/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package macromedia.asc.parser;
import macromedia.asc.util.*;
import macromedia.asc.semantics.*;
import static macromedia.asc.util.BitSet.*;
/**
* Node
*
* @author Jeff Dyer
*/
public class StatementListNode extends Node
{
public ObjectList<Node> items = new ObjectList<Node>(5);
public boolean dominates_program_endpoint;
public boolean was_empty;
public boolean is_loop;
public boolean is_block;
public boolean has_pragma;
public NumberUsage numberUsage; // use if is_block
public ObjectValue default_namespace;
public AttributeListNode config_attrs;
public StatementListNode(Node item)
{
dominates_program_endpoint = false;
was_empty = false;
is_loop = false;
is_block = false;
has_pragma = false;
numberUsage = null;
if( item != null )
{
items.add(item);
}
}
public Value evaluate(Context cx, Evaluator evaluator)
{
if (evaluator.checkFeature(cx, this))
{
return evaluator.evaluate(cx, this);
}
else
{
return null;
}
}
public Node first()
{
//StatementListNode* node = this;
//while(node->list!=NULL)
//{
// node = node->list;
//}
return items.isEmpty() ? null : items.first();
}
public int countVars()
{
int count = 0;
for (Node n : items)
{
if (n != null)
{
count += n.countVars();
}
}
return count;
}
public Node last()
{
return items.isEmpty() ? null : items.last();
}
public BitSet getGenBits()
{
BitSet genbits = null;
for (Node n : items)
{
genbits = reset_set(genbits, n.getKillBits(), n.getGenBits());
// ISSUE: this has changed, test!
}
return genbits;
}
public BitSet getKillBits()
{
BitSet killbits = null;
for (Node n : items)
{
killbits = reset_set(killbits, n.getGenBits(), n.getKillBits());
}
return killbits;
}
public boolean isStatementList()
{
return true;
}
public String toString()
{
if(Node.useDebugToStrings)
return "StatementListNode@" + pos();
else
return items.last().toString();
}
public boolean definesCV()
{
for (Node n : items)
{
if( n.isExpressionStatement() )
{
ExpressionStatementNode expr = (ExpressionStatementNode) n;
if( !expr.isVarStatement() )
{
return true;
}
}
}
return false;
}
public void voidResult()
{
for (Node n : items)
{
n.voidResult();
}
if( items.last() instanceof LoadRegisterNode )
{
// voidResult on LoadRegister does nothing, which is usually correct
// since it appears in the middle of statement lists, and its result is used by the other nodes in the StatementList
// but when it's the last item in the statement list, and the statement list should be a void result
// we really want the LoadRegisterNode to have a void result so it won't screw up the stack.
((LoadRegisterNode)items.last()).void_result = true;
}
}
}