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@@ -950,4 +950,284 @@ public static class StringExtensions
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}
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#endregion
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#region 转换,来自Abp
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/// <summary>
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/// Converts PascalCase string to camelCase string.
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/// </summary>
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/// <param name="str">String to convert</param>
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/// <param name="useCurrentCulture">set true to use current culture. Otherwise, invariant culture will be used.</param>
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/// <param name="handleAbbreviations">set true to if you want to convert 'XYZ' to 'xyz'.</param>
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/// <returns>camelCase of the string</returns>
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public static string ToCamelCase(this string str, bool useCurrentCulture = false, bool handleAbbreviations = false)
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{
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if (string.IsNullOrWhiteSpace(str))
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{
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return str;
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}
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if (str.Length == 1)
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{
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return useCurrentCulture ? str.ToLower() : str.ToLowerInvariant();
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}
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if (handleAbbreviations && IsAllUpperCase(str))
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{
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return useCurrentCulture ? str.ToLower() : str.ToLowerInvariant();
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}
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return (useCurrentCulture ? char.ToLower(str[0]) : char.ToLowerInvariant(str[0])) + str.Substring(1);
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}
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/// <summary>
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/// Converts given PascalCase/camelCase string to sentence (by splitting words by space).
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/// Example: "ThisIsSampleSentence" is converted to "This is a sample sentence".
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/// </summary>
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/// <param name="str">String to convert.</param>
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/// <param name="useCurrentCulture">set true to use current culture. Otherwise, invariant culture will be used.</param>
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public static string ToSentenceCase(this string str, bool useCurrentCulture = false)
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{
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if (string.IsNullOrWhiteSpace(str))
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{
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return str;
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}
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return useCurrentCulture
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? Regex.Replace(str, "[a-z][A-Z]", m => m.Value[0] + " " + char.ToLower(m.Value[1]))
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: Regex.Replace(str, "[a-z][A-Z]", m => m.Value[0] + " " + char.ToLowerInvariant(m.Value[1]));
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}
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/// <summary>
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/// Converts given PascalCase/camelCase string to kebab-case.
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/// </summary>
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/// <param name="str">String to convert.</param>
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/// <param name="useCurrentCulture">set true to use current culture. Otherwise, invariant culture will be used.</param>
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public static string ToKebabCase(this string str, bool useCurrentCulture = false)
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{
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if (string.IsNullOrWhiteSpace(str))
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{
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return str;
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}
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str = str.ToCamelCase();
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return useCurrentCulture
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? Regex.Replace(str, "[a-z][A-Z]", m => m.Value[0] + "-" + char.ToLower(m.Value[1]))
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: Regex.Replace(str, "[a-z][A-Z]", m => m.Value[0] + "-" + char.ToLowerInvariant(m.Value[1]));
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}
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/// <summary>
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/// Converts given PascalCase/camelCase string to snake case.
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/// Example: "ThisIsSampleSentence" is converted to "this_is_a_sample_sentence".
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/// https://github.com/npgsql/npgsql/blob/dev/src/Npgsql/NameTranslation/NpgsqlSnakeCaseNameTranslator.cs#L51
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/// </summary>
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/// <param name="str">String to convert.</param>
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/// <returns></returns>
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public static string ToSnakeCase(this string str)
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{
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if (string.IsNullOrWhiteSpace(str))
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{
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return str;
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}
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var builder = new StringBuilder(str.Length + Math.Min(2, str.Length / 5));
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var previousCategory = default(UnicodeCategory?);
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for (var currentIndex = 0; currentIndex < str.Length; currentIndex++)
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{
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var currentChar = str[currentIndex];
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if (currentChar == '_')
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{
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builder.Append('_');
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previousCategory = null;
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continue;
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}
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var currentCategory = char.GetUnicodeCategory(currentChar);
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switch (currentCategory)
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{
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case UnicodeCategory.UppercaseLetter:
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case UnicodeCategory.TitlecaseLetter:
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if (previousCategory == UnicodeCategory.SpaceSeparator ||
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previousCategory == UnicodeCategory.LowercaseLetter ||
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previousCategory != UnicodeCategory.DecimalDigitNumber &&
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previousCategory != null &&
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currentIndex > 0 &&
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currentIndex + 1 < str.Length &&
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char.IsLower(str[currentIndex + 1]))
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{
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builder.Append('_');
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}
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currentChar = char.ToLower(currentChar);
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break;
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case UnicodeCategory.LowercaseLetter:
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case UnicodeCategory.DecimalDigitNumber:
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if (previousCategory == UnicodeCategory.SpaceSeparator)
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{
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builder.Append('_');
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}
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break;
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default:
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if (previousCategory != null)
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{
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previousCategory = UnicodeCategory.SpaceSeparator;
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}
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continue;
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}
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builder.Append(currentChar);
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previousCategory = currentCategory;
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}
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return builder.ToString();
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}
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/// <summary>
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/// Converts camelCase string to PascalCase string.
