constructor(utils) {
        this.utils = utils;
        this.parsers = new Map();
        this.defaultHeight = "230px";
        this.defaultBackgroundColor = "#F8F8F8";
        this.regexp = /^\/\/{height:"(?<height>.*?)",width:"(?<width>.*?)"}/;
    }
Dynamically register and unregister third-party code block diagram (derived from DiagramParser).