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HyperDown.php
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HyperDown.php
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<?php
/**
* Parser
*
* @copyright Copyright (c) 2012 SegmentFault Team. (http://segmentfault.com)
* @author Joyqi <joyqi@segmentfault.com>
* @license BSD License
*/
class HyperDown
{
/**
* _whiteList
*
* @var string
*/
public $_commonWhiteList = 'kbd|b|i|strong|em|sup|sub|br|code|del|a|hr|small';
/**
* html tags
*
* @var string
*/
public $_blockHtmlTags = 'p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|address|form|fieldset|iframe|hr|legend|article|section|nav|aside|hgroup|header|footer|figcaption|svg|script|noscript';
/**
* _specialWhiteList
*
* @var mixed
* @access private
*/
public $_specialWhiteList = array(
'table' => 'table|tbody|thead|tfoot|tr|td|th'
);
/**
* _footnotes
*
* @var array
*/
public $_footnotes;
/**
* @var bool
*/
public $_html = false;
/**
* @var array
*/
public $blockParsers = array(
array('code', 10),
array('shtml', 20),
array('pre', 30),
array('ahtml', 40),
array('list', 50),
array('math', 60),
array('html', 70),
array('footnote', 80),
array('definition', 90),
array('quote', 100),
array('table', 110),
array('sh', 120),
array('mh', 130),
array('hr', 140),
array('default', 9999)
);
/**
* _blocks
*
* @var array
*/
private $_blocks;
/**
* _current
*
* @var string
*/
private $_current;
/**
* _pos
*
* @var int
*/
private $_pos;
/**
* _definitions
*
* @var array
*/
public $_definitions;
/**
* @var array
*/
private $_hooks = array();
/**
* @var array
*/
private $_holders;
/**
* @var string
*/
private $_uniqid;
/**
* @var int
*/
private $_id;
/**
* @var array
*/
private $_parsers = array();
/**
* makeHtml
*
* @param mixed $text
* @return string
*/
public function makeHtml($text)
{
$this->_footnotes = array();
$this->_definitions = array();
$this->_holders = array();
$this->_uniqid = md5(uniqid());
$this->_id = 0;
usort($this->blockParsers, function ($a, $b) {
return $a[1] < $b[1] ? -1 : 1;
});
foreach ($this->blockParsers as $parser) {
list ($name) = $parser;
if (isset($parser[2])) {
$this->_parsers[$name] = $parser[2];
} else {
$this->_parsers[$name] = array($this, 'parseBlock' . ucfirst($name));
}
}
$text = $this->initText($text);
$html = $this->parse($text);
$html = $this->makeFootnotes($html);
return $this->call('makeHtml', $html);
}
/**
* @param $html
*/
public function enableHtml($html = true)
{
$this->_html = $html;
}
/**
* @param $type
* @param $callback
*/
public function hook($type, $callback)
{
$this->_hooks[$type][] = $callback;
}
/**
* @param $str
* @return string
*/
public function makeHolder($str)
{
$key = "\r" . $this->_uniqid . $this->_id . "\r";
$this->_id ++;
$this->_holders[$key] = $str;
return $key;
}
/**
* @param $text
* @return mixed
*/
private function initText($text)
{
$text = str_replace(array("\t", "\r"), array(' ', ''), $text);
return $text;
}
/**
* @param $html
* @return string
*/
private function makeFootnotes($html)
{
if (count($this->_footnotes) > 0) {
$html .= '<div class="footnotes"><hr><ol>';
$index = 1;
while ($val = array_shift($this->_footnotes)) {
if (is_string($val)) {
