404 lines
21 KiB
C#
404 lines
21 KiB
C#
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using System;
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using Unity.Collections.LowLevel.Unsafe;
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namespace Unity.Collections
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{
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/// <summary>
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/// Provides extension methods for FixedString*N*.
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/// </summary>
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[BurstCompatible]
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public unsafe static partial class FixedStringMethods
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{
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/// <summary>
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/// Returns the index of the first occurrence of a byte sequence in this string.
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/// </summary>
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/// <typeparam name="T">A FixedString*N* type.</typeparam>
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/// <param name="fs">A string to search.</param>
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/// <param name="bytes">A byte sequence to search for within this string.</param>
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/// <param name="bytesLen">The number of bytes in the byte sequence.</param>
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/// <returns>The index of the first occurrence of the byte sequence in this string. Returns -1 if no occurrence is found.</returns>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(FixedString128Bytes) })]
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public static int IndexOf<T>(ref this T fs, byte* bytes, int bytesLen)
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where T : struct, INativeList<byte>, IUTF8Bytes
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{
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var dst = fs.GetUnsafePtr();
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var dstLen = fs.Length;
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for (var i = 0; i <= dstLen - bytesLen; ++i)
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{
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for (var j = 0; j < bytesLen; ++j)
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if (dst[i + j] != bytes[j])
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goto end_of_loop;
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return i;
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end_of_loop : {}
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}
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return -1;
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}
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/// <summary>
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/// Returns the index of the first occurrence of a byte sequence within a subrange of this string.
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/// </summary>
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/// <typeparam name="T">A FixedString*N* type.</typeparam>
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/// <param name="fs">A string to search.</param>
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/// <param name="bytes">A byte sequence to search for within this string.</param>
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/// <param name="bytesLen">The number of bytes in the byte sequence.</param>
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/// <param name="startIndex">The first index in this string to consider as the first byte of the byte sequence.</param>
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/// <param name="distance">The last index in this string to consider as the first byte of the byte sequence.</param>
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/// <returns>The index of the first occurrence of the byte sequence in this string. Returns -1 if no occurrence is found.</returns>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(FixedString128Bytes) })]
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public static int IndexOf<T>(ref this T fs, byte* bytes, int bytesLen, int startIndex, int distance = Int32.MaxValue)
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where T : struct, INativeList<byte>, IUTF8Bytes
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{
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var dst = fs.GetUnsafePtr();
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var dstLen = fs.Length;
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var searchrange = Math.Min(distance - 1, dstLen - bytesLen);
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for (var i = startIndex; i <= searchrange; ++i)
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{
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for (var j = 0; j < bytesLen; ++j)
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if (dst[i + j] != bytes[j])
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goto end_of_loop;
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return i;
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end_of_loop : {}
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}
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return -1;
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}
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/// <summary>
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/// Returns the index of the first occurrence of a substring within this string.
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/// </summary>
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/// <typeparam name="T">A FixedString*N* type.</typeparam>
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/// <typeparam name="T2">A FixedString*N* type.</typeparam>
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/// <param name="fs">A string to search.</param>
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/// <param name="other">A substring to search for within this string.</param>
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/// <returns>The index of the first occurrence of the second string within this string. Returns -1 if no occurrence is found.</returns>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(FixedString128Bytes), typeof(FixedString128Bytes) })]
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public static int IndexOf<T,T2>(ref this T fs, in T2 other)
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where T : struct, INativeList<byte>, IUTF8Bytes
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where T2 : struct, INativeList<byte>, IUTF8Bytes
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{
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ref var oref = ref UnsafeUtilityExtensions.AsRef(in other);
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return fs.IndexOf(oref.GetUnsafePtr(), oref.Length);
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}
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/// <summary>
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/// Returns the index of the first occurrence of a substring within a subrange of this string.
