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yap-6.3/pl/absf.yap
2013-12-14 11:06:09 +00:00

326 lines
12 KiB
Prolog

/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: consult.yap *
* Last rev: 8/2/88 *
* mods: *
* comments: Consulting Files in YAP *
* *
*************************************************************************/
absolute_file_name(V,Out) :- var(V), !,
'$do_error'(instantiation_error, absolute_file_name(V, Out)).
absolute_file_name(user,user) :- !.
absolute_file_name(File0,File) :-
'$absolute_file_name'(File0,[access(none),file_type(txt),file_errors(fail),solutions(first)],File,absolute_file_name(File0,File)).
'$full_filename'(F0,F,G) :-
'$absolute_file_name'(F0,[access(read),file_type(source),file_errors(fail),solutions(first),expand(true)],F,G).
% fix wrong argument order, TrueFileName should be last.
absolute_file_name(File,TrueFileName,Opts) :-
( var(TrueFileName) -> true ; atom(TrueFileName), TrueFileName \= [] ),
!,
absolute_file_name(File,Opts,TrueFileName).
absolute_file_name(File,Opts,TrueFileName) :-
'$absolute_file_name'(File,Opts,TrueFileName,absolute_file_name(File,Opts,TrueFileName)).
'$absolute_file_name'(File, _Opts, _TrueFileName, G) :- var(File), !,
'$do_error'(instantiation_error, G).
'$absolute_file_name'(File,Opts,TrueFileName, G) :-
'$process_fn_opts'(Opts,Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,G),
/* our own local findall */
nb:nb_queue(Ref),
(
'$find_in_path'(File,opts(Extensions,RelTo,Type,Access,FErrors,Expand,Debug),TrueFileName,G),
nb:nb_queue_enqueue(Ref, TrueFileName),
fail
;
nb:nb_queue_close(Ref, FileNames, [])
),
'$absolute_file_names'(Solutions, FileNames, FErrors, TrueFileName, File, G).
'$absolute_file_names'(_Solutions, [], error, _, File, G) :- !,
'$do_error'(existence_error(file,File),G).
'$absolute_file_names'(Solutions, FileNames, _, TrueFileName, _, _) :-
lists:member(TrueFileName, FileNames),
(Solutions == first -> ! ; true).
'$process_fn_opts'(V,_,_,_,_,_,_,_,_,G) :- var(V), !,
'$do_error'(instantiation_error, G).
'$process_fn_opts'([],[],_,txt,none,error,first,false,false,_) :- !.
'$process_fn_opts'([Opt|Opts],Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,G) :- !,
'$process_fn_opt'(Opt,Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions0,RelTo0,Type0,Access0,FErrors0,Solutions0,Expand0,Debug0,G),
'$process_fn_opts'(Opts,Extensions0,RelTo0,Type0,Access0,FErrors0,Solutions0,Expand0,Debug0,G).
'$process_fn_opts'(Opts,_Extensions,_RelTo,_Type,_Access,_FErrors,_Solutions,_Expand,_Debug,G) :- !,
'$do_error'(type_error(list,Opts),G).
'$process_fn_opt'(Opt,Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,G) :- var(Opt), !,
'$do_error'(instantiation_error, G).
'$process_fn_opt'(extensions(Extensions),Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,_,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,G) :- !,
'$check_fn_extensions'(Extensions,G).
'$process_fn_opt'(relative_to(RelTo),Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions,_,Type,Access,FErrors,Solutions,Expand,Debug,G) :- !,
'$check_atom'(RelTo,G).
'$process_fn_opt'(access(Access),Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions,RelTo,Type,_,FErrors,Solutions,Expand,Debug,G) :- !,
'$check_atom'(Access,G).
'$process_fn_opt'(file_type(Type),Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions,RelTo,_,Access,FErrors,Solutions,Expand,Debug,G) :- !,
'$check_fn_type'(Type,G).
'$process_fn_opt'(file_errors(FErrors),Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions,RelTo,Type,Access,_,Solutions,Expand,Debug,G) :- !,
'$check_fn_errors'(FErrors,G).
'$process_fn_opt'(solutions(Solutions),Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions,RelTo,Type,Access,FErrors,_,Expand,Debug,G) :- !,
'$check_fn_solutions'(Solutions,G).
'$process_fn_opt'(expand(Expand),Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions,RelTo,Type,Access,FErrors,Solutions,_,Debug,G) :- !,
'$check_true_false'(Expand,G).
'$process_fn_opt'(verbose_file_search(Debug),Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,_,G) :- !,
'$check_true_false'(Debug,G).
'$process_fn_opt'(Opt,Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,Extensions,RelTo,Type,Access,FErrors,Solutions,Expand,Debug,G) :- !,
'$do_error'(domain_error(file_name_option,Opt),G).
'$check_fn_extensions'(V,G) :- var(V), !,
'$do_error'(instantiation_error, G).
