Compiler_Module_Semantic_Environment.H

/*
                          Aleph_w

  Data structures & Algorithms
  version 2.0.0b
  https://github.com/lrleon/Aleph-w

  This file is part of Aleph-w library

  Copyright (c) 2002-2026 Leandro Rabindranath Leon

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  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
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  copies of the Software, and to permit persons to whom the Software is
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*/

/** @file Compiler_Module_Semantic_Environment.H
 *  @brief Reusable namespace-separated semantic environment for modules.
 *
 *  This header derives one semantic environment per module from
 *  `Compiler_Module_Name_Table.H`. Each environment exposes separate value and
 *  type namespaces so frontends can consume imported symbols without rebuilding
 *  that split from raw bindings on every run.
 *
 *  @ingroup Utilities
 */

#ifndef COMPILER_MODULE_SEMANTIC_ENVIRONMENT_H
#define COMPILER_MODULE_SEMANTIC_ENVIRONMENT_H

#include <sstream>
#include <string>
#include <string_view>

#include <Compiler_Module_Name_Table.H>

namespace Aleph {
/** @brief One namespace-separated semantic environment for a module. */
struct Compiler_Module_Semantic_Module
{
  std::string module_name;
  size_t module_index = static_cast<size_t>(-1);
  size_t order_index = static_cast<size_t>(-1);
  DynArray<Compiler_Module_Bound_Name> values;
  DynArray<Compiler_Module_Bound_Name> types;
  DynArray<std::string> ambiguous_values;
  DynArray<std::string> ambiguous_types;
};

/** @brief Semantic environments for all modules in one compilation unit set. */
struct Compiler_Module_Semantic_Environment
{
  DynArray<Compiler_Module_Semantic_Module> modules;
};

namespace Compiler_Module_Semantic_Environment_Detail {
inline void append_unique_name(DynArray<std::string> &names, const std::string &name)
{
  for (size_t i = 0; i < names.size(); ++i)
    if (names.access(i) == name)
      return;
  names.append(name);
}
}  // namespace Compiler_Module_Semantic_Environment_Detail

/** @brief Builds one namespace-separated semantic environment from a name table.
 *
 *  @param table Per-module name table.
 *  @return Semantic environment with split value/type namespaces.
 */
inline Compiler_Module_Semantic_Environment compiler_build_module_semantic_environment(
  const Compiler_Module_Name_Table &table)
{
  Compiler_Module_Semantic_Environment env;

  for (size_t i = 0; i < table.modules.size(); ++i)
    {
      const auto &source = table.modules.access(i);
      Compiler_Module_Semantic_Module module;
      module.module_name = source.module_name;
      module.module_index = source.module_index;
      module.order_index = source.order_index;

      for (size_t j = 0; j < source.names.size(); ++j)
        {
          const auto &item = source.names.access(j);
          if (item.kind == Compiler_Module_Export_Kind::Type)
            module.types.append(item);
          else
            module.values.append(item);
        }

      for (size_t j = 0; j < source.ambiguous_names.size(); ++j)
        {
          const auto &item = source.ambiguous_names.access(j);
          if (item.namespace_kind == Compiler_Module_Export_Kind::Type)
            Compiler_Module_Semantic_Environment_Detail::append_unique_name(module.ambiguous_types,
                                                                            item.name);
          else
            Compiler_Module_Semantic_Environment_Detail::append_unique_name(module.ambiguous_values,
                                                                            item.name);
        }

      env.modules.append(std::move(module));
    }

  return env;
}

/** @brief Finds one semantic environment by module name. */
inline const Compiler_Module_Semantic_Module *compiler_find_module_semantic_environment(
  const Compiler_Module_Semantic_Environment &env, const std::string_view module_name) noexcept
{
  for (size_t i = 0; i < env.modules.size(); ++i)
    if (env.modules.access(i).module_name == module_name)
      return &env.modules.access(i);
  return nullptr;
}

/** @brief Looks up one visible value-namespace binding in a module environment. */
inline const Compiler_Module_Bound_Name *compiler_lookup_module_value(
  const Compiler_Module_Semantic_Environment &env,
  const std::string_view module_name,
  const std::string_view symbol_name) noexcept
{
  const auto *module = compiler_find_module_semantic_environment(env, module_name);
  if (module == nullptr)
    return nullptr;

  for (size_t i = 0; i < module->values.size(); ++i)
    if (module->values.access(i).name == symbol_name)
      return &module->values.access(i);
  return nullptr;
}

/** @brief Looks up one visible type-namespace binding in a module environment. */
inline const Compiler_Module_Bound_Name *compiler_lookup_module_type(
  const Compiler_Module_Semantic_Environment &env,
  const std::string_view module_name,
  const std::string_view symbol_name) noexcept
{
  const auto *module = compiler_find_module_semantic_environment(env, module_name);
  if (module == nullptr)
    return nullptr;

  for (size_t i = 0; i < module->types.size(); ++i)
    if (module->types.access(i).name == symbol_name)
      return &module->types.access(i);
  return nullptr;
}

/** @brief Renders one deterministic text artifact for semantic environments. */
inline std::string compiler_render_module_semantic_environment(
  const Compiler_Module_Semantic_Environment &env)
{
  std::ostringstream out;
  out << "ModuleSemanticEnvironment\n";
  for (size_t i = 0; i < env.modules.size(); ++i)
    {
      const auto &module = env.modules.access(i);
      out << "  Module(" << module.module_name << ") order=" << module.order_index << '\n';
      for (size_t j = 0; j < module.values.size(); ++j)
        {
          const auto &item = module.values.access(j);
          out << "    Value(" << compiler_module_export_kind_name(item.kind) << "(" << item.name
              << ")) -> " << item.provider_module_name << ' '
              << (item.imported ? "imported" : "local") << '\n';
        }
      for (size_t j = 0; j < module.types.size(); ++j)
        {
          const auto &item = module.types.access(j);
          out << "    Type(" << item.name << ") -> " << item.provider_module_name << ' '
              << (item.imported ? "imported" : "local") << '\n';
        }
      for (size_t j = 0; j < module.ambiguous_values.size(); ++j)
        out << "    AmbiguousValue(" << module.ambiguous_values.access(j) << ")\n";
      for (size_t j = 0; j < module.ambiguous_types.size(); ++j)
        out << "    AmbiguousType(" << module.ambiguous_types.access(j) << ")\n";
    }
  return out.str();
}
}  // namespace Aleph

#endif