Add parsed type data structure, type application and arity.

11/CMakeLists.txt

@@ -21,7 +21,9 @@ llvm_map_components_to_libnames(LLVM_LIBS core x86asmparser x86codegen)
 
 # Create compiler executable
 add_executable(compiler
-    ast.cpp ast.hpp definition.cpp
+    definition.cpp definition.hpp
+    parsed_type.cpp parsed_type.hpp
+    ast.cpp ast.hpp
     llvm_context.cpp llvm_context.hpp
     type_env.cpp type_env.hpp
     env.cpp env.hpp

11/parsed_type.cpp

@@ -0,0 +1,35 @@
+#include "parsed_type.hpp"
+#include "type.hpp"
+#include "type_env.hpp"
+
+type_ptr parsed_type_app::to_type(
+        const std::set<std::string>& vars,
+        const type_env& e) const {
+    auto parent_type = e.lookup_type(name);
+    if(parent_type == nullptr) throw 0;
+    type_base* base_type;
+    if(!(base_type = dynamic_cast<type_base*>(parent_type.get()))) throw 0;
+
+    type_app* new_app = new type_app(std::move(parent_type));
+    type_ptr to_return(new_app);
+    for(auto& arg : arguments) {
+        new_app->arguments.push_back(arg->to_type(vars, e));
+    }
+    return to_return;
+}
+
+type_ptr parsed_type_var::to_type(
+        const std::set<std::string>& vars,
+        const type_env& e) const {
+    if(vars.find(var) != vars.end()) throw 0;
+    return type_ptr(new type_var(var));
+}
+
+
+type_ptr parsed_type_arr::to_type(
+        const std::set<std::string>& vars,
+        const type_env& env) const {
+    auto new_left = left->to_type(vars, env);
+    auto new_right = right->to_type(vars, env);
+    return type_ptr(new type_arr(std::move(new_left), std::move(new_right)));
+}

11/parsed_type.hpp

@@ -0,0 +1,43 @@
+#pragma once
+#include <memory>
+#include <set>
+#include <string>
+#include "type_env.hpp"
+
+struct parsed_type {
+    virtual type_ptr to_type(
+            const std::set<std::string>& vars,
+            const type_env& env) const = 0;
+};
+
+using parsed_type_ptr = std::unique_ptr<parsed_type>;
+
+struct parsed_type_app : parsed_type {
+    std::string name;
+    std::vector<parsed_type_ptr> arguments;
+
+    parsed_type_app(
+            std::string n,
+            std::vector<parsed_type_ptr> as)
+        : name(std::move(n)), arguments(std::move(as)) {}
+
+    type_ptr to_type(const std::set<std::string>& vars, const type_env& env) const;
+};
+
+struct parsed_type_var : parsed_type {
+    std::string var;
+
+    parsed_type_var(std::string v) : var(std::move(v)) {}
+
+    type_ptr to_type(const std::set<std::string>& vars, const type_env& env) const;
+};
+
+struct parsed_type_arr : parsed_type {
+    parsed_type_ptr left;
+    parsed_type_ptr right;
+
+    parsed_type_arr(parsed_type_ptr l, parsed_type_ptr r)
+        : left(std::move(l)), right(std::move(r)) {}
+
+    type_ptr to_type(const std::set<std::string>& vars, const type_env& env) const;
+};

11/type.cpp

@@ -2,6 +2,7 @@
 #include <ostream>
 #include <sstream>
 #include <algorithm>
+#include <vector>
 #include "error.hpp"
 
