mirror of
https://github.com/erusev/parsedown.git
synced 2023-08-10 21:13:06 +03:00
1179 lines
34 KiB
PHP
Executable File
1179 lines
34 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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#
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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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# 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 $breaks_enabled = false;
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#
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# Methods
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#
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function parse($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", $text);
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# iterate through lines to identify blocks
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$blocks = $this->find_blocks($lines);
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# iterate through blocks to build markup
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$markup = $this->compile($blocks);
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# trim line breaks
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$markup = trim($markup, "\n");
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return $markup;
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}
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#
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# Private
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private function find_blocks(array $lines, $block_context = null)
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{
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$block = null;
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$context = null;
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$context_data = null;
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foreach ($lines as $line)
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{
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$indented_line = $line;
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$indentation = 0;
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while(isset($line[$indentation]) and $line[$indentation] === ' ')
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{
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$indentation++;
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}
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if ($indentation > 0)
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{
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$line = ltrim($line);
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}
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# ~
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switch ($context)
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{
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case null:
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$context_data = null;
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if ($line === '')
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{
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continue 2;
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}
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break;
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# ~~~ javascript
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# var message = 'Hello!';
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case 'fenced code':
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if ($line === '')
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{
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$block['content'][0]['content'] .= "\n";
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continue 2;
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}
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if (preg_match('/^[ ]*'.$context_data['marker'].'{3,}[ ]*$/', $line))
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{
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$context = null;
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}
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else
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{
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if ($block['content'][0]['content'])
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{
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$block['content'][0]['content'] .= "\n";
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}
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$string = htmlspecialchars($line, ENT_NOQUOTES, 'UTF-8');
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$block['content'][0]['content'] .= $string;
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}
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continue 2;
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case 'markup':
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if (stripos($line, $context_data['start']) !== false) # opening tag
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{
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$context_data['depth']++;
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}
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if (stripos($line, $context_data['end']) !== false) # closing tag
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{
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if ($context_data['depth'] > 0)
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{
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$context_data['depth']--;
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}
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else
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{
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$context = null;
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}
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}
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$block['content'] .= "\n".$indented_line;
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continue 2;
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case 'li':
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if ($line === '')
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{
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$context_data['interrupted'] = true;
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continue 2;
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}
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if ($context_data['indentation'] === $indentation and preg_match('/^'.$context_data['marker'].'[ ]+(.*)/', $line, $matches))
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{
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if (isset($context_data['interrupted']))
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{
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$nested_block['content'] []= '';
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unset($context_data['interrupted']);
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}
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unset($nested_block);
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$nested_block = array(
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'name' => 'li',
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'content type' => 'markdown lines',
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'content' => array(
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$matches[1],
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),
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);
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$block['content'] []= & $nested_block;
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continue 2;
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}
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if (empty($context_data['interrupted']))
