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52 lines
1.9 KiB
52 lines
1.9 KiB
#pragma once
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#include <map>
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#include <string>
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#include <set>
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#include <optional>
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#include "graph.hpp"
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#include "type.hpp"
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struct type_env;
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using type_env_ptr = std::shared_ptr<type_env>;
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enum class visibility { global,local };
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class type_env {
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private:
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struct variable_data {
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type_scheme_ptr type;
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visibility vis;
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std::optional<std::string> mangled_name;
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variable_data()
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: variable_data(nullptr, visibility::local, std::nullopt) {}
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variable_data(type_scheme_ptr t, visibility v, std::optional<std::string> n)
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: type(std::move(t)), vis(v), mangled_name(std::move(n)) {}
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};
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type_env_ptr parent;
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std::map<std::string, variable_data> names;
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std::map<std::string, type_ptr> type_names;
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public:
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type_env(type_env_ptr p) : parent(std::move(p)) {}
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type_env() : type_env(nullptr) {}
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void find_free(const type_mgr& mgr, std::set<std::string>& into) const;
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void find_free_except(const type_mgr& mgr, const group& avoid,
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std::set<std::string>& into) const;
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type_scheme_ptr lookup(const std::string& name) const;
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bool is_global(const std::string& name) const;
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void set_mangled_name(const std::string& name, const std::string& mangled);
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const std::string& get_mangled_name(const std::string& name) const;
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type_ptr lookup_type(const std::string& name) const;
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void bind(const std::string& name, type_ptr t,
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visibility v = visibility::local);
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void bind(const std::string& name, type_scheme_ptr t,
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visibility v = visibility::local);
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void bind_type(const std::string& type_name, type_ptr t);
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void generalize(const std::string& name, const group& grp, type_mgr& mgr);
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};
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type_env_ptr type_scope(type_env_ptr parent);
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