Added eof parser

diff --git a/src/yard.dcl b/src/yard.dcl
index cedf0df..a029c4b 100644 (file)
--- a/src/yard.dcl
+++ b/src/yard.dcl
@@ -6,6 +6,7 @@ from StdClass import class Eq
 from Data.Functor import class Functor
 from Control.Monad import class Monad
 from Control.Applicative import class Applicative, class Alternative
+import Data.Void
 
 :: Error = ParseError | LexError String | Unexpected String Int
 :: Parser a b = Parser ([a] -> (Either Error b, [a]))
@@ -26,3 +27,4 @@ satisfy :: (a -> Bool) -> Parser a a
 check :: (a -> Bool) -> Parser a a
 item :: a -> Parser a a | Eq a
 list :: [a] -> Parser a [a] | Eq a
+eof :: Parser a Void

diff --git a/src/yard.icl b/src/yard.icl
index 81e5883..582ea1d 100644 (file)
--- a/src/yard.icl
+++ b/src/yard.icl
@@ -12,6 +12,7 @@ import Data.Either
 import Control.Monad
 import Control.Applicative
 from Data.Func import $
+import Data.Void
 
 instance toString Error where
        toString ParseError = "General parse error"
@@ -65,6 +66,11 @@ peek = Parser \i -> case i of
     []      = (Left ParseError, [])
     [x:xs]  = (Right x, [x:xs])
 
+eof :: Parser a Void
+eof = Parser \i -> case i of 
+    []      = (Right Void, [])
+    _       = (Left ParseError, i)
+
 satisfy :: (a -> Bool) -> Parser a a
 satisfy f = top >>= \r -> if (f r) (return r) fail
 
@@ -75,4 +81,4 @@ item :: a -> Parser a a | Eq a
 item a  = satisfy ((==)a)
 
 list :: [a] -> Parser a [a] | Eq a
-list as = mapM item as
+list as = mapM item as
\ No newline at end of file