├── .gitignore ├── LICENSE ├── README.md └── src ├── Contrib.Bcl.Ranges ├── Contrib.Bcl.Ranges.csproj ├── ForwardedTypes.cs ├── Index.cs ├── Range.cs ├── RuntimeHelpers.cs └── StringBuilderCache.cs ├── Directory.Build.props ├── global.json └── refs └── Contrib.Bcl.Ranges.Ref └── Contrib.Bcl.Ranges.Ref.csproj /.gitignore: -------------------------------------------------------------------------------- 1 | 2 | # Created by https://www.gitignore.io/api/rider,visualstudio,visualstudiocode 3 | # Edit at https://www.gitignore.io/?templates=rider,visualstudio,visualstudiocode 4 | 5 | ### Rider ### 6 | # Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm 7 | # Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839 8 | 9 | # User-specific stuff 10 | .idea/**/workspace.xml 11 | .idea/**/tasks.xml 12 | .idea/**/usage.statistics.xml 13 | .idea/**/dictionaries 14 | .idea/**/shelf 15 | 16 | # Generated files 17 | .idea/**/contentModel.xml 18 | 19 | # Sensitive or high-churn files 20 | .idea/**/dataSources/ 21 | .idea/**/dataSources.ids 22 | .idea/**/dataSources.local.xml 23 | .idea/**/sqlDataSources.xml 24 | .idea/**/dynamic.xml 25 | .idea/**/uiDesigner.xml 26 | .idea/**/dbnavigator.xml 27 | 28 | # Gradle 29 | .idea/**/gradle.xml 30 | .idea/**/libraries 31 | 32 | # Gradle and Maven with auto-import 33 | # When using Gradle or Maven with auto-import, you should exclude module files, 34 | # since they will be recreated, and may cause churn. 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IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Contrib.Bcl.Ranges 2 | 3 | This package polyfills the types required for the C# 8.0 feature [Ranges](https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-8#indices-and-ranges) on targets lower than `netcoreapp3.0` and `netstandard2.1`. This includes: 4 | - .NET Framework - starting from `net461` 5 | - .NET Standard 2.0 Compatible Runtimes - this includes .NET Core 2.x 6 | 7 | ## Usage 8 | 9 | Add this to your `csproj` file: 10 | ```xml 11 | 12 | ``` 13 | and add this to the `PropertyGroup`: 14 | ```xml 15 | 8.0 16 | ``` 17 | 18 | Now we can start using this handy new language feature 😀 19 | ```csharp 20 | Console.WriteLine("Hello world!"[6..^1]); // world 21 | ``` 22 | -------------------------------------------------------------------------------- /src/Contrib.Bcl.Ranges/Contrib.Bcl.Ranges.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | net461;net47;netstandard2.0;netstandard2.1 5 | 6 | 7 | $(DefineConstants),NO_RANGES_SUPPORT 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | -------------------------------------------------------------------------------- /src/Contrib.Bcl.Ranges/ForwardedTypes.cs: -------------------------------------------------------------------------------- 1 | #if (REFERENCE_ASSEMBLY && !NO_RANGES_SUPPORT) 2 | using System.Runtime.CompilerServices; 3 | 4 | [assembly: TypeForwardedTo(typeof(System.Range))] 5 | [assembly: TypeForwardedTo(typeof(System.Index))] 6 | 7 | #endif -------------------------------------------------------------------------------- /src/Contrib.Bcl.Ranges/Index.cs: -------------------------------------------------------------------------------- 1 | // Licensed to the .NET Foundation under one or more agreements. 2 | // The .NET Foundation licenses this file to you under the MIT license. 3 | // See the LICENSE file in the project root for more information. 4 | 5 | #if NO_RANGES_SUPPORT 6 | using System.Runtime.CompilerServices; 7 | 8 | namespace System 9 | { 10 | /// Represent a type can be used to index a collection either from the start or the end. 11 | /// 12 | /// Index is used by the C# compiler to support the new index syntax 13 | /// 14 | /// int[] someArray = new int[5] { 1, 2, 3, 4, 5 } ; 15 | /// int lastElement = someArray[^1]; // lastElement = 5 16 | /// 17 | /// 18 | public readonly struct Index : IEquatable 19 | { 20 | private readonly int _value; 21 | 22 | /// Construct an Index using a value and indicating if the index is from the start or from the end. 23 | /// The index value. it has to be zero or positive number. 