363 lines
11 KiB
Perl
363 lines
11 KiB
Perl
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# -*- Perl -*-
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# Copyright (c) 1997-2006 Motoyuki Kasahara
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. Neither the name of the project nor the names of its contributors
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# may be used to endorse or promote products derived from this software
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# without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# This program is a Perl package running on Perl 4.036 or later.
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# The package provides routines to process command line options like
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# as GNU getopt_long().
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#
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# Version:
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# 2.0
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#
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# Interface:
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#
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# &getopt_initialize(LIST)
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# Set a list of command line options and initialize internal data
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# for &getopt_long.
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# You must call the routine before calling &getopt_long.
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# Format of each element in the LIST is:
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#
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# `CANONICAL-OPTION-NAME [ALIAS-OPTION-NAME...] ARGUMENT-FLAG'
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#
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# CANONICAL-OPTION-NAME, ALIAS-OPTION-NAME and ARGUMENT-FLAG fields
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# are separated by spaces or tabs.
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#
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# CANONICAL-OPTION-NAME and ALIAS-OPTION-NAME must be either a single
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# character option including preceding `-' (e.g. `-v'), or a long
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# name option including preceding `--' (e.g. `--version'). Whether
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# CANONICAL-OPTION-NAME is single character option or long name
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# option is not significant.
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#
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# ARGUMENT-FLAG must be `no-argument', `required-argument' or
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# `optional-argument'. If it is set to `required-argument', the
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# option always takes an argument. If set to `optional-argument',
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# an argument to the option is optional.
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#
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# You can put a special element `+' or `-' at the first element in
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# LIST. See `Details about Option Processing:' for details.
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# If succeeded to initialize, 1 is returned. Otherwise 0 is
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# returned.
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#
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# &getopt_long
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# Get a option name, and if exists, its argument of the leftmost
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# option in @ARGV.
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#
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# An option name and its argument are returned as a list with two
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# elements; the first element is CANONICAL-OPTION-NAME of the option,
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# and second is its argument.
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# Upon return, the option and its argument are removed from @ARGV.
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# When you have already got all options in @ARGV, an empty list is
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# returned. In this case, only non-option elements are left in
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# @ARGV.
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#
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# When an error occurs, an error message is output to standard
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# error, and the option name in a returned list is set to `?'.
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#
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# Example:
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#
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# &getopt_intialize('--help -h no-argument', '--version -v no-argument')
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# || die;
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#
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# while (($name, $arg) = &getopt_long) {
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# die "For help, type \`$0 --help\'\n" if ($name eq '?');
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# $opts{$name} = $arg;
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# }
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#
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# Details about Option Processing:
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#
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# * There are three processing modes:
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# 1. PERMUTE
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# It permutes the contents of ARGV as it scans, so that all the
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# non-option ARGV-elements are at the end. This mode is default.
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# 2. REQUIRE_ORDER
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# It stops option processing when the first non-option is seen.
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# This mode is chosen if the environment variable POSIXLY_CORRECT
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# is defined, or the first element in the option list is `+'.
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# 3. RETURN_IN_ORDER
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# It describes each non-option ARGV-element as if it were the
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# argument of an option with an empty name.
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# This mode is chosen if the first element in the option list is
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# `-'.
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#
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# * An argument starting with `-' and not exactly `-', is a single
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# character option.
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# If the option takes an argument, it must be specified at just
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# behind the option name (e.g. `-f/tmp/file'), or at the next
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# ARGV-element of the option name (e.g. `-f /tmp/file').
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# If the option doesn't have an argument, other single character
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# options can be followed within an ARGV-element. For example,
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# `-l -g -d' is identical to `-lgd'.
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#
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# * An argument starting with `--' and not exactly `--', is a long
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# name option.
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# If the option has an argument, it can be specified at behind the
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# option name preceded by `=' (e.g. `--option=argument'), or at the
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# next ARGV-element of the option name (e.g. `--option argument').
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# Long name options can be abbreviated as long as the abbreviation
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# is unique.
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#
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# * The special argument `--' forces an end of option processing.
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#
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{
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package getopt_long;
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$initflag = 0;
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$REQUIRE_ORDER = 0;
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$PERMUTE = 1;
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$RETURN_IN_ORDER = 2;
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}
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#
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# Initialize the internal data.
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#
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sub getopt_initialize {
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local(@fields);
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local($name, $flag, $canon);
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local($_);
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#
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# Determine odering.
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#
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if ($_[$[] eq '+') {
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$getopt_long'ordering = $getopt_long'REQUIRE_ORDER;
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shift(@_);
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} elsif ($_[$[] eq '-') {
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$getopt_long'ordering = $getopt_long'RETURN_IN_ORDER;
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shift(@_);
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} elsif (defined($ENV{'POSIXLY_CORRECT'})) {
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$getopt_long'ordering = $getopt_long'REQUIRE_ORDER;
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} else {
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$getopt_long'ordering = $getopt_long'PERMUTE;
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}
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#
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# Parse an option list.
