func (exec Execute) resolveBothExpressions(n ast.DoubleTermNode) (left, right interface{}) {
lt := n.LeftTerm()
rt := n.RightTerm()
left = exec.resolveExpression(lt)
right = exec.resolveExpression(rt)
return left, right
}
func (exec Execute) resolveBothStringNodes(n ast.DoubleTermNode) (left,
right string) {
lt := n.LeftTerm()
rt := n.RightTerm()
left = exec.resolveStringNode(lt)
right = exec.resolveStringNode(rt)
return left, right
}
func (exec Execute) resolveBothMathNodes(n ast.DoubleTermNode) (left,
right float32) {
lt := n.LeftTerm()
rt := n.RightTerm()
left = exec.resolveMathNode(lt)
right = exec.resolveMathNode(rt)
return left, right
}