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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                              P R J . U T I L                             --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 2001-2008, Free Software Foundation, Inc.         --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

--  Utilities for use in processing project files

package Prj.Util is

   --  ??? throughout this spec, parameters are not well enough documented

   function Executable_Of

     (Project  : Project_Id;

      In_Tree  : Project_Tree_Ref;

      Main     : File_Name_Type;

      Index    : Int;

      Ada_Main : Boolean := True;

      Language : String := "") return File_Name_Type;

   --  Return the value of the attribute Builder'Executable for file Main in

   --  the project Project, if it exists. If there is no attribute Executable

   --  for Main, remove the suffix from Main; then, if the attribute

   --  Executable_Suffix is specified, add this suffix, otherwise add the

   --  standard executable suffix for the platform.

   --  What is Ada_Main???

   --  What is Language???

   procedure Put

     (Into_List  : in out Name_List_Index;

      From_List  : String_List_Id;

      In_Tree    : Project_Tree_Ref;

      Lower_Case : Boolean := False);

   --  Append a name list to a string list

   --  Describe parameters???

   procedure Duplicate

     (This    : in out Name_List_Index;

      In_Tree : Project_Tree_Ref);

   --  Duplicate a name list

   function Value_Of

     (Variable : Variable_Value;

      Default  : String) return String;

   --  Get the value of a single string variable. If Variable is

   --  Nil_Variable_Value, is a string list or is defaulted, return Default.

   function Value_Of

     (Index    : Name_Id;

      In_Array : Array_Element_Id;

      In_Tree  : Project_Tree_Ref) return Name_Id;

   --  Get a single string array component. Returns No_Name if there is no

   --  component Index, if In_Array is null, or if the component is a String

   --  list. Depending on the attribute (only attributes may be associative

   --  arrays) the index may or may not be case sensitive. If the index is not

   --  case sensitive, it is first set to lower case before the search in the

   --  associative array.

   function Value_Of

     (Index                  : Name_Id;

      Src_Index              : Int := 0;

      In_Array               : Array_Element_Id;

      In_Tree                : Project_Tree_Ref;

      Force_Lower_Case_Index : Boolean := False) return Variable_Value;

   --  Get a string array component (single String or String list). Returns

   --  Nil_Variable_Value if no component Index or if In_Array is null.

   --

   --  Depending on the attribute (only attributes may be associative arrays)

   --  the index may or may not be case sensitive. If the index is not case

   --  sensitive, it is first set to lower case before the search in the

   --  associative array.

   function Value_Of

     (Name                    : Name_Id;

      Index                   : Int := 0;

      Attribute_Or_Array_Name : Name_Id;

      In_Package              : Package_Id;

      In_Tree                 : Project_Tree_Ref;

      Force_Lower_Case_Index  : Boolean := False) return Variable_Value;

   --  In a specific package,

   --   - if there exists an array Attribute_Or_Array_Name with an index Name,

   --     returns the corresponding component (depending on the attribute, the

   --     index may or may not be case sensitive, see previous function),

   --   - otherwise if there is a single attribute Attribute_Or_Array_Name,

   --     returns this attribute,

   --   - otherwise, returns Nil_Variable_Value.

   --  If In_Package is null, returns Nil_Variable_Value.

   function Value_Of

     (Index     : Name_Id;

      In_Array  : Name_Id;

      In_Arrays : Array_Id;

      In_Tree   : Project_Tree_Ref) return Name_Id;

   --  Get a string array component in an array of an array list. Returns

   --  No_Name if there is no component Index, if In_Arrays is null, if

   --  In_Array is not found in In_Arrays or if the component is a String list.

   function Value_Of

     (Name      : Name_Id;

      In_Arrays : Array_Id;

      In_Tree   : Project_Tree_Ref) return Array_Element_Id;

   --  Returns a specified array in an array list. Returns No_Array_Element

   --  if In_Arrays is null or if Name is not the name of an array in

   --  In_Arrays. The caller must ensure that Name is in lower case.

   function Value_Of

     (Name        : Name_Id;

      In_Packages : Package_Id;

      In_Tree     : Project_Tree_Ref) return Package_Id;

   --  Returns a specified package in a package list. Returns No_Package if

   --  In_Packages is null or if Name is not the name of a package in

   --  Package_List. The caller must ensure that Name is in lower case.

   function Value_Of

     (Variable_Name : Name_Id;

      In_Variables  : Variable_Id;

      In_Tree       : Project_Tree_Ref) return Variable_Value;

   --  Returns a specified variable in a variable list. Returns null if

   --  In_Variables is null or if Variable_Name is not the name of a

   --  variable in In_Variables. Caller must ensure that Name is lower case.

   procedure Write_Str

     (S          : String;

      Max_Length : Positive;

      Separator  : Character);

   --  Output string S using Output.Write_Str. If S is too long to fit in

   --  one line of Max_Length, cut it in several lines, using Separator as

   --  the last character of each line, if possible.

   type Text_File is limited private;

   --  Represents a text file (default is invalid text file)

   function Is_Valid (File : Text_File) return Boolean;

   --  Returns True if File designates an open text file that has not yet been

   --  closed.

   procedure Open (File : out Text_File; Name : String);

   --  Open a text file to read (file is invalid if text file cannot be opened)

   function End_Of_File (File : Text_File) return Boolean;

   --  Returns True if the end of the text file File has been reached. Fails if

   --  File is invalid.

   procedure Get_Line

     (File : Text_File;

      Line : out String;

      Last : out Natural);

   --  Reads a line from an open text file (fails if file is invalid)

   procedure Close (File : in out Text_File);

   --  Close an open text file. File becomes invalid. Fails if File is already

   --  invalid.

private

   type Text_File_Data is record

      FD                  : File_Descriptor := Invalid_FD;

      Buffer              : String (1 .. 1_000);

      Buffer_Len          : Natural;

      Cursor              : Natural := 0;

      End_Of_File_Reached : Boolean := False;

   end record;

   type Text_File is access Text_File_Data;

end Prj.Util;