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package Test::Builder::IO::Scalar;
HideShow 26 lines of Pod
=head1 NAME
Test::Builder::IO::Scalar - A copy of IO::Scalar for Test::Builder
=head1 DESCRIPTION
This is a copy of IO::Scalar which ships with Test::Builder to
support scalar references as filehandles on Perl 5.6.  Newer
versions of Perl simply use C<<open()>>'s built in support.
Test::Builder can not have dependencies on other modules without
careful consideration, so its simply been copied into the distribution.
=head1 COPYRIGHT and LICENSE
This file came from the "IO-stringy" Perl5 toolkit.
Copyright (c) 1996 by Eryq.  All rights reserved.
Copyright (c) 1999,2001 by ZeeGee Software Inc.  All rights reserved.
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
=cut
# This is copied code, I don't care.
##no critic
use Carp;
use strict;
use vars qw($VERSION @ISA);
use IO::Handle;
use 5.005;
### The package version, both in 1.23 style *and* usable by MakeMaker:
$VERSION = "2.110";
### Inheritance:
@ISA = qw(IO::Handle);
#==============================
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=head2 Construction
=over 4
=cut
#------------------------------
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=item new [ARGS...]
I<Class method.>
Return a new, unattached scalar handle.
If any arguments are given, they're sent to open().
=cut
sub new {
    my $proto = shift;
    my $class = ref($proto) || $proto;
    my $self = bless \do { local *FH }, $class;
    tie *$self, $class, $self;
    $self->open(@_);   ### open on anonymous by default
    $self;
}
sub DESTROY {
    shift->close;
}
#------------------------------
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=item open [SCALARREF]
I<Instance method.>
Open the scalar handle on a new scalar, pointed to by SCALARREF.
If no SCALARREF is given, a "private" scalar is created to hold
the file data.
Returns the self object on success, undefined on error.
=cut
sub open {
    my ($self, $sref) = @_;
    ### Sanity:
    defined($sref) or do {my $s = ''; $sref = \$s};
    (ref($sref) eq "SCALAR") or croak "open() needs a ref to a scalar";
    ### Setup:
    *$self->{Pos} = 0;          ### seek position
    *$self->{SR}  = $sref;      ### scalar reference
    $self;
}
#------------------------------
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=item opened
I<Instance method.>
Is the scalar handle opened on something?
=cut
sub opened {
    *{shift()}->{SR};
}
#------------------------------
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=item close
I<Instance method.>
Disassociate the scalar handle from its underlying scalar.
Done automatically on destroy.
=cut
sub close {
    my $self = shift;
    %{*$self} = ();
    1;
}
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=back
=cut
#==============================
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=head2 Input and output
=over 4
=cut
#------------------------------
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=item flush
I<Instance method.>
No-op, provided for OO compatibility.
=cut
sub flush { "0 but true" }
#------------------------------
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=item getc
I<Instance method.>
Return the next character, or undef if none remain.
=cut
sub getc {
    my $self = shift;
    ### Return undef right away if at EOF; else, move pos forward:
    return undef if $self->eof;
    substr(${*$self->{SR}}, *$self->{Pos}++, 1);
}
#------------------------------
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=item getline
I<Instance method.>
Return the next line, or undef on end of string.
Can safely be called in an array context.
Currently, lines are delimited by "\n".
=cut
sub getline {
    my $self = shift;
    ### Return undef right away if at EOF:
    return undef if $self->eof;
    ### Get next line:
    my $sr = *$self->{SR};
    my $i  = *$self->{Pos};          ### Start matching at this point.
    ### Minimal impact implementation!
    ### We do the fast fast thing (no regexps) if using the
    ### classic input record separator.
    ### Case 1: $/ is undef: slurp all...
    if    (!defined($/)) {
        *$self->{Pos} = length $$sr;
        return substr($$sr, $i);
    }
    ### Case 2: $/ is "\n": zoom zoom zoom...
    elsif ($/ eq "\012") {
        ### Seek ahead for "\n"... yes, this really is faster than regexps.
        my $len = length($$sr);
        for (; $i < $len; ++$i) {
           last if ord (substr ($$sr, $i, 1)) == 10;
        }
        ### Extract the line:
        my $line;
        if ($i < $len) {                ### We found a "\n":
            $line = substr ($$sr, *$self->{Pos}, $i - *$self->{Pos} + 1);
            *$self->{Pos} = $i+1;            ### Remember where we finished up.