$val .= " <a href=\"#fnref-{$index}\" class=\"footnote-backref\">↩</a>";
} else {
$val[count($val) - 1] .= " <a href=\"#fnref-{$index}\" class=\"footnote-backref\">↩</a>";
$val = count($val) > 1 ? $this->parse(implode("\n", $val)) : $this->parseInline($val[0]);
}
$html .= "<li id=\"fn-{$index}\">{$val}</li>";
$index ++;
}
$html .= '</ol></div>';
}
return $html;
}
/**
* parse
*
* @param string $text
* @param bool $inline
* @return string
*/
private function parse($text, $inline = false)
{
$blocks = $this->parseBlock($text, $lines);
$html = '';
// inline mode for single normal block
if ($inline && count($blocks) == 1 && $blocks[0][0] == 'normal') {
$blocks[0][3] = true;
}
foreach ($blocks as $block) {
list ($type, $start, $end, $value) = $block;
$extract = array_slice($lines, $start, $end - $start + 1);
$method = 'parse' . ucfirst($type);
$extract = $this->call('before' . ucfirst($method), $extract, $value);
$result = $this->{$method}($extract, $value);
$result = $this->call('after' . ucfirst($method), $result, $value);
$html .= $result;
}
return $html;
}
/**
* @param $text
* @param $clearHolders
* @return string
*/
private function releaseHolder($text, $clearHolders = true)
{
$deep = 0;
while (strpos($text, "\r") !== false && $deep < 10) {
$text = str_replace(array_keys($this->_holders), array_values($this->_holders), $text);
$deep ++;
}
if ($clearHolders) {
$this->_holders = array();
}
return $text;
}
/**
* @param $type
* @param $value
* @return mixed
*/
public function call($type, $value)
{
if (empty($this->_hooks[$type])) {
return $value;
}
$args = func_get_args();
$args = array_slice($args, 1);
foreach ($this->_hooks[$type] as $callback) {
$value = call_user_func_array($callback, $args);
$args[0] = $value;
}
return $value;
}
/**
* parseInline
*
* @param string $text
* @param string $whiteList
* @param bool $clearHolders
* @param bool $enableAutoLink
* @return string
*/
public function parseInline($text, $whiteList = '', $clearHolders = true, $enableAutoLink = true)
{
$self = $this;
$text = $this->call('beforeParseInline', $text);
// code
$text = preg_replace_callback(
"/(^|[^\\\])(`+)(.+?)\\2/",
function ($matches) use ($self) {
return $matches[1] . $self->makeHolder(
'<code>' . htmlspecialchars($matches[3]) . '</code>'
);
},
$text
);
// mathjax
$text = preg_replace_callback(
"/(^|[^\\\])(\\$+)(.+?)\\2/",
function ($matches) use ($self) {
return $matches[1] . $self->makeHolder(
$matches[2] . htmlspecialchars($matches[3]) . $matches[2]
);
},
$text
);
// escape
$text = preg_replace_callback(
"/\\\(.)/u",
function ($matches) use ($self) {
$escaped = htmlspecialchars($matches[1]);
$escaped = str_replace('$', '$', $escaped);
return $self->makeHolder($escaped);
},
$text
);
// link
$text = preg_replace_callback(
"/<(https?:\/\/.+)>/i",
function ($matches) use ($self) {
$url = $self->cleanUrl($matches[1]);
$link = $self->call('parseLink', $matches[1]);
return $self->makeHolder(
"<a href=\"{$url}\">{$link}</a>"
);
},
$text
);
// encode unsafe tags
$text = preg_replace_callback(
"/<(\/?)([a-z0-9-]+)(\s+[^>]*)?>/i",
function ($matches) use ($self, $whiteList) {
if ($self->_html || false !== stripos(
'|' . $self->_commonWhiteList . '|' . $whiteList . '|', '|' . $matches[2] . '|'
)) {
