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t/lib/IO/String.pm  view on Meta::CPAN

}

sub open
{
    my $self = shift;
    return $self->new(@_) unless ref($self);

    if (@_) {
	my $bufref = ref($_[0]) ? $_[0] : \$_[0];
	$$bufref = "" unless defined $$bufref;
	*$self->{buf} = $bufref;
    }
    else {
	my $buf = "";
	*$self->{buf} = \$buf;
    }
    *$self->{pos} = 0;
    *$self->{lno} = 0;
    return $self;
}

sub pad
{
    my $self = shift;
    my $old = *$self->{pad};
    *$self->{pad} = substr($_[0], 0, 1) if @_;
    return "\0" unless defined($old) && length($old);
    return $old;
}

sub dump
{
    require Data::Dumper;
    my $self = shift;
    print Data::Dumper->Dump([$self], ['*self']);
    print Data::Dumper->Dump([*$self{HASH}], ['$self{HASH}']);
    return;
}

sub TIEHANDLE
{
    print "TIEHANDLE @_\n" if $DEBUG;
    return $_[0] if ref($_[0]);
    my $class = shift;
    my $self = bless Symbol::gensym(), $class;
    $self->open(@_);
    return $self;
}

sub DESTROY
{
    print "DESTROY @_\n" if $DEBUG;
}

sub close
{
    my $self = shift;
    delete *$self->{buf};
    delete *$self->{pos};
    delete *$self->{lno};
    undef *$self if $] eq "5.008";  # workaround for some bug
    return 1;
}

sub opened
{
    my $self = shift;
    return defined *$self->{buf};
}

sub binmode
{
    my $self = shift;
    return 1 unless @_;
    # XXX don't know much about layers yet :-(
    return 0;
}

sub getc
{
    my $self = shift;
    my $buf;
    return $buf if $self->read($buf, 1);
    return undef;
}

sub ungetc
{
    my $self = shift;
    $self->setpos($self->getpos() - 1);
    return 1;
}

sub eof
{
    my $self = shift;
    return length(${*$self->{buf}}) <= *$self->{pos};
}

sub print
{
    my $self = shift;
    if (defined $\) {
	if (defined $,) {
	    $self->write(join($,, @_).$\);
	}
	else {
	    $self->write(join("",@_).$\);
	}
    }
    else {
	if (defined $,) {
	    $self->write(join($,, @_));
	}
	else {
	    $self->write(join("",@_));
	}
    }
    return 1;
}
*printflush = \*print;

sub printf
{
    my $self = shift;
    print "PRINTF(@_)\n" if $DEBUG;
    my $fmt = shift;
    $self->write(sprintf($fmt, @_));
    return 1;
}


my($SEEK_SET, $SEEK_CUR, $SEEK_END);

sub _init_seek_constants
{
    if ($IO_CONSTANTS) {
	require IO::Handle;
	$SEEK_SET = &IO::Handle::SEEK_SET;
	$SEEK_CUR = &IO::Handle::SEEK_CUR;
	$SEEK_END = &IO::Handle::SEEK_END;
    }
    else {
	$SEEK_SET = 0;

t/lib/IO/String.pm  view on Meta::CPAN

	    $para .= $c;
	}
	return $para;   # XXX wantarray
    }

    my $idx = index($$buf,$/,$pos);
    if ($idx < 0) {
	# return rest of it
	*$self->{pos} = $len;
	$. = ++ *$self->{lno};
	return substr($$buf, $pos);
    }
    $len = $idx - $pos + length($/);
    *$self->{pos} += $len;
    $. = ++ *$self->{lno};
    return substr($$buf, $pos, $len);
}

sub getlines
{
    die "getlines() called in scalar context\n" unless wantarray;
    my $self = shift;
    my($line, @lines);
    push(@lines, $line) while defined($line = $self->getline);
    return @lines;
}

sub READLINE
{
    goto &getlines if wantarray;
    goto &getline;
}

sub input_line_number
{
    my $self = shift;
    my $old = *$self->{lno};
    *$self->{lno} = shift if @_;
    return $old;
}

sub truncate
{
    my $self = shift;
    my $len = shift || 0;
    my $buf = *$self->{buf};
    if (length($$buf) >= $len) {
	substr($$buf, $len) = '';
	*$self->{pos} = $len if $len < *$self->{pos};
    }
    else {
	$$buf .= ($self->pad x ($len - length($$buf)));
    }
    return 1;
}

sub read
{
    my $self = shift;
    my $buf = *$self->{buf};
    return undef unless $buf;

    my $pos = *$self->{pos};
    my $rem = length($$buf) - $pos;
    my $len = $_[1];
    $len = $rem if $len > $rem;
    return undef if $len < 0;
    if (@_ > 2) { # read offset
	substr($_[0],$_[2]) = substr($$buf, $pos, $len);
    }
    else {
	$_[0] = substr($$buf, $pos, $len);
    }
    *$self->{pos} += $len;
    return $len;
}

sub write
{
    my $self = shift;
    my $buf = *$self->{buf};
    return unless $buf;

    my $pos = *$self->{pos};
    my $slen = length($_[0]);
    my $len = $slen;
    my $off = 0;
    if (@_ > 1) {
	$len = $_[1] if $_[1] < $len;
	if (@_ > 2) {
	    $off = $_[2] || 0;
	    die "Offset outside string" if $off > $slen;
	    if ($off < 0) {
		$off += $slen;
		die "Offset outside string" if $off < 0;
	    }
	    my $rem = $slen - $off;
	    $len = $rem if $rem < $len;
	}
    }
    substr($$buf, $pos, $len) = substr($_[0], $off, $len);
    *$self->{pos} += $len;
    return $len;
}

*sysread = \&read;
*syswrite = \&write;

sub stat
{
    my $self = shift;
    return unless $self->opened;
    return 1 unless wantarray;
    my $len = length ${*$self->{buf}};

    return (
     undef, undef,  # dev, ino
     0666,          # filemode
     1,             # links
     $>,            # user id
     $),            # group id
     undef,         # device id
     $len,          # size
     undef,         # atime
     undef,         # mtime
     undef,         # ctime
     512,           # blksize
     int(($len+511)/512)  # blocks
    );
}

sub FILENO {
    return undef;   # XXX perlfunc says this means the file is closed
}

sub blocking {
    my $self = shift;
    my $old = *$self->{blocking} || 0;
    *$self->{blocking} = shift if @_;
    return $old;
}

my $notmuch = sub { return };

*fileno    = $notmuch;
*error     = $notmuch;
*clearerr  = $notmuch; 
*sync      = $notmuch;
*flush     = $notmuch;
*setbuf    = $notmuch;
*setvbuf   = $notmuch;

*untaint   = $notmuch;
*autoflush = $notmuch;
*fcntl     = $notmuch;
*ioctl     = $notmuch;

*GETC   = \&getc;
*PRINT  = \&print;
*PRINTF = \&printf;
*READ   = \&read;
*WRITE  = \&write;
*SEEK   = \&seek;
*TELL   = \&getpos;
*EOF    = \&eof;
*CLOSE  = \&close;
*BINMODE = \&binmode;


sub string_ref
{
    my $self = shift;
    return *$self->{buf};
}
*sref = \&string_ref;

1;

__END__

=head1 NAME

IO::String - Emulate file interface for in-core strings

=head1 SYNOPSIS

 use IO::String;
 $io = IO::String->new;
 $io = IO::String->new($var);
 tie *IO, 'IO::String';

 # read data
 <$io>;