blob: 8c15254d031493798dbce4fd9fc85028370ebc7a [file] [log] [blame]
// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
import '../boolean_selector.dart';
import 'union_selector.dart';
/// A selector that matches inputs that both of its sub-selectors match.
class IntersectionSelector implements BooleanSelector {
final BooleanSelector _selector1;
final BooleanSelector _selector2;
Iterable<String> get variables sync* {
yield* _selector1.variables;
yield* _selector2.variables;
IntersectionSelector(this._selector1, this._selector2);
bool evaluate(semantics) =>
_selector1.evaluate(semantics) && _selector2.evaluate(semantics);
BooleanSelector intersection(BooleanSelector other) =>
new IntersectionSelector(this, other);
BooleanSelector union(BooleanSelector other) =>
new UnionSelector(this, other);
void validate(bool isDefined(String variable)) {
String toString() => "($_selector1) && ($_selector2)";
bool operator==(other) =>
other is IntersectionSelector &&
_selector1 == other._selector1 &&
_selector2 == other._selector2;
int get hashCode => _selector1.hashCode ^ _selector2.hashCode;