gcc/ada/prj-ext.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              P R J . E X T                               --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2000-2009, 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 --  Subprograms to set, get and cache external references, to be used as
  27 --  External functions in project files.
  28
  29 with Prj.Tree;
  30
  31 package Prj.Ext is
  32
  33    ------------------
  34    -- Project Path --
  35    ------------------
  36
  37    procedure Add_Search_Project_Directory
  38      (Tree : Prj.Tree.Project_Node_Tree_Ref;
  39       Path : String);
  40    --  Add a directory to the project path. Directories added with this
  41    --  procedure are added in order after the current directory and before
  42    --  the path given by the environment variable GPR_PROJECT_PATH. A value
  43    --  of "-" will remove the default project directory from the project path.
  44    --
  45    --  Calls to this subprogram must be performed before the first call to
  46    --  Project_Path below, or PATH will be added at the end of the search
  47    --  path.
  48
  49    function Project_Path (Tree : Prj.Tree.Project_Node_Tree_Ref) return String;
  50    --  Return the current value of the project path, either the value set
  51    --  during elaboration of the package or, if procedure Set_Project_Path has
  52    --  been called, the value set by the last call to Set_Project_Path.
  53
  54    procedure Set_Project_Path
  55      (Tree     : Prj.Tree.Project_Node_Tree_Ref;
  56       New_Path : String);
  57    --  Give a new value to the project path. The new value New_Path should
  58    --  always start with the current directory (".") and the path separators
  59    --  should be the correct ones for the platform.
  60
  61    -------------------------
  62    -- External References --
  63    -------------------------
  64
  65    --  External references influence the way a project tree is processed (in
  66    --  particular they provide the values for the typed string variables that
  67    --  are then used in case constructions).
  68
  69    --  External references are project-tree specific, so that when multiple
  70    --  trees are loaded in parallel we can have different scenarios (or even
  71    --  load the same tree twice and see different views of it).
  72
  73    procedure Add
  74      (Tree          : Prj.Tree.Project_Node_Tree_Ref;
  75       External_Name : String;
  76       Value         : String);
  77    --  Add an external reference (or modify an existing one)
  78
  79    function Value_Of
  80      (Tree          : Prj.Tree.Project_Node_Tree_Ref;
  81       External_Name : Name_Id;
  82       With_Default  : Name_Id := No_Name)
  83       return          Name_Id;
  84    --  Get the value of an external reference, and cache it for future uses
  85
  86    function Check
  87      (Tree        : Prj.Tree.Project_Node_Tree_Ref;
  88       Declaration : String) return Boolean;
  89    --  Check that an external declaration <external>=<value> is correct.
  90    --  If it is correct, the external reference is Added.
  91
  92    procedure Reset (Tree : Prj.Tree.Project_Node_Tree_Ref);
  93    --  Clear the internal data structure that stores the external references
  94    --  and free any allocated memory.
  95
  96 end Prj.Ext;