1 files changed, 35 insertions, 0 deletions
diff --git a/src-3.0/PGF/Raw/Print.hs b/src-3.0/PGF/Raw/Print.hs
new file mode 100644
index 000000000..d34adbc2b
--- /dev/null
+++ b/src-3.0/PGF/Raw/Print.hs
@@ -0,0 +1,35 @@
+module PGF.Raw.Print (printTree) where
+
+import PGF.CId
+import PGF.Raw.Abstract
+
+import Data.List (intersperse)
+import Numeric (showFFloat)
+import qualified Data.ByteString.Char8 as BS
+
+printTree :: Grammar -> String
+printTree g = prGrammar g ""
+
+prGrammar :: Grammar -> ShowS
+prGrammar (Grm xs) = prRExpList xs
+
+prRExp :: Int -> RExp -> ShowS
+prRExp _ (App x []) = showString x
+prRExp n (App x xs) = p (showString x . showChar ' ' . prRExpList xs)
+    where p s = if n == 0 then s else showChar '(' . s . showChar ')'
+prRExp _ (AInt x) = shows x
+prRExp _ (AStr x) = showChar '"' . concatS (map mkEsc x) . showChar '"'
+prRExp _ (AFlt x) = showFFloat Nothing x
+prRExp _ AMet = showChar '?'
+
+mkEsc :: Char -> ShowS
+mkEsc s = case s of
+  '"'  -> showString "\\\""
+  '\\' -> showString "\\\\"
+  _    -> showChar s
+
+prRExpList :: [RExp] -> ShowS
+prRExpList = concatS . intersperse (showChar ' ') . map (prRExp 1)
+
+concatS :: [ShowS] -> ShowS
+concatS = foldr (.) id