:- use_module(library(lineutils),
	[file_filter_with_init/5,
	 split/3]).

:- use_module(library(lists),
	[append/2]).

:- initialization(main).

:- yap_flag(write_strings,on).

main :-
	warning(Warning),
	nb_setval(atom_counter,0),
	nb_setval(functor_counter,0),
	file_filter_with_init('misc/SWIATOMS','include/dswiatoms.h',gen_defs, Warning, ['dswiatoms.h']),
	open('include/dswiatoms.h',append,W),
	nb_getval(atom_counter,SWIAtoms),
	nb_getval(functor_counter,SWIFunctors),
	format(W,'~n~n#define N_SWI_ATOMS ~d~n',[SWIAtoms]),
	format(W,'#define N_SWI_FUNCTORS ~d~n',[SWIFunctors]),
	HashSizeBits is msb(SWIAtoms+SWIFunctors)+2,
	HashSize is 2^HashSizeBits,
	format(W,'#define N_SWI_HASH_BITS ~d~n',[HashSizeBits]),
	format(W,'#define N_SWI_HASH ~d~n',[HashSize]),
	close(W),
	file_filter_with_init('misc/SWIATOMS','H/iswiatoms.h',gen_init, Warning, ['iswiatoms.h']).

warning('~n  /* This file, ~a, was generated automatically~n     by calling \"yap -L misc/buildswiatoms\"~n     and is based on SWIATOMS, copied from the SWI-Prolog distribution~n     please do not update */~n~n').

gen_defs(Inp,Out) :-
	split(Inp,"	 ",["A",Atom,_]), !,
	nb_getval(atom_counter, Pos),
	NPos is Pos+1,
	nb_setval(atom_counter, NPos),
	OffPos is Pos*2+1,
	number_codes(OffPos, Val),
	append(["#define ATOM_",Atom," ",Val], Out).
gen_defs(Inp,Out) :-
	split(Inp,"	 ",["F",Functor,Arity]), !,
	nb_getval(functor_counter, Pos),
	NPos is Pos+1,
	nb_setval(functor_counter, NPos),
	OffPos is Pos*2+1,
	number_codes(OffPos, Val),
	append(["#define FUNCTOR_",Functor,Arity," ",Val], Out).


gen_init(Inp,Out) :-
	split(Inp," 	",["A",_,String]), !,
	append(["  SWI_Atoms[i++] = Yap_LookupAtom(",String,");"],Out).
gen_init(Inp,Out) :-
	split(Inp," 	",["F",String,Arity]), !,
	append(["  SWI_Functors[j++] = Yap_MkFunctor(SWIAtomToAtom(ATOM_",String,"),",Arity,");"],Out).