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package XML::Struct::Writer::Stream;
use strict;
use Moo;
our $VERSION = '0.27';
has fh => (is => 'rw', default => sub { *STDOUT });
has pretty => (is => 'rw');
our %ESCAPE = (
'&' => '&',
'<' => '<',
'>' => '>',
'"' => '"',
);
use constant {
DOCUMENT_STARTED => 0,
TAG_STARTED => 1,
CHAR_CONTENT => 2,
CHILD_ELEMENT => 3,
};
sub xml_decl {
my ($self, $data) = @_;
my $xml = "<?xml version=\"$data->{Version}\"";
$xml .= " encoding=\"$data->{Encoding}\"" if $data->{Encoding};
$xml .= " standalone=\"$data->{Standalone}\"" if $data->{Standalone};
$xml .= "?>\n";
print {$self->fh} $xml;
}
sub start_document {
my ($self) = @_;
$self->{_stack} = [];
$self->{_status} = DOCUMENT_STARTED;
}
sub start_element {
my ($self, $data) = @_;
my $tag = $data->{Name};
my $attr = $data->{Attributes};
my $xml = "<$tag";
my $status = $self->{_status} // DOCUMENT_STARTED;
if ($status == TAG_STARTED) {
print {$self->fh} '>';
if ($self->pretty) {
print {$self->fh} "\n".(' ' x (scalar @{$self->{_stack}}));
}
} elsif ($status == CHILD_ELEMENT) {
if ($self->pretty) {
print {$self->fh} "\n".(' ' x (scalar @{$self->{_stack}}));
}
} elsif ($status == CHAR_CONTENT) {
print {$self->fh} $self->{_chars};
} # else: DOCUMENT_STARTED
push @{$self->{_stack}}, $tag;
if ($attr && %$attr) {
foreach my $key (sort keys %$attr) {
my $value = $attr->{$key};
$value =~ s/([&<>"])/$ESCAPE{$1}/geo;
$xml .= " $key=\"$value\"";
}
}
$self->{_status} = TAG_STARTED;
print {$self->fh} $xml;
}
sub end_element {
my ($self) = @_;
my $tag = pop @{$self->{_stack}} or return;
if ($self->{_status} == TAG_STARTED) {
print {$self->fh} '/>';
} elsif ($self->{_status} == CHAR_CONTENT) {
print {$self->fh} $self->{_chars} . "</$tag>";
$self->{_chars} = "";
} else { # CHILD_ELEMENT
if ($self->pretty) {
print {$self->fh} "\n".(' ' x (scalar @{$self->{_stack}}));
}
print {$self->fh} "</$tag>";
}
$self->{_status} = CHILD_ELEMENT;
}
sub characters {
my ($self, $data) = @_;
my $xml = $data->{Data};
$xml =~ s/([&<>])/$ESCAPE{$1}/geo;
if ($self->{_status} == TAG_STARTED) {
print {$self->fh} '>';
$self->{_status} = CHAR_CONTENT;
$self->{_chars} = $xml;
} elsif ($self->{_status} == CHILD_ELEMENT) {
print {$self->fh} $xml;
} else {
$self->{_chars} .= $xml;
}
}
sub end_document {
my ($self) = @_;
$self->end_element while @{$self->{_stack}};
print {$self->fh} "\n";
}
1;
__END__
=head1 NAME
XML::Struct::Writer::Stream - simplified SAX handler to serialize (Micro)XML
=head1 DESCRIPTION
This class implements a simplfied SAX handler for stream-based serialization
of XML. DTDs, comments, processing instructions and similar features not part
of MicroXML are not supported.
The handler is written to reproduce the serialization of libxml.
=head1 CONFIGURATION
=over
=item fh
File handle or compatible object to write to (standard output by default).
=item pretty
Pretty-print XML if enabled.
=back
=head1 SEE ALSO
See L<XML::SAX::Writer>, L<XML::Genx::SAXWriter>, and L<XML::Handler::YAWriter>
for more elaborated SAX writers and L<XML::Writer> for a general XML writer,
not based on SAX.
=cut
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