C++ const_string_set_t类代码示例

void env_destroy()
{
    env_universal_destroy();

    while (&top->env != global)
    {
        env_pop();
    }

    env_read_only.clear();
    env_electric.clear();

    var_table_t::iterator iter;
    for (iter = global->begin(); iter != global->end(); ++iter)
    {
        const var_entry_t &entry = iter->second;
        if (entry.exportv)
        {
            mark_changed_exported();
            break;
        }
    }

    delete top;
}

wcstring_list_t env_get_names(int flags)
{
    scoped_lock lock(env_lock);

    wcstring_list_t result;
    std::set<wcstring> names;
    int show_local = flags & ENV_LOCAL;
    int show_global = flags & ENV_GLOBAL;
    int show_universal = flags & ENV_UNIVERSAL;

    env_node_t *n=top;
    const bool show_exported = (flags & ENV_EXPORT) || !(flags & ENV_UNEXPORT);
    const bool show_unexported = (flags & ENV_UNEXPORT) || !(flags & ENV_EXPORT);

    if (!show_local && !show_global && !show_universal)
    {
        show_local =show_universal = show_global=1;
    }

    if (show_local)
    {
        while (n)
        {
            if (n == global_env)
                break;

            add_key_to_string_set(n->env, &names, show_exported, show_unexported);
            if (n->new_scope)
                break;
            else
                n = n->next;

        }
    }

    if (show_global)
    {
        add_key_to_string_set(global_env->env, &names, show_exported, show_unexported);
        if (show_unexported)
        {
            result.insert(result.end(), env_electric.begin(), env_electric.end());
        }

        if (show_exported)
        {
            result.push_back(L"COLUMNS");
            result.push_back(L"LINES");
        }

    }

    if (show_universal && uvars())
    {
        const wcstring_list_t uni_list = uvars()->get_names(show_exported, show_unexported);
        names.insert(uni_list.begin(), uni_list.end());
    }

    result.insert(result.end(), names.begin(), names.end());
    return result;
}

void env_init(const struct config_paths_t *paths /* or NULL */)
{
    /*
      env_read_only variables can not be altered directly by the user
    */

    const wchar_t * const ro_keys[] =
    {
        L"status",
        L"history",
        L"version",
        L"_",
        L"LINES",
        L"COLUMNS",
        L"PWD",
        //L"SHLVL", // will be inserted a bit lower down
        L"FISH_VERSION",
    };
    for (size_t i=0; i < sizeof ro_keys / sizeof *ro_keys; i++)
    {
        env_read_only.insert(ro_keys[i]);
    }

    /*
       Names of all dynamically calculated variables
       */
    env_electric.insert(L"history");
    env_electric.insert(L"status");
    env_electric.insert(L"umask");
    env_electric.insert(L"COLUMNS");
    env_electric.insert(L"LINES");

    top = new env_node_t;
    global_env = top;
    global = &top->env;

    /*
      Now the environemnt variable handling is set up, the next step
      is to insert valid data
    */

    /*
      Import environment variables
    */
    for (char **p = (environ ? environ : __environ); p && *p; p++)
    {
        const wcstring key_and_val = str2wcstring(*p); //like foo=bar
        size_t eql = key_and_val.find(L'=');
        if (eql == wcstring::npos)
        {
            // no equals found
            if (is_read_only(key_and_val) || is_electric(key_and_val)) continue;
            env_set(key_and_val, L"", ENV_EXPORT | ENV_GLOBAL);
        }
        else
        {
            wcstring key = key_and_val.substr(0, eql);
            if (is_read_only(key) || is_electric(key)) continue;
            wcstring val = key_and_val.substr(eql + 1);
            if (variable_is_colon_delimited_array(key))
            {
                std::replace(val.begin(), val.end(), L':', ARRAY_SEP);
            }

            env_set(key, val.c_str(), ENV_EXPORT | ENV_GLOBAL);
        }
    }

    /* Set the given paths in the environment, if we have any */
    if (paths != NULL)
    {
        env_set(FISH_DATADIR_VAR, paths->data.c_str(), ENV_GLOBAL);
        env_set(FISH_SYSCONFDIR_VAR, paths->sysconf.c_str(), ENV_GLOBAL);
        env_set(FISH_HELPDIR_VAR, paths->doc.c_str(), ENV_GLOBAL);
        env_set(FISH_BIN_DIR, paths->bin.c_str(), ENV_GLOBAL);
    }

