bloglang/12/type_env.cpp

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#include "type_env.hpp"
#include "type.hpp"
void type_env::find_free(const type_mgr& mgr, std::set<std::string>& into) const {
if(parent != nullptr) parent->find_free(mgr, into);
for(auto& binding : names) {
mgr.find_free(binding.second.type, into);
}
}
void type_env::find_free_except(const type_mgr& mgr, const std::string& avoid,
std::set<std::string>& into) const {
if(parent != nullptr) parent->find_free(mgr, into);
for(auto& binding : names) {
if(binding.first == avoid) continue;
mgr.find_free(binding.second.type, into);
}
}
type_scheme_ptr type_env::lookup(const std::string& name) const {
auto it = names.find(name);
if(it != names.end()) return it->second.type;
if(parent) return parent->lookup(name);
return nullptr;
}
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bool type_env::is_global(const std::string& name) const {
auto it = names.find(name);
if(it != names.end()) return it->second.vis == visibility::global;
if(parent) return parent->is_global(name);
return false;
}
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void type_env::set_mangled_name(const std::string& name, const std::string& mangled) {
auto it = names.find(name);
if(it != names.end()) it->second.mangled_name = mangled;
}
const std::string& type_env::get_mangled_name(const std::string& name) const {
auto it = names.find(name);
if(it != names.end())
return (it->second.mangled_name != "") ? it->second.mangled_name : name;
if(parent) return parent->get_mangled_name(name);
return name;
}
type_ptr type_env::lookup_type(const std::string& name) const {
auto it = type_names.find(name);
if(it != type_names.end()) return it->second;
if(parent) return parent->lookup_type(name);
return nullptr;
}
void type_env::bind(const std::string& name, type_ptr t, visibility v) {
type_scheme_ptr new_scheme(new type_scheme(std::move(t)));
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names[name] = variable_data(std::move(new_scheme), v, "");
}
void type_env::bind(const std::string& name, type_scheme_ptr t, visibility v) {
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names[name] = variable_data(std::move(t), v, "");
}
void type_env::bind_type(const std::string& type_name, type_ptr t) {
if(lookup_type(type_name) != nullptr) throw 0;
type_names[type_name] = t;
}
void type_env::generalize(const std::string& name, type_mgr& mgr) {
auto names_it = names.find(name);
if(names_it == names.end()) throw 0;
if(names_it->second.type->forall.size() > 0) throw 0;
std::set<std::string> free_in_type;
std::set<std::string> free_in_env;
mgr.find_free(names_it->second.type->monotype, free_in_type);
find_free_except(mgr, name, free_in_env);
for(auto& free : free_in_type) {
if(free_in_env.find(free) != free_in_env.end()) continue;
names_it->second.type->forall.push_back(free);
}
}
type_env_ptr type_scope(type_env_ptr parent) {
return type_env_ptr(new type_env(std::move(parent)));
}