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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Text.RegularExpressions;
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using Implab.Diagnostics;
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namespace Implab.ServiceHost.Unity
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{
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using static Trace<TypeResolver>;
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public class TypeResolver
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{
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readonly Dictionary<string, Type> m_cache = new Dictionary<string, Type>();
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Regex _nsRx = new Regex(@"^\w+(\.\w+)*$", RegexOptions.Compiled);
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readonly LinkedList<string> m_namespases = new LinkedList<string>();
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LinkedListNode<string> m_insertAt;
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readonly TypeResolver m_parent;
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public TypeResolver() : this(null) {
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}
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public TypeResolver(TypeResolver parent) {
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m_parent = parent;
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m_insertAt = new LinkedListNode<string>(string.Empty);
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m_namespases.AddFirst(m_insertAt);
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}
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public void AddNamespace(string ns) {
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Safe.ArgumentMatch(ns, nameof(ns), _nsRx);
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if (m_insertAt != null)
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m_namespases.AddAfter(m_insertAt, ns);
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else
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m_namespases.AddFirst(ns);
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}
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public void AddMapping(string typeName, Type type) {
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Safe.ArgumentNotEmpty(typeName, nameof(typeName));
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Safe.ArgumentNotNull(type, nameof(type));
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m_cache[typeName] = type;
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}
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public Type Resolve(TypeReference reference) {
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var args = reference.IsGeneric && !reference.IsOpenGeneric ? reference.GenericParameters?.Select(Resolve).ToArray() : null;
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var argc = reference.IsGeneric ? reference.GenericParameters.Length : 0;
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Type resolved;
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if(!m_cache.TryGetValue(reference.ToString(), out resolved)) {
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resolved = ResolveInternal(reference, args, argc);
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if (resolved == null)
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throw new Exception($"Failed to resolve {reference}");
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m_cache[reference.ToString()] = resolved;
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}
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return resolved;
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}
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public Type Resolve(string typeSpec) {
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return Resolve(TypeReference.Parse(typeSpec));
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}
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Type ResolveInternal(TypeReference reference, Type[] args, int argc) {
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var resolved = ProbeInNamespaces(
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String.Join(".", new [] { reference.Namespace, reference.TypeName }.Where(x => !string.IsNullOrEmpty(x)) ),
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args,
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argc,
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reference.IsArray,
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reference.ToString()
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);
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if (resolved == null && m_parent != null)
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resolved = m_parent.Resolve(reference);
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return resolved;
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}
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public Type ProbeInNamespaces(string localName, Type[] args, int argc, bool isArray, string referenceName) {
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foreach (var ns in m_namespases) {
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var typeName = FormatName(new [] { ns, localName}, argc, args, isArray);
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var resolved = Probe(typeName);
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if (resolved != null) {
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Log("Probe succeed {0} in '{1}': {2} -> {3}", referenceName, ns, typeName, resolved.AssemblyQualifiedName);
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return resolved;
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} else {
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Log("Probe failed {0} in '{1}': {2}", referenceName, ns, typeName);
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}
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}
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return null;
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}
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Type Probe(string typeName) {
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var assemblies = AppDomain.CurrentDomain.GetAssemblies();
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foreach(var assembly in assemblies) {
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var type = assembly.GetType(typeName);
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if (type != null)
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return type;
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}
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return null;
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}
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string FormatName(string[] parts, int argc, Type[] args, bool isArray) {
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var builder = new StringBuilder();
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builder.Append(String.Join(".", parts.Where(x => !string.IsNullOrEmpty(x))));
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if (argc > 0) {
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builder.Append('`');
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builder.Append(argc);
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}
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if (args!= null && args.Length > 0) {
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builder.Append('[');
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builder.Append(string.Join(",", args.Select(x => $"[{x.AssemblyQualifiedName}]")));
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builder.Append(']');
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}
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if(isArray)
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builder.Append("[]");
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return builder.ToString();
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}
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}
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}
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