private static Status ParseStatus(IEnumerator <Symbol> enumerator, ref Symbol temp)
{
Status status = Status.Obsolete;
temp.Expect(Symbol.Status);
temp = enumerator.NextNonEOLSymbol();
try
{
status = StatusHelper.CreateStatus(temp.ToString());
temp = enumerator.NextNonEOLSymbol();
}
catch (ArgumentException)
{
temp.Throw("Invalid status");
}
return(status);
}
public TextualConvention(string module, string name, Lexer lexer)
{
_name = name;
Symbol temp = lexer.GetNextNonEOLSymbol();
if (temp == Symbol.DisplayHint)
{
// TODO: this needs decoding to a useful format.
_displayHint = new DisplayHint(lexer.GetNextNonEOLSymbol().ToString().Trim(new[] { '"' }));
temp = lexer.GetNextNonEOLSymbol();
}
temp.Expect(Symbol.Status);
try
{
_status = StatusHelper.CreateStatus(lexer.GetNextNonEOLSymbol().ToString());
temp = lexer.GetNextNonEOLSymbol();
}
catch (ArgumentException)
{
temp.Throw("Invalid status");
}
temp.Expect(Symbol.Description);
_description = lexer.GetNextNonEOLSymbol().ToString().Trim(new[] { '"' });
temp = lexer.GetNextNonEOLSymbol();
if (temp == Symbol.Reference)
{
_reference = lexer.GetNextNonEOLSymbol().ToString();
temp = lexer.GetNextNonEOLSymbol();
}
temp.Expect(Symbol.Syntax);
/*
* RFC2579 definition:
* Syntax ::= -- Must be one of the following:
* -- a base type (or its refinement), or
* -- a BITS pseudo-type
* type
* | "BITS" "{" NamedBits "}"
*
* From section 3.5:
* The data structure must be one of the alternatives defined
* in the ObjectSyntax CHOICE or the BITS construct. Note
* that this means that the SYNTAX clause of a Textual
* Convention can not refer to a previously defined Textual
* Convention.
*
* The SYNTAX clause of a TEXTUAL CONVENTION macro may be
* sub-typed in the same way as the SYNTAX clause of an
* OBJECT-TYPE macro.
*
* Therefore the possible values are (grouped by underlying type):
* INTEGER, Integer32
* OCTET STRING, Opaque
* OBJECT IDENTIFIER
* IpAddress
* Counter64
* Unsigned32, Counter32, Gauge32, TimeTicks
* BITS
* With appropriate sub-typing.
*/
temp = lexer.GetNextNonEOLSymbol();
if (temp == Symbol.Bits)
{
_syntax = new BitsType(module, string.Empty, lexer);
}
else if (temp == Symbol.Integer || temp == Symbol.Integer32)
{
_syntax = new IntegerType(module, string.Empty, lexer);
}
else if (temp == Symbol.Octet)
{
temp = lexer.GetNextSymbol();
temp.Expect(Symbol.String);
_syntax = new OctetStringType(module, string.Empty, lexer);
}
else if (temp == Symbol.Opaque)
{
_syntax = new OctetStringType(module, string.Empty, lexer);
}
else if (temp == Symbol.IpAddress)
{
_syntax = new IpAddressType(module, string.Empty, lexer);
}
else if (temp == Symbol.Counter64)
{
_syntax = new Counter64Type(module, string.Empty, lexer);
}
else if (temp == Symbol.Unsigned32 || temp == Symbol.Counter32 || temp == Symbol.Gauge32 || temp == Symbol.TimeTicks)
{
_syntax = new UnsignedType(module, string.Empty, lexer);
}
else if (temp == Symbol.Object)
{
temp = lexer.GetNextSymbol();
temp.Expect(Symbol.Identifier);
_syntax = new ObjectIdentifierType(module, string.Empty, lexer);
}
else
{
//temp.Throw("illegal syntax for textual convention");
_syntax = new CustomType(module, string.Empty, lexer);
}
}