From: Ramakrishnan Muthukrishnan <ram@rkrishnan.org>
Date: Sun, 28 Dec 2014 08:19:34 +0000 (+0530)
Subject: hw11: exercise 2 - spaces and ident
X-Git-Url: https://git.rkrishnan.org/specifications/%5B?a=commitdiff_plain;h=2e594c0ef1af839a4e85139357c751f3140c1a8e;p=yorgey.git

hw11: exercise 2 - spaces and ident
---

diff --git a/hw11/SExpr.hs b/hw11/SExpr.hs
index c3f7d70..b70683a 100644
--- a/hw11/SExpr.hs
+++ b/hw11/SExpr.hs
@@ -6,6 +6,7 @@ module SExpr where
 
 import AParser
 import Control.Applicative
+import Data.Char(isSpace, isAlpha, isAlphaNum)
 
 ------------------------------------------------------------
 --  1. Parsing repetitions
@@ -29,10 +30,10 @@ oneOrMore p = liftA2 (:) p (zeroOrMore p)
 ------------------------------------------------------------
 
 spaces :: Parser String
-spaces = undefined
+spaces = zeroOrMore (satisfy isSpace)
 
 ident :: Parser String
-ident = undefined
+ident = liftA2 (:) (satisfy isAlpha) (zeroOrMore (satisfy isAlphaNum))
 
 ------------------------------------------------------------
 --  3. Parsing S-expressions