24 | /// Indicating if the index is from the start or from the end. 25 | /// 26 | /// If the Index constructed from the end, index value 1 means pointing at the last element and index value 0 means pointing at beyond last element. 27 | /// 28 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 29 | public Index(int value, bool fromEnd = false) 30 | { 31 | if (value < 0) 32 | { 33 | throw new ArgumentOutOfRangeException(nameof(value)); 34 | } 35 | 36 | if (fromEnd) 37 | _value = ~value; 38 | else 39 | _value = value; 40 | } 41 | 42 | // The following private constructors mainly created for perf reason to avoid the checks 43 | private Index(int value) 44 | { 45 | _value = value; 46 | } 47 | 48 | /// Create an Index pointing at first element. 49 | public static Index Start => new Index(0); 50 | 51 | /// Create an Index pointing at beyond last element. 52 | public static Index End => new Index(~0); 53 | 54 | /// Create an Index from the start at the position indicated by the value. 55 | /// The index value from the start. 56 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 57 | public static Index FromStart(int value) 58 | { 59 | if (value < 0) 60 | { 61 | throw new ArgumentOutOfRangeException(nameof(value)); 62 | } 63 | 64 | return new Index(value); 65 | } 66 | 67 | /// Create an Index from the end at the position indicated by the value. 68 | /// The index value from the end. 69 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 70 | public static Index FromEnd(int value) 71 | { 72 | if (value < 0) 73 | { 74 | throw new ArgumentOutOfRangeException(nameof(value)); 75 | } 76 | 77 | return new Index(~value); 78 | } 79 | 80 | /// Returns the index value. 81 | public int Value 82 | { 83 | get 84 | { 85 | if (_value < 0) 86 | return ~_value; 87 | else 88 | return _value; 89 | } 90 | } 91 | 92 | /// Indicates whether the index is from the start or the end. 93 | public bool IsFromEnd => _value < 0; 94 | 95 | /// Calculate the offset from the start using the giving collection length. 96 | /// The length of the collection that the Index will be used with. length has to be a positive value 97 | /// 98 | /// For performance reason, we don't validate the input length parameter and the returned offset value against negative values. 99 | /// we don't validate either the returned offset is greater than the input length. 100 | /// It is expected Index will be used with collections which always have non negative length/count. If the returned offset is negative and 101 | /// then used to index a collection will get out of range exception which will be same affect as the validation. 102 | /// 103 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 104 | public int GetOffset(int length) 105 | { 106 | int offset = _value; 107 | if (IsFromEnd) 108 | { 109 | // offset = length - (~value) 110 | // offset = length + (~(~value) + 1) 111 | // offset = length + value + 1 112 | 113 | offset += length + 1; 114 | } 115 | return offset; 116 | } 117 | 118 | /// Indicates whether the current Index object is equal to another object of the same type. 119 | /// An object to compare with this object 120 | public override bool Equals(object value) => value is Index && _value == ((Index)value)._value; 121 | 122 | /// Indicates whether the current Index object is equal to another Index object. 123 | /// An object to compare with this object 124 | public bool Equals(Index other) => _value == other._value; 125 | 126 | /// Returns the hash code for this instance. 127 | public override int GetHashCode() => _value; 128 | 129 | /// Converts integer number to an Index. 130 | public static implicit operator Index(int value) => FromStart(value); 131 | 132 | /// Converts the value of the current Index object to its equivalent string representation. 