Import.h

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/*---------------------------------------------------------*- c++ -*---\
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|                                          Copyright (C) SuSE Linux AG |
\----------------------------------------------------------------------/

   File:        Import.h

   Author:      Klaus Kaempf <kkaempf@suse.de>
   Maintainer:  Klaus Kaempf <kkaempf@suse.de>

/-*/
// -*- c++ -*-

#ifndef Import_h
#define Import_h

#include <string>
#include <stack>
using std::string;

#include "ycp/YCode.h"
#include "ycp/SymbolTable.h"
#include "ycp/YSymbolEntry.h"

class SymbolEntry;
class Y2Namespace;

class Import {
    // track tables of nested imports, no need to track their usage

    static int m_disable_tracking;
    static std::stack <std::pair <string, SymbolTable *> > m_table_stack;
public:
    static void disableTracking ();
    static void enableTracking ();

public:
    // module block pointer, pointer to constructor
    // map of name : module_entry
    typedef std::map<std::string, Y2Namespace *> module_map;


protected:
    static module_map m_active_modules;

    Ustring m_name;

    // iterator to share the module state on multiple imports
    module_map::iterator m_module;

public:
    Import ();

    // load module by name. If block != 0, it's already loaded
    //   name_space is non-const since it might get evaluated
    Import (const string &name, Y2Namespace *name_space = 0);
    ~Import ();

    int import (const string &name, Y2Namespace *preloaded_namespace = 0);              // delayed import, use in case default constructor was used

    string name () const;
    Y2Namespace *nameSpace () const;            // return NULL on failure
};

#endif   // Import_h

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