mirror of
https://github.com/erusev/parsedown.git
synced 2023-08-10 21:13:06 +03:00
534 lines
11 KiB
PHP
Executable File
534 lines
11 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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# Extracts link references.
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if (preg_match_all('/^[ ]{0,3}\[(.+)\][ ]?:[ ]*\n?[ ]*(.+)$/m', $text, $matches, PREG_SET_ORDER))
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{
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foreach ($matches as $matches)
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{
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$this->reference_map[strtolower($matches[1])] = $matches[2];
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$text = str_replace($matches[0], '', $text);
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}
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}
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# ~
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$text = trim($text, "\n");
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$text = preg_replace('/\n\s*\n/', "\n\n", $text);
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$text = $this->parse_lines($text);
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# Decodes escape sequences (leaves out backslashes).
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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 $text;
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}
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#
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# Private Methods
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#
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private function parse_lines($text, $context = null)
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{
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$lines = explode("\n", $text);
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$lines []= NULL;
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$line_count = count($lines);
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$markup = '';
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foreach ($lines as $index => $line)
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{
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# Quick Line
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if (isset($line) and $line !== '' and $line[0] >= 'A')
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{
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$quick_line = $line;
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unset($line);
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}
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# Setext Heading (-)
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if (isset($line) and $line !== '' and isset($paragraph) and preg_match('/^[-]+[ ]*$/', $line))
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{
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$setext_heading_text = $this->parse_inline_elements($paragraph);
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$markup .= '<h2>'.$setext_heading_text.'</h2>'."\n";
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unset($paragraph, $line);
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continue;
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}
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# Rule
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if (isset($line) and preg_match('/^[ ]{0,3}([-*_])([ ]{0,2}\1){2,}[ ]*$/', $line))
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{
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$rule = true;
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unset($line);
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}
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elseif (isset($rule))
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{
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$markup .= '<hr />'."\n";
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unset($rule);
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}
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# List
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# Unlike other types, consequent lines of type "list items" may not
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# belong to the same block.
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if (isset($line) and $line !== '' and preg_match('/^([ ]{0,3})(\d+[.]|[*+-])[ ](.*)/', $line, $matches)) # list item
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{
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$list_item_indentation = $matches[1];
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$list_item_type = ($matches[2] === '-' or $matches[2] === '+' or $matches[2] === '*')
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? 'ul'
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: 'ol';
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if (isset($list_items)) # subsequent
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{
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if ($list_item_indentation === $list_indentation and $list_item_type === $list_type)
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{
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$list_items []= $list_item;
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$list_item = $matches[3];
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}
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else
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{
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$list_item .= "\n".$line;
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}
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}
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else # first
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{
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$list_indentation = $list_item_indentation;
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$list_type = $list_item_type;
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$list_item = $matches[3];
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$list_items = array();
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}
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unset($line);
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}
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elseif (isset($list_items)) # incomplete list item
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{
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if (isset($line) and ($line === '' or $line[0] === ' '))
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{
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$line and $line = preg_replace('/^[ ]{0,4}/', '', $line);;
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$list_item .= "\n".$line;
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unset($line);
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}
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else # line is consumed or does not belong to the list item
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{
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$list_item = rtrim($list_item, "\n");
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$list_items []= $list_item;
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$markup .= '<'.$list_type.'>'."\n";
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foreach ($list_items as $list_item)
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{
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$list_item_text = strpos($list_item, "\n") !== false
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? $this->parse_lines($list_item, 'li')
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: $this->parse_inline_elements($list_item);
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$markup .= '<li>'.$list_item_text.'</li>'."\n";
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}
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$markup .= '</'.$list_type.'>'."\n";
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unset($list_items);
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}
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}
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# Code Block
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if (isset($line) and $line !== '' and preg_match('/^[ ]{4}(.*)/', $line, $matches))
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{
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if (isset($code_block))
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{
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$code_block .= "\n".$matches[1];
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}
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else
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{
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$code_block = $matches[1];
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}
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unset($line);
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}
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elseif (isset($code_block))
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{
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if (isset($line) and $line === '')
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{
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$code_block .= "\n";
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# » continue;
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}
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else
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{
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$code_block = rtrim($code_block);
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$code_block_text = htmlentities($code_block, ENT_NOQUOTES);
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# Decodes encoded escape sequences if present.
