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using System.Linq;
using System;
using System.Collections.Generic;
using System.Resources;
namespace Python.Runtime
{
/// <summary>
/// This class is responsible for efficiently maintaining the bits
/// of information we need to support aliases with 'nice names'.
/// </summary>
internal static class GenericUtil
{
/// <summary>
/// Maps namespace -> generic base name -> list of generic type names
/// </summary>
private static Dictionary<string, Dictionary<string, List<string>>> mapping;
public static void Reset()
{
mapping = new Dictionary<string, Dictionary<string, List<string>>>();
}
/// <summary>
/// Register a generic type that appears in a given namespace.
/// </summary>
/// <param name="t">A generic type definition (<c>t.IsGenericTypeDefinition</c> must be true)</param>
internal static void Register(Type t)
{
if (null == t.Namespace || null == t.Name)
{
return;
}
Dictionary<string, List<string>> nsmap;
if (!mapping.TryGetValue(t.Namespace, out nsmap))
{
nsmap = new Dictionary<string, List<string>>();
mapping[t.Namespace] = nsmap;
}
string basename = GetBasename(t.Name);
List<string> gnames;
if (!nsmap.TryGetValue(basename, out gnames))
{
gnames = new List<string>();
nsmap[basename] = gnames;
}
gnames.Add(t.Name);
}
/// <summary>
/// xxx
/// </summary>
public static List<string> GetGenericBaseNames(string ns)
{
Dictionary<string, List<string>> nsmap;
if (!mapping.TryGetValue(ns, out nsmap))
{
return null;
}
var names = new List<string>();
foreach (string key in nsmap.Keys)
{
names.Add(key);
}
return names;
}
/// <summary>
/// Finds a generic type with the given number of generic parameters and the same name and namespace as <paramref name="t"/>.
/// </summary>
public static Type GenericForType(Type t, int paramCount)
{
return GenericByName(t.Namespace, t.Name, paramCount);
}
/// <summary>
/// Finds a generic type in the given namespace with the given name and number of generic parameters.
/// </summary>
public static Type GenericByName(string ns, string basename, int paramCount)
{
Dictionary<string, List<string>> nsmap;
if (!mapping.TryGetValue(ns, out nsmap))
{
return null;
}
List<string> names;
if (!nsmap.TryGetValue(GetBasename(basename), out names))
{
return null;
}
foreach (string name in names)
{
string qname = ns + "." + name;
Type o = AssemblyManager.LookupTypes(qname).FirstOrDefault();
if (o != null && o.GetGenericArguments().Length == paramCount)
{
return o;
}
}
return null;
}
/// <summary>
/// xxx
/// </summary>
public static string GenericNameForBaseName(string ns, string name)
{
Dictionary<string, List<string>> nsmap;
if (!mapping.TryGetValue(ns, out nsmap))
{
return null;
}
List<string> gnames;
nsmap.TryGetValue(name, out gnames);
if (gnames?.Count > 0)
{
return gnames[0];
}
return null;
}
private static string GetBasename(string name)
{
int tick = name.IndexOf("`");
if (tick > -1)
{
return name.Substring(0, tick);
}
else
{
return name;
}
}
}
}