Merge pull request #819 from brendanzagaeski/patch-1
[mono.git] / mcs / class / System.Net.Http / System.Net.Http.Headers / NameValueHeaderValue.cs
1 //
2 // NameValueHeaderValue.cs
3 //
4 // Authors:
5 //      Marek Safar  <marek.safar@gmail.com>
6 //
7 // Copyright (C) 2011 Xamarin Inc (http://www.xamarin.com)
8 //
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
16 //
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
19 //
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 //
28
29 using System.Collections.Generic;
30
31 namespace System.Net.Http.Headers
32 {
33         public class NameValueHeaderValue : ICloneable
34         {
35                 internal string value;
36
37                 public NameValueHeaderValue (string name)
38                         : this (name, null)
39                 {
40                 }
41
42                 public NameValueHeaderValue (string name, string value)
43                 {
44                         Parser.Token.Check (name);
45
46                         this.Name = name;
47                         this.Value = value;
48                 }
49
50                 protected internal NameValueHeaderValue (NameValueHeaderValue source)
51                 {
52                         this.Name = source.Name;
53                         this.value = source.value;
54                 }
55
56                 internal NameValueHeaderValue ()
57                 {
58                 }
59
60                 public string Name { get; internal set; }
61
62                 public string Value {
63                         get {
64                                 return value;
65                         }
66                         set {
67                                 if (!string.IsNullOrEmpty (value)) {
68                                         var lexer = new Lexer (value);
69                                         var token = lexer.Scan ();
70                                         if (lexer.Scan () != Token.Type.End || !(token == Token.Type.Token || token == Token.Type.QuotedString))
71                                                 throw new FormatException ();
72
73                                         value = lexer.GetStringValue (token);
74                                 }
75
76                                 this.value = value;
77                         }
78                 }
79
80                 internal static NameValueHeaderValue Create (string name, string value)
81                 {
82                         return new NameValueHeaderValue () {
83                                 Name = name,
84                                 value = value
85                         };
86                 }
87
88                 object ICloneable.Clone ()
89                 {
90                         return new NameValueHeaderValue (this);
91                 }
92
93                 public override int GetHashCode ()
94                 {
95                         int hc = Name.ToLowerInvariant ().GetHashCode ();
96                         if (!string.IsNullOrEmpty (value)) {
97                                 hc ^= value.ToLowerInvariant ().GetHashCode ();
98                         }
99
100                         return hc;
101                 }
102
103                 public override bool Equals (object obj)
104                 {
105                         var source = obj as NameValueHeaderValue;
106                         if (source == null || !string.Equals (source.Name, Name, StringComparison.OrdinalIgnoreCase))
107                                 return false;
108
109                         if (string.IsNullOrEmpty (value))
110                                 return string.IsNullOrEmpty (source.value);
111
112                         return string.Equals (source.value, value, StringComparison.OrdinalIgnoreCase);
113                 }
114
115                 public static NameValueHeaderValue Parse (string input)
116                 {
117                         NameValueHeaderValue value;
118                         if (TryParse (input, out value))
119                                 return value;
120
121                         throw new FormatException (input);
122                 }
123
124                 internal static bool TryParsePragma (string input, int minimalCount, out List<NameValueHeaderValue> result)
125                 {
126                         return CollectionParser.TryParse (input, minimalCount, TryParseElement, out result);
127                 }
128
129                 internal static bool TryParseParameters (Lexer lexer, out List<NameValueHeaderValue> result, out Token t)
130                 {               
131                         var list = new List<NameValueHeaderValue> ();
132                         result = null;
133
134                         while (true) {
135                                 var attr = lexer.Scan ();
136                                 if (attr != Token.Type.Token) {
137                                         t = Token.Empty;
138                                         return false;
139                                 }
140
141                                 string value = null;
142
143                                 t = lexer.Scan ();
144                                 if (t == Token.Type.SeparatorEqual) {
145                                         t = lexer.Scan ();
146                                         if (t != Token.Type.Token && t != Token.Type.QuotedString)
147                                                 return false;
148
149                                         value = lexer.GetStringValue (t);
150
151                                         t = lexer.Scan ();
152                                 }
153
154                                 list.Add (new NameValueHeaderValue () {
155                                         Name = lexer.GetStringValue (attr),
156                                         value = value
157                                 });
158
159                                 if (t == Token.Type.SeparatorSemicolon)
160                                         continue;
161
162                                 result = list;
163                                 return true;
164                         }
165                 }
166
167                 public override string ToString ()
168                 {
169                         if (string.IsNullOrEmpty (value))
170                                 return Name;
171
172                         return Name + "=" + value;
173                 }
174
175                 public static bool TryParse (string input, out NameValueHeaderValue parsedValue)
176                 {
177                         var lexer = new Lexer (input);
178                         Token token;
179                         if (TryParseElement (lexer, out parsedValue, out token) && token == Token.Type.End)
180                                 return true;
181
182                         parsedValue = null;
183                         return false;
184                 }
185
186                 static bool TryParseElement (Lexer lexer, out NameValueHeaderValue parsedValue, out Token t)
187                 {
188                         parsedValue = null;
189
190                         t = lexer.Scan ();
191                         if (t != Token.Type.Token)
192                                 return false;
193
194                         parsedValue = new NameValueHeaderValue () {
195                                 Name = lexer.GetStringValue (t),
196                         };
197
198                         t = lexer.Scan ();
199                         if (t == Token.Type.SeparatorEqual) {
200                                 t = lexer.Scan ();
201
202                                 if (t == Token.Type.Token || t == Token.Type.QuotedString) {
203                                         parsedValue.value = lexer.GetStringValue (t);
204                                         t = lexer.Scan ();
205                                 } else {
206                                         return false;
207                                 }
208                         }
209
210                         return true;
211                 }
212         }
213 }