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48 lines
1.3 KiB
48 lines
1.3 KiB
2 years ago
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using EC.Helper.RabbitFunc.Runtime;
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namespace EC.Helper.RabbitFunc.Expressions;
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public class UnaryExpression : Expression
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{
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internal UnaryExpression(ExpressionType type, Expression operand)
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: base(type)
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{
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Operand = operand;
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}
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public Expression Operand { get; }
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public override object Eval(RuntimeContext context)
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{
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if (context == null)
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throw new ArgumentNullException(nameof(context));
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object value = Operand.Eval(context);
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switch (NodeType)
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{
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case ExpressionType.Negate:
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return (-(double)value);
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case ExpressionType.Not:
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return (!(bool)value);
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default:
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throw new RuntimeException("unknown unary:" + NodeType.ToString());
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}
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}
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public override string ToString()
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{
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switch (NodeType)
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{
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case ExpressionType.Negate:
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return Operand is BinaryExpression ? "-(" + Operand.ToString() + ")" : "-" + Operand.ToString();
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case ExpressionType.Not:
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return Operand is BinaryExpression ? "!(" + Operand.ToString() + ")" : "!" + Operand.ToString();
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default:
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throw new RuntimeException("unknown operator:" + NodeType.ToString());
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}
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}
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}
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