| // Copyright (c) 2013, 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. |
| |
| library eval_test; |
| |
| import 'dart:async'; |
| |
| // Import mirrors to cause all mirrors to be retained by dart2js. |
| // The tests reflect on LinkedHashMap.length and String.length. |
| import 'dart:mirrors'; |
| |
| import 'package:polymer_expressions/eval.dart'; |
| import 'package:polymer_expressions/filter.dart'; |
| import 'package:polymer_expressions/parser.dart'; |
| import 'package:unittest/unittest.dart'; |
| import 'package:observe/observe.dart'; |
| import 'package:observe/mirrors_used.dart'; // make test smaller. |
| |
| main() { |
| reflectClass(Object); // suppress unused import warning |
| |
| group('eval', () { |
| test('should return the model for an empty expression', () { |
| expectEval('', 'model', 'model'); |
| }); |
| |
| test('should handle the "this" keyword', () { |
| expectEval('this', 'model', 'model'); |
| expectEval('this.name', 'foo', new Foo(name: 'foo')); |
| expectEval('this["a"]', 'x', {'a': 'x'}); |
| }); |
| |
| test('should return a literal int', () { |
| expectEval('1', 1); |
| expectEval('+1', 1); |
| expectEval('-1', -1); |
| }); |
| |
| test('should return a literal double', () { |
| expectEval('1.2', 1.2); |
| expectEval('+1.2', 1.2); |
| expectEval('-1.2', -1.2); |
| }); |
| |
| test('should return a literal string', () { |
| expectEval('"hello"', "hello"); |
| expectEval("'hello'", "hello"); |
| }); |
| |
| test('should return a literal boolean', () { |
| expectEval('true', true); |
| expectEval('false', false); |
| }); |
| |
| test('should return a literal null', () { |
| expectEval('null', null); |
| }); |
| |
| test('should return a literal list', () { |
| expectEval('[1, 2, 3]', equals([1, 2, 3])); |
| }); |
| |
| test('should return a literal map', () { |
| expectEval('{"a": 1}', equals(new Map.from({'a': 1}))); |
| expectEval('{"a": 1}', containsPair('a', 1)); |
| }); |
| |
| test('should call methods on a literal map', () { |
| expectEval('{"a": 1}.length', 1); |
| }); |
| |
| test('should evaluate unary operators', () { |
| expectEval('+a', 2, null, {'a': 2}); |
| expectEval('-a', -2, null, {'a': 2}); |
| expectEval('!a', false, null, {'a': true}); |
| }); |
| |
| test('should evaluate binary operators', () { |
| expectEval('1 + 2', 3); |
| expectEval('2 - 1', 1); |
| expectEval('4 / 2', 2); |
| expectEval('2 * 3', 6); |
| expectEval('5 % 2', 1); |
| expectEval('5 % -2', 1); |
| expectEval('-5 % 2', 1); |
| |
| expectEval('1 == 1', true); |
| expectEval('1 == 2', false); |
| expectEval('1 == null', false); |
| expectEval('1 != 1', false); |
| expectEval('1 != 2', true); |
| expectEval('1 != null', true); |
| |
| var x = {}; |
| var y = {}; |
| expectEval('x === y', true, null, {'x': x, 'y': x}); |
| expectEval('x !== y', false, null, {'x': x, 'y': x}); |
| expectEval('x === y', false, null, {'x': x, 'y': y}); |
| expectEval('x !== y', true, null, {'x': x, 'y': y}); |
| |
| expectEval('1 > 1', false); |
| expectEval('1 > 2', false); |
| expectEval('2 > 1', true); |
| expectEval('1 >= 1', true); |
| expectEval('1 >= 2', false); |
| expectEval('2 >= 1', true); |
| expectEval('1 < 1', false); |
| expectEval('1 < 2', true); |
| expectEval('2 < 1', false); |
| expectEval('1 <= 1', true); |
| expectEval('1 <= 2', true); |
| expectEval('2 <= 1', false); |
| |
| expectEval('true || true', true); |
| expectEval('true || false', true); |
| expectEval('false || true', true); |
| expectEval('false || false', false); |
| |
| expectEval('true && true', true); |
