public static TYPE parseTypeSpecifier(iSCOPE context, out bool ref_val, out bool conc, out Span final)
{
TYPE type = null;
bool opt = false;
ref_val = false; conc = false;
Token token = get();
Token begin = token;
if (token.code == TokenCode.Question)
{
forget(); token = get();
opt = true;
}
switch (token.code)
{
case TokenCode.As:
forget();
EXPRESSION example = PRIMARY.parse(null, context);
type = example.type;
if (type != null)
{
type.setSpan(begin.span, example.span);
if (type is UNIT_REF)
{
(type as UNIT_REF).setSpecs(opt, true);
}
}
final = example.span;
break;
case TokenCode.Ref: ref_val = true; forget(); goto ParseType;
case TokenCode.Concurrent: conc = true; forget(); goto ParseType;
case TokenCode.Val: forget(); goto ParseType;
case TokenCode.LParen:
// Seems to a tuple type
type = TUPLE_TYPE.parse(context);
context.add(type);
final = type.span;
break;
default:
// forget();
ParseType:
UNIT_REF unitRef = UNIT_REF.parse(null, opt, context);
if (unitRef == null) /* An error was detected earlier */
{
final = null; return(null);
}
final = unitRef.span;
token = get();
return(unitRef);
}
return(type);
}
public static TYPE parse(iSCOPE context)
{
Debug.Indent();
Debug.WriteLine("Entering TYPE.parse");
Token token = get();
TYPE result = null;
switch (token.code)
{
case TokenCode.LParen:
result = TUPLE_TYPE.parse(context);
break;
case TokenCode.Routine:
result = ROUTINE_TYPE.parse(context);
break;
case TokenCode.Identifier:
{
// Don't forget()
UNIT_REF unit_type = UNIT_REF.parse(null, false, context);
Token del = get();
if (del.code == TokenCode.Vertical)
{
// Don't call forget()
result = MULTI_TYPE.parse(unit_type, context);
}
else
{
result = unit_type;
}
break;
}
default: // Syntax error
{
break;
}
}
Debug.WriteLine("Exiting TYPE.parse");
Debug.Unindent();
return(result);
}
/// <summary>
///
/// </summary>
/// <returns></returns>
public static FORMAL_TYPE parse(Token id, iSCOPE context)
{
Debug.Indent();
Debug.WriteLine("Entering FORMAL_TYPE.parse");
// Identifier was parsed before and is passed via 'id'.
FORMAL_TYPE generic_type_par = new FORMAL_TYPE(id);
Token token = get();
if (token.code != TokenCode.Arrow2)
{
goto Finish;
}
// ->
TYPE base_type = null;
forget(); token = get();
if (token.code == TokenCode.Identifier)
{
forget();
base_type = UNIT_REF.parse(token, false, context);
}
else if (token.code == TokenCode.LParen) // T->(tuple)
{
base_type = TUPLE_TYPE.parse(context);
}
else
{
// Syntax error
}
generic_type_par.base_type = base_type;
token = get();
if (token.code != TokenCode.Init)
{
goto Finish;
}
forget(); token = get();
// init
if (token.code != TokenCode.LParen)
{
goto Finish;
}
forget(); token = get();
if (token.code == TokenCode.RParen)
{
forget(); goto Finish;
}
while (true)
{
TYPE init_param_type = TYPE.parse(context);
generic_type_par.add(init_param_type);
init_param_type.parent = generic_type_par;
token = get();
if (token.code == TokenCode.Comma)
{
forget(); continue;
}
break;
}
token = expect(TokenCode.RParen);
Finish:
Debug.WriteLine("Exiting FORMAL_TYPE.parse");
Debug.Unindent();
generic_type_par.setSpan(id, token);
return(generic_type_par);
}
/// <summary>
///
/// </summary>
/// <syntax>
/// UnitTypeName : CompoundName [ GenericInstantiation ]
///
/// GenericInstantiation : "[" (Type|Expression) { "," (Type|Expression) } "]"
/// </syntax>
/// <returns></returns>
public static UNIT_REF parse(Token id, bool opt, iSCOPE context)
{
Debug.Indent();
Debug.WriteLine("Entering UNIT_REF.parse");
Token token = null;
// We assume that 'id' is 'identifier'.
