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module Language where
import qualified Ast as A
import Compiler
import Control.Monad.State (evalState)
import Data.Foldable (find)
import qualified Error as E
import Lexer (scan)
import Parser (parse)
import Test.HUnit
import Text.Parsec (runParser)
import Text.Parsec.Pos (newPos)
assertAst :: String -> [A.Expr] -> Assertion
assertAst input expected = do
r <- return $ runParser (scan parse) () "test" input
case r of
Left e -> assertFailure $ show e
Right ast -> assertEqual "" expected ast
expectError :: String -> E.ErrorType -> Assertion
expectError input etyp = do
r <- return $ runParser (scan parse) () "test" input
case r of
Left e -> assertFailure $ show e
Right ast -> do
res <- return $ evalState (compileAll ast) startState
case res of
Left e -> case (find (\(E.Error t _ _) -> t == etyp) e) of
Just _ -> return ()
Nothing -> assertFailure $ "expected " ++ show etyp ++ " didn't happen"
Right _ -> assertFailure "expected error, didn't happen"
testCase1 =
TestLabel "parse module" $
TestCase $
assertAst "module main" [A.Module "main" $ newPos "test" 1 1]
testCase2 =
TestLabel
"parse a function"
$ TestCase $
assertAst
"module main\n\
\def fn() { }"
[ A.Module "main" $ newPos "test" 1 1,
A.Func "fn" [] Nothing [] False False $ newPos "test" 2 1
]
testCase3 =
TestLabel
"parse a function with parameters"
$ TestCase $
assertAst
"module main\n\
\def fn(a: u8) { }"
[ A.Module "main" $ newPos "test" 1 1,
A.Func "fn" [("a", A.Type "u8", newPos "test" 2 8)] Nothing [] False False $ newPos "test" 2 1
]
testCase4 =
TestLabel
"parse a function with return value"
$ TestCase $
assertAst
"module main\n\
\def fn(): u8 {\n\
\return 1; }"
[ A.Module "main" $ newPos "test" 1 1,
A.Func "fn" [] (Just $ A.Type "u8") [A.Return (Just $ A.Num 1 $ newPos "test" 3 8) $ newPos "test" 3 1] False False $ newPos "test" 2 1
]
testCase5 =
TestLabel
"parse a function call"
$ TestCase $
assertAst
"module main\n\
\def fn() { }\n\
\fn();"
[ A.Module "main" $ newPos "test" 1 1,
A.Func "fn" [] Nothing [] False False $ newPos "test" 2 1,
A.Call (A.Var "fn" $ newPos "test" 3 1) [] $ newPos "test" 3 1
]
testCase6 =
TestLabel
"parse a function call with arguments"
$ TestCase $
assertAst
"module main\n\
\def fn(a: u8) { }\n\
\fn(10);"
[ A.Module "main" $ newPos "test" 1 1,
A.Func "fn" [("a", A.Type "u8", newPos "test" 2 8)] Nothing [] False False $ newPos "test" 2 1,
A.Call (A.Var "fn" $ newPos "test" 3 1) [A.Num 10 $ newPos "test" 3 4] $ newPos "test" 3 1
]
testCase7 =
TestLabel
"parse empty return on a function"
$ TestCase $
assertAst
"module main\n\
\def fn() {\n\
\return; }"
[ A.Module "main" $ newPos "test" 1 1,
A.Func "fn" [] Nothing [A.Return Nothing $ newPos "test" 3 1] False False $ newPos "test" 2 1
]
testCase8 =
TestLabel
"parse a recursive function"
$ TestCase $
assertAst
"module main\n\
\def fn() {\n\
\fn(); }"
[ A.Module "main" $ newPos "test" 1 1,
A.Func "fn" [] Nothing [A.Call (A.Var "fn" $ newPos "test" 3 1) [] $ newPos "test" 3 1] False False $ newPos "test" 2 1
]
testCase9 =
TestLabel
"parse a function with a function parameter"
$ TestCase $
assertAst
"module main\n\
\def fn1() { }\n\
\def fn2(f: ()) {\n\
\f(); }\n\
\fn2(fn1);"
[ A.Module "main" $ newPos "test" 1 1,
A.Func "fn1" [] Nothing [] False False $ newPos "test" 2 1,
A.Func
"fn2"
[("f", A.FuncType [] Nothing, newPos "test" 3 9)]
Nothing
[ A.Call (A.Var "f" $ newPos "test" 4 1) [] $ newPos "test" 4 1
]
False
False
$ newPos "test" 3 1,
A.Call (A.Var "fn2" $ newPos "test" 5 1) [A.Var "fn1" $ newPos "test" 5 5] $ newPos "test" 5 1
]
testCase10 =
TestLabel
"parse a function with a function parameter (lambda)"
$ TestCase $
assertAst
"module main\n\
\def fn(f: ()) {\n\
\f(); }\n\
\fn(() { });"
[ A.Module "main" $ newPos "test" 1 1,
A.Func
"fn"
[("f", A.FuncType [] Nothing, newPos "test" 2 8)]
Nothing
[A.Call (A.Var "f" $ newPos "test" 3 1) [] $ newPos "test" 3 1]
False
False
$ newPos "test" 2 1,
A.Call (A.Var "fn" $ newPos "test" 4 1) [A.Func "lambda@4,4" [] Nothing [] True True $ newPos "test" 4 4] $ newPos "test" 4 1
]
testCase11 =
TestLabel "parse a call to lambda" $
TestCase $
assertAst
"module main\n\
\() { }();"
[ A.Module "main" $ newPos "test" 1 1,
A.Call (A.Func "lambda@2,1" [] Nothing [] True True $ newPos "test" 2 1) [] $ newPos "test" 2 1
]
-- test errors
testCase12 =
TestLabel "invalid return value (empty return)" $
TestCase $
expectError
"module main\n\
\def fn(): u8 { return; }"
E.TypeError
testCase13 =
TestLabel "invalid return value" $
TestCase $
expectError
"module main\n\
\def fn(): u16 { return 1; }"
E.TypeError
testCase14 =
TestLabel "return without function" $
TestCase $
expectError
"module main\n\
\return;"
E.UnexpectedReturn
testCase15 =
TestLabel "symbol already defined" $
TestCase $
expectError
"module main\n\
\def fn() { }\n\
\def fn() { }"
E.AlreadyDefined
testCase16 =
TestLabel "parameter already defined" $
TestCase $
expectError
"module main\n\
\def fn(a: u8, a: u8) { }\n"
E.AlreadyDefined
testCase17 =
TestLabel "call on non callable" $
TestCase $
expectError
"module main\n\
\def fn(a: u8): u8 { return a(); }\n"
E.NonCallable
language =
[ testCase1,
testCase2,
testCase3,
testCase4,
testCase5,
testCase6,
testCase7,
testCase8,
testCase9,
testCase10,
testCase11,
testCase12,
testCase13,
testCase14,
testCase15,
testCase16,
testCase17
]
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