/// <summary>
/// Reads a token or token=(token|quoted-string) from the <paramref name="lexer"/>, convert it to a key value pair and advances the <paramref name="lexer"/>.
/// </summary>
/// <param name="lexer">The lexer to read from.</param>
/// <returns>The converted key value pair.</returns>
private static KeyValuePair <string, string> ReadKeyValuePair(ref HttpHeaderValueLexer lexer)
{
Debug.Assert(lexer.Type == HttpHeaderValueItemType.Token, "lexer.Type == HttpHeaderValueItemType.Token");
string name = lexer.OriginalText;
string value = null;
lexer = lexer.ReadNext();
if (lexer.Type == HttpHeaderValueItemType.ValueSeparator)
{
lexer = lexer.ReadNext();
Debug.Assert(
lexer.Type == HttpHeaderValueItemType.Token || lexer.Type == HttpHeaderValueItemType.QuotedString,
"lexer.Type == HttpHeaderValueItemType.Token || lexer.Type == HttpHeaderValueItemType.QuotedString");
value = lexer.OriginalText;
lexer = lexer.ReadNext();
}
Debug.Assert(
lexer.Type == HttpHeaderValueItemType.End || lexer.Type == HttpHeaderValueItemType.ElementSeparator || lexer.Type == HttpHeaderValueItemType.ParameterSeparator,
"lexer.Type == HttpHeaderValueItemType.End || lexer.Type == HttpHeaderValueItemType.ElementSeparator || lexer.Type == HttpHeaderValueItemType.ParameterSeparator");
return(new KeyValuePair <string, string>(name, value));
}
/// <summary>
/// Reads the content of a HTTP header from this <see cref="HttpHeaderValueLexer"/> instance to a new <see cref="HttpHeaderValue"/> instance.
/// </summary>
/// <returns>A new <see cref="HttpHeaderValue"/> instance populated with the content from this <see cref="HttpHeaderValueLexer"/> instance.</returns>
internal HttpHeaderValue ToHttpHeaderValue()
{
HttpHeaderValueLexer lexer = this;
Debug.Assert(
lexer.Type == HttpHeaderValueItemType.Start,
"lexer.Type == HttpHeaderValueItemType.Start -- Should only call this method on a lexer that's not yet been read.");
HttpHeaderValue headerValue = new HttpHeaderValue();
// header = "header-name" ":" 1#element
// element = token [ BWS "=" BWS (token | quoted-string) ]
// *( OWS ";" [ OWS parameter ] )
// parameter = token [ BWS "=" BWS (token | quoted-string) ]
while (true)
{
if (lexer.Type == HttpHeaderValueItemType.End)
{
break;
}
Debug.Assert(
lexer.Type == HttpHeaderValueItemType.Start || lexer.Type == HttpHeaderValueItemType.ElementSeparator,
"lexer.Type == HttpHeaderValueItemType.Start || lexer.Type == HttpHeaderValueItemType.ElementSeparator");
lexer = lexer.ReadNext();
Debug.Assert(
lexer.Type == HttpHeaderValueItemType.Token || lexer.Type == HttpHeaderValueItemType.End,
"lexer.Type == HttpHeaderValueItemType.Token || lexer.Type == HttpHeaderValueItemType.End");
if (lexer.Type == HttpHeaderValueItemType.Token)
{
var element = ReadHttpHeaderValueElement(ref lexer);
// If multiple elements with the same name encountered, the first one wins.
if (!headerValue.ContainsKey(element.Name))
{
headerValue.Add(element.Name, element);
}
}
}
return(headerValue);
}
/// <summary>
/// Reads a <see cref="HttpHeaderValueElement"/> from <paramref name="lexer"/> and advances the <paramref name="lexer"/> forward.
