From 9a9d89e7a7ad4a2b6f2ff51c617ab852e2ae5bcc Mon Sep 17 00:00:00 2001 From: denghao Date: Thu, 1 Sep 2022 10:35:57 +0300 Subject: [PATCH] Import Upstream version 0.2800 --- CONTRIBUTING.mkdn | 87 +++++ Changes | 185 +++++++++++ LICENSE | 379 ++++++++++++++++++++++ MANIFEST | 37 +++ META.json | 112 +++++++ META.yml | 54 ++++ Makefile.PL | 61 ++++ README | 170 ++++++++++ cpanfile | 46 +++ dist.ini | 15 + examples/uplevel-demo.pl | 23 ++ lib/Sub/Uplevel.pm | 610 +++++++++++++++++++++++++++++++++++ perlcritic.rc | 26 ++ t/00-report-prereqs.dd | 56 ++++ t/00-report-prereqs.t | 183 +++++++++++ t/01_die_check.t | 18 ++ t/02_uplevel.t | 211 ++++++++++++ t/03_nested_uplevels.t | 81 +++++ t/04_honor_later_override.t | 83 +++++ t/05_honor_prior_override.t | 94 ++++++ t/06_db_args.t | 34 ++ t/07_uplevel_too_high.t | 33 ++ t/08_exporter.t | 19 ++ t/09_emptylist.t | 34 ++ t/lib/Bar.pm | 8 + t/lib/Foo.pm | 8 + t/lib/MyImporter.pm | 15 + xt/author/00-compile.t | 63 ++++ xt/author/critic.t | 12 + xt/author/pod-coverage.t | 7 + xt/author/pod-spell.t | 41 +++ xt/author/pod-syntax.t | 7 + xt/author/portability.t | 10 + xt/author/test-version.t | 23 ++ xt/release/distmeta.t | 6 + xt/release/minimum-version.t | 8 + 36 files changed, 2859 insertions(+) create mode 100644 CONTRIBUTING.mkdn create mode 100644 Changes create mode 100644 LICENSE create mode 100644 MANIFEST create mode 100644 META.json create mode 100644 META.yml create mode 100644 Makefile.PL create mode 100644 README create mode 100644 cpanfile create mode 100644 dist.ini create mode 100644 examples/uplevel-demo.pl create mode 100644 lib/Sub/Uplevel.pm create mode 100644 perlcritic.rc create mode 100644 t/00-report-prereqs.dd create mode 100644 t/00-report-prereqs.t create mode 100644 t/01_die_check.t create mode 100644 t/02_uplevel.t create mode 100644 t/03_nested_uplevels.t create mode 100644 t/04_honor_later_override.t create mode 100644 t/05_honor_prior_override.t create mode 100644 t/06_db_args.t create mode 100644 t/07_uplevel_too_high.t create mode 100644 t/08_exporter.t create mode 100644 t/09_emptylist.t create mode 100644 t/lib/Bar.pm create mode 100644 t/lib/Foo.pm create mode 100644 t/lib/MyImporter.pm create mode 100644 xt/author/00-compile.t create mode 100644 xt/author/critic.t create mode 100644 xt/author/pod-coverage.t create mode 100644 xt/author/pod-spell.t create mode 100644 xt/author/pod-syntax.t create mode 100644 xt/author/portability.t create mode 100644 xt/author/test-version.t create mode 100644 xt/release/distmeta.t create mode 100644 xt/release/minimum-version.t diff --git a/CONTRIBUTING.mkdn b/CONTRIBUTING.mkdn new file mode 100644 index 0000000..761c9db --- /dev/null +++ b/CONTRIBUTING.mkdn @@ -0,0 +1,87 @@ +## HOW TO CONTRIBUTE + +Thank you for considering contributing to this distribution. This file +contains instructions that will help you work with the source code. + +The distribution is managed with Dist::Zilla. This means than many of the +usual files you might expect are not in the repository, but are generated at +release time, as is much of the documentation. Some generated files are +kept in the repository as a convenience (e.g. Makefile.PL or cpanfile). + +Generally, **you do not need Dist::Zilla to contribute patches**. You do need +Dist::Zilla to create a tarball. See below for guidance. + +### Getting dependencies + +If you have App::cpanminus 1.6 or later installed, you can use `cpanm` to +satisfy dependencies like this: + + $ cpanm --installdeps . + +Otherwise, look for either a `Makefile.PL` or `cpanfile` file for +a list of dependencies to satisfy. + +### Running tests + +You can run tests directly using the `prove` tool: + + $ prove -l + $ prove -lv t/some_test_file.t + +For most of my distributions, `prove` is entirely sufficient for you to test any +patches you have. I use `prove` for 99% of my testing during development. + +### Code style and tidying + +Please try to match any existing coding style. If there is a `.perltidyrc` +file, please install Perl::Tidy and use perltidy before submitting patches. + +If there is a `tidyall.ini` file, you can also install Code::TidyAll and run +`tidyall` on a file or `tidyall -a` to tidy all files. + +### Patching documentation + +Much of the documentation Pod is generated at release time. Some is +generated boilerplate; other documentation is built from pseudo-POD +directives in the source like C<=method> or C<=func>. + +If you would like to submit a documentation edit, please limit yourself to +the documentation you see. + +If you see typos or documentation issues in the generated docs, please +email or open a bug ticket instead of patching. + +### Installing and using Dist::Zilla + +Dist::Zilla is a very powerful authoring tool, optimized for maintaining a +large number of distributions with a high degree of automation, but it has a +large dependency chain, a bit of a learning curve and requires a number of +author-specific plugins. + +To install it from CPAN, I recommend one of the following approaches for +the quickest installation: + + # using CPAN.pm, but bypassing non-functional pod tests + $ cpan TAP::Harness::Restricted + $ PERL_MM_USE_DEFAULT=1 HARNESS_CLASS=TAP::Harness::Restricted cpan Dist::Zilla + + # using cpanm, bypassing *all* tests + $ cpanm -n Dist::Zilla + +In either case, it's probably going to take about 10 minutes. Go for a walk, +go get a cup of your favorite beverage, take a bathroom break, or whatever. +When you get back, Dist::Zilla should be ready for you. + +Then you need to install any plugins specific to this distribution: + + $ cpan `dzil authordeps` + $ dzil authordeps | cpanm + +Once installed, here are some dzil commands you might try: + + $ dzil build + $ dzil test + $ dzil xtest + +You can learn more about Dist::Zilla at http://dzil.org/ + diff --git a/Changes b/Changes new file mode 100644 index 0000000..4ec3c55 --- /dev/null +++ b/Changes @@ -0,0 +1,185 @@ +Changes for Sub::Uplevel + +0.2800 2017-04-01 13:31:22-04:00 America/New_York + + - No changes from 0.2700-TRIAL + +0.2700 2017-03-30 10:09:46-04:00 America/New_York (TRIAL RELEASE) + + [Fixed] + + - Tests now work if '.' is not in @INC + +0.2600 2016-08-05 10:46:37-04:00 America/New_York + + - No changes from 0.2501-TRIAL + +0.2501 2016-07-29 16:18:45-04:00 America/New_York (TRIAL RELEASE) + + [~Internal~] + + - Optimized calls to caller() + +0.25 2015-01-26 20:32:52-05:00 America/New_York + + [Fixed] + + - fixed: 00-compile.t failures under Windows (bug #98230). + The 00-compile.t file has been moved to a release test and is + no longer shipped. [Michael Gray] + + [Meta] + + - moved bug tracker to Github + + - updated repo files explaining how to contribute + + - enabled Travis CI + +0.24 2012-02-20 22:18:46 EST5EDT + + - no changes from 0.23_03 + +0.23_03 2012-02-07 17:16:49 EST5EDT + + - fixed: additional test regex fixed + +0.23_02 2012-02-07 14:32:53 EST5EDT + + - fixed: Perl 5.15 series Carp changes output format of messages (adds + a period). This fixes the test regular expressions. [Andreas Koenig] + +0.23_01 2012-02-02 10:41:31 EST5EDT + + - added: the $Sub::Uplevel::CHECK_FRAMES global constant to enable the + frame depth checking and compile it out if not needed. [Adam + Kennedy] + +0.22 Tue Nov 17 05:38:42 EST 2009 + + - meta: added repository to metadata [Alexandr Ciornii] + +0.21_01 Sat Nov 29 15:24:49 EST 2008 + + - added: the ":aggressive" tag may be used to force reloading of + Exporter, which often binds caller() prior to Sub::Uplevel's global + override + +0.2002 Thu Sep 11 14:33:09 EDT 2008 + + - changed: removed Exporter dependency + + - test fix: fixed strange t/07_uplevel_too_high.t fail on Win32 + +0.2001 Tue Sep 9 22:22:40 EDT 2008 + + - test fix: changed prior override test to be more robust (SCHWERN) + +0.20 Tue Sep 9 19:23:35 EDT 2008 + + - changed: bumped perl requirement to 5.006 and stopped using vars + (fixes a test bug under Test::More > 0.80) + +0.19_03 Fri Jul 4 13:31:21 EDT 2008 + + - fixed: load Carp only as needed (fixes problem on 5.005) + +0.19_02 Thu Feb 21 14:58:46 EST 2008 + + - added: uplevel will warn if uplevel request is more than the call + stack depth + +0.1901 Thu Feb 14 14:07:37 EST 2008 + + - fixed: hides the "DB" package from indexers (DB used to support + @DB::args) + +0.19 Thu Feb 14 11:50:16 EST 2008 + + - bug fix: replacement caller() correctly sets @DB::args if calling + package is DB + + - repackaging: custom Build.PL, moved all author tests to xt/, added + LICENSE and INSTALL files + +0.18 Wed Oct 31 06:56:13 EDT 2007 + - release version of 0.17_01 changes + +0.17_01 + - removed 5.006-specific language and tested on prerelease 5.00505 + +0.16 Mon Jul 30 09:54:41 EDT 2007 + - release version of 0.15_01 changes + +0.15_01 Thu Jul 5 22:54:08 EDT 2007 + - Won't override any existing CORE::GLOBAL::caller when loaded + - Localize global caller() override to the scope of the uplevel() call + so it can play nicer with things like Contextual::Return and + Hook::LexWrap that also override caller() + +0.14 Sun Nov 5 23:38:46 EST 2006 + - fixed t/99_pod_coverage.t bug + - added examples directory + +0.13 Thu Jun 22 19:47:26 EDT 2006 + - fixed bug in Uplevel.t that caused test failure on FreeBSD for 5.8.0 + - fixed bug in Uplevel.t that caused test failure on bleadperl-5.9.4 + - removed ancient Test::More provided in t/lib + - switched ok(eq_array()) tests to is_deeper() for better diagnostics + - added pod/pod coverage checks + - numbered tests + +0.12 Fri May 12 18:33:40 EDT 2006 + - official release of the uplevel stack patch (fixes RT#13893) + - added Build.PL and switched to boilerplate generated Makefile.PL + - removed SIGNATURE due to recently discovered Module::Signature + issues with newline handling and