124 lines
4.8 KiB
Standard ML
124 lines
4.8 KiB
Standard ML
(*****************************************************************************
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* su4sml GCG - Generic Code Generator
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*
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* gcg_core.sml - implements functor GCG_Core
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* transcribes a su4sml model according to a template tree
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* into code specific to a target language cartridge C
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* Copyright (C) 2005 Raphael Eidenbenz <eraphael@student.ethz.ch>
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*
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* This file is part of su4sml-gcg.
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*
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* su4sml is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* su4sml is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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******************************************************************************)
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signature GCG =
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sig
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val writeLine : string -> unit
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val generate : Rep.Model -> string -> unit
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end
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functor GCG_Core (C: CARTRIDGE): GCG =
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struct
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val curFile = ref ""
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val out = ref TextIO.stdOut
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fun closeFile ()= if (!curFile = "")
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then ()
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else (TextIO.closeOut (!out);
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print ((!curFile)^" ... done\n");
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curFile := "")
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fun openFile file = (closeFile ();
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print ("opening "^file^"...\n");
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Gcg_Helper.assureDir file;
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out := (TextIO.openOut file);
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curFile := file
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)
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fun initOut () = (out := TextIO.stdOut;
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curFile := "")
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fun writeLine s = TextIO.output (!out,s)
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fun eval s = (print ("<eval>\n");
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CompilerExt.eval true s;
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print "<>\n")
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(** applies f to every other element in l starting with the second
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*)
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fun map2EveryOther f [] = []
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| map2EveryOther f [a] = [a]
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| map2EveryOther f (a::b::z) = a::(f b)::(map2EveryOther f z)
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fun substituteVars e s = let val tkl = (Gcg_Helper.joinEscapeSplitted "$") (Gcg_Helper.fieldSplit s #"$")
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in
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String.concat (map2EveryOther (C.lookup e) tkl)
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end
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(** traverses a templateParseTree and executes the given instructions *)
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fun write env (Tpl_Parser.RootNode(l)) = List.app (write env) l
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| write env (Tpl_Parser.OpenFileLeaf(file)) = openFile (substituteVars env file)
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| write env (Tpl_Parser.EvalLeaf(l)) = let fun collectEval [] = ""
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| collectEval ((Tpl_Parser.TextLeaf(expr))::t) = expr^"\n"^(collectEval t)
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| collectEval _ =
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Gcg_Helper.gcg_error "eval failed: TextLeaf expected in gcg_core.write."
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in
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eval (substituteVars env (collectEval l))
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end
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| write env (Tpl_Parser.TextLeaf(s)) = writeLine (substituteVars env s)
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| write env (Tpl_Parser.IfNode(cond,l))
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= let (*val list_of_environments = C.foreach listType env
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fun write_children e = List.app (fn tree => write e tree) children
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*)
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fun writeThen _ [] = ()
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| writeThen _ [Tpl_Parser.ElseNode(_)]= ()
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| writeThen e (h::t) = (write e h ;writeThen e t)
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in
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if (C.test env cond)
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then writeThen env l
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else (case (List.last l) of nd as (Tpl_Parser.ElseNode(_)) => write env nd
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| _ => () )
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end
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| write env (Tpl_Parser.ElseNode(l)) = List.app (write env) l
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| write env (Tpl_Parser.ForEachNode(listType,children))
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= let val list_of_environments = C.foreach listType env
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fun write_children e = List.app (fn tree => write e tree) children
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in
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List.app (fn e => write_children e) list_of_environments
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end
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(** generate code according to the given template file for the given model *)
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fun generate model template
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= let val env = C.initEnv model
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val tree = Tpl_Parser.parse template
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in
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(initOut();
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(*printTTree tree;*)
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write env tree;
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closeFile () )
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handle GCG_Error => (closeFile(); raise GCG_Error)
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end
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end
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