76 lines
2.0 KiB
Plaintext
76 lines
2.0 KiB
Plaintext
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:- load_foreign_files(['libudi_b+tree'],[],udi_btree_init).
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:- op(700,fx,max).
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:- op(700,fx,min).
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:- op(700,xfx,#==).
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:- op(700,xfx,#>).
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:- op(700,xfx,#<).
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:- op(700,xfx,#>=).
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:- op(700,xfx,#=<).
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max X :- %%this overrides any previous att
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attributes:put_att_term(X,max(C)).
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min X :- %%this overrides any previous att
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attributes:put_att_term(X,min(C)).
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X #== Y :-%%this overrides any previous att
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attributes:put_att_term(X,eq(C,Y)).
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%% range definition
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X #> Y :-
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attributes:get_all_atts(X,C),
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c1(C,gt(_,Y),NC),
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attributes:put_att_term(X,NC).
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X #>= Y :-
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attributes:get_all_atts(X,C),
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c1(C,ge(_,Y),NC),
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attributes:put_att_term(X,NC).
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X #=< Y :-
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attributes:get_all_atts(X,C),
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c1(C,le(_,Y),NC),
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attributes:put_att_term(X,NC).
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X #< Y :-
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attributes:get_all_atts(X,C),
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c1(C,lt(_,Y),NC),
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attributes:put_att_term(X,NC).
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c1(A,X,X) :-
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var(A), !.
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c1(gt(_,X),gt(_,Y),gt(_,Z)) :-
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Z is max(X,Y).
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c1(gt(_,X),ge(_,Y),ge(_,Y)) :-
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Y is max(X,Y).
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c1(gt(_,X),ge(_,Y),gt(_,X)) :-
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X is max(X,Y).
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c1(ge(_,X),ge(_,Y),ge(_,Z)) :-
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Z is max(X,Y).
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c1(ge(_,X),gt(_,Y),ge(_,X)) :-
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X is max(X,Y).
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c1(ge(_,X),gt(_,Y),gt(_,Y)) :-
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Y is max(X,Y).
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c1(lt(_,X),lt(_,Y),lt(_,Z)) :-
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Z is min(X,Y).
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c1(lt(_,X),le(_,Y),le(_,Y)) :-
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Y is min(X,Y).
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c1(lt(_,X),le(_,Y),lt(_,X)) :-
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X is min(X,Y).
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c1(le(_,X),ge(_,Y),le(_,Z)) :-
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Z is min(X,Y).
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c1(le(_,X),lt(_,Y),le(_,X)) :-
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X is min(X,Y).
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c1(le(_,X),lt(_,Y),lt(_,Y)) :-
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Y is min(X,Y).
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/*range construct*/
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c1(gt(_,X),lt(_,Y),range(_,X,false,Y,false)).
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c1(gt(_,X),le(_,Y),range(_,X,false,Y,true)).
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c1(lt(_,Y),gt(_,X),range(_,X,false,Y,false)).
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c1(lt(_,Y),ge(_,X),range(_,X,true,Y,false)).
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c1(le(_,Y),gt(_,X),range(_,X,false,Y,true)).
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c1(le(_,Y),ge(_,X),range(_,X,true,Y,true)).
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c1(ge(_,X),lt(_,Y),range(_,X,true,Y,false)).
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c1(ge(_,X),le(_,Y),range(_,X,true,Y,true)).
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/*still needs to construct range +stuff*/
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