File Coverage

blib/lib/JSON.pm

Criterion	Covered	Total	%
statement	134	165	81.2
branch	37	70	52.8
condition	12	28	42.8
subroutine	30	33	90.9
pod	10	14	71.4
total	223	310	71.9

package JSON;


use strict;
use Carp ();
use Exporter;
BEGIN { @JSON::ISA = 'Exporter' }

@JSON::EXPORT = qw(from_json to_json jsonToObj objToJson encode_json decode_json);

BEGIN {
    $JSON::VERSION = '4.08';
    $JSON::DEBUG   = 0 unless (defined $JSON::DEBUG);
    $JSON::DEBUG   = $ENV{ PERL_JSON_DEBUG } if exists $ENV{ PERL_JSON_DEBUG };
}

my %RequiredVersion = (
    'JSON::PP' => '2.27203',
    'JSON::XS' => '2.34',
);

# XS and PP common methods

my @PublicMethods = qw/
    ascii latin1 utf8 pretty indent space_before space_after relaxed canonical allow_nonref
    allow_blessed convert_blessed filter_json_object filter_json_single_key_object
    shrink max_depth max_size encode decode decode_prefix allow_unknown
/;

my @Properties = qw/
    ascii latin1 utf8 indent space_before space_after relaxed canonical allow_nonref
    allow_blessed convert_blessed shrink max_depth max_size allow_unknown
/;

my @XSOnlyMethods = qw//; # Currently nothing

my @PublicMethodsSince4_0 = qw/allow_tags/;
my @PropertiesSince4_0 = qw/allow_tags/;

my @PPOnlyMethods = qw/
    indent_length sort_by
    allow_singlequote allow_bignum loose allow_barekey escape_slash as_nonblessed
/; # JSON::PP specific


# used in _load_xs and _load_pp ($INSTALL_ONLY is not used currently)
my $_INSTALL_DONT_DIE  = 1; # When _load_xs fails to load XS, don't die.
my $_ALLOW_UNSUPPORTED = 0;
my $_UNIV_CONV_BLESSED = 0;


# Check the environment variable to decide worker module.

unless ($JSON::Backend) {
    $JSON::DEBUG and  Carp::carp("Check used worker module...");

    my $backend = exists $ENV{PERL_JSON_BACKEND} ? $ENV{PERL_JSON_BACKEND} : 1;

    if ($backend eq '1') {
        $backend = 'JSON::XS,JSON::PP';
    }
    elsif ($backend eq '0') {
        $backend = 'JSON::PP';
    }
    elsif ($backend eq '2') {
        $backend = 'JSON::XS';
    }
    $backend =~ s/\s+//g;

    my @backend_modules = split /,/, $backend;
    while(my $module = shift @backend_modules) {
        if ($module =~ /JSON::XS/) {
            _load_xs($module, @backend_modules ? $_INSTALL_DONT_DIE : 0);
        }
        elsif ($module =~ /JSON::PP/) {
            _load_pp($module);
        }
        elsif ($module =~ /JSON::backportPP/) {
            _load_pp($module);
        }
        else {
            Carp::croak "The value of environmental variable 'PERL_JSON_BACKEND' is invalid.";
        }
        last if $JSON::Backend;
    }
}


sub import {
    my $pkg = shift;
    my @what_to_export;
    my $no_export;

    for my $tag (@_) {
        if ($tag eq '-support_by_pp') {
            if (!$_ALLOW_UNSUPPORTED++) {
                JSON::Backend::XS
                    ->support_by_pp(@PPOnlyMethods) if ($JSON::Backend->is_xs);
            }
            next;
        }
        elsif ($tag eq '-no_export') {
            $no_export++, next;
        }
        elsif ( $tag eq '-convert_blessed_universally' ) {
            my $org_encode = $JSON::Backend->can('encode');
            eval q|
                require B;
                local $^W;
                no strict 'refs';
                *{"${JSON::Backend}\::encode"} = sub {
                    # only works with Perl 5.18+
                    local *UNIVERSAL::TO_JSON = sub {
                        my $b_obj = B::svref_2object( $_[0] );
                        return    $b_obj->isa('B::HV') ? { %{ $_[0] } }
                                : $b_obj->isa('B::AV') ? [ @{ $_[0] } ]
                                : undef
                                ;
                    };
                    $org_encode->(@_);
                };
            | if ( !$_UNIV_CONV_BLESSED++ );
            next;
        }
        push @what_to_export, $tag;
    }

    return if ($no_export);

    __PACKAGE__->export_to_level(1, $pkg, @what_to_export);
}


# OBSOLETED

sub jsonToObj {
    my $alternative = 'from_json';
    if (defined $_[0] and UNIVERSAL::isa($_[0], 'JSON')) {
        shift @_; $alternative = 'decode';
    }
    Carp::carp "'jsonToObj' will be obsoleted. Please use '$alternative' instead.";
    return JSON::from_json(@_);
};

sub objToJson {
    my $alternative = 'to_json';
    if (defined $_[0] and UNIVERSAL::isa($_[0], 'JSON')) {
        shift @_; $alternative = 'encode';
    }
    Carp::carp "'objToJson' will be obsoleted. Please use '$alternative' instead.";
    JSON::to_json(@_);
};


