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(** Copyright 2026, Dmitrii Kuznetsov *)
(** SPDX-License-Identifier: LGPL-3.0-or-later *)
open C_sharp_strange_lib.Typecheck
open C_sharp_strange_lib.Parser
open C_sharp_strange_lib.Ast
open C_sharp_strange_lib.Common
let show_wrap = function
| Some (Program x) ->
(match typecheck x with
| _, Result.Ok _ -> Format.print_string "Ok!\n"
| _, Result.Error e -> Format.printf "%a\n%!" pp_error e)
| _ -> Format.print_string "Parsing error\n"
;;
let print_tc p str = show_wrap (parse_option p str)
let test_typecheck = print_tc parse_prog
let%expect_test "Factorial" =
test_typecheck
{|
class Program {
int Fac(int num) {
if (num == 1) {
return 1;
}
else
{
return num * Fac(num - 1);
}
}
public static int Main() {
return Fac(5);
}
} |};
[%expect
{|
Ok! |}]
;;
let%expect_test "Wrong factorial" =
test_typecheck
{|
class Program {
int Fac(int num) {
if (num == 1) {
return "one";
}
}
} |};
[%expect
{|
(TCError (OtherError "Returned type does not match the function type")) |}]
;;
let%expect_test "Already declared variable" =
test_typecheck
{|
class Program {
int a = 5;
int b = 9;
int a = 9;
} |};
[%expect
{|
(TCError (OtherError "This variable is already declared")) |}]
;;
let%expect_test "Invalid value" =
test_typecheck
{|
class Program {
public static int Main() {
int a;
int b = a -1 + 4;
return b;
}
} |};
[%expect
{|
(TCError (OtherError "Variable not found: a"))|}]
;;
let%expect_test "Checking fields" =
test_typecheck
{|
class Program {
int b = 9;
int c = b * 67;
int a = (50 % 2) + b - c;
bool r = (a != b * c) || (a >= b) && (a == c +90);
string s = "ok";
char h = 'a';
void M() {
a = 5;
r = s != "kkkk" && (190%22 == 100 * -2/5);
}
} |};
[%expect
{|
Ok! |}]
;;
let%expect_test "String + int" =
test_typecheck
{|
class Program {
string a = "5";
int c = 9 + a;
} |};
[%expect
{|
(TCError TypeMismatch) |}]
;;
let%expect_test "While" =
test_typecheck
{|
class Program {
public static int Main() {
int count = 0;
bool b = true;
while(true) {
if (count != 2) {
count = count + 1;
b = b && false;
}
else if (b == false){
return -1;
}
else {
return 0;
}
}
}
} |};
[%expect
{|
Ok! |}]
;;
let%expect_test "For" =
test_typecheck
{|
class Program {
int n = 10;
int count = 7% 2*67;
public static int Main() {
for (int i = 0; i < n; i=i+1) {
for (int j = 1;;) {
for (;j != n; j = j + 2) {
for (;;) {
count = count + i + j;
}
}
}
}
return count;
}
} |};
[%expect
{|
Ok! |}]
;;
let%expect_test "Wrong main" =
test_typecheck
{|
class Program {
public async void Main() {}
}
|};
[%expect
{|
(TCError
(OtherError "Main must be static, non-async, no params, return int/void")) |}]
;;
let%expect_test "Already declared function" =
test_typecheck
{|
class Program {
void Test() {}
int a = 9;
void Test() {}
} |};
[%expect
{|
(TCError (OtherError "This variable is already declared")) |}]
;;
let%expect_test "Function type mismatch" =
test_typecheck
{|
class Program {
public void a(int n, int m){
return n+m;
}
}|};
[%expect
{|
(TCError TypeMismatch) |}]
;;
let%expect_test "Factorial with writeline" =
test_typecheck
{|
class Program {
int Fac(int num) {
if (num == 1) {
return 1;
}
else
{
return num * Fac(num - 1);
}
}
public static int Main() {
int result = Fac(5);
System.Console.WriteLine(result);
return result;
}
} |};
[%expect
{|
Ok! |}]
;;