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/*
* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package jdk.nashorn.internal.ir;
import java.util.List;
import jdk.nashorn.internal.ir.visitor.NodeVisitor;
/**
* Represents a block used as a statement.
*/
public class BlockStatement extends Statement {
private static final long serialVersionUID = 1L;
/** Block to execute. */
private final Block block;
/**
* Constructor
*
* @param block the block to execute
*/
public BlockStatement(final Block block) {
this(block.getFirstStatementLineNumber(), block);
}
/**
* Constructor
*
* @param lineNumber line number
* @param block the block to execute
*/
public BlockStatement(final int lineNumber, final Block block) {
super(lineNumber, block.getToken(), block.getFinish());
this.block = block;
}
private BlockStatement(final BlockStatement blockStatement, final Block block) {
super(blockStatement);
this.block = block;
}
/**
* Use this method to create a block statement meant to replace a single statement.
* @param stmt the statement to replace
* @param newStmts the statements for the new block statement
* @return a block statement with the new statements. It will have the line number, token, and finish of the
* original statement.
*/
public static BlockStatement createReplacement(final Statement stmt, final List<Statement> newStmts) {
return createReplacement(stmt, stmt.getFinish(), newStmts);
}
/**
* Use this method to create a block statement meant to replace a single statement.
* @param stmt the statement to replace
* @param finish the new finish for the block
* @param newStmts the statements for the new block statement
* @return a block statement with the new statements. It will have the line number, and token of the
* original statement.
*/
public static BlockStatement createReplacement(final Statement stmt, final int finish, final List<Statement> newStmts) {
return new BlockStatement(stmt.getLineNumber(), new Block(stmt.getToken(), finish, newStmts));
}
@Override
public boolean isTerminal() {
return block.isTerminal();
}
@Override
public Node accept(final NodeVisitor<? extends LexicalContext> visitor) {
if (visitor.enterBlockStatement(this)) {
return visitor.leaveBlockStatement(setBlock((Block)block.accept(visitor)));
}
return this;
}
@Override
public void toString(final StringBuilder sb, final boolean printType) {
block.toString(sb, printType);
}
/**
* Return the block to be executed
* @return the block
*/
public Block getBlock() {
return block;
}
/**
* Reset the block to be executed
* @param block the block
* @return new or same execute node
*/
public BlockStatement setBlock(final Block block) {
if (this.block == block) {
return this;
}
return new BlockStatement(this, block);
}
}
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