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Finds if a perl file contains 5.10-isms but lacks the "use 5.010" at the top
#!/usr/bin/env perl
#
# Finds if a perl file contains 5.10-isms
# but lacks the "use 5.010" at the top
#
use strict;
use warnings;
use Data::Dumper ();
use Getopt::Long ();
use PPI ();
sub ppi_find_use_perl {
my ($version) = @_;
# We'll stick the version in a regex (5.010 -> 5\.010)
$version = quotemeta $version;
my $ppi_find_sub = sub {
my $node = $_[1];
return unless $node->isa('PPI::Statement::Include');
if ($node->content() =~ m{^use \s+ $version}xo) {
return 1;
}
return 0;
};
return $ppi_find_sub;
}
sub has_explicit_version_use {
my ($ppi_doc, $v) = @_;
my $find_use = ppi_find_use_perl($v);
# If the document has a 'use <version>' then we're good
my $has_use = $ppi_doc->find_any($find_use);
return $has_use;
}
sub is_510_only_operator {
my $node = $_[1];
if (! $node->isa('PPI::Token::Operator')) {
return 0;
}
my $op = $node->content;
return 1 if
$op eq '//'
|| $op eq '//='
|| $op eq '~~'
|| $op eq '!~~' ;
return 0;
}
sub is_510_only_keyword {
my $node = $_[1];
if (! $node->isa('PPI::Token::Word')) {
return 0;
}
my $kw = $node->content;
return $kw eq 'say' ? 1 : 0;
}
sub has_510isms_without_use {
my ($file) = @_;
my $ppi_doc = PPI::Document->new($file);
if (has_explicit_version_use($ppi_doc, '5.010')) {
return;
}
if (my $nodes = $ppi_doc->find(\&is_510_only_operator)) {
for (@{ $nodes }) {
warn Data::Dumper::Dumper($_) . "\n";
}
return 1;
}
if (my $nodes = $ppi_doc->find(\&is_510_only_keyword)) {
for (@{ $nodes }) {
warn Data::Dumper::Dumper($_) . "\n";
}
return 1;
}
return;
}
Getopt::Long::GetOptions(
'file=s' => \my $file,
);
if (! $file) {
warn "No file specified. Usage: $0 --file <some-file>\n";
exit 1;
}
elsif (! -e $file) {
warn "Can't read file '$file': $!\n";
exit 2;
}
my $bad_guy = has_510isms_without_use($file);
if ($bad_guy) {
print "Looks like you forgot a 'use 5.010;'\n";
}
else {
print "Good boy\n";
}
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