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/// </summary>
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/// <typeparam name="T">A FixedString*N* type.</typeparam>
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/// <typeparam name="T2">A FixedString*N* type.</typeparam>
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/// <param name="fs">A string to search.</param>
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/// <param name="other">A substring to search for within this string.</param>
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/// <param name="startIndex">The first index in this string to consider as an occurrence of the second string.</param>
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/// <param name="distance">The last index in this string to consider as an occurrence of the second string.</param>
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/// <returns>The index of the first occurrence of the substring within this string. Returns -1 if no occurrence is found.</returns>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(FixedString128Bytes), typeof(FixedString128Bytes) })]
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public static int IndexOf<T,T2>(ref this T fs, in T2 other, int startIndex, int distance = Int32.MaxValue)
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where T : struct, INativeList<byte>, IUTF8Bytes
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where T2 : struct, INativeList<byte>, IUTF8Bytes
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{
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ref var oref = ref UnsafeUtilityExtensions.AsRef(in other);
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return fs.IndexOf(oref.GetUnsafePtr(), oref.Length, startIndex, distance);
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}
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/// <summary>
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/// Returns true if a given substring occurs within this string.
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/// </summary>
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/// <typeparam name="T">A FixedString*N* type.</typeparam>
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/// <typeparam name="T2">A FixedString*N* type.</typeparam>
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/// <param name="fs">A string to search.</param>
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/// <param name="other">A substring to search for within this string.</param>
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/// <returns>True if the substring occurs within this string.</returns>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(FixedString128Bytes), typeof(FixedString128Bytes) })]
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public static bool Contains<T,T2>(ref this T fs, in T2 other)
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where T : struct, INativeList<byte>, IUTF8Bytes
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where T2 : struct, INativeList<byte>, IUTF8Bytes
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{
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return fs.IndexOf(in other) != -1;
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}
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/// <summary>
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/// Returns the index of the last occurrence of a byte sequence within this string.
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/// </summary>
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/// <typeparam name="T">A FixedString*N* type.</typeparam>
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/// <param name="fs">A string to search.</param>
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/// <param name="bytes">A byte sequence to search for within this string.</param>
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/// <param name="bytesLen">The number of bytes in the byte sequence.</param>
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/// <returns>The index of the last occurrence of the byte sequence within this string. Returns -1 if no occurrence is found.</returns>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(FixedString128Bytes) })]
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public static int LastIndexOf<T>(ref this T fs, byte* bytes, int bytesLen)
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where T : struct, INativeList<byte>, IUTF8Bytes
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{
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var dst = fs.GetUnsafePtr();
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var dstLen = fs.Length;
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for (var i = dstLen - bytesLen; i >= 0; --i)
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{
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for (var j = 0; j < bytesLen; ++j)
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if (dst[i + j] != bytes[j])
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goto end_of_loop;
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return i;
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end_of_loop : {}
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}
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return -1;
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}
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/// <summary>
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/// Returns the index of the last occurrence of a byte sequence within a subrange of this string.
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/// </summary>
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/// <typeparam name="T">A FixedString*N* type.</typeparam>
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/// <param name="fs">A string to search.</param>
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/// <param name="bytes">A byte sequence to search for within this string.</param>
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/// <param name="bytesLen">The number of bytes in the byte sequence.</param>
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/// <param name="startIndex">The smallest index in this string to consider as the first byte of the byte sequence.</param>
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/// <param name="distance">The greatest index in this string to consider as the first byte of the byte sequence.</param>
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/// <returns>The index of the last occurrence of the byte sequence within this string. Returns -1 if no occurrences found.</returns>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(FixedString128Bytes) })]
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public static int LastIndexOf<T>(ref this T fs, byte* bytes, int bytesLen, int startIndex, int distance = int.MaxValue)
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where T : struct, INativeList<byte>, IUTF8Bytes
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{
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var dst = fs.GetUnsafePtr();
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var dstLen = fs.Length;
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startIndex = Math.Min(dstLen - bytesLen, startIndex);
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var searchrange = Math.Max(0, startIndex - distance);
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for (var i = startIndex; i >= searchrange; --i)
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{
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for (var j = 0; j < bytesLen; ++j)
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if (dst[i + j] != bytes[j])
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goto end_of_loop;
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return i;
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end_of_loop : {}
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}
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return -1;
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}
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/// <summary>
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/// Returns the index of the last occurrence of a substring within this string.
