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Introduce env_scoped_t

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env_scoped_t lives between environment_t and env_stack_t.
It represents the read-only logic of env_stack_t and will be used to back
the new environment snapshot implementation.
This commit is contained in:
ridiculousfish 2019-04-14 13:37:44 -07:00
parent 46fd47a0da
commit 1d464da698
2 changed files with 35 additions and 20 deletions
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14
src/env.cpp
View file

@ -216,8 +216,10 @@ static const string_set_t env_electric = {L"history", L"pipestatus", L"status",
static bool is_electric(const wcstring &key) { return contains(env_electric, key); }
env_stack_t::env_stack_t() : vars_(make_unique<var_stack_t>()) {}
env_stack_t::env_stack_t(std::unique_ptr<var_stack_t> vars) : vars_(std::move(vars)) {}
env_scoped_t::env_scoped_t() : env_scoped_t(make_unique<var_stack_t>()) {}
env_scoped_t::env_scoped_t(std::unique_ptr<var_stack_t> vars) : vars_(std::move(vars)) {}
env_scoped_t::env_scoped_t(env_scoped_t &&) = default;
env_scoped_t::~env_scoped_t() = default;
void env_stack_t::universal_barrier() {
ASSERT_IS_MAIN_THREAD();
@ -233,9 +235,9 @@ void env_stack_t::universal_barrier() {
}
// Get the variable stack
var_stack_t &env_stack_t::vars_stack() { return *vars_; }
var_stack_t &env_scoped_t::vars_stack() { return *vars_; }
const var_stack_t &env_stack_t::vars_stack() const { return *vars_; }
const var_stack_t &env_scoped_t::vars_stack() const { return *vars_; }
/// Return the current umask value.
static mode_t get_umask() {
@ -856,7 +858,7 @@ static maybe_t<env_var_t> get_electric(const wcstring &key, const environment_t
DIE("unrecognized electric var name");
}
maybe_t<env_var_t> env_stack_t::get(const wcstring &key, env_mode_flags_t mode) const {
maybe_t<env_var_t> env_scoped_t::get(const wcstring &key, env_mode_flags_t mode) const {
const bool has_scope = mode & (ENV_LOCAL | ENV_GLOBAL | ENV_UNIVERSAL);
const bool search_local = !has_scope || (mode & ENV_LOCAL);
const bool search_global = !has_scope || (mode & ENV_GLOBAL);
@ -953,7 +955,7 @@ static void add_key_to_string_set(const var_table_t &envs, std::set<wcstring> *s
}
}
wcstring_list_t env_stack_t::get_names(int flags) const {
wcstring_list_t env_scoped_t::get_names(int flags) const {
scoped_lock locker(env_lock);
wcstring_list_t result;

41
src/env.h
View file

@ -193,13 +193,36 @@ class null_environment_t : public environment_t {
wcstring_list_t get_names(int flags) const override;
};
/// A environment stack of scopes. This is the main class that tracks fish variables.
/// An environment stack of scopes.
/// The base implementation provides read-only access.
struct var_stack_t;
class env_node_t;
class env_stack_t final : public environment_t {
friend class parser_t;
class env_scoped_t : public environment_t {
private:
std::unique_ptr<var_stack_t> vars_;
protected:
var_stack_t &vars_stack();
const var_stack_t &vars_stack() const;
explicit env_scoped_t(std::unique_ptr<var_stack_t> vars_);
env_scoped_t();
env_scoped_t(env_scoped_t &&);
public:
/// Gets the variable with the specified name, or none() if it does not exist.
maybe_t<env_var_t> get(const wcstring &key, env_mode_flags_t mode = ENV_DEFAULT) const override;
/// Returns all variable names.
wcstring_list_t get_names(int flags) const override;
~env_scoped_t() override;
};
/// A mutable env_scoped_t, that allows scopes to be pushed and popped.
class env_stack_t final : public env_scoped_t {
friend class parser_t;
int set_internal(const wcstring &key, env_mode_flags_t var_mode, wcstring_list_t val);
bool try_remove(std::shared_ptr<env_node_t> n, const wchar_t *key, int var_mode);
@ -207,18 +230,11 @@ class env_stack_t final : public environment_t {
static env_stack_t make_principal();
var_stack_t &vars_stack();
const var_stack_t &vars_stack() const;
explicit env_stack_t(std::unique_ptr<var_stack_t> vars_);
env_stack_t();
using env_scoped_t::env_scoped_t;
~env_stack_t() override;
env_stack_t(env_stack_t &&);
public:
/// Gets the variable with the specified name, or none() if it does not exist.
maybe_t<env_var_t> get(const wcstring &key, env_mode_flags_t mode = ENV_DEFAULT) const override;
/// Sets the variable with the specified name to the given values.
int set(const wcstring &key, env_mode_flags_t mode, wcstring_list_t vals);
@ -254,9 +270,6 @@ class env_stack_t final : public environment_t {
/// Returns an array containing all exported variables in a format suitable for execv
const char *const *export_arr();
/// Returns all variable names.
wcstring_list_t get_names(int flags) const override;
/// Update the termsize variable.
void set_termsize();