a script for cloning (Phrasebook) grammars

examples/phrasebook/Clone.hs

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+module Main where
+
+import Control.Monad
+import Data.Maybe
+import System.Cmd
+import System.Directory
+import System.Environment
+import System.Exit
+
+
+-- To clone a project from one language to another:
+--
+-- 1. for each Module in modules, copy ModuleFROM to ModuleTO
+-- 2. in each ModuleTO, replace substrings FROM by TO, if not prefixes of an Ident
+-- 3. in each ModuleTO in specifics, comment out every line in the body
+--
+-- Syntax:  runghc Clone FROM TO
+-- Example: runhugs Clone Swe Nor
+
+-- The following lines are for the phrasebook project, but can be modified to other projects.
+
+modules   = "Phrasebook":"Sentences":specifics
+specifics = ["Words","Greetings"]
+
+
+main = do
+  from:to:_ <- getArgs
+  mapM_ (clone from to) modules
+
+clone from to pref = do
+  s <- readFile (pref ++ from ++ ".gf")
+  writeFile (pref ++ to ++ ".gf") (commentIf (isSpecific pref) (replaceLang from to s))
+
+isSpecific = flip elem specifics
+
+replaceLang s1 s2 = repl where
+  repl s = case s of
+    c:cs -> case splitAt lgs s of
+      (pre,c:rest) | pre == s1 && elem c " ,:=(){}.-[]" -> s2 ++ [c] ++ repl rest
+      _                      -> c : repl cs
+    _ -> s
+  lgs = 3 -- length s1
+
+-- the file name has the form p....pLLL.gf, i.e. 3-letter lang name, suffix .gf
+getLangName fi = let (nal,ferp) = splitAt 3 (drop 3 (reverse fi)) in (reverse ferp,reverse nal)  
+
+commentIf c = if c then (unlines . commentBody . lines) else id
+
+commentBody ss = header ++ map comment body ++ ["}"] where
+  (header,body) = break (isJment . words) ss
+  isJment ws = case ws of
+    k:_ | elem k ["flags","lin","lincat","oper","param"] -> True
+    _ -> False
+  comment l = "-- " ++ l