    /*
      Set up the PATH variable
    */
    setup_path();

    /*
      Set up the USER variable
    */
    if (env_get_string(L"USER").missing_or_empty())
    {
        const struct passwd *pw = getpwuid(getuid());
        if (pw && pw->pw_name)
        {
            const wcstring uname = str2wcstring(pw->pw_name);
            env_set(L"USER", uname.c_str(), ENV_GLOBAL | ENV_EXPORT);
        }
    }

    /*
      Set up the version variables
    */
    wcstring version = str2wcstring(get_fish_version());
    env_set(L"version", version.c_str(), ENV_GLOBAL);
//.........这里部分代码省略.........

static bool is_electric(const wcstring &key)
{
    return env_electric.find(key.c_str()) != env_electric.end();
}

static bool is_read_only(const wcstring &key)
{
    return env_read_only.find(key.c_str()) != env_read_only.end();
}

void env_init(const struct config_paths_t *paths /* or NULL */)
{
    /*
      env_read_only variables can not be altered directly by the user
    */

    const wchar_t * const ro_keys[] =
    {
        L"status",
        L"history",
        L"version",
        L"_",
        L"LINES",
        L"COLUMNS",
        L"PWD",
        L"SHLVL",
        L"FISH_VERSION",
    };
    for (size_t i=0; i < sizeof ro_keys / sizeof *ro_keys; i++)
    {
        env_read_only.insert(ro_keys[i]);
    }

    /*
      HOME and USER should be writeable by root, since this can be a
      convenient way to install software.
    */
    if (getuid() != 0)
    {
        env_read_only.insert(L"HOME");
        env_read_only.insert(L"USER");
    }

    /*
       Names of all dynamically calculated variables
       */
    env_electric.insert(L"history");
    env_electric.insert(L"status");
    env_electric.insert(L"umask");

    top = new env_node_t;
    global_env = top;
    global = &top->env;

    /*
      Now the environemnt variable handling is set up, the next step
      is to insert valid data
    */

    /*
      Import environment variables
    */
    for (char **p = (environ ? environ : __environ); p && *p; p++)
    {
        const wcstring key_and_val = str2wcstring(*p); //like foo=bar
        size_t eql = key_and_val.find(L'=');
        if (eql == wcstring::npos)
        {
            // no equals found
            env_set(key_and_val, L"", ENV_EXPORT);
        }
        else
        {
            wcstring key = key_and_val.substr(0, eql);
            wcstring val = key_and_val.substr(eql + 1);
            if (variable_can_be_array(val))
            {
                std::replace(val.begin(), val.end(), L':', ARRAY_SEP);
            }

            env_set(key, val.c_str(), ENV_EXPORT | ENV_GLOBAL);
        }
    }

    /* Set the given paths in the environment, if we have any */
    if (paths != NULL)
    {
        env_set(FISH_DATADIR_VAR, paths->data.c_str(), ENV_GLOBAL | ENV_EXPORT);
        env_set(FISH_SYSCONFDIR_VAR, paths->sysconf.c_str(), ENV_GLOBAL | ENV_EXPORT);
        env_set(FISH_HELPDIR_VAR, paths->doc.c_str(), ENV_GLOBAL | ENV_EXPORT);
        env_set(FISH_BIN_DIR, paths->bin.c_str(), ENV_GLOBAL | ENV_EXPORT);
    }

    /*
      Set up the PATH variable
    */
    setup_path();

    /*
      Set up the USER variable
    */
    const struct passwd *pw = getpwuid(getuid());
    if (pw && pw->pw_name)
    {
        const wcstring uname = str2wcstring(pw->pw_name);
        env_set(L"USER", uname.c_str(), ENV_GLOBAL | ENV_EXPORT);
    }

    /*
      Set up the version variables
//.........这里部分代码省略.........