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/***** 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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 * Copyright (C) 2007 Thomas E Enebo 
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package org.jruby.runtime;

import org.jruby.RubyModule;
import org.jruby.ast.IterNode;
import org.jruby.runtime.builtin.IRubyObject;

/**
 * Represents the live state of a for or END construct in Ruby.  This is different from an
 * ordinary block in that it does not have its own scoped variables.  It leeches those from
 * the next outer scope.  Because of this we do not set up, clone, nor tear down scope-related
 * stuff.  Also because of this we do not need to clone the block since it state does not change.
 * 
 */
public class SharedScopeBlock extends InterpretedBlock {
    protected SharedScopeBlock(IterNode iterNode) {
        super(iterNode, asArgumentType(getArgumentTypeWackyHack(iterNode)));
    }
    
    public static Block newInterpretedSharedScopeClosure(ThreadContext context, IterNode iterNode, DynamicScope dynamicScope, IRubyObject self) {
        Binding binding = context.currentBinding(self, dynamicScope);
        InterpretedBlock body = new SharedScopeBlock(iterNode);

        return new Block(body, binding);
    }
    
    @Override
    protected Frame pre(ThreadContext context, RubyModule klass, Binding binding) {
        return context.preForBlock(binding, klass);
    }
    
    public IRubyObject call(ThreadContext context, IRubyObject[] args, IRubyObject replacementSelf, Binding binding, Block.Type type) {
        return yield(context, context.runtime.newArrayNoCopy(args), null, null, true, binding, type);
    }
    
    @Override
    public Block cloneBlock(Binding binding) {
        return new Block(this, binding);
    }
}