        }
        else {                          ### No "\n"; slurp the remainder:
            $line = substr ($$sr, *$self->{Pos}, $i - *$self->{Pos});
            *$self->{Pos} = $len;
        }
        return $line;
    }
    ### Case 3: $/ is ref to int. Do fixed-size records.
    ###        (Thanks to Dominique Quatravaux.)
    elsif (ref($/)) {
        my $len = length($$sr);
                my $i = ${$/} + 0;
                my $line = substr ($$sr, *$self->{Pos}, $i);
                *$self->{Pos} += $i;
        *$self->{Pos} = $len if (*$self->{Pos} > $len);
                return $line;
    }
    ### Case 4: $/ is either "" (paragraphs) or something weird...
    ###         This is Graham's general-purpose stuff, which might be
    ###         a tad slower than Case 2 for typical data, because
    ###         of the regexps.
    else {
        pos($$sr) = $i;
        ### If in paragraph mode, skip leading lines (and update i!):
        length($/) or
            (($$sr =~ m/\G\n*/g) and ($i = pos($$sr)));
        ### If we see the separator in the buffer ahead...
        if (length($/)
            ?  $$sr =~ m,\Q$/\E,g          ###   (ordinary sep) TBD: precomp!
            :  $$sr =~ m,\n\n,g            ###   (a paragraph)
            ) {
            *$self->{Pos} = pos $$sr;
            return substr($$sr, $i, *$self->{Pos}-$i);
        }
        ### Else if no separator remains, just slurp the rest:
        else {
            *$self->{Pos} = length $$sr;
            return substr($$sr, $i);
        }
    }
}
#------------------------------
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=item getlines
I<Instance method.>
Get all remaining lines.
It will croak() if accidentally called in a scalar context.
=cut
sub getlines {
    my $self = shift;
    wantarray or croak("can't call getlines in scalar context!");
    my ($line, @lines);
    push @lines, $line while (defined($line = $self->getline));
    @lines;
}
#------------------------------
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=item print ARGS...
I<Instance method.>
Print ARGS to the underlying scalar.
B<Warning:> this continues to always cause a seek to the end
of the string, but if you perform seek()s and tell()s, it is
still safer to explicitly seek-to-end before subsequent print()s.
=cut
sub print {
    my $self = shift;
    *$self->{Pos} = length(${*$self->{SR}} .= join('', @_) . (defined($\) ? $\ : ""));
    1;
}
sub _unsafe_print {
    my $self = shift;
    my $append = join('', @_) . $\;
    ${*$self->{SR}} .= $append;
    *$self->{Pos}   += length($append);
    1;
}
sub _old_print {
    my $self = shift;
    ${*$self->{SR}} .= join('', @_) . $\;
    *$self->{Pos} = length(${*$self->{SR}});
    1;
}
#------------------------------
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=item read BUF, NBYTES, [OFFSET]
I<Instance method.>
Read some bytes from the scalar.
Returns the number of bytes actually read, 0 on end-of-file, undef on error.
=cut
sub read {
    my $self = $_[0];
    my $n    = $_[2];
    my $off  = $_[3] || 0;
    my $read = substr(${*$self->{SR}}, *$self->{Pos}, $n);
    $n = length($read);
    *$self->{Pos} += $n;
    ($off ? substr($_[1], $off) : $_[1]) = $read;
    return $n;
}
#------------------------------
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=item write BUF, NBYTES, [OFFSET]
I<Instance method.>
Write some bytes to the scalar.
=cut
sub write {
    my $self = $_[0];
    my $n    = $_[2];
    my $off  = $_[3] || 0;
    my $data = substr($_[1], $off, $n);
    $n = length($data);
    $self->print($data);
    return $n;
}
#------------------------------
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=item sysread BUF, LEN, [OFFSET]
I<Instance method.>
Read some bytes from the scalar.
Returns the number of bytes actually read, 0 on end-of-file, undef on error.
=cut
sub sysread {
  my $self = shift;
  $self->read(@_);
}
#------------------------------
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=item syswrite BUF, NBYTES, [OFFSET]
I<Instance method.>
Write some bytes to the scalar.
=cut
sub syswrite {
  my $self = shift;
  $self->write(@_);
}
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=back
=cut
#==============================
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=head2 Seeking/telling and other attributes
=over 4
=cut
#------------------------------
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=item autoflush
I<Instance method.>
No-op, provided for OO compatibility.
=cut
sub autoflush {}
#------------------------------
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=item binmode
I<Instance method.>
No-op, provided for OO compatibility.
=cut
sub binmode {}
#------------------------------
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=item clearerr
I<Instance method.>  Clear the error and EOF flags.  A no-op.
=cut
sub clearerr { 1 }
#------------------------------
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=item eof
I<Instance method.>  Are we at end of file?
=cut
sub eof {
    my $self = shift;
    (*$self->{Pos} >= length(${*$self->{SR}}));
}
#------------------------------
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=item seek OFFSET, WHENCE
I<Instance method.>  Seek to a given position in the stream.