sub-key compatible keyservers + - updated/added various meta files + +0.11_01 Fri Apr 21 00:49:51 EDT 2006 + - uplevel now keeps a proper stack of uplevel calls allowing + nesting of uplevel and non-uplevel calls + +0.10 Thu Apr 20 19:15:20 EDT 2006 + - Stopped warnings about "undefined" on Perl 5.8.8 + - DAGOLDEN added as co-maintainer + +0.09 Wed Jul 7 14:52:08 EDT 2004 + - Ok, ok. I'll put a license on this. + +0.08 Wed Oct 22 09:02:38 PDT 2003 + - New die_check.t test was written in a non-portable manner. + [Thanks Martin Thurn and cpantesters] + +0.07 Tue Mar 18 03:03:22 GMT 2003 + - Fixed a test bug due to 5.6.0's differing Carp::croak stack output + +0.06 Thu Sep 20 08:50:30 EDT 2001 + * Fixed a bug with deeply nested callers. + * Fixed nested uplevel() calls. + - Forgot to include Test::More dependency + - Added 5.006 dependency to Makefile.PL + - Removed unnecessary die and warn overrides + - Added DIRE WARNING to the docs. + +0.05 Wed Sep 19 06:00:12 EDT 2001 + * Things were still pretty broken. I *think* I have the tests + sorted out now. + * Blows over any CORE::GLOBAL::caller, die or warn you might have + set. I'll fix this soon. + +0.04 Wed Sep 19 04:28:19 EDT 2001 + * Ooops, we'd broken caller(). Turns out the tests were wrong. + +0.03 Wed Sep 19 03:41:59 EDT 2001 + * Greatly simplified the uplevel logic + +0.02 Wed Sep 19 03:03:10 EDT 2001 + * Fools croak() + +0.01 Wed Sep 19 00:19:38 EDT 2001 + * First working version + * Fools caller(), die() and warn(). + - Needs more work against, say, Carp. + - Needs more work to check that it doesn't break the + subtleties of caller, die and warn. diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..bcaa4d0 --- /dev/null +++ b/LICENSE @@ -0,0 +1,379 @@ +This software is copyright (c) 2017 by Michael Schwern and David Golden. + +This is free software; you can redistribute it and/or modify it under +the same terms as the Perl 5 programming language system itself. + +Terms of the Perl programming language system itself + +a) the GNU General Public License as published by the Free + Software Foundation; either version 1, or (at your option) any + later version, or +b) the "Artistic License" + +--- The GNU General Public License, Version 1, February 1989 --- + +This software is Copyright (c) 2017 by Michael Schwern and David Golden. + +This is free software, licensed under: + + The GNU General Public License, Version 1, February 1989 + + GNU GENERAL PUBLIC LICENSE + Version 1, February 1989 + + Copyright (C) 1989 Free Software Foundation, Inc. + 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The license agreements of most software companies try to keep users +at the mercy of those companies. By contrast, our General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. The +General Public License applies to the Free Software Foundation's +software and to any other program whose authors commit to using it. +You can use it for your programs, too. + + When we speak of free software, we are referring to freedom, not +price. Specifically, the General Public License is designed to make +sure that you have the freedom to give away or sell copies of free +software, that you receive source code or can get it if you want it, +that you can change the software or use pieces of it in new free +programs; and that you know you can do these things. + + To protect your rights, we need to make restrictions that forbid +anyone to deny you these rights or to ask you to surrender the rights. +These restrictions translate to certain responsibilities for you if you +distribute copies of the software, or if you modify it. + + For example, if you distribute copies of a such a program, whether +gratis or for a fee, you must give the recipients all the rights that +you have. You must make sure that they, too, receive or can get the +source code. And you must tell them their rights. + + We protect your rights with two steps: (1) copyright the software, and +(2) offer you this license which gives you legal permission to copy, +distribute and/or modify the software. + + Also, for each author's protection and ours, we want to make certain +that everyone understands that there is no warranty for this free +software. If the software is modified by someone else and passed on, we +want its recipients to know that what they have is not the original, so +that any problems introduced by others will not reflect on the original +authors' reputations. + + The precise terms and conditions for copying, distribution and +modification follow. + + GNU GENERAL PUBLIC LICENSE + TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION + + 0. This License Agreement applies to any program or other work which +contains a notice placed by the copyright holder saying it may be +distributed under the terms of this General Public License. The +"Program", below, refers to any such program or work, and a "work based +on the Program" means either the Program or any work containing the +Program or a portion of it, either verbatim or with modifications. Each +licensee is addressed as "you". + + 1. You may copy and distribute verbatim copies of the Program's source +code as you receive it, in any medium, provided that you conspicuously and +appropriately publish on each copy an appropriate copyright notice and +disclaimer of warranty; keep intact all the notices that refer to this +General Public License and to the absence of any warranty; and give any +other recipients of the Program a copy of this General Public License +along with the Program. You may charge a fee for the physical act of +transferring a copy. + + 2. You may modify your copy or copies of the Program or any portion of +it, and copy and distribute such modifications under the terms of Paragraph +1 above, provided that you also do the following: + + a) cause the modified files to carry prominent notices stating that + you changed the files and the date of any change; and + + b) cause the whole of any work that you distribute or publish, that + in whole or in part contains the Program or any part thereof, either + with or without modifications, to be licensed at no charge to all + third parties under the terms of this General Public License (except + that you may choose to grant warranty protection to some or all + third parties, at your option). + + c) If the modified program normally reads commands interactively when + run, you must cause it, when started running for such interactive use + in the simplest and most usual way, to print or display an + announcement including an appropriate copyright notice and a notice + that there is no warranty (or else, saying that you provide a + warranty) and that users may redistribute the program under these + conditions, and telling the user how to view a copy of this General + Public License. + + d) You may charge a fee for the physical act of transferring a + copy, and you may at your option offer warranty protection in + exchange for a fee. + +Mere aggregation of another independent work with the Program (or its +derivative) on a volume of a storage or distribution medium does not bring +the other work under the scope of these terms. + + 3. 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Such new versions will +be similar in spirit to the present version, but may differ in detail to +address new problems or concerns. + +Each version is given a distinguishing version number. If the Program +specifies a version number of the license which applies to it and "any +later version", you have the option of following the terms and conditions +either of that version or of any later version published by the Free +Software Foundation. If the Program does not specify a version number of +the license, you may choose any version ever published by the Free Software +Foundation. + + 8. If you wish to incorporate parts of the Program into other free +programs whose distribution conditions are different, write to the author +to ask for permission. For software which is copyrighted by the Free +Software Foundation, write to the Free Software Foundation; we sometimes +make exceptions for this. Our decision will be guided by the two goals +of preserving the free status of all derivatives of our free software and +of promoting the sharing and reuse of software generally. + + NO WARRANTY + + 9. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY +FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN +OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES +PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED +OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF +MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS +TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE +PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, +REPAIR OR CORRECTION. + + 10. