/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Rhino code, released
* May 6, 1999.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1997-1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Steve Yegge
*
* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License Version 2 or later (the "GPL"), in which
* case the provisions of the GPL are applicable instead of those above. If
* you wish to allow use of your version of this file only under the terms of
* the GPL and not to allow others to use your version of this file under the
* MPL, indicate your decision by deleting the provisions above and replacing
* them with the notice and other provisions required by the GPL. If you do
* not delete the provisions above, a recipient may use your version of this
* file under either the MPL or the GPL.
*
* ***** END LICENSE BLOCK ***** */
package org.mozilla.javascript.ast;
import org.mozilla.javascript.Token;
import java.util.ArrayList;
import java.util.List;
/**
* Switch-case AST node type. The switch case is always part of a
* switch statement.
* Node type is {@link Token#CASE}.<p>
*
* <pre><i>CaseBlock</i> :
* { [CaseClauses] }
* { [CaseClauses] DefaultClause [CaseClauses] }
* <i>CaseClauses</i> :
* CaseClause
* CaseClauses CaseClause
* <i>CaseClause</i> :
* <b>case</b> Expression : [StatementList]
* <i>DefaultClause</i> :
* <b>default</b> : [StatementList]</pre>
*/
public class SwitchCase extends AstNode {
private AstNode expression;
private List<AstNode> statements;
{
type = Token.CASE;
}
public SwitchCase() {
}
public SwitchCase(int pos) {
super(pos);
}
public SwitchCase(int pos, int len) {
super(pos, len);
}
/**
* Returns the case expression, {@code null} for default case
*/
public AstNode getExpression() {
return expression;
}
/**
* Sets the case expression, {@code null} for default case.
* Note that for empty fall-through cases, they still have
* a case expression. In {@code case 0: case 1: break;} the
* first case has an {@code expression} that is a
* {@link NumberLiteral} with value {@code 0}.
*/
public void setExpression(AstNode expression) {
this.expression = expression;
if (expression != null)
expression.setParent(this);
}
/**
* Return true if this is a default case.
* @return true if {@link #getExpression} would return {@code null}
*/
public boolean isDefault() {
return expression == null;
}
/**
* Returns statement list, which may be {@code null}.
*/
public List<AstNode> getStatements() {
return statements;
}
/**
* Sets statement list. May be {@code null}. Replaces any existing
* statements. Each element in the list has its parent set to this node.
*/
public void setStatements(List<AstNode> statements) {
if (this.statements != null) {
this.statements.clear();
}
for (AstNode s : statements) {
addStatement(s);
}
}
/**
* Adds a statement to the end of the statement list.
* Sets the parent of the new statement to this node, updates
* its start offset to be relative to this node, and sets the
* length of this node to include the new child.
*
* @param statement a child statement
* @throws IllegalArgumentException} if statement is {@code null}
*/
public void addStatement(AstNode statement) {
assertNotNull(statement);
if (statements == null) {
statements = new ArrayList<AstNode>();
}
int end = statement.getPosition() + statement.getLength();
this.setLength(end - this.getPosition());
statements.add(statement);
statement.setParent(this);
}
@Override
public String toSource(int depth) {
StringBuilder sb = new StringBuilder();
sb.append(makeIndent(depth));
if (expression == null) {
sb.append("default:\n");
} else {
sb.append("case ");
sb.append(expression.toSource(0));
sb.append(":\n");
}
if (statements != null) {
for (AstNode s : statements) {
sb.append(s.toSource(depth+1));
}
}
return sb.toString();
}
/**
* Visits this node, then the case expression if present, then
* each statement (if any are specified).
*/
@Override
public void visit(NodeVisitor v) {
if (v.visit(this)) {
if (expression != null) {
expression.visit(v);
}
if (statements != null) {
for (AstNode s : statements) {
s.visit(v);
}
}
}
}
}