| // Copyright (c) 2011, 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. |
| |
| package com.google.dart.compiler.ast; |
| |
| import com.google.common.base.Preconditions; |
| |
| import java.util.List; |
| |
| /** |
| * Represents a Dart string interpolation of the form: "1 ${a} 2 ${b} 3". |
| */ |
| public class DartStringInterpolation extends DartLiteral { |
| |
| /** |
| * Literal string portions. The interpolation alternates between strings and |
| * expressions. We preserve the invariant that {@code string.size() = |
| * expressions.size() + 1}. Empty string constants are used to represent |
| * adjacent expressions (e.g. $"${a} ${b}${c}" is represented by 4 strings |
| * ("", " ", "", "") and 3 expressions (#(){a}, #(){b}, #(){c}). |
| */ |
| private final NodeList<DartStringLiteral> strings = NodeList.create(this);; |
| |
| /** Embedded expressions (see {@link strings} for details). */ |
| private final NodeList<DartExpression> expressions = NodeList.create(this); |
| |
| public DartStringInterpolation(List<DartStringLiteral> strings, |
| List<DartExpression> expressions) { |
| Preconditions.checkNotNull(strings); |
| Preconditions.checkNotNull(expressions); |
| Preconditions.checkArgument(strings.size() == expressions.size() + 1); |
| this.strings.addAll(strings); |
| this.expressions.addAll(expressions); |
| } |
| |
| public List<DartStringLiteral> getStrings() { |
| return strings; |
| } |
| |
| public List<DartExpression> getExpressions() { |
| return expressions; |
| } |
| |
| @Override |
| public void visitChildren(ASTVisitor<?> visitor) { |
| strings.accept(visitor); |
| expressions.accept(visitor); |
| } |
| |
| @Override |
| public <R> R accept(ASTVisitor<R> visitor) { |
| return visitor.visitStringInterpolation(this); |
| } |
| } |