public static new EXPRESSION parse(Token first, iSCOPE context)
{
EXPRESSION result = ADDITIVE.parse(first, context);
Token token = get();
switch (token.code)
{
case TokenCode.Less:
case TokenCode.LessEqual:
case TokenCode.Greater:
case TokenCode.GreaterEqual:
case TokenCode.Equal:
case TokenCode.NotEqual:
case TokenCode.EqualEqual:
case TokenCode.NotEqualDeep:
forget(); break;
case TokenCode.In:
forget();
EXPRESSION left = EXPRESSION.parse(null, context);
token = get();
if (token.code == TokenCode.DotDot)
{
forget();
EXPRESSION right = EXPRESSION.parse(null, context);
RANGE_TYPE range = new RANGE_TYPE(left, right);
range.setSpan(left.span, right.span);
Span start = result.span;
IN_EXPRESSION r = new IN_EXPRESSION(token, result, range);
result.parent = r;
result = r;
result.setSpan(start, range.span);
goto Out;
}
else
{
// Something's wrong: right part of the in-expression
// should always be a range-type
goto Out;
}
default:
goto Out;
}
EXPRESSION second = ADDITIVE.parse(null, context);
Span start2 = result.span;
result = new RELATIONAL(token, result, second);
result.setSpan(start2, second.span);
Out:
return(result);
}
/// <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);
}