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);
# iterate through lines to identify blocks
$blocks = $this->find_blocks($lines);
# iterate through blocks to build markup
$markup = $this->compile($blocks);
# trim line breaks
$markup = trim($markup, "\n");
return $markup;
}
#
# Private
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 .= '';
}
}
$markup .= "\n";
return $markup;
}
private function find_blocks(array $lines, $block_context = null)
{
$block = null;
$context = null;
$context_data = null;
foreach ($lines as $line)
{
$indented_line = $line;
$indentation = 0;
while(isset($line[$indentation]) and $line[$indentation] === ' ')
{
$indentation++;
}
if ($indentation > 0)
{
$line = ltrim($line);
}
# ~
switch ($context)
{
case null:
$context_data = null;
if ($line === '')
{
continue 2;
}
break;
# ~~~ javascript
# var message = 'Hello!';
case 'fenced code':
if ($line === '')
{
$block['content'][0]['content'] .= "\n";
continue 2;
}
if (preg_match('/^[ ]*'.$context_data['marker'].'{3,}[ ]*$/', $line))
{
$context = null;
}
else
{
if ($block['content'][0]['content'])
{
$block['content'][0]['content'] .= "\n";
}
$string = htmlspecialchars($line, ENT_NOQUOTES, 'UTF-8');
$block['content'][0]['content'] .= $string;
}
continue 2;
case 'markup':
if (stripos($line, $context_data['start']) !== false) # opening tag
{
$context_data['depth']++;
}
if (stripos($line, $context_data['end']) !== false) # closing tag
{
if ($context_data['depth'] > 0)
{
$context_data['depth']--;
}
else
{
$context = null;
}
}
$block['content'] .= "\n".$indented_line;
continue 2;
case 'li':
if ($line === '')
{
$context_data['interrupted'] = true;
continue 2;
}
if ($context_data['indentation'] === $indentation and preg_match('/^'.$context_data['marker'].'[ ]+(.*)/', $line, $matches))
{
if (isset($context_data['interrupted']))
{
$nested_block['content'] []= '';
unset($context_data['interrupted']);
}
unset($nested_block);
$nested_block = array(
'name' => 'li',
'content type' => 'markdown lines',
'content' => array(
$matches[1],
),
);
$block['content'] []= & $nested_block;
continue 2;
}
if (empty($context_data['interrupted']))
{
$value = $line;
if ($indentation > $context_data['baseline'])
{
$value = str_repeat(' ', $indentation - $context_data['baseline']) . $value;
}
$nested_block['content'] []= $value;
continue 2;
}
if ($indentation > 0)
{
$nested_block['content'] []= '';
$value = $line;
if ($indentation > $context_data['baseline'])
{
$value = str_repeat(' ', $indentation - $context_data['baseline']) . $value;
}
$nested_block['content'] []= $value;
unset($context_data['interrupted']);
continue 2;
}
$context = null;
break;
case 'quote':
if ($line === '')
{
$context_data['interrupted'] = true;
continue 2;
}
if (preg_match('/^>[ ]?(.*)/', $line, $matches))
{
$block['content'] []= $matches[1];
continue 2;
}
if (empty($context_data['interrupted']))
{
$block['content'] []= $line;
continue 2;
}
$context = null;
break;
case 'code':
if ($line === '')
{
$context_data['interrupted'] = true;
continue 2;
}
if ($indentation >= 4)
{
if (isset($context_data['interrupted']))
{
$block['content'][0]['content'] .= "\n";
unset($context_data['interrupted']);
}
$block['content'][0]['content'] .= "\n";
$string = htmlspecialchars($line, ENT_NOQUOTES, 'UTF-8');
$string = str_repeat(' ', $indentation - 4) . $string;
$block['content'][0]['content'] .= $string;
continue 2;
}
$context = null;
break;
case 'paragraph':
if ($line === '')
{
$block['name'] = 'p'; # dense li
$context = null;
continue 2;
}
if ($line[0] === '=' and chop($line, '=') === '')
{
$block['name'] = 'h1';
$context = null;
continue 2;
}
if ($line[0] === '-' and chop($line, '-') === '')
{
$block['name'] = 'h2';
$context = null;
continue 2;
}
break;
default:
throw new Exception('Unrecognized context - '.$context);
}
if ($indentation >= 4)
{
$blocks []= $block;
$string = htmlspecialchars($line, ENT_NOQUOTES, 'UTF-8');
$string = str_repeat(' ', $indentation - 4) . $string;
$block = array(
'name' => 'pre',
'content type' => 'blocks',
'content' => array(
array(
'name' => 'code',
'content type' => 'markup',
'content' => $string,
),
),
);
$context = 'code';
continue;
}
switch ($line[0])
{
case '#':
if (isset($line[1]))
{
$blocks []= $block;
$level = 1;
while (isset($line[$level]) and $line[$level] === '#')
{
$level++;
}
$string = trim($line, '# ');
$string = $this->parse_span_elements($string);
$block = array(
'name' => 'h'.$level,
'content type' => 'markdown',
'content' => $string,
);
$context = null;
continue 2;
}
break;
case '<':
$position = strpos($line, '>');
if ($position > 1)
{
$substring = substr($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;
}
$name = strtolower($name);
if ($name[0] == 'h' and strpos('r123456', $name[1]) !== false) # hr, h1, h2, ...
