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//
// NameValueHeaderValue.cs
//
// Authors:
// Marek Safar <marek.safar@gmail.com>
//
// Copyright (C) 2011 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
{
public class NameValueHeaderValue : ICloneable
{
string value;
public NameValueHeaderValue (string name)
: this (name, null)
{
}
public NameValueHeaderValue (string name, string value)
{
Parser.Token.Check (name);
this.Name = name;
this.Value = value;
}
protected internal NameValueHeaderValue (NameValueHeaderValue source)
{
this.Name = source.Name;
this.value = source.value;
}
private NameValueHeaderValue ()
{
}
public string Name { get; private set; }
public string Value {
get {
return value;
}
set {
if (!string.IsNullOrEmpty (value)) {
var lexer = new Lexer (value);
var token = lexer.Scan ();
if (lexer.Scan () != Token.Type.End || !(token == Token.Type.Token || token == Token.Type.QuotedString))
throw new FormatException ();
value = lexer.GetStringValue (token);
}
this.value = value;
}
}
internal static NameValueHeaderValue Create (string name, string value)
{
return new NameValueHeaderValue () {
Name = name,
value = value
};
}
object ICloneable.Clone ()
{
return new NameValueHeaderValue (this);
}
public override int GetHashCode ()
{
int hc = Name.ToLowerInvariant ().GetHashCode ();
if (!string.IsNullOrEmpty (value)) {
hc ^= value.ToLowerInvariant ().GetHashCode ();
}
return hc;
}
public override bool Equals (object obj)
{
var source = obj as NameValueHeaderValue;
if (source == null || !string.Equals (source.Name, Name, StringComparison.OrdinalIgnoreCase))
return false;
if (string.IsNullOrEmpty (value))
return string.IsNullOrEmpty (source.value);
return string.Equals (source.value, value, StringComparison.OrdinalIgnoreCase);
}
public static NameValueHeaderValue Parse (string input)
{
NameValueHeaderValue value;
if (TryParse (input, out value))
return value;
throw new FormatException (input);
}
internal static bool TryParseParameters (Lexer lexer, out List<NameValueHeaderValue> result)
{
return TryParseCollection (lexer, out result, Token.Type.SeparatorSemicolon);
}
internal static bool TryParsePragma (string input, out List<NameValueHeaderValue> result)
{
return TryParseCollection (new Lexer (input), out result, Token.Type.SeparatorComma);
}
static bool TryParseCollection (Lexer lexer, out List<NameValueHeaderValue> result, Token.Type separator)
{
var list = new List<NameValueHeaderValue> ();
result = null;
Token t;
do {
var attr = lexer.Scan ();
if (attr != Token.Type.Token)
return false;
string value = null;
t = lexer.Scan ();
if (t == Token.Type.SeparatorEqual) {
t = lexer.Scan ();
if (t != Token.Type.Token && t != Token.Type.QuotedString)
return false;
value = lexer.GetStringValue (t);
t = lexer.Scan ();
}
if (t == separator|| t == Token.Type.End) {
list.Add (new NameValueHeaderValue () {
Name = lexer.GetStringValue (attr),
value = value
});
} else {
return false;
}
} while (t == separator);
result = list;
return true;
}
public override string ToString ()
{
if (string.IsNullOrEmpty (value))
return Name;
return Name + "=" + value;
}
public static bool TryParse (string input, out NameValueHeaderValue parsedValue)
{
parsedValue = null;
var lexer = new Lexer (input);
var t = lexer.Scan ();
if (t != Token.Type.Token && t != Token.Type.QuotedString)
return false;
string v = null;
var token2 = lexer.Scan ();
if (token2 != Token.Type.End) {
if (token2 != Token.Type.SeparatorEqual)
return false;
token2 = lexer.Scan ();
if (token2 == Token.Type.Token || token2 == Token.Type.QuotedString) {
v = lexer.GetStringValue (token2);
token2 = lexer.Scan ();
}
if (token2 != Token.Type.End)
return false;
}
parsedValue = new NameValueHeaderValue () {
Name = lexer.GetStringValue (t),
value = v
};
return true;
}
}
}
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