/*

  * Copyright (C) 2012 David Anderson

  *

  * This file is part of JITCraft.

  *

  * JITCraft is free software: you can redistribute it and/or modify it under

  * the terms of the GNU General Public License as published by the Free

  * Software Foundation, either version 3 of the License, or (at your option)

  * any later version.

  * 

  * Foobar is distributed in the hope that it will be useful, but WITHOUT ANY

  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

  * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License along with

  * JITCraft. If not, see http://www.gnu.org/licenses/.

  */

 #ifndef _include_jitcraft_scopes_h_

 #define _include_jitcraft_scopes_h_

 #include "../PoolAllocator.h"

 #include "../Structures.h"

 #include "AST.h"

 #include "NameBinding.h"

 namespace ke {

 class CompileContext;

 class EnvironmentMap;

 class Struct;

 class Scope : public PoolObject

 {

   protected:

     PoolAllocator &pool_;

     PoolList<Symbol *> names_;

     PoolList<Scope *> children_;

     bool empty() const {

         return names_.length() == 0;

     }

     void unlink();

   public:

     enum Kind {

         IMPORT,

         GLOBAL,

         FUNCTION,

         BLOCK

     };

   public:

     Scope(PoolAllocator &pool, Kind kind, Scope *enclosing);

     bool initialize();

     Kind kind() const {

         return kind_;

     }

     Scope *enclosing() const {

         return enclosing_;

     }

     bool addSymbol(Symbol *symbol);

     Scope *unlinkIfEmpty();

     Symbol *localLookup(Handle<String> name);

     Symbol *lookup(Handle<String> name);

     EnvironmentMap *createEnvironmentMap(Zone *zone);

     void setParent(Scope *parent) {

         assert(!enclosing_ || enclosing_ == parent);

         enclosing_ = parent;

     }

   private:

     Kind kind_;

     Scope *enclosing_;

 };

 class ArgumentScope : public Scope

 {

   public:

     static ArgumentScope *New(PoolAllocator &pool);

   private:

     ArgumentScope(PoolAllocator &pool);

 };

 class LocalScope : public Scope

 {

   public:

     static LocalScope *New(PoolAllocator &pool);

   private:

     LocalScope(PoolAllocator &pool);

 };

 class GlobalScope : public Scope

 {

   public:

     static GlobalScope *New(PoolAllocator &pool, ImportScope *parent);

     bool addPublic(Symbol *symbol);

     Symbol *findPublic(Handle<String> name);

     Struct *build(Zone *zone);

   private:

     GlobalScope(PoolAllocator &pool, ImportScope *parent);

   private:

     PoolList<Symbol *> publics_;

 };

 class ImportScope : public Scope

 {

   public:

     static ImportScope *New(PoolAllocator &pool);

   private:

     ImportScope(PoolAllocator &pool);

 };

 }

 #endif // _include_jitcraft_scopes_h_