mirror of
https://github.com/erusev/parsedown.git
synced 2023-08-10 21:13:06 +03:00
804 lines
15 KiB
PHP
Executable File
804 lines
15 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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# 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], $text);
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}
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$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[$label] = trim($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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# 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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$text = preg_replace('/[ ]{2}\n/', '<br />'."\n", $text);
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if ($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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default:
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$markup .= $element['text']."\n";
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}
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}
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return $markup;
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}
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|
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private function parse_span_elements($text)
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{
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$map = array();
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$index = 0;
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|
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# code span
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|
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if (strpos($text, '`') !== FALSE and preg_match_all('/`(.+?)`/', $text, $matches, PREG_SET_ORDER))
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{
|
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foreach ($matches as $matches)
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{
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$element_text = $matches[1];
|
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$element_text = htmlspecialchars($element_text, ENT_NOQUOTES, 'UTF-8');
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|
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# decodes escape sequences
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$this->escape_sequence_map
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and strpos($element_text, "\x1A") !== FALSE
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and $element_text = strtr($element_text, $this->escape_sequence_map);
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# composes element
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$element = '<code>'.$element_text.'</code>';
|
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# encodes element
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$code = "\x1A".'$'.$index;
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$text = str_replace($matches[0], $code, $text);
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|
|
$map[$code] = $element;
|
|
|
|
$index ++;
|
|
}
|
|
}
|
|
|
|
# inline link or image
|
|
|
|
if (strpos($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;
|
|
|
|
$index ++;
|
|
}
|
|
}
|
|
|
|
# reference link or image
|
|
|
|
if ($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;
|
|
|
|
$index ++;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (strpos($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;
|
|
}
|
|
}
|