Added function type inference

[cc1516.git] / yard.icl

diff --git a/yard.icl b/yard.icl
index 9b2ec23..612efd1 100644 (file)
--- a/yard.icl
+++ b/yard.icl
@@ -21,71 +21,64 @@ instance toString Error where
 
 runParser :: (Parser a b) [a] -> (Either Error b, [a])
 runParser (Parser f) i = f i
-
-instance + Error where
-       (+) r1 r2 = r2 //TODO
  
 instance Functor (Parser a) where
-    fmap f m = liftM f m
+       fmap f m = liftM f m
 
 instance Applicative (Parser a) where
-    pure a      = Parser \i -> (Right a, i)
-    (<*>) sf p  = ap sf p
+       pure a    = Parser \i -> (Right a, i)
+       (<*>) sf p  = ap sf p
 
 instance Monad (Parser a) where
-    bind p f    = Parser \i -> case runParser p i of
-        (Right r, rest) = runParser (f r) rest
-        (Left e, _)     = (Left e, i)
+       bind p f        = Parser \i -> case runParser p i of
+               (Right r, rest) = runParser (f r) rest
+               (Left e, _)      = (Left e, i)
 
 instance Alternative (Parser a) where
-    empty       = Parser \i -> (Left $ Error "" , i)
-    (<|>) p1 p2 = Parser \i -> case runParser p1 i of
-        (Right r, rest) = (Right r, rest)
-        (Left e1, rest) = case runParser p2 i of
-            (Left e2, rest)  = (Left $ e1+e2, i)
-            (Right r, rest)  = (Right r, rest)
-
-//Try the parser, if it fails decorate the error with Expected of the given String and position
+       empty      = Parser \i -> (Left $ Error "" , i)
+       (<|>) p1 p2 = Parser \i -> case runParser p1 i of
+               (Right r, rest) = (Right r, rest)
+               (Left e1, rest) = case runParser p2 i of
+                       (Left e2, rest)  = (Left e2, i)
+                       (Right r, rest)  = (Right r, rest)
+
+//Try parser, if it fails decorate the error with the given String and position
 (<?>) :: (Parser a b) Error -> Parser a b
 (<?>) p e = Parser \i -> case runParser p i of
-    (Left e1, rest) = (Left $ e1 + e, rest)
-    (Right r, rest) = (Right r, rest)
+       (Left e1, rest) = (Left e, rest)
+       (Right r, rest) = (Right r, rest)
 
 fail :: Parser a b
 fail = empty
 
 top :: Parser a a
 top = Parser \i -> case i of
-    []      = (Left $ Error "", [])
-    [x:xs]  = (Right x, xs)
+       []        = (Left $ Error "", [])
+       [x:xs]  = (Right x, xs)
 
 peek :: Parser a a
 peek = Parser \i -> case i of
-    []      = (Left $ Error "", [])
-    [x:xs]  = (Right x, [x:xs])
+       []        = (Left $ Error "", [])
+       [x:xs]  = (Right x, [x:xs])
 
-//runs the left parser until the right parser succeeds. Returns the result of the left parser 
-//Note: if the right parser consumes input then this input is lost!
-//If the left parser fails before the right parser succeeds the whole parser fails
 (until) infix 2 :: (Parser a b) (Parser a c) -> Parser a [b]
 (until) p guard = try $ until` p guard [] 
-    where
-        until` :: (Parser a b) (Parser a c) [b] -> Parser a [b]
-        until` p guard acc = Parser \i -> case runParser guard i of 
-            (Right _, rest) = (Right acc, rest)
-            (Left _, _)     = case runParser p i of
-                (Right r, rest) = runParser (until` p guard [r:acc]) rest
-                (Left e, _)     = (Left e, i)
-        try :: (Parser a b) -> Parser a b
-        try p = Parser \i -> case runParser p i of
-            (Left e, _)     = (Left e, i)
-            (Right r, rest) = (Right r, rest)
-
+       where
+               until` :: (Parser a b) (Parser a c) [b] -> Parser a [b]
+               until` p guard acc = Parser \i -> case runParser guard i of 
+                       (Right _, rest) = (Right acc, rest)
+                       (Left _, _)      = case runParser p i of
+                               (Right r, rest) = runParser (until` p guard [r:acc]) rest
+                               (Left e, _)      = (Left e, i)
+               try :: (Parser a b) -> Parser a b
+               try p = Parser \i -> case runParser p i of
+                       (Left e, _)      = (Left e, i)
+                       (Right r, rest) = (Right r, rest)
 
 eof :: Parser a Void
 eof = Parser \i -> case i of 
-    []      = (Right Void, [])
-    _       = (Left $ Error "", i)
+       []      = (Right Void, [])
+       _       = (Left $ Error "", i)
 
 satisfy :: (a -> Bool) -> Parser a a
 satisfy f = top >>= \r -> if (f r) (return r) fail