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Merge pull request godotengine#27497 from neikeq/dynamicmetaobject
C#: Add DynamicGodotObject class
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,213 @@ | ||
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| using System; | ||
| using System.Collections.Generic; | ||
| using System.Dynamic; | ||
| using System.Linq.Expressions; | ||
| using System.Runtime.CompilerServices; | ||
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| namespace Godot | ||
| { | ||
| /// <summary> | ||
| /// Represents an <see cref="Godot.Object"/> whose members can be dynamically accessed at runtime through the Variant API. | ||
| /// </summary> | ||
| /// <remarks> | ||
| /// <para> | ||
| /// The <see cref="Godot.DynamicGodotObject"/> class enables access to the Variant | ||
| /// members of a <see cref="Godot.Object"/> instance at runtime. | ||
| /// </para> | ||
| /// <para> | ||
| /// This allows accessing the class members using their original names in the engine as well as the members from the | ||
| /// script attached to the <see cref="Godot.Object"/>, regardless of the scripting language it was written in. | ||
| /// </para> | ||
| /// </remarks> | ||
| /// <example> | ||
| /// This sample shows how to use <see cref="Godot.DynamicGodotObject"/> to dynamically access the engine members of a <see cref="Godot.Object"/>. | ||
| /// <code> | ||
| /// dynamic sprite = GetNode("Sprite").DynamicGodotObject; | ||
| /// sprite.add_child(this); | ||
| /// | ||
| /// if ((sprite.hframes * sprite.vframes) > 0) | ||
| /// sprite.frame = 0; | ||
| /// </code> | ||
| /// </example> | ||
| /// <example> | ||
| /// This sample shows how to use <see cref="Godot.DynamicGodotObject"/> to dynamically access the members of the script attached to a <see cref="Godot.Object"/>. | ||
| /// <code> | ||
| /// dynamic childNode = GetNode("ChildNode").DynamicGodotObject; | ||
| /// | ||
| /// if (childNode.print_allowed) | ||
| /// { | ||
| /// childNode.message = "Hello from C#"; | ||
| /// childNode.print_message(3); | ||
| /// } | ||
| /// </code> | ||
| /// The <c>ChildNode</c> node has the following GDScript script attached: | ||
| /// <code> | ||
| /// // # ChildNode.gd | ||
| /// // var print_allowed = true | ||
| /// // var message = "" | ||
| /// // | ||
| /// // func print_message(times): | ||
| /// // for i in times: | ||
| /// // print(message) | ||
| /// </code> | ||
| /// </example> | ||
| public class DynamicGodotObject : DynamicObject | ||
| { | ||
| /// <summary> | ||
| /// Gets the <see cref="Godot.Object"/> associated with this <see cref="Godot.DynamicGodotObject"/>. | ||
| /// </summary> | ||
| public Object Value { get; } | ||
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| /// <summary> | ||
| /// Initializes a new instance of the <see cref="Godot.DynamicGodotObject"/> class. | ||
| /// </summary> | ||
| /// <param name="godotObject"> | ||
| /// The <see cref="Godot.Object"/> that will be associated with this <see cref="Godot.DynamicGodotObject"/>. | ||
| /// </param> | ||
| /// <exception cref="System.ArgumentNullException"> | ||
| /// Thrown when the <paramref name="godotObject"/> parameter is null. | ||
| /// </exception> | ||
| public DynamicGodotObject(Object godotObject) | ||
| { | ||
| if (godotObject == null) | ||
| throw new ArgumentNullException(nameof(godotObject)); | ||
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| this.Value = godotObject; | ||
| } | ||
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| public override IEnumerable<string> GetDynamicMemberNames() | ||
| { | ||
| return godot_icall_DynamicGodotObject_SetMemberList(Object.GetPtr(Value)); | ||
| } | ||
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| public override bool TryBinaryOperation(BinaryOperationBinder binder, object arg, out object result) | ||
| { | ||
| switch (binder.Operation) | ||
| { | ||
| case ExpressionType.Equal: | ||
| case ExpressionType.NotEqual: | ||
| if (binder.ReturnType == typeof(bool) || binder.ReturnType.IsAssignableFrom(typeof(bool))) | ||
| { | ||
| if (arg == null) | ||
| { | ||
| bool boolResult = Object.IsInstanceValid(Value); | ||
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| if (binder.Operation == ExpressionType.Equal) | ||
| boolResult = !boolResult; | ||
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| result = boolResult; | ||
| return true; | ||
| } | ||
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| if (arg is Object other) | ||
| { | ||
| bool boolResult = (Value == other); | ||
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| if (binder.Operation == ExpressionType.NotEqual) | ||
| boolResult = !boolResult; | ||
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| result = boolResult; | ||
| return true; | ||
| } | ||
| } | ||
|
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| break; | ||
| default: | ||
| // We're not implementing operators <, <=, >, and >= (LessThan, LessThanOrEqual, GreaterThan, GreaterThanOrEqual). | ||
| // These are used on the actual pointers in variant_op.cpp. It's better to let the user do that explicitly. | ||
| break; | ||
| } | ||
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| return base.TryBinaryOperation(binder, arg, out result); | ||
| } | ||
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| public override bool TryConvert(ConvertBinder binder, out object result) | ||
| { | ||
| if (binder.Type == typeof(Object)) | ||
| { | ||
| result = Value; | ||
| return true; | ||
| } | ||
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| if (typeof(Object).IsAssignableFrom(binder.Type)) | ||
| { | ||
| // Throws InvalidCastException when the cast fails | ||
| result = Convert.ChangeType(Value, binder.Type); | ||
| return true; | ||
| } | ||
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| return base.TryConvert(binder, out result); | ||
| } | ||
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| public override bool TryGetIndex(GetIndexBinder binder, object[] indexes, out object result) | ||
| { | ||
| if (indexes.Length == 1) | ||
| { | ||
| if (indexes[0] is string name) | ||
| { | ||
| return godot_icall_DynamicGodotObject_GetMember(Object.GetPtr(Value), name, out result); | ||
| } | ||
| } | ||