133 | public override string ToString() 134 | { 135 | if (IsFromEnd) 136 | return ToStringFromEnd(); 137 | 138 | return ((uint)Value).ToString(); 139 | } 140 | 141 | private string ToStringFromEnd() 142 | { 143 | var sb = StringBuilderCache.Acquire(11); // 1 for ^ and 10 for longest possible uint value 144 | 145 | sb.Append((uint) Value); 146 | sb.Append('^'); 147 | 148 | return StringBuilderCache.GetStringAndRelease(sb); 149 | } 150 | } 151 | } 152 | #endif -------------------------------------------------------------------------------- /src/Contrib.Bcl.Ranges/Range.cs: -------------------------------------------------------------------------------- 1 | // Licensed to the .NET Foundation under one or more agreements. 2 | // The .NET Foundation licenses this file to you under the MIT license. 3 | // See the LICENSE file in the project root for more information. 4 | 5 | #if NO_RANGES_SUPPORT 6 | using System.Runtime.CompilerServices; 7 | 8 | namespace System 9 | { 10 | /// Represent a range has start and end indexes. 11 | /// 12 | /// Range is used by the C# compiler to support the range syntax. 13 | /// 14 | /// int[] someArray = new int[5] { 1, 2, 3, 4, 5 }; 15 | /// int[] subArray1 = someArray[0..2]; // { 1, 2 } 16 | /// int[] subArray2 = someArray[1..^0]; // { 2, 3, 4, 5 } 17 | /// 18 | /// 19 | public readonly struct Range : IEquatable 20 | { 21 | /// Represent the inclusive start index of the Range. 22 | public Index Start { get; } 23 | 24 | /// Represent the exclusive end index of the Range. 25 | public Index End { get; } 26 | 27 | /// Construct a Range object using the start and end indexes. 28 | /// Represent the inclusive start index of the range. 29 | /// Represent the exclusive end index of the range. 30 | public Range(Index start, Index end) 31 | { 32 | Start = start; 33 | End = end; 34 | } 35 | 36 | /// Indicates whether the current Range object is equal to another object of the same type. 37 | /// An object to compare with this object 38 | public override bool Equals(object value) => 39 | value is Range r && 40 | r.Start.Equals(Start) && 41 | r.End.Equals(End); 42 | 43 | /// Indicates whether the current Range object is equal to another Range object. 44 | /// An object to compare with this object 45 | public bool Equals(Range other) => other.Start.Equals(Start) && other.End.Equals(End); 46 | 47 | /// Returns the hash code for this instance. 48 | public override int GetHashCode() 49 | { 50 | return Combine(Start.GetHashCode(), End.GetHashCode()); 51 | } 52 | 53 | /// Converts the value of the current Range object to its equivalent string representation. 54 | public override string ToString() 55 | { 56 | var sb = StringBuilderCache.Acquire(2 + (2 * 11)); // 2 for "..", then for each index 1 for '^' and 10 for longest possible uint 57 | 58 | if (Start.IsFromEnd) 59 | { 60 | sb.Append('^'); 61 | } 62 | 63 | sb.Append((uint)Start.Value); 64 | sb.Append(".."); 65 | 66 | if (End.IsFromEnd) 67 | { 68 | sb.Append('^'); 69 | } 70 | 71 | sb.Append((uint) End.Value); 72 | 73 | return StringBuilderCache.GetStringAndRelease(sb); 74 | } 75 | 76 | /// Create a Range object starting from start index to the end of the collection. 77 | public static Range StartAt(Index start) => new Range(start, Index.End); 78 | 79 | /// Create a Range object starting from first element in the collection to the end Index. 80 | public static Range EndAt(Index end) => new Range(Index.Start, end); 81 | 82 | /// Create a Range object starting from first element to the end. 83 | public static Range All => new Range(Index.Start, Index.End); 84 | 85 | /// Calculate the start offset and length of range object using a collection length. 86 | /// The length of the collection that the range will be used with. length has to be a positive value. 