1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
=head1 NAME
Tk::Event - ToolKit for Events
=for category Implementation
=head1 SYNOPSIS
use Tk::Event;
Tk::Event->fileevent(\*FH, 'readable' => callback);
Tk::Event->lineavail(\*FH, callback);
use Tk::Event::Signal qw(INT);
$SIG{'INT'} = callback;
use Tk::Event::process;
Tk::Event->proc($pid, callback);
QueueEvent(callback [, position])
=head1 DESCRIPTION
That is better than nothing but still hard to use. Most scripts want higher
level result (a line, a "block" of data etc.)
So it has occured to me that we could use new-ish TIEHANDLE thus:
my $obj = tie SOMEHANDLE,Tk::Event::IO;
while (<SOMEHANDLE>)
{
}
Then the READLINE routine registers a callback and looks something like:
sub READLINE
{
my $obj = shift;
Event->io(*$obj,'readable',sub { sysread(*$obj,${*$obj},1,length(${*$obj}) });
my $pos;
while (($pos = index(${*$obj},$/) < 0)
{
DoOneEvent();
}
Event->io(*$obj,'readable',''); # unregister
$pos += length($/);
my $result = substr(${*$obj},0,$pos);
substr(${*$obj},0,$pos) = '';
return $result;
}
This is using the scalar part of the glob representing the _inner_ IO
as a buffer in which to accumulate chars.
=cut
|
