96 lines
2.2 KiB
C++
96 lines
2.2 KiB
C++
#pragma once
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#include <memory>
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#include <map>
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#include <string>
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#include <vector>
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#include <set>
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struct type_mgr;
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struct type {
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virtual ~type() = default;
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virtual void print(const type_mgr& mgr, std::ostream& to) const = 0;
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};
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using type_ptr = std::shared_ptr<type>;
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struct type_scheme {
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std::vector<std::string> forall;
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type_ptr monotype;
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type_scheme(type_ptr type) : forall(), monotype(std::move(type)) {}
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void print(const type_mgr& mgr, std::ostream& to) const;
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type_ptr instantiate(type_mgr& mgr) const;
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};
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using type_scheme_ptr = std::shared_ptr<type_scheme>;
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struct type_var : public type {
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std::string name;
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type_var(std::string n)
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: name(std::move(n)) {}
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void print(const type_mgr& mgr, std::ostream& to) const;
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};
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struct type_base : public type {
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std::string name;
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int32_t arity;
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type_base(std::string n, int32_t a = 0)
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: name(std::move(n)), arity(a) {}
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void print(const type_mgr& mgr, std::ostream& to) const;
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};
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struct type_data : public type_base {
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struct constructor {
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int tag;
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};
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std::map<std::string, constructor> constructors;
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type_data(std::string n, int32_t a = 0)
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: type_base(std::move(n), a) {}
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};
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struct type_arr : public type {
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type_ptr left;
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type_ptr right;
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type_arr(type_ptr l, type_ptr r)
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: left(std::move(l)), right(std::move(r)) {}
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void print(const type_mgr& mgr, std::ostream& to) const;
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};
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struct type_app : public type {
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type_ptr constructor;
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std::vector<type_ptr> arguments;
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type_app(type_ptr c)
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: constructor(std::move(c)) {}
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void print(const type_mgr& mgr, std::ostream& to) const;
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};
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struct type_mgr {
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int last_id = 0;
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std::map<std::string, type_ptr> types;
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std::string new_type_name();
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type_ptr new_type();
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type_ptr new_arrow_type();
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void unify(type_ptr l, type_ptr r);
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type_ptr substitute(
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const std::map<std::string, type_ptr>& subst,
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const type_ptr& t) const;
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type_ptr resolve(type_ptr t, type_var*& var) const;
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void bind(const std::string& s, type_ptr t);
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void find_free(const type_ptr& t, std::set<std::string>& into) const;
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};
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