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Enums can be extended, i.e. derived from - which comes with some limi…
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src/Thinktecture.Runtime.Extensions.SourceGenerator/CodeAnalysis/BaseEnumState.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Linq; | ||
| using Microsoft.CodeAnalysis; | ||
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| namespace Thinktecture.CodeAnalysis | ||
| { | ||
| public class BaseEnumState : IBaseEnumState | ||
| { | ||
| public bool IsSameAssembly => false; | ||
| public INamedTypeSymbol Type { get; } | ||
| public string? NullableQuestionMark => Type.IsReferenceType ? "?" : null; | ||
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| private IReadOnlyList<ISymbolState>? _items; | ||
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| public IReadOnlyList<ISymbolState> Items => _items ??= Type.EnumerateEnumItems().Select(DefaultSymbolState.CreateFrom).ToList(); | ||
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| private IReadOnlyList<ISymbolState>? _ctorExtraArgs; | ||
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| public IReadOnlyList<ISymbolState> ConstructorArguments | ||
| { | ||
| get | ||
| { | ||
| if (_ctorExtraArgs is null) | ||
| { | ||
| var ctor = Type.Constructors | ||
| .Where(c => c.MethodKind == MethodKind.Constructor && c.DeclaredAccessibility == Accessibility.Protected) | ||
| .OrderBy(c => c.Parameters.Length) | ||
| .FirstOrDefault(); | ||
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| if (ctor is null) | ||
| throw new Exception($"'{Type.Name}' doesn't have a protected constructor."); | ||
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| var ctorAttrArgs = GetCtorParameterNames(ctor); | ||
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| _ctorExtraArgs = ctor.Parameters | ||
| .Select((p, i) => | ||
| { | ||
| var memberName = ctorAttrArgs[i]; | ||
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| if (memberName.Value is not string name) | ||
| throw new Exception($"The parameter '{memberName.Value}' of the 'EnumConstructorAttribute' of '{Type.Name}' at index {i} must be a string."); | ||
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| return new DefaultSymbolState(name, p.Type, p.Name, false); | ||
| }) | ||
| .ToList(); | ||
| } | ||
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| return _ctorExtraArgs; | ||
| } | ||
| } | ||
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| private IReadOnlyList<TypedConstant> GetCtorParameterNames(IMethodSymbol ctor) | ||
| { | ||
| var ctorAttr = Type.FindEnumConstructorAttribute(); | ||
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| if (ctorAttr is null) | ||
| throw new Exception($"'{Type.Name}' doesn't have an 'EnumConstructorAttribute'."); | ||
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| if (ctorAttr.ConstructorArguments.Length != 1) | ||
| throw new Exception($"'EnumConstructorAttribute' of '{Type.Name}' must have exactly 1 argument."); | ||
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| var ctorAttrArgs = ctorAttr.ConstructorArguments[0].Values; | ||
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| if (ctorAttrArgs.Length != ctor.Parameters.Length) | ||
| throw new Exception($"'EnumConstructorAttribute' of '{Type.Name}' specifies {ctorAttrArgs.Length} parameters but the constructor takes {ctor.Parameters.Length} arguments."); | ||
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| return ctorAttrArgs; | ||
| } | ||
|
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| public BaseEnumState(INamedTypeSymbol type) | ||
| { | ||
| Type = type; | ||
| } | ||
| } | ||
| } |
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src/Thinktecture.Runtime.Extensions.SourceGenerator/CodeAnalysis/DefaultSymbolState.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| using Microsoft.CodeAnalysis; | ||
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| namespace Thinktecture.CodeAnalysis | ||
| { | ||
| public class DefaultSymbolState : ISymbolState | ||
| { | ||
| public string Identifier { get; } | ||
| public ITypeSymbol Type { get; } | ||
| public string ArgumentName { get; } | ||
| public bool IsStatic { get; } | ||
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| public DefaultSymbolState(string identifier, ITypeSymbol type, string argumentName, bool isStatic) | ||
| { | ||
| Identifier = identifier; | ||
| Type = type; | ||
| ArgumentName = argumentName; | ||
| IsStatic = isStatic; | ||
| } | ||
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| public static DefaultSymbolState CreateFrom(IFieldSymbol field) | ||
| { | ||
| return new(field.Name, field.Type, field.Name.MakeArgumentName(), field.IsStatic); | ||
| } | ||
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| public static DefaultSymbolState CreateFrom(IPropertySymbol property) | ||
| { | ||
| return new(property.Name, property.Type, property.Name.MakeArgumentName(), property.IsStatic); | ||
| } | ||
| } | ||
| } |
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