Make Ident abstract; imports of Data.ByteString.Char8 down from 29 to 16 modules

Most of the explicit uses of ByteStrings were eliminated by using identS,

	identS = identC . BS.pack 

which was found in GF.Grammar.CF and moved to GF.Infra.Ident. The function

	prefixIdent :: String -> Ident -> Ident

allowed one additional import of ByteString to be eliminated. The functions

	isArgIdent :: Ident -> Bool
	getArgIndex :: Ident -> Maybe Int

were needed to eliminate explicit pattern matching on Ident from two modules.

src/compiler/GF/Compile/Compute/AppPredefined.hs

@@ -16,14 +16,13 @@ module GF.Compile.Compute.AppPredefined (
           isInPredefined, typPredefined, arrityPredefined, predefModInfo, appPredefined
 		  ) where
 
-import GF.Infra.Ident
+import GF.Infra.Ident(identS)
 import GF.Infra.Option
 import GF.Data.Operations
 import GF.Grammar
 import GF.Grammar.Predef
 
 import qualified Data.Map as Map
-import qualified Data.ByteString.Char8 as BS
 import Text.PrettyPrint
 import Data.Char (isUpper,toUpper,toLower)
 
@@ -90,11 +89,8 @@ primitives = Map.fromList
     fun from to = oper (mkFunType from to)
     oper ty     = ResOper (Just (noLoc ty)) Nothing
 
-    varL :: Ident
-    varL = identC (BS.pack "L")
-
-    varP :: Ident
-    varP = identC (BS.pack "P")
+    varL = identS "L"
+    varP = identS "P"
 
 appPredefined :: Term -> Err (Term,Bool)
 appPredefined t = case t of
@@ -127,7 +123,7 @@ appPredefined t = case t of
       (EInt i, EInt j) | f == cLessInt -> retb $ if i<j  then predefTrue else predefFalse
       (EInt i, EInt j) | f == cPlus    -> retb $ EInt $ i+j
       (_,      t)      | f == cShow  && notVar t  -> retb $ foldrC $ map K $ words $ render (ppTerm Unqualified 0 t)
-      (_,      K s)    | f == cRead    -> retb $ Cn (identC (BS.pack s)) --- because of K, only works for atomic tags
+      (_,      K s)    | f == cRead    -> retb $ Cn (identS s) --- because of K, only works for atomic tags
       (_,      t)      | f == cToStr   -> trm2str t >>= retb
       _ -> retb t ---- prtBad "cannot compute predefined" t
 

src/compiler/GF/Compile/Compute/ConcreteLazy.hs

@@ -508,8 +508,7 @@ computeTermOpt gr = comput True where
 -- | argument variables cannot be glued
 checkNoArgVars :: Term -> Comp Term
 checkNoArgVars t = case t of
-  Vr (IA _ _)    -> fail $ glueErrorMsg $ ppTerm Unqualified 0 t 
-  Vr (IAV _ _ _) -> fail $ glueErrorMsg $ ppTerm Unqualified 0 t 
+  Vr x | isArgIdent x -> fail $ glueErrorMsg $ ppTerm Unqualified 0 t
   _ -> composOp checkNoArgVars t
 
 glueErrorMsg s = 

src/compiler/GF/Compile/Compute/ConcreteNew.hs

@@ -19,7 +19,6 @@ import Control.Monad(ap,liftM,liftM2,mplus,unless)
 import Data.List (findIndex,intersect,isInfixOf,nub,elemIndex,(\\))
 import Data.Char (isUpper,toUpper,toLower)
 import Text.PrettyPrint
-import qualified Data.ByteString.Char8 as BS
 import qualified Data.Map as Map
 --import Debug.Trace(trace)
 
@@ -80,7 +79,7 @@ resource env (m,c) =
 resourceValues :: SourceGrammar -> GlobalEnv
 resourceValues gr = env
   where
-    env = GE gr rvs (L NoLoc IW)
+    env = GE gr rvs (L NoLoc identW)
     rvs = Map.mapWithKey moduleResources (moduleMap gr)
     moduleResources m = Map.mapWithKey (moduleResource m) . jments
     moduleResource m c _info = do L l t <- lookupResDefLoc gr (m,c)
@@ -115,7 +114,7 @@ value env t0 =
     Vr x   -> var env x
     Q x@(m,f)
       | m == cPredef -> if f==cErrorType                -- to be removed
-                        then let p = identC (BS.pack "P")   
+                        then let p = identS "P"
                              in const # value0 env (mkProd [(Implicit,p,typeType)] (Vr p) [])
                         else const . flip VApp [] # predef f
       | otherwise    -> const # resource env x --valueResDef (fst env) x

src/compiler/GF/Compile/Compute/ConcreteNew1.hs

@@ -9,7 +9,6 @@ import GF.Grammar.Predef
 import GF.Data.Operations
 import Data.List (intersect)
 import Text.PrettyPrint
-import qualified Data.ByteString.Char8 as BS
 
 normalForm :: SourceGrammar -> Term -> Term
 normalForm gr t = value2term gr [] (eval gr [] t)
@@ -44,7 +43,7 @@ eval gr env (Vr x)   = case lookup x env of
                          Nothing -> error ("Unknown variable "++showIdent x)
 eval gr env (Q x)
   | x == (cPredef,cErrorType)                            -- to be removed
-                     = let varP = identC (BS.pack "P")   
+                     = let varP = identS "P"
                        in eval gr [] (mkProd [(Implicit,varP,typeType)] (Vr varP) [])
   | fst x == cPredef = VApp x []
   | otherwise        = case lookupResDef gr x of