breaks_enabled = $breaks_enabled;
return $this;
}
private $breaks_enabled = false;
#
# Synopsis
#
# Markdown is intended to be easy-to-read by humans - those of us who read
# line by line, left to right, top to bottom. In order to take advantage of
# this, Parsedown tries to read in a similar way. It breaks texts into
# lines, it iterates through them and it looks at how they start and relate
# to each other.
#
# Methods
#
function parse($text)
{
# standardize line breaks
$text = str_replace("\r\n", "\n", $text);
$text = str_replace("\r", "\n", $text);
# replace tabs with spaces
$text = str_replace("\t", ' ', $text);
# remove surrounding line breaks
$text = trim($text, "\n");
# split text into lines
$lines = explode("\n", $text);
# convert lines into html
$text = $this->parse_block_elements($lines);
# remove trailing line breaks
$text = chop($text, "\n");
return $text;
}
#
# Private
private function parse_block_elements(array $lines, $context = '')
{
$blocks = array();
$block = array(
'type' => '',
);
foreach ($lines as $line)
{
# context
switch ($block['type'])
{
case 'fenced':
if ( ! isset($block['closed']))
{
if (preg_match('/^[ ]*'.$block['fence'][0].'{3,}[ ]*$/', $line))
{
$block['closed'] = true;
}
else
{
if ($block['text'] !== '')
{
$block['text'] .= "\n";
}
$block['text'] .= $line;
}
continue 2;
}
break;
case 'markup':
if ( ! isset($block['closed']))
{
if (strpos($line, $block['start']) !== false) # opening tag
{
$block['depth']++;
}
if (strpos($line, $block['end']) !== false) # closing tag
{
if ($block['depth'] > 0)
{
$block['depth']--;
}
else
{
$block['closed'] = true;
}
}
$block['text'] .= "\n".$line;
continue 2;
}
break;
}
# ~
$indentation = 0;
while(isset($line[$indentation]) and $line[$indentation] === ' ')
{
$indentation++;
}
$deindented_line = $indentation > 0 ? ltrim($line) : $line;
# blank
if ($deindented_line === '')
{
$block['interrupted'] = true;
continue;
}
# context
switch ($block['type'])
{
case 'quote':
if ( ! isset($block['interrupted']))
{
$line = preg_replace('/^[ ]*>[ ]?/', '', $line);
$block['lines'] []= $line;
continue 2;
}
break;
case 'li':
if ($block['indentation'] === $indentation and preg_match('/^'.$block['marker'].'[ ](.*)/', $deindented_line, $matches))
{
unset($block['last']);
$blocks []= $block;
unset($block['first']);
$block['last'] = true;
$block['lines'] = array();
$block['lines'] []= preg_replace('/^[ ]{0,4}/', '', $matches[1]);
continue 2;
}
if ( ! isset($block['interrupted']))
{
$line = preg_replace('/^[ ]{0,4}/', '', $line);
$block['lines'] []= $line;
continue 2;
}
elseif ($line[0] === ' ')
{
$block['lines'] []= '';
$line = preg_replace('/^[ ]{0,4}/', '', $line);
$block['lines'] []= $line;
unset($block['interrupted']);
continue 2;
}
break;
}
# indentation sensitive types
switch ($line[0])
{
case ' ':
# code
if ($indentation >= 4)
{
$code_line = substr($line, 4);
if ($block['type'] === 'code')
{
if (isset($block['interrupted']))
{
$block['text'] .= "\n";
unset($block['interrupted']);
}
$block['text'] .= "\n".$code_line;
}
else
{
$blocks []= $block;
$block = array(
'type' => 'code',
'text' => $code_line,
);
}
continue 2;
}
break;
case '#':
# atx heading (#)
if (isset($line[1]))
{
$blocks []= $block;
$level = 1;
while (isset($line[$level]) and $line[$level] === '#')
{
$level++;
}
$block = array(
'type' => 'heading',
'text' => trim($line, '# '),
'level' => $level,
);
continue 2;
}
break;
case '-':
case '=':
# setext heading (===)
if ($block['type'] === 'paragraph' and isset($block['interrupted']) === false)
{
$chopped_line = chop($line);
$i = 1;
while (isset($chopped_line[$i]))
{
if ($chopped_line[$i] !== $line[0])
{
break 2;
}
$i++;
}
$block['type'] = 'heading';
$block['level'] = $line[0] === '-' ? 2 : 1;
continue 2;
}
break;
}
# indentation insensitive types
switch ($deindented_line[0])
{
case '<':
$position = strpos($deindented_line, '>');
if ($position > 1)
{
$substring = substr($deindented_line, 1, $position - 1);
$substring = chop($substring);
if (substr($substring, -1) === '/')
{
$is_self_closing = true;
$substring = substr($substring, 0, -1);
}
$position = strpos($substring, ' ');
if ($position)
{
$name = substr($substring, 0, $position);
}
else
{
$name = $substring;
}
if ( ! ctype_alpha($name))
{
break;
}
if (in_array($name, self::$text_level_elements))
{
break;
}
$blocks []= $block;
if (isset($is_self_closing))
{
$block = array(
'type' => 'self-closing tag',
'text' => $deindented_line,
);
unset($is_self_closing);
continue 2;
}
$block = array(
'type' => 'markup',
'text' => $deindented_line,
'start' => '<'.$name.'>',
'end' => '',
'depth' => 0,
);
if (strpos($deindented_line, $block['end']))
{
$block['closed'] = true;
}
continue 2;
}
break;
case '>':
# quote
if (preg_match('/^>[ ]?(.*)/', $deindented_line, $matches))
