mirror of
https://github.com/erusev/parsedown.git
synced 2023-08-10 21:13:06 +03:00
806 lines
15 KiB
PHP
Executable File
806 lines
15 KiB
PHP
Executable File
<?php
|
|
|
|
#
|
|
#
|
|
# Parsedown
|
|
# http://parsedown.org
|
|
#
|
|
# (c) Emanuil Rusev
|
|
# http://erusev.com
|
|
#
|
|
# For the full license information, please view the LICENSE file that was
|
|
# distributed with this source code.
|
|
#
|
|
#
|
|
|
|
class Parsedown
|
|
{
|
|
#
|
|
# Multiton (http://en.wikipedia.org/wiki/Multiton_pattern)
|
|
#
|
|
|
|
static function instance($name = 'default')
|
|
{
|
|
if (isset(self::$instances[$name]))
|
|
return self::$instances[$name];
|
|
|
|
$instance = new Parsedown();
|
|
|
|
self::$instances[$name] = $instance;
|
|
|
|
return $instance;
|
|
}
|
|
|
|
private static $instances = array();
|
|
|
|
#
|
|
# Fields
|
|
#
|
|
|
|
private $reference_map = array();
|
|
private $escape_sequence_map = array();
|
|
|
|
#
|
|
# Public Methods
|
|
#
|
|
|
|
function parse($text)
|
|
{
|
|
# removes UTF-8 BOM and marker characters
|
|
$text = preg_replace('{^\xEF\xBB\xBF|\x1A}', '', $text);
|
|
|
|
# removes \r characters
|
|
$text = str_replace("\r\n", "\n", $text);
|
|
$text = str_replace("\r", "\n", $text);
|
|
|
|
# replaces tabs with spaces
|
|
$text = str_replace("\t", ' ', $text);
|
|
|
|
# encodes escape sequences
|
|
|
|
if (strpos($text, '\\') !== FALSE)
|
|
{
|
|
$escape_sequences = array('\\\\', '\`', '\*', '\_', '\{', '\}', '\[', '\]', '\(', '\)', '\>', '\#', '\+', '\-', '\.', '\!');
|
|
|
|
foreach ($escape_sequences as $index => $escape_sequence)
|
|
{
|
|
if (strpos($text, $escape_sequence) !== FALSE)
|
|
{
|
|
$code = "\x1A".'\\'.$index.';';
|
|
|
|
$text = str_replace($escape_sequence, $code, $text);
|
|
|
|
$this->escape_sequence_map[$code] = $escape_sequence;
|
|
}
|
|
}
|
|
}
|
|
|
|
# ~
|
|
|
|
$text = preg_replace('/\n\s*\n/', "\n\n", $text);
|
|
$text = trim($text, "\n");
|
|
|
|
$lines = explode("\n", $text);
|
|
|
|
$text = $this->parse_block_elements($lines);
|
|
|
|
# decodes escape sequences
|
|
|
|
foreach ($this->escape_sequence_map as $code => $escape_sequence)
|
|
{
|
|
$text = str_replace($code, $escape_sequence[1], $text);
|
|
}
|
|
|
|
$text = rtrim($text, "\n");
|
|
|
|
return $text;
|
|
}
|
|
|
|
#
|
|
# Private Methods
|
|
#
|
|
|
|
private function parse_block_elements(array $lines, $context = '')
|
|
{
|
|
$elements = array();
|
|
|
|
$element = array(
|
|
'type' => '',
|
|
);
|
|
|
|
foreach ($lines as $line)
|
|
{
|
|
# fenced elements
|
|
|
|
switch ($element['type'])
|
|
{
|
|
case 'fenced_code_block':
|
|
|
|
if ( ! isset($element['closed']))
|
|
{
|
|
if (preg_match('/^[ ]*'.$element['fence'][0].'{3,}[ ]*$/', $line))
