Critical Mass Modula-3: m3tk/src/sem/M3CImportS.m3

m3tk/src/sem/M3CImportS.m3

MODULE M3CImportS;

************************************************************************* Copyright (C) Olivetti 1989 All Rights reserved Use and copy of this software and preparation of derivative works based upon this software are permitted to any person, provided this same copyright notice and the following Olivetti warranty disclaimer are included in any copy of the software or any modification thereof or derivative work therefrom made by any person. This software is made available AS IS and Olivetti disclaims all warranties with respect to this software, whether expressed or implied under any law, including all implied warranties of merchantibility and fitness for any purpose. In no event shall Olivetti be liable for any damages whatsoever resulting from loss of use, data or profits or otherwise arising out of or in connection with the use or performance of this software. *************************************************************************

IMPORT M3AST, M3AST_AS;

IMPORT M3AST_LX_F, M3AST_AS_F, M3AST_SM_F;

IMPORT SeqM3AST_AS_Used_interface_id, SeqM3AST_AS_IMPORTED;

IMPORT M3ASTNext;
IMPORT M3Context, M3CSrcPos; (* for Standard *)

PROCEDURE Set(an: M3AST.NODE) RAISES {}=
  VAR
    unit: M3AST_AS.UNIT_NORMAL;
    m: M3AST_AS.Module;
    used_intf_id: M3AST_AS.Used_interface_id;
    iter: SeqM3AST_AS_Used_interface_id.Iter;
  BEGIN
    TYPECASE an OF
    | M3AST_AS.Module(module) =>
        m := module;
        unit := module;
    | M3AST_AS.Interface(interface) =>
        m := NIL;
        unit := interface;
    ELSE
      RETURN
    END;

    (* Everybody imports Standard - ugh not next time *)
    AddStandard(unit);

    IF m # NIL THEN
      iter := SeqM3AST_AS_Used_interface_id.NewIter(m.sm_export_s);
      WHILE SeqM3AST_AS_Used_interface_id.Next(iter, used_intf_id) DO
        AddInterface(unit, used_intf_id);
      END; (* while *)
    END; (* if *)
    AddImports(unit, unit.as_import_s);
  END Set;

PROCEDURE AddInterface(
    unit: M3AST_AS.UNIT_NORMAL;
    used_intf_id: M3AST_AS.Used_interface_id)
    RAISES {}=
  VAR
    id := used_intf_id.lx_symrep;
    xused_intf_id: M3AST_AS.Used_interface_id;
    iter := SeqM3AST_AS_Used_interface_id.NewIter(unit.sm_import_s);
  BEGIN
    (* Don't add errant ids *)
    IF id = NIL THEN RETURN END;
    (* sm_import_s is really a set, no duplicates, no self *)
    WHILE SeqM3AST_AS_Used_interface_id.Next(iter, xused_intf_id) DO
      IF id = xused_intf_id.lx_symrep THEN
        RETURN
      END; (* if *)
    END; (* while *)
    (* new; add it and everything it imports, but be graceful about
    unresolved names. Do not add self *)
    IF used_intf_id.sm_def # unit.as_id THEN
      SeqM3AST_AS_Used_interface_id.AddRear(unit.sm_import_s, used_intf_id);
      IF used_intf_id.sm_def # NIL THEN
        VAR spec := NARROW(used_intf_id.sm_def, M3AST_AS.UNIT_ID).sm_spec;
        BEGIN
          IF spec # NIL THEN
            TYPECASE spec OF
            | M3AST_AS.UNIT_NORMAL(unit_normal) =>
                AddImports(unit, unit_normal.as_import_s);
            ELSE (* error elsewhere, (import of generic) *)
            END;
          END;
        END;
      END; (* if *)
    END; (* if *)
  END AddInterface;

PROCEDURE AddStandard(unit: M3AST_AS.UNIT_NORMAL) RAISES {}=
  VAR
    cu: M3AST_AS.Compilation_Unit;
    std_id: M3AST_AS.Interface_id;
    used_intf_id: M3AST_AS.Used_interface_id;
  BEGIN
    cu := M3Context.Standard();
    IF unit = cu.as_root THEN RETURN END; (* this is Standard *)
    std_id := cu.as_root.as_id;
    used_intf_id := NEW(M3AST_AS.Used_interface_id).init();
    used_intf_id.lx_symrep := std_id.lx_symrep;
    used_intf_id.sm_def := std_id;
    used_intf_id.lx_srcpos := M3CSrcPos.Null;
    AddInterface(unit, used_intf_id);
  END AddStandard;

PROCEDURE AddImports(
    unit: M3AST_AS.UNIT_NORMAL;
    seqImported: SeqM3AST_AS_IMPORTED.T)
    RAISES {}=
  VAR
    iter : M3ASTNext.IterImportedId;
    used_interface_id: M3AST_AS.Used_interface_id;
  BEGIN
    iter := M3ASTNext.NewIterImportedId(seqImported);
    WHILE M3ASTNext.ImportedId(iter, used_interface_id) DO
      (* The case "IMPORT I AS J; FROM J IMPORT ..." will cause
         "used_interface_id" to bind to an "Interface_AS_id", which
         doesnt provide any new information, so we ignore it here.
      *)
      TYPECASE used_interface_id.sm_def OF
      | NULL =>
      | M3AST_AS.Interface_AS_id =>
      | M3AST_AS.Interface_id =>
          AddInterface(unit, used_interface_id);
      ELSE
      END; (* typecase *)
    END; (* while *)
  END AddImports;

BEGIN
END M3CImportS.

interface M3AST is in: