77 lines
2.4 KiB
C#
77 lines
2.4 KiB
C#
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using Flee.PublicTypes;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace Convention.RScript.Parser
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{
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public static class ExpressionExtension
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{
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public const double DefaultDoubleAccuracy = 1e-7;
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public static bool IsClose(this double value1, double value2, double maximumAbsoluteError = DefaultDoubleAccuracy)
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{
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if (double.IsInfinity(value1) || double.IsInfinity(value2))
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{
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return Equals(value1, value2);
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}
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if (double.IsNaN(value1) || double.IsNaN(value2))
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{
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return false;
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}
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var delta = value1 - value2;
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return !(delta > maximumAbsoluteError || delta < -maximumAbsoluteError);
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}
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public static bool IsCloseToZero(this double value, double maximumAbsoluteError = DefaultDoubleAccuracy)
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{
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return !(double.IsInfinity(value) || double.IsNaN(value) || value > maximumAbsoluteError || value < -maximumAbsoluteError);
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}
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}
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public class ExpressionParser
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{
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public readonly ExpressionContext context;
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public ExpressionParser(ExpressionContext context)
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{
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this.context = context;
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}
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private readonly Dictionary<string, IExpression> CompileGenericExpression = new();
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private readonly Dictionary<string, IDynamicExpression> CompileDynamicExpression = new();
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public void ClearCache()
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{
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CompileGenericExpression.Clear();
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CompileDynamicExpression.Clear();
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}
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public T Evaluate<T>(string expression)
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{
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if (CompileGenericExpression.TryGetValue(expression, out var result))
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{
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return (result as IGenericExpression<T>).Evaluate();
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}
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var compile = context.CompileGeneric<T>(expression);
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CompileGenericExpression[expression] = compile;
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return compile.Evaluate();
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}
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public object Evaluate(string expression)
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{
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if (CompileDynamicExpression.TryGetValue(expression, out var result))
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{
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return result.Evaluate();
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}
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var compile = context.CompileDynamic(expression);
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CompileDynamicExpression[expression] = compile;
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return compile.Evaluate();
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}
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}
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}
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