51 lines
1.6 KiB
Prolog
51 lines
1.6 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: protect.yap *
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* Last rev: *
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* mods: *
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* comments: protecting the system functions *
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* *
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*************************************************************************/
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% This protects all code from further changes
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% and also makes it impossible from some predicates to be seen
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'$protect' :-
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current_atom(Name),
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atom_codes(Name,[0'$|_]),
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'$hide_predicates'(Name),
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'$hide'(Name).
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'$protect' :-
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'$hide_predicates'(bootstrap),
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'$hide'(bootstrap).
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'$protect'.
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'$hide_predicates'(Name) :-
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'$current_predicate_for_atom'(Name, prolog, P),
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'$hide_predicate'(P,prolog),
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fail.
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'$hide_predicates'(_).
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% hide all atoms who start by '$'
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'$hide'('$VAR') :- !, fail. /* not $VAR */
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'$hide'('$dbref') :- !, fail. /* not stream position */
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'$hide'('$stream') :- !, fail. /* not $STREAM */
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'$hide'('$stream_position') :- !, fail. /* not stream position */
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'$hide'('$hacks') :- !, fail.
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'$hide'('$source_location') :- !, fail.
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'$hide'('$messages') :- !, fail.
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'$hide'('$push_input_context') :- !, fail.
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'$hide'('$pop_input_context') :- !, fail.
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'$hide'('$set_source_module') :- !, fail.
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'$hide'('$declare_module') :- !, fail.
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'$hide'('$store_clause') :- !, fail.
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'$hide'(Name) :- hide(Name), fail.
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