65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
#include "type_env.hpp"
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#include "type.hpp"
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void type_env::find_free(const type_mgr& mgr, std::set<std::string>& into) const {
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if(parent != nullptr) parent->find_free(mgr, into);
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for(auto& binding : names) {
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mgr.find_free(binding.second, into);
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}
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}
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void type_env::find_free_except(const type_mgr& mgr, const std::string& avoid,
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std::set<std::string>& into) const {
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if(parent != nullptr) parent->find_free(mgr, into);
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for(auto& binding : names) {
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if(binding.first == avoid) continue;
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mgr.find_free(binding.second, into);
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}
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}
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type_scheme_ptr type_env::lookup(const std::string& name) const {
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auto it = names.find(name);
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if(it != names.end()) return it->second;
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if(parent) return parent->lookup(name);
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return nullptr;
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}
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type_ptr type_env::lookup_type(const std::string& name) const {
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auto it = type_names.find(name);
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if(it != type_names.end()) return it->second;
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if(parent) return parent->lookup_type(name);
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return nullptr;
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}
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void type_env::bind(const std::string& name, type_ptr t) {
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names[name] = type_scheme_ptr(new type_scheme(t));
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}
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void type_env::bind(const std::string& name, type_scheme_ptr t) {
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names[name] = t;
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}
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void type_env::bind_type(const std::string& type_name, type_ptr t) {
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if(lookup_type(type_name) != nullptr) throw 0;
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type_names[type_name] = t;
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}
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void type_env::generalize(const std::string& name, type_mgr& mgr) {
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auto names_it = names.find(name);
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if(names_it == names.end()) throw 0;
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if(names_it->second->forall.size() > 0) throw 0;
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std::set<std::string> free_in_type;
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std::set<std::string> free_in_env;
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mgr.find_free(names_it->second->monotype, free_in_type);
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find_free_except(mgr, name, free_in_env);
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for(auto& free : free_in_type) {
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if(free_in_env.find(free) != free_in_env.end()) continue;
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names_it->second->forall.push_back(free);
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}
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}
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type_env_ptr type_scope(type_env_ptr parent) {
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return type_env_ptr(new type_env(std::move(parent)));
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}
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