lean2/src/library/private.cpp

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/*
Copyright (c) 2013 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
*/
#include <utility>
#include <string>
#include "util/hash.h"
#include "library/private.h"
#include "library/module.h"
#include "library/scope.h"
#include "library/kernel_bindings.h"
namespace lean {
struct private_ext : public environment_extension {
unsigned m_counter;
rb_map<name, name, name_quick_cmp> m_map; // map: user-name -> hidden-name
rb_map<name, name, name_quick_cmp> m_inv_map; // map: hidden-name -> user-name
private_ext():m_counter(0) {}
};
struct private_ext_reg {
unsigned m_ext_id;
private_ext_reg() { m_ext_id = environment::register_extension(std::make_shared<private_ext>()); }
};
static private_ext_reg g_ext;
static private_ext const & get_extension(environment const & env) {
return static_cast<private_ext const &>(env.get_extension(g_ext.m_ext_id));
}
static environment update(environment const & env, private_ext const & ext) {
return env.update(g_ext.m_ext_id, std::make_shared<private_ext>(ext));
}
static name g_private("private");
static std::string g_prv_key("prv");
// Make sure the mapping "hidden-name r ==> user-name n" is preserved when we close sections and
// export .olean files.
static environment preserve_private_data(environment const & env, name const & r, name const & n) {
if (scope::has_open_sections(env)) {
return scope::add(env, [=](scope::abstraction_context & ctx) {
environment env = ctx.env();
private_ext ext = get_extension(env);
ext.m_inv_map.insert(r, n);
ext.m_counter++;
ctx.update_env(preserve_private_data(update(env, ext), r, n));
});
} else {
return module::add(env, g_prv_key, [=](serializer & s) { s << n << r; });
}
}
std::pair<environment, name> add_private_name(environment const & env, name const & n, optional<unsigned> const & extra_hash) {
private_ext ext = get_extension(env);
unsigned h = hash(n.hash(), ext.m_counter);
if (extra_hash)
h = hash(h, *extra_hash);
name r = name(g_private, h) + n;
ext.m_map.insert(n, r);
ext.m_inv_map.insert(r, n);
ext.m_counter++;
environment new_env = update(env, ext);
new_env = preserve_private_data(new_env, r, n);
return mk_pair(new_env, r);
}
static void private_reader(deserializer & d, module_idx, shared_environment & senv,
std::function<void(asynch_update_fn const &)> &,
std::function<void(delayed_update_fn const &)> &) {
name n, h;
d >> n >> h;
senv.update([=](environment const & env) -> environment {
private_ext ext = get_extension(env);
// we restore only the mapping hidden-name -> user-name (for pretty printing purposes)
ext.m_inv_map.insert(h, n);
ext.m_counter++;
return update(env, ext);
});
}
register_module_object_reader_fn g_private_reader(g_prv_key, private_reader);
optional<name> hidden_to_user_name(environment const & env, name const & n) {
auto it = get_extension(env).m_inv_map.find(n);
return it ? optional<name>(*it) : optional<name>();
}
optional<name> user_to_hidden_name(environment const & env, name const & n) {
auto it = get_extension(env).m_map.find(n);
return it ? optional<name>(*it) : optional<name>();
}
static int add_private_name(lua_State * L) {
int nargs = lua_gettop(L);
optional<unsigned> h;
if (nargs > 2)
h = lua_tonumber(L, 3);
auto p = add_private_name(to_environment(L, 1), to_name_ext(L, 2), h);
push_environment(L, p.first);
push_name(L, p.second);
return 2;
}
static int hidden_to_user_name(lua_State * L) { return push_optional_name(L, hidden_to_user_name(to_environment(L, 1), to_name_ext(L, 2))); }
static int user_to_hidden_name(lua_State * L) { return push_optional_name(L, user_to_hidden_name(to_environment(L, 1), to_name_ext(L, 2))); }
void open_private(lua_State * L) {
SET_GLOBAL_FUN(add_private_name, "add_private_name");
SET_GLOBAL_FUN(hidden_to_user_name, "hidden_to_user_name");
SET_GLOBAL_FUN(user_to_hidden_name, "user_to_hidden_name");
}
}