func NewArithExpr(opTypeStr string, lhs ast.Node, rhs ast.Node) (ast.Node, error) {
var opTypes = map[string]ast.BinOpType{
"+": ast.ADD,
"-": ast.SUB,
"*": ast.MUL,
"/": ast.DIV,
"%": ast.MOD,
">": ast.GT,
"<": ast.LT,
"==": ast.EQ,
"!=": ast.NE,
">=": ast.GE,
"<=": ast.LE,
"AND": ast.AND,
"OR": ast.OR,
}
opType, ok := opTypes[opTypeStr]
if !ok {
return nil, fmt.Errorf("Invalid binary operator \"%v\"", opTypeStr)
}
expr, err := ast.NewArithExpr(opType, lhs, rhs)
if err != nil {
return nil, fmt.Errorf(err.Error())
}
return expr, nil
}
// NewArithExpr is a convenience function to create a new AST arithmetic expression.
func NewArithExpr(opTypeStr string, lhs ast.Node, rhs ast.Node) (ast.Node, error) {
var opTypes = map[string]ast.BinOpType{
"+": ast.Add,
"-": ast.Sub,
"*": ast.Mul,
"/": ast.Div,
"%": ast.Mod,
">": ast.GT,
"<": ast.LT,
"==": ast.EQ,
"!=": ast.NE,
">=": ast.GE,
"<=": ast.LE,
"AND": ast.And,
"OR": ast.Or,
}
opType, ok := opTypes[opTypeStr]
if !ok {
return nil, fmt.Errorf("invalid binary operator %q", opTypeStr)
}
expr, err := ast.NewArithExpr(opType, lhs, rhs)
if err != nil {
return nil, fmt.Errorf(err.Error())
}
return expr, nil
}