|
|
{
|
|
$element['closed'] = true;
|
|
}
|
|
else
|
|
{
|
|
$element['text'] !== '' and $element['text'] .= "\n";
|
|
|
|
$element['text'] .= $line;
|
|
}
|
|
|
|
continue 2;
|
|
}
|
|
|
|
break;
|
|
|
|
case 'markup':
|
|
|
|
if ( ! isset($element['closed']))
|
|
{
|
|
if (preg_match('{<'.$element['subtype'].'>$}', $line)) # opening tag
|
|
{
|
|
$element['depth']++;
|
|
}
|
|
|
|
if (preg_match('{</'.$element['subtype'].'>$}', $line)) # closing tag
|
|
{
|
|
$element['depth'] > 0
|
|
? $element['depth']--
|
|
: $element['closed'] = true;
|
|
}
|
|
|
|
$element['text'] .= "\n".$line;
|
|
|
|
continue 2;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
# *
|
|
|
|
if ($line === '')
|
|
{
|
|
$element['interrupted'] = true;
|
|
|
|
continue;
|
|
}
|
|
|
|
# composite elements
|
|
|
|
switch ($element['type'])
|
|
{
|
|
case 'blockquote':
|
|
|
|
if ( ! isset($element['interrupted']))
|
|
{
|
|
$line = preg_replace('/^[ ]*>[ ]?/', '', $line);
|
|
|
|
$element['lines'] []= $line;
|
|
|
|
continue 2;
|
|
}
|
|
|
|
break;
|
|
|
|
case 'li':
|
|
|
|
if (preg_match('/^([ ]{0,3})(\d+[.]|[*+-])[ ](.*)/', $line, $matches))
|
|
{
|
|
if ($element['indentation'] !== $matches[1])
|
|
{
|
|
$element['lines'] []= $line;
|
|
}
|
|
else
|
|
{
|
|
unset($element['last']);
|
|
|
|
$elements []= $element;
|
|
|
|
$element = array(
|
|
'type' => 'li',
|
|
'indentation' => $matches[1],
|
|
'last' => true,
|
|
'lines' => array(
|
|
preg_replace('/^[ ]{0,4}/', '', $matches[3]),
|
|
),
|
|
);
|
|
}
|
|
|
|
continue 2;
|
|
}
|
|
|
|
if (isset($element['interrupted']))
|
|
{
|
|
if ($line[0] === ' ')
|
|
{
|
|
$element['lines'] []= '';
|
|
|
|
$line = preg_replace('/^[ ]{0,4}/', '', $line);
|
|
|
|
$element['lines'] []= $line;
|
|
|
|
unset($element['interrupted']);
|
|
|
|
continue 2;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
$line = preg_replace('/^[ ]{0,4}/', '', $line);
|
|
|
|
$element['lines'] []= $line;
|
|
|
|
continue 2;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
# indentation sensitive types
|
|
|
|
$deindented_line = $line;
|
|
|
|
switch ($line[0])
|
|
{
|
|
case ' ':
|
|
|
|
# ~
|
|
|
|
$deindented_line = ltrim($line);
|
|
|
|
if ($deindented_line === '')
|
|
{
|
|
continue 2;
|
|
}
|
|
|
|
# code block
|
|
|
|
if (preg_match('/^[ ]{4}(.*)/', $line, $matches))
|
|
{
|
|
if ($element['type'] === 'code_block')
|
|
{
|
|
if (isset($element['interrupted']))
|
|
{
|
|
$element['text'] .= "\n";
|
|
|
|
unset ($element['interrupted']);
|
|
}
|
|
|
|
$element['text'] .= "\n".$matches[1];
|
|
}
|
|
else
|
|
{
|
|
$elements []= $element;
|
|
|
|
$element = array(
|
|
'type' => 'code_block',
|
|
'text' => $matches[1],
|
|
);
|
|
}
|
|
|
|
continue 2;
|
|
}
|
|
