Generated GF and GFC lexers with BNFC with string sharing support.

src/GF/Canon/LexGFC.hs

@@ -1,8 +1,9 @@
 {-# OPTIONS -fglasgow-exts -cpp #-}
-{-# LINE 4 "LexGFC.x" #-}
+{-# LINE 3 "LexGFC.x" #-}
 module LexGFC where
-import SharedString -- H
+
 import ErrM
+import SharedString
 
 #if __GLASGOW_HASKELL__ >= 503
 import Data.Array
@@ -34,13 +35,16 @@ alex_accept = listArray (0::Int,14) [[],[],[(AlexAccSkip)],[(AlexAcc (alex_actio
 
 tok f p s = f p s
 
+share :: String -> String
+share = shareString
+
 data Tok =
-   TS !String     -- reserved words  -- H
- | TL !String     -- string literals -- H
- | TI String     -- integer literals
- | TV !String     -- identifiers     -- H
- | TD String     -- double precision float literals
- | TC String     -- character literals
+   TS !String     -- reserved words
+ | TL !String     -- string literals
+ | TI !String     -- integer literals
+ | TV !String     -- identifiers
+ | TD !String     -- double precision float literals
+ | TC !String     -- character literals
 
  deriving (Eq,Show,Ord)
 
@@ -69,15 +73,14 @@ data BTree = N | B String Tok BTree BTree deriving (Show)
 
 eitherResIdent :: (String -> Tok) -> String -> Tok
 eitherResIdent tv s = treeFind resWords
-    where 
-    treeFind N = tv s
-    treeFind (B a t left right) | s < a  = treeFind left
-				| s > a  = treeFind right
-				| s == a = t
+  where
+  treeFind N = tv s
+  treeFind (B a t left right) | s < a  = treeFind left
+                              | s > a  = treeFind right
+                              | s == a = t
 
 resWords = b "lin" (b "concrete" (b "Type" (b "Str" (b "Ints" N N) N) (b "cat" (b "abstract" N N) N)) (b "fun" (b "flags" (b "data" N N) N) (b "in" (b "grammar" N N) N))) (b "pre" (b "open" (b "of" (b "lincat" N N) N) (b "param" (b "oper" N N) N)) (b "transfer" (b "table" (b "resource" N N) N) (b "variants" N N)))
-      where b s = B s (TS s)
-
+   where b s = B s (TS s)
 
 unescapeInitTail :: String -> String
 unescapeInitTail = unesc . tail where
@@ -129,10 +132,10 @@ alexGetChar (p, _, (c:s)) =
 alexInputPrevChar :: AlexInput -> Char
 alexInputPrevChar (p, c, s) = c
 
-alex_action_1 = tok (\p s -> PT p (TS $ shareString s)) 
-alex_action_2 = tok (\p s -> PT p (eitherResIdent (TV . shareString) s)) 
-alex_action_3 = tok (\p s -> PT p (TL $ shareString $ unescapeInitTail s)) 
-alex_action_4 = tok (\p s -> PT p (TI s))    
+alex_action_1 = tok (\p s -> PT p (TS $ share s)) 
+alex_action_2 = tok (\p s -> PT p (eitherResIdent (TV . share) s)) 
+alex_action_3 = tok (\p s -> PT p (TL $ share $ unescapeInitTail s)) 
+alex_action_4 = tok (\p s -> PT p (TI $ share s))    
 {-# LINE 1 "GenericTemplate.hs" #-}
 {-# LINE 1 "<built-in>" #-}
 {-# LINE 1 "<command line>" #-}