1 # $Id: Stream.pm,v 1.7 2005/10/14 20:31:20 matt Exp $

     2 

     3 package XML::SAX::PurePerl::Reader::Stream;

     4 

     5 use strict;

     6 use vars qw(@ISA);

     7 

     8 use XML::SAX::PurePerl::Reader qw(

     9     EOF

    10     BUFFER

    11     LINE

    12     COLUMN

    13     ENCODING

    14     XML_VERSION

    15 );

    16 use XML::SAX::Exception;

    17 

    18 @ISA = ('XML::SAX::PurePerl::Reader');

    19 

    20 # subclassed by adding 1 to last element

    21 use constant FH => 8;

    22 use constant BUFFER_SIZE => 4096;

    23 

    24 sub new {

    25     my $class = shift;

    26     my $ioref = shift;

    27     XML::SAX::PurePerl::Reader::set_raw_stream($ioref);

    28     my @parts;

    29     @parts[FH, LINE, COLUMN, BUFFER, EOF, XML_VERSION] =

    30         ($ioref, 1,   0,      '',     0,   '1.0');

    31     return bless \@parts, $class;

    32 }

    33 

    34 sub read_more {

    35     my $self = shift;

    36     my $buf;

    37     my $bytesread = read($self->[FH], $buf, BUFFER_SIZE);

    38     if ($bytesread) {

    39         $self->[BUFFER] .= $buf;

    40         return 1;

    41     }

    42     elsif (defined($bytesread)) {

    43         $self->[EOF]++;

    44         return 0;

    45     }

    46     else {

    47         throw XML::SAX::Exception::Parse(

    48             Message => "Error reading from filehandle: $!",

    49         );

    50     }

    51 }

    52 

    53 sub move_along {

    54     my $self = shift;

    55     my $discarded = substr($self->[BUFFER], 0, $_[0], '');

    56     

    57     # Wish I could skip this lot - tells us where we are in the file

    58     my $lines = $discarded =~ tr/\n//;

    59     $self->[LINE] += $lines;

    60     if ($lines) {

    61         $discarded =~ /\n([^\n]*)$/;

    62         $self->[COLUMN] = length($1);

    63     }

    64     else {

    65         $self->[COLUMN] += $_[0];

    66     }

    67 }

    68 

    69 sub set_encoding {

    70     my $self = shift;

    71     my ($encoding) = @_;

    72     # warn("set encoding to: $encoding\n");

    73     XML::SAX::PurePerl::Reader::switch_encoding_stream($self->[FH], $encoding);

    74     XML::SAX::PurePerl::Reader::switch_encoding_string($self->[BUFFER], $encoding);

    75     $self->[ENCODING] = $encoding;

    76 }

    77 

    78 sub bytepos {

    79     my $self = shift;

    80     tell($self->[FH]);

    81 }

    82 

    83 1;

    84