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR +REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, +INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING +OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED +TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY +YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER +PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE +POSSIBILITY OF SUCH DAMAGES. + + END OF TERMS AND CONDITIONS + + Appendix: How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to humanity, the best way to achieve this is to make it +free software which everyone can redistribute and change under these +terms. + + To do so, attach the following notices to the program. It is safest to +attach them to the start of each source file to most effectively convey +the exclusion of warranty; and each file should have at least the +"copyright" line and a pointer to where the full notice is found. + + + Copyright (C) 19yy + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 1, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA + + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) 19xx name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the +appropriate parts of the General Public License. Of course, the +commands you use may be called something other than `show w' and `show +c'; they could even be mouse-clicks or menu items--whatever suits your +program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the + program `Gnomovision' (a program to direct compilers to make passes + at assemblers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +That's all there is to it! + + +--- The Artistic License 1.0 --- + +This software is Copyright (c) 2017 by Michael Schwern and David Golden. + +This is free software, licensed under: + + The Artistic License 1.0 + +The Artistic License + +Preamble + +The intent of this document is to state the conditions under which a Package +may be copied, such that the Copyright Holder maintains some semblance of +artistic control over the development of the package, while giving the users of +the package the right to use and distribute the Package in a more-or-less +customary fashion, plus the right to make reasonable modifications. + +Definitions: + + - "Package" refers to the collection of files distributed by the Copyright + Holder, and derivatives of that collection of files created through + textual modification. + - "Standard Version" refers to such a Package if it has not been modified, + or has been modified in accordance with the wishes of the Copyright + Holder. + - "Copyright Holder" is whoever is named in the copyright or copyrights for + the package. + - "You" is you, if you're thinking about copying or distributing this Package. + - "Reasonable copying fee" is whatever you can justify on the basis of media + cost, duplication charges, time of people involved, and so on. (You will + not be required to justify it to the Copyright Holder, but only to the + computing community at large as a market that must bear the fee.) + - "Freely Available" means that no fee is charged for the item itself, though + there may be fees involved in handling the item. It also means that + recipients of the item may redistribute it under the same conditions they + received it. + +1. You may make and give away verbatim copies of the source form of the +Standard Version of this Package without restriction, provided that you +duplicate all of the original copyright notices and associated disclaimers. + +2. You may apply bug fixes, portability fixes and other modifications derived +from the Public Domain or from the Copyright Holder. A Package modified in such +a way shall still be considered the Standard Version. + +3. You may otherwise modify your copy of this Package in any way, provided that +you insert a prominent notice in each changed file stating how and when you +changed that file, and provided that you do at least ONE of the following: + + a) place your modifications in the Public Domain or otherwise make them + Freely Available, such as by posting said modifications to Usenet or an + equivalent medium, or placing the modifications on a major archive site + such as ftp.uu.net, or by allowing the Copyright Holder to include your + modifications in the Standard Version of the Package. + + b) use the modified Package only within your corporation or organization. + + c) rename any non-standard executables so the names do not conflict with + standard executables, which must also be provided, and provide a separate + manual page for each non-standard executable that clearly documents how it + differs from the Standard Version. + + d) make other distribution arrangements with the Copyright Holder. + +4. You may distribute the programs of this Package in object code or executable +form, provided that you do at least ONE of the following: + + a) distribute a Standard Version of the executables and library files, + together with instructions (in the manual page or equivalent) on where to + get the Standard Version. + + b) accompany the distribution with the machine-readable source of the Package + with your modifications. + + c) accompany any non-standard executables with their corresponding Standard + Version executables, giving the non-standard executables non-standard + names, and clearly documenting the differences in manual pages (or + equivalent), together with instructions on where to get the Standard + Version. + + d) make other distribution arrangements with the Copyright Holder. + +5. You may charge a reasonable copying fee for any distribution of this +Package. You may charge any fee you choose for support of this Package. You +may not charge a fee for this Package itself. However, you may distribute this +Package in aggregate with other (possibly commercial) programs as part of a +larger (possibly commercial) software distribution provided that you do not +advertise this Package as a product of your own. + +6. The scripts and library files supplied as input to or produced as output +from the programs of this Package do not automatically fall under the copyright +of this Package, but belong to whomever generated them, and may be sold +commercially, and may be aggregated with this Package. + +7. C or perl subroutines supplied by you and linked into this Package shall not +be considered part of this Package. + +8. The name of the Copyright Holder may not be used to endorse or promote +products derived from this software without specific prior written permission. + +9. THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED +WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF +MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + +The End + diff --git a/MANIFEST b/MANIFEST new file mode 100644 index 0000000..8796f79 --- /dev/null +++ b/MANIFEST @@ -0,0 +1,37 @@ +# This file was automatically generated by Dist::Zilla::Plugin::Manifest v6.009. +CONTRIBUTING.mkdn +Changes +LICENSE +MANIFEST +META.json +META.yml +Makefile.PL +README +cpanfile +dist.ini +examples/uplevel-demo.pl +lib/Sub/Uplevel.pm +perlcritic.rc +t/00-report-prereqs.dd +t/00-report-prereqs.t +t/01_die_check.t +t/02_uplevel.t +t/03_nested_uplevels.t +t/04_honor_later_override.t +t/05_honor_prior_override.t +t/06_db_args.t +t/07_uplevel_too_high.t +t/08_exporter.t +t/09_emptylist.t +t/lib/Bar.pm +t/lib/Foo.pm +t/lib/MyImporter.pm +xt/author/00-compile.t +xt/author/critic.t +xt/author/pod-coverage.t +xt/author/pod-spell.t +xt/author/pod-syntax.t +xt/author/portability.t +xt/author/test-version.t +xt/release/distmeta.t +xt/release/minimum-version.t diff --git a/META.json b/META.json new file mode 100644 index 0000000..925f28e --- /dev/null +++ b/META.json @@ -0,0 +1,112 @@ +{ + "abstract" : "apparently run a function in a higher stack frame", + "author" : [ + "Michael Schwern ", + "David Golden " + ], + "dynamic_config" : 0, + "generated_by" : "Dist::Zilla version 6.009, CPAN::Meta::Converter version 2.150010", + "license" : [ + "perl_5" + ], + "meta-spec" : { + "url" : "http://search.cpan.org/perldoc?CPAN::Meta::Spec", + "version" : 2 + }, + "name" : "Sub-Uplevel", + "no_index" : { + "directory" : [ + "corpus", + "examples", + "t", + "xt" + ], + "package" : [ + "DB" + ] + }, + "prereqs" : { + "configure" : { + "requires" : { + "ExtUtils::MakeMaker" : "6.17", + "perl" : "5.006" + } + }, + "develop" : { + "requires" : { + "Dist::Zilla" : "5", + "Dist::Zilla::Plugin::ReleaseStatus::FromVersion" : "0", + "Dist::Zilla::PluginBundle::DAGOLDEN" : "0.073", + "English" : "0", + "File::Spec" : "0", + "File::Temp" : "0", + "IO::Handle" : "0", + "IPC::Open3" : "0", + "Pod::Coverage::TrustPod" : "0", + "Pod::Wordlist" : "0", + "Software::License::Perl_5" : "0", + "Test::CPAN::Meta" : "0", + "Test::MinimumVersion" : "0", + "Test::More" : "0", + "Test::Pod" : "1.41", + "Test::Pod::Coverage" : "1.08", + "Test::Portability::Files" : "0", + "Test::Spelling" : "0.12", + "Test::Version" : "1", + "blib" : "1.01" + } + }, + "runtime" : { + "requires" : { + "Carp" : "0", + "constant" : "0", + "perl" : "5.006", + "strict" : "0", + "warnings" : "0" + } + }, + "test" : { + "recommends" : { + "CPAN::Meta" : "2.120900" + }, + "requires" : { + "Exporter" : "0", + "ExtUtils::MakeMaker" : "0", + "File::Spec" : "0", + "Test::More" : "0", + "lib" : "0", + "perl" : "5.006" + } + } + }, + "provides" : { + "Sub::Uplevel" : { + "file" : "lib/Sub/Uplevel.pm", + "version" : "0.2800" + } + }, + "release_status" : "stable", + "resources" : { + "bugtracker" : { + "web" : "https://github.com/Perl-Toolchain-Gang/Sub-Uplevel/issues" + }, + "homepage" : "https://github.com/Perl-Toolchain-Gang/Sub-Uplevel", + "repository" : { + "type" : "git", + "url" : "https://github.com/Perl-Toolchain-Gang/Sub-Uplevel.git", + "web" : "https://github.com/Perl-Toolchain-Gang/Sub-Uplevel" + } + }, + "version" : "0.2800", + "x_authority" : "cpan:DAGOLDEN", + "x_contributors" : [ + "Adam Kennedy ", + "Alexandr Ciornii ", + "David Golden ", + "Graham Ollis ", + "J. Nick Koston ", + "Michael Gray " + ], + "x_serialization_backend" : "Cpanel::JSON::XS version 3.0225" +} + diff --git a/META.yml b/META.yml new file mode 100644 index 0000000..2e6f62c --- /dev/null +++ b/META.yml @@ -0,0 +1,54 @@ +--- +abstract: 'apparently run a function in a higher stack frame' +author: + - 'Michael Schwern ' + - 'David Golden ' +build_requires: + Exporter: '0' + ExtUtils::MakeMaker: '0' + File::Spec: '0' + Test::More: '0' + lib: '0' + perl: '5.006' +configure_requires: + ExtUtils::MakeMaker: '6.17' + perl: '5.006' +dynamic_config: 0 +generated_by: 'Dist::Zilla version 6.009, CPAN::Meta::Converter version 2.150010' +license: perl +meta-spec: + url: