117 lines
3.2 KiB
C#
117 lines
3.2 KiB
C#
//
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// CollectionParser.cs
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//
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// Authors:
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// Marek Safar <marek.safar@gmail.com>
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//
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// Copyright (C) 2014 Xamarin Inc (http://www.xamarin.com)
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//
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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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//
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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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//
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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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//
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using System.Collections.Generic;
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namespace System.Net.Http.Headers
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{
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delegate bool ElementTryParser<T> (Lexer lexer, out T parsedValue, out Token token);
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static class CollectionParser
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{
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public static bool TryParse<T> (string input, int minimalCount, ElementTryParser<T> parser, out List<T> result) where T : class
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{
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var lexer = new Lexer (input);
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result = new List<T> ();
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while (true) {
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Token token;
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T parsedValue;
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if (!parser (lexer, out parsedValue, out token))
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return false;
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if (parsedValue != null)
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result.Add (parsedValue);
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if (token == Token.Type.SeparatorComma)
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continue;
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if (token == Token.Type.End) {
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if (minimalCount > result.Count) {
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result = null;
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return false;
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}
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return true;
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}
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result = null;
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return false;
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}
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}
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public static bool TryParse (string input, int minimalCount, out List<string> result)
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{
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return TryParse (input, minimalCount, TryParseStringElement, out result);
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}
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public static bool TryParseRepetition (string input, int minimalCount, out List<string> result)
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{
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return TryParseRepetition (input, minimalCount, TryParseStringElement, out result);
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}
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static bool TryParseStringElement (Lexer lexer, out string parsedValue, out Token t)
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{
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t = lexer.Scan ();
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if (t == Token.Type.Token) {
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parsedValue = lexer.GetStringValue (t);
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if (parsedValue.Length == 0)
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parsedValue = null;
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t = lexer.Scan ();
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} else {
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parsedValue = null;
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}
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return true;
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}
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public static bool TryParseRepetition<T> (string input, int minimalCount, ElementTryParser<T> parser, out List<T> result) where T : class
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{
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var lexer = new Lexer (input);
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result = new List<T> ();
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while (true) {
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Token token;
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T parsedValue;
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if (!parser (lexer, out parsedValue, out token))
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return false;
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if (parsedValue != null)
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result.Add (parsedValue);
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if (token == Token.Type.End) {
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if (minimalCount > result.Count)
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return false;
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return true;
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}
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}
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}
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}
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} |