customcode.php

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<?php
class RMCustomCode
{
    private $custom_codes = array();

    static function get(){
        static $instance;

        if (isset($instance))
            return $instance;

        $instance = new RMCustomCode();
        return $instance;
    }

    function add($tag, $func) {

        if ( is_callable($func) )
            $this->custom_codes[$tag] = $func;

    }

    function remove($tag) {

        unset($this->custom_codes[$tag]);
    }

    function removeAll() {

        $this->custom_codes = array();

    }

    function doCode($content) {

        if (empty($this->custom_codes) || !is_array($this->custom_codes))
            return $content;

        $pattern = $this->getRegex();
        return preg_replace_callback( "/$pattern/s", array($this, 'doTag'), $content );
    }

    function getRegex() {

        $tagnames = array_keys($this->custom_codes);
        $tagregexp = join( '|', array_map('preg_quote', $tagnames) );

        // WARNING! Do not change this regex without changing do_customcode_tag() and strip_customcode_tag()
        // Also, see customcode_unautop() and customcode.js.
        return
            '\\['                              // Opening bracket
            . '(\\[?)'                           // 1: Optional second opening bracket for escaping customcodes: [[tag]]
            . "($tagregexp)"                     // 2: customcode name
            . '(?![\\w-])'                       // Not followed by word character or hyphen
            . '('                                // 3: Unroll the loop: Inside the opening customcode tag
            .     '[^\\]\\/]*'                   // Not a closing bracket or forward slash
            .     '(?:'
            .         '\\/(?!\\])'               // A forward slash not followed by a closing bracket
            .         '[^\\]\\/]*'               // Not a closing bracket or forward slash
            .     ')*?'
            . ')'
            . '(?:'
            .     '(\\/)'                        // 4: Self closing tag ...
            .     '\\]'                          // ... and closing bracket
            . '|'
            .     '\\]'                          // Closing bracket
            .     '(?:'
            .         '('                        // 5: Unroll the loop: Optionally, anything between the opening and closing customcode tags
            .             '[^\\[]*+'             // Not an opening bracket
            .             '(?:'
            .                 '\\[(?!\\/\\2\\])' // An opening bracket not followed by the closing customcode tag
            .                 '[^\\[]*+'         // Not an opening bracket
            .             ')*+'
            .         ')'
            .         '\\[\\/\\2\\]'             // Closing customcode tag
            .     ')?'
            . ')'
            . '(\\]?)';                          // 6: Optional second closing brocket for escaping customcodes: [[tag]]
    }

    function doTag( $m ) {

        // allow [[foo]] syntax for escaping a tag
        if ( $m[1] == '[' && $m[6] == ']' ) {
            return substr($m[0], 1, -1);
        }

        $tag = $m[2];
        $attr = $this->parseAtts( $m[3] );

        if ( isset( $m[5] ) ) {
            // enclosing tag - extra parameter
            return $m[1] . call_user_func( $this->custom_codes[$tag], $attr, $m[5], $tag ) . $m[6];
        } else {
            // self-closing tag
            return $m[1] . call_user_func( $this->custom_codes[$tag], $attr, null,  $tag ) . $m[6];
        }
    }

    function parseAtts($text) {
        $atts = array();
        $pattern = '/(\w+)\s*=\s*"([^"]*)"(?:\s|$)|(\w+)\s*=\s*\'([^\']*)\'(?:\s|$)|(\w+)\s*=\s*([^\s\'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|(\S+)(?:\s|$)/';
        $text = preg_replace("/[\x{00a0}\x{200b}]+/u", " ", $text);
        if ( preg_match_all($pattern, $text, $match, PREG_SET_ORDER) ) {
            foreach ($match as $m) {
                if (!empty($m[1]))
                    $atts[strtolower($m[1])] = stripcslashes($m[2]);
                elseif (!empty($m[3]))
                    $atts[strtolower($m[3])] = stripcslashes($m[4]);
                elseif (!empty($m[5]))
                    $atts[strtolower($m[5])] = stripcslashes($m[6]);
                elseif (isset($m[7]) and strlen($m[7]))
                    $atts[] = stripcslashes($m[7]);
                elseif (isset($m[8]))
                    $atts[] = stripcslashes($m[8]);
            }
        } else {
            $atts = ltrim($text);
        }
        return $atts;
    }

    function atts($pairs, $atts) {
        $atts = (array)$atts;
        $out = array();
        foreach($pairs as $name => $default) {
            if ( array_key_exists($name, $atts) )
                $out[$name] = $atts[$name];
            else
                $out[$name] = $default;
        }
        return $out;
    }

    function strip( $content ) {

        if (empty($this->custom_codes) || !is_array($this->custom_codes))
            return $content;

        $pattern = $this->getRegex();

        return preg_replace_callback( "/$pattern/s", array($this, 'strip'), $content );
    }

    function stripTag( $m ) {
        // allow [[foo]] syntax for escaping a tag
        if ( $m[1] == '[' && $m[6] == ']' ) {
            return substr($m[0], 1, -1);
        }

        return $m[1] . $m[6];
    }

}