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.\" ========================================================================
.\"
.IX Title "Perl6::Export::Attrs 3pm"
.TH Perl6::Export::Attrs 3pm "2011-04-22" "perl v5.10.1" "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"
Perl6::Export::Attrs \- The Perl 6 'is export(...)' trait as a Perl 5 attribute
.SH "VERSION"
.IX Header "VERSION"
This document describes Perl6::Export::Attrs version 0.0.3
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&        package Some::Module;
\&    use Perl6::Export::Attrs;
\&
\&        # Export &foo by default, when explicitly requested,
\&        # or when the \*(Aq:ALL\*(Aq export set is requested...
\&
\&        sub foo :Export(:DEFAULT) {
\&                print "phooo!";
\&        }
\&
\&
\&        # Export &var by default, when explicitly requested,
\&        # or when the \*(Aq:bees\*(Aq, \*(Aq:pubs\*(Aq, or \*(Aq:ALL\*(Aq export set is requested...
\&        # the parens after \*(Aqis export\*(Aq are like the parens of a qw(...)
\&
\&        sub bar :Export(:DEFAULT :bees :pubs) {
\&                print "baaa!";
\&        }
\&
\&
\&        # Export &baz when explicitly requested
\&        # or when the \*(Aq:bees\*(Aq or \*(Aq:ALL\*(Aq export set is requested...
\&
\&        sub baz :Export(:bees) {
\&                print "baassss!";
\&        }
\&
\&
\&        # Always export &qux 
\&        # (no matter what else is explicitly or implicitly requested)
\&
\&        sub qux :Export(:MANDATORY) {
\&                print "quuuuuuuuux!";
\&        }
\&
\&
\&        IMPORT {
\&                # This block is called when the module is used (as usual),
\&                # but it is called after any export requests have been handled.
\&                # Those requests will have been stripped from its @_ argument list
\&    }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Implements a Perl 5 native version of what the Perl 6 symbol export mechanism
will look like.
.PP
It's very straightforward:
.IP "\(bu" 4
If you want a subroutine to be capable of being exported (when
explicitly requested in the \f(CW\*(C`use\*(C'\fR arguments), you mark it
with the \f(CW\*(C`:Export\*(C'\fR attribute.
.IP "\(bu" 4
If you want a subroutine to be automatically exported when the module is
used (without specific overriding arguments), you mark it with
the \f(CW\*(C`:Export(:DEFAULT)\*(C'\fR attribute.
.IP "\(bu" 4
If you want a subroutine to be automatically exported when the module is
used (even if the user specifies overriding arguments), you mark it with
the \f(CW\*(C`:Export(:MANDATORY)\*(C'\fR attribute.
.IP "\(bu" 4
If the subroutine should also be exported when particular export groups
are requested, you add the names of those export groups to the attribute's
argument list.
.PP
That's it.
.ie n .SS """IMPORT"" blocks"
.el .SS "\f(CWIMPORT\fP blocks"
.IX Subsection "IMPORT blocks"
Perl 6 replaces the \f(CW\*(C`import\*(C'\fR subroutine with an \f(CW\*(C`IMPORT\*(C'\fR block. It's
analogous to a \f(CW\*(C`BEGIN\*(C'\fR or \f(CW\*(C`END\*(C'\fR block, except that it's executed every
time the corresponding module is \f(CW\*(C`use\*(C'\fR'd.
.PP
The \f(CW\*(C`IMPORT\*(C'\fR block is passed the argument list that was specified on
the \f(CW\*(C`use\*(C'\fR line that loaded the corresponding module. However, any
export specifications (names of subroutines or tagsets to be exported)
will have already been removed from that argument list before
\&\f(CW\*(C`IMPORT\*(C'\fR receives it.
.SH "DIAGNOSTICS"
.IX Header "DIAGNOSTICS"
.ie n .IP "%s does not export: %s\enuse %s failed" 4
.el .IP "\f(CW%s\fR does not export: \f(CW%s\fR\enuse \f(CW%s\fR failed" 4
.IX Item "%s does not export: %snuse %s failed"
You tried to import the specified subroutine, but the module didn't
export it. Often caused by a misspelling, or forgetting to add an
\&\f(CW\*(C`:Export\*(C'\fR attribute to the definition of the subroutine in question.
