gcc/ada/par-ch8.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              P A R . C H 8                               --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                                                                          --
  10 --          Copyright (C) 1992-2001 Free Software Foundation, Inc.          --
  11 --                                                                          --
  12 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  13 -- terms of the  GNU General Public License as published  by the Free Soft- --
  14 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  15 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  16 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  17 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  18 -- for  more details.  You should have  received  a copy of the GNU General --
  19 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  20 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  21 -- MA 02111-1307, USA.                                                      --
  22 --                                                                          --
  23 -- GNAT was originally developed  by the GNAT team at  New York University. --
  24 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  25 --                                                                          --
  26 ------------------------------------------------------------------------------
  27
  28 pragma Style_Checks (All_Checks);
  29 --  Turn off subprogram body ordering check. Subprograms are in order
  30 --  by RM section rather than alphabetical
  31
  32 separate (Par)
  33 package body Ch8 is
  34
  35    -----------------------
  36    -- Local Subprograms --
  37    -----------------------
  38
  39    function P_Use_Package_Clause                           return Node_Id;
  40    function P_Use_Type_Clause                              return Node_Id;
  41
  42    ---------------------
  43    -- 8.4  Use Clause --
  44    ---------------------
  45
  46    --  USE_CLAUSE ::= USE_PACKAGE_CLAUSE | USE_TYPE_CLAUSE
  47
  48    --  The caller has checked that the initial token is USE
  49
  50    --  Error recovery: cannot raise Error_Resync
  51
  52    function P_Use_Clause return Node_Id is
  53    begin
  54       Scan; -- past USE
  55
  56       if Token = Tok_Type then
  57          return P_Use_Type_Clause;
  58
  59       else
  60          return P_Use_Package_Clause;
  61       end if;
  62    end P_Use_Clause;
  63
  64    -----------------------------
  65    -- 8.4  Use Package Clause --
  66    -----------------------------
  67
  68    --  USE_PACKAGE_CLAUSE ::= use package_NAME {, package_NAME};
  69
  70    --  The caller has scanned out the USE keyword
  71
  72    --  Error recovery: cannot raise Error_Resync
  73
  74    function P_Use_Package_Clause return Node_Id is
  75       Use_Node : Node_Id;
  76
  77    begin
  78       Use_Node := New_Node (N_Use_Package_Clause, Prev_Token_Ptr);
  79       Set_Names (Use_Node, New_List);
  80
  81       if Token = Tok_Package then
  82          Error_Msg_SC ("PACKAGE should not appear here");
  83          Scan; -- past PACKAGE
  84       end if;
  85
  86       loop
  87          Append (P_Qualified_Simple_Name, Names (Use_Node));
  88          exit when Token /= Tok_Comma;
  89          Scan; -- past comma
  90       end loop;
  91
  92       TF_Semicolon;
  93       return Use_Node;
  94    end P_Use_Package_Clause;
  95
  96    --------------------------
  97    -- 8.4  Use Type Clause --
  98    --------------------------
  99
 100    --  USE_TYPE_CLAUSE ::= use type SUBTYPE_MARK {, SUBTYPE_MARK};
 101
 102    --  The caller has checked that the initial token is USE, scanned it out
 103    --  and that the current token is TYPE.
 104
 105    --  Error recovery: cannot raise Error_Resync
 106
 107    function P_Use_Type_Clause return Node_Id is
 108       Use_Node : Node_Id;
 109
 110    begin
 111       Use_Node := New_Node (N_Use_Type_Clause, Prev_Token_Ptr);
 112       Set_Subtype_Marks (Use_Node, New_List);
 113
 114       if Ada_83 then
 115          Error_Msg_SC ("(Ada 83) use type not allowed!");
 116       end if;
 117
 118       Scan; -- past TYPE
 119
 120       loop
 121          Append (P_Subtype_Mark, Subtype_Marks (Use_Node));
 122          No_Constraint;
 123          exit when Token /= Tok_Comma;
 124          Scan; -- past comma
 125       end loop;
 126
 127       TF_Semicolon;
 128       return Use_Node;
 129    end P_Use_Type_Clause;
 130
 131    -------------------------------
 132    -- 8.5  Renaming Declaration --
 133    -------------------------------
 134
 135    --  Object renaming declarations and exception renaming declarations
 136    --  are parsed by P_Identifier_Declaration (3.3.1)
 137
 138    --  Subprogram renaming declarations are parsed by P_Subprogram (6.1)
 139
 140    --  Package renaming declarations are parsed by P_Package (7.1)
 141
 142    --  Generic renaming declarations are parsed by P_Generic (12.1)
 143
 144    ----------------------------------------
 145    -- 8.5.1  Object Renaming Declaration --
 146    ----------------------------------------
 147
 148    --  Parsed by P_Identifier_Declarations (3.3.1)
 149
 150    ----------------------------------------
 151    -- 8.5.2  Exception Renaming Declaration --
 152    ----------------------------------------
 153
 154    --  Parsed by P_Identifier_Declarations (3.3.1)
 155
 156    -----------------------------------------
 157    -- 8.5.3  Package Renaming Declaration --
 158    -----------------------------------------
 159
 160    --  Parsed by P_Package (7.1)
 161
 162    --------------------------------------------
 163    -- 8.5.4  Subprogram Renaming Declaration --
 164    --------------------------------------------
 165
 166    --  Parsed by P_Subprogram (6.1)
 167
 168    -----------------------------------------
 169    -- 8.5.2  Generic Renaming Declaration --
 170    -----------------------------------------
 171
 172    --  Parsed by P_Generic (12.1)
 173
 174 end Ch8;