mirror of
https://github.com/erusev/parsedown.git
synced 2023-08-10 21:13:06 +03:00
991 lines
19 KiB
PHP
Executable File
991 lines
19 KiB
PHP
Executable File
<?php
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#
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#
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# Parsedown
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# http://parsedown.org
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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, please view the LICENSE file that was
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# distributed with this source code.
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#
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#
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class Parsedown
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{
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#
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# Multiton (http://en.wikipedia.org/wiki/Multiton_pattern)
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#
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static function instance($name = 'default')
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{
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if (isset(self::$instances[$name]))
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return self::$instances[$name];
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$instance = new Parsedown();
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self::$instances[$name] = $instance;
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return $instance;
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}
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private static $instances = array();
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#
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# Setters
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#
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private $break_marker = " \n";
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function set_breaks_enabled($breaks_enabled)
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{
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$this->break_marker = $breaks_enabled ? "\n" : " \n";
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return $this;
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}
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#
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# Fields
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#
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private $reference_map = array();
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private $escape_sequence_map = array();
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#
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# Public Methods
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#
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function parse($text)
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{
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# removes UTF-8 BOM and marker characters
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$text = preg_replace('{^\xEF\xBB\xBF|\x1A}', '', $text);
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# removes \r characters
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$text = str_replace("\r\n", "\n", $text);
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$text = str_replace("\r", "\n", $text);
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# replaces tabs with spaces
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$text = str_replace("\t", ' ', $text);
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# encodes escape sequences
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if (strpos($text, '\\') !== FALSE)
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{
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$escape_sequences = array('\\\\', '\`', '\*', '\_', '\{', '\}', '\[', '\]', '\(', '\)', '\>', '\#', '\+', '\-', '\.', '\!');
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foreach ($escape_sequences as $index => $escape_sequence)
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{
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if (strpos($text, $escape_sequence) !== FALSE)
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{
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$code = "\x1A".'\\'.$index.';';
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$text = str_replace($escape_sequence, $code, $text);
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$this->escape_sequence_map[$code] = $escape_sequence;
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}
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}
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}
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# ~
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$text = preg_replace('/\n\s*\n/', "\n\n", $text);
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$text = trim($text, "\n");
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$lines = explode("\n", $text);
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$text = $this->parse_block_elements($lines);
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# decodes escape sequences
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foreach ($this->escape_sequence_map as $code => $escape_sequence)
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{
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$text = str_replace($code, $escape_sequence[1], $text);
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}
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# ~
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$text = rtrim($text, "\n");
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return $text;
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}
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#
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# Private Methods
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#
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private function parse_block_elements(array $lines, $context = '')
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{
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$elements = array();
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$element = array(
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'type' => '',
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);
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foreach ($lines as $line)
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{
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# fenced elements
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switch ($element['type'])
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{
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case 'fenced_code_block':
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if ( ! isset($element['closed']))
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{
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if (preg_match('/^[ ]*'.$element['fence'][0].'{3,}[ ]*$/', $line))
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{
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$element['closed'] = true;
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}
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else
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{
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$element['text'] !== '' and $element['text'] .= "\n";
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$element['text'] .= $line;
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}
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continue 2;
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}
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break;
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case 'markup':
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if ( ! isset($element['closed']))
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{
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if (preg_match('{<'.$element['subtype'].'>$}', $line)) # opening tag
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{
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$element['depth']++;
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}
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if (preg_match('{</'.$element['subtype'].'>$}', $line)) # closing tag
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{
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$element['depth'] > 0
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? $element['depth']--
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: $element['closed'] = true;
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}
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$element['text'] .= "\n".$line;
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continue 2;
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}
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break;
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}
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# *
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if ($line === '')
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{
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$element['interrupted'] = true;
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continue;
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}
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# composite elements
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switch ($element['type'])
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{
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case 'blockquote':
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if ( ! isset($element['interrupted']))
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{
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$line = preg_replace('/^[ ]*>[ ]?/', '', $line);
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$element['lines'] []= $line;
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continue 2;
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}
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break;
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case 'li':
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if (preg_match('/^([ ]{0,3})(\d+[.]|[*+-])[ ](.*)/', $line, $matches))
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{
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if ($element['indentation'] !== $matches[1])
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{
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$element['lines'] []= $line;
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}
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else
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{
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unset($element['last']);
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$elements []= $element;
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$element = array(
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'type' => 'li',
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'indentation' => $matches[1],
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'last' => true,
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'lines' => array(
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preg_replace('/^[ ]{0,4}/', '', $matches[3]),
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),
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);
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}
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continue 2;
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}
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if (isset($element['interrupted']))
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{
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if ($line[0] === ' ')
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{
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$element['lines'] []= '';
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$line = preg_replace('/^[ ]{0,4}/', '', $line);
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$element['lines'] []= $line;
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unset($element['interrupted']);
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continue 2;
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}
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}
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else
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{
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$line = preg_replace('/^[ ]{0,4}/', '', $line);
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$element['lines'] []= $line;
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continue 2;
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}
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break;
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}
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# indentation sensitive types
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$deindented_line = $line;
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switch ($line[0])
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{
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case ' ':
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# ~
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$deindented_line = ltrim($line);
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if ($deindented_line === '')
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{
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continue 2;
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}
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# code block
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if (preg_match('/^[ ]{4}(.*)/', $line, $matches))
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{
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if ($element['type'] === 'code_block')
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{
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if (isset($element['interrupted']))
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{
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$element['text'] .= "\n";
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unset ($element['interrupted']);
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}
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$element['text'] .= "\n".$matches[1];
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}
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else
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{
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$elements []= $element;
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$element = array(
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'type' => 'code_block',
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'text' => $matches[1],
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);
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}
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continue 2;
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}
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break;
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case '#':
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# atx heading (#)
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if (preg_match('/^(#{1,6})[ ]*(.+?)[ ]*#*$/', $line, $matches))
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{
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$elements []= $element;
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$level = strlen($matches[1]);
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$element = array(
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'type' => 'h.',
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'text' => $matches[2],
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'level' => $level,
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);
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continue 2;
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}
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break;
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case '-':
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# setext heading (---)
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if ($line[0] === '-' and $element['type'] === 'p' and ! isset($element['interrupted']) and preg_match('/^[-]+[ ]*$/', $line))
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{
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$element['type'] = 'h.';
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$element['level'] = 2;
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continue 2;
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}
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break;
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case '=':
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# setext heading (===)
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if ($line[0] === '=' and $element['type'] === 'p' and ! isset($element['interrupted']) and preg_match('/^[=]+[ ]*$/', $line))
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{
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$element['type'] = 'h.';
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$element['level'] = 1;
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continue 2;
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}
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break;
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}
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# indentation insensitive types
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switch ($deindented_line[0])
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{
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case '<':
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# self-closing tag
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if (preg_match('{^<.+?/>$}', $deindented_line))
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{
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$elements []= $element;
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$element = array(
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'type' => '',
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'text' => $deindented_line,
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);
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continue 2;
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}
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# opening tag
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if (preg_match('{^<(\w+)(?:[ ].*?)?>}', $deindented_line, $matches))
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{
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$elements []= $element;
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$element = array(
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'type' => 'markup',
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'subtype' => strtolower($matches[1]),
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'text' => $deindented_line,
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'depth' => 0,
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);
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preg_match('{</'.$matches[1].'>\s*$}', $deindented_line) and $element['closed'] = true;
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continue 2;
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}
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break;
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case '>':
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# quote
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if (preg_match('/^>[ ]?(.*)/', $deindented_line, $matches))
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{
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$elements []= $element;
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$element = array(
