private RangeHeaderValue(RangeHeaderValue source)
: this()
{
if (source.ranges != null)
{
foreach (var item in source.ranges)
{
Ranges.Add(item);
}
}
}
public static bool TryParse(string input, out RangeHeaderValue parsedValue)
{
parsedValue = null;
var lexer = new Lexer(input);
var t = lexer.Scan();
if (t != Token.Type.Token)
{
return(false);
}
var value = new RangeHeaderValue();
value.unit = lexer.GetStringValue(t);
t = lexer.Scan();
if (t != Token.Type.SeparatorEqual)
{
return(false);
}
bool token_read;
do
{
long?from = null, to = null;
long number;
token_read = false;
t = lexer.Scan(recognizeDash: true);
switch (t.Kind)
{
case Token.Type.SeparatorDash:
t = lexer.Scan();
if (!lexer.TryGetNumericValue(t, out number))
{
return(false);
}
to = number;
break;
case Token.Type.Token:
string s = lexer.GetStringValue(t);
var values = s.Split(new [] { '-' }, StringSplitOptions.RemoveEmptyEntries);
if (!Parser.Long.TryParse(values[0], out number))
{
return(false);
}
switch (values.Length)
{
case 1:
t = lexer.Scan(recognizeDash: true);
from = number;
switch (t.Kind)
{
case Token.Type.SeparatorDash:
t = lexer.Scan();
if (t != Token.Type.Token)
{
token_read = true;
break;
}
if (!lexer.TryGetNumericValue(t, out number))
{
return(false);
}
to = number;
if (to < from)
{
return(false);
}
break;
case Token.Type.End:
if (s.Length > 0 && s [s.Length - 1] != '-')
{
return(false);
}
token_read = true;
break;
case Token.Type.SeparatorComma:
token_read = true;
break;
default:
return(false);
}
break;
case 2:
from = number;
if (!Parser.Long.TryParse(values[1], out number))
{
return(false);
}
to = number;
if (to < from)
{
return(false);
}
break;
default:
return(false);
}
break;
default:
return(false);
}
value.Ranges.Add(new RangeItemHeaderValue(from, to));
if (!token_read)
{
t = lexer.Scan();
}
} while (t == Token.Type.SeparatorComma);
if (t != Token.Type.End)
{
return(false);
}
parsedValue = value;
return(true);
}