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package Language::TECO::Buffer;
use Moose;
use namespace::autoclean;
has _buffer => (
traits => ['String'],
is => 'rw',
isa => 'Str',
default => '',
init_arg => 'buffer',
handles => {
_substr_buffer => 'substr',
endpos => 'length',
},
);
has curpos => (
traits => ['Counter'],
is => 'rw',
isa => 'Int',
default => 0,
trigger => sub {
my $self = shift;
my ($curpos, $oldpos) = @_;
# XXX: ick, do this better
if ($curpos < 0 || $curpos > $self->endpos) {
$self->curpos($oldpos);
die "Pointer off page\n";
}
},
handles => {
set => 'set',
offset => 'inc',
},
);
around BUILDARGS => sub {
my $orig = shift;
my $class = shift;
shift if !defined($_[0]);
unshift @_, 'buffer' if @_ % 2 == 1;
return $class->$orig(@_);
};
around qw(set offset) => sub {
my $orig = shift;
my $self = shift;
$self->$orig(@_);
return;
};
sub buffer {
my $self = shift;
my ($start, $end) = @_;
$start = 0 if !defined $start || $start < 0;
$end = $self->endpos if !defined $end || $end > $self->endpos;
($start, $end) = ($end, $start) if $start > $end;
return $self->_substr_buffer($start, $end - $start);
}
sub insert {
my $self = shift;
my ($text) = @_;
$self->_substr_buffer($self->curpos, 0, $text);
$self->offset(length $text);
return;
}
sub delete {
my $self = shift;
my ($start, $end) = @_;
($start, $end) = ($end, $start) if $start > $end;
die "Pointer off page\n" if $start < 0 || $end > $self->endpos;
$self->_substr_buffer($start, $end - $start, '');
$self->set($start);
return;
}
sub get_line_offset {
my $self = shift;
my $num = shift;
# XXX: what in the world was i thinking... clean this up
if ($num > 0) {
my $buffer = $self->buffer;
pos $buffer = $self->curpos;
$buffer =~ /(?:.*(?:\n|$)){0,$num}/g;
return ($-[0], $+[0]) if wantarray;
return $+[0];
}
else {
$num = -$num;
my $rev = reverse $self->buffer;
my $len = $self->endpos;
pos $rev = $len - $self->curpos;
$rev =~ /.*?(?:\n.*?){0,$num}(?=\n|$)/g;
return ($len - $+[0], $len - $-[0]) if wantarray;
return $len - $+[0];
}
}
__PACKAGE__->meta->make_immutable;
1;
|
