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) 1992-2007, 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 3,  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 COPYING3.  If not, go to --
  19 -- http://www.gnu.org/licenses for a complete copy of the license.          --
  20 --                                                                          --
  21 -- GNAT was originally developed  by the GNAT team at  New York University. --
  22 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  23 --                                                                          --
  24 ------------------------------------------------------------------------------
  25
  26 pragma Style_Checks (All_Checks);
  27 --  Turn off subprogram body ordering check. Subprograms are in order
  28 --  by RM section rather than alphabetical
  29
  30 separate (Par)
  31 package body Ch8 is
  32
  33    -----------------------
  34    -- Local Subprograms --
  35    -----------------------
  36
  37    function P_Use_Package_Clause                           return Node_Id;
  38    function P_Use_Type_Clause                              return Node_Id;
  39
  40    ---------------------
  41    -- 8.4  Use Clause --
  42    ---------------------
  43
  44    --  USE_CLAUSE ::= USE_PACKAGE_CLAUSE | USE_TYPE_CLAUSE
  45
  46    --  The caller has checked that the initial token is USE
  47
  48    --  Error recovery: cannot raise Error_Resync
  49
  50    function P_Use_Clause return Node_Id is
  51    begin
  52       Scan; -- past USE
  53
  54       if Token = Tok_Type then
  55          return P_Use_Type_Clause;
  56
  57       else
  58          return P_Use_Package_Clause;
  59       end if;
  60    end P_Use_Clause;
  61
  62    -----------------------------
  63    -- 8.4  Use Package Clause --
  64    -----------------------------
  65
  66    --  USE_PACKAGE_CLAUSE ::= use package_NAME {, package_NAME};
  67
  68    --  The caller has scanned out the USE keyword
  69
  70    --  Error recovery: cannot raise Error_Resync
  71
  72    function P_Use_Package_Clause return Node_Id is
  73       Use_Node : Node_Id;
  74
  75    begin
  76       Use_Node := New_Node (N_Use_Package_Clause, Prev_Token_Ptr);
  77       Set_Names (Use_Node, New_List);
  78
  79       if Token = Tok_Package then
  80          Error_Msg_SC ("PACKAGE should not appear here");
  81          Scan; -- past PACKAGE
  82       end if;
  83
  84       loop
  85          Append (P_Qualified_Simple_Name, Names (Use_Node));
  86          exit when Token /= Tok_Comma;
  87          Scan; -- past comma
  88       end loop;
  89
  90       TF_Semicolon;
  91       return Use_Node;
  92    end P_Use_Package_Clause;
  93
  94    --------------------------
  95    -- 8.4  Use Type Clause --
  96    --------------------------
  97
  98    --  USE_TYPE_CLAUSE ::= use type SUBTYPE_MARK {, SUBTYPE_MARK};
  99
 100    --  The caller has checked that the initial token is USE, scanned it out
 101    --  and that the current token is TYPE.
 102
 103    --  Error recovery: cannot raise Error_Resync
 104
 105    function P_Use_Type_Clause return Node_Id is
 106       Use_Node : Node_Id;
 107
 108    begin
 109       Use_Node := New_Node (N_Use_Type_Clause, Prev_Token_Ptr);
 110       Set_Subtype_Marks (Use_Node, New_List);
 111
 112       if Ada_Version = Ada_83 then
 113          Error_Msg_SC ("(Ada 83) use type not allowed!");
 114       end if;
 115
 116       Scan; -- past TYPE
 117
 118       loop
 119          Append (P_Subtype_Mark, Subtype_Marks (Use_Node));
 120          No_Constraint;
 121          exit when Token /= Tok_Comma;
 122          Scan; -- past comma
 123       end loop;
 124
 125       TF_Semicolon;
 126       return Use_Node;
 127    end P_Use_Type_Clause;
 128
 129    -------------------------------
 130    -- 8.5  Renaming Declaration --
 131    -------------------------------
 132
 133    --  Object renaming declarations and exception renaming declarations
 134    --  are parsed by P_Identifier_Declaration (3.3.1)
 135
 136    --  Subprogram renaming declarations are parsed by P_Subprogram (6.1)
 137
 138    --  Package renaming declarations are parsed by P_Package (7.1)
 139
 140    --  Generic renaming declarations are parsed by P_Generic (12.1)
 141
 142    ----------------------------------------
 143    -- 8.5.1  Object Renaming Declaration --
 144    ----------------------------------------
 145
 146    --  Parsed by P_Identifier_Declarations (3.3.1)
 147
 148    ----------------------------------------
 149    -- 8.5.2  Exception Renaming Declaration --
 150    ----------------------------------------
 151
 152    --  Parsed by P_Identifier_Declarations (3.3.1)
 153
 154    -----------------------------------------
 155    -- 8.5.3  Package Renaming Declaration --
 156    -----------------------------------------
 157
 158    --  Parsed by P_Package (7.1)
 159
 160    --------------------------------------------
 161    -- 8.5.4  Subprogram Renaming Declaration --
 162    --------------------------------------------
 163
 164    --  Parsed by P_Subprogram (6.1)
 165
 166    -----------------------------------------
 167    -- 8.5.2  Generic Renaming Declaration --
 168    -----------------------------------------
 169
 170    --  Parsed by P_Generic (12.1)
 171
 172 end Ch8;