The Felix compiler supports a new experimental option:
/////////////////////////////////////////
include "flx_faio";
var clock = Faio::mk_alarm_clock();
var i = 0;
proc foo(x: int, y: int) {
print x; endl; print y; endl;
Faio::sleep (clock,1.0);
whilst i < 10 do print "hi"; endl; ++i; endl; done;
}
export proc foo of (int*int) as "foo";
/////////////
[EMAIL PROTECTED]:/work/felix/svn/felix/felix/trunk$ bin/flxg -Ilib xx1
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
; print y ; endl ; Faio :: sleep ( clock , 1.0 ) ; whilst i < 10 do
Syntax Error before token 53 in xx1.flx, line 10 col 22
print "hi" ; endl ; ++ i ; endl ; done ; }
0: export proc foo of ( int * int
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Flx_exceptions.ParseError("Error parsing input")
PARSE ERROR
Unknown exception Parsing File
///////////////////////////////////////////////////
[EMAIL PROTECTED]:/work/felix/svn/felix/felix/trunk$ bin/flxg \
-Ilib --hash-include=lib/std.flx xx1
////////////////////////////////////////////
The option -hash-include=filename, which can be repeated
any number of times, creates a token stream by successively
preprocessing all the hash-include files, followed by the
main file.
In other words, the above code can be compiled even though
it uses a syntax extension 'whilst' defined in lib/std.flx
It also worked with --hash-include=lib/flx.flxh
You should note what happens is that the token stream
created by preprocessing is merely concatenated.
This is achieved by the Ocaml code:
let pre_tokens =
List.concat
(List.map
(fun filename ->
Flx_pretok.pre_tokens_of_filename
filename
basedir
include_dirs
expand_expr
)
filenames
)
in
pre_tokens_of_filename looks like:
let pre_tokens_of_filename filename dirname incdirs expand_expr =
let state = new Flx_lexstate.lexer_state filename dirname incdirs
expand_expr in
let infile = open_in filename in
let src = Lexing.from_channel infile in
let toks = pre_tokens_of_lexbuf src state in
close_in infile;
toks
Note that each file has a separate lexer state.
It is not clear if this hack is what we want.
However it does allow you to run scripts that do not
include the magic incantation
#include <flx.flxh>
at the top of the main file. Note you cannot omit the
summoning spell in included files (i.e. libraries),
only top level scripts: the effect isn't transitive.
--
John Skaller <skaller at users dot sf dot net>
Felix, successor to C++: http://felix.sf.net
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