diff options
| author | Camil Staps | 2016-02-02 19:24:50 +0100 |
|---|---|---|
| committer | Camil Staps | 2016-02-02 19:24:50 +0100 |
| commit | a7d7542dc646a5fd124ef71e71ce260889f1701b (patch) | |
| tree | 04ed89503bbb3cc9933273a1326a53ca724c3492 /1415/files/practicum/RefactorXX.dcl | |
| parent | week6 camil: working positioning of lines by putting empties at left and righ... (diff) | |
Diffstat (limited to '1415/files/practicum/RefactorXX.dcl')
| -rw-r--r-- | 1415/files/practicum/RefactorXX.dcl | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/1415/files/practicum/RefactorXX.dcl b/1415/files/practicum/RefactorXX.dcl new file mode 100644 index 0000000..4b7748f --- /dev/null +++ b/1415/files/practicum/RefactorXX.dcl @@ -0,0 +1,26 @@ +definition module RefactorXX
+
+:: Expr = NR Int
+ | VAR Name
+ | OP Expr Operator Expr
+ | LET Name Expr Expr
+:: Name :== String
+:: Operator = PLUS | MIN | MUL | DIV
+:: Val a = Result a | Undef
+
+class fail c :: c a
+class return c :: a -> c a
+class (>>=) infix 0 c :: (c a) (a -> c b) -> c b
+class Monad c | return, >>= c
+class MonadFail c | Monad, fail c
+
+instance fail [], Val
+instance return [], Val
+instance >>= [], Val
+
+from StdClass import class toString
+
+instance toString Expr
+free :: Expr -> [Name]
+remove_unused_lets :: Expr -> Expr
+eval :: Expr -> c Int | MonadFail c
|