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fix(core): Streamlines text encoding (#407)

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- [X] Streamlines text encoding
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Kamron Batman 2021-01-13 18:56:32 -08:00 • committed by GitHub
parent 5631c1da6d
commit 211c2ba8ee
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25 changed files with 274 additions and 137 deletions
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Projects/Server/Text/StringHelpers.cs Normal file
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/*************************************************************************
* ModernUO *
* Copyright (C) 2019-2020 - ModernUO Development Team *
* Email: hi@modernuo.com *
* File: StringHelpers.cs *
* *
* This program is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/>. *
*************************************************************************/
using System;
using System.Buffers;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace Server
{
public static class StringHelpers
{
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static string DefaultIfNullOrEmpty(this string value, string def) =>
string.IsNullOrWhiteSpace(value) ? def : value;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static void Remove(
this ReadOnlySpan<char> a,
ReadOnlySpan<char> b,
StringComparison comparison,
Span<char> buffer,
out int size
)
{
size = 0;
if (a == null || a.Length == 0)
{
return;
}
var sliced = a;
while (true)
{
var indexOf = sliced.IndexOf(b, comparison);
if (indexOf == -1)
{
indexOf = sliced.Length;
}
if (size + indexOf > buffer.Length)
{
throw new OutOfMemoryException(nameof(buffer));
}
sliced.Slice(0, indexOf).CopyTo(buffer.Slice(size));
size += indexOf;
if (indexOf == sliced.Length)
{
break;
}
sliced = sliced.Slice(indexOf + 1);
}
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static string Remove(this ReadOnlySpan<char> a, ReadOnlySpan<char> b, StringComparison comparison)
{
if (a == null)
{
return null;
}
if (a.Length == 0)
{
return "";
}
Span<char> span = a.Length < 1024 ? stackalloc char[a.Length] : null;
char[] chrs;
if (span == null)
{
chrs = ArrayPool<char>.Shared.Rent(a.Length);
span = chrs.AsSpan();
}
else
{
chrs = null;
}
a.Remove(b, comparison, span, out var size);
var str = span.Slice(0, size).ToString();
if (chrs != null)
{
ArrayPool<char>.Shared.Return(chrs);
}
return str;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static string Capitalize(this string value)
{
if (string.IsNullOrEmpty(value))
{
return value;
}
Span<char> span = value.Length < 1024 ? stackalloc char[value.Length] : null;
char[] chrs;
if (span == null)
{
chrs = ArrayPool<char>.Shared.Rent(value.Length);
span = chrs.AsSpan();
}
else
{
chrs = null;
}
var sliced = value.AsSpan();
// Copy over the previous span
sliced.CopyTo(span);
var index = 0;
while (true)
{
// Special case for titles - words that don't get capitalized
if (sliced.InsensitiveStartsWith("the "))
{
sliced = sliced.Slice(4);
index += 4;
continue;
}
var indexOf = sliced.IndexOf(' ');
span[index] = char.ToUpperInvariant(sliced[0]);
if (indexOf == -1)
{
break;
}
if (indexOf == sliced.Length - 1)
{
break;
}
sliced = sliced.Slice(indexOf + 1);
index += indexOf + 1;
}
var str = span.ToString();
if (chrs != null)
{
ArrayPool<char>.Shared.Return(chrs);
}
return str;
}
public static List<string> Wrap(this string value, int perLine, int maxLines)
{
if ((value = value?.Trim() ?? "").Length <= 0)
{
return null;
}
var span = value.AsSpan();
var list = new List<string>(maxLines);
var lineLength = 0;
while (span.Length > 0)
{
var spaceIndex = span.Slice(lineLength).IndexOf(' ');
if (spaceIndex == -1)
{
spaceIndex = span.Length; // End of the string
}
var newLineLength = lineLength + spaceIndex;
if (newLineLength == perLine || newLineLength == span.Length)
{
list.Add(span.Slice(0, newLineLength).ToString());
if (list.Count == maxLines || newLineLength == span.Length)
{
break;
}
span = span.Slice(newLineLength + 1);
lineLength = 0;
}
else if (newLineLength < perLine)
{
lineLength = newLineLength + 1;
}
else if (lineLength > 0 && lineLength <= perLine)
{
list.Add(span.Slice(0, lineLength - 1).ToString());
if (list.Count == maxLines)
{
break;
}
span = span.Slice(lineLength);
lineLength = spaceIndex;
}
else
{
lineLength = newLineLength;
var index = 0;
while (index < lineLength)
{
lineLength -= perLine;
var length = perLine - (span[index] == ' ' ? 1 : 0);
list.Add(span.Slice(index, length).ToString());
if (list.Count == maxLines)
{
break;
}
index += perLine;
}
span = span.Slice(newLineLength - lineLength);
}
}
return list;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static int IndexOfTerminator(this ReadOnlySpan<byte> buffer, int sizeT) =>
sizeT switch
{
2 => MemoryMarshal.Cast<byte, char>(buffer).IndexOf((char)0) * 2,
4 => MemoryMarshal.Cast<byte, uint>(buffer).IndexOf((uint)0) * 4,
_ => buffer.IndexOf((byte)0)
};
}
}