|
|
break;
|
|
|
|
case '#':
|
|
|
|
# atx heading (#)
|
|
|
|
if (preg_match('/^(#{1,6})[ ]*(.+?)[ ]*#*$/', $line, $matches))
|
|
{
|
|
$elements []= $element;
|
|
|
|
$level = strlen($matches[1]);
|
|
|
|
$element = array(
|
|
'type' => 'h.',
|
|
'text' => $matches[2],
|
|
'level' => $level,
|
|
);
|
|
|
|
continue 2;
|
|
}
|
|
|
|
break;
|
|
|
|
case '-':
|
|
|
|
# setext heading (---)
|
|
|
|
if ($line[0] === '-' and $element['type'] === 'p' and ! isset($element['interrupted']) and preg_match('/^[-]+[ ]*$/', $line))
|
|
{
|
|
$element['type'] = 'h.';
|
|
$element['level'] = 2;
|
|
|
|
continue 2;
|
|
}
|
|
|
|
break;
|
|
|
|
case '=':
|
|
|
|
# setext heading (===)
|
|
|
|
if ($line[0] === '=' and $element['type'] === 'p' and ! isset($element['interrupted']) and preg_match('/^[=]+[ ]*$/', $line))
|
|
{
|
|
$element['type'] = 'h.';
|
|
$element['level'] = 1;
|
|
|
|
continue 2;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
# indentation insensitive types
|
|
|
|
switch ($deindented_line[0])
|
|
{
|
|
case '<':
|
|
|
|
# self-closing tag
|
|
|
|
if (preg_match('{^<.+?/>$}', $deindented_line))
|
|
{
|
|
$elements []= $element;
|
|
|
|
$element = array(
|
|
'type' => '',
|
|
'text' => $deindented_line,
|
|
);
|
|
|
|
continue 2;
|
|
}
|
|
|
|
# opening tag
|
|
|
|
if (preg_match('{^<(\w+)(?:[ ].*?)?>}', $deindented_line, $matches))
|
|
{
|
|
$elements []= $element;
|
|
|
|
$element = array(
|
|
'type' => 'markup',
|
|
'subtype' => strtolower($matches[1]),
|
|
'text' => $deindented_line,
|
|
'depth' => 0,
|
|
);
|
|
|
|
preg_match('{</'.$matches[1].'>\s*$}', $deindented_line) and $element['closed'] = true;
|
|
|
|
continue 2;
|
|
}
|
|
|
|
break;
|
|
|
|
case '>':
|
|
|
|
# quote
|
|
|
|
if (preg_match('/^>[ ]?(.*)/', $deindented_line, $matches))
|
|
{
|
|
$elements []= $element;
|
|
|
|
$element = array(
|
|
'type' => 'blockquote',
|
|
'lines' => array(
|
|
$matches[1],
|
|
),
|
|
);
|
|
|
|
continue 2;
|
|
}
|
|
|
|
break;
|
|
|
|
case '[':
|
|
|
|
# reference
|
|
|
|
if (preg_match('/^\[(.+?)\]:[ ]*([^ ]+)/', $deindented_line, $matches))
|
|
{
|
|
$label = strtolower($matches[1]);
|
|
|
|
$this->reference_map[$label] = trim($matches[2], '<>');;
|
|
|
|
continue 2;
|
|
}
|
|
|
|
break;
|
|
|
|
case '`':
|
|
case '~':
|
|
|
|
# fenced code block
|
|
|
|
if (preg_match('/^([`]{3,}|[~]{3,})[ ]*(\S+)?[ ]*$/', $deindented_line, $matches))
|
|
{
|
|
$elements []= $element;
|
|
|
|
$element = array(
|
|
'type' => 'fenced_code_block',
|
|
'text' => '',
|
|
'fence' => $matches[1],
|
|
);
|
|
|
|
isset($matches[2]) and $element['language'] = $matches[2];
|
|
|
|
continue 2;
|
|
}
|
|
|
|
break;
|
|
|
|
case '*':
|
|
case '+':
|
|
case '-':
|
|
case '_':
|
|
|
|
