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#include "sass.hpp" 
#include "ast.hpp" 
#include "environment.hpp" 
 
namespace Sass { 
 
  template <typename T> 
  Environment<T>::Environment(bool is_shadow) 
  : local_frame_(environment_map<std::string, T>()), 
    parent_(0), is_shadow_(false) 
  { } 
  template <typename T> 
  Environment<T>::Environment(Environment<T>* env, bool is_shadow) 
  : local_frame_(environment_map<std::string, T>()), 
    parent_(env), is_shadow_(is_shadow) 
  { } 
  template <typename T> 
  Environment<T>::Environment(Environment<T>& env, bool is_shadow) 
  : local_frame_(environment_map<std::string, T>()), 
    parent_(&env), is_shadow_(is_shadow) 
  { } 
 
  // link parent to create a stack 
  template <typename T> 
  void Environment<T>::link(Environment& env) { parent_ = &env; } 
  template <typename T> 
  void Environment<T>::link(Environment* env) { parent_ = env; } 
 
  // this is used to find the global frame 
  // which is the second last on the stack 
  template <typename T> 
  bool Environment<T>::is_lexical() const 
  { 
    return !! parent_ && parent_->parent_; 
  } 
 
  // only match the real root scope 
  // there is still a parent around 
  // not sure what it is actually use for 
  // I guess we store functions etc. there 
  template <typename T> 
  bool Environment<T>::is_global() const 
  { 
    return parent_ && ! parent_->parent_; 
  } 
 
  template <typename T> 
  environment_map<std::string, T>& Environment<T>::local_frame() { 
    return local_frame_; 
  } 
 
  template <typename T> 
  bool Environment<T>::has_local(const std::string& key) const 
  { return local_frame_.find(key) != local_frame_.end(); } 
 
  template <typename T> EnvResult 
  Environment<T>::find_local(const std::string& key) 
  { 
    auto end = local_frame_.end(); 
    auto it = local_frame_.find(key); 
    return EnvResult(it, it != end); 
  } 
 
  template <typename T> 
  T& Environment<T>::get_local(const std::string& key) 
  { return local_frame_[key]; } 
 
  template <typename T> 
  void Environment<T>::set_local(const std::string& key, const T& val) 
  { 
    local_frame_[key] = val; 
  } 
  template <typename T> 
  void Environment<T>::set_local(const std::string& key, T&& val) 
  { 
    local_frame_[key] = val; 
  } 
 
  template <typename T> 
  void Environment<T>::del_local(const std::string& key) 
  { local_frame_.erase(key); } 
 
  template <typename T> 
  Environment<T>* Environment<T>::global_env() 
  { 
    Environment* cur = this; 
    while (cur->is_lexical()) { 
      cur = cur->parent_; 
    } 
    return cur; 
  } 
 
  template <typename T> 
  bool Environment<T>::has_global(const std::string& key) 
  { return global_env()->has(key); } 
 
  template <typename T> 
  T& Environment<T>::get_global(const std::string& key) 
  { return (*global_env())[key]; } 
 
  template <typename T> 
  void Environment<T>::set_global(const std::string& key, const T& val) 
  { 
    global_env()->local_frame_[key] = val; 
  } 
  template <typename T> 
  void Environment<T>::set_global(const std::string& key, T&& val) 
  { 
    global_env()->local_frame_[key] = val; 
  } 
 
  template <typename T> 
  void Environment<T>::del_global(const std::string& key) 
  { global_env()->local_frame_.erase(key); } 
 
  template <typename T> 
  Environment<T>* Environment<T>::lexical_env(const std::string& key) 
  { 
    Environment* cur = this; 
    while (cur) { 
      if (cur->has_local(key)) { 
        return cur; 
      } 
      cur = cur->parent_; 
    } 
    return this; 
  } 
 
  // see if we have a lexical variable 
  // move down the stack but stop before we 
  // reach the global frame (is not included) 
  template <typename T> 
  bool Environment<T>::has_lexical(const std::string& key) const 
  { 
    auto cur = this; 
    while (cur->is_lexical()) { 
      if (cur->has_local(key)) return true; 
      cur = cur->parent_; 
    } 
    return false; 
  } 
 
  // see if we have a lexical we could update 
  // either update already existing lexical value 
  // or if flag is set, we create one if no lexical found 
  template <typename T> 
  void Environment<T>::set_lexical(const std::string& key, const T& val) 
  { 
    Environment<T>* cur = this; 
    bool shadow = false; 
    while ((cur && cur->is_lexical()) || shadow) { 
      EnvResult rv(cur->find_local(key)); 
      if (rv.found) { 
        rv.it->second = val; 
        return; 
      } 
      shadow = cur->is_shadow(); 
      cur = cur->parent_; 
    } 
    set_local(key, val); 
  } 
  // this one moves the value 
  template <typename T> 
  void Environment<T>::set_lexical(const std::string& key, T&& val) 
  { 
    Environment<T>* cur = this; 
    bool shadow = false; 
    while ((cur && cur->is_lexical()) || shadow) { 
      EnvResult rv(cur->find_local(key)); 
      if (rv.found) { 
        rv.it->second = val; 
        return; 
      } 
      shadow = cur->is_shadow(); 
      cur = cur->parent_; 
    } 
    set_local(key, val); 
  } 
 
  // look on the full stack for key 
  // include all scopes available 
  template <typename T> 
  bool Environment<T>::has(const std::string& key) const 
  { 
    auto cur = this; 
    while (cur) { 
      if (cur->has_local(key)) { 
        return true; 
      } 
      cur = cur->parent_; 
    } 
    return false; 
  } 
 
  // look on the full stack for key 
  // include all scopes available 
  template <typename T> EnvResult 
  Environment<T>::find(const std::string& key) 
  { 
    auto cur = this; 
    while (true) { 
      EnvResult rv(cur->find_local(key)); 
      if (rv.found) return rv; 
      cur = cur->parent_; 
      if (!cur) return rv; 
    } 
  }; 
 
  // use array access for getter and setter functions 
  template <typename T> 
  T& Environment<T>::operator[](const std::string& key) 
  { 
    auto cur = this; 
    while (cur) { 
      if (cur->has_local(key)) { 
        return cur->get_local(key); 
      } 
      cur = cur->parent_; 
    } 
    return get_local(key); 
  } 
/* 
  #ifdef DEBUG 
  template <typename T> 
  size_t Environment<T>::print(std::string prefix) 
  { 
    size_t indent = 0; 
    if (parent_) indent = parent_->print(prefix) + 1; 
    std::cerr << prefix << std::string(indent, ' ') << "== " << this << std::endl; 
    for (typename environment_map<std::string, T>::iterator i = local_frame_.begin(); i != local_frame_.end(); ++i) { 
      if (!ends_with(i->first, "[f]") && !ends_with(i->first, "[f]4") && !ends_with(i->first, "[f]2")) { 
        std::cerr << prefix << std::string(indent, ' ') << i->first << " " << i->second; 
        if (Value_Ptr val = Cast<Value>(i->second)) 
        { std::cerr << " : " << val->to_string(); } 
        std::cerr << std::endl; 
      } 
    } 
    return indent ; 
  } 
  #endif 
*/ 
  // compile implementation for AST_Node 
  template class Environment<AST_Node_Obj>; 
 
}