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local/lib/perl5/YAML/Tiny.pm  view on Meta::CPAN

    # Iterate over the documents
    my $indent = 0;
    my @lines  = ();

    eval {
        foreach my $cursor ( @$self ) {
            push @lines, '---';

            # An empty document
            if ( ! defined $cursor ) {
                # Do nothing

            # A scalar document
            } elsif ( ! ref $cursor ) {
                $lines[-1] .= ' ' . $self->_dump_scalar( $cursor );

            # A list at the root
            } elsif ( ref $cursor eq 'ARRAY' ) {
                unless ( @$cursor ) {
                    $lines[-1] .= ' []';
                    next;
                }
                push @lines, $self->_dump_array( $cursor, $indent, {} );

            # A hash at the root
            } elsif ( ref $cursor eq 'HASH' ) {
                unless ( %$cursor ) {
                    $lines[-1] .= ' {}';
                    next;
                }
                push @lines, $self->_dump_hash( $cursor, $indent, {} );

            } else {
                die \("Cannot serialize " . ref($cursor));
            }
        }
    };
    if ( ref $@ eq 'SCALAR' ) {
        $self->_error(${$@});
    } elsif ( $@ ) {
        $self->_error($@);
    }

    join '', map { "$_\n" } @lines;
}

sub _has_internal_string_value {
    my $value = shift;
    my $b_obj = B::svref_2object(\$value);  # for round trip problem
    return $b_obj->FLAGS & B::SVf_POK();
}

sub _dump_scalar {
    my $string = $_[1];
    my $is_key = $_[2];
    # Check this before checking length or it winds up looking like a string!
    my $has_string_flag = _has_internal_string_value($string);
    return '~'  unless defined $string;
    return "''" unless length  $string;
    if (Scalar::Util::looks_like_number($string)) {
        # keys and values that have been used as strings get quoted
        if ( $is_key || $has_string_flag ) {
            return qq['$string'];
        }
        else {
            return $string;
        }
    }
    if ( $string =~ /[\x00-\x09\x0b-\x0d\x0e-\x1f\x7f-\x9f\'\n]/ ) {
        $string =~ s/\\/\\\\/g;
        $string =~ s/"/\\"/g;
        $string =~ s/\n/\\n/g;
        $string =~ s/[\x85]/\\N/g;
        $string =~ s/([\x00-\x1f])/\\$UNPRINTABLE[ord($1)]/g;
        $string =~ s/([\x7f-\x9f])/'\x' . sprintf("%X",ord($1))/ge;
        return qq|"$string"|;
    }
    if ( $string =~ /(?:^[~!@#%&*|>?:,'"`{}\[\]]|^-+$|\s|:\z)/ or
        $QUOTE{$string}
    ) {
        return "'$string'";
    }
    return $string;
}

sub _dump_array {
    my ($self, $array, $indent, $seen) = @_;
    if ( $seen->{refaddr($array)}++ ) {
        die \"YAML::Tiny does not support circular references";
    }
    my @lines  = ();
    foreach my $el ( @$array ) {
        my $line = ('  ' x $indent) . '-';
        my $type = ref $el;
        if ( ! $type ) {
            $line .= ' ' . $self->_dump_scalar( $el );
            push @lines, $line;

        } elsif ( $type eq 'ARRAY' ) {
            if ( @$el ) {
                push @lines, $line;
                push @lines, $self->_dump_array( $el, $indent + 1, $seen );
            } else {
                $line .= ' []';
                push @lines, $line;
            }

        } elsif ( $type eq 'HASH' ) {
            if ( keys %$el ) {
                push @lines, $line;
                push @lines, $self->_dump_hash( $el, $indent + 1, $seen );
            } else {
                $line .= ' {}';
                push @lines, $line;
            }

        } else {
            die \"YAML::Tiny does not support $type references";
        }
    }