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// Michael Hutchinson <mhutchinson@novell.com>
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// Copyright (C) 2008 Novell, Inc (http://www.novell.com)
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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using System.Globalization;
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namespace MonoDevelop.Gettext
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public static class StringEscaping
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//based on http://www-ccs.ucsd.edu/c/charset.html
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//with modififications, as Gettext dosn't follow all C escaping
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public static string ToGettextFormat (string text)
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StringBuilder sb = new StringBuilder ();
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for (int i = 0; i < text.Length; i++) {
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//Gettext doesn't like escaping this
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//These shouldn't be in translations... but will be caught by IsControl
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//this doesn't matter since we're not dealing with trigraphs
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if (char.IsControl (c))
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throw new FormatException ("Invalid character in translatable string");
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return sb.ToString ();
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public static string UnEscape (EscapeMode mode, string text)
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case EscapeMode.CSharp:
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return FromCSharpFormat (text);
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case EscapeMode.CSharpVerbatim:
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return FromCSharpVerbatimFormat (text);
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return FromXml (text);
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throw new Exception ("Unknown string escaping mode '" + mode.ToString () + "'");
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//based on http://www-ccs.ucsd.edu/c/charset.html
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public static string FromCFormat (string text)
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//based on the C# 2.0 spec
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static string FromCSharpVerbatimFormat (string text)
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StringBuilder sb = new StringBuilder ();
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for (int i = 0; i < text.Length; i++) {
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throw new FormatException ("Unescaped '\"' character in C# verbatim string.");
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return sb.ToString ();
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static string FromXml (string text)
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StringBuilder sb = new StringBuilder ();
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for (int i = 0; i < text.Length; i++) {
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int end = text.IndexOf (';', i);
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throw new FormatException ("Unterminated XML entity.");
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string entity = text.Substring (i+1, end - i - 1);
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throw new FormatException ("Unrecogised XML entity '&" + entity + ";'.");
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return sb.ToString ();
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//based on the C# 2.0 spec
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static string FromCSharpFormat (string text)
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StringBuilder sb = new StringBuilder ();
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for (int i = 0; i < text.Length; i++) {
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//if (char.IsControl (c);
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throw new FormatException ("Invalid escape '\\" + c2 + "' in translatable string.");
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return sb.ToString ();
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public enum EscapeMode