/usr/share/Yap/pl/eam.yap is in yap 5.1.3-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* BEAM extends the YAP Prolog system to support the EAM *
* *
* Copyright Ricardo Lopes and Universidade do Porto 2000-2006 *
* *
**************************************************************************
* *
* File: eam.yap *
* Last rev: 6/4/2006 *
* mods: *
* comments: Some utility predicates needed by BEAM *
* *
*************************************************************************/
eamtrans(A,A):- var(A),!.
eamtrans((A,B),(C,D)):- !, eamtrans(A,C),eamtrans(B,D).
eamtrans((X is Y) ,(skip_while_var(Vars), X is Y )):- !, '$variables_in_term'(Y,[],Vars).
eamtrans((X =\= Y),(skip_while_var(Vars), X =\= Y )):- !, '$variables_in_term'(X + Y,[],Vars).
eamtrans((X =:= Y),(skip_while_var(Vars), X =:= Y )):- !, '$variables_in_term'(X + Y,[],Vars).
eamtrans((X >= Y) ,(skip_while_var(Vars), X >= Y )):- !, '$variables_in_term'(X + Y,[],Vars).
eamtrans((X > Y) ,(skip_while_var(Vars), X > Y )):- !, '$variables_in_term'(X + Y,[],Vars).
eamtrans((X < Y) ,(skip_while_var(Vars), X < Y )):- !, '$variables_in_term'(X + Y,[],Vars).
eamtrans((X =< Y) ,(skip_while_var(Vars), X =< Y )):- !, '$variables_in_term'(X + Y,[],Vars).
eamtrans((X @>= Y) ,(skip_while_var(Vars), X @>= Y )):- !, '$variables_in_term'(X + Y,[],Vars).
eamtrans((X @> Y) ,(skip_while_var(Vars), X @> Y )):- !, '$variables_in_term'(X + Y,[],Vars).
eamtrans((X @< Y) ,(skip_while_var(Vars), X @< Y )):- !, '$variables_in_term'(X + Y,[],Vars).
eamtrans((X @=< Y) ,(skip_while_var(Vars), X @=< Y )):- !, '$variables_in_term'(X + Y,[],Vars).
eamtrans((X \= Y) ,(skip_while_var(Vars), X \= Y )):- !, '$variables_in_term'(X + Y,[],Vars).
eamtrans((X \== Y),(skip_while_var(Vars), X \== Y )):- !, '$variables_in_term'(X + Y,[],Vars).
eamtrans(B,B).
eamconsult(File):- eam, eam, %fails if eam is disable
assert((user:term_expansion((A :- B),(A :- C)):- eamtrans(B,C))),
eam, ( consult(File) ; true), eam,
abolish(user:term_expansion,2).
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