.ie n .IP "Bad tagset in :Export attribute at %s line %s: [%s]" 4
.el .IP "Bad tagset in :Export attribute at \f(CW%s\fR line \f(CW%s:\fR [%s]" 4
.IX Item "Bad tagset in :Export attribute at %s line %s: [%s]"
You tried to import a collection of subroutines via a tagset, but the module
didn't export any subroutines under that tagset. Is the tagset name misspelled
(maybe you forgot the colon?).
.ie n .IP "Internal error: missing symbol for %s" 4
.el .IP "Internal error: missing symbol for \f(CW%s\fR" 4
.IX Item "Internal error: missing symbol for %s"
A subroutine was specified as being exported during module compilation
but mysteriously ceased to exist before the module was imported.
.SH "CONFIGURATION AND ENVIRONMENT"
.IX Header "CONFIGURATION AND ENVIRONMENT"
Perl6::Export::Attrs requires no configuration files or environment variables.
.SH "DEPENDENCIES"
.IX Header "DEPENDENCIES"
This module requires the Attribute::Handlers module to handle the attributes.
.SH "INCOMPATIBILITIES"
.IX Header "INCOMPATIBILITIES"
None reported.
.SH "BUGS AND LIMITATIONS"
.IX Header "BUGS AND LIMITATIONS"
No bugs have been reported.
Note that the module does not support exporting variables.
This is considered a \fIfeature\fR, not a bug. See Chapter 17 of
Perl Best Practices (O'Reilly, 2005).
.PP
Please report any bugs or feature requests to
\&\f(CW\*(C`bug\-perl6\-export\-attrs@rt.cpan.org\*(C'\fR, or through the web interface at
<http://rt.cpan.org>.
.SH "AUTHOR"
.IX Header "AUTHOR"
Damian Conway  \f(CW\*(C`<DCONWAY@cpan.org>\*(C'\fR
.SH "LICENCE AND COPYRIGHT"
.IX Header "LICENCE AND COPYRIGHT"
Copyright (c) 2005, Damian Conway \f(CW\*(C`<DCONWAY@cpan.org>\*(C'\fR. All rights reserved.
.PP
This module is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
.SH "DISCLAIMER OF WARRANTY"
.IX Header "DISCLAIMER OF WARRANTY"
\&\s-1BECAUSE\s0 \s-1THIS\s0 \s-1SOFTWARE\s0 \s-1IS\s0 \s-1LICENSED\s0 \s-1FREE\s0 \s-1OF\s0 \s-1CHARGE\s0, \s-1THERE\s0 \s-1IS\s0 \s-1NO\s0 \s-1WARRANTY\s0
\&\s-1FOR\s0 \s-1THE\s0 \s-1SOFTWARE\s0, \s-1TO\s0 \s-1THE\s0 \s-1EXTENT\s0 \s-1PERMITTED\s0 \s-1BY\s0 \s-1APPLICABLE\s0 \s-1LAW\s0. \s-1EXCEPT\s0 \s-1WHEN\s0
\&\s-1OTHERWISE\s0 \s-1STATED\s0 \s-1IN\s0 \s-1WRITING\s0 \s-1THE\s0 \s-1COPYRIGHT\s0 \s-1HOLDERS\s0 \s-1AND/OR\s0 \s-1OTHER\s0 \s-1PARTIES\s0
\&\s-1PROVIDE\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \*(L"\s-1AS\s0 \s-1IS\s0\*(R" \s-1WITHOUT\s0 \s-1WARRANTY\s0 \s-1OF\s0 \s-1ANY\s0 \s-1KIND\s0, \s-1EITHER\s0
\&\s-1EXPRESSED\s0 \s-1OR\s0 \s-1IMPLIED\s0, \s-1INCLUDING\s0, \s-1BUT\s0 \s-1NOT\s0 \s-1LIMITED\s0 \s-1TO\s0, \s-1THE\s0 \s-1IMPLIED\s0
\&\s-1WARRANTIES\s0 \s-1OF\s0 \s-1MERCHANTABILITY\s0 \s-1AND\s0 \s-1FITNESS\s0 \s-1FOR\s0 A \s-1PARTICULAR\s0 \s-1PURPOSE\s0. \s-1THE\s0
\&\s-1ENTIRE\s0 \s-1RISK\s0 \s-1AS\s0 \s-1TO\s0 \s-1THE\s0 \s-1QUALITY\s0 \s-1AND\s0 \s-1PERFORMANCE\s0 \s-1OF\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \s-1IS\s0 \s-1WITH\s0
\&\s-1YOU\s0. \s-1SHOULD\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \s-1PROVE\s0 \s-1DEFECTIVE\s0, \s-1YOU\s0 \s-1ASSUME\s0 \s-1THE\s0 \s-1COST\s0 \s-1OF\s0 \s-1ALL\s0
\&\s-1NECESSARY\s0 \s-1SERVICING\s0, \s-1REPAIR\s0, \s-1OR\s0 \s-1CORRECTION\s0.