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{
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$value = $line;
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if ($indentation > $context_data['baseline'])
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{
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$value = str_repeat(' ', $indentation - $context_data['baseline']) . $value;
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}
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$nested_block['content'] []= $value;
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continue 2;
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}
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if ($indentation > 0)
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{
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$nested_block['content'] []= '';
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$value = $line;
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if ($indentation > $context_data['baseline'])
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{
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$value = str_repeat(' ', $indentation - $context_data['baseline']) . $value;
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}
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$nested_block['content'] []= $value;
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unset($context_data['interrupted']);
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continue 2;
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}
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$context = null;
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break;
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case 'quote':
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if ($line === '')
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{
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$context_data['interrupted'] = true;
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continue 2;
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}
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if (preg_match('/^>[ ]?(.*)/', $line, $matches))
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{
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$block['content'] []= $matches[1];
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continue 2;
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}
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if (empty($context_data['interrupted']))
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{
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$block['content'] []= $line;
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continue 2;
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}
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$context = null;
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break;
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case 'code':
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if ($line === '')
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{
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$context_data['interrupted'] = true;
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continue 2;
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}
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if ($indentation >= 4)
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{
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if (isset($context_data['interrupted']))
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{
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$block['content'][0]['content'] .= "\n";
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unset($context_data['interrupted']);
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}
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$block['content'][0]['content'] .= "\n";
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$string = htmlspecialchars($line, ENT_NOQUOTES, 'UTF-8');
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$string = str_repeat(' ', $indentation - 4) . $string;
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$block['content'][0]['content'] .= $string;
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continue 2;
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}
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$context = null;
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break;
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case 'paragraph':
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if ($line === '')
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{
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$block['name'] = 'p'; # dense li
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$context = null;
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continue 2;
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}
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if ($line[0] === '=' and chop($line, '=') === '')
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{
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$block['name'] = 'h1';
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$context = null;
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continue 2;
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}
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if ($line[0] === '-' and chop($line, '-') === '')
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{
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$block['name'] = 'h2';
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$context = null;
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continue 2;
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}
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break;
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default:
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throw new Exception('Unrecognized context - '.$context);
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}
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if ($indentation >= 4)
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{
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$blocks []= $block;
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$string = htmlspecialchars($line, ENT_NOQUOTES, 'UTF-8');
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$string = str_repeat(' ', $indentation - 4) . $string;
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$block = array(
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'name' => 'pre',
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'content type' => 'blocks',
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'content' => array(
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array(
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'name' => 'code',
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'content type' => 'markup',
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'content' => $string,
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),
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),
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);
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$context = 'code';
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continue;
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}
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switch ($line[0])
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{
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case '#':
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if (isset($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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$level++;
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}
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$string = trim($line, '# ');
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$string = $this->parse_span_elements($string);