http://module-build.sourceforge.net/META-spec-v1.4.html + version: '1.4' +name: Sub-Uplevel +no_index: + directory: + - corpus + - examples + - t + - xt + package: + - DB +provides: + Sub::Uplevel: + file: lib/Sub/Uplevel.pm + version: '0.2800' +requires: + Carp: '0' + constant: '0' + perl: '5.006' + strict: '0' + warnings: '0' +resources: + bugtracker: https://github.com/Perl-Toolchain-Gang/Sub-Uplevel/issues + homepage: https://github.com/Perl-Toolchain-Gang/Sub-Uplevel + repository: https://github.com/Perl-Toolchain-Gang/Sub-Uplevel.git +version: '0.2800' +x_authority: cpan:DAGOLDEN +x_contributors: + - 'Adam Kennedy ' + - 'Alexandr Ciornii ' + - 'David Golden ' + - 'Graham Ollis ' + - 'J. Nick Koston ' + - 'Michael Gray ' +x_serialization_backend: 'YAML::Tiny version 1.69' diff --git a/Makefile.PL b/Makefile.PL new file mode 100644 index 0000000..9627062 --- /dev/null +++ b/Makefile.PL @@ -0,0 +1,61 @@ +# This file was automatically generated by Dist::Zilla::Plugin::MakeMaker v6.009. +use strict; +use warnings; + +use 5.006; + +use ExtUtils::MakeMaker 6.17; + +my %WriteMakefileArgs = ( + "ABSTRACT" => "apparently run a function in a higher stack frame", + "AUTHOR" => "Michael Schwern , David Golden ", + "CONFIGURE_REQUIRES" => { + "ExtUtils::MakeMaker" => "6.17" + }, + "DISTNAME" => "Sub-Uplevel", + "LICENSE" => "perl", + "MIN_PERL_VERSION" => "5.006", + "NAME" => "Sub::Uplevel", + "PREREQ_PM" => { + "Carp" => 0, + "constant" => 0, + "strict" => 0, + "warnings" => 0 + }, + "TEST_REQUIRES" => { + "Exporter" => 0, + "ExtUtils::MakeMaker" => 0, + "File::Spec" => 0, + "Test::More" => 0, + "lib" => 0 + }, + "VERSION" => "0.2800", + "test" => { + "TESTS" => "t/*.t" + } +); + + +my %FallbackPrereqs = ( + "Carp" => 0, + "Exporter" => 0, + "ExtUtils::MakeMaker" => 0, + "File::Spec" => 0, + "Test::More" => 0, + "constant" => 0, + "lib" => 0, + "strict" => 0, + "warnings" => 0 +); + + +unless ( eval { ExtUtils::MakeMaker->VERSION(6.63_03) } ) { + delete $WriteMakefileArgs{TEST_REQUIRES}; + delete $WriteMakefileArgs{BUILD_REQUIRES}; + $WriteMakefileArgs{PREREQ_PM} = \%FallbackPrereqs; +} + +delete $WriteMakefileArgs{CONFIGURE_REQUIRES} + unless eval { ExtUtils::MakeMaker->VERSION(6.52) }; + +WriteMakefile(%WriteMakefileArgs); diff --git a/README b/README new file mode 100644 index 0000000..0adb4f9 --- /dev/null +++ b/README @@ -0,0 +1,170 @@ +NAME + Sub::Uplevel - apparently run a function in a higher stack frame + +VERSION + version 0.2800 + +SYNOPSIS + use Sub::Uplevel; + + sub foo { + print join " - ", caller; + } + + sub bar { + uplevel 1, \&foo; + } + + #line 11 + bar(); # main - foo.plx - 11 + +DESCRIPTION + Like Tcl's uplevel() function, but not quite so dangerous. The idea is + just to fool caller(). All the really naughty bits of Tcl's uplevel() + are avoided. + + THIS IS NOT THE SORT OF THING YOU WANT TO DO EVERYDAY + + uplevel + uplevel $num_frames, \&func, @args; + + Makes the given function think it's being executed $num_frames + higher than the current stack level. So when they use + caller($frames) it will actually give caller($frames + $num_frames) + for them. + + "uplevel(1, \&some_func, @_)" is effectively "goto &some_func" but + you don't immediately exit the current subroutine. So while you + can't do this: + + sub wrapper { + print "Before\n"; + goto &some_func; + print "After\n"; + } + + you can do this: + + sub wrapper { + print "Before\n"; + my @out = uplevel 1, &some_func; + print "After\n"; + return @out; + } + + "uplevel" has the ability to issue a warning if $num_frames is more + than the current call stack depth, although this warning is disabled + and compiled out by default as the check is relatively expensive. + + To enable the check for debugging or testing, you should set the + global $Sub::Uplevel::CHECK_FRAMES to true before loading + Sub::Uplevel for the first time as follows: + + #!/usr/bin/perl + + BEGIN { + $Sub::Uplevel::CHECK_FRAMES = 1; + } + use Sub::Uplevel; + + Setting or changing the global after the module has been loaded will + have no effect. + +EXAMPLE + The main reason I wrote this module is so I could write wrappers around + functions and they wouldn't be aware they've been wrapped. + + use Sub::Uplevel; + + my $original_foo = \&foo; + + *foo = sub { + my @output = uplevel 1, $original_foo; + print "foo() returned: @output"; + return @output; + }; + + If this code frightens you you should not use this module. + +BUGS and CAVEATS + Well, the bad news is uplevel() is about 5 times slower than a normal + function call. XS implementation anyone? It also slows down every + invocation of caller(), regardless of whether uplevel() is in effect. + + Sub::Uplevel overrides CORE::GLOBAL::caller temporarily for the scope of + each uplevel call. It does its best to work with any previously existing + CORE::GLOBAL::caller (both when Sub::Uplevel is first loaded and within + each uplevel call) such as from Contextual::Return or Hook::LexWrap. + + However, if you are routinely using multiple modules that override + CORE::GLOBAL::caller, you are probably asking for trouble. + + You should load Sub::Uplevel as early as possible within your program. + As with all CORE::GLOBAL overloading, the overload will not affect + modules that have already been compiled prior to the overload. One + module that often is unavoidably loaded prior to Sub::Uplevel is + Exporter. To forcibly recompile Exporter (and Exporter::Heavy) after + loading Sub::Uplevel, use it with the ":aggressive" tag: + + use Sub::Uplevel qw/:aggressive/; + + The private function "Sub::Uplevel::_force_reload()" may be passed a + list of additional modules to reload if ":aggressive" is not aggressive + enough. Reloading modules may break things, so only use this as a last + resort. + + As of version 0.20, Sub::Uplevel requires Perl 5.6 or greater. + +HISTORY + Those who do not learn from HISTORY are doomed to repeat it. + + The lesson here is simple: Don't sit next to a Tcl programmer at the + dinner table. + +THANKS + Thanks to Brent Welch, Damian Conway and Robin Houston. + + See http://www.perl.com/perl/misc/Artistic.html + +SEE ALSO + PadWalker (for the similar idea with lexicals), Hook::LexWrap, Tcl's + uplevel() at http://www.scriptics.com/man/tcl8.4/TclCmd/uplevel.htm + +SUPPORT + Bugs / Feature Requests + Please report any bugs or feature requests through the issue tracker at + . You will be + notified automatically of any progress on your issue. + + Source Code + This is open source software. The code repository is available for + public review and contribution under the terms of the license. + + + + git clone https://github.com/Perl-Toolchain-Gang/Sub-Uplevel.git + +AUTHORS + * Michael Schwern + + * David Golden + +CONTRIBUTORS + * Adam Kennedy + + * Alexandr Ciornii + + * David Golden + + * Graham Ollis + + * J. Nick Koston + + * Michael Gray + +COPYRIGHT AND LICENSE + This software is copyright (c) 2017 by Michael Schwern and David Golden. + + This is free software; you can redistribute it and/or modify it under + the same terms as the Perl 5 programming language system itself. + diff --git a/cpanfile b/cpanfile new file mode 100644 index 0000000..78e128f --- /dev/null +++ b/cpanfile @@ -0,0 +1,46 @@ +requires "Carp" => "0"; +requires "constant" => "0"; +requires "perl" => "5.006"; +requires "strict" => "0"; +requires "warnings" => "0"; + +on 'test' => sub { + requires "Exporter" => "0"; + requires "ExtUtils::MakeMaker" => "0"; + requires "File::Spec" => "0"; + requires "Test::More" => "0"; + requires "lib" => "0"; + requires "perl" => "5.006"; +}; + +on 'test' => sub { + recommends "CPAN::Meta" => "2.120900"; +}; + +on 'configure' => sub { + requires "ExtUtils::MakeMaker" => "6.17"; + requires "perl" => "5.006"; +}; + +on 'develop' => sub { + requires "Dist::Zilla" => "5"; + requires "Dist::Zilla::Plugin::ReleaseStatus::FromVersion" => "0"; + requires "Dist::Zilla::PluginBundle::DAGOLDEN" => "0.073"; + requires "English" => "0"; + requires "File::Spec" => "0"; + requires "File::Temp" => "0"; + requires "IO::Handle" => "0"; + requires "IPC::Open3" => "0"; + requires "Pod::Coverage::TrustPod" => "0"; + requires "Pod::Wordlist" => "0"; + requires "Software::License::Perl_5" => "0"; + requires "Test::CPAN::Meta" => "0"; + requires "Test::MinimumVersion" => "0"; + requires "Test::More" => "0"; + requires "Test::Pod" => "1.41"; + requires "Test::Pod::Coverage" => "1.08"; + requires "Test::Portability::Files" => "0"; + requires "Test::Spelling" => "0.12"; + requires "Test::Version" => "1"; + requires "blib" => "1.01"; +}; diff --git a/dist.ini b/dist.ini new file mode 100644 index 0000000..25d130a --- /dev/null +++ b/dist.ini @@ -0,0 +1,15 @@ +name = Sub-Uplevel +author = Michael Schwern +author = David Golden +license = Perl_5 +copyright_holder = Michael Schwern and David Golden + +[@DAGOLDEN] +:version = 0.073 +stopwords = PadWalker +stopwords = Tcl's +stopwords = Welch +stopwords = uplevel + +[ReleaseStatus::FromVersion] +testing = second_decimal_odd diff --git a/examples/uplevel-demo.pl b/examples/uplevel-demo.pl new file mode 100644 index 0000000..ce3239c --- /dev/null +++ b/examples/uplevel-demo.pl @@ -0,0 +1,23 @@ +use strict; +use warnings; + +use Sub::Uplevel; + +# subroutine A calls subroutine B with uplevel(), so when +# subroutine B queries caller(), it gets main as the caller (just +# like subroutine A) instead of getting subroutine A + +sub sub_a { + print "Entering Subroutine A\n"; + print "caller() says: ", join( ", ", (caller())[0 .. 2] ), "\n"; + print "Calling B with uplevel\n"; + uplevel 1, \&sub_b; +} + +sub sub_b { + print "Entering Subroutine B\n"; + print "caller() says: ", join( ", ", (caller())[0 .. 