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'type' => 'blockquote',
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'lines' => array(
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$matches[1],
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),
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);
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continue 2;
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}
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break;
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case '[':
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# reference
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if (preg_match('/^\[(.+?)\]:[ ]*(.+?)(?:[ ]+[\'"](.+?)[\'"])?[ ]*$/', $deindented_line, $matches))
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{
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$label = strtolower($matches[1]);
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$this->reference_map[$label] = array(
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'»' => trim($matches[2], '<>'),
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);
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if (isset($matches[3]))
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{
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$this->reference_map[$label]['#'] = $matches[3];
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}
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continue 2;
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}
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break;
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case '`':
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case '~':
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# fenced code block
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if (preg_match('/^([`]{3,}|[~]{3,})[ ]*(\S+)?[ ]*$/', $deindented_line, $matches))
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{
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$elements []= $element;
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$element = array(
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'type' => 'fenced_code_block',
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'text' => '',
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'fence' => $matches[1],
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);
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isset($matches[2]) and $element['language'] = $matches[2];
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continue 2;
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}
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break;
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case '*':
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case '+':
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case '-':
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case '_':
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# hr
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if (preg_match('/^([-*_])([ ]{0,2}\1){2,}[ ]*$/', $deindented_line))
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{
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$elements []= $element;
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$element = array(
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'type' => 'hr',
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);
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continue 2;
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}
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# li
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if (preg_match('/^([ ]*)[*+-][ ](.*)/', $line, $matches))
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{
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$elements []= $element;
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$element = array(
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'type' => 'li',
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'ordered' => false,
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'indentation' => $matches[1],
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'last' => true,
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'lines' => array(
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preg_replace('/^[ ]{0,4}/', '', $matches[2]),
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),
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);
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continue 2;
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}
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}
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# li
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if ($deindented_line[0] <= '9' and $deindented_line >= '0' and preg_match('/^([ ]*)\d+[.][ ](.*)/', $line, $matches))
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{
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$elements []= $element;
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$element = array(
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'type' => 'li',
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'ordered' => true,
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'indentation' => $matches[1],
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'last' => true,
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'lines' => array(
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preg_replace('/^[ ]{0,4}/', '', $matches[2]),
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),
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);
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continue;
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}
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# paragraph
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if ($element['type'] === 'p')
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{
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if (isset($element['interrupted']))
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{
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$elements []= $element;
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$element['text'] = $line;
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unset($element['interrupted']);
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}
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else
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{
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$element['text'] .= "\n".$line;
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}
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}
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else
