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.\" ========================================================================
.\"
.IX Title "DateTime::Format::Builder::Parser::generic 3"
.TH DateTime::Format::Builder::Parser::generic 3 "2020-08-09" "perl v5.26.3" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
DateTime::Format::Builder::Parser::generic \- Useful routines
.SH "VERSION"
.IX Header "VERSION"
version 0.83
.SH "METHODS"
.IX Header "METHODS"
.SS "Useful"
.IX Subsection "Useful"
\fInew\fR
.IX Subsection "new"
.PP
Standard constructor. Returns a blessed hash; any arguments are placed in the
hash. This is useful for storing information between methods.
.PP
\fIgeneric_parser\fR
.IX Subsection "generic_parser"
.PP
This is a method provided solely for the benefit of \f(CW\*(C`Parser\*(C'\fR
implementations. It semi-neatly abstracts a lot of the work involved.
.PP
Basically, it takes parameters matching the assorted callbacks from the parser
declarations and makes a coderef out of it all.
.PP
Currently recognized callbacks are:
.IP "\(bu" 4
on_match
.IP "\(bu" 4
on_fail
.IP "\(bu" 4
preprocess
.IP "\(bu" 4
postprocess
.SS "Methods for subclassing"
.IX Subsection "Methods for subclassing"
These are methods you should define when writing your own subclass.
.PP
\&\fBNote\fR: these methods do not exist in this class. There is no point trying to
call \f(CW\*(C`$self\->SUPER::do_match( ... )\*(C'\fR.
.PP
\fIdo_match\fR
.IX Subsection "do_match"
.PP
\&\f(CW\*(C`do_match\*(C'\fR is the first phase. Arguments are the date and \f(CW@args\fR. \f(CW\*(C`self\*(C'\fR,
\&\f(CW\*(C`label\*(C'\fR, \f(CW\*(C`args\*(C'\fR. Return value must be defined if you match successfully.
.PP
\fIpost_match\fR
.IX Subsection "post_match"
.PP
\&\f(CW\*(C`post_match\*(C'\fR is called after the appropriate callback out of
\&\f(CW\*(C`on_match\*(C'\fR/\f(CW\*(C`on_fail\*(C'\fR is done. It's passed the date, the return value from
\&\f(CW\*(C`do_match\*(C'\fR and the parsing hash.
.PP
Its return value is used as the \f(CW\*(C`post\*(C'\fR argument to the \f(CW\*(C`postprocess\*(C'\fR
callback, and as the second argument to \f(CW\*(C`make\*(C'\fR.
.PP
\fImake\fR
.IX Subsection "make"
.PP
\&\f(CW\*(C`make\*(C'\fR takes the original input, the return value from \f(CW\*(C`post_match\*(C'\fR and the
parsing hash and should return a \f(CW\*(C`DateTime\*(C'\fR object or undefined.
.SS "Delegations"
.IX Subsection "Delegations"
For use of \f(CW\*(C`Parser\*(C'\fR, this module also delegates \f(CW\*(C`valid_params\*(C'\fR and
\&\f(CW\*(C`params\*(C'\fR. This is just convenience to save typing the following:
.PP
.Vb 1
\&    DateTime::Format::Builder::Parser\->valid_params(...)
.Ve
.PP
Instead we get to type:
.PP
.Vb 2
\&    $self\->valid_params(...);
\&    _\|_PACKAGE_\|_\->valid_params(...);
.Ve
.SH "WRITING A SUBCLASS"
.IX Header "WRITING A SUBCLASS"
Rather than attempt to explain how it all works, I think it's best if you take
a look at \fIRegex.pm\fR and \fIStrptime.pm\fR as examples and work from there.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\f(CW\*(C`datetime@perl.org\*(C'\fR mailing list.
.PP
http://datetime.perl.org/
.PP
perl, DateTime, DateTime::Format::Builder,
DateTime::Format::Builder::Parser.
.SH "SUPPORT"
.IX Header "SUPPORT"
Bugs may be submitted at <https://github.com/houseabsolute/DateTime\-Format\-Builder/issues>.
.PP
I am also usually active on \s-1IRC\s0 as 'autarch' on \f(CW\*(C`irc://irc.perl.org\*(C'\fR.
.SH "SOURCE"
.IX Header "SOURCE"
The source code repository for DateTime-Format-Builder can be found at <https://github.com/houseabsolute/DateTime\-Format\-Builder>.
.SH "AUTHORS"
.IX Header "AUTHORS"
.IP "\(bu" 4
Dave Rolsky <autarch@urth.org>
.IP "\(bu" 4
Iain Truskett <spoon@cpan.org>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is Copyright (c) 2020 by Dave Rolsky.
.PP
This is free software, licensed under:
.PP
.Vb 1
\&  The Artistic License 2.0 (GPL Compatible)
.Ve
.PP
The full text of the license can be found in the
\&\fI\s-1LICENSE\s0\fR file included with this distribution.