An example: TermA=[1,test("_11","_12") :- +(1,"_11","_12")],TermB=[2,test("_11","_13") :- +(2,"_11","_13")],List=[TermA,TermB],constToVarRecList(List),List=[[1,test(1,A) :- _]|_] All occurances of _11 should be 1 and _12=A after this, but it isn't the unconverted version would be: TermA=[1,test(_11,_12) :- +(1,_11,_12)],TermB=[2,test(_11,_13) :- +(2,_11,_13)],List=[TermA,TermB],List=[[1,test(1,A) :- _]|_] and this works ofc. best regards Christian Wirth schrieb: > I'm trying to copy a nested term structure (a list and a tree). > When exporting the term structure, i replace all prolog-variables with > strings by term_string > When importing, those strings get replaces back with a variable and all > variables of the same string are getting unified ... but i have an error > somewhere in the program that prevents the variable unification. > Meaning that when variable A gets replaced by a constant, other > occurances of A are not getting replaced ? > I know the same variable name does not mean that it is the same > variable, but that should be done by string_to_var, because if the > string has already a replacement var, this var gets returned. > > Sourcecode (for the list version): > loadConvert(List,Tree) :- varToConstRecList(List). > saveConvert(List,Tree) :- init,constToVarRecList(List). > > > init :- > (current_predicate(logicStorage/2)->retractall(logicStorage(_,_));true),assertz(logicStorage(_,_):-false). > > % if string is seen, return variable (should unify all occurances of the > same string) > string_to_var(String,Var) :- logicStorage(String,Var),!. > string_to_var(String,Var) :- > term_string(Var,String),assert(logicStorage(String,Var)). > > varToConstRecList([]) :- !. > varToConstRecList([[Index,Head:-Body]|Rest]) :- > replace(Head),replace(Body),varToConstRecList(Rest). > > replace(F/A) :- !. %entry is only functor/arity > replace(Term) :- is_list(Term),(foreach(X,Term) do > (var(X)->true;replace(X))),!. %entry is a list > replace(Term) :- functor(Term,F,A),(for(I,1,A),param(Term) > do(arg(I,Term,Arg),getReplace(Arg,Replace),setarg(I,Term,Replace))). > %entry is a term > > getReplace(Var,Replace) :- var(Var),term_string(Var,Replace),!. %arg is > a var then replace > getReplace(Var,Replace) :- replace(Var),Replace=Var. %arg is no var then > try list and term > > > constToVarRecList([]) :- !. > constToVarRecList([[Index,Head:-Body]|Rest]) :- > replaceBack(Head),replaceBack(Body),constToVarRecList(Rest). > > replaceBack(Var) :- var(Var),!. > replaceBack(Term) :- is_list(Term),(foreach(X,Term) do > (var(X)->true;replaceBack(X))),!. > replaceBack(Term) :- functor(Term,F,A),(for(I,1,A),param(Term) > do(argreplace(Term,I))). > > argreplace(Term,I) :- > arg(I,Term,Arg),string(Arg),string_to_var(Arg,Replace),setarg(I,Term,Replace),!. > %argument is a string the replace > argreplace(Term,I) :- arg(I,Term,Arg),replaceBack(Arg). > > > > Wit Jakuczun schrieb: > >> W dniu 2010-06-24 16:28, Christian Wirth pisze: >> >> >>> As Info: >>> >>> I fixed the problem by converting all variables to strings before >>> exporting (term_string) >>> >>> >>> >> What do yo call variables? Are they Prolog variables? >> I would be grateful for some small example: what is this thing you are >> trying to copy? :) >> >> Best regards >> >> PS >> By the way: http://www.eclipse-clp.org/ - is not working... >> >> >> > > > ------------------------------------------------------------------------------ > ThinkGeek and WIRED's GeekDad team up for the Ultimate > GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the > lucky parental unit. See the prize list and enter to win: > http://p.sf.net/sfu/thinkgeek-promo > _______________________________________________ > ECLiPSe-CLP-Users mailing list > ECLiPSe-CLP-Users_at_lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/eclipse-clp-users > >Received on Thu Jun 24 2010 - 16:08:06 CEST
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