Critical Mass Modula-3: m3tk/src/sem/M3CBrand.m3

m3tk/src/sem/M3CBrand.m3

MODULE M3CBrand;

************************************************************************* 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 Text, TextExtras, Fmt;
IMPORT AST, M3AST_AS, M3AST_SM;

IMPORT M3AST_LX_F, M3AST_AS_F, M3AST_SM_F;

IMPORT ASTWalk;
IMPORT M3CId, M3CLiteral, M3CSrcPos;
IMPORT M3CBackEnd;

REVEAL
  Handle = BRANDED REF RECORD
    unitId: M3AST_AS.UNIT_ID;
    unitBody: M3AST_AS.Block;
    block: M3AST_AS.Block;
    typeDecl: M3AST_AS.Concrete_decl;
    revelation: M3AST_AS.Concrete_reveal;
    count := 0;
  END;

PROCEDURE NewHandle(
    unit: M3AST_AS.UNIT_NORMAL;
    block: M3AST_AS.Block := NIL;
    typeDecl: M3AST_AS.Concrete_decl := NIL;
    revelation: M3AST_AS.Concrete_reveal := NIL)
    : Handle
    RAISES {}=
  BEGIN
    RETURN NEW(Handle, unitId := unit.as_id, unitBody := unit.as_block,
        block := block, typeDecl := typeDecl, revelation := revelation);
  END NewHandle;

<*INLINE*> PROCEDURE UnitSep(unitId: M3AST_AS.UNIT_ID): Text.T RAISES {}=
  BEGIN
    IF ISTYPE(unitId, M3AST_AS.Module_id) THEN
      RETURN ",";
    ELSE
      RETURN ".";
    END;
  END UnitSep;

<*INLINE*> PROCEDURE UnitText(unitId: M3AST_AS.UNIT_ID): Text.T RAISES {}=
  BEGIN
    IF unitId.lx_symrep = NIL THEN RETURN "" END;
    RETURN M3CId.ToText(unitId.lx_symrep);
  END UnitText;

PROCEDURE UnnamedBrand(
    unitId: M3AST_AS.UNIT_ID;
    srcPos: M3CSrcPos.T)
    : M3AST_SM.Exp_value
    RAISES {}=
  VAR
    unitSep := UnitSep(unitId);
    pos: CARDINAL;
    line := M3CSrcPos.Unpack(srcPos, pos);
  BEGIN
    RETURN TextToExp_value(TextExtras.Join(
        UnitText(unitId), unitSep, Fmt.Int(line), unitSep, Fmt.Int(pos)));
  END UnnamedBrand;

PROCEDURE NamedBrand(
    unitId: M3AST_AS.UNIT_ID;
    typeId: M3AST_AS.Type_id;
    VAR count: INTEGER)
    : M3AST_SM.Exp_value
    RAISES {}=
  VAR
    unitSep := UnitSep(unitId);
    unitText := UnitText(unitId);
    typeText := M3CId.ToText(typeId.lx_symrep);
    result: Text.T;
  BEGIN
    IF count = 0 THEN
      result := TextExtras.Join(unitText, unitSep, typeText);
    ELSE
      result :=
          TextExtras.Join(unitText, unitSep, typeText, unitSep, Fmt.Int(count));
    END;
    INC(count);
    RETURN TextToExp_value(result);
  END NamedBrand;

PROCEDURE TextToExp_value(t: TEXT): M3AST_SM.Exp_value RAISES {}=
  VAR
    er: M3AST_SM.Exp_value;
    text_lit: M3AST_AS.Text_literal := NEW(M3AST_AS.Text_literal).init();
  BEGIN
    text_lit.lx_litrep := M3CLiteral.Enter(
      TextExtras.Join("\"", t, "\""));
    EVAL M3CBackEnd.LiteralValue(text_lit, er);
    RETURN er
  END TextToExp_value;

PROCEDURE Set(h: Handle; n: AST.NODE; vm: ASTWalk.VisitMode) RAISES {}=
  BEGIN
    TYPECASE n OF
    | M3AST_AS.Block(block) =>
        IF vm = ASTWalk.VisitMode.Entry THEN
          IF block # h.unitBody AND h.block = NIL THEN h.block := block END;
        ELSE
          IF block = h.block THEN h.block := NIL END;
        END;
    | M3AST_AS.Concrete_decl(typeDecl) =>
        IF vm = ASTWalk.VisitMode.Entry THEN
          h.count := 0;
          h.typeDecl := typeDecl;
        ELSE
          h.typeDecl := NIL;
        END;
    | M3AST_AS.Concrete_reveal(revelation) =>
        IF vm = ASTWalk.VisitMode.Entry THEN
          h.count := 0;
          h.revelation := revelation;
        ELSE
          h.revelation := NIL;
        END;
    | M3AST_AS.Brand(brand) =>
        IF vm = ASTWalk.VisitMode.Entry THEN
          IF brand.as_exp = NIL THEN
            IF h.typeDecl # NIL AND h.block = NIL THEN
              (* Top level type declaration *)
              IF h.typeDecl.as_id.lx_symrep # NIL THEN
                brand.sm_brand :=
                    NamedBrand(h.unitId, h.typeDecl.as_id, h.count);
              END;
            ELSIF h.revelation # NIL THEN
              (* Revelation (bound to be top level) *)
              TYPECASE h.revelation.as_qual_id.as_id.sm_def OF
              | NULL =>
              | M3AST_AS.Type_id(typeId) =>
                  brand.sm_brand := NamedBrand(h.unitId, typeId, h.count);
              ELSE
              END;
            ELSE
              brand.sm_brand := UnnamedBrand(h.unitId, brand.lx_srcpos);
            END; (* if *)
          ELSE
            brand.sm_brand := brand.as_exp.sm_exp_value;
          END; (* if *)
        END;
    ELSE
    END; (* typecase *)
  END Set;

BEGIN

END M3CBrand.