587 lines
19 KiB
C#
587 lines
19 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Runtime.InteropServices;
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using System.Text;
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namespace UnityEngine.InputSystem.Utilities
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{
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internal static class StringHelpers
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{
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/// <summary>
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/// For every character in <paramref name="str"/> that is contained in <paramref name="chars"/>, replace it
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/// by the corresponding character in <paramref name="replacements"/> preceded by a backslash.
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/// </summary>
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public static string Escape(this string str, string chars = "\n\t\r\\\"", string replacements = "ntr\\\"")
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{
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if (str == null)
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return null;
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// Scan for characters that need escaping. If there's none, just return
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// string as is.
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var hasCharacterThatNeedsEscaping = false;
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foreach (var ch in str)
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{
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if (chars.Contains(ch))
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{
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hasCharacterThatNeedsEscaping = true;
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break;
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}
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}
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if (!hasCharacterThatNeedsEscaping)
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return str;
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var builder = new StringBuilder();
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foreach (var ch in str)
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{
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var index = chars.IndexOf(ch);
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if (index == -1)
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{
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builder.Append(ch);
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}
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else
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{
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builder.Append('\\');
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builder.Append(replacements[index]);
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}
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}
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return builder.ToString();
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}
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public static string Unescape(this string str, string chars = "ntr\\\"", string replacements = "\n\t\r\\\"")
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{
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if (str == null)
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return str;
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// If there's no backslashes in the string, there's nothing to unescape.
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if (!str.Contains('\\'))
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return str;
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var builder = new StringBuilder();
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for (var i = 0; i < str.Length; ++i)
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{
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var ch = str[i];
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if (ch == '\\' && i < str.Length - 2)
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{
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++i;
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ch = str[i];
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var index = chars.IndexOf(ch);
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if (index != -1)
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builder.Append(replacements[index]);
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else
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builder.Append(ch);
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}
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else
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{
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builder.Append(ch);
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}
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}
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return builder.ToString();
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}
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public static bool Contains(this string str, char ch)
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{
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if (str == null)
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return false;
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return str.IndexOf(ch) != -1;
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}
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public static bool Contains(this string str, string text, StringComparison comparison)
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{
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if (str == null)
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return false;
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return str.IndexOf(text, comparison) != -1;
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}
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public static string GetPlural(this string str)
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{
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if (str == null)
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throw new ArgumentNullException(nameof(str));
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switch (str)
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{
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case "Mouse": return "Mice";
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case "mouse": return "mice";
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case "Axis": return "Axes";
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case "axis": return "axes";
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}
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return str + 's';
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}
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public static string NicifyMemorySize(long numBytes)
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{
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// Gigabytes.
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if (numBytes > 1024 * 1024 * 1024)
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{
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var gb = numBytes / (1024 * 1024 * 1024);
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var remainder = (numBytes % (1024 * 1024 * 1024)) / 1.0f;
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return $"{gb + remainder} GB";
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}
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// Megabytes.
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if (numBytes > 1024 * 1024)
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{
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var mb = numBytes / (1024 * 1024);
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var remainder = (numBytes % (1024 * 1024)) / 1.0f;
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return $"{mb + remainder} MB";
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}
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// Kilobytes.
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if (numBytes > 1024)
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{
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var kb = numBytes / 1024;
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var remainder = (numBytes % 1024) / 1.0f;
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return $"{kb + remainder} KB";
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}
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// Bytes.
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return $"{numBytes} Bytes";
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}
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public static bool FromNicifiedMemorySize(string text, out long result, long defaultMultiplier = 1)
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{
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text = text.Trim();
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var multiplier = defaultMultiplier;
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if (text.EndsWith("MB", StringComparison.InvariantCultureIgnoreCase))
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{
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multiplier = 1024 * 1024;
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text = text.Substring(0, text.Length - 2);
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}
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else if (text.EndsWith("GB", StringComparison.InvariantCultureIgnoreCase))
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{
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multiplier = 1024 * 1024 * 1024;
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text = text.Substring(0, text.Length - 2);
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}
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else if (text.EndsWith("KB", StringComparison.InvariantCultureIgnoreCase))
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{
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multiplier = 1024;
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text = text.Substring(0, text.Length - 2);
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}
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else if (text.EndsWith("Bytes", StringComparison.InvariantCultureIgnoreCase))
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{
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multiplier = 1;
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text = text.Substring(0, text.Length - "Bytes".Length);
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}
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if (!long.TryParse(text, out var num))
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{
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result = default;
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return false;
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}
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result = num * multiplier;
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return true;
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}
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public static int CountOccurrences(this string str, char ch)
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{
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if (str == null)
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return 0;
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var length = str.Length;
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var index = 0;
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var count = 0;
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while (index < length)
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{
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var nextIndex = str.IndexOf(ch, index);
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if (nextIndex == -1)
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break;
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++count;
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index = nextIndex + 1;
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}
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return count;
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}
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public static IEnumerable<Substring> Tokenize(this string str)
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{
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var pos = 0;
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var length = str.Length;
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while (pos < length)
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{
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while (pos < length && char.IsWhiteSpace(str[pos]))
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++pos;
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if (pos == length)
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break;
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if (str[pos] == '"')
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{
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++pos;
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var endPos = pos;
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while (endPos < length && str[endPos] != '\"')
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{
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// Doesn't recognize control sequences but allows escaping double quotes.
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if (str[endPos] == '\\' && endPos < length - 1)
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++endPos;
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++endPos;
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}
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yield return new Substring(str, pos, endPos - pos);
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pos = endPos + 1;
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}
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else
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{
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var endPos = pos;
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while (endPos < length && !char.IsWhiteSpace(str[endPos]))
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++endPos;
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yield return new Substring(str, pos, endPos - pos);
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pos = endPos;
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}
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}
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}
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public static IEnumerable<string> Split(this string str, Func<char, bool> predicate)
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{
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if (string.IsNullOrEmpty(str))
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yield break;
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var length = str.Length;
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var position = 0;
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while (position < length)
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{
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// Skip separator.
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var ch = str[position];
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if (predicate(ch))
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{
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++position;
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continue;
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}
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// Skip to next separator.
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var startPosition = position;
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++position;
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while (position < length)
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{
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ch = str[position];
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if (predicate(ch))
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break;
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++position;
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}
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var endPosition = position;
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yield return str.Substring(startPosition, endPosition - startPosition);
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}
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}
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public static string Join<TValue>(string separator, params TValue[] values)
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{
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return Join(values, separator);
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}
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public static string Join<TValue>(IEnumerable<TValue> values, string separator)
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{
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// Optimize for there not being any values or only a single one
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// that needs no concatenation.
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var firstValue = default(string);
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var valueCount = 0;
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StringBuilder result = null;
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foreach (var value in values)
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{
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if (value == null)
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continue;
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var str = value.ToString();
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if (string.IsNullOrEmpty(str))
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continue;
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++valueCount;
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if (valueCount == 1)
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{
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firstValue = str;
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continue;
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}
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if (valueCount == 2)
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{
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result = new StringBuilder();
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result.Append(firstValue);
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}
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result.Append(separator);
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result.Append(str);
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}
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if (valueCount == 0)
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return null;
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if (valueCount == 1)
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return firstValue;
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return result.ToString();
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}
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public static string MakeUniqueName<TExisting>(string baseName, IEnumerable<TExisting> existingSet,
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Func<TExisting, string> getNameFunc)
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{
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if (getNameFunc == null)
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throw new ArgumentNullException(nameof(getNameFunc));
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if (existingSet == null)
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return baseName;
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var name = baseName;
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var nameLowerCase = name.ToLower();
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var nameIsUnique = false;
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var namesTried = 1;
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// If the name ends in digits, start counting from the given number.
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if (baseName.Length > 0)
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{
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var lastDigit = baseName.Length;
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while (lastDigit > 0 && char.IsDigit(baseName[lastDigit - 1]))
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--lastDigit;
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if (lastDigit != baseName.Length)
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{
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namesTried = int.Parse(baseName.Substring(lastDigit)) + 1;
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baseName = baseName.Substring(0, lastDigit);
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}
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}
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// Find unique name.
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while (!nameIsUnique)
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{
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nameIsUnique = true;
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foreach (var existing in existingSet)
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{
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var existingName = getNameFunc(existing);
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if (existingName.ToLower() == nameLowerCase)
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{
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name = $"{baseName}{namesTried}";
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nameLowerCase = name.ToLower();
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nameIsUnique = false;
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++namesTried;
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break;
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}
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}
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}
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return name;
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}
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////REVIEW: should we allow whitespace and skip automatically?
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public static bool CharacterSeparatedListsHaveAtLeastOneCommonElement(string firstList, string secondList,
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char separator)
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{
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if (firstList == null)
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throw new ArgumentNullException(nameof(firstList));
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if (secondList == null)
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throw new ArgumentNullException(nameof(secondList));
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// Go element by element through firstList and try to find a matching
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// element in secondList.
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var indexInFirst = 0;
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var lengthOfFirst = firstList.Length;
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var lengthOfSecond = secondList.Length;
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while (indexInFirst < lengthOfFirst)
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{
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// Skip empty elements.
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if (firstList[indexInFirst] == separator)
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++indexInFirst;
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// Find end of current element.
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var endIndexInFirst = indexInFirst + 1;
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while (endIndexInFirst < lengthOfFirst && firstList[endIndexInFirst] != separator)
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++endIndexInFirst;
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var lengthOfCurrentInFirst = endIndexInFirst - indexInFirst;
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// Go through element in secondList and match it to the current
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// element.
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var indexInSecond = 0;
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while (indexInSecond < lengthOfSecond)
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{
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// Skip empty elements.
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if (secondList[indexInSecond] == separator)
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++indexInSecond;
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// Find end of current element.
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var endIndexInSecond = indexInSecond + 1;
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while (endIndexInSecond < lengthOfSecond && secondList[endIndexInSecond] != separator)
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++endIndexInSecond;
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var lengthOfCurrentInSecond = endIndexInSecond - indexInSecond;
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// If length matches, do character-by-character comparison.
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if (lengthOfCurrentInFirst == lengthOfCurrentInSecond)
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{
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var startIndexInFirst = indexInFirst;
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var startIndexInSecond = indexInSecond;
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var isMatch = true;
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for (var i = 0; i < lengthOfCurrentInFirst; ++i)
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{
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var first = firstList[startIndexInFirst + i];
|
||
|
|
var second = secondList[startIndexInSecond + i];
|
||
|
|
|
||
|
|
if (char.ToLowerInvariant(first) != char.ToLowerInvariant(second))
|
||
|
|
{
|
||
|
|
isMatch = false;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (isMatch)
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Not a match so go to next.
|
||
|
|
indexInSecond = endIndexInSecond + 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Go to next element.
|
||
|
|
indexInFirst = endIndexInFirst + 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Parse an int at the given position in the string.
|
||
|
|
// Unlike int.Parse(), does not require allocating a new string containing only
|
||
