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using System;
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using System.Collections.Generic;
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using Implab.Diagnostics;
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namespace Implab.ServiceHost.Unity {
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using static Trace<TypeResolver>;
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/// <summary>
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/// Позволяет обойти вложенные типы и собрать цеочку из типов и параметров генериков, которые они предлагают
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/// </summary>
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internal class TypeResolutionContext {
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readonly TypeResolver m_resolver;
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readonly List<Type> m_genericParameters = new List<Type>();
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public IEnumerable<Type> GenericParameters { get { return m_genericParameters; } }
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public Type ResolvedType { get; private set; }
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public int ArrayRank { get; private set; }
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public bool ThrowOnFail { get; private set; }
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public TypeResolutionContext(TypeResolver resolver, bool throwOnFail) {
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m_resolver = resolver;
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ThrowOnFail = throwOnFail;
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}
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public Type MakeType() {
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return m_genericParameters.Count > 0 ?
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ResolvedType?.MakeGenericType(m_genericParameters.ToArray()) :
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ResolvedType;
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}
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public void Visit(SpecializedTypeReference typeReference) {
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typeReference.GenericType.Visit(this);
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if (ResolvedType != null) {
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foreach (var genericParamRef in typeReference.GenericParameters) {
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var context = new TypeResolutionContext(m_resolver, ThrowOnFail);
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genericParamRef.Visit(context);
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m_genericParameters.Add(context.MakeType());
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}
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}
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}
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public void Visit(NestedTypeReference typeReference) {
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typeReference.DeclaringType.Visit(this);
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if (ResolvedType != null)
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ResolvedType = ResolvedType?.GetNestedType(typeReference.ClrName) ?? Failed(typeReference);
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}
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public void Visit(RootTypeReference typeReference) {
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ResolvedType = m_resolver.Resolve(typeReference.Namespace, typeReference.ClrName) ?? Failed(typeReference);
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}
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public void Visit(ArrayTypeReference typeReference) {
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var context = new TypeResolutionContext(m_resolver, ThrowOnFail);
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typeReference.ItemsType.Visit(context);
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ResolvedType = typeReference.Rank == 1 ?
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context.MakeType()?.MakeArrayType() :
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context.MakeType()?.MakeArrayType(typeReference.Rank);
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}
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Type Failed(TypeReference reference) {
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Log($"Falied to resolve {reference}");
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if (ThrowOnFail)
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throw new Exception($"Failed to resolve {reference}");
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return null;
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}
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}
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}
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