'$check_fn_extensions'([],_) :- !.
'$check_fn_extensions'([A|L],G) :- !,
'$check_atom'(A,G),
'$check_fn_extensions'(L,G).
'$check_fn_extensions'(T,G) :- !,
'$do_error'(type_error(list,T),G).
'$check_atom'(V,G) :- var(V), !,
'$do_error'(instantiation_error, G).
'$check_atom'(A,_G) :- atom(A), !.
'$check_atom'(T,G) :- !,
'$do_error'(type_error(atom,T),G).
'$check_fn_type'(V,G) :- var(V), !,
'$do_error'(instantiation_error, G).
'$check_fn_type'(txt,_) :- !.
'$check_fn_type'(prolog,_) :- !.
'$check_fn_type'(source,_) :- !.
'$check_fn_type'(executable,_) :- !.
'$check_fn_type'(qlf,_) :- !.
'$check_fn_type'(directory,_) :- !.
'$check_fn_type'(T,G) :- atom(T), !,
'$do_error'(domain_error(file_type,T),G).
'$check_fn_type'(T,G) :- !,
'$do_error'(type_error(atom,T),G).
'$check_fn_errors'(V,G) :- var(V), !,
'$do_error'(instantiation_error, G).
'$check_fn_errors'(fail,_) :- !.
'$check_fn_errors'(error,_) :- !.
'$check_fn_errors'(T,G) :- atom(T), !,
'$do_error'(domain_error(file_errors,T),G).
'$check_fn_errors'(T,G) :- !,
'$do_error'(type_error(atom,T),G).
'$check_fn_solutions'(V,G) :- var(V), !,
'$do_error'(instantiation_error, G).
'$check_fn_solutions'(first,_) :- !.
'$check_fn_solutions'(all,_) :- !.
'$check_fn_solutions'(T,G) :- atom(T), !,
'$do_error'(domain_error(solutions,T),G).
'$check_fn_solutions'(T,G) :- !,
'$do_error'(type_error(atom,T),G).
'$check_true_false'(V,G) :- var(V), !,
'$do_error'(instantiation_error, G).
'$check_true_false'(true,_) :- !.
'$check_true_false'(false,_) :- !.
'$check_true_false'(T,G) :- atom(T), !,
'$do_error'(domain_error(boolean,T),G).
'$check_true_false'(T,G) :- !,
'$do_error'(type_error(atom,T),G).
% This sequence must be followed:
% user and user_input are special;
% library(F) must check library_directories
% T(F) must check file_search_path
% all must try search in path
'$find_in_path'(user,_,user_input, _) :- !.
'$find_in_path'(user_input,_,user_input, _) :- !.
'$find_in_path'(commons(D),_,_, _) :-
% make sure library_directory is open.
\+ clause(user:commons_directory(_),_),
'$system_commons_directories'(D),
assert(user:commons_directory(D)),
fail.
'$find_in_path'(S, Opts, NewFile, Call) :-
S =.. [Name,File0],
'$cat_file_name'(File0,File1), !,
'$expand_file_name'(File1, File),
'$dir_separator'(D),
atom_codes(A,[D]),
'$extend_path_directory'(Name, A, File, Opts, NewFile, Call).
'$find_in_path'(File0,Opts,NewFile,_) :-
'$cat_file_name'(File0,File1), !,
'$expand_file_name'(File1, File),
'$add_path'(File,PFile),
'$get_abs_file'(PFile,Opts,AbsFile),
'$search_in_path'(AbsFile,Opts,NewFile).
'$find_in_path'(File,_,_,Call) :-
'$do_error'(domain_error(source_sink,File),Call).
% allow paths in File Name
'$cat_file_name'(File0,File) :-
atom(File0), !,
File = File0.
'$cat_file_name'(Atoms, File) :-
'$to_list_of_atoms'(Atoms, List, []),
atom_concat(List, File).
'$to_list_of_atoms'(V, _, _) :- var(V), !, fail.
'$to_list_of_atoms'(Atom, [Atom|L], L) :- atom(Atom), !.
'$to_list_of_atoms'(Atoms, L1, LF) :-
Atoms =.. [A,As,Bs],
atom_codes(A,[D]),
'$dir_separator'(D),
'$to_list_of_atoms'(As, L1, [A|L2]),
'$to_list_of_atoms'(Bs, L2, LF).
'$get_abs_file'(File,opts(_,RelTo,_,_,_,Expand,_),AbsFile) :-
(
nonvar(RelTo)
->
( is_absolute_file_name(File) ->
ActualFile = File
;
'$dir_separator'(D),
atom_codes(DA,[D]),
atom_concat([RelTo, DA, File], ActualFile)
)
;
ActualFile = File
),
'$swi_current_prolog_flag'(file_name_variables, OldF),
'$swi_set_prolog_flag'(file_name_variables, Expand),
(
'$absolute_file_name'(ActualFile,AbsFile)
->
'$swi_set_prolog_flag'(file_name_variables, OldF)
;
'$swi_set_prolog_flag'(file_name_variables, OldF),
fail
).