2] ), "\n"; +} + +sub_a(); + diff --git a/lib/Sub/Uplevel.pm b/lib/Sub/Uplevel.pm new file mode 100644 index 0000000..51ad32f --- /dev/null +++ b/lib/Sub/Uplevel.pm @@ -0,0 +1,610 @@ +package Sub::Uplevel; +use 5.006; +use strict; +# ABSTRACT: apparently run a function in a higher stack frame + +our $VERSION = '0.2800'; + +# Frame check global constant +our $CHECK_FRAMES; +BEGIN { + $CHECK_FRAMES = !! $CHECK_FRAMES; +} +use constant CHECK_FRAMES => $CHECK_FRAMES; + +# We must override *CORE::GLOBAL::caller if it hasn't already been +# overridden or else Perl won't see our local override later. + +if ( not defined *CORE::GLOBAL::caller{CODE} ) { + *CORE::GLOBAL::caller = \&_normal_caller; +} + +# modules to force reload if ":aggressive" is specified +my @reload_list = qw/Exporter Exporter::Heavy/; + +sub import { + no strict 'refs'; ## no critic + my ($class, @args) = @_; + for my $tag ( @args, 'uplevel' ) { + if ( $tag eq 'uplevel' ) { + my $caller = caller(0); + *{"$caller\::uplevel"} = \&uplevel; + } + elsif( $tag eq ':aggressive' ) { + _force_reload( @reload_list ); + } + else { + die qq{"$tag" is not exported by the $class module\n} + } + } + return; +} + +sub _force_reload { + no warnings 'redefine'; + local $^W = 0; + for my $m ( @_ ) { + $m =~ s{::}{/}g; + $m .= ".pm"; + require $m if delete $INC{$m}; + } +} + +#pod =head1 SYNOPSIS +#pod +#pod use Sub::Uplevel; +#pod +#pod sub foo { +#pod print join " - ", caller; +#pod } +#pod +#pod sub bar { +#pod uplevel 1, \&foo; +#pod } +#pod +#pod #line 11 +#pod bar(); # main - foo.plx - 11 +#pod +#pod =head1 DESCRIPTION +#pod +#pod Like Tcl's uplevel() function, but not quite so dangerous. The idea +#pod is just to fool caller(). All the really naughty bits of Tcl's +#pod uplevel() are avoided. +#pod +#pod B +#pod +#pod =over 4 +#pod +#pod =item B +#pod +#pod uplevel $num_frames, \&func, @args; +#pod +#pod Makes the given function think it's being executed $num_frames higher +#pod than the current stack level. So when they use caller($frames) it +#pod will actually give caller($frames + $num_frames) for them. +#pod +#pod C is effectively C but +#pod you don't immediately exit the current subroutine. So while you can't +#pod do this: +#pod +#pod sub wrapper { +#pod print "Before\n"; +#pod goto &some_func; +#pod print "After\n"; +#pod } +#pod +#pod you can do this: +#pod +#pod sub wrapper { +#pod print "Before\n"; +#pod my @out = uplevel 1, &some_func; +#pod print "After\n"; +#pod return @out; +#pod } +#pod +#pod C has the ability to issue a warning if C<$num_frames> is more than +#pod the current call stack depth, although this warning is disabled and compiled +#pod out by default as the check is relatively expensive. +#pod +#pod To enable the check for debugging or testing, you should set the global +#pod C<$Sub::Uplevel::CHECK_FRAMES> to true before loading Sub::Uplevel for the +#pod first time as follows: +#pod +#pod #!/usr/bin/perl +#pod +#pod BEGIN { +#pod $Sub::Uplevel::CHECK_FRAMES = 1; +#pod } +#pod use Sub::Uplevel; +#pod +#pod Setting or changing the global after the module has been loaded will have +#pod no effect. +#pod +#pod =cut + +# @Up_Frames -- uplevel stack +# $Caller_Proxy -- whatever caller() override was in effect before uplevel +our (@Up_Frames, $Caller_Proxy); + +sub _apparent_stack_height { + my $height = 1; # start above this function + while ( 1 ) { + last if ! defined scalar $Caller_Proxy->($height); + $height++; + } + return $height - 1; # subtract 1 for this function +} + +sub uplevel { + # Backwards compatible version of "no warnings 'redefine'" + my $old_W = $^W; + $^W = 0; + + # Update the caller proxy if the uplevel override isn't in effect + local $Caller_Proxy = *CORE::GLOBAL::caller{CODE} + if *CORE::GLOBAL::caller{CODE} != \&_uplevel_caller; + local *CORE::GLOBAL::caller = \&_uplevel_caller; + + # Restore old warnings state + $^W = $old_W; + + if ( CHECK_FRAMES and $_[0] >= _apparent_stack_height() ) { + require Carp; + Carp::carp("uplevel $_[0] is more than the caller stack"); + } + + local @Up_Frames = (shift, @Up_Frames ); + + my $function = shift; + return $function->(@_); +} + +sub _normal_caller (;$) { ## no critic Prototypes + my ($height) = @_; + $height++; + my @caller = CORE::caller($height); + if ( CORE::caller() eq 'DB' ) { + # Oops, redo picking up @DB::args + package DB; + @caller = CORE::caller($height); + } + + return if ! @caller; # empty + return $caller[0] if ! wantarray; # scalar context + return @_ ? @caller : @caller[0..2]; # extra info or regular +} + +sub _uplevel_caller (;$) { ## no critic Prototypes + my $height = $_[0] || 0; + + # shortcut if no uplevels have been called + # always add +1 to CORE::caller (proxy caller function) + # to skip this function's caller + return $Caller_Proxy->( $height + 1 ) if ! @Up_Frames; + +#pod =begin _private +#pod +#pod So it has to work like this: +#pod +#pod Call stack Actual uplevel 1 +#pod CORE::GLOBAL::caller +#pod Carp::short_error_loc 0 +#pod Carp::shortmess_heavy 1 0 +#pod Carp::croak 2 1 +#pod try_croak 3 2 +#pod uplevel 4 +#pod function_that_called_uplevel 5 +#pod caller_we_want_to_see 6 3 +#pod its_caller 7 4 +#pod +#pod So when caller(X) winds up below uplevel(), it only has to use +#pod CORE::caller(X+1) (to skip CORE::GLOBAL::caller). But when caller(X) +#pod winds up no or above uplevel(), it's CORE::caller(X+1+uplevel+1). +#pod +#pod Which means I'm probably going to have to do something nasty like walk +#pod up the call stack on each caller() to see if I'm going to wind up +#pod before or after Sub::Uplevel::uplevel(). +#pod +#pod =end _private +#pod +#pod =begin _dagolden +#pod +#pod I found the description above a bit confusing. Instead, this is the logic +#pod that I found clearer when CORE::GLOBAL::caller is invoked and we have to +#pod walk up the call stack: +#pod +#pod * if searching up to the requested height in the real call stack doesn't find +#pod a call to uplevel, then we can return the result at that height in the +#pod call stack +#pod +#pod * if we find a call to uplevel, we need to keep searching upwards beyond the +#pod requested height at least by the amount of upleveling requested for that +#pod call to uplevel (from the Up_Frames stack set during the uplevel call) +#pod +#pod * additionally, we need to hide the uplevel subroutine call, too, so we search +#pod upwards one more level for each call to uplevel +#pod +#pod * when we've reached the top of the search, we want to return that frame +#pod in the call stack, i.e. the requested height plus any uplevel adjustments +#pod found during the search +#pod +#pod =end _dagolden +#pod +#pod =cut + + my $saw_uplevel = 0; + my $adjust = 0; + + # walk up the call stack to fight the right package level to return; + # look one higher than requested for each call to uplevel found + # and adjust by the amount found in the Up_Frames stack for that call. + # We *must* use CORE::caller here since we need the real stack not what + # some other override says the stack looks like, just in case that other + # override breaks things in some horrible way + my $test_caller; + for ( my $up = 0; $up <= $height + $adjust; $up++ ) { + $test_caller = scalar CORE::caller($up + 1); + if( $test_caller && $test_caller eq __PACKAGE__ ) { + # add one for each uplevel call seen + # and look into the uplevel stack for the offset + $adjust += 1 + $Up_Frames[$saw_uplevel]; + $saw_uplevel++; + } + } + + # For returning values, we pass through the call to the proxy caller + # function, just at a higher stack level + my @caller = $Caller_Proxy->($height + $adjust + 1); + if ( CORE::caller() eq 'DB' ) { + # Oops, redo picking up @DB::args + package DB; + @caller = $Sub::Uplevel::Caller_Proxy->($height + $adjust + 1); + } + + return if ! @caller; # empty + return $caller[0] if ! wantarray; # scalar context + return @_ ? @caller : @caller[0..2]; # extra info or regular +} + +#pod =back +#pod +#pod =head1 EXAMPLE +#pod +#pod The main reason I wrote this module is so I could write wrappers +#pod around functions and they wouldn't be aware they've been wrapped. +#pod +#pod use Sub::Uplevel; +#pod +#pod my $original_foo = \&foo; +#pod +#pod *foo = sub { +#pod my @output = uplevel 1, $original_foo; +#pod print "foo() returned: @output"; +#pod return @output; +#pod }; +#pod +#pod If this code frightens you B +#pod +#pod +#pod =head1 BUGS and CAVEATS +#pod +#pod Well, the bad news is uplevel() is about 5 times slower than a normal +#pod function call. XS implementation anyone? It also slows down every invocation +#pod of caller(), regardless of whether uplevel() is in effect. +#pod +#pod Sub::Uplevel overrides CORE::GLOBAL::caller temporarily for the scope of +#pod each uplevel call. It does its best to work with any previously existing +#pod CORE::GLOBAL::caller (both when Sub::Uplevel is first loaded and within +#pod each uplevel call) such as from Contextual::Return or Hook::LexWrap. +#pod +#pod However, if you are routinely using multiple modules that override +#pod CORE::GLOBAL::caller, you are probably asking for trouble. +#pod +#pod You B load Sub::Uplevel as early as possible within your program. As +#pod with all CORE::GLOBAL overloading, the overload will not affect modules that +#pod have already been compiled prior to the overload. One module that often is +#pod unavoidably loaded prior to Sub::Uplevel is Exporter. To forcibly recompile +#pod Exporter (and Exporter::Heavy) after loading Sub::Uplevel, use it with the +#pod ":aggressive" tag: +#pod +#pod use Sub::Uplevel qw/:aggressive/; +#pod +#pod The private function C may be passed a list of +#pod additional modules to reload if ":aggressive" is not aggressive enough. +#pod Reloading modules may break things, so only use this as a last resort. +#pod +#pod As of version 0.20, Sub::Uplevel requires Perl 5.6 or greater. +#pod +#pod =head1 HISTORY +#pod +#pod Those who do not learn from HISTORY are doomed to repeat it. +#pod +#pod The lesson here is simple: Don't sit next to a Tcl programmer at the +#pod dinner table. +#pod +#pod =head1 THANKS +#pod +#pod Thanks to Brent Welch, Damian Conway and Robin Houston. +#pod +#pod See http://www.perl.com/perl/misc/Artistic.html +#pod +#pod =head1 SEE ALSO +#pod +#pod PadWalker (for the similar idea with lexicals), Hook::LexWrap, +#pod Tcl's uplevel() at http://www.scriptics.com/man/tcl8.4/TclCmd/uplevel.htm +#pod +#pod =cut + +1; + +__END__ + +=pod + +=encoding UTF-8 + +=head1 NAME + +Sub::Uplevel - apparently run a function in a higher stack frame + +=head1 VERSION + +version 0.2800 + +=head1 SYNOPSIS + + use Sub::Uplevel; + + sub foo { + print join " - ", caller; + } + + sub bar { + uplevel 1, \&foo; + } + + #line 11 + bar(); # main - foo.plx - 11 + +=head1 DESCRIPTION + +Like Tcl's uplevel() function, but not quite so dangerous. The idea +is just to fool caller(). All the really naughty bits of Tcl's +uplevel() are avoided. + +B + +=over 4 + +=item B + + uplevel $num_frames, \&func, @args; + +Makes the given function think it's being executed $num_frames higher +than the current stack level. So when they use caller($frames) it +will actually give caller($frames + $num_frames) for them. + +C is effectively C but +you don't immediately exit the current subroutine. So while you can't +do this: + + sub wrapper { + print "Before\n"; + goto &some_func; + print "After\n"; + } + +you can do this: + + sub wrapper { + print "Before\n"; + my @out = uplevel 1, &some_func; + print "After\n"; + return @out; + } + +C has the ability to issue a warning if C<$num_frames> is more than +the current call stack depth, although this warning is disabled and compiled +out by default as the check is relatively expensive. + +To enable the check for debugging or testing, you should set the global +C<$Sub::Uplevel::CHECK_FRAMES> to true before loading Sub::Uplevel for the +first time as follows: + + #!/usr/bin/perl + + BEGIN { + $Sub::Uplevel::CHECK_FRAMES = 1; + } + use Sub::Uplevel; + +Setting or changing the global after the module has been loaded will have +no effect. + +=begin _private + +So it has to work like this: + + Call stack Actual uplevel 1 +CORE::GLOBAL::caller +Carp::short_error_loc 0 +Carp::shortmess_heavy 1 0 +Carp::croak 2 1 +try_croak 3 2 +uplevel 4 +function_that_called_uplevel 5 +caller_we_want_to_see 6 3 +its_caller 7 4 + +So when caller(X) winds up below uplevel(), it only has to use +CORE::caller(X+1) (to skip CORE::GLOBAL::caller). But when caller(X) +winds up no or above uplevel(), it's CORE::caller(X+1+uplevel+1). + +Which means I'm probably going to have to do something nasty like walk +up the call stack on each caller() to see if I'm going to wind up +before or after Sub::Uplevel::uplevel(). + +=end _private + +=begin _dagolden + +I found the description above a bit confusing. Instead, this is the logic +that I found clearer when CORE::GLOBAL::caller is invoked and we have to +walk up the call stack: + +* if searching up to the requested height in the real call stack doesn't find +a call to uplevel, then we can return the result at that height in the +call stack + +* if we find a call to uplevel, we need to keep searching upwards beyond the +requested height at least by the amount of upleveling requested for that +call to uplevel (from the Up_Frames stack set during the uplevel call) + +* additionally, we need to hide the uplevel subroutine call, too, so we search +upwards one more level for each call to uplevel + +* when we've reached the top of the search, we want to return that frame +in the call stack, i.e. the requested height plus any uplevel adjustments +found during the search + +=end _dagolden + +=back + +=head1 EXAMPLE + +The main reason I wrote this module is so I could write wrappers +around functions and they wouldn't be aware they've been wrapped. + + use Sub::Uplevel; + + my $original_foo = \&foo; + + *foo = sub { + my @output = uplevel 1, $original_foo; + print "foo() returned: @output"; + return @output; + }; + +If this code frightens you B + +=head1 BUGS and CAVEATS + +Well, the bad news is uplevel() is about 5 times slower than a normal +function call. XS implementation anyone? It also slows down every invocation +of caller(), regardless of whether uplevel() is in effect. + +Sub::Uplevel overrides CORE::GLOBAL::caller temporarily for the scope of +each uplevel call. It does its best to work with any previously existing +CORE::GLOBAL::caller (both when Sub::Uplevel is first loaded and within +each uplevel call) such as from Contextual::Return or Hook::LexWrap. + +However, if you are routinely using multiple modules that override +CORE::GLOBAL::caller, you are probably asking for trouble. + +You B load Sub::Uplevel as early as possible within your program. As +with all CORE::GLOBAL overloading, the overload will not affect modules that +have already been compiled prior to the overload. One module that often is +unavoidably loaded prior to Sub::Uplevel is Exporter. To forcibly recompile +Exporter (and Exporter::Heavy) after loading Sub::Uplevel, use it with the +":aggressive" tag: + + use Sub::Uplevel qw/:aggressive/; + +The private function C may be passed a list of +additional modules to reload if ":aggressive" is not aggressive enough. +Reloading modules may break things, so only use this as a last resort. + +As of version 0.20, Sub::Uplevel requires Perl 5.6 or greater. + +=head1 HISTORY + +Those who do not learn from HISTORY are doomed to repeat it. + +The lesson here is simple: Don't sit next to a Tcl programmer at the +dinner table. + +=head1 THANKS + +Thanks to Brent Welch, Damian Conway and Robin Houston. + +See http://www.perl.com/perl/misc/Artistic.html + +=head1 SEE ALSO + +PadWalker (for the similar idea with lexicals), Hook::LexWrap, +Tcl's uplevel() at http://www.scriptics.com/man/tcl8.4/TclCmd/uplevel.htm + +=for :stopwords cpan testmatrix url annocpan anno bugtracker rt cpants kwalitee diff irc mailto metadata placeholders metacpan + +=head1 SUPPORT + +=head2 Bugs / Feature Requests + +Please report any bugs or feature requests through the issue tracker +at L. +You will be notified automatically of any progress on your issue. + +=head2 Source Code + +This is open source software. The code repository is available for +public review and contribution under the terms of the license. + +L + + git clone https://github.com/Perl-Toolchain-Gang/Sub-Uplevel.git + +=head1 AUTHORS + +=over 4 + +=item * + +Michael Schwern + +=item * + +David Golden + +=back + +=head1 CONTRIBUTORS + +=for stopwords Adam Kennedy Alexandr Ciornii David Golden Graham Ollis J. Nick Koston Michael Gray + +=over 4 + +=item * + +Adam Kennedy + +=item * + +Alexandr Ciornii + +=item * + +David Golden + +=item * + +Graham Ollis + +=item * + +J. Nick Koston + +=item * + +Michael Gray + +=back + +=head1 COPYRIGHT AND LICENSE + +This software is copyright (c) 2017 by Michael Schwern and David Golden. + +This is free software; you can redistribute it and/or modify it under +the same terms as the Perl 5 programming language system itself. + +=cut diff --git a/perlcritic.rc b/perlcritic.rc new file mode 100644 index 0000000..bcbbb45 --- /dev/null +++ b/perlcritic.rc @@ -0,0 +1,26 @@ +severity = 5 +verbose = 8 + +[Variables::ProhibitPunctuationVars] +allow = $@ $! + +[TestingAndDebugging::ProhibitNoStrict] +allow = refs + +[Variables::ProhibitEvilVariables] +variables = $DB::single + +# Turn these off +[-BuiltinFunctions::ProhibitStringyEval] +[-ControlStructures::ProhibitPostfixControls] +[-ControlStructures::ProhibitUnlessBlocks] +[-Documentation::RequirePodSections] +[-InputOutput::ProhibitInteractiveTest] +[-References::ProhibitDoubleSigils] +[-RegularExpressions::RequireExtendedFormatting] +[-InputOutput::ProhibitTwoArgOpen] +[-Modules::ProhibitEvilModules] + +# Turn this on +[Lax::ProhibitStringyEval::ExceptForRequire] + diff --git a/t/00-report-prereqs.dd b/t/00-report-prereqs.dd new file mode 100644 index 0000000..041801c --- /dev/null +++ b/t/00-report-prereqs.dd @@ -0,0 +1,56 @@ +do { my $x = { + 'configure' => { + 'requires' => { + 'ExtUtils::MakeMaker' => '6.17', + 'perl' => '5.006' + } + }, + 'develop' => { + 'requires' => { + 'Dist::Zilla' => '5', + 'Dist::Zilla::Plugin::ReleaseStatus::FromVersion' => '0', + 'Dist::Zilla::PluginBundle::DAGOLDEN' => '0.073', + 'English' => '0', + 'File::Spec' => '0', + 'File::Temp' => '0', + 'IO::Handle' => '0', + 'IPC::Open3' => '0', + 'Pod::Coverage::TrustPod' => '0', + 'Pod::Wordlist' => '0', + 'Software::License::Perl_5' => '0', + 'Test::CPAN::Meta' => '0', + 'Test::MinimumVersion' => '0', + 'Test::More' => '0', + 'Test::Pod' => '1.41', + 'Test::Pod::Coverage' => '1.08', + 'Test::Portability::Files' => '0', + 'Test::Spelling' => '0.12', + 'Test::Version' => '1', + 'blib' => '1.01' + } + }, + 'runtime' => { + 'requires' => { + 'Carp' => '0', + 'constant' => '0', + 'perl' => '5.006', + 'strict' => '0', + 'warnings' => '0' + } + }, + 'test' => { + 'recommends' => { + 'CPAN::Meta' => '2.120900' + }, + 'requires' => { + 'Exporter' => '0', + 'ExtUtils::MakeMaker' => '0', + 'File::Spec' => '0', + 'Test::More' => '0', + 'lib' => '0', + 'perl' => '5.006' + } + } + }; + $x; + } \ No newline at end of file diff --git a/t/00-report-prereqs.t b/t/00-report-prereqs.t new file mode 100644 index 0000000..e338372 --- /dev/null +++ b/t/00-report-prereqs.t @@ -0,0 +1,183 @@ +#!perl + +use strict; +use warnings; + +# This test was generated by Dist::Zilla::Plugin::Test::ReportPrereqs 0.025 + +use Test::More tests => 1; + +use ExtUtils::MakeMaker; +use File::Spec; + +# from $version::LAX +my $lax_version_re = + qr/(?: undef | (?: (?:[0-9]+) (?: \. | (?:\.