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minor fixes

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This commit is contained in:
Mark Thom
2019-04-17 21:31:00 -06:00
parent 465f2cc6e5
commit 2a69a74319
3 changed files with 30 additions and 22 deletions
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2
Cargo.toml
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@@ -1,6 +1,6 @@
[package]
name = "scryer-prolog"
version = "0.8.54"
version = "0.8.55"
authors = ["Mark Thom <markjordanthom@gmail.com>"]
repository = "https://github.com/mthom/scryer-prolog"
description = "A modern Prolog implementation written mostly in Rust."

48
src/prolog/lib/builtins.pl
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@@ -220,32 +220,28 @@ is_write_option(Functor) :-
Functor =.. [Name, Arg],
( Arg == true -> true
; Arg == false -> true
; throw(error(domain_error(write_option, Functor), write_term/2)) ), % 8.14.2.3 e)
; var(Arg) -> throw(error(instantiation_error, write_term/2))
; throw(error(domain_error(write_option, Functor), write_term/2))
), % 8.14.2.3 e)
( Name == ignore_ops -> true
; Name == quoted -> true
; Name == numbervars -> true
; throw(error(domain_error(write_option, Functor), write_term/2)) ). % 8.14.2.3 e)
; throw(error(domain_error(write_option, Functor), write_term/2))
). % 8.14.2.3 e)
inst_member_or([X|Xs], Y, _) :-
( nonvar(X), is_write_option(X) -> ( Y = X, ! ; inst_member_or(Xs, Y, _) )
; throw(instantiation_error) ). % 8.14.2.3 b)
( var(X) -> throw(error(instantiation_error, write_term/2))
; is_write_option(X) -> ( Y = X, ! ; inst_member_or(Xs, Y, _) )
; throw(error(domain_error(write_option, X), write_term/2))
).
inst_member_or([], Y, Y).
%% TODO: complete the predicate! Most read options are missing.
read_term(Term, Options) :-
write_term(_, Options) :-
var(Options), throw(error(instantiation_error, write_term/2)).
write_term(Term, Options) :-
'$skip_max_list'(_, -1, Options, Options0),
( Options0 == [] -> true
; var(Options0) -> throw(error(instantiation_error, read_term/2)) % 8.14.1.3 b)
; throw(error(type_error(list, Options), read_term/2)) % 8.14.1.3 d)
),
( Options = [variable_names(VarList)] -> '$read_term'(Term, VarList)
; Options = [] -> read(Term)
; false
).
write_term(Term, Options) :-
'$skip_max_list'(_, -1, Options, Options0),
( Options0 == [] -> true
( var(Options0) -> throw(error(instantiation_error, write_term/2))
; Options0 == [] -> true
; throw(error(type_error(list, Options), write_term/2))
), % 8.14.2.3 c)
inst_member_or(Options, ignore_ops(IgnoreOps), ignore_ops(false)),
@@ -259,6 +255,18 @@ write_canonical(Term) :- write_term(Term, [ignore_ops(true), quoted(true)]).
writeq(Term) :- write_term(Term, [quoted(true), numbervars(true)]).
%% TODO: complete the predicate! Most read options are missing.
read_term(Term, Options) :-
'$skip_max_list'(_, -1, Options, Options0),
( Options0 == [] -> true
; var(Options0) -> throw(error(instantiation_error, read_term/2)) % 8.14.1.3 b)
; throw(error(type_error(list, Options), read_term/2)) % 8.14.1.3 d)
),
( Options = [variable_names(VarList)] -> '$read_term'(Term, VarList)
; Options = [] -> read(Term)
; false
).
% expand_goal.
expand_goal(Term0, Term) :- '$expand_goal'(Term0, Term).
@@ -269,9 +277,9 @@ expand_term(Term0, Term) :- '$expand_term'(Term0, Term).
% term_variables.
% ensures List is either a variable or a proper list.
% ensures List is either a variable or a list.
can_be_list(List, _) :- var(List), !.
can_be_list(List, _) :- '$skip_max_list'(_, -1, List, Tail), Tail == [], !.
can_be_list(List, _) :- '$skip_max_list'(_, -1, List, Tail), ( var(Tail) -> true ; Tail == []), !.
can_be_list(List, PI) :- throw(error(type_error(list, List), PI)).
term_variables(Term, Vars) :-

2
src/prolog/macros.rs
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@@ -183,7 +183,7 @@ macro_rules! return_from_clause {
}
if $lco {
$machine_st.p = CodePtr::Local($machine_st.cp.clone());
$machine_st.p = CodePtr::Local($machine_st.cp);
} else {
$machine_st.p += 1;
}