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 --          Copyright (C) 1992-2004 Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- GNAT was originally developed  by the GNAT team at  New York University. --
  23 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  24 --                                                                          --
  25 ------------------------------------------------------------------------------
  26
  27 pragma Style_Checks (All_Checks);
  28 --  Turn off subprogram body ordering check. Subprograms are in order
  29 --  by RM section rather than alphabetical
  30
  31 separate (Par)
  32 package body Ch8 is
  33
  34    -----------------------
  35    -- Local Subprograms --
  36    -----------------------
  37
  38    function P_Use_Package_Clause                           return Node_Id;
  39    function P_Use_Type_Clause                              return Node_Id;
  40
  41    ---------------------
  42    -- 8.4  Use Clause --
  43    ---------------------
  44
  45    --  USE_CLAUSE ::= USE_PACKAGE_CLAUSE | USE_TYPE_CLAUSE
  46
  47    --  The caller has checked that the initial token is USE
  48
  49    --  Error recovery: cannot raise Error_Resync
  50
  51    function P_Use_Clause return Node_Id is
  52    begin
  53       Scan; -- past USE
  54
  55       if Token = Tok_Type then
  56          return P_Use_Type_Clause;
  57
  58       else
  59          return P_Use_Package_Clause;
  60       end if;
  61    end P_Use_Clause;
  62
  63    -----------------------------
  64    -- 8.4  Use Package Clause --
  65    -----------------------------
  66
  67    --  USE_PACKAGE_CLAUSE ::= use package_NAME {, package_NAME};
  68
  69    --  The caller has scanned out the USE keyword
  70
  71    --  Error recovery: cannot raise Error_Resync
  72
  73    function P_Use_Package_Clause return Node_Id is
  74       Use_Node : Node_Id;
  75
  76    begin
  77       Use_Node := New_Node (N_Use_Package_Clause, Prev_Token_Ptr);
  78       Set_Names (Use_Node, New_List);
  79
  80       if Token = Tok_Package then
  81          Error_Msg_SC ("PACKAGE should not appear here");
  82          Scan; -- past PACKAGE
  83       end if;
  84
  85       loop
  86          Append (P_Qualified_Simple_Name, Names (Use_Node));
  87          exit when Token /= Tok_Comma;
  88          Scan; -- past comma
  89       end loop;
  90
  91       TF_Semicolon;
  92       return Use_Node;
  93    end P_Use_Package_Clause;
  94
  95    --------------------------
  96    -- 8.4  Use Type Clause --
  97    --------------------------
  98
  99    --  USE_TYPE_CLAUSE ::= use type SUBTYPE_MARK {, SUBTYPE_MARK};
 100
 101    --  The caller has checked that the initial token is USE, scanned it out
 102    --  and that the current token is TYPE.
 103
 104    --  Error recovery: cannot raise Error_Resync
 105
 106    function P_Use_Type_Clause return Node_Id is
 107       Use_Node : Node_Id;
 108
 109    begin
 110       Use_Node := New_Node (N_Use_Type_Clause, Prev_Token_Ptr);
 111       Set_Subtype_Marks (Use_Node, New_List);
 112
 113       if Ada_Version = Ada_83 then
 114          Error_Msg_SC ("(Ada 83) use type not allowed!");
 115       end if;
 116
 117       Scan; -- past TYPE
 118
 119       loop
 120          Append (P_Subtype_Mark, Subtype_Marks (Use_Node));
 121          No_Constraint;
 122          exit when Token /= Tok_Comma;
 123          Scan; -- past comma
 124       end loop;
 125
 126       TF_Semicolon;
 127       return Use_Node;
 128    end P_Use_Type_Clause;
 129
 130    -------------------------------
 131    -- 8.5  Renaming Declaration --
 132    -------------------------------
 133
 134    --  Object renaming declarations and exception renaming declarations
 135    --  are parsed by P_Identifier_Declaration (3.3.1)
 136
 137    --  Subprogram renaming declarations are parsed by P_Subprogram (6.1)
 138
 139    --  Package renaming declarations are parsed by P_Package (7.1)
 140
 141    --  Generic renaming declarations are parsed by P_Generic (12.1)
 142
 143    ----------------------------------------
 144    -- 8.5.1  Object Renaming Declaration --
 145    ----------------------------------------
 146
 147    --  Parsed by P_Identifier_Declarations (3.3.1)
 148
 149    ----------------------------------------
 150    -- 8.5.2  Exception Renaming Declaration --
 151    ----------------------------------------
 152
 153    --  Parsed by P_Identifier_Declarations (3.3.1)
 154
 155    -----------------------------------------
 156    -- 8.5.3  Package Renaming Declaration --
 157    -----------------------------------------
 158
 159    --  Parsed by P_Package (7.1)
 160
 161    --------------------------------------------
 162    -- 8.5.4  Subprogram Renaming Declaration --
 163    --------------------------------------------
 164
 165    --  Parsed by P_Subprogram (6.1)
 166
 167    -----------------------------------------
 168    -- 8.5.2  Generic Renaming Declaration --
 169    -----------------------------------------
 170
 171    --  Parsed by P_Generic (12.1)
 172
 173 end Ch8;