return $self->makeHolder($matches[0]);
} else {
return htmlspecialchars($matches[0]);
}
},
$text
);
if ($this->_html) {
$text = preg_replace_callback("/<!\-\-(.*?)\-\->/", function ($matches) use ($self) {
return $self->makeHolder($matches[0]);
}, $text);
}
$text = str_replace(array('<', '>'), array('<', '>'), $text);
// footnote
$text = preg_replace_callback(
"/\[\^((?:[^\]]|\\\\\]|\\\\\[)+?)\]/",
function ($matches) use ($self) {
$id = array_search($matches[1], $self->_footnotes);
if (false === $id) {
$id = count($self->_footnotes) + 1;
$self->_footnotes[$id] = $self->parseInline($matches[1], '', false);
}
return $self->makeHolder(
"<sup id=\"fnref-{$id}\"><a href=\"#fn-{$id}\" class=\"footnote-ref\">{$id}</a></sup>"
);
},
$text
);
// image
$text = preg_replace_callback(
"/!\[((?:[^\]]|\\\\\]|\\\\\[)*?)\]\(((?:[^\)]|\\\\\)|\\\\\()+?)\)/",
function ($matches) use ($self) {
$escaped = htmlspecialchars($self->escapeBracket($matches[1]));
$url = $self->escapeBracket($matches[2]);
$url = $self->cleanUrl($url);
return $self->makeHolder(
"<img src=\"{$url}\" alt=\"{$escaped}\" title=\"{$escaped}\">"
);
},
$text
);
$text = preg_replace_callback(
"/!\[((?:[^\]]|\\\\\]|\\\\\[)*?)\]\[((?:[^\]]|\\\\\]|\\\\\[)+?)\]/",
function ($matches) use ($self) {
$escaped = htmlspecialchars($self->escapeBracket($matches[1]));
$result = isset( $self->_definitions[$matches[2]] ) ?
"<img src=\"{$self->_definitions[$matches[2]]}\" alt=\"{$escaped}\" title=\"{$escaped}\">"
: $escaped;
return $self->makeHolder($result);
},
$text
);
// link
$text = preg_replace_callback(
"/\[((?:[^\]]|\\\\\]|\\\\\[)+?)\]\(((?:[^\)]|\\\\\)|\\\\\()+?)\)/",
function ($matches) use ($self) {
$escaped = $self->parseInline(
$self->escapeBracket($matches[1]), '', false, false
);
$url = $self->escapeBracket($matches[2]);
$url = $self->cleanUrl($url);
return $self->makeHolder("<a href=\"{$url}\">{$escaped}</a>");
},
$text
);
$text = preg_replace_callback(
"/\[((?:[^\]]|\\\\\]|\\\\\[)+?)\]\[((?:[^\]]|\\\\\]|\\\\\[)+?)\]/",
function ($matches) use ($self) {
$escaped = $self->parseInline(
$self->escapeBracket($matches[1]), '', false
);
$result = isset( $self->_definitions[$matches[2]] ) ?
"<a href=\"{$self->_definitions[$matches[2]]}\">{$escaped}</a>"
: $escaped;
return $self->makeHolder($result);
},
$text
);
// strong and em and some fuck
$text = $this->parseInlineCallback($text);
$text = preg_replace(
"/<([_a-z0-9-\.\+]+@[^@]+\.[a-z]{2,})>/i",
"<a href=\"mailto:\\1\">\\1</a>",
$text
);
// autolink url
if ($enableAutoLink) {
$text = preg_replace_callback(
"/(^|[^\"])((https?):[\p{L}_0-9-\.\/%#!@\?\+=~\|\,&\(\)]+)($|[^\"])/iu",
function ($matches) use ($self) {
$link = $self->call('parseLink', $matches[2]);
return "{$matches[1]}<a href=\"{$matches[2]}\">{$link}</a>{$matches[4]}";
},
$text
);
}
$text = $this->call('afterParseInlineBeforeRelease', $text);
$text = $this->releaseHolder($text, $clearHolders);
$text = $this->call('afterParseInline', $text);
return $text;
}
/**
* @param $text
* @return mixed
*/
public function parseInlineCallback($text)
{
$self = $this;
$text = preg_replace_callback(
"/(\*{3})(.+?)\\1/",
function ($matches) use ($self) {
return '<strong><em>' .
$self->parseInlineCallback($matches[2]) .
