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#!/usr/bin/perl
# RPM (and its source code) is covered under two separate licenses.
# The entire code base may be distributed under the terms of the GNU
# General Public License (GPL), which appears immediately below.
# Alternatively, all of the source code in the lib subdirectory of the
# RPM source code distribution as well as any code derived from that
# code may instead be distributed under the GNU Library General Public
# License (LGPL), at the choice of the distributor. The complete text
# of the LGPL appears at the bottom of this file.
# This alternatively is allowed to enable applications to be linked
# against the RPM library (commonly called librpm) without forcing
# such applications to be distributed under the GPL.
# Any questions regarding the licensing of RPM should be addressed to
# Erik Troan <ewt@redhat.com>.
# a simple makedepend like script for perl.
# To save development time I do not parse the perl grammar but
# instead just lex it looking for what I want. I take special care to
# ignore comments and pod's.
# It would be much better if perl could tell us the dependencies of a
# given script.
# The filenames to scan are either passed on the command line or if
# that is empty they are passed via stdin.
# If there are strings in the file which match the pattern
# m/^\s*\$RPM_Requires\s*=\s*["'](.*)['"]/i
# then these are treated as additional names which are required by the
# file and are printed as well.
# I plan to rewrite this in C so that perl is not required by RPM at
# build time.
# by Ken Estes Mail.com kestes@staff.mail.com
$HAVE_VERSION = 0;
eval { require version; $HAVE_VERSION = 1; };
use File::Basename;
my $dir = dirname($0);
$HAVE_PROV = 0;
if ( -e "$dir/perl.prov" ) {
$HAVE_PROV = 1;
$prov_script = "$dir/perl.prov";
}
if ("@ARGV") {
foreach my $file (@ARGV) {
process_file($file);
process_file_provides($file);
compute_global_requires();
}
} else {
# notice we are passed a list of filenames NOT as common in unix the
# contents of the file.
foreach my $file (<>) {
process_file($file);
process_file_provides($file);
compute_global_requires();
}
}
foreach $perlver (sort keys %perlreq) {
print "perl >= $perlver\n";
}
foreach my $module (sort keys %global_require) {
if (length($global_require{$module}) == 0) {
print "perl($module)\n";
} else {
# I am not using rpm3.0 so I do not want spaces around my
# operators. Also I will need to change the processing of the
# $RPM_* variable when I upgrade.
print "perl($module) >= $global_require{$module}\n";
}
}
exit 0;
sub compute_global_requires {
# restrict require_removable to all non provided by the file
foreach my $moduler (sort keys %require_removable) {
if (exists $provide{$moduler} && length($require_removable{$moduler}) == 0) {
$require_removable = delete $require_removable{$moduler};
}
}
# store requires to global_requires
foreach my $module (sort keys %require) {
my $oldver = $global_require{$module};
my $newver = $require{$module};
if ($oldver) {
$global_require{$module} = $newver
if ($HAVE_VERSION && $newver && version->new($oldver) < $newver);
} else {
$global_require{$module} = $newver;
}
}
# store requires_removable to global_requires
foreach my $module (sort keys %require_removable) {
my $oldver = $global_require{$module};
my $newver = $require_removable{$module};
if ($oldver) {
$global_require{$module} = $newver
if ($HAVE_VERSION && $newver && version->new($oldver) < $newver);
} else {
$global_require{$module} = $newver;
}
}
# remove all local requires and provides
undef %require;
undef %require_removable;
undef %provide;
}
sub add_require {
my ($module, $newver) = @_;
my $oldver = $require{$module};
if ($oldver) {
$require{$module} = $newver
if ($HAVE_VERSION && $newver && version->new($oldver) < $newver);
}
else {
$require{$module} = $newver;
}
}
sub add_require_removable {
my ($module, $newver) = @_;
my $oldver = $require_removable{$module};
if ($oldver) {
$require_removable{$module} = $newver
if ($HAVE_VERSION && $newver && version->new($oldver) < $newver);
}
else {
$require_removable{$module} = $newver;
}
}
sub process_file {
my ($file) = @_;
chomp $file;
if (!open(FILE, $file)) {
warn("$0: Warning: Could not open file '$file' for reading: $!\n");
return;
}
while (<FILE>) {
# skip the "= <<" block
if (m/^\s*(?:my\s*)?\$(?:.*)\s*=\s*<<\s*(["'`])(.+?)\1/ ||
m/^\s*(?:my\s*)?\$(.*)\s*=\s*<<(\w+)\s*;/) {
$tag = $2;
while (<FILE>) {
chomp;
( $_ eq $tag ) && last;
}
$_ = <FILE>;