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strpos($code_block_text, "\x1A\\") !== FALSE and $code_block_text = strtr($code_block_text, $this->escape_sequence_map);
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$markup .= '<pre><code>'.$code_block_text.'</code></pre>'."\n";
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unset($code_block);
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}
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}
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# Quote Block
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if (isset($line) and $line !== '' and preg_match('/^[ ]*>[ ]?(.*)/', $line, $matches))
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{
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if (isset($blockquote))
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{
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$blockquote .= "\n".$matches[1];
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$blockquote_is_multiline = true;
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}
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else
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{
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$blockquote = $matches[1];
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$blockquote_is_multiline = false;
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}
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unset($line);
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}
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elseif (isset($blockquote))
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{
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if (isset($line) and $line === '')
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{
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$blockquote .= "\n";
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$blockquote_is_multiline = true;
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}
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else
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{
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$blockquote = $blockquote_is_multiline
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? $this->parse_lines($blockquote)
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: '<p>'.$this->parse_inline_elements($blockquote).'</p>'."\n";
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$markup .= '<blockquote>'."\n".$blockquote.'</blockquote>'."\n";
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unset($blockquote);
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}
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}
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# Atx Heading
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if (isset($line) and $line !== '' and $line[0] === '#' and preg_match('/^(#{1,6})[ ]*(.+?)[ ]*#*$/', $line, $matches))
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{
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$atx_heading_level = strlen($matches[1]);
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$atx_heading = $this->parse_inline_elements($matches[2]);
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unset($line);
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}
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elseif (isset($atx_heading))
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{
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$markup .= '<h'.$atx_heading_level.'>'.$atx_heading.'</h'.$atx_heading_level.'>'."\n";
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unset($atx_heading);
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}
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# Setext Heading (=)
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if (isset($line) and $line !== '' and isset($paragraph) and preg_match('/^[=]+[ ]*$/', $line))
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{
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$setext_heading_text = $this->parse_inline_elements($paragraph);
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$markup .= '<h1>'.$setext_heading_text.'</h1>'."\n";
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unset($paragraph, $line);
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continue;
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}
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# Paragraph
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if (isset($quick_line))
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{
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$line = $quick_line;
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unset($quick_line);
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}
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if (isset($line) and $line !== '')
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{
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substr($line, -2) === ' ' and $line = substr_replace($line, '<br />', -2);
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if (isset($paragraph))
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{
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$paragraph .= "\n".$line;
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}
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else
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{
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$paragraph = $line;
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}
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}
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elseif (isset($paragraph))
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{
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$paragraph_text = $this->parse_inline_elements($paragraph);
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if ($context === 'li')
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{
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if ( ! $markup and $index + 1 === $line_count)
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{
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$text_is_simple = true;
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}
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else
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{
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$markup or $markup .= "\n";
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}
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$markup .= isset($text_is_simple)
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? $paragraph_text
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: '<p>'.$paragraph_text.'</p>'."\n";
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}
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else
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{
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$markup .= '<p>'.$paragraph_text.'</p>'."\n";
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}
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unset($paragraph);
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}
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}
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return $markup;
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}
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private function parse_inline_elements($text)
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{
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$map = array();
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$index = 0;
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# Code Span
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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 = htmlentities($element_text, ENT_NOQUOTES);
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# Decodes escape sequences.
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$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] = $element;
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$index ++;
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}
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}
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# Reference(d) Link / Image
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if ($this->reference_map and strpos($text, '[') !== FALSE and preg_match_all('/(!?)\[(.+?)\](?:\n?[ ]?\[(.*?)\])?/ms', $text, $matches, PREG_SET_ORDER))
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{
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foreach ($matches as $matches)
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{
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$link_difinition = isset($matches[3]) && $matches[3]
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? $matches[3]
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: $matches[2]; # implicit
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$link_difinition = strtolower($link_difinition);
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if (isset($this->reference_map[$link_difinition]))
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{
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$url = $this->reference_map[$link_difinition];
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if ($matches[1]) # image
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{
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$element = '<img alt="'.$matches[2].'" src="'.$url.'">';
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}
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else # anchor
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{
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$element_text = $this->parse_inline_elements($matches[2]);
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$element = '<a href="'.$url.'">'.$element_text.'</a>';
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}
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# ~
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$code = "\x1A".'$'.$index;
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$text = str_replace($matches[0], $code, $text);
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$map[$code] = $element;
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$index ++;
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}
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}
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}
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# Inline Link / Image
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if (strpos($text, '](') !== FALSE and preg_match_all('/(!?)(\[((?:[^][]+|(?2))*)\])\((.*?)\)/', $text, $matches, PREG_SET_ORDER)) # inline
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{
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foreach ($matches as $matches)
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{
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if ($matches[1]) # image
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{
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$element = '<img alt="'.$matches[3].'" src="'.$matches[4].'">';
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}
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else
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{
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$element_text = $this->parse_inline_elements($matches[3]);
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$element = '<a href="'.$matches[4].'">'.$element_text.'</a>';
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}
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$element_text = $this->parse_inline_elements($matches[1]);
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# ~
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$code = "\x1A".'$'.$index;
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$text = str_replace($matches[0], $code, $text);
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$map[$code] = $element;
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$index ++;
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}
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}
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if (strpos($text, '<') !== FALSE and preg_match_all('/<((https?|ftp|dict):[^\^\s]+?)>/i', $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 = '<a href=":href">:text</a>';
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$element = str_replace(':text', $matches[1], $element);
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$element = str_replace(':href', $matches[1], $element);
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# ~
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$code = "\x1A".'$'.$index;
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$text = str_replace($matches[0], $code, $text);
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$map[$code] = $element;
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$index ++;
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}
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}
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if (strpos($text, '_') !== FALSE)
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{
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$text = preg_replace('/__(?=\S)(.+?)(?<=\S)__/', '<strong>$1</strong>', $text);
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$text = preg_replace('/_(?=\S)(.+?)(?<=\S)_/', '<em>$1</em>', $text);
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}
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if (strpos($text, '*') !== FALSE)
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{
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$text = preg_replace('/\*\*(?=\S)(.+?)(?<=\S)\*\*/', '<strong>$1</strong>', $text);
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$text = preg_replace('/\*(?=\S)(.+?)(?<=\S)\*/', '<em>$1</em>', $text);
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}
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$text = strtr($text, $map);
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return $text;
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}
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}
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