'</em></strong>';
},
$text
);
$text = preg_replace_callback(
"/(\*{2})(.+?)\\1/",
function ($matches) use ($self) {
return '<strong>' .
$self->parseInlineCallback($matches[2]) .
'</strong>';
},
$text
);
$text = preg_replace_callback(
"/(\*)(.+?)\\1/",
function ($matches) use ($self) {
return '<em>' .
$self->parseInlineCallback($matches[2]) .
'</em>';
},
$text
);
$text = preg_replace_callback(
"/(\s+|^)(_{3})(.+?)\\2(\s+|$)/",
function ($matches) use ($self) {
return $matches[1] . '<strong><em>' .
$self->parseInlineCallback($matches[3]) .
'</em></strong>' . $matches[4];
},
$text
);
$text = preg_replace_callback(
"/(\s+|^)(_{2})(.+?)\\2(\s+|$)/",
function ($matches) use ($self) {
return $matches[1] . '<strong>' .
$self->parseInlineCallback($matches[3]) .
'</strong>' . $matches[4];
},
$text
);
$text = preg_replace_callback(
"/(\s+|^)(_)(.+?)\\2(\s+|$)/",
function ($matches) use ($self) {
return $matches[1] . '<em>' .
$self->parseInlineCallback($matches[3]) .
'</em>' . $matches[4];
},
$text
);
$text = preg_replace_callback(
"/(~{2})(.+?)\\1/",
function ($matches) use ($self) {
return '<del>' .
$self->parseInlineCallback($matches[2]) .
'</del>';
},
$text
);
return $text;
}
/**
* parseBlock
*
* @param string $text
* @param array $lines
* @return array
*/
private function parseBlock($text, &$lines)
{
$lines = explode("\n", $text);
$this->_blocks = array();
$this->_current = 'normal';
$this->_pos = -1;
$state = array(
'special' => implode("|", array_keys($this->_specialWhiteList)),
'empty' => 0,
'html' => false
);
// analyze by line
foreach ($lines as $key => $line) {
$block = $this->getBlock();
$args = array($block, $key, $line, &$state, $lines);
if ($this->_current != 'normal') {
$pass = call_user_func_array($this->_parsers[$this->_current], $args);
if (!$pass) {
continue;
}
}
foreach ($this->_parsers as $name => $parser) {
if ($name != $this->_current) {
$pass = call_user_func_array($parser, $args);
if (!$pass) {
break;
}
}
}
}
return $this->optimizeBlocks($this->_blocks, $lines);
}
/**
* @param $block
* @param $key
* @param $line
* @param $state
* @return bool
*/
private function parseBlockList($block, $key, $line, &$state)
{
if (preg_match("/^(\s*)((?:[0-9]+\.)|(?:[a-z]\.?)|\-|\+|\*)\s+/i", $line, $matches)) {
$space = strlen($matches[1]);
$state['empty'] = 0;
// opened
if ($this->isBlock('list')) {
$this->setBlock($key, $space);
} else {
$this->startBlock('list', $key, $space);
}
return false;
} else if ($this->isBlock('list') && !preg_match("/^\s*\[((?:[^\]]|\\]|\\[)+?)\]:\s*(.+)$/", $line)) {
if ($state['empty'] <= 1
&& preg_match("/^(\s+)/", $line, $matches)
&& strlen($matches[1]) > $block[3]) {
$state['empty'] = 0;
$this->setBlock($key);
return false;
} else if (preg_match("/^(\s*)$/", $line) && $state['empty'] == 0) {
$state['empty'] ++;
$this->setBlock($key);
return false;
}
}
return true;
}
/**
* @param $block
* @param $key
* @param $line
* @return bool
*/
private function parseBlockCode($block, $key, $line)
{
if (preg_match("/^(\s*)(~{3,}|`{3,})([^`~]*)$/i", $line, $matches)) {
if ($this->isBlock('code')) {
$isAfterList = $block[3][2];
if ($isAfterList) {
$this->combineBlock()
