    /** @protected */
    protected _evaluate(meta: IJtIfMeta, a: number, b: number, data?: any): string
    {
        let raw = meta.lval;
        
        a = raw.indexOf('(', a) + 1; // if -> ( ...

        const edheader  = ')' + meta.hcfg.ed;
        const posheader = raw.indexOf(edheader, a);

        const condition = meta.act.bind