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Type alias JList

This commit is contained in:
sforman 2023-07-29 08:49:31 -07:00
parent 9917a2cfba
commit e9f971460f
1 changed files with 12 additions and 20 deletions
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32
implementations/Elm/src/Joy.elm
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@ -12,11 +12,11 @@ type JoyType
| JoyTrue
| JoyFalse
type alias JoyList = List JoyType
type alias JList = List JoyType
joy : (List JoyType) -> (List JoyType) -> Result String (List JoyType)
joy : JList -> JList -> Result String JList
joy stack expression =
case expression of
[] ->
@ -31,7 +31,7 @@ joy stack expression =
joy (term :: stack) rest_of_expression
joy_eval : String -> (List JoyType) -> (List JoyType) -> Result String (List JoyType, List JoyType)
joy_eval : String -> JList -> JList -> Result String (JList, JList)
joy_eval symbol stack expression =
case symbol of
"+" -> joy_binary_math_op (+) stack expression
@ -45,7 +45,7 @@ joy_eval symbol stack expression =
_ -> Err ("Unknown word: " ++ symbol)
joy_binary_math_op : (Int -> Int -> Int) -> (List JoyType) -> (List JoyType) -> Result String (List JoyType, List JoyType)
joy_binary_math_op : (Int -> Int -> Int) -> JList -> JList -> Result String (JList, JList)
joy_binary_math_op op stack expression =
case pop_int(stack) of
Ok (a, s0) ->
@ -59,24 +59,15 @@ joy_binary_math_op op stack expression =
push_int : Int -> (List JoyType) -> (List JoyType)
push_int : Int -> JList -> JList
push_int i stack = (JoyInt i) :: stack
pop_int : (List JoyType) -> Result String (Int, List JoyType)
pop_int : JList -> Result String (Int, JList)
pop_int stack = pop_any stack |> andThen isnt_int
-- case stack of
-- [] -> Err "Not enough values on Stack"
-- h :: t ->
-- case h of
-- JoyInt i ->
-- Ok (i, t)
-- _ ->
-- Err "Not an integer."
pop_any : (List JoyType) -> Result String (JoyType, List JoyType)
pop_any : JList -> Result String (JoyType, JList)
pop_any stack =
case stack of
[] ->
@ -84,7 +75,8 @@ pop_any stack =
item :: rest ->
Ok (item, rest)
isnt_int : (JoyType, List JoyType) -> Result String (Int, List JoyType)
isnt_int : (JoyType, JList) -> Result String (Int, JList)
isnt_int (item, stack) =
case item of
JoyInt i ->
@ -132,14 +124,14 @@ tokenator tok =
expect_right_bracket : (List String) -> (List JoyType) -> Result String (List JoyType, List String)
expect_right_bracket : (List String) -> JList -> Result String (JList, List String)
expect_right_bracket tokens acc =
case tokens of
[] -> Err "Missing closing bracket."
h :: t -> expect_right_bracket_one_token_lookahead h t acc
expect_right_bracket_one_token_lookahead : String -> (List String) -> (List JoyType) -> Result String (List JoyType, List String)
expect_right_bracket_one_token_lookahead : String -> (List String) -> JList -> Result String (JList, List String)
expect_right_bracket_one_token_lookahead token tokens acc =
case token of
"]" -> Ok (acc, tokens)
@ -171,7 +163,7 @@ one_token_lookahead token tokens =
_ -> Ok (tokenator token, tokens)
parse0 : (List String) -> (List JoyType) -> Result String (List JoyType)
parse0 : (List String) -> JList -> Result String JList
parse0 tokens acc =
case tokens of
[] -> Ok acc