/*
* 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 java.io.IOException;
/**
* FieldExpr is an intermediate form representing a field reference.
*
* <p>In JavaScript, foo.bar and foo["bar"] are equivalent.
*/
class FieldExpr extends Expr {
Expr lhs;
Expr field;
FieldExpr(Block block, Expr lhs, Expr field)
{
super(block);
this.lhs = lhs;
this.field = field;
if (lhs != null)
lhs.setUsed();
if (field != null)
field.setUsed();
}
/**
* Returns the base expression of the field. For foo.bar it returns foo.
*/
Expr getExpr()
{
return lhs;
}
/**
* Returns the field reference.
*/
Expr getField()
{
return field;
}
/**
* Type is always ES.
*/
int getType()
{
return TYPE_ES;
}
Expr assign(Expr value)
throws ESException
{
return new AssignExpr(block, lhs, field, value);
}
Expr delete()
{
return new DeleteExpr(block, lhs, field);
}
Expr prefix(int op)
{
if (op == '+')
return new PostfixExpr(block, PostfixExpr.PREINC, this);
else
return new PostfixExpr(block, PostfixExpr.PREDEC, this);
}
Expr postfix(int op)
{
if (op == '+')
return new PostfixExpr(block, PostfixExpr.POSTINC, this);
else
return new PostfixExpr(block, PostfixExpr.POSTDEC, this);
}
CallExpr startCall()
throws ESException
{
return new CallExpr(block, lhs, field, false);
}
CallExpr startNew()
throws ESException
{
return new CallExpr(block, lhs, field, true);
}
void printImpl() throws IOException
{
lhs.print();
cl.print(".getProperty(");
field.printStr();
cl.print(")");
}
}