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/***** BEGIN LICENSE BLOCK *****
 * Version: EPL 1.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * License Version 1.0 (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.eclipse.org/legal/epl-v10.html
 *
 * 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.
 *
 * Copyright (C) 2008 Thomas E Enebo 
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the EPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the EPL, the GPL or the LGPL.
 ***** END LICENSE BLOCK *****/
package org.jruby.ast;

import java.util.List;

import org.jruby.Ruby;
import org.jruby.RubyArray;
import org.jruby.ast.util.ArgsUtil;
import org.jruby.ast.visitor.NodeVisitor;
import org.jruby.evaluator.AssignmentVisitor;
import org.jruby.lexer.yacc.ISourcePosition;
import org.jruby.runtime.Arity;
import org.jruby.runtime.Block;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;

/**
 *
 */
public class MultipleAsgn19Node extends AssignableNode {
    private final ListNode pre;
    private final Node rest;
    private final ListNode post;
    private final Arity arity;

    public MultipleAsgn19Node(ISourcePosition position, ListNode pre, Node rest, ListNode post) {
        super(position);
        this.pre = pre;
        this.rest = rest;
        this.post = post;

        if (getRest() != null) {
            arity = Arity.required(getPreCount() + getPostCount());
        } else {
            arity = Arity.fixed(getPreCount() + getPostCount());
        }
    }

    public NodeType getNodeType() {
        return NodeType.MULTIPLEASGN19NODE;
    }

    public Object accept(NodeVisitor iVisitor) {
        return iVisitor.visitMultipleAsgnNode(this);
    }

    public Node getRest() {
        return rest;
    }

    public ListNode getPre() {
        return pre;
    }

    public int getPreCount() {
        return pre == null ? 0 : pre.size();
    }

    public int getPostCount() {
        return post == null ? 0 : post.size();
    }

    public ListNode getPost() {
        return post;
    }

    @Override
    public Arity getArity() {
        return arity;
    }

    public List childNodes() {
        return Node.createList(pre, rest, getValueNode());
    }

    @Override
    public IRubyObject interpret(Ruby runtime, ThreadContext context, IRubyObject self, Block aBlock) {
        IRubyObject value = getValueNode().interpret(runtime, context, self, aBlock);
        
        if (!(value instanceof RubyArray)) {
            value = ArgsUtil.convertToRubyArray19(runtime, value, pre != null);
        }

        return AssignmentVisitor.multiAssign(runtime, context, self, this, (RubyArray) value);
    }

    @Override
    public IRubyObject assign(Ruby runtime, ThreadContext context, IRubyObject self, IRubyObject value, Block block, boolean checkArity) {
        if (!(value instanceof RubyArray)) {
            value = ArgsUtil.convertToRubyArray19(runtime, value, pre != null);
        }

        return AssignmentVisitor.multiAssign(runtime, context, self, this, (RubyArray) value, checkArity);
    }
}