Add line comments

2 files changed, 13 insertions, 3 deletions

diff --git a/samples/variables.sample b/samples/variables.sample
index 43d798c..5ea1105 100644
--- a/samples/variables.sample
+++ b/samples/variables.sample
@@ -1,2 +1,8 @@
+-- store foo = 10
 10 $foo !
+
+-- load and print foo
+$foo ?
+
+-- print 1 + value at foo
 1 $foo @ + .
diff --git a/src/main.hs b/src/main.hs
index fc5d60c..cfa5f65 100644
--- a/src/main.hs
+++ b/src/main.hs
@@ -41,11 +41,14 @@ interpretWord ((LVariable a) : b : stack) dict word@(LSymbol "!") =
    in pure (stack, newDict)
 interpretWord ((LVariable a) : stack) dict word@(LSymbol "@") =
   let lookupWord = dict ! a
-      newDict = M.delete a dict
-   in pure (lookupWord : stack, newDict)
+   in pure (lookupWord : stack, dict)
 interpretWord (a : stack) dict word@(LSymbol ".") = do
   putStrLn $ reprWord a
   pure (stack, dict)
+interpretWord ((LVariable a) : stack) dict word@(LSymbol "?") = do
+  let lookupWord = dict ! a
+  putStrLn $ reprWord lookupWord
+  pure (stack, dict)
 -- math
 interpretWord ((LInteger a) : (LInteger b) : stack) dict word@(LSymbol "+") = pure $ (LInteger (a + b) : stack, dict)
 -- error
@@ -58,7 +61,8 @@ main = do
   putStrLn $ "[info] executing file " ++ filename
   source <- readFile filename
   putStrLn source
-  let parsed = parseSource source
+  let sourceWoComments = source $> lines .> filter (\line -> not ("--" `isPrefixOf` line)) .> unlines
+  let parsed = parseSource sourceWoComments
   putStrLn $ "[info] parsed words:\n" ++ show parsed
   putStrLn "[info] interpreter output:"
   interpretSource [] M.empty parsed