code: void setArrayExpression(BSHArrayInitializer init) {
          this.isArrayExpression = true;
          if (parent instanceof BSHAssignment) {
              BSHAssignment ass = (BSHAssignment) parent;
              if ( null != ass.operator
                      && ass.operator == ParserConstants.ASSIGN )
                  this.isMapExpression = true;
              if ( this.isMapExpression
                  && init.jjtGetParent() instanceof BSHArrayInitializer )
              init.setMapInArray(true);
          }
      }
docs: Called from BSHArrayInitializer during node creation informing us
  that we are an array expression.
  If parent BSHAssignment has an ASSIGN operation then this is a map
  expression. If the initializer reference has multiple dimensions
  it gets configure as being a map in array.
  @param init reference to the calling array initializer