NAME¶
SGMLS::Output - Stack-based Output Procedures
SYNOPSIS¶
use SGMLS::Output;
To print a string to the current output destination:
output($data);
To push a new output level to the filehandle DATA:
push_output('handle',DATA);
To push a new output level to the file "foo.data" (which will be
opened and closed automatically):
push_output('file','foo.data');
To push a new output level to a pipe to the shell command "sort":
push_output('pipe','sort');
To push a new output level
appending to the file "foo.data":
push_output('append','foo.data');
To push a new output level to an empty string:
push_output('string');
To push a new output level appending to the string "David is ":
push_output('string',"David is ");
To push a new output level to The Great Beyond:
push_output('nul');
To revert to the previous output level:
pop_output();
To revert to the previous output level, returning the contents of an output
string:
$data = pop_output();
DESCRIPTION¶
This library allows redirectable, stack-based output to files, pipes, handles,
strings, or nul. It is especially useful for packages like SGMLS, since
handlers for individual
SGML elements can temporarily change and
restore the default output destination. It is also particularly useful for
capturing the contents of an element (and its sub-elements) in a string.
Example:
sgmls('<title>', sub{ push_output('string'); });
sgmls('</title>', sub{ $title = pop_output(); });
In between, anything sent to
output (such as CDATA) will be accumulated
in the string returned from
pop_output().
Example:
sgmls('<tei.header>', sub { push_output('nul'); });
sgmls('</tei.header>', sub { pop_output(); });
All output will be ignored until the header has finished.
AUTHOR AND COPYRIGHT¶
Copyright 1994 and 1995 by David Megginson,
"dmeggins@aix1.uottawa.ca". Distributed under the terms of the Gnu
General Public License (version 2, 1991) -- see the file "COPYING"
which is included in the
SGMLS.pm distribution.
SEE ALSO:¶
SGMLS.