common/tools/raptor/XML/SAX/PurePerl/Reader/Stream.pm
author MattD <mattd@symbian.org>
Tue, 04 Aug 2009 14:40:11 +0100
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raptor parser.pl - adding XML::SAX perl modules (public domain code - http://www.saxproject.org/faq.html) so we don't have to patch up every single build machine.
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# $Id: Stream.pm,v 1.7 2005/10/14 20:31:20 matt Exp $
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package XML::SAX::PurePerl::Reader::Stream;
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use strict;
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use vars qw(@ISA);
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use XML::SAX::PurePerl::Reader qw(
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    EOF
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    BUFFER
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    LINE
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    COLUMN
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    ENCODING
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    XML_VERSION
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);
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use XML::SAX::Exception;
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@ISA = ('XML::SAX::PurePerl::Reader');
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# subclassed by adding 1 to last element
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use constant FH => 8;
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use constant BUFFER_SIZE => 4096;
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sub new {
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    my $class = shift;
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    my $ioref = shift;
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    XML::SAX::PurePerl::Reader::set_raw_stream($ioref);
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    my @parts;
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    @parts[FH, LINE, COLUMN, BUFFER, EOF, XML_VERSION] =
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        ($ioref, 1,   0,      '',     0,   '1.0');
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    return bless \@parts, $class;
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}
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sub read_more {
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    my $self = shift;
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    my $buf;
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    my $bytesread = read($self->[FH], $buf, BUFFER_SIZE);
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    if ($bytesread) {
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        $self->[BUFFER] .= $buf;
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        return 1;
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    }
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    elsif (defined($bytesread)) {
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        $self->[EOF]++;
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        return 0;
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    }
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    else {
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        throw XML::SAX::Exception::Parse(
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            Message => "Error reading from filehandle: $!",
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        );
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    }
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}
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sub move_along {
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    my $self = shift;
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    my $discarded = substr($self->[BUFFER], 0, $_[0], '');
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    # Wish I could skip this lot - tells us where we are in the file
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    my $lines = $discarded =~ tr/\n//;
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    $self->[LINE] += $lines;
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    if ($lines) {
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        $discarded =~ /\n([^\n]*)$/;
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        $self->[COLUMN] = length($1);
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    }
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    else {
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        $self->[COLUMN] += $_[0];
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    }
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}
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sub set_encoding {
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    my $self = shift;
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    my ($encoding) = @_;
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    # warn("set encoding to: $encoding\n");
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    XML::SAX::PurePerl::Reader::switch_encoding_stream($self->[FH], $encoding);
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    XML::SAX::PurePerl::Reader::switch_encoding_string($self->[BUFFER], $encoding);
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    $self->[ENCODING] = $encoding;
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}
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sub bytepos {
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    my $self = shift;
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    tell($self->[FH]);
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}
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1;
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