line',
'text' => $matches[1],
),
);
}
protected function inlineEscapeSequence($Excerpt)
{
if (isset($Excerpt['text'][1]) and in_array($Excerpt['text'][1], $this->specialCharacters))
{
return array(
'markup' => $Excerpt['text'][1],
'extent' => 2,
);
}
}
protected function inlineImage($Excerpt)
{
if ( ! isset($Excerpt['text'][1]) or $Excerpt['text'][1] !== '[')
{
return;
}
$Excerpt['text']= substr($Excerpt['text'], 1);
$Link = $this->inlineLink($Excerpt);
if ($Link === null)
{
return;
}
$Inline = array(
'extent' => $Link['extent'] + 1,
'element' => array(
'name' => 'img',
'attributes' => array(
'src' => $Link['element']['attributes']['href'],
'alt' => $Link['element']['text'],
),
),
);
$Inline['element']['attributes'] += $Link['element']['attributes'];
unset($Inline['element']['attributes']['href']);
return $Inline;
}
protected function inlineLink($Excerpt)
{
$Element = array(
'name' => 'a',
'handler' => 'line',
'text' => null,
'attributes' => array(
'href' => null,
'title' => null,
),
);
$extent = 0;
$remainder = $Excerpt['text'];
if (preg_match('/\[((?:[^][]++|(?R))*+)\]/', $remainder, $matches))
{
$Element['text'] = $matches[1];
$extent += strlen($matches[0]);
$remainder = substr($remainder, $extent);
}
else
{
return;
}
if (preg_match('/^[(]\s*+((?:[^ ()]++|[(][^ )]+[)])++)(?:[ ]+("[^"]*"|\'[^\']*\'))?\s*[)]/', $remainder, $matches))
{
$Element['attributes']['href'] = $matches[1];
if (isset($matches[2]))
{
$Element['attributes']['title'] = substr($matches[2], 1, - 1);
}
$extent += strlen($matches[0]);
}
else
{
if (preg_match('/^\s*\[(.*?)\]/', $remainder, $matches))
{
$definition = strlen($matches[1]) ? $matches[1] : $Element['text'];
$definition = strtolower($definition);
$extent += strlen($matches[0]);
}
else
{
$definition = strtolower($Element['text']);
}
if ( ! isset($this->DefinitionData['Reference'][$definition]))
{
return;
}
$Definition = $this->DefinitionData['Reference'][$definition];
$Element['attributes']['href'] = $Definition['url'];
$Element['attributes']['title'] = $Definition['title'];
}
$Element['attributes']['href'] = str_replace(array('&', '<'), array('&', '<'), $Element['attributes']['href']);
return array(
'extent' => $extent,
'element' => $Element,
);
}
protected function inlineMarkup($Excerpt)
{
if ($this->markupEscaped or strpos($Excerpt['text'], '>') === false)
{
return;
}
if ($Excerpt['text'][1] === '/' and preg_match('/^<\/\w[\w-]*[ ]*>/s', $Excerpt['text'], $matches))
{
return array(
'markup' => $matches[0],
'extent' => strlen($matches[0]),
);
}
if ($Excerpt['text'][1] === '!' and preg_match('/^<!---?[^>-](?:-?[^-])*-->/s', $Excerpt['text'], $matches))
{
return array(
'markup' => $matches[0],
'extent' => strlen($matches[0]),
);
}
if ($Excerpt['text'][1] !== ' ' and preg_match('/^<\w[\w-]*(?:[ ]*'.$this->regexHtmlAttribute.')*[ ]*\/?>/s', $Excerpt['text'], $matches))
{
return array(
'markup' => $matches[0],
'extent' => strlen($matches[0]),
);
}
}
protected function inlineSpecialCharacter($Excerpt)
{