[0-9]+) (?:_[0-9]+)? )? + | + (?:\.[0-9]+) (?:_[0-9]+)? + ) | (?: + v (?:[0-9]+) (?: (?:\.[0-9]+)+ (?:_[0-9]+)? )? + | + (?:[0-9]+)? (?:\.[0-9]+){2,} (?:_[0-9]+)? + ) + )/x; + +# hide optional CPAN::Meta modules from prereq scanner +# and check if they are available +my $cpan_meta = "CPAN::Meta"; +my $cpan_meta_pre = "CPAN::Meta::Prereqs"; +my $HAS_CPAN_META = eval "require $cpan_meta; $cpan_meta->VERSION('2.120900')" && eval "require $cpan_meta_pre"; ## no critic + +# Verify requirements? +my $DO_VERIFY_PREREQS = 1; + +sub _max { + my $max = shift; + $max = ( $_ > $max ) ? $_ : $max for @_; + return $max; +} + +sub _merge_prereqs { + my ($collector, $prereqs) = @_; + + # CPAN::Meta::Prereqs object + if (ref $collector eq $cpan_meta_pre) { + return $collector->with_merged_prereqs( + CPAN::Meta::Prereqs->new( $prereqs ) + ); + } + + # Raw hashrefs + for my $phase ( keys %$prereqs ) { + for my $type ( keys %{ $prereqs->{$phase} } ) { + for my $module ( keys %{ $prereqs->{$phase}{$type} } ) { + $collector->{$phase}{$type}{$module} = $prereqs->{$phase}{$type}{$module}; + } + } + } + + return $collector; +} + +my @include = qw( + +); + +my @exclude = qw( + +); + +# Add static prereqs to the included modules list +my $static_prereqs = do 't/00-report-prereqs.dd'; + +# Merge all prereqs (either with ::Prereqs or a hashref) +my $full_prereqs = _merge_prereqs( + ( $HAS_CPAN_META ? $cpan_meta_pre->new : {} ), + $static_prereqs +); + +# Add dynamic prereqs to the included modules list (if we can) +my ($source) = grep { -f } 'MYMETA.json', 'MYMETA.yml'; +if ( $source && $HAS_CPAN_META + && (my $meta = eval { CPAN::Meta->load_file($source) } ) +) { + $full_prereqs = _merge_prereqs($full_prereqs, $meta->prereqs); +} +else { + $source = 'static metadata'; +} + +my @full_reports; +my @dep_errors; +my $req_hash = $HAS_CPAN_META ? $full_prereqs->as_string_hash : $full_prereqs; + +# Add static includes into a fake section +for my $mod (@include) { + $req_hash->{other}{modules}{$mod} = 0; +} + +for my $phase ( qw(configure build test runtime develop other) ) { + next unless $req_hash->{$phase}; + next if ($phase eq 'develop' and not $ENV{AUTHOR_TESTING}); + + for my $type ( qw(requires recommends suggests conflicts modules) ) { + next unless $req_hash->{$phase}{$type}; + + my $title = ucfirst($phase).' '.ucfirst($type); + my @reports = [qw/Module Want Have/]; + + for my $mod ( sort keys %{ $req_hash->{$phase}{$type} } ) { + next if $mod eq 'perl'; + next if grep { $_ eq $mod } @exclude; + + my $file = $mod; + $file =~ s{::}{/}g; + $file .= ".pm"; + my ($prefix) = grep { -e File::Spec->catfile($_, $file) } @INC; + + my $want = $req_hash->{$phase}{$type}{$mod}; + $want = "undef" unless defined $want; + $want = "any" if !$want && $want == 0; + + my $req_string = $want eq 'any' ? 'any version required' : "version '$want' required"; + + if ($prefix) { + my $have = MM->parse_version( File::Spec->catfile($prefix, $file) ); + $have = "undef" unless defined $have; + push @reports, [$mod, $want, $have]; + + if ( $DO_VERIFY_PREREQS && $HAS_CPAN_META && $type eq 'requires' ) { + if ( $have !~ /\A$lax_version_re\z/ ) { + push @dep_errors, "$mod version '$have' cannot be parsed ($req_string)"; + } + elsif ( ! $full_prereqs->requirements_for( $phase, $type )->accepts_module( $mod => $have ) ) { + push @dep_errors, "$mod version '$have' is not in required range '$want'"; + } + } + } + else { + push @reports, [$mod, $want, "missing"]; + + if ( $DO_VERIFY_PREREQS && $type eq 'requires' ) { + push @dep_errors, "$mod is not installed ($req_string)"; + } + } + } + + if ( @reports ) { + push @full_reports, "=== $title ===\n\n"; + + my $ml = _max( map { length $_->[0] } @reports ); + my $wl = _max( map { length $_->[1] } @reports ); + my $hl = _max( map { length $_->[2] } @reports ); + + if ($type eq 'modules') { + splice @reports, 1, 0, ["-" x $ml, "", "-" x $hl]; + push @full_reports, map { sprintf(" %*s %*s\n", -$ml, $_->[0], $hl, $_->[2]) } @reports; + } + else { + splice @reports, 1, 0, ["-" x $ml, "-" x $wl, "-" x $hl]; + push @full_reports, map { sprintf(" %*s %*s %*s\n", -$ml, $_->[0], $wl, $_->[1], $hl, $_->[2]) } @reports; + } + + push @full_reports, "\n"; + } + } +} + +if ( @full_reports ) { + diag "\nVersions for all modules listed in $source (including optional ones):\n\n", @full_reports; +} + +if ( @dep_errors ) { + diag join("\n", + "\n*** WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING ***\n", + "The following REQUIRED prerequisites were not satisfied:\n", + @dep_errors, + "\n" + ); +} + +pass; + +# vim: ts=4 sts=4 sw=4 et: diff --git a/t/01_die_check.t b/t/01_die_check.t new file mode 100644 index 0000000..fab017e --- /dev/null +++ b/t/01_die_check.t @@ -0,0 +1,18 @@ +#!/usr/bin/perl + +# Kirk: How we deal with death is at least as important as how we deal +# with life, wouldn't you say? +# Saavik: As I indicated, Admiral, that thought had not occurred to me. +# Kirk: Well, now you have something new to think about. Carry on. + +# XXX DG: Why is this test here? Seems pointless. Oh, well. + +use strict; +BEGIN { $^W = 1 } + +use Test::More tests => 1; + +#line 12 +eval { die }; +is( $@, "Died at $0 line 12.\n" ); + diff --git a/t/02_uplevel.t b/t/02_uplevel.t new file mode 100644 index 0000000..5d7e454 --- /dev/null +++ b/t/02_uplevel.t @@ -0,0 +1,211 @@ +#!/usr/bin/perl + +use strict; +BEGIN { $^W = 1 } + +use Test::More tests => 23; + +BEGIN { use_ok('Sub::Uplevel'); } +can_ok('Sub::Uplevel', 'uplevel'); +can_ok(__PACKAGE__, 'uplevel'); + +#line 11 +ok( !caller, "top-level caller() not screwed up" ); + +eval { die }; +is( $@, "Died at $0 line 13.\n", 'die() not screwed up' ); + +sub foo { + join " - ", caller; +} + +sub bar { + uplevel(1, \&foo); +} + +#line 25 +is( bar(), "main - $0 - 25", 'uplevel()' ); + + +# Sure, but does it fool die? +sub try_die { + die "You must die! I alone am best!"; +} + +sub wrap_die { + uplevel(1, \&try_die); +} + +# line 38 +eval { wrap_die() }; +is( $@, "You must die! I alone am best! at $0 line 30.\n", 'die() fooled' ); + + +# how about warn? +sub try_warn { + warn "HA! You don't fool me!"; +} + +sub wrap_warn { + uplevel(1, \&try_warn); +} + + +my $warning; +{ + local $SIG{__WARN__} = sub { $warning = join '', @_ }; +#line 56 + wrap_warn(); +} +is( $warning, "HA! You don't fool me! at $0 line 44.\n", 'warn() fooled' ); + + +# Carp? +use Carp; +sub try_croak { +# line 64 + croak("Now we can fool croak!"); +} + +sub wrap_croak { +# line 68 + uplevel(shift, \&try_croak); +} + + +# depending on perl version, we could get 'require 0' or 'eval {...}' +# in the stack. This test used to be 'require 0' for <= 5.006, but +# it broke on 5.005_05 test release, so we'll just take either +# line 72 +eval { wrap_croak(1) }; +my $croak_regex = quotemeta( <<"CARP" ); +Now we can fool croak! at $0 line 64 + main::wrap_croak(1) called at $0 line 72 +CARP +$croak_regex =~ s/64/64\.?/; # Perl 5.15 series Carp adds period +$croak_regex .= '\t(require 0|eval \{\.\.\.\})' + . quotemeta( " called at $0 line 72" ); +like( $@, "/$croak_regex/", 'croak() fooled'); + +# Try to wrap higher -- this may have been a problem that was exposed on +# Test Exception +# line 75 +eval { wrap_croak(2) }; +$croak_regex = quotemeta( <<"CARP" ); +Now we can fool croak! at $0 line 64 +CARP +$croak_regex =~ s/64/64\.?/; # Perl 5.15 series Carp adds period +like( $@, "/$croak_regex/", 'croak() fooled'); + +#line 79 +ok( !caller, "caller() not screwed up" ); + +eval { die "Dying" }; +is( $@, "Dying at $0 line 81.\n", 'die() not screwed up' ); + + + +# how about carp? +sub try_carp { +# line 88 + carp "HA! Even carp is fooled!"; +} + +sub wrap_carp { + uplevel(1, \&try_carp); +} + + +$warning = ''; +{ + local $SIG{__WARN__} = sub { $warning = join '', @_ }; +#line 98 + wrap_carp(); +} +my $carp_regex = quotemeta( <<"CARP" ); +HA! Even carp is fooled! at $0 line 88 + main::wrap_carp() called at $0 line 98 +CARP +$carp_regex =~ s/88/88\.?/; # Perl 5.15 series Carp adds period +like( $warning, "/$carp_regex/", 'carp() fooled' ); + + +use lib 't/lib'; +use Foo; +can_ok( 'main', 'fooble' ); + +#line 114 +sub core_caller_check { + return CORE::caller(0); +} + +sub caller_check { + return caller(shift); +} + +is_deeply( [ ( caller_check(0), 0, 4 )[0 .. 3] ], + ['main', $0, 122, 'main::caller_check' ], + 'caller check' ); + +is( (() = caller_check(0)), (() = core_caller_check(0)) , + "caller() with args returns right number of values" +); + +sub core_caller_no_args { + return CORE::caller(); +} + +sub caller_no_args { + return caller(); +} + +is( (() = caller_no_args()), (() = core_caller_no_args()), + "caller() with no args returns right number of values" +); + +sub deep_caller { + return caller(1); +} + +sub check_deep_caller { + deep_caller(); +} + +#line 134 +is_deeply([(check_deep_caller)[0..2]], ['main', $0, 134], 'shallow caller' ); + +sub deeper { deep_caller() } # caller 0 +sub still_deeper { deeper() } # caller 1 -- should give this line, 137 +sub ever_deeper { still_deeper() } # caller 2 + +is_deeply([(ever_deeper)[0..2]], ['main', $0, 137], 'deep caller()' ); + +# This uplevel() should not effect deep_caller's caller(1). +sub yet_deeper { uplevel( 1, \&ever_deeper) } +is_deeply([(yet_deeper)[0..2]], ['main', $0, 137], 'deep caller() + uplevel' ); + +sub target { caller } +sub yarrow { uplevel( 1, \&target ) } +sub hock { uplevel( 1, \&yarrow ) } + +is_deeply([(hock)], ['main', $0, 150], 'nested uplevel()s' ); + +# Deep caller inside uplevel +package Delegator; +# line 159 +sub delegate { main::caller_check(shift) } + +package Wrapper; +use Sub::Uplevel; +sub wrap { uplevel( 1, \&Delegator::delegate, @_ ) } + +package main; + +is( (Wrapper::wrap(0))[0], 'Delegator', + 'deep caller check of parent sees real calling package' +); + +is( (Wrapper::wrap(1))[0], 'main', + 'deep caller check of grandparent sees package above uplevel' +); + diff --git a/t/03_nested_uplevels.t b/t/03_nested_uplevels.t new file mode 100644 index 0000000..fe0dcac --- /dev/null +++ b/t/03_nested_uplevels.t @@ -0,0 +1,81 @@ +#!