Current File : //usr/share/perl/5.38.2/Getopt/Std.pm
package Getopt::Std;
use strict;
use warnings;
require Exporter;
=head1 NAME
Getopt::Std - Process single-character switches with switch clustering
=head1 SYNOPSIS
use Getopt::Std;
getopts('oif:'); # -o & -i are boolean flags, -f takes an argument
# Sets $opt_* as a side effect.
getopts('oif:', \%opts); # options as above. Values in %opts
getopt('oDI'); # -o, -D & -I take arg.
# Sets $opt_* as a side effect.
getopt('oDI', \%opts); # -o, -D & -I take arg. Values in %opts
=head1 DESCRIPTION
The C<getopts()> function processes single-character switches with switch
clustering. Pass one argument which is a string containing all switches to be
recognized. For each switch found, if an argument is expected and provided,
C<getopts()> sets C<$opt_x> (where C<x> is the switch name) to the value of
the argument. If an argument is expected but none is provided, C<$opt_x> is
set to an undefined value. If a switch does not take an argument, C<$opt_x>
is set to C<1>.
Switches which take an argument don't care whether there is a space between
the switch and the argument. If unspecified switches are found on the
command-line, the user will be warned that an unknown option was given.
The C<getopts()> function returns true unless an invalid option was found.
The C<getopt()> function is similar, but its argument is a string containing
all switches that take an argument. If no argument is provided for a switch,
say, C<y>, the corresponding C<$opt_y> will be set to an undefined value.
Unspecified switches are silently accepted. Use of C<getopt()> is not
recommended.
Note that, if your code is running under the recommended C<use strict
vars> pragma, you will need to declare these package variables
with C<our>:
our($opt_x, $opt_y);
For those of you who don't like additional global variables being created,
C<getopt()> and C<getopts()> will also accept a hash reference as an optional
second argument. Hash keys will be C<x> (where C<x> is the switch name) with
key values the value of the argument or C<1> if no argument is specified.
To allow programs to process arguments that look like switches, but aren't,
both functions will stop processing switches when they see the argument
C<-->. The C<--> will be removed from @ARGV.
=head1 C<--help> and C<--version>
If C<-> is not a recognized switch letter, getopts() supports arguments
C<--help> and C<--version>. If C<main::HELP_MESSAGE()> and/or
C<main::VERSION_MESSAGE()> are defined, they are called; the arguments are
the output file handle, the name of option-processing package, its version,
and the switches string. If the subroutines are not defined, an attempt is
made to generate intelligent messages; for best results, define $main::VERSION.
If embedded documentation (in pod format, see L<perlpod>) is detected
in the script, C<--help> will also show how to access the documentation.
Note that due to excessive paranoia, if $Getopt::Std::STANDARD_HELP_VERSION
isn't true (the default is false), then the messages are printed on STDERR,
and the processing continues after the messages are printed. This being
the opposite of the standard-conforming behaviour, it is strongly recommended
to set $Getopt::Std::STANDARD_HELP_VERSION to true.
One can change the output file handle of the messages by setting
$Getopt::Std::OUTPUT_HELP_VERSION. One can print the messages of C<--help>
(without the C<Usage:> line) and C<--version> by calling functions help_mess()
and version_mess() with the switches string as an argument.
=cut
our @ISA = qw(Exporter);
our @EXPORT = qw(getopt getopts);
our $VERSION = '1.13';
# uncomment the next line to disable 1.03-backward compatibility paranoia
# $STANDARD_HELP_VERSION = 1;
# Process single-character switches with switch clustering. Pass one argument
# which is a string containing all switches that take an argument. For each
# switch found, sets $opt_x (where x is the switch name) to the value of the
# argument, or 1 if no argument. Switches which take an argument don't care
# whether there is a space between the switch and the argument.
# Usage:
# getopt('oDI'); # -o, -D & -I take arg. Sets opt_* as a side effect.
sub getopt (;$$) {
my ($argumentative, $hash) = @_;
$argumentative = '' if !defined $argumentative;
my ($first,$rest);
local $_;
local @EXPORT;
while (@ARGV && ($_ = $ARGV[0]) =~ /^-(.)(.*)/) {
($first,$rest) = ($1,$2);
if (/^--$/) { # early exit if --
shift @ARGV;
last;
}
if (index($argumentative,$first) >= 0) {
if ($rest ne '') {
shift(@ARGV);
}
else {
shift(@ARGV);
$rest = shift(@ARGV);
}
if (ref $hash) {
$$hash{$first} = $rest;
}
else {
no strict 'refs';
${"opt_$first"} = $rest;
push( @EXPORT, "\$opt_$first" );
}
}
else {
if (ref $hash) {
$$hash{$first} = 1;
}
else {
no strict 'refs';
${"opt_$first"} = 1;
push( @EXPORT, "\$opt_$first" );
}
if ($rest ne '') {
$ARGV[0] = "-$rest";
}
else {
shift(@ARGV);
}
}
}
unless (ref $hash) {
local $Exporter::ExportLevel = 1;
import Getopt::Std;
}
}
our ($OUTPUT_HELP_VERSION, $STANDARD_HELP_VERSION);
sub output_h () {
return $OUTPUT_HELP_VERSION if defined $OUTPUT_HELP_VERSION;
return \*STDOUT if $STANDARD_HELP_VERSION;
return \*STDERR;
}
sub try_exit () {
exit 0 if $STANDARD_HELP_VERSION;
my $p = __PACKAGE__;
print {output_h()} <<EOM;
[Now continuing due to backward compatibility and excessive paranoia.
