/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source 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, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
* Free SoftwareFoundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.es.parser;
import com.caucho.es.ESException;
import com.caucho.es.ESId;
import java.io.IOException;
/**
* Expr is an intermediate form representing an expression.
*/
class DeleteExpr extends Expr {
private Expr lhs;
private IdExpr var;
private ESId id;
private Expr field;
private boolean isTop;
DeleteExpr(Block block, IdExpr var)
{
super(block);
this.var = var;
var.setUsed();
}
DeleteExpr(Block block, Expr lhs, ESId id)
{
super(block);
this.lhs = lhs;
this.id = id;
if (lhs != null)
lhs.setUsed();
}
DeleteExpr(Block block, Expr lhs, Expr field)
{
super(block);
this.lhs = lhs;
this.field = field;
if (lhs != null)
lhs.setUsed();
if (field != null)
field.setUsed();
}
void exprStatement(Function fun) throws ESException
{
isTop = true;
fun.addExpr(this);
}
/**
* The assignment operator
*/
void print()
throws IOException
{
if (var != null && var.isLocal()) {
if (! isTop)
cl.print("ESBoolean.FALSE");
}
else if (var != null) {
if (function.isGlobalScope())
cl.print("_env.global.delete(");
else
cl.print("_env.deleteScopeProperty(");
printLiteral(var.getId());
cl.print(")");
if (isTop)
cl.println(";");
}
else if (id != null) {
lhs.print();
cl.print(".delete(");
printLiteral(id);
cl.print(")");
if (isTop)
cl.println(";");
} else {
lhs.print();
cl.print(".delete(");
field.printStr();
cl.print(")");
if (isTop)
cl.println(";");
}
}
}