99 lines
3.1 KiB
C#
99 lines
3.1 KiB
C#
using System;
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namespace ARMeilleure.CodeGen.Linking
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{
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/// <summary>
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/// Represents a symbol.
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/// </summary>
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readonly struct Symbol
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{
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private readonly ulong _value;
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/// <summary>
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/// Gets the <see cref="SymbolType"/> of the <see cref="Symbol"/>.
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/// </summary>
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public SymbolType Type { get; }
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/// <summary>
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/// Gets the value of the <see cref="Symbol"/>.
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/// </summary>
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/// <exception cref="InvalidOperationException"><see cref="Type"/> is <see cref="SymbolType.None"/></exception>
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public ulong Value
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{
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get
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{
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if (Type == SymbolType.None)
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{
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ThrowSymbolNone();
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}
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return _value;
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}
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="Symbol"/> structure with the specified <see cref="SymbolType"/> and value.
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/// </summary>
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/// <param name="type">Type of symbol</param>
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/// <param name="value">Value of symbol</param>
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public Symbol(SymbolType type, ulong value)
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{
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(Type, _value) = (type, value);
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}
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/// <summary>
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/// Determines if the specified <see cref="Symbol"/> instances are equal.
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/// </summary>
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/// <param name="a">First instance</param>
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/// <param name="b">Second instance</param>
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/// <returns><see langword="true"/> if equal; otherwise <see langword="false"/></returns>
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public static bool operator ==(Symbol a, Symbol b)
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{
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return a.Equals(b);
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}
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/// <summary>
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/// Determines if the specified <see cref="Symbol"/> instances are not equal.
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/// </summary>
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/// <param name="a">First instance</param>
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/// <param name="b">Second instance</param>
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/// <returns><see langword="true"/> if not equal; otherwise <see langword="false"/></returns>
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public static bool operator !=(Symbol a, Symbol b)
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{
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return !(a == b);
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}
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/// <summary>
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/// Determines if the specified <see cref="Symbol"/> is equal to this <see cref="Symbol"/> instance.
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/// </summary>
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/// <param name="other">Other <see cref="Symbol"/> instance</param>
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/// <returns><see langword="true"/> if equal; otherwise <see langword="false"/></returns>
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public bool Equals(Symbol other)
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{
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return other.Type == Type && other._value == _value;
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}
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/// <inheritdoc/>
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public override bool Equals(object obj)
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{
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return obj is Symbol sym && Equals(sym);
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}
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/// <inheritdoc/>
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public override int GetHashCode()
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{
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return HashCode.Combine(Type, _value);
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}
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/// <inheritdoc/>
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public override string ToString()
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{
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return $"{Type}:{_value}";
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}
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private static void ThrowSymbolNone()
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{
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throw new InvalidOperationException("Symbol refers to nothing.");
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}
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}
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}
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