code: private void push( char c ) {
        if( this.top >= MAXDEPTH ){
           throw new JSONException( "Nesting too deep." );
        }
        this.stack[this.top] = c;
        this.mode = c;
        this.top += 1;
     }
docs: Push an array or object scope.
  
  @param c The scope to open.
  @throws JSONException If nesting is too deep.