.
*/
if (!class_exists("bbLaTeX")) {
class bbLaTeX {
function bbLaTeX() { //constructor
}
function init() {
$this->getAdminOptions();
}
//Returns an array of admin options
function getAdminOptions() {
$mThemeName = bb_get_option('bb_active_theme') ;
$mOptions = "bbLaTeX" . $mThemeName ;
$bbLaTeXAdminOptions =
array(
'cache' => dirname(__FILE__) . '/cache/',
'cacheurl' => rtrim(bb_get_option('uri'),"/") . '/' . basename(BB_PLUGIN_DIR) . '/cache/',
'latexserver' => 'http://l.wordpress.com/latex.php',
'imagefmt' => 'png',
'text_colour' => '000000',
'bg_colour' => 'FFFFFF',
'transparent' => '1',
'tag' => 'latex',
'size' => '0') ;
$bbLaTeXOptions = bb_get_option($mOptions);
if (!empty($bbLaTeXOptions)) {
foreach ($bbLaTeXOptions as $key => $option)
if ($option) { // blank option means use default
$bbLaTeXAdminOptions[$key] = stripslashes($option);
}
}
bb_update_option($mOptions, $bbLaTeXAdminOptions);
return $bbLaTeXAdminOptions;
}
function saveTex ($toParse)
{
// save math code inside tags.
// other filters should be told to ignore text between these tags.
$bbLaTeXOptions = $this->getAdminOptions();
$tag = $bbLaTeXOptions['tag'] ;
$regex = '#\[math\] *(.*?)\[/math\]#si';
if ($tag == 'tex') $regex = '#\$\$(.*?)\$\$#si';
if ($tag == 'latex') $regex = '#\\\\\[(.*?)\\\\\]#si';
return preg_replace($regex, '$1', $toParse);
}
function parseTex ($toParse)
{
$regex = '#(.*?)#si';
return preg_replace_callback($regex, array(&$this, 'createTex'), $toParse);
}
function createTex($toTex)
{
$formula_text = $toTex[1];
$imgtext=false;
if (substr($formula_text, -1, 1) == "!")
return "$$".substr($formula_text, 0, -1)."$$";
if (substr($formula_text, 0, 1) == "!") {
$imgtext=true;
$formula_text=substr($formula_text, 1);
}
$bbLaTeXOptions = $this->getAdminOptions();
$formula_hash = md5($formula_text .
$bbLaTeXOptions['bg_colour'] .
$bbLaTeXOptions['text_colour'] .
$bbLaTeXOptions['size'] .
$bbLaTeXOptiona['transparent']);
$formula_filename = 'tex_' . $formula_hash . '.' . $bbLaTeXOptions['imagefmt'];
$cache_formula_path = rtrim($bbLaTeXOptions['cache'], "/") . '/' . $formula_filename;
$cache_formula_url = rtrim($bbLaTeXOptions['cacheurl'], "/") . '/' . $formula_filename;
if ( !is_file($cache_formula_path))
{
if ( !is_writable($bbLaTeXOptions['cache']))
{
return '$$' . $formula_text . '$$' ;
}
$formula_url = $bbLaTeXOptions['latexserver'] . '?latex=' . rawurlencode(html_entity_decode($formula_text)) .
'&bg=' . $bbLaTeXOptions['bg_colour'] .
'&fg=' . $bbLaTeXOptions['text_colour'] .
'&s=' . $bbLaTeXOptions['size'];
$formula_image = imagecreatefrompng($formula_url);
if ($bbLaTeXOptions['transparent'])
{
// $colour = imagecolorallocate($formula_image, hexdec('0x' . $bgColour{0} . $bgColour{1}), hexdec('0x' . $bgColour{2} . $bgColour{3}), hexdec('0x' . $bgColour{4} . $bgColour{5}));
$colour = imagecolorat($formula_image, 1,1);
imagecolortransparent($formula_image, $colour);
}
imagepng($formula_image, $cache_formula_path, 9);
}
$formula_output = '
' ;
// returning the image-tag, referring to the image in your cache folder
if($imgtext) return '' . $formula_output . '' ;
return $formula_output ;
}
}
} //End Class bbLaTeX
if (class_exists("bbLaTeX")) {
$bb_LaTeX = new bbLaTeX();
if (isset($bb_LaTeX)) {
add_filter('pre_post', array($bb_LaTeX, 'saveTex'), 50);
add_filter('post_text', array($bb_LaTeX, 'parseTex'), 52);
add_action('bb_admin_menu_generator', 'bbLaTeX_admin_page_add');
add_filter('get_allowed_markup', 'bbLaTeX_allowed_markup', 2);
add_filter('bb_allowed_tags', 'bbLaTeX_allow_tag');
}
function bbLaTeX_allow_tag( $tags ) {
$tags['bblatex'] = array();
return $tags;
}
function bbLaTeX_allowed_markup ($previous = '') {
global $bb_LaTeX;
// Remove bblatex from list of _displayed_ allowed tags
$premarkup = preg_replace('/bblatex/', '', $previous);
if ($previous) $premarkup = $premarkup . '
';
$bbLaTeXOptions = $bb_LaTeX->getAdminOptions();
$tag = $bbLaTeXOptions['tag'] ;
$style = '[math]x^2 + y^2 = 1[/math]';
if ($tag == 'tex') $style = '$$x^2 + y^2 = 1$$';
if ($tag == 'latex') $style = '\[x^2 + y^2 = 1\]';
return $premarkup . 'Uses bbLaTeX. Write LaTeX syntax as ' . $style;
}
function bbLaTeX_admin_page_add() {
bb_admin_add_submenu(__('bbLaTeX Configuration'), 'use_keys', 'bbLaTeXprintAdminPage');
}
//Prints out the admin page
function bbLaTeXprintAdminPage() {
global $bb_LaTeX;
$mThemeName = bb_get_option('bb_active_theme') ;
$mOptions = "bbLaTeX" . $mThemeName ;
$bbLaTeXOptions = $bb_LaTeX->getAdminOptions();
if (isset($_POST['bbLaTeX_create_cache'])) {
if (!@mkdir($bbLaTeXOptions['cache'],0755))
{
?>
getAdminOptions();
?>
';
} else {
if (! is_writable($bbLaTeXOptions['cache'])) {
$cache_error_msg .= 'I can\'t write to it.
';
}
if (! is_readable($bbLaTeXOptions['cache'])) {
$cache_error_msg .= 'I can\'t read from it.
';
}
}
?>