if (id == null)
{
token = get(); forget();
}
else
{
token = id;
}
token = IDENTIFIER.parseCompoundName(token);
if (token == null) /* an error was detected earlier */ return {
(null);
}
Token start = token;
UNIT_REF unit_ref = new UNIT_REF(token.image);
unit_ref.opt = opt;
unit_ref.as_sign = true;
DECLARATION unit = Context.find(token);
if (unit != null && (unit is UNIT || unit is FORMAL_TYPE))
{
unit_ref.unit_ref = unit;
}
token = get();
if (token.code == TokenCode.LBracket)
{
forget();
while (true)
{
TYPE type = null;
token = get();
if (token.code == TokenCode.LParen)
{
type = TUPLE_TYPE.parse(context);
unit_ref.add(type);
goto Delimiter;
}
EXPRESSION expr = EXPRESSION.parse(null, context);
if (expr is REFERENCE || expr is UNRESOLVED)
{
string name = null;
if (expr is REFERENCE)
{
if ((expr as REFERENCE).declaration is UNIT)
{
name = (expr as REFERENCE).declaration.name.identifier;
}
else
{
goto NonType;
}
}
else // UNRESOLVED
{
name = (expr as UNRESOLVED).name.identifier;
}
id = new Token(expr.span, TokenCode.Identifier, name, new Category(CategoryCode.identifier));
type = UNIT_REF.parse(id, false, context); // Recursive call
unit_ref.add(type);
type.parent = unit_ref;
goto Delimiter;
}
// else -- expr is perhaps a non-type argument
NonType:
token = get();
if (token.code == TokenCode.DotDot)
{
// This is actually a range _type_
forget();
EXPRESSION right = EXPRESSION.parse(null, context);
RANGE_TYPE range = new RANGE_TYPE(expr, right);
range.setSpan(expr.span, right.span);
unit_ref.add(range);
range.parent = unit_ref;
}
else // Definitely a non-type argument
{
unit_ref.add(expr);
expr.parent = unit_ref;
}
Delimiter:
token = get();
switch (token.code)
{
case TokenCode.Comma: forget(); continue;
case TokenCode.RBracket: forget(); goto Finish;
default: { /* Syntax error in generic actuals */ break; }
}
}
Finish:
unit_ref.setSpan(start.span, token.span);
}
else
{
unit_ref.setSpan(start);
}
Debug.WriteLine("Exiting UNIT_REF.parse");
Debug.Unindent();
return(unit_ref);
}
/// <summary>
///
/// </summary>
/// <returns></returns>
new public static TUPLE_TYPE parse(iSCOPE context)
{
Debug.Indent();
Debug.WriteLine("Entering TUPLE_TYPE.parse");
TUPLE_TYPE tuple = new TUPLE_TYPE();
Token begin = expect(TokenCode.LParen);
int count = 0;
Token token = get();
if (token.code == TokenCode.RParen)
{
// Empty tuple
forget(); goto OutLoop;
}
var ids = new List <Token>();
UNIT_REF unit_type;
while (true)
{
token = expect(TokenCode.Identifier);
Token delimiter = get();
switch (delimiter.code)
{
case TokenCode.Comma:
// Identifier is the current name in the list of fields
forget();
ids.Add(token);
continue;
case TokenCode.Colon:
// Identifier is the last name in the field of fields
forget();
ids.Add(token);
// Now we treat collected ids as names of tuple fields,
// and the construct following ':' as unit name.
unit_type = UNIT_REF.parse(null, false, context);
unit_type.parent = tuple;
foreach (Token id in ids)
{
if (tuple.exists(id.image)) // Error: duplicate name
{
}
else
{
tuple.add(id.image, unit_type);
}
}
token = get();
if (token.code == TokenCode.Is)
{
forget();
EXPRESSION expr = EXPRESSION.parse(null, context);
foreach (Token id in ids)
{
if (tuple.exists(id.image))
{
}
else
{
tuple.add(id.image, expr);
}
}
}
ids.Clear();
break;
case TokenCode.Is:
ids.Add(token);
// No explicit type for the field(s) but only initializer
forget();
EXPRESSION expr2 = EXPRESSION.parse(null, context);
foreach (Token id in ids)
{
if (tuple.exists(id.image)) // Error: duplicate name
{
}
else
{
tuple.add(id.image, expr2);
}
}
ids.Clear();
break;
case TokenCode.RParen:
case TokenCode.Semicolon:
forget();
Token stop = delimiter;
// ')': The end of the tuple type; this means that all previous ids were
// actually simple type names.
// ';': The end of the current part of the tuple type. Again, this means
// that all ids were type names.
// In both cases, field names were omitted, and we have to assign
// artifical names for those fields.
ids.Add(token);
foreach (Token id in ids)
{
unit_type = UNIT_REF.parse(id, false, context);
count++;
string n = "$" + count.ToString();
tuple.add(n, unit_type);
}
ids.Clear();
if (stop.code == TokenCode.Semicolon)
{
continue;
}
else
{
goto OutLoop;
}
case TokenCode.LBracket:
ids.Add(token);
// 'ids' collected before, are actually unit names:
// all of them before the last one, were simple names,
// and the last one is like 'name[...'.
foreach (Token id in ids)
{
unit_type = UNIT_REF.parse(id, false, context);
count++;
string n = "$" + count.ToString();
tuple.add(n, unit_type);
}
break;
} // switch
} // while
OutLoop:
tuple.setSpan(begin, token);
Debug.WriteLine("Exiting TUPLE_TYPE.parse");
Debug.Unindent();
return(tuple);
}