# hr
|
|
|
|
if (preg_match('/^([-*_])([ ]{0,2}\1){2,}[ ]*$/', $deindented_line))
|
|
{
|
|
$elements []= $element;
|
|
|
|
$element = array(
|
|
'type' => 'hr',
|
|
);
|
|
|
|
continue 2;
|
|
}
|
|
|
|
# li
|
|
|
|
if (preg_match('/^([ ]*)[*+-][ ](.*)/', $line, $matches))
|
|
{
|
|
$elements []= $element;
|
|
|
|
$element = array(
|
|
'type' => 'li',
|
|
'ordered' => false,
|
|
'indentation' => $matches[1],
|
|
'last' => true,
|
|
'lines' => array(
|
|
preg_replace('/^[ ]{0,4}/', '', $matches[2]),
|
|
),
|
|
);
|
|
|
|
continue 2;
|
|
}
|
|
}
|
|
|
|
# li
|
|
|
|
if ($deindented_line[0] <= '9' and $deindented_line >= '0' and preg_match('/^([ ]*)\d+[.][ ](.*)/', $line, $matches))
|
|
{
|
|
$elements []= $element;
|
|
|
|
$element = array(
|
|
'type' => 'li',
|
|
'ordered' => true,
|
|
'indentation' => $matches[1],
|
|
'last' => true,
|
|
'lines' => array(
|
|
preg_replace('/^[ ]{0,4}/', '', $matches[2]),
|
|
),
|
|
);
|
|
|
|
continue;
|
|
}
|
|
|
|
# paragraph
|
|
|
|
if ($element['type'] === 'p')
|
|
{
|
|
if (isset($element['interrupted']))
|
|
{
|
|
$elements []= $element;
|
|
|
|
$element['text'] = $line;
|
|
|
|
unset($element['interrupted']);
|
|
}
|
|
else
|
|
{
|
|
$element['text'] .= "\n".$line;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
$elements []= $element;
|
|
|
|
$element = array(
|
|
'type' => 'p',
|
|
'text' => $line,
|
|
);
|
|
}
|
|
}
|
|
|
|
$elements []= $element;
|
|
|
|
unset($elements[0]);
|
|
|
|
#
|
|
# ~
|
|
#
|
|
|
|
$markup = '';
|
|
|
|
foreach ($elements as $element)
|
|
{
|
|
switch ($element['type'])
|
|
{
|
|
case 'p':
|
|
|
|
$text = $this->parse_span_elements($element['text']);
|
|
|
|
$text = preg_replace('/[ ]{2}\n/', '<br />'."\n", $text);
|
|
|
|
if ($context === 'li' and $markup === '')
|
|
{
|
|
if (isset($element['interrupted']))
|
|
{
|
|
$markup .= "\n".'<p>'.$text.'</p>'."\n";
|
|
}
|
|
else
|
|
{
|
|
$markup .= $text;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
$markup .= '<p>'.$text.'</p>'."\n";
|
|
}
|
|
|
|
break;
|
|
|
|
case 'blockquote':
|
|
|
|
$text = $this->parse_block_elements($element['lines']);
|
|
|
|
$markup .= '<blockquote>'."\n".$text.'</blockquote>'."\n";
|
|
|
|
break;
|
|
|
|
case 'code_block':
|
|
case 'fenced_code_block':
|
|
|
|
$text = htmlspecialchars($element['text'], ENT_NOQUOTES, 'UTF-8');
|
|
|
|
strpos($text, "\x1A\\") !== FALSE and $text = strtr($text, $this->escape_sequence_map);
|
|
|
|
$markup .= isset($element['language'])
|
|
? '<pre><code class="language-'.$element['language'].'">'.$text.'</code></pre>'
|
|
: '<pre><code>'.$text.'</code></pre>';
|
|
|
|
$markup .= "\n";
|
|
|
|
break;
|
|
|
|
case 'h.':
|
|
|
|
$text = $this->parse_span_elements($element['text']);
