1 /*
   2  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.nashorn.internal.ir;
  27 
  28 import java.util.Collections;
  29 import java.util.List;
  30 import jdk.nashorn.internal.codegen.types.Type;
  31 import jdk.nashorn.internal.ir.visitor.NodeVisitor;
  32 
  33 /**
  34  * Represents ES6 template string expression. Note that this Node class is used
  35  * only in "parse only" mode. In evaluation mode, Parser directly folds template
  36  * literal as string concatenation. Parser API uses this node to represent ES6
  37  * template literals "as is" rather than as a String concatenation.
  38  */
  39 public final class TemplateLiteral extends Expression {
  40     private static final long serialVersionUID = 1L;
  41     private final List<Expression> exprs;
  42 
  43     public TemplateLiteral(final List<Expression> exprs) {
  44         super(exprs.get(0).getToken(), exprs.get(exprs.size() - 1).finish);
  45         this.exprs = exprs;
  46     }
  47 
  48     @Override
  49     public Type getType() {
  50         return Type.STRING;
  51     }
  52 
  53     @Override
  54     public Node accept(final NodeVisitor<? extends LexicalContext> visitor) {
  55         if (visitor.enterTemplateLiteral(this)) {
  56             return visitor.leaveTemplateLiteral(this);
  57         }
  58 
  59         return this;
  60     }
  61 
  62     @Override
  63     public void toString(final StringBuilder sb, final boolean printType) {
  64         for (final Expression expr : exprs) {
  65             sb.append(expr);
  66         }
  67     }
  68 
  69     /**
  70      * The list of expressions that are part of this template literal.
  71      *
  72      * @return the list of expressions that are part of this template literal.
  73      */
  74     public List<Expression> getExpressions() {
  75         return Collections.unmodifiableList(exprs);
  76     }
  77 }