/***** BEGIN LICENSE BLOCK *****
 * Version: CPL 1.0/GPL 2.0/LGPL 2.1
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 * The contents of this file are subject to the Common 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
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 *
 * 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) 2002 Jan Arne Petersen <jpetersen@uni-bonn.de>
 * Copyright (C) 2004 Thomas E Enebo <enebo@acm.org>
 * Copyright (C) 2004 Anders Bengtsson <ndrsbngtssn@yahoo.se>
 * 
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package org.jruby.parser;

import org.jruby.runtime.DynamicScope;

public class RubyParserConfiguration {
    private DynamicScope existingScope = null;
    private boolean asBlock = false;

    /**
     * If we are performing an eval we should pass existing scope in.
     * Calling this lets the parser know we need to do this.
     * 
     * @param existingScope is the scope that captures new vars, etc...
     */
    public void parseAsBlock(DynamicScope existingScope) {
        this.asBlock = true;
        this.existingScope = existingScope;
    }
    
    /**
     * This method returns the appropriate first scope for the parser.
     * 
     * @return correct top scope for source to be parsed
     */
    public DynamicScope getScope() {
        if (asBlock) {
            return existingScope;
        } 
        
        // FIXME: We should really not be creating the dynamic scope for the root
        // of the AST before parsing.  This makes us end up needing to readjust
        // this dynamic scope coming out of parse (and for local static scopes it
        // will always happen because of $~ and $_).
        return new DynamicScope(new LocalStaticScope(null), existingScope);
    }
}