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.List; 29 import jdk.nashorn.internal.ir.visitor.NodeVisitor; 30 31 /** 32 * Represents a block used as a statement. 33 */ 34 public class BlockStatement extends Statement { 35 private static final long serialVersionUID = 1L; 36 37 /** Block to execute. */ 38 private final Block block; 39 40 /** 41 * Constructor 42 * 43 * @param block the block to execute 44 */ 45 public BlockStatement(final Block block) { 46 this(block.getFirstStatementLineNumber(), block); 47 } 48 49 /** 50 * Constructor 51 * 52 * @param lineNumber line number 53 * @param block the block to execute 54 */ 55 public BlockStatement(final int lineNumber, final Block block) { 56 super(lineNumber, block.getToken(), block.getFinish()); 57 this.block = block; 58 } 59 60 private BlockStatement(final BlockStatement blockStatement, final Block block) { 61 super(blockStatement); 62 this.block = block; 63 } 64 65 /** 66 * Use this method to create a block statement meant to replace a single statement. 67 * @param stmt the statement to replace 68 * @param newStmts the statements for the new block statement 69 * @return a block statement with the new statements. It will have the line number, token, and finish of the 70 * original statement. 71 */ 72 public static BlockStatement createReplacement(final Statement stmt, final List<Statement> newStmts) { 73 return createReplacement(stmt, stmt.getFinish(), newStmts); 74 } 75 76 /** 77 * Use this method to create a block statement meant to replace a single statement. 78 * @param stmt the statement to replace 79 * @param finish the new finish for the block 80 * @param newStmts the statements for the new block statement 81 * @return a block statement with the new statements. It will have the line number, and token of the 82 * original statement. 83 */ 84 public static BlockStatement createReplacement(final Statement stmt, final int finish, final List<Statement> newStmts) { 85 return new BlockStatement(stmt.getLineNumber(), new Block(stmt.getToken(), finish, newStmts)); 86 } 87 88 @Override 89 public boolean isTerminal() { 90 return block.isTerminal(); 91 } 92 93 /** 94 * Tells if this is a synthetic block statement or not. 95 * 96 * @return true if this is a synthetic statement 97 */ 98 public boolean isSynthetic() { 99 return block.isSynthetic(); 100 } 101 102 @Override 103 public Node accept(final NodeVisitor<? extends LexicalContext> visitor) { 104 if (visitor.enterBlockStatement(this)) { 105 return visitor.leaveBlockStatement(setBlock((Block)block.accept(visitor))); 106 } 107 108 return this; 109 } 110 111 @Override 112 public void toString(final StringBuilder sb, final boolean printType) { 113 block.toString(sb, printType); 114 } 115 116 /** 117 * Return the block to be executed 118 * @return the block 119 */ 120 public Block getBlock() { 121 return block; 122 } 123 124 /** 125 * Reset the block to be executed 126 * @param block the block 127 * @return new or same execute node 128 */ 129 public BlockStatement setBlock(final Block block) { 130 if (this.block == block) { 131 return this; 132 } 133 return new BlockStatement(this, block); 134 } 135 }