->setBlock($key);
} else {
$this->setBlock($key)
->endBlock();
}
} else {
$isAfterList = false;
if ($this->isBlock('list')) {
$space = $block[3];
$isAfterList = ($space > 0 && strlen($matches[1]) >= $space)
|| strlen($matches[1]) > $space;
}
$this->startBlock('code', $key, array(
$matches[1], $matches[3], $isAfterList
));
}
return false;
} else if ($this->isBlock('code')) {
$this->setBlock($key);
return false;
}
return true;
}
/**
* @param $block
* @param $key
* @param $line
* @param $state
* @return bool
*/
private function parseBlockShtml($block, $key, $line, &$state)
{
if ($this->_html) {
if (preg_match("/^(\s*)!!!(\s*)$/", $line, $matches)) {
if ($this->isBlock('shtml')) {
$this->setBlock($key)->endBlock();
} else {
$this->startBlock('shtml', $key);
}
return false;
} else if ($this->isBlock('shtml')) {
$this->setBlock($key);
return false;
}
}
return true;
}
/**
* @param $block
* @param $key
* @param $line
* @param $state
* @return bool
*/
private function parseBlockAhtml($block, $key, $line, &$state)
{
if ($this->_html) {
if (preg_match("/^\s*<({$this->_blockHtmlTags})(\s+[^>]*)?>/i", $line, $matches)) {
if ($this->isBlock('ahtml')) {
$this->setBlock($key);
return false;
} else if (empty($matches[2]) || $matches[2] != '/') {
$this->startBlock('ahtml', $key);
preg_match_all("/<({$this->_blockHtmlTags})(\s+[^>]*)?>/i", $line, $allMatches);
$lastMatch = $allMatches[1][count($allMatches[0]) - 1];
if (strpos($line, "</{$lastMatch}>") !== false) {
$this->endBlock();
} else {
$state['html'] = $lastMatch;
}
return false;
}
} else if (!!$state['html'] && strpos($line, "</{$state['html']}>") !== false) {
$this->setBlock($key)->endBlock();
$state['html'] = false;
return false;
} else if ($this->isBlock('ahtml')) {
$this->setBlock($key);
return false;
} else if (preg_match("/^\s*<!\-\-(.*?)\-\->\s*$/", $line, $matches)) {
$this->startBlock('ahtml', $key)->endBlock();
return false;
}
}
return true;
}
/**
* @param $block
* @param $key
* @param $line
* @return bool
*/
private function parseBlockMath($block, $key, $line)
{
if (preg_match("/^(\s*)\\$\\$(\s*)$/", $line, $matches)) {
if ($this->isBlock('math')) {
$this->setBlock($key)->endBlock();
} else {
$this->startBlock('math', $key);
}
return false;
} else if ($this->isBlock('math')) {
$this->setBlock($key);
return false;
}
return true;
}
/**
* @param $block
* @param $key
* @param $line
* @param $state
* @return bool
*/
private function parseBlockPre($block, $key, $line, &$state)
{
if (preg_match("/^ {4}/", $line)) {
if ($this->isBlock('pre')) {
$this->setBlock($key);
} else {
$this->startBlock('pre', $key);
}
return false;
} else if ($this->isBlock('pre') && preg_match("/^\s*$/", $line)) {
$this->setBlock($key);
return false;
}
return true;
}
/**
* @param $block
* @param $key
* @param $line
* @param $state
* @return bool
*/
private function parseBlockHtml($block, $key, $line, &$state)
{
if (preg_match("/^\s*<({$state['special']})(\s+[^>]*)?>/i", $line, $matches)) {
$tag = strtolower($matches[1]);
if (!$this->isBlock('html', $tag) && !$this->isBlock('pre')) {
$this->startBlock('html', $key, $tag);
}
return false;
