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Operator.cs
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Operator.cs
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using System;
using System.Collections.Generic;
namespace callculator
{
public class Operator
{
public delegate double EvaluationDelegate(double x, double y = 0);
/// <summary>
/// Dictionary mapping operator string to a 2-tuple where the first
/// item in the tuple is operator precendence and the second item in
/// the tuple is associativity.
/// </summary>
private readonly Dictionary<string, Tuple<int, string, EvaluationDelegate>> operatorInfo =
new Dictionary<string, Tuple<int, string, EvaluationDelegate>>()
{
{"#", new Tuple<int, string, EvaluationDelegate>(5, "right", (x, y) => -x)},
{"@", new Tuple<int, string, EvaluationDelegate>(5, "right", (x, y) => x)},
{"^", new Tuple<int, string, EvaluationDelegate>(4, "right", Math.Pow)},
{"*", new Tuple<int, string, EvaluationDelegate>(3, "left", (x, y) => x * y)},
{"/", new Tuple<int, string, EvaluationDelegate>(3, "left", (x, y) => x / y)},
{"+", new Tuple<int, string, EvaluationDelegate>(2, "left", (x, y) => x + y)},
{"-", new Tuple<int, string, EvaluationDelegate>(2, "left", (x, y) => x - y)}
};
private readonly Token op;
public Operator(Token token)
{
this.op = token;
}
public Token Op
{
get
{
return op;
}
}
public int Precedence
{
get
{
Tuple<int, string, EvaluationDelegate> tuple;
operatorInfo.TryGetValue(op.Value, out tuple);
return tuple.Item1;
}
}
public string Associativity
{
get
{
Tuple<int, string, EvaluationDelegate> tuple;
operatorInfo.TryGetValue(op.Value, out tuple);
return tuple.Item2;
}
}
public EvaluationDelegate Operation
{
get
{
Tuple<int, string, EvaluationDelegate> tuple;
operatorInfo.TryGetValue(op.Value, out tuple);
return tuple.Item3;
}
}
}
}