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using System;
using System.Collections;
using System.Collections.Generic;
namespace Godot
{
using Array = Godot.Collections.Array;
using Dictionary = Godot.Collections.Dictionary;
static class MarshalUtils
{
/// <summary>
/// Returns <see langword="true"/> if the generic type definition of <paramref name="type"/>
/// is <see cref="Godot.Collections.Array{T}"/>; otherwise returns <see langword="false"/>.
/// </summary>
/// <exception cref="System.InvalidOperationException">
/// <paramref name="type"/> is not a generic type. That is, IsGenericType returns false.
/// </exception>
static bool TypeIsGenericArray(Type type)
{
return type.GetGenericTypeDefinition() == typeof(Godot.Collections.Array<>);
}
/// <summary>
/// Returns <see langword="true"/> if the generic type definition of <paramref name="type"/>
/// is <see cref="Godot.Collections.Dictionary{TKey, TValue}"/>; otherwise returns <see langword="false"/>.
/// </summary>
/// <exception cref="System.InvalidOperationException">
/// <paramref name="type"/> is not a generic type. That is, IsGenericType returns false.
/// </exception>
static bool TypeIsGenericDictionary(Type type)
{
return type.GetGenericTypeDefinition() == typeof(Godot.Collections.Dictionary<,>);
}
static void ArrayGetElementType(Type arrayType, out Type elementType)
{
elementType = arrayType.GetGenericArguments()[0];
}
static void DictionaryGetKeyValueTypes(Type dictionaryType, out Type keyType, out Type valueType)
{
var genericArgs = dictionaryType.GetGenericArguments();
keyType = genericArgs[0];
valueType = genericArgs[1];
}
static bool GenericIEnumerableIsAssignableFromType(Type type)
{
if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(IEnumerable<>))
return true;
foreach (var interfaceType in type.GetInterfaces())
{
if (interfaceType.IsGenericType && interfaceType.GetGenericTypeDefinition() == typeof(IEnumerable<>))
return true;
}
Type baseType = type.BaseType;
if (baseType == null)
return false;
return GenericIEnumerableIsAssignableFromType(baseType);
}
static bool GenericIDictionaryIsAssignableFromType(Type type)
{
if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(IDictionary<,>))
return true;
foreach (var interfaceType in type.GetInterfaces())
{
if (interfaceType.IsGenericType && interfaceType.GetGenericTypeDefinition() == typeof(IDictionary<,>))
return true;
}
Type baseType = type.BaseType;
if (baseType == null)
return false;
return GenericIDictionaryIsAssignableFromType(baseType);
}
static bool GenericIEnumerableIsAssignableFromType(Type type, out Type elementType)
{
if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(IEnumerable<>))
{
elementType = type.GetGenericArguments()[0];
return true;
}
foreach (var interfaceType in type.GetInterfaces())
{
if (interfaceType.IsGenericType && interfaceType.GetGenericTypeDefinition() == typeof(IEnumerable<>))
{
elementType = interfaceType.GetGenericArguments()[0];
return true;
}
}
Type baseType = type.BaseType;
if (baseType == null)
{
elementType = null;
return false;
}
return GenericIEnumerableIsAssignableFromType(baseType, out elementType);
}
static bool GenericIDictionaryIsAssignableFromType(Type type, out Type keyType, out Type valueType)
{
if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(IDictionary<,>))
{
var genericArgs = type.GetGenericArguments();
keyType = genericArgs[0];
valueType = genericArgs[1];
return true;
}
foreach (var interfaceType in type.GetInterfaces())
{
if (interfaceType.IsGenericType && interfaceType.GetGenericTypeDefinition() == typeof(IDictionary<,>))
{
var genericArgs = interfaceType.GetGenericArguments();
keyType = genericArgs[0];
valueType = genericArgs[1];
return true;
}
}
Type baseType = type.BaseType;
if (baseType == null)
{
keyType = null;
valueType = null;
return false;
}
return GenericIDictionaryIsAssignableFromType(baseType, out keyType, out valueType);
}
static Type MakeGenericArrayType(Type elemType)
{
return typeof(Godot.Collections.Array<>).MakeGenericType(elemType);
}
static Type MakeGenericDictionaryType(Type keyType, Type valueType)
{
return typeof(Godot.Collections.Dictionary<,>).MakeGenericType(keyType, valueType);
}
// TODO Add support for IEnumerable<T> and IDictionary<TKey, TValue>
// TODO: EnumerableToArray and IDictionaryToDictionary can be optimized
internal static void EnumerableToArray(IEnumerable enumerable, IntPtr godotArrayPtr)
{
if (enumerable is ICollection collection)
{
int count = collection.Count;
object[] tempArray = new object[count];
collection.CopyTo(tempArray, 0);
for (int i = 0; i < count; i++)
{
Array.godot_icall_Array_Add(godotArrayPtr, tempArray[i]);
}
}
else
{
foreach (object element in enumerable)
{
Array.godot_icall_Array_Add(godotArrayPtr, element);
}
}
}
internal static void IDictionaryToDictionary(IDictionary dictionary, IntPtr godotDictionaryPtr)
{
foreach (DictionaryEntry entry in dictionary)
{
Dictionary.godot_icall_Dictionary_Add(godotDictionaryPtr, entry.Key, entry.Value);
}
}
internal static void GenericIDictionaryToDictionary(object dictionary, IntPtr godotDictionaryPtr)
{
#if DEBUG
if (!GenericIDictionaryIsAssignableFromType(dictionary.GetType()))
throw new InvalidOperationException("The type does not implement IDictionary<,>");
#endif
// TODO: Can we optimize this?
var keys = ((IEnumerable)dictionary.GetType().GetProperty("Keys").GetValue(dictionary)).GetEnumerator();
var values = ((IEnumerable)dictionary.GetType().GetProperty("Values").GetValue(dictionary)).GetEnumerator();
while (keys.MoveNext() && values.MoveNext())
{
object key = keys.Current;
object value = values.Current;
Dictionary.godot_icall_Dictionary_Add(godotDictionaryPtr, key, value);
}
}
}
}
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