mirror of
https://github.com/erusev/parsedown.git
synced 2023-08-10 21:13:06 +03:00
1103 lines
31 KiB
PHP
Executable File
1103 lines
31 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, view the LICENSE file that was distributed
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# with this source code.
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#
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#
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class Parsedown
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{
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# Multiton
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static function instance($name = 'default')
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{
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if (isset(self::$instances[$name]))
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{
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return self::$instances[$name];
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}
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$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 $instances = array();
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#
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# Setters
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#
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# Enables GFM line breaks.
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function set_breaks_enabled($breaks_enabled)
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{
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$this->breaks_enabled = $breaks_enabled;
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return $this;
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}
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private $breaks_enabled = false;
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#
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# Synopsis
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#
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# Markdown is intended to be easy-to-read by humans - those of us who read
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# line by line, left to right, top to bottom. In order to take advantage of
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# this, Parsedown tries to read in a similar way. It breaks texts into
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# lines, it iterates through them and it looks at how they start and relate
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# to each other.
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#
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# Methods
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#
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function parse($text)
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{
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# standardize line breaks
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$text = str_replace("\r\n", "\n", $text);
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$text = str_replace("\r", "\n", $text);
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# replace tabs with spaces
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$text = str_replace("\t", ' ', $text);
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# remove surrounding line breaks
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$text = trim($text, "\n");
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# split text into lines
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$lines = explode("\n", $text);
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# convert lines into html
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$text = $this->parse_block_elements($lines);
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# remove trailing line breaks
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$text = chop($text, "\n");
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return $text;
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}
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#
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# Private
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private function parse_block_elements(array $lines, $context = '')
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{
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$blocks = array();
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$block = array(
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'type' => '',
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);
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foreach ($lines as $line)
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{
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# context
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switch ($block['type'])
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{
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case 'fenced':
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if ( ! isset($block['closed']))
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{
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if (preg_match('/^[ ]*'.$block['fence'][0].'{3,}[ ]*$/', $line))
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{
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$block['closed'] = true;
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}
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else
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{
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if ($block['text'] !== '')
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{
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$block['text'] .= "\n";
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}
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$block['text'] .= $line;
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}
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continue 2;
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}
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break;
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case 'markup':
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if ( ! isset($block['closed']))
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{
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if (strpos($line, $block['start']) !== false) # opening tag
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{
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$block['depth']++;
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}
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if (strpos($line, $block['end']) !== false) # closing tag
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{
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if ($block['depth'] > 0)
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{
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$block['depth']--;
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}
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else
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{
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$block['closed'] = true;
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}
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}
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$block['text'] .= "\n".$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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$indentation = 0;
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while(isset($line[$indentation]) and $line[$indentation] === ' ')
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{
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$indentation++;
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}
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$deindented_line = $indentation > 0 ? ltrim($line) : $line;
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# blank
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if ($deindented_line === '')
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{
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$block['interrupted'] = true;
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continue;
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}
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# context
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switch ($block['type'])
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{
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case 'quote':
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if ( ! isset($block['interrupted']))
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{
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$line = preg_replace('/^[ ]*>[ ]?/', '', $line);
