C syntax with a 'hack' and a caveat should now work in Felix.
The syntax is not full C, but these should work:
function definitions
variables and parameters like 'int x'
typedefs
struct
union
which I think is all of C... :)
[Felix enum is already the same as C]
Please LOOK at the grammar in flx_nugram.flxh, with DSSL csyntax.
The hack is that you will NEED to put a semi-colon after
function definitions:
int f(int x) { return x; }; //<--- ; needed
so that the ambiguity resolver can work: the above
statement is ambiguous (it could also be interpreted
as a call of (int f) applied to (int x) and { return x; }
which are all legal Felix expressions.
The parser resolves statement ambiguities in favour
of C, not Felix.
CAVEAT. There is a problem with function types.
Felix has two types of functions: Felix functions, modelled
by C++ classes, and C functions. The notations are
d -> c // felix function
d --> c // C function
Calling these is the same .. the difference is in their closures.
Felix function closures point at C++ class objects with an apply()
method, whereas C function closures are just ordinary C function
pointers.
THIS thing:
int f(int x) { return x; };
defines a FELIX function, not a C function. Thus,
you can nest them, etc etc: the above is just an alternate
syntax for Felix function definition and is the same as
fun f(x:int):int= { return x; };
The question is what to do with
typedef int (f)(int);
typedef int (*fp)(int);
At present these both denote C function pointers:
int --> int
which isn't really consistent with C syntax function definitions
denoting Felix, and not C functions.
--
John Skaller <skaller at users dot sf dot net>
Felix, successor to C++: http://felix.sf.net
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