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/// </summary>
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/// <param name="str">String to convert</param>
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/// <param name="useCurrentCulture">set true to use current culture. Otherwise, invariant culture will be used.</param>
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/// <returns>PascalCase of the string</returns>
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public static string ToPascalCase(this string str, bool useCurrentCulture = false)
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{
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if (string.IsNullOrWhiteSpace(str))
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{
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return str;
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}
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if (str.Length == 1)
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{
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return useCurrentCulture ? str.ToUpper() : str.ToUpperInvariant();
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}
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return (useCurrentCulture ? char.ToUpper(str[0]) : char.ToUpperInvariant(str[0])) + str.Substring(1);
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}
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/// <summary>
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/// Removes first occurrence of the given prefixes from beginning of the given string.
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/// </summary>
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/// <param name="str">The string.</param>
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/// <param name="preFixes">one or more prefix.</param>
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/// <returns>Modified string or the same string if it has not any of given prefixes</returns>
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public static string RemovePreFix(this string str, params string[] preFixes)
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{
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return str.RemovePreFix(StringComparison.Ordinal, preFixes);
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}
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/// <summary>
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/// Removes first occurrence of the given prefixes from beginning of the given string.
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/// </summary>
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/// <param name="str">The string.</param>
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/// <param name="comparisonType">String comparison type</param>
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/// <param name="preFixes">one or more prefix.</param>
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/// <returns>Modified string or the same string if it has not any of given prefixes</returns>
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public static string RemovePreFix(this string str, StringComparison comparisonType, params string[] preFixes)
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{
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if (str.IsNullOrEmpty())
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{
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return str;
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}
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if (preFixes.IsNullOrEmpty())
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{
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return str;
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}
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foreach (var preFix in preFixes)
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{
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if (str.StartsWith(preFix, comparisonType))
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{
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return str.Right(str.Length - preFix.Length);
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}
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}
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return str;
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}
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/// <summary>
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/// Removes first occurrence of the given postfixes from end of the given string.
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/// </summary>
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/// <param name="str">The string.</param>
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/// <param name="postFixes">one or more postfix.</param>
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/// <returns>Modified string or the same string if it has not any of given postfixes</returns>
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public static string RemovePostFix(this string str, params string[] postFixes)
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{
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return str.RemovePostFix(StringComparison.Ordinal, postFixes);
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}
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/// <summary>
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/// Removes first occurrence of the given postfixes from end of the given string.
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/// </summary>
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/// <param name="str">The string.</param>
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/// <param name="comparisonType">String comparison type</param>
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/// <param name="postFixes">one or more postfix.</param>
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/// <returns>Modified string or the same string if it has not any of given postfixes</returns>
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public static string RemovePostFix(this string str, StringComparison comparisonType, params string[] postFixes)
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{
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if (str.IsNullOrEmpty())
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{
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return str;
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}
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if (postFixes.IsNullOrEmpty())
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{
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return str;
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}
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foreach (var postFix in postFixes)
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{
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if (str.EndsWith(postFix, comparisonType))
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{
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return str.Left(str.Length - postFix.Length);
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}
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}
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return str;
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}
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/// <summary>
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/// Gets a substring of a string from beginning of the string.
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/// </summary>
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/// <exception cref="ArgumentNullException">Thrown if <paramref name="str"/> is null</exception>
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/// <exception cref="ArgumentException">Thrown if <paramref name="len"/> is bigger that string's length</exception>
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public static string Left(this string str, int len)
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{
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if (str.Length < len)
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{
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throw new ArgumentException("len argument can not be bigger than given string's length!");
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}
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return str.Substring(0, len);
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}
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/// <summary>
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/// Gets a substring of a string from end of the string.
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/// </summary>
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/// <exception cref="ArgumentNullException">Thrown if <paramref name="str"/> is null</exception>
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/// <exception cref="ArgumentException">Thrown if <paramref name="len"/> is bigger that string's length</exception>
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public static string Right(this string str, int len)
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{
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if (str.Length < len)
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{
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throw new ArgumentException("len argument can not be bigger than given string's length!");
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}
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return str.Substring(str.Length - len, len);
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}
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private static bool IsAllUpperCase(string input)
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{
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for (int i = 0; i < input.Length; i++)
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{
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if (Char.IsLetter(input[i]) && !Char.IsUpper(input[i]))
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{
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return false;
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}
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}
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return true;
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}
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#endregion
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}
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