/**
* Helper function for parsing the attributes of GeSHi code tags.
*
* Get the settings for language, line numbers, etc.
*
* @param string $attributes
* String with the attributes.
*
* @return array of settings with fields 'language', 'line_numbering',
* 'linenumbers_start' and 'title'.
*/
public function parseAttributes($attributes)
{
// Initial values.
$lang = NULL;
$line_numbering = NULL;
$linenumbers_start = NULL;
$title = NULL;
// Get the possible tags and languages.
list($generic_code_tags, $language_tags, $tag_to_lang) = $this->getTags();
$language_attributes = GeshiFilter::whitespaceExplode(GeshiFilter::ATTRIBUTES_LANGUAGE);
$attributes_preg_string = implode('|', array_merge($language_attributes, array(GeshiFilter::ATTRIBUTE_LINE_NUMBERING, GeshiFilter::ATTRIBUTE_LINE_NUMBERING_START, GeshiFilter::ATTRIBUTE_FANCY_N, GeshiFilter::ATTRIBUTE_TITLE)));
$enabled_languages = GeshiFilter::getEnabledLanguages();
// Parse $attributes to an array $attribute_matches with:
// $attribute_matches[0][xx] fully matched string, e.g. 'language="python"'
// $attribute_matches[1][xx] param name, e.g. 'language'
// $attribute_matches[2][xx] param value, e.g. 'python'.
preg_match_all('#(' . $attributes_preg_string . ')="?([^"]*)"?#', $attributes, $attribute_matches);
foreach ($attribute_matches[1] as $a_key => $att_name) {
// Get attribute value.
$att_value = $attribute_matches[2][$a_key];
// Check for the language attributes.
if (in_array($att_name, $language_attributes)) {
// Try first to map the attribute value to geshi language code.
if (in_array($att_value, $language_tags)) {
$att_value = $tag_to_lang[$att_value];
}
// Set language if extracted language is an enabled language.
if (array_key_exists($att_value, $enabled_languages)) {
$lang = $att_value;
}
} elseif ($att_name == GeshiFilter::ATTRIBUTE_LINE_NUMBERING) {
switch (strtolower($att_value)) {
case "off":
$line_numbering = 0;
break;
case "normal":
$line_numbering = 1;
break;
case "fancy":
$line_numbering = 5;
break;
}
} elseif ($att_name == GeshiFilter::ATTRIBUTE_FANCY_N) {
$att_value = (int) $att_value;
if ($att_value >= 2) {
$line_numbering = $att_value;
}
} elseif ($att_name == GeshiFilter::ATTRIBUTE_LINE_NUMBERING_START) {
if ($line_numbering < 1) {
$line_numbering = 1;
}
$linenumbers_start = (int) $att_value;
} elseif ($att_name == GeshiFilter::ATTRIBUTE_TITLE) {
$title = $att_value;
}
}
// Return parsed results.
return array('language' => $lang, 'line_numbering' => $line_numbering, 'linenumbers_start' => $linenumbers_start, 'title' => $title);
}