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/// </summary>
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/// <typeparam name="T">A FixedString*N* type.</typeparam>
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/// <typeparam name="T2">A FixedString*N* type.</typeparam>
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/// <param name="fs">A string to search.</param>
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/// <param name="other">A substring to search for in the this string.</param>
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/// <returns>The index of the last occurrence of the substring within this string. Returns -1 if no occurrence is found.</returns>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(FixedString128Bytes), typeof(FixedString128Bytes) })]
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public static int LastIndexOf<T,T2>(ref this T fs, in T2 other)
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where T : struct, INativeList<byte>, IUTF8Bytes
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where T2 : struct, INativeList<byte>, IUTF8Bytes
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{
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ref var oref = ref UnsafeUtilityExtensions.AsRef(in other);
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return fs.LastIndexOf(oref.GetUnsafePtr(), oref.Length);
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}
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/// <summary>
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/// Returns the index of the last occurrence of a substring within a subrange of this string.
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/// </summary>
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/// <typeparam name="T">A FixedString*N* type.</typeparam>
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/// <typeparam name="T2">A FixedString*N* type.</typeparam>
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/// <param name="fs">A string to search.</param>
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/// <param name="other">A substring to search for within this string.</param>
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/// <param name="startIndex">The greatest index in this string to consider as an occurrence of the substring.</param>
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/// <param name="distance">The smallest index in this string to consider as an occurrence of the substring.</param>
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/// <returns>the index of the last occurrence of the substring within the first string. Returns -1 if no occurrence is found.</returns>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(FixedString128Bytes), typeof(FixedString128Bytes) })]
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public static int LastIndexOf<T,T2>(ref this T fs, in T2 other, int startIndex, int distance = Int32.MaxValue)
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where T : struct, INativeList<byte>, IUTF8Bytes
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where T2 : struct, INativeList<byte>, IUTF8Bytes
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{
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ref var oref = ref UnsafeUtilityExtensions.AsRef(in other);
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return fs.LastIndexOf(oref.GetUnsafePtr(), oref.Length, startIndex, distance);
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}
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/// <summary>
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/// Returns the sort position of this string relative to a byte sequence.
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/// </summary>
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/// <typeparam name="T">A FixedString*N* type.</typeparam>
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/// <param name="fs">A string to compare.</param>
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/// <param name="bytes">A byte sequence to compare.</param>
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/// <param name="bytesLen">The number of bytes in the byte sequence.</param>
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/// <returns>A number denoting the sort position of this string relative to the byte sequence:
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///
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/// 0 denotes that this string and byte sequence have the same sort position.<br/>
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/// -1 denotes that this string should be sorted to precede the byte sequence.<br/>
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/// +1 denotes that this string should be sorted to follow the byte sequence.<br/>
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/// </returns>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(FixedString128Bytes) })]
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public static int CompareTo<T>(ref this T fs, byte* bytes, int bytesLen)
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where T : struct, INativeList<byte>, IUTF8Bytes
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{
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var a = fs.GetUnsafePtr();
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var aa = fs.Length;
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int chars = aa < bytesLen ? aa : bytesLen;
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for (var i = 0; i < chars; ++i)
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{
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if (a[i] < bytes[i])
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return -1;
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if (a[i] > bytes[i])
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return 1;
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}
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if (aa < bytesLen)
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return -1;
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if (aa > bytesLen)
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return 1;
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return 0;
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}
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/// <summary>
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/// Returns the sort position of this string relative to another.
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/// </summary>
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/// <typeparam name="T">A FixedString*N* type.</typeparam>
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/// <typeparam name="T2">A FixedString*N* type.</typeparam>
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/// <param name="fs">A string to compare.</param>
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/// <param name="other">Another string to compare.</param>
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/// <returns>A number denoting the relative sort position of the strings:
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///
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/// 0 denotes that the strings have the same sort position.<br/>
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/// -1 denotes that this string should be sorted to precede the other.<br/>
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/// +1 denotes that this first string should be sorted to follow the other.<br/>
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/// </returns>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(FixedString128Bytes), typeof(FixedString128Bytes) })]
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public static int CompareTo<T,T2>(ref this T fs, in T2 other)
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where T : struct, INativeList<byte>, IUTF8Bytes
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where T2 : struct, INativeList<byte>, IUTF8Bytes
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{
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ref var oref = ref UnsafeUtilityExtensions.AsRef(in other);
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return fs.CompareTo(oref.GetUnsafePtr(), oref.Length);
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}
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/// <summary>
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/// Returns true if this string and a byte sequence are equal (meaning they have the same length and content).
