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// Copyright (c) 2013-2021 Bruyère Jean-Philippe <jp_bruyere@hotmail.com>
//
// This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
using System;
using Crow.Text;
using System.Diagnostics.CodeAnalysis;
namespace Crow
{
public struct Token : IComparable<Token>, IEquatable<Token> {
public readonly TokenType Type;
public int Start;
public readonly int Length;
public int End => Start + Length;
public TextSpan Span => new TextSpan (Start, End);
public string AsString (ReadOnlySpan<char> source)
=> source.Slice (Start, Length).ToString();
public Token (TokenType type, int pos) {
Type = type;
Start = pos;
Length = 1;
}
public Token (TokenType type, int start, int end) {
Type = type;
Start = start;
Length = end - start;
}
public int CompareTo([AllowNull] Token other)
=> Start - other.Start;
public bool Equals([AllowNull] Token other)
=> Type == other.Type && Start == other.Start && Length == other.Length;
public override bool Equals(object obj)
=> obj is Token other ? Equals (other) : false;
public override int GetHashCode() => HashCode.Combine (Type, Start, Length);
public override string ToString() => $"{Type}:{Start},{Length};";
}
}
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