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(* SCmdArgs.mod provides procedures to retrieve arguments from strings.
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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. *)
IMPLEMENTATION MODULE SCmdArgs ;
FROM ASCII IMPORT cr, nul ;
FROM DynamicStrings IMPORT Length, Slice, char ;
CONST
esc = '\' ;
space = ' ' ;
squote = "'" ;
dquote = '"' ;
tab = ' ' ;
(*
isWhite -
*)
PROCEDURE isWhite (ch: CHAR) : BOOLEAN ;
BEGIN
RETURN (ch=space) OR (ch=tab)
END isWhite ;
(*
skipWhite -
*)
PROCEDURE skipWhite (s: String; i, e: INTEGER) : INTEGER ;
VAR
ch: CHAR ;
BEGIN
WHILE i<e DO
ch := char(s, i) ;
IF isWhite(ch)
THEN
INC(i)
ELSE
RETURN( i )
END
END ;
RETURN( i )
END skipWhite ;
(*
skipOverWhite -
*)
PROCEDURE skipOverWhite (s: String; start, end: INTEGER) : INTEGER ;
BEGIN
INC(start) ;
WHILE (start<end) AND (NOT isWhite(char(s, start))) DO
INC(start)
END ;
RETURN( start )
END skipOverWhite ;
(*
skipOver -
*)
PROCEDURE skipOver (s: String; start, end: INTEGER; ch: CHAR) : INTEGER ;
BEGIN
INC(start) ;
WHILE (start<end) AND (char(s, start)#ch) DO
INC(start)
END ;
RETURN( start )
END skipOver ;
(*
skipNextArg -
*)
PROCEDURE skipNextArg (s: String; start, end: INTEGER) : INTEGER ;
VAR
ch: CHAR ;
BEGIN
IF start<end
THEN
ch := char(s, start) ;
IF ch=dquote
THEN
end := skipOver(s, start, end, dquote)
ELSIF ch=squote
THEN
end := skipOver(s, start, end, squote)
ELSE
end := skipOverWhite(s, start, end)
END
END ;
RETURN( end )
END skipNextArg ;
(*
GetArg - takes a command line and attempts to extract argument, n,
from CmdLine. The resulting argument is placed into, a.
The result of the operation is returned.
*)
PROCEDURE GetArg (CmdLine: String;
n: CARDINAL; VAR Argi: String) : BOOLEAN ;
VAR
i : CARDINAL ;
sn,
start, end: INTEGER ;
ch : CHAR ;
BEGIN
i := 0 ;
start := 0 ;
end := Length(CmdLine) ;
WHILE i<n DO
start := skipWhite(CmdLine, start, end) ;
sn := skipNextArg(CmdLine, start, end) ;
IF sn<end
THEN
start := sn ;
INC(i)
ELSE
RETURN( FALSE )
END
END ;
start := skipWhite(CmdLine, start, end) ;
sn := skipNextArg(CmdLine, start, end) ;
Argi := Slice(CmdLine, start, sn) ;
RETURN( TRUE )
END GetArg ;
(*
Narg - returns the number of arguments available from
command line, CmdLine.
*)
PROCEDURE Narg (CmdLine: String) : CARDINAL ;
VAR
n : CARDINAL ;
s,
start, end: INTEGER ;
BEGIN
n := 0 ;
start := 0 ;
end := Length(CmdLine) ;
LOOP
start := skipWhite(CmdLine, start, end) ;
s := skipNextArg(CmdLine, start, end) ;
IF s<end
THEN
start := s ;
INC(n)
ELSE
RETURN( n )
END
END
END Narg ;
PROCEDURE Escape (ch: CHAR) : BOOLEAN ;
BEGIN
RETURN( ch=esc )
END Escape ;
PROCEDURE Space (ch: CHAR) : BOOLEAN ;
BEGIN
RETURN( (ch=space) OR (ch=tab) )
END Space ;
PROCEDURE DoubleQuote (ch: CHAR) : BOOLEAN ;
BEGIN
RETURN( ch=dquote )
END DoubleQuote ;
PROCEDURE SingleQuote (ch: CHAR) : BOOLEAN ;
BEGIN
RETURN( ch=squote )
END SingleQuote ;
END SCmdArgs.
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