/**
* Check for the availability of the function in the `utf8_strlen` property
* (initially `mb_strlen`). If the function is not available, create a
* function that will loosely count the number of UTF-8 characters with a
* regular expression.
*/
public function init()
{
if (!function_exists($this->utf8_strlen)) {
$this->utf8_strlen = create_function('$text', 'return preg_match_all(
"/[\\\\x00-\\\\xBF]|[\\\\xC0-\\\\xFF][\\\\x80-\\\\xBF]*/",
$text, $m);');
}
Kernel::setConfig('utf8_strlen', $this->utf8_strlen);
}
/**
* Prepare all required arrays
*/
public function _setup()
{
Kernel::setConfig('footnotes', array());
Kernel::setConfig('glossaries', array());
Kernel::setConfig('bibliographies', array());
self::$notes_ordered = array();
self::$written_notes = array();
self::$footnote_counter = 1;
self::$notes_counter = 0;
}
private function _clearHashes()
{
Kernel::setConfig('html_hashes', array());
Kernel::setConfig('cross_references', array());
Kernel::setConfig('urls', Kernel::getConfig('predefined_urls', array()));
Kernel::setConfig('titles', Kernel::getConfig('predefined_titles', array()));
Kernel::setConfig('attributes', Kernel::getConfig('predefined_attributes', array()));
Kernel::setConfig('predefined_abbr', Kernel::getConfig('predefined_abbr', array()));
}
/**
* Turn Markdown link shortcuts into XHTML <a> tags.
*
* @param string $text
* @return string
*/
public function transform($text)
{
if (Kernel::getConfig('in_anchor') === true) {
return $text;
}
Kernel::setConfig('in_anchor', true);
// First, handle reference-style links: [link text] [id]
$text = preg_replace_callback('{
( # wrap whole match in $1
\\[
(' . Kernel::getConfig('nested_brackets_re') . ') # link text = $2
\\]
[ ]? # one optional space
(?:\\n[ ]*)? # one optional newline followed by spaces
\\[
(.*?) # id = $3
\\]
)
}xs', array($this, '_reference_callback'), $text);
// Next, inline-style links: [link text](url "optional title")
$text = preg_replace_callback('{
( # wrap whole match in $1
\\[
(' . Kernel::getConfig('nested_brackets_re') . ') # link text = $2
\\]
\\( # literal paren
[ \\n]*
(?:
<(.+?)> # href = $3
|
(' . Kernel::getConfig('nested_parenthesis_re') . ') # href = $4
)
[ \\n]*
( # $5
([\'"]) # quote char = $6
(.*?) # Title = $7
\\6 # matching quote
[ \\n]* # ignore any spaces/tabs between closing quote and )
)? # title is optional
\\)
)
}xs', array($this, '_inline_callback'), $text);
// Last, handle reference-style shortcuts: [link text]
// These must come last in case you've also got [link text][1]
// or [link text](/foo)
$text = preg_replace_callback('{
( # wrap whole match in $1
\\[
([^\\[\\]]+) # link text = $2; can\'t contain [ or ]
\\]
)
}xs', array($this, '_reference_callback'), $text);
Kernel::setConfig('in_anchor', false);
return $text;
}
/**
* Build meta data strings
*/
public function append($text)
{
$metadata = Kernel::getConfig('metadata');
if (!empty($metadata)) {
foreach ($metadata as $meta_name => $meta_value) {
if (!empty($meta_name) && is_string($meta_name)) {
if (in_array($meta_name, $this->special_metadata)) {
Kernel::setConfig($meta_name, $meta_value);
} elseif ($meta_name == 'title') {
Kernel::get(Kernel::TYPE_CONTENT)->setTitle($meta_value);
}
}
}
}
return $text;
}
/**
* Reset masks created by the `_setup()` method
*/
public function _teardown()
{
Kernel::setConfig('abbr_desciptions', array());
Kernel::setConfig('abbr_word_re', '');
}
