- WRITING A SUBCLASS
- SEE ALSO
- COPYRIGHT AND LICENSE
DateTime::Format::Builder::Parser::generic - Useful routines
Standard constructor. Returns a blessed hash; any arguments are placed in the hash. This is useful for storing information between methods.
This is a method provided solely for the benefit of
Parser implementations. It semi-neatly abstracts a lot of the work involved.
Basically, it takes parameters matching the assorted callbacks from the parser declarations and makes a coderef out of it all.
Currently recognized callbacks are:
Methods for subclassing
These are methods you should define when writing your own subclass.
Note: these methods do not exist in this class. There is no point trying to call
$self->SUPER::do_match( ... ).
do_match is the first phase. Arguments are the date and @args.
args. Return value must be defined if you match successfully.
post_match is called after the appropriate callback out of
on_fail is done. It's passed the date, the return value from
do_match and the parsing hash.
Its return value is used as the
post argument to the
postprocess callback, and as the second argument to
make takes the original input, the return value from
post_match and the parsing hash and should return a
DateTime object or undefined.
For use of
Parser, this module also delegates
params. This is just convenience to save typing the following:
DateTime::Format::Builder::Parser->valid_params( blah )
Instead we get to type:
$self->valid_params( blah ); __PACKAGE__->valid_params( blah );
WRITING A SUBCLASS
Rather than attempt to explain how it all works, I think it's best if you take a look at Regex.pm and Strptime.pm as examples and work from there.
See DateTime::Format::Builder for details.
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Dave Rolsky <email@example.com>
COPYRIGHT AND LICENSE
This software is Copyright (c) 2013 by Dave Rolsky.
This is free software, licensed under:
The Artistic License 2.0 (GPL Compatible)