mirror of
https://github.com/dart-lang/sdk
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296099e66f
Bug: Change-Id: Ic8fd22a882887682f3c23a54515b72bb7a7ae13e Reviewed-on: https://dart-review.googlesource.com/12860 Commit-Queue: Phil Quitslund <pquitslund@google.com> Reviewed-by: Ben Konyi <bkonyi@google.com>
134 lines
3.3 KiB
Dart
134 lines
3.3 KiB
Dart
// Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import "package:expect/expect.dart";
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// library abstract_expressions;
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abstract class AbstractExpression {}
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abstract class AbstractAddition<E> {
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E operand1, operand2;
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AbstractAddition(this.operand1, this.operand2);
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}
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abstract class AbstractSubtraction<E> {
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E operand1, operand2;
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AbstractSubtraction(this.operand1, this.operand2);
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}
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abstract class AbstractNumber {
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int val;
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AbstractNumber(this.val);
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}
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// library evaluator;
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abstract class ExpressionWithEval {
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int get eval;
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}
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abstract class AdditionWithEval<E extends ExpressionWithEval> {
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E get operand1;
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E get operand2;
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int get eval => operand1.eval + operand2.eval;
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}
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abstract class SubtractionWithEval<E extends ExpressionWithEval> {
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E get operand1;
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E get operand2;
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int get eval => operand1.eval - operand2.eval;
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}
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abstract class NumberWithEval {
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int get val;
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int get eval => val;
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}
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// library multiplication;
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abstract class AbstractMultiplication<E> {
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E operand1, operand2;
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AbstractMultiplication(this.operand1, this.operand2);
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}
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// library multiplicationEvaluator;
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// import 'evaluator.dart' show ExpressionWithEval;
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abstract class MultiplicationWithEval<E extends ExpressionWithEval> {
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E get operand1;
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E get operand2;
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int get eval => operand1.eval * operand2.eval;
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}
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// library string_converter;
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abstract class ExpressionWithStringConversion {
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String toString();
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}
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abstract class AdditionWithStringConversion<
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E extends ExpressionWithStringConversion> {
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E get operand1;
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E get operand2;
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String toString() => '($operand1 + $operand2))';
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}
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abstract class SubtractionWithStringConversion<
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E extends ExpressionWithStringConversion> {
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E get operand1;
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E get operand2;
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String toString() => '($operand1 - $operand2)';
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}
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abstract class NumberWithStringConversion {
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int get val;
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String toString() => val.toString();
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}
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abstract class MultiplicationWithStringConversion<
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E extends ExpressionWithStringConversion> {
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E get operand1;
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E get operand2;
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String toString() => '($operand1 * $operand2)';
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}
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// library expressions;
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// import 'abstractExpressions.dart';
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// import 'evaluator.dart';
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// import 'multiplication.dart';
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// import 'multiplicationEvaluator.dart';
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// import 'stringConverter.dart';
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abstract class Expression = AbstractExpression
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with ExpressionWithEval, ExpressionWithStringConversion;
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class Addition = AbstractAddition<Expression>
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with AdditionWithEval<Expression>, AdditionWithStringConversion<Expression>
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implements Expression;
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class Subtraction = AbstractSubtraction<Expression>
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with
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SubtractionWithEval<Expression>,
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SubtractionWithStringConversion<Expression>
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implements Expression;
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class Number = AbstractNumber
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with NumberWithEval, NumberWithStringConversion
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implements Expression;
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class Multiplication = AbstractMultiplication<Expression>
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with
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MultiplicationWithEval<Expression>,
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MultiplicationWithStringConversion<Expression>
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implements Expression;
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void main() {
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Expression e = new Multiplication(new Addition(new Number(4), new Number(2)),
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new Subtraction(new Number(10), new Number(7)));
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Expect.equals('((4 + 2)) * (10 - 7)) = 18', '$e = ${e.eval}');
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}
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