|
|
|
|
$markup .= '<h'.$element['level'].'>'.$text.'</h'.$element['level'].'>'."\n";
|
|
|
|
break;
|
|
|
|
case 'hr':
|
|
|
|
$markup .= '<hr />'."\n";
|
|
|
|
break;
|
|
|
|
case 'li':
|
|
|
|
if (isset($element['ordered'])) # first
|
|
{
|
|
$list_type = $element['ordered'] ? 'ol' : 'ul';
|
|
|
|
$markup .= '<'.$list_type.'>'."\n";
|
|
}
|
|
|
|
if (isset($element['interrupted']) and ! isset($element['last']))
|
|
{
|
|
$element['lines'] []= '';
|
|
}
|
|
|
|
$text = $this->parse_block_elements($element['lines'], 'li');
|
|
|
|
$markup .= '<li>'.$text.'</li>'."\n";
|
|
|
|
isset($element['last']) and $markup .= '</'.$list_type.'>'."\n";
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
$markup .= $element['text']."\n";
|
|
}
|
|
}
|
|
|
|
return $markup;
|
|
}
|
|
|
|
private function parse_span_elements($text)
|
|
{
|
|
$map = array();
|
|
|
|
$index = 0;
|
|
|
|
# inline link or image (recursive)
|
|
|
|
if (strpos($text, '](') !== FALSE and preg_match_all('/(!?)(\[((?:[^\[\]]|(?2))*)\])\((.*?)\)/', $text, $matches, PREG_SET_ORDER)) # inline
|
|
{
|
|
foreach ($matches as $matches)
|
|
{
|
|
$url = $matches[4];
|
|
|
|
strpos($url, '&') !== FALSE and $url = preg_replace('/&(?!#?\w+;)/', '&', $url);
|
|
|
|
if ($matches[1]) # image
|
|
{
|
|
$element = '<img alt="'.$matches[3].'" src="'.$url.'">';
|
|
}
|
|
else
|
|
{
|
|
$element_text = $this->parse_span_elements($matches[3]);
|
|
|
|
$element = '<a href="'.$url.'">'.$element_text.'</a>';
|
|
}
|
|
|
|
# ~
|
|
|
|
$code = "\x1A".'$'.$index;
|
|
|
|
$text = str_replace($matches[0], $code, $text);
|
|
|
|
$map[$code] = $element;
|
|
|
|
$index ++;
|
|
}
|
|
}
|
|
|
|
# reference link or image (recursive)
|
|
|
|
if ($this->reference_map and strpos($text, '[') !== FALSE and preg_match_all('/(!?)\[(.+?)\](?:\n?[ ]?\[(.*?)\])?/ms', $text, $matches, PREG_SET_ORDER))
|
|
{
|
|
foreach ($matches as $matches)
|
|
{
|
|
$link_definition = isset($matches[3]) && $matches[3]
|
|
? $matches[3]
|
|
: $matches[2]; # implicit
|
|
|
|
$link_definition = strtolower($link_definition);
|
|
|
|
if (isset($this->reference_map[$link_definition]))
|
|
{
|
|
$url = $this->reference_map[$link_definition];
|
|
|
|
strpos($url, '&') !== FALSE and $url = preg_replace('/&(?!#?\w+;)/', '&', $url);
|
|
|
|
if ($matches[1]) # image
|
|
{
|
|
$element = '<img alt="'.$matches[2].'" src="'.$url.'">';
|
|
}
|
|
else # anchor
|
|
{
|
|
$element_text = $this->parse_span_elements($matches[2]);
|
|
|
|
$element = '<a href="'.$url.'">'.$element_text.'</a>';
|
|
}
|
|
|
|
# ~
|
|
|
|
$code = "\x1A".'$'.$index;
|
|
|
|
$text = str_replace($matches[0], $code, $text);
|
|
|
|
$map[$code] = $element;
|
|
|
|
$index ++;
|
|
}
|
|
}
|
|
}
|
|
|
|