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$block = array(
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'name' => 'h'.$level,
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'content type' => 'markdown',
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'content' => $string,
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);
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$context = null;
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continue 2;
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}
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break;
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case '<':
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$position = strpos($line, '>');
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if ($position > 1)
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{
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$substring = substr($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 = $substring;
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}
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$name = strtolower($name);
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if ($name[0] == 'h' and strpos('r123456', $name[1]) !== false) # hr, h1, h2, ...
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{
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if ($name == 'hr')
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{
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$is_self_closing = true;
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}
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}
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elseif ( ! ctype_alpha($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 []= $block;
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$block = array(
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'name' => null,
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'content type' => 'markup',
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'content' => $indented_line,
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);
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if (isset($is_self_closing))
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{
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unset($is_self_closing);
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continue 2;
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}
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$context = 'markup';
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$context_data = array(
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'start' => '<'.$name.'>',
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'end' => '</'.$name.'>',
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'depth' => 0,
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);
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if (stripos($line, $context_data['end']) !== false)
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{
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$context = null;
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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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if (preg_match('/^>[ ]?(.*)/', $line, $matches))
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{
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$blocks []= $block;
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$block = array(
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'name' => 'blockquote',
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'content type' => 'markdown lines',
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'content' => array(
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$matches[1],
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),
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);
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$context = 'quote';
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$context_data = array();
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continue 2;
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}
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break;
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case '[':
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$position = strpos($line, ']:');
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if ($position)
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{
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$reference = array();
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$label = substr($line, 1, $position - 1);
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$label = strtolower($label);
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$substring = substr($line, $position + 2);
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$substring = trim($substring);
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if ($substring === '')
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{
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break;
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}
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if ($substring[0] === '<')
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{
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$position = strpos($substring, '>');
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if ($position === false)
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{
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break;
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}
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$reference['link'] = substr($substring, 1, $position - 1);
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$substring = substr($substring, $position + 1);
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}
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else
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{
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$position = strpos($substring, ' ');
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if ($position === false)
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{
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$reference['link'] = $substring;
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$substring = false;
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}
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else
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{
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$reference['link'] = substr($substring, 0, $position);
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$substring = substr($substring, $position + 1);
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}
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}
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if ($substring !== false)
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{
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if ($substring[0] !== '"' and $substring[0] !== "'" and $substring[0] !== '(')
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{
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break;
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}
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$last_char = substr($substring, -1);
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if ($last_char !== '"' and $last_char !== "'" and $last_char !== ')')
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{
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break;
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}
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$reference['title'] = substr($substring, 1, -1);
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}
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$this->reference_map[$label] = $reference;
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continue 2;
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}