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| return base.TryGetIndex(binder, indexes, out result); | ||
| } | ||
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| public override bool TryGetMember(GetMemberBinder binder, out object result) | ||
| { | ||
| return godot_icall_DynamicGodotObject_GetMember(Object.GetPtr(Value), binder.Name, out result); | ||
| } | ||
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| public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result) | ||
| { | ||
| return godot_icall_DynamicGodotObject_InvokeMember(Object.GetPtr(Value), binder.Name, args, out result); | ||
| } | ||
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| public override bool TrySetIndex(SetIndexBinder binder, object[] indexes, object value) | ||
| { | ||
| if (indexes.Length == 1) | ||
| { | ||
| if (indexes[0] is string name) | ||
| { | ||
| return godot_icall_DynamicGodotObject_SetMember(Object.GetPtr(Value), name, value); | ||
| } | ||
| } | ||
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| return base.TrySetIndex(binder, indexes, value); | ||
| } | ||
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| public override bool TrySetMember(SetMemberBinder binder, object value) | ||
| { | ||
| return godot_icall_DynamicGodotObject_SetMember(Object.GetPtr(Value), binder.Name, value); | ||
| } | ||
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| [MethodImpl(MethodImplOptions.InternalCall)] | ||
| internal extern static string[] godot_icall_DynamicGodotObject_SetMemberList(IntPtr godotObject); | ||
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| [MethodImpl(MethodImplOptions.InternalCall)] | ||
| internal extern static bool godot_icall_DynamicGodotObject_InvokeMember(IntPtr godotObject, string name, object[] args, out object result); | ||
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| [MethodImpl(MethodImplOptions.InternalCall)] | ||
| internal extern static bool godot_icall_DynamicGodotObject_GetMember(IntPtr godotObject, string name, out object result); | ||
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| [MethodImpl(MethodImplOptions.InternalCall)] | ||
| internal extern static bool godot_icall_DynamicGodotObject_SetMember(IntPtr godotObject, string name, object value); | ||
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| #region We don't override these methods | ||
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| // Looks like this is not usable from C# | ||
| //public override bool TryCreateInstance(CreateInstanceBinder binder, object[] args, out object result); | ||
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| // Object members cannot be deleted | ||
| //public override bool TryDeleteIndex(DeleteIndexBinder binder, object[] indexes); | ||
| //public override bool TryDeleteMember(DeleteMemberBinder binder); | ||
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| // Invokation on the object itself, e.g.: obj(param) | ||
| //public override bool TryInvoke(InvokeBinder binder, object[] args, out object result); | ||
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| // No unnary operations to handle | ||
| //public override bool TryUnaryOperation(UnaryOperationBinder binder, out object result); | ||
|
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| #endregion | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| /*************************************************************************/ | ||
| /* arguments_vector.h */ | ||
| /*************************************************************************/ | ||
| /* This file is part of: */ | ||
| /* GODOT ENGINE */ | ||
| /* https://godotengine.org */ | ||
| /*************************************************************************/ | ||
| /* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur. */ | ||
| /* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md) */ | ||
| /* */ | ||
| /* Permission is hereby granted, free of charge, to any person obtaining */ | ||
| /* a copy of this software and associated documentation files (the */ | ||
| /* "Software"), to deal in the Software without restriction, including */ | ||
| /* without limitation the rights to use, copy, modify, merge, publish, */ | ||
| /* distribute, sublicense, and/or sell copies of the Software, and to */ | ||
| /* permit persons to whom the Software is furnished to do so, subject to */ | ||
| /* the following conditions: */ | ||
| /* */ | ||
| /* The above copyright notice and this permission notice shall be */ | ||
| /* included in all copies or substantial portions of the Software. */ | ||
| /* */ | ||
| /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */ | ||
| /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */ | ||
| /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/ | ||
| /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */ | ||
| /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */ | ||
| /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */ | ||
| /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ | ||
| /*************************************************************************/ | ||
|
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| #ifndef ARGUMENTS_VECTOR_H | ||
| #define ARGUMENTS_VECTOR_H | ||
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| #include "core/os/memory.h" | ||
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| template <typename T, int POOL_SIZE = 5> | ||
| struct ArgumentsVector { | ||
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| private: | ||
| T pool[POOL_SIZE]; | ||
| T *_ptr; | ||
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| ArgumentsVector(); | ||
| ArgumentsVector(const ArgumentsVector &); | ||
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| public: | ||
| T *ptr() { return _ptr; } | ||
| T &get(int p_idx) { return _ptr[p_idx]; } | ||
| void set(int p_idx, const T &p_value) { _ptr[p_idx] = p_value; } | ||
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| explicit ArgumentsVector(int size) { | ||
| if (size <= POOL_SIZE) { | ||
| _ptr = pool; | ||
| } else { | ||
| _ptr = memnew_arr(T, size); | ||
| } | ||
| } | ||
| }; | ||
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| #endif // ARGUMENTS_VECTOR_H |
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