adamc@377: (* Copyright (c) 2008, Adam Chlipala
adamc@377:  * All rights reserved.
adamc@377:  *
adamc@377:  * Redistribution and use in source and binary forms, with or without
adamc@377:  * modification, are permitted provided that the following conditions are met:
adamc@377:  *
adamc@377:  * - Redistributions of source code must retain the above copyright notice,
adamc@377:  *   this list of conditions and the following disclaimer.
adamc@377:  * - Redistributions in binary form must reproduce the above copyright notice,
adamc@377:  *   this list of conditions and the following disclaimer in the documentation
adamc@377:  *   and/or other materials provided with the distribution.
adamc@377:  * - The names of contributors may not be used to endorse or promote products
adamc@377:  *   derived from this software without specific prior written permission.
adamc@377:  *
adamc@377:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@377:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@377:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@377:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@377:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
adamc@377:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@377:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@377:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@377:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@377:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@377:  * POSSIBILITY OF SUCH DAMAGE.
adamc@377:  *)
adamc@377: 
adamc@377: structure PathCheck :> PATH_CHECK = struct
adamc@377: 
adamc@377: open Mono
adamc@377: 
adamc@377: structure E = ErrorMsg
adamc@377: 
adamc@377: structure SS = BinarySetFn(struct
adamc@377:                            type ord_key = string
adamc@377:                            val compare = String.compare
adamc@377:                            end)
adamc@377: 
adamc@377: fun checkDecl ((d, loc), (funcs, rels)) =
adamc@377:     let
adamc@377:         fun doRel s =
adamc@377:             (if SS.member (rels, s) then
adamc@377:                  E.errorAt loc ("Duplicate table/sequence path " ^ s)
adamc@377:              else
adamc@377:                  ();
adamc@377:              (funcs, SS.add (rels, s)))
adamc@377:     in
adamc@377:         case d of
adamc@609:             DExport (_, s, _, _, _) =>
adamc@377:             (if SS.member (funcs, s) then
adamc@377:                  E.errorAt loc ("Duplicate function path " ^ s)
adamc@377:              else
adamc@377:                  ();
adamc@377:              (SS.add (funcs, s), rels))
adamc@377:             
adamc@377:           | DTable (s, _) => doRel s
adamc@377:           | DSequence s => doRel s
adamc@377: 
adamc@377:           | _ => (funcs, rels)
adamc@377:     end
adamc@377: 
adamc@377: fun check ds = ignore (foldl checkDecl (SS.empty, SS.empty) ds)
adamc@377: 
adamc@377: end