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break;
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|
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case '`':
|
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case '~':
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|
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if (preg_match('/^([`]{3,}|[~]{3,})[ ]*(\w+)?[ ]*$/', $line, $matches))
|
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{
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$blocks []= $block;
|
|
|
|
$block = array(
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'name' => 'pre',
|
|
'content type' => 'blocks',
|
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'content' => array(
|
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array(
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'name' => 'code',
|
|
'content type' => 'markup',
|
|
'content' => '',
|
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),
|
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),
|
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);
|
|
|
|
if (isset($matches[2]))
|
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{
|
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$block['content'][0]['attributes'] = array(
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'class' => 'language-'.$matches[2],
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);
|
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}
|
|
|
|
$context = 'fenced code';
|
|
$context_data = array(
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'marker' => $matches[1][0],
|
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);
|
|
|
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continue 2;
|
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}
|
|
|
|
break;
|
|
|
|
case '-':
|
|
case '*':
|
|
case '_':
|
|
|
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if (preg_match('/^([-*_])([ ]{0,2}\1){2,}[ ]*$/', $line))
|
|
{
|
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$blocks []= $block;
|
|
|
|
$block = array(
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'name' => 'hr',
|
|
'content' => null,
|
|
);
|
|
|
|
continue 2;
|
|
}
|
|
}
|
|
|
|
switch (true)
|
|
{
|
|
case $line[0] <= '-' and preg_match('/^([*+-][ ]+)(.*)/', $line, $matches):
|
|
case $line[0] <= '9' and preg_match('/^([0-9]+[.][ ]+)(.*)/', $line, $matches):
|
|
|
|
$blocks []= $block;
|
|
|
|
$name = $line[0] >= '0' ? 'ol' : 'ul';
|
|
|
|
$block = array(
|
|
'name' => $name,
|
|
'content type' => 'blocks',
|
|
'content' => array(),
|
|
);
|
|
|
|
unset($nested_block);
|
|
|
|
$nested_block = array(
|
|
'name' => 'li',
|
|
'content type' => 'markdown lines',
|
|
'content' => array(
|
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$matches[2],
|
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),
|
|
);
|
|
|
|
$block['content'] []= & $nested_block;
|
|
|
|
$baseline = $indentation + strlen($matches[1]);
|
|
|
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$marker = $line[0] >= '0' ? '[0-9]+[.]' : '[*+-]';
|
|
|
|
$context = 'li';
|
|
$context_data = array(
|
|
'indentation' => $indentation,
|
|
'baseline' => $baseline,
|
|
'marker' => $marker,
|
|
'lines' => array(
|
|
$matches[2],
|
|
),
|
|
);
|
|
|
|
continue 2;
|
|
}
|
|
|
|
if ($context === 'paragraph')
|
|
{
|
|
$block['content'] .= "\n".$line;
|
|
|
|
continue;
|
|
}
|
|
else
|
|
{
|
|
$blocks []= $block;
|
|
|
|
$block = array(
|
|
'name' => 'p',
|
|
'content type' => 'markdown',
|
|
'content' => $line,
|
|
);
|
|
|
|
if ($block_context === 'li' and empty($blocks[1]))
|
|
{
|
|
$block['name'] = null;
|
|
}
|
|
|
|
$context = 'paragraph';
|
|
}
|
|
}
|
|
|
|
if ($block_context === 'li' and $block['name'] === null)
|
|
{
|
|
return $block['content'];
|
|
}
|
|
|
|
$blocks []= $block;
|
|
|
|
unset($blocks[0]);
|
|
|
|
return $blocks;
|
|
}
|
|
|
|
private function compile(array $blocks)
|
|
{
|
|
$markup = '';
|
|
|
|
foreach ($blocks as $block)
|
|
{
|
|
$markup .= "\n";
|
|
|
|
if (isset($block['name']))
|
|
{
|
|
$markup .= '<'.$block['name'];
|
|
|
|
if (isset($block['attributes']))
|
|
{
|
|
foreach ($block['attributes'] as $name => $value)
|
|
{
|
|
$markup .= ' '.$name.'="'.$value.'"';
|
|
}
|
|
}
|
|
|
|
if ($block['content'] === null)
|
|
{
|
|
$markup .= ' />';
|
|
|
|
continue;
|
|
}
|
|
else
|
|
{
|
|
$markup .= '>';
|
|
}
|
|
}
|
|
|
|
switch ($block['content type'])
|
|
{
|
|
case 'markup':
|
|
|
|
$markup .= $block['content'];
|
|
|
|
break;
|
|
|
|
case 'markdown':
|
|
|
|
$markup .= $this->parse_span_elements($block['content']);
|
|
|
|
break;
|
|
|
|
case 'markdown lines':
|
|
|
|
$result = $this->find_blocks($block['content'], $block['name']);
|
|
|
|
if (is_string($result)) # dense li
|
|
{
|
|
$markup .= $this->parse_span_elements($result);
|
|
|
|
break;
|
|
}
|
|
|
|
$markup .= $this->compile($result);
|
|
|
|
break;
|
|
|
|
case 'blocks':
|
|
|
|
$markup .= $this->compile($block['content']);
|
|
|
|
break;
|
|
}
|
|
|
|
if (isset($block['name']))
|
|
{
|
|
$markup .= '</'.$block['name'].'>';
|
|
}
|
|
}
|
|
|
|
$markup .= "\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] === '!',
|
|
'text' => $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['link'] = $matches[1];
|
|
|
|
if (isset($matches[2]))
|
|
{
|
|
$element['title'] = $matches[2];
|
|
}
|
|
|
|
$offset += strlen($matches[0]);
|
|
}
|
|
elseif ($this->reference_map)
|
|
{
|
|
$reference = $element['text'];
|
|
|
|
if (preg_match('/^\s*\[(.*?)\]/', $remaining_text, $matches))
|
|
{
|
|
$reference = $matches[1] ? $matches[1] : $element['text'];
|
|
|
|
$offset += strlen($matches[0]);
|
|
}
|
|
|
|
$reference = strtolower($reference);
|
|
|
|
if (isset($this->reference_map[$reference]))
|
|
{
|
|
$element['link'] = $this->reference_map[$reference]['link'];
|
|
|
|
if (isset($this->reference_map[$reference]['title']))
|
|
{
|
|
$element['title'] = $this->reference_map[$reference]['title'];
|
|
}
|
|
}
|
|
else
|
|
{
|
|
unset($element);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
unset($element);
|
|
}
|
|
}
|
|
|
|
if (isset($element))
|
|
{
|
|
$element['link'] = str_replace('&', '&', $element['link']);
|
|
$element['link'] = str_replace('<', '<', $element['link']);
|
|
|
|
if ($element['!'])
|
|
{
|
|
$markup .= '<img alt="'.$element['text'].'" src="'.$element['link'].'"';
|
|
|
|
if (isset($element['title']))
|
|
{
|
|
$markup .= ' title="'.$element['title'].'"';
|
|
}
|
|
|
|
$markup .= ' />';
|
|
}
|
|
else
|
|
{
|
|
$element['text'] = $this->parse_span_elements($element['text'], $markers);
|
|
|
|
$markup .= '<a href="'.$element['link'].'"';
|
|
|
|
if (isset($element['title']))
|
|
{
|
|
$markup .= ' title="'.$element['title'].'"';
|
|
}
|
|
|
|
$markup .= '>'.$element['text'].'</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))
|
|
{
|
|
$markers[] = $closest_marker;
|
|
$matches[1] = $this->parse_span_elements($matches[1], $markers);
|
|
|
|
$markup .= '<strong>'.$matches[1].'</strong>';
|
|
}
|
|
elseif (preg_match(self::$em_regex[$closest_marker], $text, $matches))
|
|
{
|
|
$markers[] = $closest_marker;
|
|
$matches[1] = $this->parse_span_elements($matches[1], $markers);
|
|
|
|
$markup .= '<em>'.$matches[1].'</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 $markup;
|
|
}
|
|
|
|
#
|
|
# Static
|
|
|
|
static function instance($name = 'default')
|
|
{
|
|
if (isset(self::$instances[$name]))
|
|
{
|
|
return self::$instances[$name];
|
|
}
|
|
|
|
$instance = new Parsedown();
|
|
|
|
self::$instances[$name] = $instance;
|
|
|
|
return $instance;
|
|
}
|
|
|
|
private static $instances = array();
|
|
|
|
#
|
|
# Fields
|
|
#
|
|
|
|
private $reference_map = array();
|
|
|
|
#
|
|
# Read-only
|
|
|
|
private static $strong_regex = array(
|
|
'*' => '/^[*]{2}((?:[^*]|[*][^*]*[*])+?)[*]{2}(?![*])/s',
|
|
'_' => '/^__((?:[^_]|_[^_]*_)+?)__(?!_)/us',
|
|
);
|
|
|
|
private static $em_regex = array(
|
|
'*' => '/^[*]((?:[^*]|[*][*][^*]+?[*][*])+?)[*](?![*])/s',
|
|
'_' => '/^_((?:[^_]|__[^_]*__)+?)_(?!_)\b/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',
|
|
);
|
|
}
|