Sets of variables in terms
Author(s): The CLIP Group.
This module implements predicates to handle sets of variables in terms.
Usage and interface
- Library usage:
:- use_module(library(terms_vars)). - Exports:
- Predicates:
varset/2, intersect_vars/3, member_var/2, diff_vars/3, varsbag/3, varset_in_args/2, term_variables/2, term_variables/3.
- Predicates:
- Imports:
Documentation on exports
PREDICATE
varsbag(Term,Vs,Xs)
Vs is the list of all the variables in Term ordered as they appear in Term right-to-left depth-first (including duplicates) plus Xs.
PREDICATE
Usage:varset_in_args(T,LL)
Each list of LL contains the variables of an argument of T, for each argument, and in left to right order.
- The following properties should hold at call time:
(term_typing:nonvar/1)T is currently a term which is not a free variable. - The following properties should hold upon exit:
(basic_props:list/2)LL is a list of list(var)s.
PREDICATE
Usage:ISOterm_variables(Term,Vars)
Vars is the list of all the variables in Term, ordered as they appear in Term right-to-left depth-first (without duplicates).
PREDICATE
term_variables(Term,Vars,Tail)
Vars-Tail is the difference list of all the variables in Term, ordered as they appear in Term right-to-left depth-first (without duplicates).