| expectEval('true && false', false); |
| expectEval('false && true', false); |
| expectEval('false && false', false); |
| }); |
| |
| test('should evaulate ternary operators', () { |
| expectEval('true ? 1 : 2', 1); |
| expectEval('false ? 1 : 2', 2); |
| expectEval('true ? true ? 1 : 2 : 3', 1); |
| expectEval('true ? false ? 1 : 2 : 3', 2); |
| expectEval('false ? true ? 1 : 2 : 3', 3); |
| expectEval('false ? 1 : true ? 2 : 3', 2); |
| expectEval('false ? 1 : false ? 2 : 3', 3); |
| expectEval('null ? 1 : 2', 2); |
| // TODO(justinfagnani): re-enable and check for an EvalError when |
| // we implement the final bool conversion rules and this expression |
| // throws in both checked and unchecked mode |
| // expect(() => eval(parse('42 ? 1 : 2'), null), throws); |
| }); |
| |
| test('should invoke a method on the model', () { |
| var foo = new Foo(name: 'foo', age: 2); |
| expectEval('x()', foo.x(), foo); |
| expectEval('name', foo.name, foo); |
| }); |
| |
| test('should invoke chained methods', () { |
| var foo = new Foo(name: 'foo', age: 2); |
| expectEval('name.length', foo.name.length, foo); |
| expectEval('x().toString()', foo.x().toString(), foo); |
| expectEval('name.substring(2)', foo.name.substring(2), foo); |
| expectEval('a()()', 1, null, {'a': () => () => 1}); |
| }); |
| |
| test('should invoke a top-level function', () { |
| expectEval('x()', 42, null, {'x': () => 42}); |
| expectEval('x(5)', 5, null, {'x': (i) => i}); |
| expectEval('y(5, 10)', 50, null, {'y': (i, j) => i * j}); |
| }); |
| |
| test('should give precedence to top-level functions over methods', () { |
| var foo = new Foo(name: 'foo', age: 2); |
| expectEval('x()', 42, foo, {'x': () => 42}); |
| }); |
| |
| test('should invoke the [] operator', () { |
| var map = {'a': 1, 'b': 2}; |
| expectEval('map["a"]', 1, null, {'map': map}); |
| expectEval('map["a"] + map["b"]', 3, null, {'map': map}); |
| }); |
| |
| test('should call a filter', () { |
| var topLevel = { |
| 'a': 'foo', |
| 'uppercase': (s) => s.toUpperCase(), |
| }; |
| expectEval('a | uppercase', 'FOO', null, topLevel); |
| }); |
| |
| test('should call a transformer', () { |
| var topLevel = { |
| 'a': '42', |
| 'parseInt': parseInt, |
| 'add': add, |
| }; |
| expectEval('a | parseInt()', 42, null, topLevel); |
| expectEval('a | parseInt(8)', 34, null, topLevel); |
| expectEval('a | parseInt() | add(10)', 52, null, topLevel); |
| }); |
| |
| test('should filter a list', () { |
| expectEval('chars1 | filteredList', ['a', 'b'], new WordElement()); |
| }); |
| |
| test('should return null if the receiver of a method is null', () { |
| expectEval('a.b', null, null, {'a': null}); |
| expectEval('a.b()', null, null, {'a': null}); |
| }); |
| |
| test('should return null if null is invoked', () { |
| expectEval('a()', null, null, {'a': null}); |
| }); |
| |
| test('should return null if an operand is null', () { |
| expectEval('a + b', null, null, {'a': null, 'b': null}); |
| expectEval('+a', null, null, {'a': null}); |
| }); |
| |
| test('should treat null as false', () { |
| expectEval('!null', true); |
| expectEval('true && null', false); |
| expectEval('null || false', false); |
| |
| expectEval('!a', true, null, {'a': null}); |
| |
| expectEval('a && b', false, null, {'a': null, 'b': true}); |
| expectEval('a && b', false, null, {'a': true, 'b': null}); |
| expectEval('a && b', false, null, {'a': null, 'b': false}); |
| expectEval('a && b', false, null, {'a': false, 'b': null}); |
| expectEval('a && b', false, null, {'a': null, 'b': null}); |
| |
