49 lines
1.6 KiB
C#
49 lines
1.6 KiB
C#
using System;
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namespace VAR.ExpressionEvaluator
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{
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public class ExpressionGreaterThanNode : ExpressionBinaryNode
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{
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public ExpressionGreaterThanNode(IExpressionNode leftNode, IExpressionNode rightNode) :
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base(leftNode, rightNode, GreaterThanOp)
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{
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}
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private static object GreaterThanOp(object leftValue, object rightValue)
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{
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if (leftValue == null || rightValue == null)
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{
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return false;
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}
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if (leftValue is string && rightValue is string)
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{
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return string.Compare((string)leftValue, (string)rightValue) > 0;
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}
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if (leftValue is string)
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{
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if (decimal.TryParse((string)leftValue, out decimal dec) == false)
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{
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throw new Exception(string.Format("Can't convert to decimal string value \"{0}\"", (string)leftValue));
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}
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leftValue = dec;
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}
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if (rightValue is string)
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{
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if (decimal.TryParse((string)rightValue, out decimal dec) == false)
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{
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throw new Exception(string.Format("Can't convert to decimal string value \"{0}\"", (string)rightValue));
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}
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rightValue = dec;
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}
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if ((leftValue is decimal) == false || (rightValue is decimal) == false)
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{
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throw new Exception("Can't compare non decimal values");
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}
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return (decimal)leftValue > (decimal)rightValue;
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}
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}
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}
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