MegaBites-AI/Windows-powershell

1/* ****************************************************************************2 *3 * Copyright (c) Microsoft Corporation.4 *5 * This source code is subject to terms and conditions of the Apache License, Version 2.0. A6 * copy of the license can be found in the License.html file at the root of this distribution. If7 * you cannot locate the Apache License, Version 2.0, please send an email to8 * dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound9 * by the terms of the Apache License, Version 2.0.10 *11 * You must not remove this notice, or any other, from this software.12 *13 *14 * ***************************************************************************/15 16using System.Reflection;17 18namespace System.Management.Automation.Interpreter19{20    internal abstract class EqualInstruction : Instruction21    {22        // Perf: EqualityComparer<T> but is 3/2 to 2 times slower.23        private static Instruction s_reference, s_boolean, s_SByte, s_int16, s_char, s_int32, s_int64, s_byte, s_UInt16, s_UInt32, s_UInt64, s_single, s_double;24 25        public override int ConsumedStack { get { return 2; } }26 27        public override int ProducedStack { get { return 1; } }28 29        private EqualInstruction()30        {31        }32 33        internal sealed class EqualBoolean : EqualInstruction34        {35            public override int Run(InterpretedFrame frame)36            {37                frame.Push(((bool)frame.Pop()) == ((bool)frame.Pop()));38                return +1;39            }40        }41 42        internal sealed class EqualSByte : EqualInstruction43        {44            public override int Run(InterpretedFrame frame)45            {46                frame.Push(((sbyte)frame.Pop()) == ((sbyte)frame.Pop()));47                return +1;48            }49        }50 51        internal sealed class EqualInt16 : EqualInstruction52        {53            public override int Run(InterpretedFrame frame)54            {55                frame.Push(((Int16)frame.Pop()) == ((Int16)frame.Pop()));56                return +1;57            }58        }59 60        internal sealed class EqualChar : EqualInstruction61        {62            public override int Run(InterpretedFrame frame)63            {64                frame.Push(((char)frame.Pop()) == ((char)frame.Pop()));65                return +1;66            }67        }68 69        internal sealed class EqualInt32 : EqualInstruction70        {71            public override int Run(InterpretedFrame frame)72            {73                frame.Push(((Int32)frame.Pop()) == ((Int32)frame.Pop()));74                return +1;75            }76        }77 78        internal sealed class EqualInt64 : EqualInstruction79        {80            public override int Run(InterpretedFrame frame)81            {82                frame.Push(((Int64)frame.Pop()) == ((Int64)frame.Pop()));83                return +1;84            }85        }86 87        internal sealed class EqualByte : EqualInstruction88        {89            public override int Run(InterpretedFrame frame)90            {91                frame.Push(((byte)frame.Pop()) == ((byte)frame.Pop()));92                return +1;93            }94        }95 96        internal sealed class EqualUInt16 : EqualInstruction97        {98            public override int Run(InterpretedFrame frame)99            {100                frame.Push(((UInt16)frame.Pop()) == ((UInt16)frame.Pop()));101                return +1;102            }103        }104 105        internal sealed class EqualUInt32 : EqualInstruction106        {107            public override int Run(InterpretedFrame frame)108            {109                frame.Push(((UInt32)frame.Pop()) == ((UInt32)frame.Pop()));110                return +1;111            }112        }113 114        internal sealed class EqualUInt64 : EqualInstruction115        {116            public override int Run(InterpretedFrame frame)117            {118                frame.Push(((UInt64)frame.Pop()) == ((UInt64)frame.Pop()));119                return +1;120            }121        }122 123        internal sealed class EqualSingle : EqualInstruction124        {125            public override int Run(InterpretedFrame frame)126            {127                frame.Push(((Single)frame.Pop()) == ((Single)frame.Pop()));128                return +1;129            }130        }131 132        internal sealed class EqualDouble : EqualInstruction133        {134            public override int Run(InterpretedFrame frame)135            {136                frame.Push(((double)frame.Pop()) == ((double)frame.Pop()));137                return +1;138            }139        }140 141        internal sealed class EqualReference : EqualInstruction142        {143            public override int Run(InterpretedFrame frame)144            {145                frame.Push(frame.Pop() == frame.Pop());146                return +1;147            }148        }149 150        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Maintainability", "CA1502:AvoidExcessiveComplexity")]151        public static Instruction Create(Type type)152        {153            // Boxed enums can be unboxed as their underlying types:154            var typeToUse = type.IsEnum ? Enum.GetUnderlyingType(type) : type;155            switch (typeToUse.GetTypeCode())156            {157                case TypeCode.Boolean: return s_boolean ??= new EqualBoolean();158                case TypeCode.SByte: return s_SByte ??= new EqualSByte();159                case TypeCode.Byte: return s_byte ??= new EqualByte();160                case TypeCode.Char: return s_char ??= new EqualChar();161                case TypeCode.Int16: return s_int16 ??= new EqualInt16();162                case TypeCode.Int32: return s_int32 ??= new EqualInt32();163                case TypeCode.Int64: return s_int64 ??= new EqualInt64();164 165                case TypeCode.UInt16: return s_UInt16 ??= new EqualInt16();166                case TypeCode.UInt32: return s_UInt32 ??= new EqualInt32();167                case TypeCode.UInt64: return s_UInt64 ??= new EqualInt64();168 169                case TypeCode.Single: return s_single ??= new EqualSingle();170                case TypeCode.Double: return s_double ??= new EqualDouble();171 172                case TypeCode.Object:173                    if (!type.IsValueType)174                    {175                        return s_reference ??= new EqualReference();176                    }177                    // TODO: Nullable<T>178                    throw new NotImplementedException();179 180                default:181                    throw new NotImplementedException();182            }183        }184 185        public override string ToString()186        {187            return "Equal()";188        }189    }190}191