/*
* $Id: PrefixDecrementNode.java,v 1.7 2002/09/16 08:05:05 jkl Exp $
*
* Copyright (c) 2002 Njet Communications Ltd. All Rights Reserved.
*
* Use is subject to license terms, as defined in
* Anvil Sofware License, Version 1.1. See LICENSE
* file, or http://njet.org/license-1.1.txt
*/
package anvil.script.expression;
import anvil.ErrorListener;
import anvil.Location;
import anvil.core.Any;
import anvil.codec.Code;
import anvil.codec.ConstantPool;
import anvil.script.compiler.ByteCompiler;
import anvil.script.Context;
import java.io.IOException;
/**
* class PrefixDecrementNode
*
* @author: Jani Lehtim�ki
*/
public class PrefixDecrementNode extends UnaryParent
{
protected Location _location;
public PrefixDecrementNode(Location location, Node child)
{
super(child);
_location = location;
}
public int typeOf()
{
return Node.EXPR_PREFIX_DECREMENT;
}
public boolean isConstant()
{
return false;
}
public void check(ErrorListener listener)
{
super.check(listener);
if (!_child.isUpdatable()) {
listener.error(_location, "Right side of '--' is not an updatable expression");
}
}
public void compile(ByteCompiler context, int operation)
{
Code code = context.getCode();
ConstantPool pool = code.getPool();
final Node child = _child;
switch(child.typeOf()) {
case Node.EXPR_VARIABLE:
{
child.compile(context, new Node() {
public void compile(ByteCompiler context, int operation)
{
Code code = context.getCode();
child.compile(context, GET);
code.invokevirtual(code.getPool().addMethodRef(context.TYPE_ANY, "decrease", "()Lanvil/core/Any;"));
}
});
}
break;
case Node.EXPR_ATTRIBUTE:
{
AttributeNode attr = (AttributeNode)child;
attr.getChild().compile(context, GET);
code.astring(attr.getAttribute());
code.aload_first();
code.invokestatic(pool.addMethodRef(context.TYPE_CONTEXT, "predec",
"(Lanvil/core/Any;Ljava/lang/String;Lanvil/script/Context;)Lanvil/core/Any;"));
}
break;
case Node.EXPR_REFERENCE:
{
ReferenceNode ref = (ReferenceNode)child;
ref.getLeft().compile(context, GET);
ref.getRight().compile(context, GET);
code.aload_first();
code.invokestatic(pool.addMethodRef(context.TYPE_CONTEXT, "predec",
"(Lanvil/core/Any;Lanvil/core/Any;Lanvil/script/Context;)Lanvil/core/Any;"));
}
break;
default:
child.compile(context, operation);
}
if (operation == GET_BOOLEAN) {
context.any2boolean();
}
}
}