gcc/ada/prj-util.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              P R J . U T I L                             --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                                                                          --
  10 --             Copyright (C) 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 --  Utilities when using project files.
  29
  30 with GNAT.OS_Lib; use GNAT.OS_Lib;
  31 with Types;       use Types;
  32
  33 package Prj.Util is
  34
  35    function Value_Of
  36      (Variable : Variable_Value;
  37       Default  : String)
  38       return     String;
  39    --  Get the value of a single string variable. If Variable is
  40    --  Nil_Variable_Value, is a string list or is defaulted, return Default.
  41
  42    function Value_Of
  43      (Index    : Name_Id;
  44       In_Array : Array_Element_Id)
  45       return     Name_Id;
  46    --  Get a single string array component.
  47    --  Returns No_Name if there is no component Index (case sensitive),
  48    --  if In_Array is null, or if the component is a String list.
  49
  50    function Value_Of
  51      (Index    : Name_Id;
  52       In_Array : Array_Element_Id)
  53       return     Variable_Value;
  54    --  Get a string array component (single String or String list).
  55    --  Returns Nil_Variable_Value if there is no component Index
  56    --  (case sensitive), or if In_Array is null.
  57
  58    function Value_Of
  59      (Name                    : Name_Id;
  60       Attribute_Or_Array_Name : Name_Id;
  61       In_Package              : Package_Id)
  62       return                    Variable_Value;
  63    --  In a specific package,
  64    --   - if there exists an array Variable_Or_Array_Name with an index
  65    --     Name, returns the corresponding component,
  66    --   - otherwise if there is a attribute Attribute_Or_Array_Name,
  67    --     returns this attribute,
  68    --   - otherwise, returns Nil_Variable_Value.
  69    --  If In_Package is null, returns Nil_Variable_Value.
  70
  71    function Value_Of
  72      (Index     : Name_Id;
  73       In_Array  : Name_Id;
  74       In_Arrays : Array_Id)
  75       return      Name_Id;
  76    --  Get a string array component in an array of an array list.
  77    --  Returns No_Name if there is no component Index (case sensitive),
  78    --  if In_Arrays is null, if In_Array is not found in In_Arrays,
  79    --  or if the component is a String list.
  80
  81    function Value_Of
  82      (Name      : Name_Id;
  83       In_Arrays : Array_Id)
  84       return      Array_Element_Id;
  85    --  Returns a specified array in an array list. Returns No_Array_Element
  86    --  if In_Arrays is null or if Name is not the name of an array in
  87    --  In_Arrays. The caller must ensure that Name is in lower case.
  88
  89    function Value_Of
  90      (Name        : Name_Id;
  91       In_Packages : Package_Id)
  92       return        Package_Id;
  93    --  Returns a specified package in a package list. Returns No_Package
  94    --  if In_Packages is null or if Name is not the name of a package in
  95    --  Package_List. The caller must ensure that Name is in lower case.
  96
  97    function Value_Of
  98      (Variable_Name : Name_Id;
  99       In_Variables  : Variable_Id)
 100       return          Variable_Value;
 101    --  Returns a specified variable in a variable list. Returns null if
 102    --  In_Variables is null or if Variable_Name is not the name of a
 103    --  variable in In_Variables. Caller must ensure that Name is lower case.
 104
 105    procedure Write_Str
 106      (S          : String;
 107       Max_Length : Positive;
 108       Separator  : Character);
 109    --  Output string S using Output.Write_Str. If S is too long to fit in
 110    --  one line of Max_Length, cut it in several lines, using Separator as
 111    --  the last character of each line, if possible.
 112
 113    type Text_File is limited private;
 114    --  Represents a text file. Default is invalid text file.
 115
 116    function Is_Valid (File : Text_File) return Boolean;
 117    --  Returns True if File designates an open text file that
 118    --  has not yet been closed.
 119
 120    procedure Open (File : out Text_File; Name : String);
 121    --  Open a text file. If this procedure fails, File is invalid.
 122
 123    function End_Of_File (File : Text_File) return Boolean;
 124    --  Returns True if the end of the text file File has been
 125    --  reached. Fails if File is invalid.
 126
 127    procedure Get_Line
 128      (File : Text_File;
 129       Line : out String;
 130       Last : out Natural);
 131    --  Reads a line from an open text file. Fails if File is invalid.
 132
 133    procedure Close (File : in out Text_File);
 134    --  Close an open text file. File becomes invalid.
 135    --  Fails if File is already invalid.
 136
 137 private
 138
 139    type Text_File_Data is record
 140       FD                  : File_Descriptor := Invalid_FD;
 141       Buffer              : String (1 .. 1_000);
 142       Buffer_Len          : Natural;
 143       Cursor              : Natural := 0;
 144       End_Of_File_Reached : Boolean := False;
 145    end record;
 146
 147    type Text_File is access Text_File_Data;
 148
 149 end Prj.Util;