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(* M2FileName.mod construct file names.
Copyright (C) 2001-2025 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Modula-2 is distributed in the hope that it will be useful, but
WITHOUT 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
along with GNU Modula-2; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. *)
IMPLEMENTATION MODULE M2FileName ;
FROM ASCII IMPORT nul ;
FROM DynamicStrings IMPORT InitString, Mark, Slice, Dup, ConCatChar, ConCat, Length, Equal, Index ;
CONST
MaxFileName = 0 ; (* zero means no limits *)
MaxStemName = 0 ;
Directory = '/' ;
(*
currently there are no limits on filename length, this may
be incorrect on some systems.
*)
(*
CalculateFileName - calculates and returns a new string filename given a module
and an extension. String, Extension, is concatenated onto
Module and thus it is safe to `Mark' the extension for garbage
collection.
*)
PROCEDURE CalculateFileName (Module, Extension: String) : String ;
BEGIN
IF MaxFileName=0
THEN
RETURN ConCat (Slice (Module, 0, MaxFileName), Extension)
ELSE
RETURN ConCat (Slice (Module, 0, MaxFileName-Length (Extension)), Extension)
END
END CalculateFileName ;
(*
CalculateStemName - calculates the stem name for given a module.
This name length will be operating system and
compiler specific.
*)
PROCEDURE CalculateStemName (Module: String) : String ;
BEGIN
RETURN Slice (Module, 0, MaxStemName)
END CalculateStemName ;
(*
ExtractExtension - given a, filename, return the filename without
the extension, Ext.
*)
PROCEDURE ExtractExtension (filename, ext: String) : String ;
BEGIN
IF Equal (ext, Mark (Slice (filename, -Length (ext), 0)))
THEN
RETURN Slice (filename, 0, -Length (ext))
ELSE
RETURN filename
END
END ExtractExtension ;
(*
ExtractModule - given a, filename, return the module name including any
extension. A new string is returned.
*)
PROCEDURE ExtractModule (filename: String) : String ;
VAR
i: INTEGER ;
BEGIN
i := Index (filename, Directory, 0) ;
IF i=-1
THEN
RETURN Dup (filename)
ELSE
RETURN Slice (filename, i+1, 0)
END
END ExtractModule ;
END M2FileName.
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