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{
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$elements []= $element;
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$element = array(
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'type' => 'p',
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'text' => $line,
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);
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}
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}
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$elements []= $element;
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unset($elements[0]);
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#
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# ~
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#
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$markup = '';
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foreach ($elements as $element)
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{
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switch ($element['type'])
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{
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case 'p':
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$text = $this->parse_span_elements($element['text']);
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if ($context === 'li' and $markup === '')
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{
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if (isset($element['interrupted']))
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{
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$markup .= "\n".'<p>'.$text.'</p>'."\n";
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}
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else
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{
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$markup .= $text;
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}
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}
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else
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{
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$markup .= '<p>'.$text.'</p>'."\n";
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}
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break;
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case 'blockquote':
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$text = $this->parse_block_elements($element['lines']);
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$markup .= '<blockquote>'."\n".$text.'</blockquote>'."\n";
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break;
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case 'code_block':
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case 'fenced_code_block':
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$text = htmlspecialchars($element['text'], ENT_NOQUOTES, 'UTF-8');
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strpos($text, "\x1A\\") !== FALSE and $text = strtr($text, $this->escape_sequence_map);
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$markup .= isset($element['language'])
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? '<pre><code class="language-'.$element['language'].'">'.$text.'</code></pre>'
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: '<pre><code>'.$text.'</code></pre>';
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$markup .= "\n";
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break;
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case 'h.':
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$text = $this->parse_span_elements($element['text']);
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$markup .= '<h'.$element['level'].'>'.$text.'</h'.$element['level'].'>'."\n";
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break;
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case 'hr':
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$markup .= '<hr />'."\n";
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break;
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case 'li':
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if (isset($element['ordered'])) # first
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{
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$list_type = $element['ordered'] ? 'ol' : 'ul';
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$markup .= '<'.$list_type.'>'."\n";
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}
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if (isset($element['interrupted']) and ! isset($element['last']))
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{
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$element['lines'] []= '';
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}
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$text = $this->parse_block_elements($element['lines'], 'li');
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$markup .= '<li>'.$text.'</li>'."\n";
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isset($element['last']) and $markup .= '</'.$list_type.'>'."\n";
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break;
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case 'markup':
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$markup .= $this->parse_span_elements($element['text'])."\n";
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break;
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default:
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$markup .= $element['text']."\n";
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}
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}
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return $markup;
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}
|
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|
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# ~
|
|
|
|
private $strong_regex = array(
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|
'*' => '/^[*]{2}([^*]+?)[*]{2}(?![*])/s',
|
|
'_' => '/^__([^_]+?)__(?!_)/s',
|
|
);
|
|
|
|
private $em_regex = array(
|
|
'*' => '/^[*]([^*]+?)[*](?![*])/s',
|
|
'_' => '/^_([^_]+?)[_](?![_])\b/s',
|
|
);
|
|
|
|
private $strong_em_regex = array(
|
|
'*' => '/^[*]{2}(.*?)[*](.+?)[*](.*?)[*]{2}/s',
|
|
'_' => '/^__(.*?)_(.+?)_(.*?)__/s',
|
|
);
|
|
|
|
private $em_strong_regex = array(
|
|
'*' => '/^[*](.*?)[*]{2}(.+?)[*]{2}(.*?)[*]/s',
|
|
'_' => '/^_(.*?)__(.+?)__(.*?)_/s',
|
|
);
|
|
|
|
private function parse_span_elements($text, $markers = array('![', '&', '*', '<', '[', '_', '`', 'http', '~~'))
|
|
{
|
|
if (isset($text[2]) === false or $markers === array())
|
|
{
|
|
return $text;
|
|
}
|
|
|
|
# ~
|
|
|
|
$markup = '';
|
|
|