{
if ($name == 'hr')
{
$is_self_closing = true;
}
}
elseif ( ! ctype_alpha($name))
{
break;
}
if (in_array($name, self::$text_level_elements))
{
break;
}
$blocks []= $block;
$block = array(
'name' => null,
'content type' => 'markup',
'content' => $indented_line,
);
if (isset($is_self_closing))
{
unset($is_self_closing);
continue 2;
}
$context = 'markup';
$context_data = array(
'start' => '<'.$name.'>',
'end' => '',
'depth' => 0,
);
if (stripos($line, $context_data['end']) !== false)
{
$context = null;
}
continue 2;
}
break;
case '>':
if (preg_match('/^>[ ]?(.*)/', $line, $matches))
{
$blocks []= $block;
$block = array(
'name' => 'blockquote',
'content type' => 'markdown lines',
'content' => array(
$matches[1],
),
);
$context = 'quote';
$context_data = array();
continue 2;
}
break;
case '[':
$position = strpos($line, ']:');
if ($position)
{
$reference = array();
$label = substr($line, 1, $position - 1);
$label = strtolower($label);
$substring = substr($line, $position + 2);
$substring = trim($substring);
if ($substring === '')
{
break;
}
if ($substring[0] === '<')
{
$position = strpos($substring, '>');
if ($position === false)
{
break;
}
$reference['link'] = substr($substring, 1, $position - 1);
$substring = substr($substring, $position + 1);
}
else
{
$position = strpos($substring, ' ');
if ($position === false)
{
$reference['link'] = $substring;
$substring = false;
}
else
{
$reference['link'] = substr($substring, 0, $position);
$substring = substr($substring, $position + 1);
}
}
if ($substring !== false)
{
if ($substring[0] !== '"' and $substring[0] !== "'" and $substring[0] !== '(')
{
break;
}
$last_char = substr($substring, -1);
if ($last_char !== '"' and $last_char !== "'" and $last_char !== ')')
{
break;
}
$reference['title'] = substr($substring, 1, -1);
}
$this->reference_map[$label] = $reference;
continue 2;
}
break;
case '`':
case '~':
if (preg_match('/^([`]{3,}|[~]{3,})[ ]*(\w+)?[ ]*$/', $line, $matches))
{
$blocks []= $block;
$block = array(
'name' => 'pre',
'content type' => 'blocks',
'content' => array(
array(
'name' => 'code',
'content type' => 'markup',
'content' => '',
),
),
);
if (isset($matches[2]))
{
$block['content'][0]['attributes'] = array(
'class' => 'language-'.$matches[2],
);
}
$context = 'fenced code';
$context_data = array(
'marker' => $matches[1][0],
);
continue 2;
}
break;
case '-':
case '*':
case '_':
if (preg_match('/^([-*_])([ ]{0,2}\1){2,}[ ]*$/', $line))
{
$blocks []= $block;
$block = array(
'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(
$matches[2],
),
);
$block['content'] []= & $nested_block;
$baseline = $indentation + strlen($matches[1]);
$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 $blocks;
}
private function parse_span_elements($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] === '!',
'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['!'])
{
$markup .= '!['.$element['text'].']('.$element['link'].')
parse_span_elements($element['text'], $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))
{
$markers[] = $closest_marker;
$matches[1] = $this->parse_span_elements($matches[1], $markers);
$markup .= ''.$matches[1].'';
}
elseif (preg_match(self::$em_regex[$closest_marker], $text, $matches))
{
$markers[] = $closest_marker;
$matches[1] = $this->parse_span_elements($matches[1], $markers);
$markup .= ''.$matches[1].'';
}
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 .= '\\';
$offset = 1;
}
break;
case '`':
if (preg_match('/^(`+)[ ]*(.+?)[ ]*(?'.$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 $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',
);
}