File Coverage

blib/lib/BSON/Regex.pm

Criterion	Covered	Total	%
statement	48	48	100.0
branch	13	14	92.8
condition			n/a
subroutine	11	11	100.0
pod	2	3	66.6
total	74	76	97.3

use 5.010001;
use strict;
use warnings;

package BSON::Regex;
# ABSTRACT: BSON type wrapper for regular expressions

use version;
our $VERSION = 'v1.12.0';

use Carp ();
use Tie::IxHash;

use Moo;

#pod =attr pattern
#pod
#pod A B containing a PCRE regular expression pattern (not a C object
#pod and without slashes).  Default is the empty string.
#pod
#pod =cut

#pod =attr flags
#pod
#pod A string with regular expression flags.  Flags will be sorted and
#pod duplicates will be removed during object construction.  Supported flags
#pod include C.  Invalid flags will cause an exception.
#pod Default is the empty string.
#pod
#pod =cut

has [qw/pattern flags/] => (
    is => 'ro'
);

use namespace::clean -except => 'meta';

my %ALLOWED_FLAGS = map { $_ => 1 } qw/i m x l s u/;

sub BUILD {
    my $self = shift;

    $self->{pattern} = '' unless defined($self->{pattern});
    $self->{flags} = '' unless defined($self->{flags});

    if ( length $self->{flags} ) {
        my %seen;
        my @flags = grep { !$seen{$_}++ } split '', $self->{flags};
        foreach my $f (@flags) {
            Carp::croak("Regex flag $f is not supported")
              if not exists $ALLOWED_FLAGS{$f};
        }

        # sort flags
        $self->{flags} = join '', sort @flags;
    }

}

#pod =method try_compile
#pod
#pod     my $qr = $regexp->try_compile;
#pod
#pod Tries to compile the C and C into a reference to a regular
#pod expression.  If the pattern or flags can't be compiled, a
#pod exception will be thrown.
#pod
#pod B: Executing a regular expression can evaluate arbitrary
#pod code if the L 'eval' pragma is in force.  You are strongly advised
#pod to read L and never to use untrusted input with C.
#pod
#pod =cut

sub try_compile {
    my ($self) = @_;
    my ( $p, $f ) = @{$self}{qw/pattern flags/};
    my $re = length($f) ? eval { qr/(?$f:$p)/ } : eval { qr/$p/ };
    Carp::croak("error compiling regex 'qr/$p/$f': $@")
      if $@;
    return $re;
}

#pod =method TO_JSON
#pod
#pod If the C option is true, returns a hashref compatible with
#pod MongoDB's L
#pod format, which represents it as a document as follows:
#pod
#pod     {"$regularExpression" : { pattern: "", "options" : ""} }
#pod
#pod If the C option is false, an error is thrown, as this value
#pod can't otherwise be represented in JSON.
#pod
#pod =cut

sub TO_JSON {
    if ( $ENV{BSON_EXTJSON} ) {
        my %data;
        tie( %data, 'Tie::IxHash' );
        $data{pattern} = $_[0]->{pattern};
        $data{options} = $_[0]->{flags};
        return {
            '$regularExpression' => \%data,
        };
    }

    Carp::croak( "The value '$_[0]' is illegal in JSON" );
}


1;

=pod

=encoding UTF-8

=head1 NAME

BSON::Regex - BSON type wrapper for regular expressions

=head1 VERSION

version v1.12.0

=head1 SYNOPSIS

    use BSON::Types ':all';

    $regex = bson_regex( $pattern );
    $regex = bson_regex( $pattern, $flags );

=head1 DESCRIPTION

This module provides a BSON type wrapper for a PCRE regular expression and
optional flags.

=head1 ATTRIBUTES

=head2 pattern

A B containing a PCRE regular expression pattern (not a C object
and without slashes).  Default is the empty string.

=head2 flags

A string with regular expression flags.  Flags will be sorted and
duplicates will be removed during object construction.  Supported flags
include C.  Invalid flags will cause an exception.
Default is the empty string.

=head1 METHODS

=head2 try_compile

    my $qr = $regexp->try_compile;

Tries to compile the C and C into a reference to a regular
expression.  If the pattern or flags can't be compiled, a
exception will be thrown.

B: Executing a regular expression can evaluate arbitrary
code if the L 'eval' pragma is in force.  You are strongly advised
to read L and never to use untrusted input with C.

=head2 TO_JSON

If the C option is true, returns a hashref compatible with
MongoDB's L
format, which represents it as a document as follows:

    {"$regularExpression" : { pattern: "", "options" : ""} }

If the C option is false, an error is thrown, as this value
can't otherwise be represented in JSON.

=for Pod::Coverage BUILD

=head1 AUTHORS

=over 4

=item *

David Golden

=item *

Stefan G.

=back

=head1 COPYRIGHT AND LICENSE

This software is Copyright (c) 2019 by Stefan G. and MongoDB, Inc.

This is free software, licensed under:

  The Apache License, Version 2.0, January 2004

=cut

__END__