|
|
// the substring with the number.
|
||
|
|
public static int ParseInt(string str, int pos)
|
||
|
|
{
|
||
|
|
var multiply = 1;
|
||
|
|
var result = 0;
|
||
|
|
var length = str.Length;
|
||
|
|
|
||
|
|
while (pos < length)
|
||
|
|
{
|
||
|
|
var ch = str[pos];
|
||
|
|
var digit = ch - '0';
|
||
|
|
if (digit < 0 || digit > 9)
|
||
|
|
break;
|
||
|
|
|
||
|
|
result = result * multiply + digit;
|
||
|
|
|
||
|
|
multiply *= 10;
|
||
|
|
++pos;
|
||
|
|
}
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
////TODO: this should use UTF-8 and not UTF-16
|
||
|
|
|
||
|
|
public static bool WriteStringToBuffer(string text, IntPtr buffer, int bufferSizeInCharacters)
|
||
|
|
{
|
||
|
|
uint offset = 0;
|
||
|
|
return WriteStringToBuffer(text, buffer, bufferSizeInCharacters, ref offset);
|
||
|
|
}
|
||
|
|
|
||
|
|
public static unsafe bool WriteStringToBuffer(string text, IntPtr buffer, int bufferSizeInCharacters, ref uint offset)
|
||
|
|
{
|
||
|
|
if (buffer == IntPtr.Zero)
|
||
|
|
throw new ArgumentNullException("buffer");
|
||
|
|
|
||
|
|
var length = string.IsNullOrEmpty(text) ? 0 : text.Length;
|
||
|
|
if (length > ushort.MaxValue)
|
||
|
|
throw new ArgumentException(string.Format("String exceeds max size of {0} characters", ushort.MaxValue), "text");
|
||
|
|
|
||
|
|
var endOffset = offset + sizeof(char) * length + sizeof(int);
|
||
|
|
if (endOffset > bufferSizeInCharacters)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
var ptr = ((byte*)buffer) + offset;
|
||
|
|
*((ushort*)ptr) = (ushort)length;
|
||
|
|
ptr += sizeof(ushort);
|
||
|
|
|
||
|
|
for (var i = 0; i < length; ++i, ptr += sizeof(char))
|
||
|
|
*((char*)ptr) = text[i];
|
||
|
|
|
||
|
|
offset = (uint)endOffset;
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
public static string ReadStringFromBuffer(IntPtr buffer, int bufferSize)
|
||
|
|
{
|
||
|
|
uint offset = 0;
|
||
|
|
return ReadStringFromBuffer(buffer, bufferSize, ref offset);
|
||
|
|
}
|
||
|
|
|
||
|
|
public static unsafe string ReadStringFromBuffer(IntPtr buffer, int bufferSize, ref uint offset)
|
||
|
|
{
|
||
|
|
if (buffer == IntPtr.Zero)
|
||
|
|
throw new ArgumentNullException(nameof(buffer));
|
||
|
|
|
||
|
|
if (offset + sizeof(int) > bufferSize)
|
||
|
|
return null;
|
||
|
|
|
||
|
|
var ptr = ((byte*)buffer) + offset;
|
||
|
|
var length = *((ushort*)ptr);
|
||
|
|
ptr += sizeof(ushort);
|
||
|
|
|
||
|
|
if (length == 0)
|
||
|
|
return null;
|
||
|
|
|
||
|
|
var endOffset = offset + sizeof(char) * length + sizeof(int);
|
||
|
|
if (endOffset > bufferSize)
|
||
|
|
return null;
|
||
|
|
|
||
|
|
var text = Marshal.PtrToStringUni(new IntPtr(ptr), length);
|
||
|
|
|
||
|
|
offset = (uint)endOffset;
|
||
|
|
return text;
|
||
|
|
}
|
||
|
|
|
||
|
|
public static bool IsPrintable(this char ch)
|
||
|
|
{
|
||
|
|
// This is crude and far from how Unicode defines printable but it should serve as a good enough approximation.
|
||
|
|
return !char.IsControl(ch) && !char.IsWhiteSpace(ch);
|
||
|
|
}
|
||
|
|
|
||
|
|
public static string WithAllWhitespaceStripped(this string str)
|
||
|
|
{
|
||
|
|
var buffer = new StringBuilder();
|
||
|
|
foreach (var ch in str)
|
||
|
|
if (!char.IsWhiteSpace(ch))
|
||
|
|
buffer.Append(ch);
|
||
|
|
return buffer.ToString();
|
||
|
|
}
|
||
|
|
|
||
|
|
public static bool InvariantEqualsIgnoreCase(this string left, string right)
|
||
|
|
{
|
||
|
|
if (string.IsNullOrEmpty(left))
|
||
|
|
return string.IsNullOrEmpty(right);
|
||
|
|
return string.Equals(left, right, StringComparison.InvariantCultureIgnoreCase);
|
||
|
|
}
|
||
|
|
|
||
|
|
public static string ExpandTemplateString(string template, Func<string, string> mapFunc)
|
||
|
|
{
|
||
|
|
if (string.IsNullOrEmpty(template))
|
||
|
|
throw new ArgumentNullException(nameof(template));
|
||
|
|
if (mapFunc == null)
|
||
|
|
throw new ArgumentNullException(nameof(mapFunc));
|
||
|
|
|
||
|
|
var buffer = new StringBuilder();
|
||
|
|
|
||
|
|
var length = template.Length;
|
||
|
|
for (var i = 0; i < length; ++i)
|
||
|
|
{
|
||
|
|
var ch = template[i];
|
||
|
|
if (ch != '{')
|
||
|
|
{
|
||
|
|
buffer.Append(ch);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
++i;
|
||
|
|
var tokenStartPos = i;
|
||
|
|
while (i < length && template[i] != '}')
|
||
|
|
++i;
|
||
|
|
var token = template.Substring(tokenStartPos, i - tokenStartPos);
|
||
|
|
// Loop increment will skip closing '}'.
|
||
|
|
|
||
|
|
var mapped = mapFunc(token);
|
||
|
|
buffer.Append(mapped);
|
||
|
|
}
|
||
|
|
|
||
|
|
return buffer.ToString();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|