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Split tag string

/ Published in: C#
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This code should split a tag string provided in a format similar to YouTube or Flickr.

Input string:
tag1 tag2 "tag3 tag4"

Output as a list:
tag1
tag2
tag3 tag4

I'm not entirely positive this works. I just wrote it for a coworker but hopefully it will provide someone with a starting point if it doesn't work.

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  1. public List<string> splitTags(string tags)
  2. {
  3.     StringBuilder b = new StringBuilder();
  4.     List<string> tagList = new List<string>();
  5.     bool inQuoteState = false;
  6.  
  7.     foreach (char character in tags.ToCharArray())
  8.     {
  9.         switch (character)
  10.         {
  11.             case '"':
  12.                 if (inQuoteState){
  13.                     tagList.Add(b.ToString());
  14.                     b = new StringBuilder();
  15.                 }
  16.  
  17.                 inQuoteState = !inQuoteState;
  18.                 break;
  19.             case ' ':
  20.                 if (!inQuoteState)
  21.                 {
  22.                     if (b.Length > 0) //don't add empty tags
  23.                         tagList.Add(b.ToString());
  24.  
  25.                     b = new StringBuilder();
  26.                 }
  27.                 else
  28.                     b.Append(character);
  29.                 break;
  30.             default:
  31.                 b.Append(character);
  32.                 break;
  33.         }
  34.     }
  35.  
  36.     return tagList;
  37. }

URL: http://www.planetjonny.com

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