87 | /// 88 | /// For performance reason, we don't validate the input length parameter against negative values. 89 | /// It is expected Range will be used with collections which always have non negative length/count. 90 | /// We validate the range is inside the length scope though. 91 | /// 92 | [MethodImpl(MethodImplOptions.AggressiveInlining)] 93 | public (int Offset, int Length) GetOffsetAndLength(int length) 94 | { 95 | int start; 96 | Index startIndex = Start; 97 | if (startIndex.IsFromEnd) 98 | start = length - startIndex.Value; 99 | else 100 | start = startIndex.Value; 101 | 102 | int end; 103 | Index endIndex = End; 104 | if (endIndex.IsFromEnd) 105 | end = length - endIndex.Value; 106 | else 107 | end = endIndex.Value; 108 | 109 | if ((uint)end > (uint)length || (uint)start > (uint)end) 110 | { 111 | throw new ArgumentOutOfRangeException(); 112 | } 113 | 114 | return (start, end - start); 115 | } 116 | 117 | static int Combine(T1 value1, T2 value2) 118 | { 119 | return HashCode.Combine(value1?.GetHashCode() ?? 0, value2?.GetHashCode() ?? 0); 120 | } 121 | } 122 | } 123 | #endif -------------------------------------------------------------------------------- /src/Contrib.Bcl.Ranges/RuntimeHelpers.cs: -------------------------------------------------------------------------------- 1 | // Licensed to the .NET Foundation under one or more agreements. 2 | // The .NET Foundation licenses this file to you under the MIT license. 3 | // See the LICENSE file in the project root for more information. 4 | 5 | #if NO_RANGES_SUPPORT 6 | using System; 7 | 8 | namespace System.Runtime.CompilerServices 9 | { 10 | public static partial class RuntimeHelpers 11 | { 12 | public static int get_IndexerExtension(this int[] array, Index index) => 13 | index.IsFromEnd ? array[array.Length - index.Value] : array[index.Value]; 14 | 15 | public static int get_IndexerExtension(this Span span, Index index) => 16 | index.IsFromEnd ? span[span.Length - index.Value] : span[index.Value]; 17 | 18 | public static char get_IndexerExtension(this string s, Index index) => 19 | index.IsFromEnd ? s[s.Length - index.Value] : s[index.Value]; 20 | 21 | public static Span get_IndexerExtension(this int[] array, Range range) => 22 | array.Slice(range); 23 | 24 | public static Span get_IndexerExtension(this Span span, Range range) => 25 | span.Slice(range); 26 | 27 | public static string get_IndexerExtension(this string s, Range range) => 28 | s.Substring(range); 29 | 30 | public static Span Slice(this T[] array, Range range) 31 | => array.AsSpan().Slice(range); 32 | 33 | public static Span Slice(this Span span, Range range) 34 | { 35 | var (start, length) = GetStartAndLength(range, span.Length); 36 | return span.Slice(start, length); 37 | } 38 | 39 | public static string Substring(this string s, Range range) 40 | { 41 | var (start, length) = GetStartAndLength(range, s.Length); 42 | return s.Substring(start, length); 43 | } 44 | 45 | private static (int start, int length) GetStartAndLength(Range range, int entityLength) 46 | { 47 | var start = range.Start.IsFromEnd ? entityLength - range.Start.Value : range.Start.Value; 48 | var end = range.End.IsFromEnd ? entityLength - range.End.Value : range.End.Value; 49 | var length = end - start; 50 | 51 | return (start, length); 52 | } 53 | 54 | /// 55 | /// Slices the specified array using the specified range. 56 | /// 57 | public static T[] GetSubArray(T[] array, Range range) 58 | { 59 | if (array == null) 60 | { 61 | throw new ArgumentNullException(nameof(array)); 62 | } 63 | 64 | (int offset, int length) = range.GetOffsetAndLength(array.Length); 65 | 66 | if (default(T) != null || typeof(T[]) == array.GetType()) 67 | { 68 | // We know the type of the array to be exactly T[]. 