From 54a1e0f879be657863cdcaed37fa609241369e8f Mon Sep 17 00:00:00 2001
From: peb <unknown>
Date: Wed, 11 May 2005 09:28:16 +0000
Subject: "Committed_by_peb"

---
 src/GF/Parsing/MCFG.hs | 49 +++++++++++++++++++++++++++----------------------
 1 file changed, 27 insertions(+), 22 deletions(-)

(limited to 'src/GF/Parsing/MCFG.hs')

diff --git a/src/GF/Parsing/MCFG.hs b/src/GF/Parsing/MCFG.hs
index 4cfc6e2ec..6aec811de 100644
--- a/src/GF/Parsing/MCFG.hs
+++ b/src/GF/Parsing/MCFG.hs
@@ -4,9 +4,9 @@
 -- Stability   : (stable)
 -- Portability : (portable)
 --
--- > CVS $Date: 2005/05/09 09:28:45 $ 
+-- > CVS $Date: 2005/05/11 10:28:16 $ 
 -- > CVS $Author: peb $
--- > CVS $Revision: 1.4 $
+-- > CVS $Revision: 1.5 $
 --
 -- MCFG parsing
 -----------------------------------------------------------------------------
@@ -30,30 +30,35 @@ import qualified GF.Parsing.MCFG.Incremental2 as Incremental2
 ----------------------------------------------------------------------
 -- parsing
 
--- parseMCF :: (Ord c, Ord n, Ord l, Ord t) => String -> Err (MCFParser c n l t)
+parseMCF :: (Ord c, Ord n, Ord l, Ord t) => String -> Err (MCFParser c n l t)
+parseMCF prs | prs `elem` strategies = Ok $ parseMCF' prs
+	     | otherwise = Bad $ "MCFG parsing strategy not defined: " ++ prs 
 
-parseMCF "n"  pinfo starts toks = Ok $ Naive.parse pinfo starts toks 
-parseMCF "an" pinfo starts toks = Ok $ Active.parse "n" pinfo starts toks 
-parseMCF "ab" pinfo starts toks = Ok $ Active.parse "b" pinfo starts toks 
-parseMCF "at" pinfo starts toks = Ok $ Active.parse "t" pinfo starts toks 
-parseMCF "i"  pinfo starts toks = Ok $ Incremental.parse pinfo starts toks 
 
-parseMCF "an2" pinfo starts toks = Ok $ Active2.parse "n" pinfo starts toks 
-parseMCF "ab2" pinfo starts toks = Ok $ Active2.parse "b" pinfo starts toks 
-parseMCF "at2" pinfo starts toks = Ok $ Active2.parse "t" pinfo starts toks 
-parseMCF "i2"  pinfo starts toks = Ok $ Incremental2.parse pinfo starts toks
+strategies = words "bottomup topdown n an ab at i an2 ab2 at2 i2 rn ran rab rat ri"
 
-parseMCF "rn"  pinfo starts toks = Ok $ Naive.parseR (rrP pinfo toks) starts 
-parseMCF "ran" pinfo starts toks = Ok $ Active.parseR "n" (rrP pinfo toks) starts 
-parseMCF "rab" pinfo starts toks = Ok $ Active.parseR "b" (rrP pinfo toks) starts 
-parseMCF "rat" pinfo starts toks = Ok $ Active.parseR "t" (rrP pinfo toks) starts 
-parseMCF "ri"  pinfo starts toks = Ok $ Incremental.parseR (rrP pinfo toks) starts ntoks
-    where ntoks = snd (inputBounds toks)
 
--- default parsers:
-parseMCF ""  pinfo starts toks = parseMCF "n"  pinfo starts toks 
--- error parser:
-parseMCF prs pinfo starts toks  = Bad $ "Parser not defined: " ++ prs 
+parseMCF' :: (Ord c, Ord n, Ord l, Ord t) => String -> MCFParser c n l t
+
+parseMCF' "bottomup" pinfo starts toks = Active.parse "b" pinfo starts toks 
+parseMCF' "topdown"  pinfo starts toks = Active.parse "t" pinfo starts toks 
+
+parseMCF' "n"  pinfo starts toks = Naive.parse pinfo starts toks 
+parseMCF' "an" pinfo starts toks = Active.parse "n" pinfo starts toks 
+parseMCF' "ab" pinfo starts toks = Active.parse "b" pinfo starts toks 
+parseMCF' "at" pinfo starts toks = Active.parse "t" pinfo starts toks 
+parseMCF' "i"  pinfo starts toks = Incremental.parse pinfo starts toks 
 
+parseMCF' "an2" pinfo starts toks = Active2.parse "n" pinfo starts toks 
+parseMCF' "ab2" pinfo starts toks = Active2.parse "b" pinfo starts toks 
+parseMCF' "at2" pinfo starts toks = Active2.parse "t" pinfo starts toks 
+parseMCF' "i2"  pinfo starts toks = Incremental2.parse pinfo starts toks
+
+parseMCF' "rn"  pinfo starts toks = Naive.parseR (rrP pinfo toks) starts 
+parseMCF' "ran" pinfo starts toks = Active.parseR "n" (rrP pinfo toks) starts 
+parseMCF' "rab" pinfo starts toks = Active.parseR "b" (rrP pinfo toks) starts 
+parseMCF' "rat" pinfo starts toks = Active.parseR "t" (rrP pinfo toks) starts 
+parseMCF' "ri"  pinfo starts toks = Incremental.parseR (rrP pinfo toks) starts ntoks
+    where ntoks = snd (inputBounds toks)
 
 rrP pi = rangeRestrictPInfo pi
-- 
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