// file      : build/scope -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Tools CC
// license   : MIT; see accompanying LICENSE file

#ifndef BUILD_SCOPE
#define BUILD_SCOPE

#include <build/path>
#include <build/path-map>
#include <build/variable>
#include <build/prerequisite>

namespace build
{
  class scope
  {
  public:
    typedef build::path path_type;

    const path_type&
    path () const {return i_->first;} // Absolute and normalized.

    scope*
    parent () const {return parent_;}

    // Variable lookup.
    //
  public:
    value_proxy
    operator[] (const std::string&);

    value_proxy
    operator[] (const variable&);

  private:
    friend class scope_map;

    typedef path_map<scope>::const_iterator iterator;

    scope (): variables (*this) {}

    void
    init (const iterator& i, scope* p) {i_ = i; parent_ = p;}

    void
    parent (scope& p) {parent_ = &p;}

  public:
    variable_map variables;
    prerequisite_set prerequisites;

  private:
    iterator i_;
    scope* parent_;
  };

  class scope_map: public path_map<scope>
  {
  public:
    // Note that we assume the first insertion into the map is that
    // of the root scope.
    //

    scope&
    operator[] (const path&);

    // Find the most qualified scope that encompasses this path.
    //
    scope&
    find (const path&);

  private:
    typedef path_map<scope> base;
  };

  extern scope_map scopes;
  extern scope* root_scope;
}

#endif // BUILD_SCOPE