/// </summary>
/// <param name="lexer">The lexer to read from.</param>
/// <returns>The <see cref="HttpHeaderValueElement"/> that was read.</returns>
private static HttpHeaderValueElement ReadHttpHeaderValueElement(ref HttpHeaderValueLexer lexer)
{
Debug.Assert(lexer.Type == HttpHeaderValueItemType.Token, "lexer.Type == HttpHeaderValueItemType.Token");
List <KeyValuePair <string, string> > keyValuePairs = new List <KeyValuePair <string, string> > {
ReadKeyValuePair(ref lexer)
};
while (lexer.Type == HttpHeaderValueItemType.ParameterSeparator)
{
lexer = lexer.ReadNext();
keyValuePairs.Add(ReadKeyValuePair(ref lexer));
}
Debug.Assert(
lexer.Type == HttpHeaderValueItemType.ElementSeparator || lexer.Type == HttpHeaderValueItemType.End,
"lexer.Type == HttpHeaderValueItemType.ElementSeparator || lexer.Type == HttpHeaderValueItemType.End");
return(new HttpHeaderValueElement(keyValuePairs[0].Key, keyValuePairs[0].Value, keyValuePairs.Skip(1).ToArray()));
}
/// <summary>
/// Reads a token or token=(token|quoted-string) from the <paramref name="lexer"/>, convert it to a key value pair and advances the <paramref name="lexer"/>.
/// </summary>
/// <param name="lexer">The lexer to read from.</param>
/// <returns>The converted key value pair.</returns>
private static KeyValuePair<string, string> ReadKeyValuePair(ref HttpHeaderValueLexer lexer)
{
Debug.Assert(lexer.Type == HttpHeaderValueItemType.Token, "lexer.Type == HttpHeaderValueItemType.Token");
string name = lexer.OriginalText;
string value = null;
lexer = lexer.ReadNext();
if (lexer.Type == HttpHeaderValueItemType.ValueSeparator)
{
lexer = lexer.ReadNext();
Debug.Assert(
lexer.Type == HttpHeaderValueItemType.Token || lexer.Type == HttpHeaderValueItemType.QuotedString,
"lexer.Type == HttpHeaderValueItemType.Token || lexer.Type == HttpHeaderValueItemType.QuotedString");
value = lexer.OriginalText;
lexer = lexer.ReadNext();
}
Debug.Assert(
lexer.Type == HttpHeaderValueItemType.End || lexer.Type == HttpHeaderValueItemType.ElementSeparator || lexer.Type == HttpHeaderValueItemType.ParameterSeparator,
"lexer.Type == HttpHeaderValueItemType.End || lexer.Type == HttpHeaderValueItemType.ElementSeparator || lexer.Type == HttpHeaderValueItemType.ParameterSeparator");
return new KeyValuePair<string, string>(name, value);
}
/// <summary>
/// Reads a <see cref="HttpHeaderValueElement"/> from <paramref name="lexer"/> and advances the <paramref name="lexer"/> forward.
/// </summary>
/// <param name="lexer">The lexer to read from.</param>
/// <returns>The <see cref="HttpHeaderValueElement"/> that was read.</returns>
private static HttpHeaderValueElement ReadHttpHeaderValueElement(ref HttpHeaderValueLexer lexer)
{
Debug.Assert(lexer.Type == HttpHeaderValueItemType.Token, "lexer.Type == HttpHeaderValueItemType.Token");
List<KeyValuePair<string, string>> keyValuePairs = new List<KeyValuePair<string, string>> { ReadKeyValuePair(ref lexer) };
while (lexer.Type == HttpHeaderValueItemType.ParameterSeparator)
{
lexer = lexer.ReadNext();
keyValuePairs.Add(ReadKeyValuePair(ref lexer));
}
Debug.Assert(
lexer.Type == HttpHeaderValueItemType.ElementSeparator || lexer.Type == HttpHeaderValueItemType.End,
"lexer.Type == HttpHeaderValueItemType.ElementSeparator || lexer.Type == HttpHeaderValueItemType.End");
return new HttpHeaderValueElement(keyValuePairs[0].Key, keyValuePairs[0].Value, keyValuePairs.Skip(1).ToArray());
}
