Function evalMathTree

query/math.go:250–304

(mNode *mathTree)

}

func evalMathTree(mNode *mathTree) error {
	if mNode.Const.Value != nil {
		return nil
	}
	if mNode.Var != "" {
		if mNode.Val.IsEmpty() {
			glog.V(2).Infof("Variable %v not yet populated or missing.", mNode.Var)
		}
		// This is a leaf node whose value is already populated. So return.
		return nil
	}

	for _, child := range mNode.Child {
		// Process the child nodes first.
		if err := evalMathTree(child); err != nil {
			return err
		}
	}

	aggName := mNode.Fn

	if isUnary(aggName) {
		if len(mNode.Child) != 1 {
			return errors.Errorf("Function %v expects 1 argument. But got: %v", aggName,
				len(mNode.Child))
		}
		return processUnary(mNode)
	}

	if isBinary(aggName) {
		if len(mNode.Child) != 2 {
			return errors.Errorf("Function %v expects 2 argument. But got: %v", aggName,
				len(mNode.Child))
		}
		return processBinary(mNode)
	}

	if isBinaryBoolean(aggName) {
		if len(mNode.Child) != 2 {
			return errors.Errorf("Function %v expects 2 argument. But got: %v", aggName,
				len(mNode.Child))
		}
		return processBinaryBoolean(mNode)
	}

	if isTernary(aggName) {
		if len(mNode.Child) != 3 {
			return errors.Errorf("Function %v expects 3 argument. But got: %v", aggName,
				len(mNode.Child))
		}
		return processTernary(mNode)
	}

	return errors.Errorf("Unhandled Math operator: %v", aggName)
}