|
while ($markers)
|
|
{
|
|
$closest_marker = null;
|
|
$closest_marker_index = 0;
|
|
$closest_marker_position = null;
|
|
|
|
foreach ($markers as $index => $marker)
|
|
{
|
|
$marker_position = strpos($text, $marker);
|
|
|
|
if ($marker_position === false)
|
|
{
|
|
unset($markers[$index]);
|
|
|
|
continue;
|
|
}
|
|
|
|
if ($closest_marker === null or $marker_position < $closest_marker_position)
|
|
{
|
|
$closest_marker = $marker;
|
|
$closest_marker_index = $index;
|
|
$closest_marker_position = $marker_position;
|
|
}
|
|
}
|
|
|
|
# ~
|
|
|
|
if ($closest_marker === null or isset($text[$closest_marker_position + 2]) === false)
|
|
{
|
|
$markup .= $text;
|
|
|
|
break;
|
|
}
|
|
else
|
|
{
|
|
$markup .= substr($text, 0, $closest_marker_position);
|
|
}
|
|
|
|
$text = substr($text, $closest_marker_position);
|
|
|
|
# ~
|
|
|
|
unset($markers[$closest_marker_index]);
|
|
|
|
# ~
|
|
|
|
switch ($closest_marker)
|
|
{
|
|
case '![':
|
|
case '[':
|
|
|
|
if (strpos($text, ']') and preg_match('/\[((?:[^][]|(?R))*)\]/', $text, $matches))
|
|
{
|
|
$element = array(
|
|
'!' => $text[0] === '!',
|
|
'a' => $matches[1],
|
|
);
|
|
|
|
$offset = strlen($matches[0]);
|
|
|
|
$element['!'] and $offset++;
|
|
|
|
$remaining_text = substr($text, $offset);
|
|
|
|
if ($remaining_text[0] === '(' and preg_match('/\([ ]*(.*?)(?:[ ]+[\'"](.+?)[\'"])?[ ]*\)/', $remaining_text, $matches))
|
|
{
|
|
$element['»'] = $matches[1];
|
|
|
|
if (isset($matches[2]))
|
|
{
|
|
$element['#'] = $matches[2];
|
|
}
|
|
|
|
$offset += strlen($matches[0]);
|
|
}
|
|
elseif ($this->reference_map)
|
|
{
|
|
$reference = $element['a'];
|
|
|
|
if (preg_match('/^\s*\[(.*?)\]/', $remaining_text, $matches))
|
|
{
|
|
$reference = $matches[1] ? $matches[1] : $element['a'];
|
|
|
|
$offset += strlen($matches[0]);
|
|
}
|
|
|
|
$reference = strtolower($reference);
|
|
|
|
if (isset($this->reference_map[$reference]))
|
|
{
|
|
$element['»'] = $this->reference_map[$reference]['»'];
|
|
|
|
if (isset($this->reference_map[$reference]['#']))
|
|
{
|
|
$element['#'] = $this->reference_map[$reference]['#'];
|
|
}
|
|
}
|
|
else
|
|
{
|
|
unset($element);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
unset($element);
|
|
}
|
|
}
|
|
|
|
if (isset($element))
|
|
{
|
|
$element['»'] = str_replace('&', '&', $element['»']);
|
|
$element['»'] = str_replace('<', '<', $element['»']);
|
|
|
|
if ($element['!'])
|
|
{
|
|
$markup .= '<img alt="'.$element['a'].'" src="'.$element['»'].'" />';
|
|
}
|
|
else
|
|
{
|
|
$element['a'] = $this->parse_span_elements($element['a'], $markers);
|
|
|
|
$markup .= isset($element['#'])
|
|
? '<a href="'.$element['»'].'" title="'.$element['#'].'">'.$element['a'].'</a>'
|
|
: '<a href="'.$element['»'].'">'.$element['a'].'</a>';
|
|
}
|
|
|
|
unset($element);
|
|
}
|
|
else
|
|
{
|
|
$markup .= $closest_marker;
|
|
|
|
$offset = $closest_marker === '![' ? 2 : 1;
|
|
}
|
|
|
|
break;
|
|
|
|
case '&':
|
|
|
|
$markup .= '&';
|
|
|
|
$offset = substr($text, 0, 5) === '&' ? 5 : 1;
|
|
|
|
break;
|
|
|
|
case '*':
|
|
case '_':
|
|
|
|
if ($text[1] === $closest_marker and preg_match($this->strong_regex[$closest_marker], $text, $matches))
|
|
{
|
|
$matches[1] = $this->parse_span_elements($matches[1], $markers);
|
|
|
|
$markup .= '<strong>'.$matches[1].'</strong>';
|
|
}
|
|
elseif (preg_match($this->em_regex[$closest_marker], $text, $matches))
|
|
{
|
|
$matches[1] = $this->parse_span_elements($matches[1], $markers);
|
|
|
|
$markup .= '<em>'.$matches[1].'</em>';
|
|
}
|
|
elseif ($text[1] === $closest_marker and preg_match($this->strong_em_regex[$closest_marker], $text, $matches))
|
|
{
|
|
$matches[2] = $this->parse_span_elements($matches[2], $markers);
|
|
|
|
$matches[1] and $matches[1] = $this->parse_span_elements($matches[1], $markers);
|
|
$matches[3] and $matches[3] = $this->parse_span_elements($matches[3], $markers);
|
|
|
|
$markup .= '<strong>'.$matches[1].'<em>'.$matches[2].'</em>'.$matches[3].'</strong>';
|
|
}
|
|
elseif (preg_match($this->em_strong_regex[$closest_marker], $text, $matches))
|
|
{
|
|
$matches[2] = $this->parse_span_elements($matches[2], $markers);
|
|
|
|
$matches[1] and $matches[1] = $this->parse_span_elements($matches[1], $markers);
|
|
$matches[3] and $matches[3] = $this->parse_span_elements($matches[3], $markers);
|
|
|
|
$markup .= '<em>'.$matches[1].'<strong>'.$matches[2].'</strong>'.$matches[3].'</em>';
|
|
}
|
|
|
|
if (isset($matches) and $matches)
|
|
{
|
|
$offset = strlen($matches[0]);
|
|
}
|
|
else
|
|
{
|
|
$markup .= $closest_marker;
|
|
|
|
$offset = 1;
|
|
}
|
|
|
|
break;
|
|
|
|
case '<':
|
|
|
|
if (strpos($text, '>') !== false)
|
|
{
|
|
if ($text[1] === 'h' and preg_match('/^<(https?:[\/]{2}[^\s]+?)>/i', $text, $matches))
|
|
{
|
|
$element_url = $matches[1];
|
|
$element_url = str_replace('&', '&', $element_url);
|
|
$element_url = str_replace('<', '<', $element_url);
|
|
|
|
$markup .= '<a href="'.$element_url.'">'.$element_url.'</a>';
|
|
|
|
$offset = strlen($matches[0]);
|
|
}
|
|
elseif (preg_match('/^<\/?\w.*?>/', $text, $matches))
|
|
{
|
|
$markup .= $matches[0];
|
|
|
|
$offset = strlen($matches[0]);
|
|
}
|
|
else
|
|
{
|
|
$markup .= '<';
|
|
|
|
$offset = 1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
$markup .= '<';
|
|
|
|
$offset = 1;
|
|
}
|
|
|
|
break;
|
|
|
|
case '`':
|
|
|
|
if (preg_match('/^`(.+?)`/', $text, $matches))
|
|
{
|
|
$element_text = $matches[1];
|
|
$element_text = htmlspecialchars($element_text, ENT_NOQUOTES, 'UTF-8');
|
|
|
|
if ($this->escape_sequence_map and strpos($element_text, "\x1A") !== false)
|
|
{
|
|
$element_text = strtr($element_text, $this->escape_sequence_map);
|
|
}
|
|
|
|
$markup .= '<code>'.$element_text.'</code>';
|
|
|
|
$offset = strlen($matches[0]);
|
|
}
|
|
else
|
|
{
|
|
$markup .= '`';
|
|
|
|
$offset = 1;
|
|
}
|
|
|
|
break;
|
|
|
|
case 'http':
|
|
|
|
if (preg_match('/^https?:[\/]{2}[^\s]+\b/i', $text, $matches))
|
|
{
|
|
$element_url = $matches[0];
|
|
$element_url = str_replace('&', '&', $element_url);
|
|
$element_url = str_replace('<', '<', $element_url);
|
|
|
|
$markup .= '<a href="'.$element_url.'">'.$element_url.'</a>';
|
|
|
|
$offset = strlen($matches[0]);
|
|
}
|
|
else
|
|
{
|
|
$markup .= 'http';
|
|
|
|
$offset = 4;
|
|
}
|
|
|
|
break;
|
|
|
|
case '~~':
|
|
|
|
if (preg_match('/^~~(?=\S)(.+?)(?<=\S)~~/', $text, $matches))
|
|
{
|
|
$matches[1] = $this->parse_span_elements($matches[1], $markers);
|
|
|
|
$markup .= '<del>'.$matches[1].'</del>';
|
|
|
|
$offset = strlen($matches[0]);
|
|
}
|
|
else
|
|
{
|
|
$markup .= '~~';
|
|
|
|
$offset = 2;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
if (isset($offset))
|
|
{
|
|
$text = substr($text, $offset);
|
|
}
|
|
|
|
$markers[$closest_marker_index] = $closest_marker;
|
|
}
|
|
|
|
$markup = str_replace($this->break_marker, '<br />'."\n", $markup);
|
|
|
|
return $markup;
|
|
}
|
|
} |