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StringUtils.cs
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146 lines (127 loc) · 4.62 KB
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// Unity C# reference source
// Copyright (c) Unity Technologies. For terms of use, see
// https://unity3d.com/legal/licenses/Unity_Reference_Only_License
using System;
using System.Linq;
using System.Text;
namespace UnityEngine.UIElements
{
internal static class StringUtils
{
public unsafe static int LevenshteinDistance(string s, string t)
{
int n = s.Length;
int m = t.Length;
if (n == 0)
return m;
if (m == 0)
return n;
int xSize = n + 1;
int ySize = m + 1;
int* d = stackalloc int[xSize * ySize];
for (int x = 0; x <= n; x++)
d[ySize * x] = x;
for (int y = 0; y <= m; y++)
d[y] = y;
for (int y = 1; y <= m; y++)
{
for (int x = 1; x <= n; x++)
{
if (s[x - 1] == t[y - 1])
d[ySize * x + y] = d[ySize * (x - 1) + y - 1]; // no operation
else
d[ySize * x + y] = Math.Min(Math.Min(
d[ySize * (x - 1) + y] + 1, // a deletion
d[ySize * x + y - 1] + 1), // an insertion
d[ySize * (x - 1) + y - 1] + 1 // a substitution
);
}
}
return d[ySize * n + m];
}
}
internal static class StringUtilsExtensions
{
private static readonly char NoDelimiter = '\0'; //invalid character
public static string ToPascalCase(this string text)
{
return ConvertCase(text, NoDelimiter, char.ToUpperInvariant, char.ToUpperInvariant);
}
public static string ToCamelCase(this string text)
{
return ConvertCase(text, NoDelimiter, char.ToLowerInvariant, char.ToUpperInvariant);
}
public static string ToKebabCase(this string text)
{
return ConvertCase(text, '-', char.ToLowerInvariant, char.ToLowerInvariant);
}
public static string ToTrainCase(this string text)
{
return ConvertCase(text, '-', char.ToUpperInvariant, char.ToUpperInvariant);
}
public static string ToSnakeCase(this string text)
{
return ConvertCase(text, '_', char.ToLowerInvariant, char.ToLowerInvariant);
}
private static readonly char[] WordDelimiters = { ' ', '-', '_' };
private static string ConvertCase(string text,
char outputWordDelimiter,
Func<char, char> startOfStringCaseHandler,
Func<char, char> middleStringCaseHandler)
{
if (text == null)
{
throw new ArgumentNullException(nameof(text));
}
var builder = new StringBuilder();
bool startOfString = true;
bool startOfWord = true;
bool outputDelimiter = true;
for (int i = 0; i < text.Length; i++)
{
char c = text[i];
if (WordDelimiters.Contains(c))
{
if (c == outputWordDelimiter)
{
builder.Append(outputWordDelimiter);
//we disable the delimiter insertion
outputDelimiter = false;
}
startOfWord = true;
}
else if (!char.IsLetterOrDigit(c))
{
startOfString = true;
startOfWord = true;
}
else
{
if (startOfWord || char.IsUpper(c))
{
if (startOfString)
{
builder.Append(startOfStringCaseHandler(c));
}
else
{
if (outputDelimiter && outputWordDelimiter != NoDelimiter)
{
builder.Append(outputWordDelimiter);
}
builder.Append(middleStringCaseHandler(c));
outputDelimiter = true;
}
startOfString = false;
startOfWord = false;
}
else
{
builder.Append(c);
}
}
}
return builder.ToString();
}
}
}