StringBuilder - ExtractStringArobasDoubleQuote
A StringBuilder extension method that extracts the string arobas double quote described by @this.
public static void Main() { int endIndex; // C# Extension Method: StringBuilder - ExtractStringArobasDoubleQuote Console.WriteLine(new StringBuilder(" ").ExtractStringArobasDoubleQuote()); Console.WriteLine(new StringBuilder("@\"z\"").ExtractStringArobasDoubleQuote().ToString()); Console.WriteLine(new StringBuilder("@@\"z\"z").ExtractStringArobasDoubleQuote(1, out endIndex).ToString()); Console.WriteLine(endIndex); }
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using System; using System.Text; public static partial class Extensions { /// <summary> /// A StringBuilder extension method that extracts the string arobas double quote /// described by @this. /// </summary> /// <param name="this">The @this to act on.</param> /// <returns>The extracted string arobas double quote.</returns> public static StringBuilder ExtractStringArobasDoubleQuote(this StringBuilder @this) { return @this.ExtractStringArobasDoubleQuote(0); } /// <summary> /// A StringBuilder extension method that extracts the string arobas double quote /// described by @this. /// </summary> /// <param name="this">The @this to act on.</param> /// <param name="endIndex">[out] The end index.</param> /// <returns>The extracted string arobas double quote.</returns> public static StringBuilder ExtractStringArobasDoubleQuote(this StringBuilder @this, out int endIndex) { return @this.ExtractStringArobasDoubleQuote(0, out endIndex); } /// <summary> /// A StringBuilder extension method that extracts the string arobas double quote /// described by @this. /// </summary> /// <exception cref="Exception">Thrown when an exception error condition occurs.</exception> /// <param name="this">The @this to act on.</param> /// <param name="startIndex">The start index.</param> /// <returns>The extracted string arobas double quote.</returns> public static StringBuilder ExtractStringArobasDoubleQuote(this StringBuilder @this, int startIndex) { int endIndex; return @this.ExtractStringArobasDoubleQuote(startIndex, out endIndex); } /// <summary> /// A StringBuilder extension method that extracts the string arobas double quote /// described by @this. /// </summary> /// <exception cref="Exception">Thrown when an exception error condition occurs.</exception> /// <param name="this">The @this to act on.</param> /// <param name="startIndex">The start index.</param> /// <param name="endIndex">[out] The end index.</param> /// <returns>The extracted string arobas double quote.</returns> public static StringBuilder ExtractStringArobasDoubleQuote(this StringBuilder @this, int startIndex, out int endIndex) { var sb = new StringBuilder(); if (@this.Length > startIndex + 1) { var ch1 = @this[startIndex]; var ch2 = @this[startIndex + 1]; if (ch1 == '@' && ch2 == '"') { // @"my string" var pos = startIndex + 2; while (pos < @this.Length) { var ch = @this[pos]; pos++; if (ch == '"' && pos < @this.Length && @this[pos] == '"') { sb.Append(ch); pos++; // Treat as escape character for @"abc""def" } else if (ch == '"') { endIndex = pos; return sb; } else { sb.Append(ch); } } throw new Exception("Unclosed string starting at position: " + startIndex); } } endIndex = -1; return null; } }