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/// </summary>
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/// <typeparam name="T">A FixedString*N* type.</typeparam>
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/// <param name="fs">A string to compare for equality.</param>
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/// <param name="bytes">A sequence of bytes to compare for equality.</param>
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/// <param name="bytesLen">The number of bytes in the byte sequence.</param>
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/// <returns>True if this string and the byte sequence have the same length and if this string's character bytes match the byte sequence.</returns>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(FixedString128Bytes) })]
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public static bool Equals<T>(ref this T fs, byte* bytes, int bytesLen)
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where T : struct, INativeList<byte>, IUTF8Bytes
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{
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var a = fs.GetUnsafePtr();
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var aa = fs.Length;
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if (aa != bytesLen)
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return false;
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if (a == bytes)
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return true;
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return fs.CompareTo(bytes, bytesLen) == 0;
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}
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/// <summary>
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/// Returns true if this string is equal to another.
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/// </summary>
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/// <typeparam name="T">A FixedString*N* type.</typeparam>
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/// <typeparam name="T2">A FixedString*N* type.</typeparam>
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/// <param name="fs">A string to compare for equality.</param>
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/// <param name="other">Another string to compare for equality.</param>
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/// <returns>true if the two strings have the same length and matching content.</returns>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(FixedString128Bytes), typeof(FixedString128Bytes) })]
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public static bool Equals<T,T2>(ref this T fs, in T2 other)
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where T : struct, INativeList<byte>, IUTF8Bytes
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where T2 : struct, INativeList<byte>, IUTF8Bytes
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{
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ref var oref = ref UnsafeUtilityExtensions.AsRef(in other);
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return fs.Equals(oref.GetUnsafePtr(), oref.Length);
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}
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/// <summary>
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/// Returns the Unicode.Rune at an index of this string.
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/// </summary>
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/// <typeparam name="T">A FixedString*N* type.</typeparam>
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/// <param name="fs">A string to read.</param>
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/// <param name="index">A reference to an index in bytes (not characters).</param>
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/// <returns>The Unicode.Rune (character) which starts at the byte index. Returns Unicode.BadRune
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/// if the byte(s) at the index do not form a valid UTF-8 encoded character.</returns>
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[BurstCompatible(GenericTypeArguments = new[] { typeof(FixedString128Bytes) })]
|
||
|
|
public static Unicode.Rune Peek<T>(ref this T fs, int index)
|
||
|
|
where T : struct, INativeList<byte>, IUTF8Bytes
|
||
|
|
{
|
||
|
|
if (index >= fs.Length)
|
||
|
|
return Unicode.BadRune;
|
||
|
|
Unicode.Utf8ToUcs(out var rune, fs.GetUnsafePtr(), ref index, fs.Capacity);
|
||
|
|
return rune;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Returns the Unicode.Rune at an index of this string. Increments the index to the position of the next character.
|
||
|
|
/// </summary>
|
||
|
|
/// <typeparam name="T">A FixedString*N* type.</typeparam>
|
||
|
|
/// <param name="fs">A string to read.</param>
|
||
|
|
/// <param name="index">A reference to an index in bytes (not characters). Incremented by 1 to 4 depending upon the UTF-8 encoded size of the character read.</param>
|
||
|
|
/// <returns>The character (as a `Unicode.Rune`) which starts at the byte index. Returns `Unicode.BadRune`
|
||
|
|
/// if the byte(s) at the index do not form a valid UTF-8 encoded character.</returns>
|
||
|
|
[BurstCompatible(GenericTypeArguments = new[] { typeof(FixedString128Bytes) })]
|
||
|
|
public static Unicode.Rune Read<T>(ref this T fs, ref int index)
|
||
|
|
where T : struct, INativeList<byte>, IUTF8Bytes
|
||
|
|
{
|
||
|
|
if (index >= fs.Length)
|
||
|
|
return Unicode.BadRune;
|
||
|
|
Unicode.Utf8ToUcs(out var rune, fs.GetUnsafePtr(), ref index, fs.Capacity);
|
||
|
|
return rune;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Writes a Unicode.Rune at an index of this string. Increments the index to the position of the next character.
