rishi/scryer-prolog
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add term comparison operators.

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This commit is contained in:
Mark Thom
2018-02-13 23:34:44 -07:00
parent a1fb4f529b
commit ae323a0cdf
9 changed files with 341 additions and 21 deletions
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9
src/prolog/iterators.rs
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@@ -72,6 +72,10 @@ impl<'a> QueryIterator<'a> {
let state = TermIterState::Clause(0, ClauseType::CompareNumber(qt), terms);
QueryIterator { state_stack: vec![state] }
},
&QueryTerm::CompareTerm(qt, ref terms) => {
let state = TermIterState::Clause(0, ClauseType::CompareTerm(qt), terms);
QueryIterator { state_stack: vec![state] }
},
&QueryTerm::Is(ref terms) => {
let state = TermIterState::Clause(0, ClauseType::Is, terms);
QueryIterator { state_stack: vec![state] }
@@ -302,6 +306,11 @@ impl<'a> ChunkedIterator<'a>
arity = vars.len();
break;
},
&QueryTerm::CompareTerm(..) => {
result.push(term);
arity = 2;
break;
},
&QueryTerm::Term(ref inner_term) =>
if let GenContext::Head = self.term_loc {
result.push(term);