}
# skip q{} quoted sections - just hope we don't have curly brackets
# within the quote, nor an escaped hash mark that isn't a comment
# marker, such as occurs right here. Draw the line somewhere.
if ( m/^.*\Wq[qxwr]?\s*([{([#|\/])[^})\]#|\/]*$/ && ! m/^\s*(require|use)\s/ ) {
$tag = $1;
$tag =~ tr/{\(\[\#|\//})]#|\//;
$tag = quotemeta($tag);
while (<FILE>) {
( $_ =~ m/$tag/ ) && last;
}
}
# skip the documentation
# we should not need to have item in this if statement (it
# properly belongs in the over/back section) but people do not
# read the perldoc.
if (/^=(head[1-4]|pod|for|item)/) {
/^=cut/ && next while <FILE>;
}
if (/^=over/) {
/^=back/ && next while <FILE>;
}
# skip the data section
if (m/^__(DATA|END)__$/) {
last;
}
# Each keyword can appear multiple times. Don't
# bother with datastructures to store these strings,
# if we need to print it print it now.
#
# Again allow for "our".
if (m/^\s*(our\s+)?\$RPM_Requires\s*=\s*["'](.*)['"]/i) {
foreach $_ (split(/\s+/, $2)) {
print "$_\n";
}
}
my $modver_re = qr/[.0-9]+/;
#
# The (require|use) match further down in this subroutine will match lines
# within a multi-line print or return statements. So, let's skip over such
# statements whose content should not be loading modules anyway. -BEF-
#
if (m/print(?:\s+|\s+\S+\s+)\<\<\s*(["'`])(.+?)\1/ ||
m/print(\s+|\s+\S+\s+)\<\<(\w+)/ ||
m/return(\s+)\<\<(\w+)/ ) {
my $tag = $2;
while (<FILE>) {
chomp;
( $_ eq $tag ) && last;
}
$_ = <FILE>;
}
# Skip multiline print and assign statements
if ( m/\$\S+\s*=\s*(")([^"\\]|(\\.))*$/ ||
m/\$\S+\s*=\s*(')([^'\\]|(\\.))*$/ ||
m/print\s+(")([^"\\]|(\\.))*$/ ||
m/print\s+(')([^'\\]|(\\.))*$/ ) {
my $quote = $1;
while (<FILE>) {
m/^([^\\$quote]|(\\.))*$quote/ && last;
}
$_ = <FILE>;
}
# Skip multiline print and assign statements
if ( m/\$\S+\s*=\s*(")([^"\\]|(\\.))*$/ ||
m/\$\S+\s*=\s*(')([^'\\]|(\\.))*$/ ||
m/print\s+(")([^"\\]|(\\.))*$/ ||
m/print\s+(')([^'\\]|(\\.))*$/ ) {
my $quote = $1;
while (<FILE>) {
m/^([^\\$quote]|(\\.))*$quote/ && last;
}
$_ = <FILE>;
}
if (
# ouch could be in a eval, perhaps we do not want these since we catch
# an exception they must not be required
# eval { require Term::ReadLine } or die $@;
# eval "require Term::Rendezvous;" or die $@;
# eval { require Carp } if defined $^S; # If error/warning during compilation,
(m/^(\s*) # we hope the inclusion starts the line
(require|use)\s+(?!\{) # do not want 'do {' loops
# quotes around name are always legal
['"]?([^; '"\t#]+)['"]?[\t; ]
# the syntax for 'use' allows version requirements
# the latter part is for "use base qw(Foo)" and friends special case
\s*($modver_re|(qw\s*[(\/'"]\s*|['"])[^)\/"'\$]*?\s*[)\/"'])?