{
$blocks []= $block;
$block = array(
'type' => 'quote',
'lines' => array(
$matches[1],
),
);
continue 2;
}
break;
case '[':
# reference
if (preg_match('/^\[(.+?)\]:[ ]*(.+?)(?:[ ]+[\'"](.+?)[\'"])?[ ]*$/', $deindented_line, $matches))
{
$label = strtolower($matches[1]);
$this->reference_map[$label] = array(
'»' => trim($matches[2], '<>'),
);
if (isset($matches[3]))
{
$this->reference_map[$label]['#'] = $matches[3];
}
continue 2;
}
break;
case '`':
case '~':
# fenced code block
if (preg_match('/^([`]{3,}|[~]{3,})[ ]*(\S+)?[ ]*$/', $deindented_line, $matches))
{
$blocks []= $block;
$block = array(
'type' => 'fenced',
'text' => '',
'fence' => $matches[1],
);
if (isset($matches[2]))
{
$block['language'] = $matches[2];
}
continue 2;
}
break;
case '*':
case '+':
case '-':
case '_':
# hr
if (preg_match('/^([-*_])([ ]{0,2}\1){2,}[ ]*$/', $deindented_line))
{
$blocks []= $block;
$block = array(
'type' => 'rule',
);
continue 2;
}
# li
if (preg_match('/^[*+-][ ](.*)/', $deindented_line, $matches))
{
$blocks []= $block;
$block = array(
'type' => 'li',
'indentation' => $indentation,
'marker' => '[*+-]',
'first' => true,
'last' => true,
'lines' => array(),
);
$block['lines'] []= preg_replace('/^[ ]{0,4}/', '', $matches[1]);
continue 2;
}
}
# list item
if ($deindented_line[0] <= '9' and preg_match('/^\d+[.][ ](.*)/', $deindented_line, $matches))
{
$blocks []= $block;
$block = array(
'type' => 'li',
'indentation' => $indentation,
'marker' => '\d+[.]',
'first' => true,
'last' => true,
'ordered' => true,
'lines' => array(),
);
$block['lines'] []= preg_replace('/^[ ]{0,4}/', '', $matches[1]);
continue;
}
# paragraph
if ($block['type'] === 'paragraph')
{
if (isset($block['interrupted']))
{
$blocks []= $block;
$block['text'] = $line;
unset($block['interrupted']);
}
else
{
if ($this->breaks_enabled)
{
$block['text'] .= ' ';
}
$block['text'] .= "\n".$line;
}
}
else
{
$blocks []= $block;
$block = array(
'type' => 'paragraph',
'text' => $line,
);
}
}
$blocks []= $block;
unset($blocks[0]);
# $blocks » HTML
$markup = '';
foreach ($blocks as $block)
{
switch ($block['type'])
{
case 'paragraph':
$text = $this->parse_span_elements($block['text']);
if ($context === 'li' and $markup === '')
{
if (isset($block['interrupted']))
{
$markup .= "\n".''.$text.'
'."\n";
}
else
{
$markup .= $text;
if (isset($blocks[2]))
{
$markup .= "\n";
}
}
}
else
{
$markup .= ''.$text.'
'."\n";
}
break;
case 'quote':
$text = $this->parse_block_elements($block['lines']);
$markup .= ''."\n".$text.'
'."\n";
break;
case 'code':
$text = htmlspecialchars($block['text'], ENT_NOQUOTES, 'UTF-8');
$markup .= ''.$text.'
'."\n";
break;
case 'fenced':
$text = htmlspecialchars($block['text'], ENT_NOQUOTES, 'UTF-8');
$markup .= '
'."\n";
break;
case 'heading':
$text = $this->parse_span_elements($block['text']);
$markup .= ''.$text.''."\n";
break;
case 'rule':
$markup .= '
'."\n";
break;
case 'li':
if (isset($block['first']))
{
$type = isset($block['ordered']) ? 'ol' : 'ul';
$markup .= '<'.$type.'>'."\n";
}
if (isset($block['interrupted']) and ! isset($block['last']))
{
$block['lines'] []= '';
}
$text = $this->parse_block_elements($block['lines'], 'li');
$markup .= ''.$text.''."\n";
if (isset($block['last']))
{
$type = isset($block['ordered']) ? 'ol' : 'ul';
$markup .= ''."\n";
}
break;
case 'markup':
$markup .= $block['text']."\n";
break;
default:
$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 .= '
'."\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['!'])
{
$markup .= '!['.$element['a'].']('.$element['»'].')
parse_span_elements($element['a'], $markers);
$markup .= '';
}
unset($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);
$markup .= ''.$matches[1].'';
}
elseif (preg_match(self::$em_regex[$closest_marker], $text, $matches))
{
$matches[1] = $this->parse_span_elements($matches[1], $markers);
$markup .= ''.$matches[1].'';
}
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);
$markup .= ''.$matches[1].''.$matches[2].''.$matches[3].'';
}
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);
$markup .= ''.$matches[1].''.$matches[2].''.$matches[3].'';
}
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);
$markup .= ''.$element_url.'';
$offset = strlen($matches[0]);
}
elseif (strpos($text, '@') > 1 and preg_match('/<(\S+?@\S+?)>/', $text, $matches))
{
$markup .= ''.$matches[1].'';
$offset = strlen($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');
$markup .= ''.$element_text.'';
$offset = strlen($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);
$markup .= ''.$element_url.'';
$offset = strlen($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);
$markup .= ''.$matches[1].'';
$offset = strlen($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',
);
}