# INTERFACES

sub to_json ($@) {
    if (
        ref($_[0]) eq 'JSON'
        or (@_ > 2 and $_[0] eq 'JSON')
    ) {
        Carp::croak "to_json should not be called as a method.";
    }
    my $json = JSON->new;

    if (@_ == 2 and ref $_[1] eq 'HASH') {
        my $opt  = $_[1];
        for my $method (keys %$opt) {
            $json->$method( $opt->{$method} );
        }
    }

    $json->encode($_[0]);
}


sub from_json ($@) {
    if ( ref($_[0]) eq 'JSON' or $_[0] eq 'JSON' ) {
        Carp::croak "from_json should not be called as a method.";
    }
    my $json = JSON->new;

    if (@_ == 2 and ref $_[1] eq 'HASH') {
        my $opt  = $_[1];
        for my $method (keys %$opt) {
            $json->$method( $opt->{$method} );
        }
    }

    return $json->decode( $_[0] );
}



sub true  { $JSON::true  }

sub false { $JSON::false }

sub boolean {
    # might be called as method or as function, so pop() to get the last arg instead of shift() to get the first
    pop() ? $JSON::true : $JSON::false
}

sub null  { undef; }


sub require_xs_version { $RequiredVersion{'JSON::XS'}; }

sub backend {
    my $proto = shift;
    $JSON::Backend;
}

#*module = *backend;


sub is_xs {
    return $_[0]->backend->is_xs;
}


sub is_pp {
    return $_[0]->backend->is_pp;
}


sub pureperl_only_methods { @PPOnlyMethods; }


sub property {
    my ($self, $name, $value) = @_;

    if (@_ == 1) {
        my %props;
        for $name (@Properties) {
            my $method = 'get_' . $name;
            if ($name eq 'max_size') {
                my $value = $self->$method();
                $props{$name} = $value == 1 ? 0 : $value;
                next;
            }
            $props{$name} = $self->$method();
        }
        return \%props;
    }
    elsif (@_ > 3) {
        Carp::croak('property() can take only the option within 2 arguments.');
    }
    elsif (@_ == 2) {
        if ( my $method = $self->can('get_' . $name) ) {
            if ($name eq 'max_size') {
                my $value = $self->$method();
                return $value == 1 ? 0 : $value;
            }
            $self->$method();
        }
    }
    else {
        $self->$name($value);
    }

}



# INTERNAL

sub __load_xs {
    my ($module, $opt) = @_;

    $JSON::DEBUG and Carp::carp "Load $module.";
    my $required_version = $RequiredVersion{$module} || '';

    eval qq|
        use $module $required_version ();
    |;

    if ($@) {
        if (defined $opt and $opt & $_INSTALL_DONT_DIE) {
            $JSON::DEBUG and Carp::carp "Can't load $module...($@)";
            return 0;
        }
        Carp::croak $@;
    }
    $JSON::BackendModuleXS = $module;
    return 1;
}

sub _load_xs {
    my ($module, $opt) = @_;
    __load_xs($module, $opt) or return;

    my $data = join("", ); # this code is from Jcode 2.xx.
    close(DATA);
    eval $data;
    JSON::Backend::XS->init($module);

    return 1;
};


sub __load_pp {
    my ($module, $opt) = @_;

    $JSON::DEBUG and Carp::carp "Load $module.";
    my $required_version = $RequiredVersion{$module} || '';

    eval qq| use $module $required_version () |;

    if ($@) {
        if ( $module eq 'JSON::PP' ) {
            $JSON::DEBUG and Carp::carp "Can't load $module ($@), so try to load JSON::backportPP";
            $module = 'JSON::backportPP';
            local $^W; # if PP installed but invalid version, backportPP redefines methods.
            eval qq| require $module |;
        }
        Carp::croak $@ if $@;
    }
    $JSON::BackendModulePP = $module;
    return 1;
}

sub _load_pp {
    my ($module, $opt) = @_;
    __load_pp($module, $opt);

    JSON::Backend::PP->init($module);
};

#
# Helper classes for Backend Module (PP)
#

package JSON::Backend::PP;

sub init {
    my ($class, $module) = @_;

    # name may vary, but the module should (always) be a JSON::PP

    local $^W;
    no strict qw(refs); # this routine may be called after JSON::Backend::XS init was called.
    *{"JSON::decode_json"} = \&{"JSON::PP::decode_json"};
    *{"JSON::encode_json"} = \&{"JSON::PP::encode_json"};
    *{"JSON::is_bool"} = \&{"JSON::PP::is_bool"};

    $JSON::true  = ${"JSON::PP::true"};
    $JSON::false = ${"JSON::PP::false"};

    push @JSON::Backend::PP::ISA, 'JSON::PP';
    push @JSON::ISA, $class;
    $JSON::Backend = $class;
    $JSON::BackendModule = $module;
    my $version = ${"$class\::VERSION"} = $module->VERSION;
    $version =~ s/_//;
    if ($version < 3.99) {
        push @XSOnlyMethods, qw/allow_tags get_allow_tags/;
    } else {
        push @Properties, 'allow_tags';
    }

    for my $method (@XSOnlyMethods) {
        *{"JSON::$method"} = sub {
            Carp::carp("$method is not supported by $module $version.");
            $_[0];
        };
    }

    return 1;
}

sub is_xs { 0 };
sub is_pp { 1 };

#
# To save memory, the below lines are read only when XS backend is used.
#

package JSON;

1;
__DATA__