1 files changed, 40 insertions, 0 deletions
diff --git a/src/Language/SimpleShell/Parser/Common/Lexeme.hs b/src/Language/SimpleShell/Parser/Common/Lexeme.hs
new file mode 100644
index 0000000..c0a6fd6
--- /dev/null
+++ b/src/Language/SimpleShell/Parser/Common/Lexeme.hs
@@ -0,0 +1,40 @@
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE FlexibleContexts #-}
+
+module Language.SimpleShell.Parser.Common.Lexeme
+  ( lexeme
+  , symbol
+  , commentFirstChars
+  )
+where
+
+
+import Control.Monad (void)
+import Data.Text (Text)
+import Text.Megaparsec (MonadParsec)
+import Text.Megaparsec.Char (space1)
+import qualified Text.Megaparsec.Char.Lexer as L
+  ( lexeme
+  , symbol
+  , space
+  , skipLineComment
+  , skipBlockComment
+  )
+
+
+-- Must be kept in sync with 'commentFirstChars'.
+sc :: (MonadParsec e Text m) => m ()
+sc = L.space
+  space1
+  (L.skipLineComment "//")
+  (L.skipBlockComment "/*" "*/")
+
+-- | List of all characters that may start a comment.
+commentFirstChars :: [Char]
+commentFirstChars = "/"
+
+lexeme :: (MonadParsec e Text m) => m a -> m a
+lexeme = L.lexeme sc
+
+symbol :: (MonadParsec e Text m) => Text -> m ()
+symbol = void . L.symbol sc