1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
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;
}
}
}
}
}
|