# code span
|
|
|
|
if (strpos($text, '`') !== FALSE and preg_match_all('/`(.+?)`/', $text, $matches, PREG_SET_ORDER))
|
|
{
|
|
foreach ($matches as $matches)
|
|
{
|
|
$element_text = $matches[1];
|
|
$element_text = htmlspecialchars($element_text, ENT_NOQUOTES, 'UTF-8');
|
|
|
|
# decodes escape sequences
|
|
|
|
$this->escape_sequence_map
|
|
and strpos($element_text, "\x1A") !== FALSE
|
|
and $element_text = strtr($element_text, $this->escape_sequence_map);
|
|
|
|
# composes element
|
|
|
|
$element = '<code>'.$element_text.'</code>';
|
|
|
|
# encodes element
|
|
|
|
$code = "\x1A".'$'.$index;
|
|
|
|
$text = str_replace($matches[0], $code, $text);
|
|
|
|
$map[$code] = $element;
|
|
|
|
$index ++;
|
|
}
|
|
}
|
|
|
|
# automatic link
|
|
|
|
if (strpos($text, '://') !== FALSE)
|
|
{
|
|
switch (TRUE)
|
|
{
|
|
case preg_match_all('{<(https?:[/]{2}[^\s]+)>}i', $text, $matches, PREG_SET_ORDER):
|
|
case preg_match_all('{\b(https?:[/]{2}[^\s]+)\b}i', $text, $matches, PREG_SET_ORDER):
|
|
|
|
foreach ($matches as $matches)
|
|
{
|
|
$url = $matches[1];
|
|
|
|
strpos($url, '&') !== FALSE and $url = preg_replace('/&(?!#?\w+;)/', '&', $url);
|
|
|
|
$element = '<a href=":href">:text</a>';
|
|
$element = str_replace(':text', $url, $element);
|
|
$element = str_replace(':href', $url, $element);
|
|
|
|
# ~
|
|
|
|
$code = "\x1A".'$'.$index;
|
|
|
|
$text = str_replace($matches[0], $code, $text);
|
|
|
|
$map[$code] = $element;
|
|
|
|
$index ++;
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
# ~
|
|
|
|
strpos($text, '&') !== FALSE and $text = preg_replace('/&(?!#?\w+;)/', '&', $text);
|
|
strpos($text, '<') !== FALSE and $text = preg_replace('/<(?!\/?\w.*?>)/', '<', $text);
|
|
|
|
# ~
|
|
|
|
if (strpos($text, '~~') !== FALSE)
|
|
{
|
|
$text = preg_replace('/~~(?=\S)(.+?)(?<=\S)~~/s', '<del>$1</del>', $text);
|
|
}
|
|
|
|
if (strpos($text, '_') !== FALSE)
|
|
{
|
|
$text = preg_replace('/__(?=\S)([^_]+?)(?<=\S)__/s', '<strong>$1</strong>', $text, -1, $count);
|
|
$count or $text = preg_replace('/__(?=\S)(.+?)(?<=\S)__(?!_)/s', '<strong>$1</strong>', $text);
|
|
|
|
$text = preg_replace('/\b_(?=\S)(.+?)(?<=\S)_\b/s', '<em>$1</em>', $text);
|
|
}
|
|
|
|
if (strpos($text, '*') !== FALSE)
|
|
{
|
|
$text = preg_replace('/\*\*(?=\S)([^*]+?)(?<=\S)\*\*/s', '<strong>$1</strong>', $text, -1, $count);
|
|
$count or $text = preg_replace('/\*\*(?=\S)(.+?)(?<=\S)\*\*(?!\*)/s', '<strong>$1</strong>', $text);
|
|
|
|
$text = preg_replace('/\*(?=\S)([^*]+?)(?<=\S)\*/s', '<em>$1</em>', $text, -1, $count);
|
|
$count or $text = preg_replace('/\*(?=\S)(.+?)(?<=\S)\*(?!\*)/s', '<em>$1</em>', $text);
|
|
}
|
|
|
|
$text = strtr($text, $map);
|
|
|
|
return $text;
|
|
}
|
|
}
|