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$block['lines'] []= $line;
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continue 2;
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}
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break;
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case 'li':
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if ($block['indentation'] === $indentation and preg_match('/^'.$block['marker'].'[ ](.*)/', $deindented_line, $matches))
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{
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unset($block['last']);
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$blocks []= $block;
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unset($block['first']);
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$block['last'] = true;
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$block['lines'] = array();
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$block['lines'] []= preg_replace('/^[ ]{0,4}/', '', $matches[1]);
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continue 2;
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}
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if ( ! isset($block['interrupted']))
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{
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$line = preg_replace('/^[ ]{0,4}/', '', $line);
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$block['lines'] []= $line;
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continue 2;
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}
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elseif ($line[0] === ' ')
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{
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$block['lines'] []= '';
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$line = preg_replace('/^[ ]{0,4}/', '', $line);
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$block['lines'] []= $line;
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unset($block['interrupted']);
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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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switch ($line[0])
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{
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case ' ':
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# code
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if ($indentation >= 4)
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{
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$code_line = substr($line, 4);
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if ($block['type'] === 'code')
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{
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if (isset($block['interrupted']))
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{
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$block['text'] .= "\n";
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unset($block['interrupted']);
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}
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$block['text'] .= "\n".$code_line;
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}
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else
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{
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$blocks []= $block;
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$block = array(
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'type' => 'code',
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'text' => $code_line,
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);
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}
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continue 2;
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}
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break;
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case '#':
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# atx heading (#)
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if (isset($line[1]))
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{
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$blocks []= $block;
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$level = 1;
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while (isset($line[$level]) and $line[$level] === '#')
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{
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$level++;
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}
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$block = array(
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'type' => 'heading',
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'text' => trim($line, '# '),
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'level' => $level,
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);
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continue 2;
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}
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break;
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case '-':
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case '=':
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# setext heading (===)
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if ($block['type'] === 'paragraph' and isset($block['interrupted']) === false)
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{
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$chopped_line = chop($line);
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$i = 1;
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while (isset($chopped_line[$i]))
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{
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if ($chopped_line[$i] !== $line[0])
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{
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break 2;
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}
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$i++;
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}
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$block['type'] = 'heading';
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$block['level'] = $line[0] === '-' ? 2 : 1;
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continue 2;
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}
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break;
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}
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# indentation insensitive types
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switch ($deindented_line[0])
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{
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case '<':
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$position = strpos($deindented_line, '>');
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if ($position > 1)
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{
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$substring = substr($deindented_line, 1, $position - 1);
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$substring = chop($substring);
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if (substr($substring, -1) === '/')
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{
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$is_self_closing = true;
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$substring = substr($substring, 0, -1);
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}
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$position = strpos($substring, ' ');
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if ($position)
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{
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$name = substr($substring, 0, $position);
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}
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else
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{
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$name = $substring;
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}
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if ( ! ctype_alpha($name))
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{
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break;
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}
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if (in_array($name, self::$text_level_elements))
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{
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break;
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}
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$blocks []= $block;