'$search_in_path'(File,opts(Extensions,_,Type,Access,_,_,_),F) :-
'$add_extensions'(Extensions, File, F0),
'$check_file'(F0, Type, Access, F).
'$search_in_path'(File,opts(_,_,Type,Access,_,_,_),F) :-
'$add_type_extensions'(Type, File, F0),
'$check_file'(F0, Type, Access, F).
'$check_file'(F, _Type, none, F) :- !.
'$check_file'(F0, Type, Access, F0) :-
access_file(F0, Access),
(Type == directory ->
exists_directory(F0)
;
\+ exists_directory(F0) % if it has a type cannot be a directory.
).
'$add_extensions'([Ext|_],File,F) :-
'$mk_sure_true_ext'(Ext,NExt),
atom_concat([File,NExt],F).
'$add_extensions'([_|Extensions],File,F) :-
'$add_extensions'(Extensions,File,F).
'$mk_sure_true_ext'(Ext,NExt) :-
atom_codes(Ext,[C|L]),
C \= 0'.,
!,
atom_codes(NExt,[0'.,C|L]).
'$mk_sure_true_ext'(Ext,Ext).
'$add_type_extensions'(Type,File,F) :-
( Type == source -> NType = prolog ; NType = Type ),
user:prolog_file_type(Ext, NType),
atom_concat([File,'.',Ext],F).
'$add_type_extensions'(_,File,File).
'$add_path'(File,File) :-
'$dir_separator'(D),
atom_codes(DA,[D]),
sub_atom(File, 0, 1, _, DA), !.
'$add_path'(File,File).
'$add_path'(File,PFile) :-
recorded('$path',Path,_),
atom_concat([Path,File],PFile).
'$system_library_directories'(Dir) :-
getenv('YAPSHAREDIR', Dirs),
'$split_by_sep'(0, 0, Dirs, Dir).
'$system_library_directories'(Dir) :-
getenv('YAPCOMMONSDIR', Dirs),
'$split_by_sep'(0, 0, Dirs, Dir).
'$system_library_directories'(Dir) :-
get_value(system_library_directory,Dir).
'$system_library_directories'(Dir) :-
get_value(prolog_commons_directory,Dir).
'$split_by_sep'(Start, Next, Dirs, Dir) :-
'$swi_current_prolog_flag'(windows, true), !,
'$split_by_sep'(Start, Next, Dirs, ';', Dir).
'$split_by_sep'(Start, Next, Dirs, Dir) :-
'$split_by_sep'(Start, Next, Dirs, ':', Dir).
'$split_by_sep'(Start, Next, Dirs, Sep, Dir) :-
sub_atom(Dirs, Next, 1, _, Let), !,
'$continue_split_by_sep'(Let, Start, Next, Dirs, Sep, Dir).
'$split_by_sep'(Start, Next, Dirs, _Sep, Dir) :-
Next > Start,
Len is Next-Start,
sub_atom(Dirs, Start, Len, _, Dir).
% closed a directory
'$continue_split_by_sep'(Sep, Start, Next, Dirs, Sep, Dir) :-
Sz is Next-Start,
Sz > 0,
sub_atom(Dirs, Start, Sz, _, Dir).
% next dir
'$continue_split_by_sep'(Sep , _Start, Next, Dirs, Sep, Dir) :- !,
N1 is Next+1,
'$split_by_sep'(N1, N1, Dirs, Dir).
% same dir
'$continue_split_by_sep'(_Let, Start, Next, Dirs, Sep, Dir) :-
N1 is Next+1,
'$split_by_sep'(Start, N1, Dirs, Sep, Dir).
'$extend_path_directory'(_Name, D, File, _Opts, File, Call) :-
is_absolute_file_name(File), !.
'$extend_path_directory'(Name, D, File, Opts, NewFile, Call) :-
user:file_search_path(Name, IDirs),
( atom(IDirs) ->
'$split_by_sep'(0, 0, IDirs, Dir)
;
Dir = IDirs
),
'$extend_pathd'(Dir, D, File, Opts, NewFile, Call).
'$extend_pathd'(Dir, A, File, Opts, NewFile, Goal) :-
atom(Dir), !,
'$add_file_to_dir'(Dir,A,File,NFile),
'$find_in_path'(NFile, Opts, NewFile, Goal), !.
'$extend_pathd'(Name, A, File, Opts, OFile, Goal) :-
nonvar(Name),
Name =.. [N,P0],
'$add_file_to_dir'(P0,A,File,NFile),
NewName =.. [N,NFile],
'$find_in_path'(NewName, Opts, OFile, Goal).
'$add_file_to_dir'(P0,A,Atoms,NFile) :-
atom_concat([P0,A,Atoms],NFile).