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Log.cs
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Log.cs
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// Copyright (c) Dmytro Kyshchenko. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
using System.Collections.Immutable;
using System.Numerics;
namespace xFunc.Maths.Expressions;
/// <summary>
/// Represents the Logarithm function.
/// </summary>
public class Log : BinaryExpression
{
/// <summary>
/// Gets the lambda for the current expression.
/// </summary>
internal static Lambda Lambda { get; } = new Lambda(
new[] { Variable.X.Name, Variable.Y.Name },
new Log(Variable.X, Variable.Y));
/// <summary>
/// Initializes a new instance of the <see cref="Log"/> class.
/// </summary>
/// <param name="base">The right operand.</param>
/// <param name="arg">The left operand.</param>
/// <seealso cref="IExpression"/>
public Log(IExpression @base, IExpression arg)
: base(@base, arg)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="Log"/> class.
/// </summary>
/// <param name="arguments">The list of arguments.</param>
/// <seealso cref="IExpression"/>
public Log(ImmutableArray<IExpression> arguments)
: base(arguments)
{
}
/// <inheritdoc />
public override object Execute(ExpressionParameters? parameters)
{
var leftResult = Left.Execute(parameters);
var rightResult = Right.Execute(parameters);
return (leftResult, rightResult) switch
{
(NumberValue left, NumberValue right) => NumberValue.Log(right, left),
(NumberValue left, Complex complex) => NumberValue.Log(complex, left),
(NumberValue left, RationalValue right) => RationalValue.Log(right, left),
_ => throw ExecutionException.For(this),
};
}
/// <inheritdoc />
protected override TResult AnalyzeInternal<TResult>(IAnalyzer<TResult> analyzer)
=> analyzer.Analyze(this);
/// <inheritdoc />
protected override TResult AnalyzeInternal<TResult, TContext>(
IAnalyzer<TResult, TContext> analyzer,
TContext context)
=> analyzer.Analyze(this, context);
/// <inheritdoc />
public override IExpression Clone(IExpression? left = null, IExpression? right = null)
=> new Log(left ?? Left, right ?? Right);
}