=cut
sub seek {
    my ($self, $pos, $whence) = @_;
    my $eofpos = length(${*$self->{SR}});
    ### Seek:
    if    ($whence == 0) { *$self->{Pos} = $pos }             ### SEEK_SET
    elsif ($whence == 1) { *$self->{Pos} += $pos }            ### SEEK_CUR
    elsif ($whence == 2) { *$self->{Pos} = $eofpos + $pos}    ### SEEK_END
    else                 { croak "bad seek whence ($whence)" }
    ### Fixup:
    if (*$self->{Pos} < 0)       { *$self->{Pos} = 0 }
    if (*$self->{Pos} > $eofpos) { *$self->{Pos} = $eofpos }
    return 1;
}
#------------------------------
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=item sysseek OFFSET, WHENCE
I<Instance method.> Identical to C<seek OFFSET, WHENCE>, I<q.v.>
=cut
sub sysseek {
    my $self = shift;
    $self->seek (@_);
}
#------------------------------
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=item tell
I<Instance method.>
Return the current position in the stream, as a numeric offset.
=cut
sub tell { *{shift()}->{Pos} }
#------------------------------
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=item  use_RS [YESNO]
I<Instance method.>
B<Deprecated and ignored.>
Obey the current setting of $/, like IO::Handle does?
Default is false in 1.x, but cold-welded true in 2.x and later.
=cut
sub use_RS {
    my ($self, $yesno) = @_;
    carp "use_RS is deprecated and ignored; \$/ is always consulted\n";
 }
#------------------------------
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=item setpos POS
I<Instance method.>
Set the current position, using the opaque value returned by C<getpos()>.
=cut
sub setpos { shift->seek($_[0],0) }
#------------------------------
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=item getpos
I<Instance method.>
Return the current position in the string, as an opaque object.
=cut
*getpos = \&tell;
#------------------------------
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=item sref
I<Instance method.>
Return a reference to the underlying scalar.
=cut
sub sref { *{shift()}->{SR} }
#------------------------------
# Tied handle methods...
#------------------------------
# Conventional tiehandle interface:
sub TIEHANDLE {
    ((defined($_[1]) && UNIVERSAL::isa($_[1], __PACKAGE__))
     ? $_[1]
     : shift->new(@_));
}
sub GETC      { shift->getc(@_) }
sub PRINT     { shift->print(@_) }
sub PRINTF    { shift->print(sprintf(shift, @_)) }
sub READ      { shift->read(@_) }
sub READLINE  { wantarray ? shift->getlines(@_) : shift->getline(@_) }
sub WRITE     { shift->write(@_); }
sub CLOSE     { shift->close(@_); }
sub SEEK      { shift->seek(@_); }
sub TELL      { shift->tell(@_); }
sub EOF       { shift->eof(@_); }
#------------------------------------------------------------
1;
__END__
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=back
=cut
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=head1 WARNINGS
Perl's TIEHANDLE spec was incomplete prior to 5.005_57;
it was missing support for C<seek()>, C<tell()>, and C<eof()>.
Attempting to use these functions with an IO::Scalar will not work
prior to 5.005_57. IO::Scalar will not have the relevant methods
invoked; and even worse, this kind of bug can lie dormant for a while.
If you turn warnings on (via C<$^W> or C<perl -w>),
and you see something like this...
    attempt to seek on unopened filehandle
...then you are probably trying to use one of these functions
on an IO::Scalar with an old Perl.  The remedy is to simply
use the OO version; e.g.:
    $SH->seek(0,0);    ### GOOD: will work on any 5.005
    seek($SH,0,0);     ### WARNING: will only work on 5.005_57 and beyond
=head1 VERSION
$Id: Scalar.pm,v 1.6 2005/02/10 21:21:53 dfs Exp $
=head1 AUTHORS
=head2 Primary Maintainer
David F. Skoll (F<dfs@roaringpenguin.com>).
=head2 Principal author
Eryq (F<eryq@zeegee.com>).
President, ZeeGee Software Inc (F<http://www.zeegee.com>).
=head2 Other contributors
The full set of contributors always includes the folks mentioned
in L<IO::Stringy/"CHANGE LOG">.  But just the same, special
thanks to the following individuals for their invaluable contributions
(if I've forgotten or misspelled your name, please email me!):
I<Andy Glew,>
for contributing C<getc()>.
I<Brandon Browning,>
for suggesting C<opened()>.
I<David Richter,>
for finding and fixing the bug in C<PRINTF()>.
I<Eric L. Brine,>
for his offset-using read() and write() implementations.
I<Richard Jones,>
for his patches to massively improve the performance of C<getline()>
and add C<sysread> and C<syswrite>.
I<B. K. Oxley (binkley),>
for stringification and inheritance improvements,
and sundry good ideas.
I<Doug Wilson,>
for the IO::Handle inheritance and automatic tie-ing.
=head1 SEE ALSO
L<IO::String>, which is quite similar but which was designed
more-recently and with an IO::Handle-like interface in mind,
so you could mix OO- and native-filehandle usage without using tied().
I<Note:> as of version 2.x, these classes all work like
their IO::Handle counterparts, so we have comparable
functionality to IO::String.
=cut