コード例 #1
0
        public AST Apply(Token operata, AST op1, AST op2)
        {
            op1 = this.Convert(op1);
            if (!operata.Is(TokenType.FULL_STOP))
            {
                op2 = this.Convert(op2);
            }

            switch (operata.Type)
            {
            case TokenType.TIMES:
                return(new Tree.Number((op1.Evaluate(this.env).Value *op2.Evaluate(this.env).Value).ToString()));

            case TokenType.DIVIDE:
                return(new Tree.Number((op1.Evaluate(this.env).Value / op2.Evaluate(this.env).Value).ToString()));

            case TokenType.PLUS:
                return(this.ApplyPLUS(operata, op1, op2));

            case TokenType.MINUS:
                return(new Tree.Number((op1.Evaluate(this.env).Value - op2.Evaluate(this.env).Value).ToString()));

            case TokenType.MODULUS:
                return(new Tree.Number((op1.Evaluate(this.env).Value % op2.Evaluate(this.env).Value).ToString()));

            case TokenType.EQUAL_TO:
                return(new Tree.Boolean((op1.Evaluate(this.env).Value == op2.Evaluate(this.env).Value).ToString()));

            case TokenType.NOT_EQUAL_TO:
                return(new Tree.Boolean((op1.Evaluate(this.env).Value != op2.Evaluate(this.env).Value).ToString()));

            case TokenType.LESS_THAN:
                return(new Tree.Boolean((op1.Evaluate(this.env).Value < op2.Evaluate(this.env).Value).ToString()));

            case TokenType.LESS_THAN_OR_EQUAL_TO:
                return(new Tree.Boolean((op1.Evaluate(this.env).Value <= op2.Evaluate(this.env).Value).ToString()));

            case TokenType.GREATER_THAN:
                return(new Tree.Boolean((op1.Evaluate(this.env).Value > op2.Evaluate(this.env).Value).ToString()));

            case TokenType.GREATER_THAN_OR_EQUAL_TO:
                return(new Tree.Boolean((op1.Evaluate(env).Value >= op2.Evaluate(env).Value).ToString()));

            case TokenType.LOGICAL_AND:
                var op1Res = op1.Evaluate(this.env).Value;
                var op2Res = op2.Evaluate(this.env).Value;
                return(new Tree.Boolean((op1Res && op2Res).ToString()));

            case TokenType.LOGICAL_OR:
                var operationOneRes = op1.Evaluate(this.env).Value;
                var operationTwoRes = op2.Evaluate(this.env).Value;
                return(new Tree.Boolean((operationOneRes || operationTwoRes).ToString()));

            case TokenType.FULL_STOP:
                return(this.AccessModifier(op1, op2));

            default:
                this.Error(operata.Type + " cannot be used as an expression operator", operata.Row, operata.Column);
                return(null);
            }
        }
コード例 #2
0
 /*
  *  Helper functions
  */
 private bool checkType(AST oparand, TreeType type)
 {
     return(oparand.Type == type);
 }
コード例 #3
0
 public Assignment(string left, AST right) : base(TreeType.ASSIGNMENT)
 {
     this.right = right;
     this.left  = left;
 }