Introducing GF.Text.Pretty for more concise pretty printers and GF.Infra.Location for modularity

GF.Text.Pretty provides the class Pretty and overloaded versions of the pretty
printing combinators in Text.PrettyPrint, allowing pretty printable values to
be used directly instead of first having to convert them to Doc with functions
like text, int, char and ppIdent. Some modules have been converted to use
GF.Text.Pretty, but not all. Precedences could be added to simplify the pretty
printers for terms and patterns.

GF.Infra.Location contains the types Location and L, factored out from
GF.Grammar.Grammar, and the class HasSourcePath. This allowed the import
of GF.Grammar.Grammar to be removed from GF.Infra.CheckM, making it more
like a pure library module.

src/compiler/GF/Grammar/Macros.hs

@@ -31,7 +31,7 @@ import qualified Data.Traversable as T(mapM)
 import Control.Monad (liftM, liftM2, liftM3)
 --import Data.Char (isDigit)
 import Data.List (sortBy,nub)
-import Text.PrettyPrint
+import GF.Text.Pretty
 
 typeForm :: Type -> (Context, Cat, [Term])
 typeForm t =
@@ -45,7 +45,7 @@ typeForm t =
     Q  c -> ([],c,[])
     QC c -> ([],c,[])
     Sort c -> ([],(identW, c),[])
-    _      -> error (render (text "no normal form of type" <+> ppTerm Unqualified 0 t))
+    _      -> error (render ("no normal form of type" <+> ppTerm Unqualified 0 t))
 
 typeFormCnc :: Type -> (Context, Type)
 typeFormCnc t = 
@@ -170,7 +170,7 @@ projectRec :: Label -> [Assign] -> Term
 projectRec l rs =
   case lookup l rs of
     Just (_,t) -> t
-    Nothing    -> error (render (text "no value for label" <+> ppLabel l))
+    Nothing    -> error (render ("no value for label" <+> l))
 
 zipAssign :: [Label] -> [Term] -> [Assign]
 zipAssign ls ts = [assign l t | (l,t) <- zip ls ts]
@@ -194,7 +194,7 @@ mkRecType = mkRecTypeN 0
 record2subst :: Term -> Err Substitution
 record2subst t = case t of
   R fs -> return [(identC x, t) | (LIdent x,(_,t)) <- fs]
-  _    -> Bad (render (text "record expected, found" <+> ppTerm Unqualified 0 t))
+  _    -> Bad (render ("record expected, found" <+> ppTerm Unqualified 0 t))
 
 typeType, typePType, typeStr, typeTok, typeStrs :: Term
 
@@ -273,8 +273,8 @@ plusRecType t1 t2 = case (t1, t2) of
   (RecType r1, RecType r2) -> case
     filter (`elem` (map fst r1)) (map fst r2) of
       [] -> return (RecType (r1 ++ r2))
-      ls -> raise $ render (text "clashing labels" <+> hsep (map ppLabel ls))
-  _ -> raise $ render (text "cannot add record types" <+> ppTerm Unqualified 0 t1 <+> text "and" <+> ppTerm Unqualified 0 t2) 
+      ls -> raise $ render ("clashing labels" <+> hsep ls)
+  _ -> raise $ render ("cannot add record types" <+> ppTerm Unqualified 0 t1 <+> "and" <+> ppTerm Unqualified 0 t2) 
 
 --plusRecord :: Term -> Term -> Err Term
 plusRecord t1 t2 =
@@ -283,7 +283,7 @@ plusRecord t1 t2 =
                               (l,v) <- r1, not (elem l (map fst r2)) ] ++ r2))
    (_,    FV rs) -> mapM (plusRecord t1) rs >>= return . FV
    (FV rs,_    ) -> mapM (`plusRecord` t2) rs >>= return . FV
-   _ -> raise $ render (text "cannot add records" <+> ppTerm Unqualified 0 t1 <+> text "and" <+> ppTerm Unqualified 0 t2)
+   _ -> raise $ render ("cannot add records" <+> ppTerm Unqualified 0 t1 <+> "and" <+> ppTerm Unqualified 0 t2)
 
 -- | default linearization type
 defLinType :: Type
@@ -386,7 +386,7 @@ term2patt trm = case termForm trm of
   Ok ([], Cn c, []) -> do
     return (PMacro c)
 
-  _ -> Bad $ render (text "no pattern corresponds to term" <+> ppTerm Unqualified 0 trm)
+  _ -> Bad $ render ("no pattern corresponds to term" <+> ppTerm Unqualified 0 trm)
 
 patt2term :: Patt -> Term
 patt2term pt = case pt of
@@ -450,7 +450,7 @@ strsFromTerm t = case t of
            ]
   FV ts -> mapM strsFromTerm ts >>= return . concat
   Strs ts -> mapM strsFromTerm ts >>= return . concat  
-  _ -> raise (render (text "cannot get Str from term" <+> ppTerm Unqualified 0 t))
+  _ -> raise (render ("cannot get Str from term" <+> ppTerm Unqualified 0 t))
 
 -- | to print an Str-denoting term as a string; if the term is of wrong type, the error msg
 stringFromTerm :: Term -> String
@@ -609,7 +609,7 @@ topoSortJments :: ErrorMonad m => SourceModule -> m [(Ident,Info)]
 topoSortJments (m,mi) = do
   is <- either
           return
-          (\cyc -> raise (render (text "circular definitions:" <+> fsep (map ppIdent (head cyc)))))
+          (\cyc -> raise (render ("circular definitions:" <+> fsep (head cyc))))
           (topoTest (allDependencies (==m) (jments mi)))
   return (reverse [(i,info) | i <- is, Ok info <- [lookupTree showIdent i (jments mi)]])
 
@@ -617,8 +617,8 @@ topoSortJments2 :: ErrorMonad m => SourceModule -> m [[(Ident,Info)]]
 topoSortJments2 (m,mi) = do
   iss <- either
            return
-           (\cyc -> raise (render (text "circular definitions:"
-                                   <+> fsep (map ppIdent (head cyc)))))
+           (\cyc -> raise (render ("circular definitions:"
+                                   <+> fsep (head cyc))))
            (topoTest2 (allDependencies (==m) (jments mi)))
   return
     [[(i,info) | i<-is,Ok info<-[lookupTree showIdent i (jments mi)]] | is<-iss]