.PP
\&\s-1IN\s0 \s-1NO\s0 \s-1EVENT\s0 \s-1UNLESS\s0 \s-1REQUIRED\s0 \s-1BY\s0 \s-1APPLICABLE\s0 \s-1LAW\s0 \s-1OR\s0 \s-1AGREED\s0 \s-1TO\s0 \s-1IN\s0 \s-1WRITING\s0
\&\s-1WILL\s0 \s-1ANY\s0 \s-1COPYRIGHT\s0 \s-1HOLDER\s0, \s-1OR\s0 \s-1ANY\s0 \s-1OTHER\s0 \s-1PARTY\s0 \s-1WHO\s0 \s-1MAY\s0 \s-1MODIFY\s0 \s-1AND/OR\s0
\&\s-1REDISTRIBUTE\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \s-1AS\s0 \s-1PERMITTED\s0 \s-1BY\s0 \s-1THE\s0 \s-1ABOVE\s0 \s-1LICENCE\s0, \s-1BE\s0
\&\s-1LIABLE\s0 \s-1TO\s0 \s-1YOU\s0 \s-1FOR\s0 \s-1DAMAGES\s0, \s-1INCLUDING\s0 \s-1ANY\s0 \s-1GENERAL\s0, \s-1SPECIAL\s0, \s-1INCIDENTAL\s0,
\&\s-1OR\s0 \s-1CONSEQUENTIAL\s0 \s-1DAMAGES\s0 \s-1ARISING\s0 \s-1OUT\s0 \s-1OF\s0 \s-1THE\s0 \s-1USE\s0 \s-1OR\s0 \s-1INABILITY\s0 \s-1TO\s0 \s-1USE\s0
\&\s-1THE\s0 \s-1SOFTWARE\s0 (\s-1INCLUDING\s0 \s-1BUT\s0 \s-1NOT\s0 \s-1LIMITED\s0 \s-1TO\s0 \s-1LOSS\s0 \s-1OF\s0 \s-1DATA\s0 \s-1OR\s0 \s-1DATA\s0 \s-1BEING\s0
\&\s-1RENDERED\s0 \s-1INACCURATE\s0 \s-1OR\s0 \s-1LOSSES\s0 \s-1SUSTAINED\s0 \s-1BY\s0 \s-1YOU\s0 \s-1OR\s0 \s-1THIRD\s0 \s-1PARTIES\s0 \s-1OR\s0 A
\&\s-1FAILURE\s0 \s-1OF\s0 \s-1THE\s0 \s-1SOFTWARE\s0 \s-1TO\s0 \s-1OPERATE\s0 \s-1WITH\s0 \s-1ANY\s0 \s-1OTHER\s0 \s-1SOFTWARE\s0), \s-1EVEN\s0 \s-1IF\s0
\&\s-1SUCH\s0 \s-1HOLDER\s0 \s-1OR\s0 \s-1OTHER\s0 \s-1PARTY\s0 \s-1HAS\s0 \s-1BEEN\s0 \s-1ADVISED\s0 \s-1OF\s0 \s-1THE\s0 \s-1POSSIBILITY\s0 \s-1OF\s0
\&\s-1SUCH\s0 \s-1DAMAGES\s0.