48 lines
1.7 KiB
C#
48 lines
1.7 KiB
C#
using CSMic;
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namespace CSMic.StandardLibrary.Functions
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{
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/// <summary> A function that returns <c>1</c> if the expression is positive and <c>-1</c> if it is negative. </summary>
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public class Sign : FunctionBase, ICodedFunction
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{
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/// <summary> (Immutable) The return value representing "positive". </summary>
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private const decimal POSITIVE = 1;
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/// <summary> (Immutable) The return value representing "negative". </summary>
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private const decimal NEGATIVE = -1;
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/// <summary> Gets the name of the function. </summary>
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/// <value> sign. </value>
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public string Name
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{
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get
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{
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return "sign";
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}
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}
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/// <summary> Gets the expected arguments. </summary>
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/// <value> The expected arguments. </value>
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public override IEnumerable<FunctionArgument> ExpectedArguments
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{
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get
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{
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yield return new FunctionArgument("value", FunctionValue.NUMBER);
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}
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}
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/// <summary> Executes the function with the given arguments. </summary>
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/// <param name="args"> A variable-length parameters list containing arguments. </param>
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/// <returns> A <see cref="FunctionValue"/> representing the result of the function execution. </returns>
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public FunctionValue Execute(params FunctionArgument[] args)
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{
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return base.Execute(args, (_args) =>
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{
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var input = _args[0].Value;
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decimal number = Convert.ToDecimal(input.Value);
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return new FunctionValue(FunctionValueType.Numeric, number >= 0 ? POSITIVE : NEGATIVE);
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});
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}
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}
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}
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