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# $Id: XMLDecl.pm,v 1.3 2003-07-30 13:39:22 matt Exp $
package XML::SAX::PurePerl;
use strict;
use XML::SAX::PurePerl::Productions qw($S $VersionNum $EncNameStart $EncNameEnd);
sub XMLDecl {
my ($self, $reader) = @_;
my $data = $reader->data(5);
# warn("Looking for xmldecl in: $data");
if ($data =~ /^<\?xml$S/o) {
$reader->move_along(5);
$self->skip_whitespace($reader);
# get version attribute
$self->VersionInfo($reader) ||
$self->parser_error("XML Declaration lacks required version attribute, or version attribute does not match XML specification", $reader);
if (!$self->skip_whitespace($reader)) {
my $data = $reader->data(2);
$data =~ /^\?>/ or $self->parser_error("Syntax error", $reader);
$reader->move_along(2);
return;
}
if ($self->EncodingDecl($reader)) {
if (!$self->skip_whitespace($reader)) {
my $data = $reader->data(2);
$data =~ /^\?>/ or $self->parser_error("Syntax error", $reader);
$reader->move_along(2);
return;
}
}
$self->SDDecl($reader);
$self->skip_whitespace($reader);
my $data = $reader->data(2);
$data =~ /^\?>/ or $self->parser_error("Syntax error", $reader);
$reader->move_along(2);
}
else {
# warn("first 5 bytes: ", join(',', unpack("CCCCC", $data)), "\n");
# no xml decl
if (!$reader->get_encoding) {
$reader->set_encoding("UTF-8");
}
}
}
sub VersionInfo {
my ($self, $reader) = @_;
my $data = $reader->data(11);
# warn("Looking for version in $data");
$data =~ /^(version$S*=$S*(["'])($VersionNum)\2)/o or return 0;
$reader->move_along(length($1));
my $vernum = $3;
if ($vernum ne "1.0") {
$self->parser_error("Only XML version 1.0 supported. Saw: '$vernum'", $reader);
}
return 1;
}
sub SDDecl {
my ($self, $reader) = @_;
my $data = $reader->data(15);
$data =~ /^(standalone$S*=$S*(["'])(yes|no)\2)/o or return 0;
$reader->move_along(length($1));
my $yesno = $3;
if ($yesno eq 'yes') {
$self->{standalone} = 1;
}
else {
$self->{standalone} = 0;
}
return 1;
}
sub EncodingDecl {
my ($self, $reader) = @_;
my $data = $reader->data(12);
$data =~ /^(encoding$S*=$S*(["'])($EncNameStart$EncNameEnd*)\2)/o or return 0;
$reader->move_along(length($1));
my $encoding = $3;
$reader->set_encoding($encoding);
return 1;
}
sub TextDecl {
my ($self, $reader) = @_;
my $data = $reader->data(6);
$data =~ /^<\?xml$S+/ or return;
$reader->move_along(5);
$self->skip_whitespace($reader);
if ($self->VersionInfo($reader)) {
$self->skip_whitespace($reader) ||
$self->parser_error("Lack of whitespace after version attribute in text declaration", $reader);
}
$self->EncodingDecl($reader) ||
$self->parser_error("Encoding declaration missing from external entity text declaration", $reader);
$self->skip_whitespace($reader);
$data = $reader->data(2);
$data =~ /^\?>/ or $self->parser_error("Syntax error", $reader);
return 1;
}
1;
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