From ac00f77dadd4d447803dd7cab5a36f47365325d0 Mon Sep 17 00:00:00 2001
From: peb <unknown>
Date: Mon, 11 Apr 2005 12:57:45 +0000
Subject: "Committed_by_peb"

---
 src/GF/Formalism/MCFG.hs | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 src/GF/Formalism/MCFG.hs

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

diff --git a/src/GF/Formalism/MCFG.hs b/src/GF/Formalism/MCFG.hs
new file mode 100644
index 000000000..b4abdc76a
--- /dev/null
+++ b/src/GF/Formalism/MCFG.hs
@@ -0,0 +1,47 @@
+----------------------------------------------------------------------
+-- |
+-- Maintainer  : PL
+-- Stability   : (stable)
+-- Portability : (portable)
+--
+-- > CVS $Date: 2005/04/11 13:52:50 $ 
+-- > CVS $Author: peb $
+-- > CVS $Revision: 1.1 $
+--
+-- Definitions of multiple context-free grammars
+-----------------------------------------------------------------------------
+
+module GF.Formalism.MCFG where
+
+import GF.Formalism.Utilities
+import GF.Formalism.GCFG
+
+import GF.Infra.Print
+
+------------------------------------------------------------
+-- grammar types
+
+-- | the lables in the linearization record should be in the same
+-- order as specified by the linearization type @[lbl]@
+type MCFGrammar cat name lbl tok = Grammar cat name [lbl] [Lin cat lbl tok]
+type MCFRule    cat name lbl tok = Rule    cat name [lbl] [Lin cat lbl tok]
+
+-- | variants are encoded as several linearizations with the same label
+data Lin        cat      lbl tok = Lin lbl [Symbol (cat, lbl, Int) tok]
+				   deriving (Eq, Ord, Show)
+
+instantiateArgs :: [cat] -> Lin cat' lbl tok -> Lin cat lbl tok
+instantiateArgs args (Lin lbl lin) = Lin lbl (map instSym lin)
+    where instSym = mapSymbol instCat id
+	  instCat (_, lbl, nr) = (args !! nr, lbl, nr)
+
+------------------------------------------------------------
+-- pretty-printing
+
+instance (Print c, Print l, Print t) => Print (Lin c l t) where
+    prt (Lin lbl lin) = prt lbl ++ " = " ++ prtSep " " (map (symbol prArg (show.prt)) lin)
+	where prArg (cat, lbl, nr) = prt cat ++ "@" ++ prt nr ++ prt lbl
+    prtList = prtBefore "\n\t"
+
+
+
-- 
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