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32 lines
853 B
Dart
32 lines
853 B
Dart
// Copyright 2016 Google Inc. Use of this source code is governed by an
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// MIT-style license that can be found in the LICENSE file or at
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// https://opensource.org/licenses/MIT.
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import 'value/boolean.dart';
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import 'value/identifier.dart';
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import 'visitor/value.dart';
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export 'value/boolean.dart';
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export 'value/identifier.dart';
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export 'value/list.dart';
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export 'value/number.dart';
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export 'value/string.dart';
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abstract class Value {
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/// Whether the value will be represented in CSS as the empty string.
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bool get isBlank => false;
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const Value();
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/*=T*/ accept/*<T>*/(ValueVisitor/*<T>*/ visitor);
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// TODO: call the proper stringifying method
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Value unaryPlus() => new Identifier("+$this");
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Value unaryMinus() => new Identifier("-$this");
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Value unaryDivide() => new Identifier("/$this");
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Value unaryNot() => Boolean.sassFalse;
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}
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