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yap-6.3/pl/swi.yap
Vitor Santos Costa 1c293a9af4 docs
2018-04-27 13:01:08 +01:00

115 lines
2.7 KiB
Prolog

/**
* @file pl/swi.yap
* @author VITOR SANTOS COSTA <vsc@VITORs-MBP-2.lan>
* @date Thu Oct 19 12:18:05 2017
*
* @brief SWI Emulation support
*
* @ingroup dialects
*
*
*/
:- module('$swi',
[]).
%% file_alias_path(-Alias, ?Dir) is nondet.
%
% True if file Alias points to Dir. Multiple solutions are
% generated with the longest directory first.
%% file_name_on_path(+File:atom, -OnPath) is det.
%
% True if OnPath a description of File based on the file search
% path. This performs the inverse of absolute_file_name/3.
prolog:file_name_on_path(Path, ShortId) :-
( prolog:file_alias_path(Alias, Dir),
atom_concat(Dir, Local, Path)
-> ( Alias == '.'
-> ShortId = Local
; file_name_extension(Base, pl, Local)
-> ShortId =.. [Alias, Base]
; ShortId =.. [Alias, Local]
)
; ShortId = Path
).
:- dynamic
alias_cache/2.
prolog:file_alias_path(Alias, Dir) :-
( alias_cache(_, _)
-> true
; build_alias_cache
),
( nonvar(Dir)
-> ensure_slash(Dir, DirSlash),
alias_cache(Alias, DirSlash)
; alias_cache(Alias, Dir)
).
build_alias_cache :-
findall(t(DirLen, AliasLen, Alias, Dir),
search_path(Alias, Dir, AliasLen, DirLen), Ts),
sort(Ts, List0),
reverse(List0, List),
forall(lists:member(t(_, _, Alias, Dir), List),
assert(alias_cache(Alias, Dir))).
search_path('.', Here, 999, DirLen) :-
working_directory(Here0, Here0),
ensure_slash(Here0, Here),
atom_length(Here, DirLen).
search_path(Alias, Dir, AliasLen, DirLen) :-
user:file_search_path(Alias, _),
Alias \== autoload,
Spec =.. [Alias,'.'],
atom_length(Alias, AliasLen0),
AliasLen is 1000 - AliasLen0, % must do reverse sort
absolute_file_name(Spec, Dir0,
[ file_type(directory),
access(read),
solutions(all),
file_errors(fail)
]),
ensure_slash(Dir0, Dir),
atom_length(Dir, DirLen).
ensure_slash(Dir, Dir) :-
sub_atom(Dir, _, _, 0, /), !.
ensure_slash(Dir0, Dir) :-
atom_concat(Dir0, /, Dir).
/** @pred reverse(+ _List_, ? _Reversed_)
True when _List_ and _Reversed_ are lists with the same elements
but in opposite orders.
*/
reverse(List, Reversed) :-
reverse(List, [], Reversed).
reverse([], Reversed, Reversed).
reverse([Head|Tail], Sofar, Reversed) :-
reverse(Tail, [Head|Sofar], Reversed).
%% win_add_dll_directory(+AbsDir) is det.
%
% Add AbsDir to the directories where dependent DLLs are searched
% on Windows systems.
:- if(current_prolog_flag(windows, true)).
prolog:win_add_dll_directory(Dir) :-
win_add_dll_directory(Dir, _), !.
prolog:win_add_dll_directory(Dir) :-
prolog_to_os_filename(Dir, OSDir),
getenv('PATH', Path0),
atomic_list_concat([Path0, OSDir], ';', Path),
setenv('PATH', Path).
:- endif.