public static bool TryParse(string input, out ViaHeaderValue parsedValue)
{
var lexer = new Lexer(input);
Token token;
if (TryParseElement(lexer, out parsedValue, out token) && token == Token.Type.End)
{
return(true);
}
parsedValue = null;
return(false);
}
static bool TryParseElement(Lexer lexer, out ViaHeaderValue parsedValue, out Token t)
{
parsedValue = null;
t = lexer.Scan();
if (t != Token.Type.Token)
{
return(false);
}
var next = lexer.Scan();
ViaHeaderValue value = new ViaHeaderValue();
if (next == Token.Type.SeparatorSlash)
{
next = lexer.Scan();
if (next != Token.Type.Token)
{
return(false);
}
value.ProtocolName = lexer.GetStringValue(t);
value.ProtocolVersion = lexer.GetStringValue(next);
next = lexer.Scan();
}
else
{
value.ProtocolVersion = lexer.GetStringValue(t);
}
if (next != Token.Type.Token)
{
return(false);
}
if (lexer.PeekChar() == ':')
{
lexer.EatChar();
t = lexer.Scan();
if (t != Token.Type.Token)
{
return(false);
}
}
else
{
t = next;
}
value.ReceivedBy = lexer.GetStringValue(next, t);
string comment;
if (lexer.ScanCommentOptional(out comment, out t))
{
t = lexer.Scan();
}
value.Comment = comment;
parsedValue = value;
return(true);
}