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#
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%getopt_long'optnames = ();
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%getopt_long'argflags = ();
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foreach (@_) {
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@fields = split(/[ \t]+/, $_);
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if (@fields < 2) {
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warn "$0: (getopt_initialize) too few fields \`$arg\'\n";
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return 0;
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}
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$flag = pop(@fields);
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if ($flag ne 'no-argument' && $flag ne 'required-argument'
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&& $flag ne 'optional-argument') {
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warn "$0: (getopt_initialize) invalid argument flag \`$flag\'\n";
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return 0;
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}
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$canon = '';
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foreach $name (@fields) {
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if ($name !~ /^-([^-]|-.+)$/) {
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warn "$0: (getopt_initialize) invalid option name \`$name\'\n";
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return 0;
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} elsif (defined($getopt_long'optnames{$name})) {
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warn "$0: (getopt_initialize) redefined option \`$name\'\n";
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return 0;
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}
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$canon = $name if ($canon eq '');
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$getopt_long'optnames{$name} = $canon;
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$getopt_long'argflags{$name} = $flag;
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}
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}
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$getopt_long'endflag = 0;
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$getopt_long'shortrest = '';
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@getopt_long'nonopts = ();
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$getopt_long'initflag = 1;
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}
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#
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# When it comes to the end of options, restore PERMUTEd non-option
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# arguments to @ARGV.
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#
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sub getopt_end {
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$getopt_long'endflag = 1;
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unshift(@ARGV, @getopt_long'nonopts);
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}
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#
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# Scan elements of @ARGV for getting an option.
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#
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sub getopt_long {
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local($name, $arg) = ('', 1);
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local($patt, $key, $ambig, $ch);
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local($_);
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&getopt_initialize(@_) if (!$getopt_long'initflag);
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return () if ($getopt_long'endflag);
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#
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# Take the next argument from @ARGV.
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#
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if ($getopt_long'shortrest ne '') {
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$_ = '-'.$getopt_long'shortrest;
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} elsif (@ARGV == 0) {
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&getopt_end;
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return ();
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} elsif ($getopt_long'ordering == $getopt_long'REQUIRE_ORDER) {
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$_ = shift(@ARGV);
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if (!/^-./) {
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push(@getopt_long'nonopts, $_);
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&getopt_end;
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return ();
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}
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} elsif ($getopt_long'ordering == $getopt_long'PERMUTE) {
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for (;;) {
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if (@ARGV == 0) {
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&getopt_end;
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return ();
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}
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$_ = shift(@ARGV);
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last if (/^-./);
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push(@getopt_long'nonopts, $_);
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}
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} else { # RETURN_IN_ORDER
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$_ = shift(@ARGV);
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}
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#
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# Check for the special option `--'.
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#
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if ($_ eq '--' && $getopt_long'shortrest eq '') {
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#
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# `--' indicates the end of the option list.
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#
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&getopt_end;
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return ();
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}
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#
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# Check for long and short options.
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#
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if (/^(--[^=]+)/ && $getopt_long'shortrest eq '') {
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#
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# Long style option, which start with `--'.
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# Abbreviations for option names are allowed as long as
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# they are unique.
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#
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$patt = $1;
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if (defined($getopt_long'optnames{$patt})) {
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$name = $patt;
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} else {
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$ambig = 0;
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foreach $key (keys(%getopt_long'optnames)) {
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if (index($key, $patt) == 0) {
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if ($name eq '') {
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$name = $key;
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} else {
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$ambig = 1;
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}
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}
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}
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if ($ambig) {
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warn "$0: option \`$_\' is ambiguous\n";
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return ('?', '');
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}
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if ($name eq '') {
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warn "$0: unrecognized option \`$_\'\n";
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return ('?', '');
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}
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}
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if ($getopt_long'argflags{$name} eq 'required-argument') {
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if (/=(.*)$/) {
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$arg = $1;
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} elsif (0 < @ARGV) {
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$arg = shift(@ARGV);
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} else {
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warn "$0: option \`$_\' requires an argument\n";
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return ('?', '');
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}
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} elsif ($getopt_long'argflags{$name} eq 'optional-argument') {
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if (/=(.*)$/) {
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$arg = $1;
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} elsif (0 < @ARGV && $ARGV[$[] !~ /^-./) {
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$arg = shift(@ARGV);
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} else {
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$arg = '';
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}
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} elsif (/=(.*)$/) {
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warn "$0: option \`$name\' doesn't allow an argument\n";
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return ('?', '');
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}
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} elsif (/^(-(.))(.*)/) {
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#
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# Short style option, which start with `-' (not `--').
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#
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($name, $ch, $getopt_long'shortrest) = ($1, $2, $3);
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if (defined($getopt_long'optnames{$name})) {
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if ($getopt_long'argflags{$name} eq 'required-argument') {
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if ($getopt_long'shortrest ne '') {
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$arg = $getopt_long'shortrest;
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$getopt_long'shortrest = '';
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} elsif (0 < @ARGV) {
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$arg = shift(@ARGV);
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} else {
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# 1003.2 specifies the format of this message.
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warn "$0: option requires an argument -- $ch\n";
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return ('?', '');
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}
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} elsif ($getopt_long'argflags{$name} eq 'optional-argument') {
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if ($getopt_long'shortrest ne '') {
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$arg = $getopt_long'shortrest;
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$getopt_long'shortrest = '';
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} elsif (0 < @ARGV && $ARGV[$[] !~ /^-./) {
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$arg = shift(@ARGV);
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} else {
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$arg = '';
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}
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}
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} elsif (defined($ENV{'POSIXLY_CORRECT'})) {
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# 1003.2 specifies the format of this message.
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warn "$0: illegal option -- $ch\n";
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return ('?', '');
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} else {
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warn "$0: invalid option -- $ch\n";
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return ('?', '');
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}
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} else {
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#
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# Only RETURN_IN_ORDER falled into here.
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#
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$arg = $_;
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}
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return ($getopt_long'optnames{$name}, $arg);
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}
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1;
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