Imported Upstream version 3.2.8+dfsgupstream/3.2.8+dfsg

1 files changed, 117 insertions, 0 deletions

diff --git a/mcs/class/System.Net.Http/System.Net.Http.Headers/CollectionParser.cs b/mcs/class/System.Net.Http/System.Net.Http.Headers/CollectionParser.cs
new file mode 100644
index 0000000000..cbaafe0f80
--- /dev/null
+++ b/mcs/class/System.Net.Http/System.Net.Http.Headers/CollectionParser.cs
@@ -0,0 +1,117 @@
+//
+// CollectionParser.cs
+//
+// Authors:
+//	Marek Safar  <marek.safar@gmail.com>
+//
+// Copyright (C) 2014 Xamarin Inc (http://www.xamarin.com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+using System.Collections.Generic;
+
+namespace System.Net.Http.Headers
+{
+	delegate bool ElementTryParser<T> (Lexer lexer, out T parsedValue, out Token token);
+
+	static class CollectionParser
+	{
+		public static bool TryParse<T> (string input, int minimalCount, ElementTryParser<T> parser, out List<T> result) where T : class
+		{
+			var lexer = new Lexer (input);
+			result = new List<T> ();
+
+			while (true) {
+				Token token;
+				T parsedValue;
+				if (!parser (lexer, out parsedValue, out token))
+					return false;
+
+				if (parsedValue != null)
+					result.Add (parsedValue);
+
+				if (token == Token.Type.SeparatorComma)
+					continue;
+
+				if (token == Token.Type.End) {
+					if (minimalCount > result.Count) {
+						result = null;
+						return false;
+					}
+						
+					return true;
+				}
+
+				result = null;
+				return false;
+			}
+		}
+
+		public static bool TryParse (string input, int minimalCount, out List<string> result)
+		{
+			return TryParse (input, minimalCount, TryParseStringElement, out result);
+		}
+
+		public static bool TryParseRepetition (string input, int minimalCount, out List<string> result)
+		{
+			return TryParseRepetition (input, minimalCount, TryParseStringElement, out result);
+		}
+
+		static bool TryParseStringElement (Lexer lexer, out string parsedValue, out Token t)
+		{
+			t = lexer.Scan ();
+			if (t == Token.Type.Token) {
+				parsedValue = lexer.GetStringValue (t);
+				if (parsedValue.Length == 0)
+					parsedValue = null;
+
+				t = lexer.Scan ();
+			} else {
+				parsedValue = null;
+			}
+
+			return true;
+		}
+
+		public static bool TryParseRepetition<T> (string input, int minimalCount, ElementTryParser<T> parser, out List<T> result) where T : class
+		{
+			var lexer = new Lexer (input);
+			result = new List<T> ();
+
+			while (true) {
+				Token token;
+				T parsedValue;
+				if (!parser (lexer, out parsedValue, out token))
+					return false;
+
+				if (parsedValue != null)
+					result.Add (parsedValue);
+
+				if (token == Token.Type.End) {
+					if (minimalCount > result.Count)
+						return false;
+						
+					return true;
+				}
+			}
+		}
+	}
+}
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