|
||
|
|
/// </summary>
|
||
|
|
/// <typeparam name="T">A FixedString*N* type.</typeparam>
|
||
|
|
/// <param name="fs">A string to modify.</param>
|
||
|
|
/// <param name="index">A reference to an index in bytes (not characters). Incremented by 1 to 4 depending upon the UTF-8 encoded size of the character written.</param>
|
||
|
|
/// <param name="rune">A rune to write to the string, encoded as UTF-8.</param>
|
||
|
|
/// <returns>FormatError.None if successful. Returns FormatError.Overflow if the index is invalid or if there is not enough space to store the encoded rune.</returns>
|
||
|
|
[BurstCompatible(GenericTypeArguments = new[] { typeof(FixedString128Bytes) })]
|
||
|
|
public static FormatError Write<T>(ref this T fs, ref int index, Unicode.Rune rune)
|
||
|
|
where T : struct, INativeList<byte>, IUTF8Bytes
|
||
|
|
{
|
||
|
|
var err = Unicode.UcsToUtf8(fs.GetUnsafePtr(), ref index, fs.Capacity, rune);
|
||
|
|
if (err != ConversionError.None)
|
||
|
|
return FormatError.Overflow;
|
||
|
|
return FormatError.None;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Returns a copy of this string as a managed string.
|
||
|
|
/// </summary>
|
||
|
|
/// <typeparam name="T">A FixedString*N* type.</typeparam>
|
||
|
|
/// <param name="fs">A string to copy.</param>
|
||
|
|
/// <returns>A copy of this string as a managed string.</returns>
|
||
|
|
[NotBurstCompatible]
|
||
|
|
public static String ConvertToString<T>(ref this T fs)
|
||
|
|
where T : struct, INativeList<byte>, IUTF8Bytes
|
||
|
|
{
|
||
|
|
var c = stackalloc char[fs.Length * 2];
|
||
|
|
int length = 0;
|
||
|
|
Unicode.Utf8ToUtf16(fs.GetUnsafePtr(), fs.Length, c, out length, fs.Length * 2);
|
||
|
|
return new String(c, 0, length);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Returns a hash code of this string.
|
||
|
|
/// </summary>
|
||
|
|
/// <typeparam name="T">A FixedString*N* type.</typeparam>
|
||
|
|
/// <param name="fs">A string to get a hash code of.</param>
|
||
|
|
/// <returns>A hash code of this string.</returns>
|
||
|
|
[BurstCompatible(GenericTypeArguments = new[] { typeof(FixedString128Bytes) })]
|
||
|
|
public static int ComputeHashCode<T>(ref this T fs)
|
||
|
|
where T : struct, INativeList<byte>, IUTF8Bytes
|
||
|
|
{
|
||
|
|
return (int)CollectionHelper.Hash(fs.GetUnsafePtr(), fs.Length);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Returns the effective size in bytes of this string.
|
||
|
|
/// </summary>
|
||
|
|
/// <remarks>
|
||
|
|
/// "Effective size" is `Length + 3`, the number of bytes you need to copy when serializing the string.
|
||
|
|
/// (The plus 3 accounts for the null-terminator byte and the 2 bytes that store the Length).
|
||
|
|
///
|
||
|
|
/// Useful for checking whether this string will fit in the space of a smaller FixedString*N*.
|
||
|
|
/// </remarks>
|
||
|
|
/// <typeparam name="T">A FixedString*N* type.</typeparam>
|
||
|
|
/// <param name="fs">A string to get the effective size of.</param>
|
||
|
|
/// <returns>The effective size in bytes of this string.</returns>
|
||
|
|
[BurstCompatible(GenericTypeArguments = new[] { typeof(FixedString128Bytes) })]
|
||
|
|
public static int EffectiveSizeOf<T>(ref this T fs)
|
||
|
|
where T : struct, INativeList<byte>, IUTF8Bytes
|
||
|
|
{
|
||
|
|
return sizeof(ushort) + fs.Length + 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|