 void type_scheme::print(const type_mgr& mgr, std::ostream& to) const {
@@ -27,6 +28,20 @@ type_ptr substitute(const type_mgr& mgr, const std::map<std::string, type_ptr>&
         auto right_result = substitute(mgr, subst, arr->right);
         if(left_result == arr->left && right_result == arr->right) return t;
         return type_ptr(new type_arr(left_result, right_result));
+    } else if(type_app* app = dynamic_cast<type_app*>(t.get())) {
+        auto constructor_result = substitute(mgr, subst, app->constructor);
+        bool arg_changed = false;
+        std::vector<type_ptr> new_args;
+        for(auto& arg : app->arguments) {
+            auto arg_result = substitute(mgr, subst, arg);
+            arg_changed |= arg_result != arg;
+            new_args.push_back(std::move(arg_result));
+        }
+
+        if(constructor_result == app->constructor && !arg_changed) return t;
+        type_app* new_app = new type_app(std::move(constructor_result));
+        std::swap(new_app->arguments, new_args);
+        return type_ptr(new_app);
     }
     return t;
 }
@@ -60,6 +75,15 @@ void type_arr::print(const type_mgr& mgr, std::ostream& to) const {
     to << ")";
 }
 
+void type_app::print(const type_mgr& mgr, std::ostream& to) const {
+    constructor->print(mgr, to);
+    to << "* ";
+    for(auto& arg : arguments) {
+        to << " ";
+        arg->print(mgr, to);
+    }
+}
+
 std::string type_mgr::new_type_name() {
     int temp = last_id++;
     std::string str = "";
@@ -99,12 +123,10 @@ type_ptr type_mgr::resolve(type_ptr t, type_var*& var) const {
 }
 
 void type_mgr::unify(type_ptr l, type_ptr r) {
-    type_var* lvar;
-    type_var* rvar;
-    type_arr* larr;
-    type_arr* rarr;
-    type_base* lid;
-    type_base* rid;
+    type_var *lvar, *rvar;
+    type_arr *larr, *rarr;
+    type_base *lid, *rid;
+    type_app *lapp, *rapp;
 
     l = resolve(l, lvar);
     r = resolve(r, rvar);
@@ -123,6 +145,17 @@ void type_mgr::unify(type_ptr l, type_ptr r) {
     } else if((lid = dynamic_cast<type_base*>(l.get())) &&
             (rid = dynamic_cast<type_base*>(r.get()))) {
         if(lid->name == rid->name) return;
+    } else if((lapp = dynamic_cast<type_app*>(l.get())) &&
+            (rapp = dynamic_cast<type_app*>(r.get()))) {
+        unify(lapp->constructor, rapp->constructor);
+        auto left_it = lapp->arguments.begin();
+        auto right_it = rapp->arguments.begin();
+        while(left_it != lapp->arguments.end() &&
+                right_it != rapp->arguments.end()) {
+            unify(*left_it, *right_it);
+            left_it++, right_it++;
+        }
+        return;
     }
 
     throw unification_error(l, r);
@@ -144,5 +177,8 @@ void type_mgr::find_free(const type_ptr& t, std::set<std::string>& into) const {
     } else if(type_arr* arr = dynamic_cast<type_arr*>(resolved.get())) {
         find_free(arr->left, into);
         find_free(arr->right, into);
+    } else if(type_app* app = dynamic_cast<type_app*>(resolved.get())) {
+        find_free(app->constructor, into);
+        for(auto& arg : app->arguments) find_free(arg, into);
     }
 }

11/type.hpp

@@ -38,9 +38,10 @@ struct type_var : public type {
 
 struct type_base : public type {
     std::string name;
+    int32_t arity;
 
-    type_base(std::string n) 
-        : name(std::move(n)) {}
+    type_base(std::string n, int32_t a = 0) 
+        : name(std::move(n)), arity(a) {}
 
     void print(const type_mgr& mgr, std::ostream& to) const;
 };
@@ -66,6 +67,16 @@ struct type_arr : public type {
     void print(const type_mgr& mgr, std::ostream& to) const;
 };
 
+struct type_app : public type {
+    type_ptr constructor;
+    std::vector<type_ptr> arguments;
+
+    type_app(type_ptr c)
+        : constructor(std::move(c)) {}
+
+    void print(const type_mgr& mgr, std::ostream& to) const;
+};
+
 struct type_mgr {
     int last_id = 0;
     std::map<std::string, type_ptr> types;