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package XML::Struct::Writer::Stream; |
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use strict; |
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use Moo; |
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our $VERSION = '0.27'; |
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has fh => (is => 'rw', default => sub { *STDOUT }); |
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has pretty => (is => 'rw'); |
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our %ESCAPE = ( |
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'&' => '&', |
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'<' => '<', |
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'>' => '>', |
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'"' => '"', |
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); |
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use constant { |
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DOCUMENT_STARTED => 0, |
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TAG_STARTED => 1, |
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CHAR_CONTENT => 2, |
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CHILD_ELEMENT => 3, |
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}; |
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sub xml_decl { |
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my ($self, $data) = @_; |
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3
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my $xml = "<?xml version=\"$data->{Version}\""; |
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$xml .= " encoding=\"$data->{Encoding}\"" if $data->{Encoding}; |
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$xml .= " standalone=\"$data->{Standalone}\"" if $data->{Standalone}; |
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$xml .= "?>\n"; |
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print {$self->fh} $xml; |
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} |
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sub start_document { |
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my ($self) = @_; |
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$self->{_stack} = []; |
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$self->{_status} = DOCUMENT_STARTED; |
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} |
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sub start_element { |
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my ($self, $data) = @_; |
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my $tag = $data->{Name}; |
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my $attr = $data->{Attributes}; |
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my $xml = "<$tag"; |
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my $status = $self->{_status} // DOCUMENT_STARTED; |
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100
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if ($status == TAG_STARTED) { |
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100
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100
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print {$self->fh} '>'; |
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100
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if ($self->pretty) { |
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1
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print {$self->fh} "\n".(' ' x (scalar @{$self->{_stack}})); |
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1
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} |
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} elsif ($status == CHILD_ELEMENT) { |
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100
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if ($self->pretty) { |
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print {$self->fh} "\n".(' ' x (scalar @{$self->{_stack}})); |
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1
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57
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} |
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} elsif ($status == CHAR_CONTENT) { |
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print {$self->fh} $self->{_chars}; |
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60
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} # else: DOCUMENT_STARTED |
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push @{$self->{_stack}}, $tag; |
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96
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64
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100
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if ($attr && %$attr) { |
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foreach my $key (sort keys %$attr) { |
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my $value = $attr->{$key}; |
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$value =~ s/([&<>"])/$ESCAPE{$1}/geo; |
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0
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$xml .= " $key=\"$value\""; |
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} |
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} |
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$self->{_status} = TAG_STARTED; |
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print {$self->fh} $xml; |
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156
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75
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} |
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sub end_element { |
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36
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0
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my ($self) = @_; |
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80
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my $tag = pop @{$self->{_stack}} or return; |
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100
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if ($self->{_status} == TAG_STARTED) { |
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100
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print {$self->fh} '/>'; |
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} elsif ($self->{_status} == CHAR_CONTENT) { |
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print {$self->fh} $self->{_chars} . "</$tag>"; |
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86
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$self->{_chars} = ""; |
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} else { # CHILD_ELEMENT |
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100
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if ($self->pretty) { |
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1
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print {$self->fh} "\n".(' ' x (scalar @{$self->{_stack}})); |
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1
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90
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} |
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print {$self->fh} "</$tag>"; |
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} |
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$self->{_status} = CHILD_ELEMENT; |
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} |
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sub characters { |
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my ($self, $data) = @_; |
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100
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16
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my $xml = $data->{Data}; |
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$xml =~ s/([&<>])/$ESCAPE{$1}/geo; |
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0
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103
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100
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if ($self->{_status} == TAG_STARTED) { |
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print {$self->fh} '>'; |
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105
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$self->{_status} = CHAR_CONTENT; |
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$self->{_chars} = $xml; |
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} elsif ($self->{_status} == CHILD_ELEMENT) { |
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print {$self->fh} $xml; |
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109
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} else { |
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$self->{_chars} .= $xml; |
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} |
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} |
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114
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sub end_document { |
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my ($self) = @_; |
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$self->end_element while @{$self->{_stack}}; |
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117
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print {$self->fh} "\n"; |
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41
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118
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} |
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120
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121
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1; |
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__END__ |
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=head1 NAME |
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XML::Struct::Writer::Stream - simplified SAX handler to serialize (Micro)XML |
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128
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=head1 DESCRIPTION |
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This class implements a simplfied SAX handler for stream-based serialization |
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of XML. DTDs, comments, processing instructions and similar features not part |
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of MicroXML are not supported. |
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134
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The handler is written to reproduce the serialization of libxml. |
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136
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=head1 CONFIGURATION |
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138
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=over |
139
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140
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=item fh |
141
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142
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File handle or compatible object to write to (standard output by default). |
143
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144
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=item pretty |
145
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146
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Pretty-print XML if enabled. |
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148
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=back |
149
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150
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=head1 SEE ALSO |
151
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152
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See L<XML::SAX::Writer>, L<XML::Genx::SAXWriter>, and L<XML::Handler::YAWriter> |
153
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for more elaborated SAX writers and L<XML::Writer> for a general XML writer, |
154
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not based on SAX. |
155
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156
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=cut |