/x)
) {
my ($whitespace, $statement, $module, $version) = ($1, $2, $3, $4);
# we only consider require statements that are flushed against
# the left edge. any other require statements give too many
# false positives, as they are usually inside of an if statement
# as a fallback module or a rarely used option
($whitespace ne "" && $statement eq "require") && next;
# if there is some interpolation of variables just skip this
# dependency, we do not want
# do "$ENV{LOGDIR}/$rcfile";
($module =~ m/\$/) && next;
# skip if the phrase was "use of" -- shows up in gimp-perl, et al.
next if $module eq 'of';
# if the module ends in a comma we probably caught some
# documentation of the form 'check stuff,\n do stuff, clean
# stuff.' there are several of these in the perl distribution
($module =~ m/[,>]$/) && next;
# if the module name starts in a dot it is not a module name.
# Is this necessary? Please give me an example if you turn this
# back on.
# ($module =~ m/^\./) && next;
# if the module starts with /, it is an absolute path to a file
if ($module =~ m(^/)) {
next;
}
# sometimes people do use POSIX qw(foo), or use POSIX(qw(foo)) etc.
# we can strip qw.*$, as well as (.*$:
$module =~ s/qw.*$//;
$module =~ s/\(.*$//;
# if the module ends with .pm, strip it to leave only basename.
$module =~ s/\.pm$//;
# some perl programmers write 'require URI/URL;' when
# they mean 'require URI::URL;'
$module =~ s/\//::/;
# trim off trailing parentheses if any. Sometimes people pass
# the module an empty list.
$module =~ s/\(\s*\)$//;
if ( $module =~ m/^v?([0-9._]+)$/ ) {
# if module is a number then both require and use interpret that
# to mean that a particular version of perl is specified
my $ver = $1;
if ($ver =~ /5.00/) {
$perlreq{"0:$ver"} = 1;
next;
}
else {
$perlreq{"1:$ver"} = 1;
next;
}
};
# ph files do not use the package name inside the file.
# perlmodlib documentation says:
# the .ph files made by h2ph will probably end up as
# extension modules made by h2xs.
# so do not expend much effort on these.
# there is no easy way to find out if a file named systeminfo.ph
# will be included with the name sys/systeminfo.ph so only use the
# basename of *.ph files
($module =~ m/\.ph$/) && next;
# use base|parent qw(Foo) dependencies
if ($statement eq "use" && ($module eq "base" || $module eq "parent")) {
add_require($module, undef);
if ($version =~ /^qw\s*[(\/'"]\s*([^)\/"']+?)\s*[)\/"']/) {
add_require($_, undef) for split(' ', $1);
}
elsif ($version =~ /(["'])([^"']+)\1/) {
# requires like "use base name" can be removed if they are
# provided in the same file
if (($whitespace eq "") && ($statement eq "use") && ($module eq "base")) {
add_require_removable($2, undef);
} else {
add_require($2, undef);
}
}
next;
}
$version = undef unless $version =~ /^$modver_re$/o;
add_require($module, $version);
}
}
close(FILE) ||
die("$0: Could not close file: '$file' : $!\n");
return;
}
sub process_file_provides {
my ($file) = @_;
chomp $file;
return if (! $HAVE_PROV);
my @result = readpipe( "$prov_script $file" );
foreach my $prov (@result) {
$provide{$1} = undef if $prov =~ /perl\(([_:a-zA-Z0-9]+)\)/;
}
}