modules for embedded GF

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diff --git a/src/GF/Embed/EmbedAPI.hs b/src/GF/Embed/EmbedAPI.hs
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+----------------------------------------------------------------------
+-- |
+-- Module      : EmbedAPI
+-- Maintainer  : Aarne Ranta
+-- Stability   : (stable)
+-- Portability : (portable)
+--
+-- > CVS $Date: 
+-- > CVS $Author: 
+-- > CVS $Revision: 
+--
+-- Reduced Application Programmer's Interface to GF, meant for
+-- embedded GF systems. AR 10/5/2005
+-----------------------------------------------------------------------------
+
+module GF.Embed.EmbedAPI where
+
+import GF.Compile.ShellState (ShellState,grammar2shellState,canModules,stateGrammarOfLang,abstract,grammar)
+import GF.UseGrammar.Linear (linTree2string)
+import GF.Embed.EmbedParsing (parseString)
+import GF.Canon.CMacros (noMark)
+import GF.Grammar.Grammar (Trm)
+import GF.Grammar.MMacros (exp2tree)
+import GF.Grammar.Macros (zIdent)
+import GF.Grammar.Values (tree2exp)
+import GF.Grammar.TypeCheck (annotate)
+import GF.Canon.GetGFC (getCanonGrammar)
+import GF.Infra.Modules (emptyMGrammar)
+import GF.CF.CFIdent (string2CFCat)
+import GF.Infra.UseIO
+import GF.Data.Operations
+import GF.Infra.Option (noOptions,useUntokenizer)
+import GF.Infra.Ident (prIdent)
+import GF.Embed.EmbedCustom
+
+-- This API is meant to be used when embedding GF grammars in Haskell 
+-- programs. The embedded system is supposed to use the
+-- .gfcm grammar format, which is first produced by the gf program.
+
+---------------------------------------------------
+-- Interface
+---------------------------------------------------
+
+type MultiGrammar = ShellState
+type Language     = String
+type Category     = String
+type Tree         = Trm
+
+file2grammar :: FilePath -> IO MultiGrammar
+linearize    :: MultiGrammar -> Language -> Tree -> String
+parse        :: MultiGrammar -> Language -> Category -> String -> [Tree]
+
+---------------------------------------------------
+-- Implementation
+---------------------------------------------------
+
+file2grammar file = do
+  can <- useIOE (error "cannot parse grammar file") $ getCanonGrammar file
+  return $ errVal (error "cannot build multigrammar") $ grammar2shellState noOptions (can,emptyMGrammar) 
+
+linearize mgr lang = 
+  untok .
+  linTree2string noMark (canModules mgr) (zIdent lang) . 
+  errVal (error "illegal tree") . 
+  annotate gr
+ where
+   gr    = grammar sgr
+   sgr   = stateGrammarOfLang mgr (zIdent lang)
+   untok = customOrDefault noOptions useUntokenizer customUntokenizer sgr
+
+parse mgr lang cat = 
+  map tree2exp . 
+  errVal [] . 
+  parseString noOptions sgr cfcat
+ where
+   sgr   = stateGrammarOfLang mgr (zIdent lang)
+   cfcat = string2CFCat abs cat
+   abs   = maybe (error "no abstract syntax") prIdent $ abstract mgr