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Merge pull request #83 from pmoura/add_forall_2_predicate

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add de facto standard forall/2 predicate as a built-in predicate
This commit is contained in:
Mark Thom
2019-04-03 10:13:26 -03:00
committed by GitHub
parent 712d85129c 785d8d28e3
commit 9ad809680d
3 changed files with 13 additions and 2 deletions
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3
README.md
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@@ -44,7 +44,7 @@ Extend Scryer Prolog to include the following, among other features:
- [x] `call_residue_vars/2`
- [x] `if_` and related predicates, following the developments of the
paper "Indexing `dif/2`".
- [x] All-solutions predicates (`findall/{3,4}`, `bagof/3`, `setof/3`).
- [x] All-solutions predicates (`findall/{3,4}`, `bagof/3`, `setof/3`, `forall/2`).
- [x] Clause creation and destruction (`asserta/1`, `assertz/1`,
`retract/1`, `abolish/1`) with logical update semantics.
- [x] Backtrackable and non-backtrackable global variables via `bb_get/2`
@@ -182,6 +182,7 @@ The following predicates are built-in to Scryer.
* `false/0`
* `findall/{3,4}`
* `float/1`
* `forall/2`
* `freeze/2`
* `functor/3`
* `gen_int/1`

5
src/prolog/lib/builtins.pl
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@@ -10,7 +10,7 @@
bb_get/2, bb_put/2, call_cleanup/2,
call_with_inference_limit/3, catch/3, clause/2,
current_predicate/1, current_prolog_flag/2, expand_goal/2,
expand_term/2, findall/3, findall/4, halt/0, once/1, op/3,
expand_term/2, findall/3, findall/4, forall/2, halt/0, once/1, op/3,
repeat/0, retract/1, set_prolog_flag/2, setof/3,
setup_call_cleanup/3, term_variables/2, throw/1, true/0,
false/0, write/1, write_canonical/1, writeq/1, write_term/2]).
@@ -405,6 +405,9 @@ findall(Template, Goal, Solutions0, Solutions1) :-
Error,
( truncate_lh_to(LhLength), throw(Error) ))).
forall(Generate, Test) :-
\+ (Generate, \+ Test).
set_difference([X|Xs], [Y|Ys], Zs) :-
X == Y, !, set_difference(Xs, [Y|Ys], Zs).
set_difference([X|Xs], [Y|Ys], [X|Zs]) :-

7
src/tests.rs
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@@ -1802,6 +1802,13 @@ fn test_queries_on_builtins()
[["S = [_240, 1, 2]", "X = _0", "Y = _5"]]);
assert_prolog_success!(&mut wam, "?- setof(X, (exists(U,V) ^ member(X, [V,U,f(U),f(V)])), [a,b,f(b),f(a)]).");
assert_prolog_failure!(&mut wam, "?- forall(true, fail).");
assert_prolog_success!(&mut wam, "?- forall(fail, true)");
assert_prolog_success!(&mut wam, "?- catch(forall(_, true), error(instantiation_error, _), true).");
assert_prolog_success!(&mut wam, "?- catch(forall(true, _), error(instantiation_error, _), true).");
assert_prolog_success!(&mut wam, "?- catch(forall(1, true), error(type_error(callable, 1), _), true).");
assert_prolog_success!(&mut wam, "?- catch(forall(true, 1), error(type_error(callable, 1), _), true).");
submit(&mut wam, "
:- dynamic(cat/0).
cat.