| expectEval('a || b', true, null, {'a': null, 'b': true}); |
| expectEval('a || b', true, null, {'a': true, 'b': null}); |
| expectEval('a || b', false, null, {'a': null, 'b': false}); |
| expectEval('a || b', false, null, {'a': false, 'b': null}); |
| expectEval('a || b', false, null, {'a': null, 'b': null}); |
| }); |
| |
| test('should not evaluate "in" expressions', () { |
| expect(() => eval(parse('item in items'), null), throws); |
| }); |
| |
| }); |
| |
| group('assign', () { |
| |
| test('should assign a single identifier', () { |
| var foo = new Foo(name: 'a'); |
| assign(parse('name'), 'b', new Scope(model: foo)); |
| expect(foo.name, 'b'); |
| }); |
| |
| test('should assign a sub-property', () { |
| var child = new Foo(name: 'child'); |
| var parent = new Foo(child: child); |
| assign(parse('child.name'), 'Joe', new Scope(model: parent)); |
| expect(parent.child.name, 'Joe'); |
| }); |
| |
| test('should assign an index', () { |
| var foo = new Foo(items: [1, 2, 3]); |
| assign(parse('items[0]'), 4, new Scope(model: foo)); |
| expect(foo.items[0], 4); |
| assign(parse('items[a]'), 5, new Scope(model: foo, variables: {'a': 0})); |
| expect(foo.items[0], 5); |
| }); |
| |
| test('should assign with a function call subexpression', () { |
| var child = new Foo(); |
| var foo = new Foo(items: [1, 2, 3], child: child); |
| assign(parse('getChild().name'), 'child', new Scope(model: foo)); |
| expect(child.name, 'child'); |
| }); |
| |
| test('should assign through transformers', () { |
| var foo = new Foo(name: '42', age: 32); |
| var globals = { |
| 'a': '42', |
| 'parseInt': parseInt, |
| 'add': add, |
| }; |
| var scope = new Scope(model: foo, variables: globals); |
| assign(parse('age | add(7)'), 29, scope); |
| expect(foo.age, 22); |
| assign(parse('name | parseInt() | add(10)'), 29, scope); |
| expect(foo.name, '19'); |
| }); |
| |
| test('should not throw on assignments to properties on null', () { |
| assign(parse('name'), 'b', new Scope(model: null)); |
| }); |
| |
| test('should throw on assignments to non-assignable expressions', () { |
| var foo = new Foo(name: 'a'); |
| var scope = new Scope(model: foo); |
| expect(() => assign(parse('name + 1'), 1, scope), |
| throwsA(new isInstanceOf<EvalException>())); |
| expect(() => assign(parse('toString()'), 1, scope), |
| throwsA(new isInstanceOf<EvalException>())); |
| expect(() => assign(parse('name | filter'), 1, scope), |
| throwsA(new isInstanceOf<EvalException>())); |
| }); |
| |
| test('should not throw on assignments to non-assignable expressions if ' |
| 'checkAssignability is false', () { |
| var foo = new Foo(name: 'a'); |
| var scope = new Scope(model: foo); |
| expect( |
| assign(parse('name + 1'), 1, scope, checkAssignability: false), |
| null); |
| expect( |
| assign(parse('toString()'), 1, scope, checkAssignability: false), |
| null); |
| expect( |
| assign(parse('name | filter'), 1, scope, checkAssignability: false), |
| null); |
| }); |
| |
| }); |
| |
| group('scope', () { |
| test('should return fields on the model', () { |
| var foo = new Foo(name: 'a', age: 1); |
| var scope = new Scope(model: foo); |
| expect(scope['name'], 'a'); |
| expect(scope['age'], 1); |
| }); |
| |
| test('should throw for undefined names', () { |
| var scope = new Scope(); |
| expect(() => scope['a'], throwsException); |
| }); |
| |
| test('should return variables', () { |
| var scope = new Scope(variables: {'a': 'A'}); |
| expect(scope['a'], 'A'); |
| }); |
| |
| test("should a field from the parent's model", () { |