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if (isset($is_self_closing))
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{
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$block = array(
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'type' => 'self-closing tag',
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'text' => $deindented_line,
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);
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unset($is_self_closing);
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continue 2;
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}
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$block = array(
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'type' => 'markup',
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'text' => $deindented_line,
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'start' => '<'.$name.'>',
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'end' => '</'.$name.'>',
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'depth' => 0,
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);
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if (strpos($deindented_line, $block['end']))
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{
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$block['closed'] = true;
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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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# quote
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if (preg_match('/^>[ ]?(.*)/', $deindented_line, $matches))
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{
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$blocks []= $block;
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$block = array(
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'type' => 'quote',
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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, $matches))
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{
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$blocks []= $block;
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$block = array(
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'type' => 'fenced',
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'text' => '',
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'fence' => $matches[1],
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);
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if (isset($matches[2]))
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{
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$block['language'] = $matches[2];
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}
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continue 2;
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}
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break;
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case '*':
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case '+':
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case '-':
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case '_':
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# hr
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if (preg_match('/^([-*_])([ ]{0,2}\1){2,}[ ]*$/', $deindented_line))
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{
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$blocks []= $block;
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$block = array(
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'type' => 'rule',
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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('/^[*+-][ ](.*)/', $deindented_line, $matches))
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{
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$blocks []= $block;
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$block = array(
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'type' => 'li',
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'indentation' => $indentation,
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'marker' => '[*+-]',
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'first' => true,
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'last' => true,
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'lines' => array(),
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);
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$block['lines'] []= preg_replace('/^[ ]{0,4}/', '', $matches[1]);
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continue 2;
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}
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}
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# list item
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if ($deindented_line[0] <= '9' and preg_match('/^\d+[.][ ](.*)/', $deindented_line, $matches))
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{
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$blocks []= $block;
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$block = array(
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'type' => 'li',
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'indentation' => $indentation,
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'marker' => '\d+[.]',
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'first' => true,
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'last' => true,
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'ordered' => true,
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'lines' => array(),
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);
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$block['lines'] []= preg_replace('/^[ ]{0,4}/', '', $matches[1]);
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continue;
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}
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# paragraph
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if ($block['type'] === 'paragraph')
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{
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if (isset($block['interrupted']))
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{
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$blocks []= $block;
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$block['text'] = $line;
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unset($block['interrupted']);
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}
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else
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{
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if ($this->breaks_enabled)
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{
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$block['text'] .= ' ';
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}
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$block['text'] .= "\n".$line;
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}
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}
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else
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{
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$blocks []= $block;
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$block = array(
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'type' => 'paragraph',
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'text' => $line,
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);
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}
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}
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$blocks []= $block;
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unset($blocks[0]);
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# $blocks » HTML
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$markup = '';
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foreach ($blocks as $block)
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{
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switch ($block['type'])
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{
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case 'paragraph':
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$text = $this->parse_span_elements($block['text']);
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if ($context === 'li' and $markup === '')
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{
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if (isset($block['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 .= $text;
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if (isset($blocks[2]))
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{
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$markup .= "\n";
