346 lines
7.9 KiB
Prolog
346 lines
7.9 KiB
Prolog
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: init.yap *
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* Last rev: *
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* mods: *
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* comments: initializing the full prolog system *
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* *
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*************************************************************************/
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/**
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@addtogroup YAPControl
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@{
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*/
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:- system_module( '$_init', [!/0,
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(:-)/1,
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(?-)/1,
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[]/0,
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extensions_to_present_answer/1,
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fail/0,
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false/0,
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goal_expansion/2,
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goal_expansion/3,
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otherwise/0,
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prolog_booting/0,
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term_expansion/2,
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version/2,
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'$do_log_upd_clause'/6,
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'$do_log_upd_clause0'/6,
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'$do_log_upd_clause_erase'/6,
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'$do_static_clause'/5], [
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'$system_module'/1]).
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:- use_system_module( '$_boot', ['$cut_by'/1]).
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'prolog_booting'.
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% This is yap's init file
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% should be consulted first step after booting
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% These are pseudo declarations
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% so that the user will get a redefining system predicate
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/** @pred fail is iso
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Always fails.
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*/
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fail :- fail.
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/** @pred false is iso
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The same as fail.
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*/
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false :- fail.
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otherwise.
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!.
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(:- G) :- '$execute'(G), !.
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(?- G) :- '$execute'(G).
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'$$!'(CP) :- '$cut_by'(CP).
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[] :- true.
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:- set_value('$doindex',true).
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% just create a choice-point
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% the 6th argument marks the time-stamp.
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'$do_log_upd_clause'(_,_,_,_,_,_).
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'$do_log_upd_clause'(A,B,C,D,E,_) :-
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'$continue_log_update_clause'(A,B,C,D,E).
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'$do_log_upd_clause'(_,_,_,_,_,_).
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'$do_log_upd_clause_erase'(_,_,_,_,_,_).
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'$do_log_upd_clause_erase'(A,B,C,D,E,_) :-
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'$continue_log_update_clause_erase'(A,B,C,D,E).
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'$do_log_upd_clause_erase'(_,_,_,_,_,_).
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'$do_log_upd_clause0'(_,_,_,_,_,_).
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'$do_log_upd_clause0'(A,B,C,D,_,_) :-
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'$continue_log_update_clause'(A,B,C,D).
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'$do_log_upd_clause0'(_,_,_,_,_,_).
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'$do_static_clause'(_,_,_,_,_).
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'$do_static_clause'(A,B,C,D,E) :-
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'$continue_static_clause'(A,B,C,D,E).
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'$do_static_clause'(_,_,_,_,_).
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:- '$handle_throw'(_,_,_), !.
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:- bootstrap('errors.yap').
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:- bootstrap('lists.yap').
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:- bootstrap('consult.yap').
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:- bootstrap('preddecls.yap').
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:- bootstrap('atoms.yap').
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:- bootstrap('os.yap').
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:- bootstrap('absf.yap').
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:- [ 'directives.yap',
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'utils.yap',
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'control.yap',
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'arith.yap',
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'flags.yap'
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].
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:- compile_expressions.
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:- [ 'preds.yap',
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'modules.yap'
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].
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:- [
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% lists is often used.
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'yio.yap',
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'debug.yap',
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'checker.yap',
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'depth_bound.yap',
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'grammar.yap',
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'ground.yap',
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'listing.yap',
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'arithpreds.yap',
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% modules must be after preds, otherwise we will have trouble
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% with meta-predicate expansion being invoked
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% must follow grammar
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'eval.yap',
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'signals.yap',
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'profile.yap',
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'callcount.yap',
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'load_foreign.yap',
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% 'save.yap',
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'setof.yap',
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'sort.yap',
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'statistics.yap',
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'strict_iso.yap',
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'tabling.yap',
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'threads.yap',
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'eam.yap',
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'chtypes.yap',
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'yapor.yap',
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'qly.yap',
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'udi.yap'].
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:- meta_predicate(log_event(+,:)).
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:- dynamic prolog:'$user_defined_flag'/4.
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:- dynamic prolog:'$parent_module'/2.
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:- multifile prolog:debug_action_hook/1.
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:- ['protect.yap'].
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version(yap,[6,3]).
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:- op(1150,fx,(mode)).
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:- dynamic 'extensions_to_present_answer'/1.
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:- ['arrays.yap'].
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:- use_module('messages.yap').
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:- use_module('hacks.yap').
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:- use_module('attributes.yap').
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:- use_module('corout.yap').
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:- use_module('dialect.yap').
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:- use_module('history.pl').
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:- use_module('dbload.yap').
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:- use_module('swi.yap').
