53 lines
1.9 KiB
C#
53 lines
1.9 KiB
C#
using Qrakhen.Qamp.Core.Collections;
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using Qrakhen.Qamp.Core.Values.Objects;
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namespace Qrakhen.Qamp.Core.Values;
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public delegate Value ExtensionDelegate(Value target, Value[] parameters);
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public class NativeExtension(
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ValueType targetType,
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string name,
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ExtensionDelegate callback,
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string[] parameters)
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{
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private static readonly Register<ValueType, Register<string, NativeExtension>> _register = new();
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public readonly string Name = name;
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public readonly ValueType TargetType = targetType;
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public readonly ExtensionDelegate Callback = callback;
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public readonly string[] Parameters = parameters.ToArray();
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public static NativeExtension? Get(ValueType targetType, string name)
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{
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if (!_register.Has(targetType))
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return null;
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if (!_register[targetType].Has(name))
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return null;
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return _register[targetType][name];
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}
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public static void Register(ValueType targetType,
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string name,
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ExtensionDelegate callback,
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params string[] parameters)
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{
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if (!_register.Has(targetType))
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_register.Add(targetType, new());
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if (_register[targetType].Has(name))
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throw new QampException($"Extension {name} already exists for type {targetType}.");
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_register[targetType].Add(name, new NativeExtension(targetType, name, callback, parameters));
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}
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static NativeExtension()
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{
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Register(ValueType.String, "Length", (v, p) => new Value((long)v.Ptr.As<Objects.String>()!.Value!.Length), []);
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Register(ValueType.String, "IndexOf", (v, p) => new Value((long)v.Ptr.As<Objects.String>()!.Value!.IndexOf(p[0].Ptr.As<Objects.String>()!.Value!)), [ "needle" ]);
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}
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public override string ToString()
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{
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return $"{TargetType}.{Name}({string.Join(", ", Parameters)}) (NativeExtension)";
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}
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}
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