57 lines
2.1 KiB
Rust
57 lines
2.1 KiB
Rust
// Copyright 2016 Mozilla
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
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// this file except in compliance with the License. You may obtain a copy of the
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// License at http://www.apache.org/licenses/LICENSE-2.0
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// Unless required by applicable law or agreed to in writing, software distributed
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// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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// CONDITIONS OF ANY KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations under the License.
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extern crate mentat_query_parser;
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extern crate mentat_query;
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extern crate edn;
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use edn::PlainSymbol;
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use mentat_query::{
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Element,
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FindSpec,
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FnArg,
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Pattern,
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PatternNonValuePlace,
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PatternValuePlace,
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Predicate,
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Variable,
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WhereClause,
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};
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use mentat_query_parser::parse_find_string;
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///! N.B., parsing a query can be done without reference to a DB.
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///! Processing the parsed query into something we can work with
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///! for planning involves interrogating the schema and idents in
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///! the store.
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///! See <https://github.com/mozilla/mentat/wiki/Querying> for more.
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#[test]
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fn can_parse_predicates() {
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let s = "[:find [?x ...] :where [?x _ ?y] [(< ?y 10)]]";
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let p = parse_find_string(s).unwrap();
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assert_eq!(p.find_spec,
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FindSpec::FindColl(Element::Variable(Variable(PlainSymbol::new("?x")))));
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assert_eq!(p.where_clauses,
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vec![
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WhereClause::Pattern(Pattern {
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source: None,
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entity: PatternNonValuePlace::Variable(Variable(PlainSymbol::new("?x"))),
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attribute: PatternNonValuePlace::Placeholder,
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value: PatternValuePlace::Variable(Variable(PlainSymbol::new("?y"))),
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tx: PatternNonValuePlace::Placeholder,
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}),
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WhereClause::Pred(Predicate { operator: PlainSymbol::new("<"), args: vec![
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FnArg::Variable(Variable(PlainSymbol::new("?y"))), FnArg::EntidOrInteger(10),
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]}),
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]);
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}
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