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:- use_module('../swi/library/predopts.pl').
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:- use_module('../swi/library/menu.pl').
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:- use_module('../library/ypp.yap').
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yap_hacks:cut_by(CP) :- '$$cut_by'(CP).
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:- '$change_type_of_char'(36,7). % Make $ a symbol character
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:- '$swi_set_prolog_flag'(generate_debug_info,true).
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:- recorda('$dialect',yap,_).
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%
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% cleanup ensure loaded and recover some data-base space.
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%
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:- ( recorded('$lf_loaded',_,R), erase(R), fail ; true ).
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:- ( recorded('$module',_,R), erase(R), fail ; true ).
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:- set_value('$user_module',user), '$protect'.
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:- style_check([-discontiguous,-multiple,-single_var]).
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%
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% moved this to init_gc in gc.c to separate the alpha
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%
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% :- yap_flag(gc,on).
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% :- yap_flag(gc_trace,verbose).
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:- multifile
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prolog:comment_hook/3.
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:- source.
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:- module(user).
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/** @pred _CurrentModule_:goal_expansion(+ _G_,+ _M_,- _NG_), user:goal_expansion(+ _G_,+ _M_,- _NG_)
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YAP now supports goal_expansion/3. This is an user-defined
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procedure that is called after term expansion when compiling or
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asserting goals for each sub-goal in a clause. The first argument is
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bound to the goal and the second to the module under which the goal
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_G_ will execute. If goal_expansion/3 succeeds the new
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sub-goal _NG_ will replace _G_ and will be processed in the same
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way. If goal_expansion/3 fails the system will use the default
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rules.
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*/
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:- multifile goal_expansion/3.
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:- dynamic goal_expansion/3.
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:- multifile goal_expansion/2.
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:- dynamic goal_expansion/2.
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:- multifile system:goal_expansion/2.
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:- dynamic system:goal_expansion/2.
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:- multifile goal_expansion/2.
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:- dynamic goal_expansion/2.
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/** @pred _CurrentModule_:term_expansion( _T_,- _X_), user:term_expansion( _T_,- _X_)
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This user-defined predicate is called by `expand_term/3` to
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preprocess all terms read when consulting a file. If it succeeds:
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+
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If _X_ is of the form `:- G` or `?- G`, it is processed as
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a directive.
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+
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If _X_ is of the form `$source_location`( _File_, _Line_): _Clause_` it is processed as if from `File` and line `Line`.
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+
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If _X_ is a list, all terms of the list are asserted or processed
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as directives.
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+ The term _X_ is asserted instead of _T_.
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*/
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:- multifile term_expansion/2.
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:- dynamic term_expansion/2.
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:- multifile system:term_expansion/2.
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:- dynamic system:term_expansion/2.
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:- multifile swi:swi_predicate_table/4.
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/** @pred user:message_hook(+ _Term_, + _Kind_, + _Lines_)
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Hook predicate that may be define in the module `user` to intercept
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messages from print_message/2. _Term_ and _Kind_ are the
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same as passed to print_message/2. _Lines_ is a list of
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format statements as described with print_message_lines/3.
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This predicate should be defined dynamic and multifile to allow other
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modules defining clauses for it too.
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*/
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:- multifile user:message_hook/3.
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:- dynamic user:message_hook/3.
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:- multifile user:portray_message/2.
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:- dynamic user:portray_message/2.
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/** @pred exception(+ _Exception_, + _Context_, - _Action_)
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Dynamic predicate, normally not defined. Called by the Prolog system on run-time exceptions that can be repaired `just-in-time`. The values for _Exception_ are described below. See also catch/3 and throw/1.
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If this hook predicate succeeds it must instantiate the _Action_ argument to the atom `fail` to make the operation fail silently, `retry` to tell Prolog to retry the operation or `error` to make the system generate an exception. The action `retry` only makes sense if this hook modified the environment such that the operation can now succeed without error.
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+ `undefined_predicate`
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_Context_ is instantiated to a predicate-indicator ( _Module:Name/Arity_). If the predicate fails Prolog will generate an existence_error exception. The hook is intended to implement alternatives to the SWI built-in autoloader, such as autoloading code from a database. Do not use this hook to suppress existence errors on predicates. See also `unknown`.
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+ `undefined_global_variable`
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_Context_ is instantiated to the name of the missing global variable. The hook must call nb_setval/2 or b_setval/2 before returning with the action retry.
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*/
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:- multifile user:exception/3.
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:- dynamic user:exception/3.
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:- yap_flag(user:unknown,error).
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:- stream_property(user_input, tty(true)) -> set_prolog_flag(readline, true) ; true.
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/**
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@}
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*/
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