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(* Copyright (C) 2015-2025 Free Software Foundation, Inc. *)
(* 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 GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. *)
IMPLEMENTATION MODULE mcSearch ;
FROM SFIO IMPORT Exists ;
FROM mcFileName IMPORT calculateFileName ;
FROM DynamicStrings IMPORT InitString, InitStringChar,
KillString, ConCat, ConCatChar, Index, Slice,
Add, EqualArray, Dup, Mark,
PushAllocation, PopAllocationExemption,
InitStringDB, InitStringCharStarDB,
InitStringCharDB, MultDB, DupDB, SliceDB ;
CONST
Directory = '/' ;
VAR
Def, Mod,
UserPath,
InitialPath: String ;
(*
#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 -
*)
PROCEDURE doDSdbEnter ;
BEGIN
PushAllocation
END doDSdbEnter ;
(*
doDSdbExit -
*)
PROCEDURE doDSdbExit (s: String) ;
BEGIN
s := PopAllocationExemption (TRUE, s)
END doDSdbExit ;
(*
DSdbEnter -
*)
PROCEDURE DSdbEnter ;
BEGIN
END DSdbEnter ;
(*
DSdbExit -
*)
PROCEDURE DSdbExit (s: String) ;
BEGIN
END DSdbExit ;
(*
#define DSdbEnter doDSdbEnter
#define DSdbExit doDSdbExit
*)
(*
prependSearchPath - prepends a new path to the initial search path.
*)
PROCEDURE prependSearchPath (path: String) ;
BEGIN
DSdbEnter ;
IF EqualArray (UserPath, '')
THEN
UserPath := KillString (UserPath) ;
UserPath := Dup (path)
ELSE
UserPath := ConCat (ConCatChar (UserPath, ':'), path)
END ;
DSdbExit (UserPath)
END prependSearchPath ;
(*
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: String) : BOOLEAN ;
VAR
completeSearchPath: String ;
start, end : INTEGER ;
newpath : String ;
BEGIN
IF EqualArray (UserPath, '')
THEN
IF EqualArray (InitialPath, '')
THEN
completeSearchPath := InitString ('.')
ELSE
completeSearchPath := Dup (InitialPath)
END
ELSE
completeSearchPath := ConCat (ConCatChar (Dup (UserPath), ':'), InitialPath)
END ;
start := 0 ;
end := Index (completeSearchPath, ':', CARDINAL (start)) ;
REPEAT
IF end=-1
THEN
end := 0
END ;
newpath := Slice (completeSearchPath, start, end) ;
IF EqualArray (newpath, '.')
THEN
newpath := KillString (newpath) ;
newpath := Dup (FileName)
ELSE
newpath := ConCat (ConCatChar (newpath, Directory), FileName)
END ;
IF Exists (newpath)
THEN
fullPath := newpath ;
completeSearchPath := KillString (completeSearchPath) ;
RETURN TRUE
END ;
newpath := KillString (newpath) ;
IF end#0
THEN
start := end+1 ;
end := Index (completeSearchPath, ':', CARDINAL (start))
END
UNTIL end=0 ;
fullPath := NIL ;
newpath := KillString (newpath) ;
completeSearchPath := KillString (completeSearchPath) ;
RETURN FALSE
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: String) : BOOLEAN ;
VAR
f: String ;
BEGIN
IF Def#NIL
THEN
f := calculateFileName (stem, Def) ;
IF findSourceFile (f, fullPath)
THEN
RETURN TRUE
END ;
f := KillString (f)
END ;
(* and try the GNU Modula-2 default extension *)
f := calculateFileName (stem, Mark (InitString ('def'))) ;
RETURN findSourceFile (f, fullPath)
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: String) : BOOLEAN ;
VAR
f: String ;
BEGIN
IF Mod#NIL
THEN
f := calculateFileName (stem, Mod) ;
IF findSourceFile (f, fullPath)
THEN
RETURN TRUE
END ;
f := KillString (f)
END ;
(* and try the GNU Modula-2 default extension *)
f := calculateFileName (stem, Mark (InitString ('mod'))) ;
RETURN findSourceFile (f, fullPath)
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 ;
(*
initSearchPath - assigns the search path to Path.
The string Path may take the form:
Path ::= IndividualPath { ":" IndividualPath }
IndividualPath ::= "." | DirectoryPath
DirectoryPath ::= [ "/" ] Name { "/" Name }
Name ::= Letter { (Letter | Number) }
Letter ::= A..Z | a..z
Number ::= 0..9
*)
PROCEDURE initSearchPath (path: String) ;
BEGIN
IF InitialPath#NIL
THEN
InitialPath := KillString (InitialPath)
END ;
InitialPath := path
END initSearchPath ;
(*
Init - initializes the search path.
*)
PROCEDURE Init ;
BEGIN
UserPath := InitString ('') ;
InitialPath := InitStringChar ('.') ;
Def := NIL ;
Mod := NIL
END Init ;
BEGIN
Init
END mcSearch.
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