File Coverage

blib/lib/PerlIO/via/EscStatus/Parser.pm

Criterion	Covered	Total	%
statement	23	23	100.0
branch	4	4	100.0
condition			n/a
subroutine	6	6	100.0
pod	2	2	100.0
total	35	35	100.0

# Copyright 2008, 2009, 2010, 2011, 2012 Kevin Ryde

# This file is part of PerlIO-via-EscStatus.
#
# PerlIO-via-EscStatus is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as published
# by the Free Software Foundation; either version 3, or (at your option) any
# later version.
#
# PerlIO-via-EscStatus is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with PerlIO-via-EscStatus.  If not, see .

package PerlIO::via::EscStatus::Parser;
use 5.006;  # for $-[0]
use strict;
use warnings;

our $VERSION = 11;

# This regexp generated by devel/partial-end.pl.  It matches either a whole
# ESCSTATUS_STR anywhere, or a leading portion of it at the end of the
# string, like say /\e_$/.  Frequently there won't be any Esc's left in the
# string and the first \e will quickly fail to match.
#
use constant ESCSTATUS_STR_PARTIAL_REGEXP =>
  qr/\e(?:$|_(?:$|E(?:$|s(?:$|c(?:$|S(?:$|t(?:$|a(?:$|t(?:$|u(?:$|s(?:$|\e(?:$|\\))))))))))))/;

sub new {
  my ($class) = @_;
  return bless { partial => '' }, $class;
}

sub parse {
  my ($self, $buf) = @_;
  my $status = undef;
  $buf = $self->{'partial'} . $buf;

  # whole statuses
  if ($buf =~ s/\e_EscStatus\e\\([^\n]*)\n//g) {
    $status = $1;
  }
  my $pos = ($buf =~ ESCSTATUS_STR_PARTIAL_REGEXP
             ? $-[0] # start of match
             : length ($buf));
  $self->{'partial'} = substr ($buf, $pos); # match onwards
  $buf = substr ($buf, 0, $pos);            # prematch
  return ($status, $buf);
}

1;
__END__