| var parent = new Scope(variables: {'a': 'A', 'b': 'B'}); |
| var child = parent.childScope('a', 'a'); |
| expect(child['a'], 'a'); |
| expect(parent['a'], 'A'); |
| expect(child['b'], 'B'); |
| }); |
| |
| }); |
| |
| group('observe', () { |
| test('should observe an identifier', () { |
| var foo = new Foo(name: 'foo'); |
| return expectObserve('name', |
| model: foo, |
| beforeMatcher: 'foo', |
| mutate: () { |
| foo.name = 'fooz'; |
| }, |
| afterMatcher: 'fooz' |
| ); |
| }); |
| |
| test('should observe an invocation', () { |
| var foo = new Foo(name: 'foo'); |
| return expectObserve('foo.name', |
| variables: {'foo': foo}, |
| beforeMatcher: 'foo', |
| mutate: () { |
| foo.name = 'fooz'; |
| }, |
| afterMatcher: 'fooz' |
| ); |
| }); |
| |
| test('should observe map access', () { |
| var foo = toObservable({'one': 'one', 'two': 'two'}); |
| return expectObserve('foo["one"]', |
| variables: {'foo': foo}, |
| beforeMatcher: 'one', |
| mutate: () { |
| foo['one'] = '1'; |
| }, |
| afterMatcher: '1' |
| ); |
| }); |
| |
| }); |
| |
| } |
| |
| @reflectable |
| class Foo extends ChangeNotifier { |
| String _name; |
| String get name => _name; |
| void set name(String n) { |
| _name = notifyPropertyChange(#name, _name, n); |
| } |
| |
| int age; |
| Foo child; |
| List<int> items; |
| |
| Foo({name, this.age, this.child, this.items}) : _name = name; |
| |
| int x() => age * age; |
| |
| getChild() => child; |
| |
| filter(i) => i; |
| } |
| |
| @reflectable |
| class ListHolder { |
| List items; |
| ListHolder(this.items); |
| } |
| |
| parseInt([int radix = 10]) => new IntToString(radix: radix); |
| |
| class IntToString extends Transformer<int, String> { |
| final int radix; |
| IntToString({this.radix: 10}); |
| int forward(String s) => int.parse(s, radix: radix); |
| String reverse(int i) => '$i'; |
| } |
| |
| add(int i) => new Add(i); |
| |
| class Add extends Transformer<int, int> { |
| final int i; |
| Add(this.i); |
| int forward(int x) => x + i; |
| int reverse(int x) => x - i; |
| } |
| |
| Object evalString(String s, [Object model, Map vars]) => |
| eval(new Parser(s).parse(), new Scope(model: model, variables: vars)); |
| |
| expectEval(String s, dynamic matcher, [Object model, Map vars = const {}]) { |
| var expr = new Parser(s).parse(); |
| var scope = new Scope(model: model, variables: vars); |
| expect(eval(expr, scope), matcher, reason: s); |
| |
| var observer = observe(expr, scope); |
| new Updater(scope).visit(observer); |
| expect(observer.currentValue, matcher, reason: s); |
| } |
| |
| expectObserve(String s, { |
| Object model, |
| Map variables: const {}, |
| dynamic beforeMatcher, |
| mutate(), |
| dynamic afterMatcher}) { |
| |
| var scope = new Scope(model: model, variables: variables); |
| var observer = observe(new Parser(s).parse(), scope); |
| update(observer, scope); |
| expect(observer.currentValue, beforeMatcher); |
| var passed = false; |
| var future = observer.onUpdate.first.then((value) { |
| expect(value, afterMatcher); |
| expect(observer.currentValue, afterMatcher); |
| passed = true; |
| }); |
| mutate(); |
| // fail if we don't receive an update by the next event loop |
| return Future.wait([future, new Future(() { |
| expect(passed, true, reason: "Didn't receive a change notification on $s"); |
| })]); |
| } |
| |
| // Regression test from https://code.google.com/p/dart/issues/detail?id=13459 |
| class WordElement extends Observable { |
| @observable List chars1 = 'abcdefg'.split(''); |
| @reflectable List filteredList(List original) => [original[0], original[1]]; |
| } |