} else if (preg_match("/<\/({$state['special']})>\s*$/i", $line, $matches)) {
$tag = strtolower($matches[1]);
if ($this->isBlock('html', $tag)) {
$this->setBlock($key)
->endBlock();
}
return false;
} else if ($this->isBlock('html')) {
$this->setBlock($key);
return false;
}
return true;
}
/**
* @param $block
* @param $key
* @param $line
* @return bool
*/
private function parseBlockFootnote($block, $key, $line)
{
if (preg_match("/^\[\^((?:[^\]]|\\]|\\[)+?)\]:/", $line, $matches)) {
$space = strlen($matches[0]) - 1;
$this->startBlock('footnote', $key, array(
$space, $matches[1]
));
return false;
}
return true;
}
/**
* @param $block
* @param $key
* @param $line
* @return bool
*/
private function parseBlockDefinition($block, $key, $line)
{
if (preg_match("/^\s*\[((?:[^\]]|\\]|\\[)+?)\]:\s*(.+)$/", $line, $matches)) {
$this->_definitions[$matches[1]] = $this->cleanUrl($matches[2]);
$this->startBlock('definition', $key)
->endBlock();
return false;
}
return true;
}
/**
* @param $block
* @param $key
* @param $line
* @return bool
*/
private function parseBlockQuote($block, $key, $line)
{
if (preg_match("/^(\s*)>/", $line, $matches)) {
if ($this->isBlock('list') && strlen($matches[1]) > 0) {
$this->setBlock($key);
} else if ($this->isBlock('quote')) {
$this->setBlock($key);
} else {
$this->startBlock('quote', $key);
}
return false;
}
return true;
}
/**
* @param $block
* @param $key
* @param $line
* @param $state
* @param $lines
* @return bool
*/
private function parseBlockTable($block, $key, $line, &$state, $lines)
{
if (preg_match("/^((?:(?:(?:\||\+)(?:[ :]*\-+[ :]*)(?:\||\+))|(?:(?:[ :]*\-+[ :]*)(?:\||\+)(?:[ :]*\-+[ :]*))|(?:(?:[ :]*\-+[ :]*)(?:\||\+))|(?:(?:\||\+)(?:[ :]*\-+[ :]*)))+)$/", $line, $matches)) {
if ($this->isBlock('table')) {
$block[3][0][] = $block[3][2];
$block[3][2]++;
$this->setBlock($key, $block[3]);
} else {
$head = 0;
if (empty($block) ||
$block[0] != 'normal' ||
preg_match("/^\s*$/", $lines[$block[2]])) {
$this->startBlock('table', $key);
} else {
$head = 1;
$this->backBlock(1, 'table');
}
if ($matches[1][0] == '|') {
$matches[1] = substr($matches[1], 1);
if ($matches[1][strlen($matches[1]) - 1] == '|') {
$matches[1] = substr($matches[1], 0, -1);
}
}
$rows = preg_split("/(\+|\|)/", $matches[1]);
$aligns = array();
foreach ($rows as $row) {
$align = 'none';
if (preg_match("/^\s*(:?)\-+(:?)\s*$/", $row, $matches)) {
if (!empty($matches[1]) && !empty($matches[2])) {
$align = 'center';
} else if (!empty($matches[1])) {
$align = 'left';
} else if (!empty($matches[2])) {
$align = 'right';
}
}
$aligns[] = $align;
}
$this->setBlock($key, array(array($head), $aligns, $head + 1));
}
return false;
}
return true;
}
/**
* @param $block
* @param $key
* @param $line
* @return bool
*/
private function parseBlockSh($block, $key, $line)
{
if (preg_match("/^(#+)(.*)$/", $line, $matches)) {
$num = min(strlen($matches[1]), 6);
$this->startBlock('sh', $key, $num)
->endBlock();
return false;
}
return true;
}
/**
* @param $block
* @param $key
* @param $line
* @param $state
* @param $lines
* @return bool
*/
private function parseBlockMh($block, $key, $line, &$state, $lines)
{
if (preg_match("/^\s*((=|-){2,})\s*$/", $line, $matches)