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}
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}
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}
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else
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{
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$markup .= '<p>'.$text.'</p>'."\n";
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}
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break;
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case 'quote':
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$text = $this->parse_block_elements($block['lines']);
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$markup .= '<blockquote>'."\n".$text.'</blockquote>'."\n";
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break;
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case 'code':
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$text = htmlspecialchars($block['text'], ENT_NOQUOTES, 'UTF-8');
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$markup .= '<pre><code>'.$text.'</code></pre>'."\n";
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break;
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case 'fenced':
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$text = htmlspecialchars($block['text'], ENT_NOQUOTES, 'UTF-8');
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$markup .= '<pre><code';
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if (isset($block['language']))
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{
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$markup .= ' class="language-'.$block['language'].'"';
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}
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$markup .= '>'.$text.'</code></pre>'."\n";
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break;
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case 'heading':
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$text = $this->parse_span_elements($block['text']);
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$markup .= '<h'.$block['level'].'>'.$text.'</h'.$block['level'].'>'."\n";
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break;
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case 'rule':
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$markup .= '<hr />'."\n";
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break;
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case 'li':
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if (isset($block['first']))
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{
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$type = isset($block['ordered']) ? 'ol' : 'ul';
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$markup .= '<'.$type.'>'."\n";
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}
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if (isset($block['interrupted']) and ! isset($block['last']))
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{
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$block['lines'] []= '';
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}
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$text = $this->parse_block_elements($block['lines'], 'li');
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$markup .= '<li>'.$text.'</li>'."\n";
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if (isset($block['last']))
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{
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$type = isset($block['ordered']) ? 'ol' : 'ul';
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$markup .= '</'.$type.'>'."\n";
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}
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break;
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|
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case 'markup':
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$markup .= $block['text']."\n";
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break;
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default:
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$markup .= $block['text']."\n";
|
|
}
|
|
}
|
|
|
|
return $markup;
|
|
}
|
|
|
|
private function parse_span_elements($text, $markers = array(" \n", '![', '&', '*', '<', '[', '\\', '_', '`', 'http', '~~'))
|
|
{
|
|
if (isset($text[1]) === 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 + 1]) === 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 " \n":
|
|
|
|
$markup .= '<br />'."\n";
|
|
|
|
$offset = 3;
|
|
|
|
break;
|
|
|
|
case '![':
|
|
case '[':
|
|
|
|
if (strpos($text, ']') and preg_match('/\[((?:[^][]|(?R))*)\]/', $text, $matches))
|
|
{
|
|
$element = array(
|
|
'!' => $text[0] === '!',
|
|
'a' => $matches[1],
|
|
);
|
|
|
|
$offset = strlen($matches[0]);
|
|
|
|
if ($element['!'])
|
|
{
|
|
$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="'.$element['»'].'"';
|
|
|
|
if (isset($element['#']))
|
|
{
|
|
$markup .= ' title="'.$element['#'].'"';
|
|
}
|
|
|
|
$markup .= ' />';
|
|
}
|
|
else
|
|
{
|
|
$element['a'] = $this->parse_span_elements($element['a'], $markers);
|
|
|
|
$markup .= '<a href="'.$element['»'].'"';
|
|
|
|
if (isset($element['#']))
|
|
{
|
|
$markup .= ' title="'.$element['#'].'"';
|
|
}
|
|
|
|
$markup .= '>'.$element['a'].'</a>';
|
|
}
|
|
|
|
unset($element);
|
|
}
|
|
else
|
|
{
|
|
$markup .= $closest_marker;
|
|
|
|
$offset = $closest_marker === '![' ? 2 : 1;
|
|
}
|
|
|
|
break;
|
|
|
|
case '&':
|
|
|
|
if (preg_match('/^&#?\w+;/', $text, $matches))
|
|
{
|
|
$markup .= $matches[0];
|
|
|
|
$offset = strlen($matches[0]);
|
|
}
|
|
else
|
|
{
|
|
$markup .= '&';
|
|
|
|
$offset = 1;
|
|
}
|
|
|
|
break;
|
|
|
|
case '*':
|
|
case '_':
|
|
|
|
if ($text[1] === $closest_marker and preg_match(self::$strong_regex[$closest_marker], $text, $matches))
|
|
{
|
|
$matches[1] = $this->parse_span_elements($matches[1], $markers);
|
|
|
|
$markup .= '<strong>'.$matches[1].'</strong>';
|
|
}
|
|
elseif (preg_match(self::$em_regex[$closest_marker], $text, $matches))
|
|
{
|
|
$matches[1] = $this->parse_span_elements($matches[1], $markers);
|
|
|
|
$markup .= '<em>'.$matches[1].'</em>';
|
|
}
|
|
elseif ($text[1] === $closest_marker and preg_match(self::$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(self::$em_strong_regex[$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 (strpos($text, '@') > 1 and preg_match('/<(\S+?@\S+?)>/', $text, $matches))
|
|
{
|
|
$markup .= '<a href="mailto:'.$matches[1].'">'.$matches[1].'</a>';
|
|
|
|
$offset = strlen($matches[0]);
|
|
}
|
|
elseif (preg_match('/^<\/?\w.*?>/', $text, $matches))
|
|
{
|
|
$markup .= $matches[0];
|
|
|
|
$offset = strlen($matches[0]);
|
|
}
|
|
else
|
|
{
|
|
$markup .= '<';
|
|
|
|
$offset = 1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
$markup .= '<';
|
|
|
|
$offset = 1;
|
|
}
|
|
|
|
break;
|
|
|
|
case '\\':
|
|
|
|
if (in_array($text[1], self::$special_characters))
|
|
{
|
|
$markup .= $text[1];
|
|
|
|
$offset = 2;
|
|
}
|
|
else
|
|
{
|
|
$markup .= '\\';
|
|
|
|
$offset = 1;
|
|
}
|
|
|
|
break;
|
|
|
|
case '`':
|
|
|
|
if (preg_match('/^(`+)(.+?)\1(?!`)/', $text, $matches))
|
|
{
|
|
$element_text = $matches[2];
|
|
$element_text = htmlspecialchars($element_text, ENT_NOQUOTES, 'UTF-8');
|
|
|
|
$markup .= '<code>'.$element_text.'</code>';
|
|
|
|
$offset = strlen($matches[0]);
|
|
}
|
|
else
|
|
{
|
|
$markup .= '`';
|
|
|
|
$offset = 1;
|
|
}
|
|
|
|
break;
|
|
|
|
case 'http':
|
|
|
|
if (preg_match('/^https?:[\/]{2}[^\s]+\b/ui', $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;
|
|
}
|
|
|
|
return $markup;
|
|
}
|
|
|
|
#
|
|
# Fields
|
|
#
|
|
|
|
private $reference_map = array();
|
|
|
|
#
|
|
# Read-only
|
|
|
|
private static $strong_regex = array(
|
|
'*' => '/^[*]{2}([^*]+?)[*]{2}(?![*])/s',
|
|
'_' => '/^__([^_]+?)__(?!_)/us',
|
|
);
|
|
|
|
private static $em_regex = array(
|
|
'*' => '/^[*]([^*]+?)[*](?![*])/s',
|
|
'_' => '/^_([^_]+?)[_](?![_])\b/us',
|
|
);
|
|
|
|
private static $strong_em_regex = array(
|
|
'*' => '/^[*]{2}(.*?)[*](.+?)[*](.*?)[*]{2}/s',
|
|
'_' => '/^__(.*?)_(.+?)_(.*?)__/us',
|
|
);
|
|
|
|
private static $em_strong_regex = array(
|
|
'*' => '/^[*](.*?)[*]{2}(.+?)[*]{2}(.*?)[*]/s',
|
|
'_' => '/^_(.*?)__(.+?)__(.*?)_/us',
|
|
);
|
|
|
|
private static $special_characters = array(
|
|
'\\', '`', '*', '_', '{', '}', '[', ']', '(', ')', '>', '#', '+', '-', '.', '!',
|
|
);
|
|
|
|
private static $text_level_elements = array(
|
|
'a', 'br', 'bdo', 'abbr', 'blink', 'nextid', 'acronym', 'basefont',
|
|
'b', 'em', 'big', 'cite', 'small', 'spacer', 'listing',
|
|
'i', 'rp', 'sub', 'code', 'strike', 'marquee',
|
|
'q', 'rt', 'sup', 'font', 'strong',
|
|
's', 'tt', 'var', 'mark',
|
|
'u', 'xm', 'wbr', 'nobr',
|
|
'ruby',
|
|
'span',
|
|
'time',
|
|
);
|
|
}
|