69 | 70 | if (length == 0) 71 | { 72 | return Array.Empty(); 73 | } 74 | 75 | var dest = new T[length]; 76 | Array.Copy(array, offset, dest, 0, length); 77 | return dest; 78 | } 79 | else 80 | { 81 | // The array is actually a U[] where U:T. 82 | T[] dest = (T[])Array.CreateInstance(array.GetType().GetElementType(), length); 83 | Array.Copy(array, offset, dest, 0, length); 84 | return dest; 85 | } 86 | } 87 | } 88 | } 89 | #endif -------------------------------------------------------------------------------- /src/Contrib.Bcl.Ranges/StringBuilderCache.cs: -------------------------------------------------------------------------------- 1 | // Licensed to the .NET Foundation under one or more agreements. 2 | // The .NET Foundation licenses this file to you under the MIT license. 3 | // See the LICENSE file in the project root for more information. 4 | 5 | #if NO_RANGES_SUPPORT 6 | using System.Text; 7 | 8 | namespace System 9 | { 10 | /// Provide a cached reusable instance of stringbuilder per thread. 11 | internal static class StringBuilderCache 12 | { 13 | // The value 360 was chosen in discussion with performance experts as a compromise between using 14 | // as litle memory per thread as possible and still covering a large part of short-lived 15 | // StringBuilder creations on the startup path of VS designers. 16 | private const int MaxBuilderSize = 360; 17 | private const int DefaultCapacity = 16; // == StringBuilder.DefaultCapacity 18 | 19 | // WARNING: We allow diagnostic tools to directly inspect this member (t_cachedInstance). 20 | // See https://github.com/dotnet/corert/blob/master/Documentation/design-docs/diagnostics/diagnostics-tools-contract.md for more details. 21 | // Please do not change the type, the name, or the semantic usage of this member without understanding the implication for tools. 22 | // Get in touch with the diagnostics team if you have questions. 23 | [ThreadStatic] 24 | private static StringBuilder t_cachedInstance; 25 | 26 | /// Get a StringBuilder for the specified capacity. 27 | /// If a StringBuilder of an appropriate size is cached, it will be returned and the cache emptied. 28 | public static StringBuilder Acquire(int capacity = DefaultCapacity) 29 | { 30 | if (capacity <= MaxBuilderSize) 31 | { 32 | StringBuilder sb = t_cachedInstance; 33 | if (sb != null) 34 | { 35 | // Avoid stringbuilder block fragmentation by getting a new StringBuilder 36 | // when the requested size is larger than the current capacity 37 | if (capacity <= sb.Capacity) 38 | { 39 | t_cachedInstance = null; 40 | sb.Clear(); 41 | return sb; 42 | } 43 | } 44 | } 45 | 46 | return new StringBuilder(capacity); 47 | } 48 | 49 | /// Place the specified builder in the cache if it is not too big. 50 | public static void Release(StringBuilder sb) 51 | { 52 | if (sb.Capacity <= MaxBuilderSize) 53 | { 54 | t_cachedInstance = sb; 55 | } 56 | } 57 | 58 | /// ToString() the stringbuilder, Release it to the cache, and return the resulting string. 59 | public static string GetStringAndRelease(StringBuilder sb) 60 | { 61 | string result = sb.ToString(); 62 | Release(sb); 63 | return result; 64 | } 65 | } 66 | } 67 | #endif -------------------------------------------------------------------------------- /src/Directory.Build.props: -------------------------------------------------------------------------------- 1 | 2 | 3 | 1.0.0 4 | 5 | -------------------------------------------------------------------------------- /src/global.json: -------------------------------------------------------------------------------- 1 | { 2 | "sdk": { 3 | "version": "3.0.100" 4 | }, 5 | "msbuild-sdks": { 6 | "MSBuild.Sdk.Extras": "2.0.41" 7 | } 8 | } -------------------------------------------------------------------------------- /src/refs/Contrib.Bcl.Ranges.Ref/Contrib.Bcl.Ranges.Ref.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | net461;net47;netstandard2.0;netstandard2.1 5 | 6 | 7 | $(DefineConstants),NO_RANGES_SUPPORT 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | --------------------------------------------------------------------------------