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(* M2Search.mod provides a mechanism to search selected directories.
Copyright (C) 2001-2023 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 M2Search ;
FROM M2FileName IMPORT CalculateFileName ;
FROM Assertion IMPORT Assert ;
FROM PathName IMPORT FindNamedPathFile ;
FROM DynamicStrings IMPORT InitString, InitStringChar,
KillString, ConCat, ConCatChar, Index, Slice,
Add, EqualArray, Dup, Mark,
PushAllocation, PopAllocationExemption,
InitStringDB, InitStringCharStarDB,
InitStringCharDB, MultDB, DupDB, SliceDB ;
CONST
GarbageDebugging = FALSE ;
VAR
Def, Mod: String ;
(* Internal garbage collection debugging routines. *)
(*
#define InitString(X) InitStringDB(X, __FILE__, __LINE__)
#define InitStringCharStar(X) InitStringCharStarDB(X, __FILE__, __LINE__)
#define InitStringChar(X) InitStringCharDB(X, __FILE__, __LINE__)
#define Mult(X,Y) MultDB(X, Y, __FILE__, __LINE__)
#define Dup(X) DupDB(X, __FILE__, __LINE__)
#define Slice(X,Y,Z) SliceDB(X, Y, Z, __FILE__, __LINE__)
*)
(*
doDSdbEnter - called when compiled with -fcpp to enable runtime garbage
collection debugging.
*)
(*
PROCEDURE doDSdbEnter ;
BEGIN
PushAllocation
END doDSdbEnter ;
*)
(*
doDSdbExit - called when compiled with -fcpp to enable runtime garbage
collection debugging. The parameter string s is exempt from
garbage collection analysis.
*)
(*
PROCEDURE doDSdbExit (s: String) ;
BEGIN
(* Check to see whether no strings have been lost since the PushAllocation. *)
Assert (PopAllocationExemption (TRUE, s) = s)
END doDSdbExit ;
*)
(*
DSdbEnter - dummy nop entry code which the preprocessor replaces by
doDSsbEnter when debugging garbage collection at runtime.
*)
(*
PROCEDURE DSdbEnter ;
BEGIN
END DSdbEnter ;
*)
(*
DSdbExit - dummy nop exit code which the preprocessor replaces by
doDSsbExit when debugging garbage collection at runtime.
*)
(*
PROCEDURE DSdbExit (s: String) ;
BEGIN
IF GarbageDebugging
THEN
Assert (s # NIL)
END
END DSdbExit ;
*)
(*
#define DSdbEnter doDSdbEnter
#define DSdbExit doDSdbExit
*)
(*
FindSourceFile - attempts to locate the source file FileName.
If a file is found then TRUE is returned otherwise
FALSE is returned.
The parameter FullPath is set indicating the
absolute location of source FileName.
FullPath will be totally overwritten and should
not be initialized by InitString before this function
is called.
FullPath is set to NIL if this function returns FALSE.
FindSourceFile sets FullPath to a new string if successful.
The string FileName is not altered.
*)
PROCEDURE FindSourceFile (FileName: String;
VAR FullPath, named: String) : BOOLEAN ;
BEGIN
FullPath := FindNamedPathFile (FileName, named) ;
RETURN FullPath # NIL
END FindSourceFile ;
(*
FindSourceDefFile - attempts to find the definition module for
a module, Stem. If successful it returns
the full path and returns TRUE. If unsuccessful
then FALSE is returned and FullPath is set to NIL.
*)
PROCEDURE FindSourceDefFile (Stem: String; VAR FullPath, named: String) : BOOLEAN ;
VAR
f: String ;
BEGIN
IF Def # NIL
THEN
f := CalculateFileName (Stem, Def) ;
IF FindSourceFile (f, FullPath, named)
THEN
RETURN TRUE
END ;
f := KillString (f)
END ;
(* Try the GNU Modula-2 default extension. *)
f := CalculateFileName (Stem, Mark (InitString ('def'))) ;
RETURN FindSourceFile (f, FullPath, named)
END FindSourceDefFile ;
(*
FindSourceModFile - attempts to find the implementation module for
a module, Stem. If successful it returns
the full path and returns TRUE. If unsuccessful
then FALSE is returned and FullPath is set to NIL.
*)
PROCEDURE FindSourceModFile (Stem: String; VAR FullPath, named: String) : BOOLEAN ;
VAR
f: String ;
BEGIN
IF Mod#NIL
THEN
f := CalculateFileName (Stem, Mod) ;
IF FindSourceFile (f, FullPath, named)
THEN
RETURN TRUE
END ;
f := KillString (f)
END ;
(* Try the GNU Modula-2 default extension. *)
f := CalculateFileName (Stem, Mark (InitString ('mod'))) ;
RETURN FindSourceFile (f, FullPath, named)
END FindSourceModFile ;
(*
SetDefExtension - sets the default extension for definition modules to, ext.
The string, ext, should be deallocated by the caller at
an appropriate time.
*)
PROCEDURE SetDefExtension (ext: String) ;
BEGIN
Def := KillString (Def) ;
Def := Dup (ext)
END SetDefExtension ;
(*
SetModExtension - sets the default extension for implementation and program
modules to, ext. The string, ext, should be deallocated
by the caller at an appropriate time.
*)
PROCEDURE SetModExtension (ext: String) ;
BEGIN
Mod := KillString (Mod) ;
Mod := Dup (ext)
END SetModExtension ;
(*
Init - initializes the def and mod default string names to NIL.
*)
PROCEDURE Init ;
BEGIN
Def := NIL ;
Mod := NIL
END Init ;
BEGIN
Init
END M2Search.
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