See 'perldoc $p' about \$$p\::STANDARD_HELP_VERSION.]
EOM
}
sub version_mess ($;$) {
my $args = shift;
my $h = output_h;
if (@_ and defined &main::VERSION_MESSAGE) {
main::VERSION_MESSAGE($h, __PACKAGE__, $VERSION, $args);
} else {
my $v = $main::VERSION;
$v = '[unknown]' unless defined $v;
my $myv = $VERSION;
$myv .= ' [paranoid]' unless $STANDARD_HELP_VERSION;
my $perlv = $];
$perlv = sprintf "%vd", $^V if $] >= 5.006;
print $h <<EOH;
$0 version $v calling Getopt::Std::getopts (version $myv),
running under Perl version $perlv.
EOH
}
}
sub help_mess ($;$) {
my $args = shift;
my $h = output_h;
if (@_ and defined &main::HELP_MESSAGE) {
main::HELP_MESSAGE($h, __PACKAGE__, $VERSION, $args);
} else {
my (@witharg) = ($args =~ /(\S)\s*:/g);
my (@rest) = ($args =~ /([^\s:])(?!\s*:)/g);
my ($help, $arg) = ('', '');
if (@witharg) {
$help .= "\n\tWith arguments: -" . join " -", @witharg;
$arg = "\nSpace is not required between options and their arguments.";
}
if (@rest) {
$help .= "\n\tBoolean (without arguments): -" . join " -", @rest;
}
my ($scr) = ($0 =~ m,([^/\\]+)$,);
print $h <<EOH if @_; # Let the script override this
Usage: $scr [-OPTIONS [-MORE_OPTIONS]] [--] [PROGRAM_ARG1 ...]
EOH
print $h <<EOH;
The following single-character options are accepted:$help
Options may be merged together. -- stops processing of options.$arg
EOH
my $has_pod;
if ( defined $0 and $0 ne '-e' and -f $0 and -r $0
and open my $script, '<', $0 ) {
while (<$script>) {
$has_pod = 1, last if /^=(pod|head1)/;
}
}
print $h <<EOH if $has_pod;
For more details run
perldoc -F $0
EOH
}
}
# Usage:
# getopts('a:bc'); # -a takes arg. -b & -c not. Sets opt_* as a
# # side effect.
sub getopts ($;$) {
my ($argumentative, $hash) = @_;
my (@args,$first,$rest,$exit);
my $errs = 0;
local $_;
local @EXPORT;
@args = split( / */, $argumentative );
while(@ARGV && ($_ = $ARGV[0]) =~ /^-(.)(.*)/s) {
($first,$rest) = ($1,$2);
if (/^--$/) { # early exit if --
shift @ARGV;
last;
}
my $pos = index($argumentative,$first);
if ($pos >= 0) {
if (defined($args[$pos+1]) and ($args[$pos+1] eq ':')) {
shift(@ARGV);
if ($rest eq '') {
++$errs unless @ARGV;
$rest = shift(@ARGV);
}
if (ref $hash) {
$$hash{$first} = $rest;
}
else {
no strict 'refs';
${"opt_$first"} = $rest;
push( @EXPORT, "\$opt_$first" );
}
}
else {
if (ref $hash) {
$$hash{$first} = 1;
}
else {
no strict 'refs';
${"opt_$first"} = 1;
push( @EXPORT, "\$opt_$first" );
}
if ($rest eq '') {
shift(@ARGV);
}
else {
$ARGV[0] = "-$rest";
}
}
}
else {
if ($first eq '-' and $rest eq 'help') {
version_mess($argumentative, 'main');
help_mess($argumentative, 'main');
try_exit();
shift(@ARGV);
next;
} elsif ($first eq '-' and $rest eq 'version') {
version_mess($argumentative, 'main');
try_exit();
shift(@ARGV);
next;
}
warn "Unknown option: $first\n";
++$errs;
if ($rest ne '') {
$ARGV[0] = "-$rest";
}
else {
shift(@ARGV);
}
}
}
unless (ref $hash) {
local $Exporter::ExportLevel = 1;
import Getopt::Std;
}
$errs == 0;
}
1;
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