/usr/bin/perl + +use strict; +BEGIN { $^W = 1 } + +use Test::More; + +use Sub::Uplevel; + +package Wrap; +use Sub::Uplevel; + +sub wrap { + my ($n, $f, $depth, $up, @case) = @_; + + if ($n > 1) { + $n--; + return wrap( $n, $f, $depth, $up, @case ); + } + else { + return uplevel( $up , $f, $depth, $up, @case ); + } +} + +package Call; + +sub recurse_call_check { + my ($depth, $up, @case) = @_; + + if ( $depth ) { + $depth--; + my @result; + push @result, recurse_call_check($depth, $up, @case, 'Call' ); + for my $n ( 1 .. $up ) { + push @result, Wrap::wrap( $n, \&recurse_call_check, + $depth, $n, @case, + $n == 1 ? "Wrap(Call)" : "Wrap(Call) x $n" ), + ; + } + return @result; + } + else { + my (@uplevel_callstack, @real_callstack); + my $i = 0; + while ( defined( my $caller = caller($i++) ) ) { + push @uplevel_callstack, $caller; + } + $i = 0; + while ( defined( my $caller = CORE::caller($i++) ) ) { + push @real_callstack, $caller; + } + return [ + join( q{, }, @case ), + join( q{, }, reverse @uplevel_callstack ), + join( q{, }, reverse @real_callstack ), + ]; + } +} + +package main; + +my $depth = 4; +my $up = 3; +my $cases = 104; + +plan tests => $cases; + +my @results = Call::recurse_call_check( $depth, $up, 'Call' ); + +is( scalar @results, $cases, + "Right number of cases" +); + +my $expected = shift @results; + +for my $got ( @results ) { + is( $got->[1], $expected->[1], + "Case: $got->[0]" + ) or diag( "Real callers: $got->[2]" ); +} + diff --git a/t/04_honor_later_override.t b/t/04_honor_later_override.t new file mode 100644 index 0000000..de1608b --- /dev/null +++ b/t/04_honor_later_override.t @@ -0,0 +1,83 @@ +#!/usr/bin/perl + +use strict; +BEGIN { $^W = 1 } + +use Test::More tests => 7; + +# Goal of these tests: confirm that Sub::Uplevel will honor (use) a +# CORE::GLOBAL::caller that occurs after Sub::Uplevel is loaded + +#--------------------------------------------------------------------------# +# define a custom caller function that reverses the package name +#--------------------------------------------------------------------------# + +sub _reverse_caller(;$) { + my $height = $_[0]; + my @caller = CORE::caller(++$height); + $caller[0] = defined $caller[0] ? reverse $caller[0] : undef; + if( wantarray and !@_ ) { + return @caller[0..2]; + } + elsif (wantarray) { + return @caller; + } + else { + return $caller[0]; + } +} + +#--------------------------------------------------------------------------# +# load Sub::Uplevel then redefine CORE::GLOBAL::caller +#--------------------------------------------------------------------------# + +BEGIN { + ok( ! defined *CORE::GLOBAL::caller{CODE}, + "no global override yet" + ); + + use_ok('Sub::Uplevel'); + + is( *CORE::GLOBAL::caller{CODE}, \&Sub::Uplevel::_normal_caller, + "Sub::Uplevel's normal caller override in place" + ); + + # old style no warnings 'redefine' + my $old_W = $^W; + $^W = 0; + + *CORE::GLOBAL::caller = \&_reverse_caller; + $^W = $old_W + +} + +is( *CORE::GLOBAL::caller{CODE}, \&_reverse_caller, + "added new, custom caller override" +); + +#--------------------------------------------------------------------------# +# define subs *after* caller has been redefined in BEGIN +#--------------------------------------------------------------------------# + +sub test_caller { return scalar caller } + +sub uplevel_caller { return uplevel 1, \&test_caller } + +sub test_caller_w_uplevel { return uplevel_caller } + +#--------------------------------------------------------------------------# +# Test for reversed package name both inside and outside an uplevel call +#--------------------------------------------------------------------------# + +is( scalar caller(), undef, + "caller from main package is undef" +); + +is( test_caller(), reverse("main"), + "caller from subroutine calls custom routine" +); + +is( test_caller_w_uplevel(), reverse("main"), + "caller from uplevel subroutine calls custom routine" +); + diff --git a/t/05_honor_prior_override.t b/t/05_honor_prior_override.t new file mode 100644 index 0000000..e70e7f7 --- /dev/null +++ b/t/05_honor_prior_override.t @@ -0,0 +1,94 @@ +#!/usr/bin/perl + +use strict; +BEGIN { $^W = 1 } + +use Test::More tests => 10; + +# Goal of these tests: confirm that Sub::Uplevel will honor (use) a +# CORE::GLOBAL::caller override that occurs prior to Sub::Uplevel loading + +#--------------------------------------------------------------------------# +# define a custom caller function that increments a counter +#--------------------------------------------------------------------------# + +my $caller_counter = 0; +sub _count_caller(;$) { + $caller_counter++; + my $height = $_[0]; + my @caller = CORE::caller(++$height); + if( wantarray and !@_ ) { + return @caller[0..2]; + } + elsif (wantarray) { + return @caller; + } + else { + return $caller[0]; + } +} + +#--------------------------------------------------------------------------# +# redefine CORE::GLOBAL::caller then load Sub::Uplevel +#--------------------------------------------------------------------------# + +BEGIN { + ok( ! defined *CORE::GLOBAL::caller{CODE}, + "no global override yet" + ); + + { + # old style no warnings 'redefine' + my $old_W = $^W; + $^W = 0; + *CORE::GLOBAL::caller = \&_count_caller; + $^W = $old_W; + } + + is( *CORE::GLOBAL::caller{CODE}, \&_count_caller, + "added custom caller override" + ); + + use_ok('Sub::Uplevel'); + + is( *CORE::GLOBAL::caller{CODE}, \&_count_caller, + "custom caller override still in place" + ); + + +} + +#--------------------------------------------------------------------------# +# define subs *after* caller has been redefined in BEGIN +#--------------------------------------------------------------------------# + +sub test_caller { return scalar caller } + +sub uplevel_caller { return uplevel 1, \&test_caller } + +sub test_caller_w_uplevel { return uplevel_caller } + +#--------------------------------------------------------------------------# +# Test for reversed package name both inside and outside an uplevel call +#--------------------------------------------------------------------------# + +my $old_caller_counter; + +$old_caller_counter = $caller_counter; +is( scalar caller(), undef, + "caller from main package is undef" +); +ok( $caller_counter > $old_caller_counter, "custom caller() was used" ); + +$old_caller_counter = $caller_counter; +is( test_caller(), "main", + "caller from subroutine is main" +); +ok( $caller_counter > $old_caller_counter, "custom caller() was used" ); + +$old_caller_counter = $caller_counter; +is( test_caller_w_uplevel(), "main", + "caller from uplevel subroutine is main" +); +ok( $caller_counter > $old_caller_counter, "custom caller() was used" ); + diff --git a/t/06_db_args.t b/t/06_db_args.t new file mode 100644 index 0000000..9c3414b --- /dev/null +++ b/t/06_db_args.t @@ -0,0 +1,34 @@ +#!/usr/bin/perl + +use strict; +BEGIN { $^W = 1 } + +use Test::More tests => 3; + +BEGIN { use_ok('Sub::Uplevel'); } + +sub get_caller_args { + package DB; + my @x = caller(1); + return @DB::args; +} + +sub addition { + my $x; + $x += $_ for @_; + return $x; +} + +sub wrap_addition { + my @args = get_caller_args(); + my $sum = uplevel 1, \&addition, @_; + return ($sum, @args); +} + +my ($sum, @args) = wrap_addition(1, 2, 3); + +is($sum, 6, "wrapper returned value correct"); +is_deeply( \@args, [1, 2, 3], "wrapper returned args correct" ); + + + diff --git a/t/07_uplevel_too_high.t b/t/07_uplevel_too_high.t new file mode 100644 index 0000000..5a4a417 --- /dev/null +++ b/t/07_uplevel_too_high.t @@ -0,0 +1,33 @@ +#!/usr/bin/perl + +use strict; +BEGIN { $^W = 1 } + +use Test::More tests => 5; + +BEGIN { + $Sub::Uplevel::CHECK_FRAMES = 1; + use_ok('Sub::Uplevel'); +} + +sub show_caller { + return scalar caller; +} + +sub wrap_show_caller { + my $uplevel = shift; + return uplevel $uplevel, \&show_caller; +} + +my $warning = ''; +local $SIG{__WARN__} = sub { $warning = shift }; + +my $caller = wrap_show_caller(1); +is($caller, 'main', "wrapper returned correct caller"); +is( $warning, '', "don't warn if ordinary uplevel" ); + +$warning = ''; +$caller = wrap_show_caller(2); +my $file = __FILE__; +is($caller, undef, "wrapper returned correct caller"); +like( $warning, qr/uplevel 2 is more than the caller stack/, "warn if too much uplevel" ); diff --git a/t/08_exporter.t b/t/08_exporter.t new file mode 100644 index 0000000..5e055e4 --- /dev/null +++ b/t/08_exporter.t @@ -0,0 +1,19 @@ +#!/usr/bin/perl + +use strict; +BEGIN { $^W = 1 } + +use Test::More; + +plan tests => 1; + +# Goal of these tests: confirm that Sub::Uplevel will work with Exporter's +# import() function + +package main; +use lib 't/lib'; +require MyImporter; +require Bar; +MyImporter::import_for_me('Bar','func3'); +can_ok('main','func3'); + diff --git a/t/09_emptylist.t b/t/09_emptylist.t new file mode 100644 index 0000000..d3cb059 --- /dev/null +++ b/t/09_emptylist.t @@ -0,0 +1,34 @@ +#!/usr/bin/perl + +use strict; +BEGIN { $^W = 1 } + +use Test::More; + +use Sub::Uplevel; + +plan tests => 3; + +sub get_caller { + return caller(shift); +} + +sub wrapper { + my $height = shift; + return uplevel 1, \&get_caller, $height; +} + +{ + my @caller = wrapper(0); + ok(scalar @caller, "caller(N) in stack returns list"); +} + +{ + my @caller = wrapper(1); + is(scalar @caller, 0, "caller(N) out of stack returns empty list"); +} + +{ + my @caller = caller; + is(scalar @caller, 0, "caller from main returns empty list"); +} diff --git a/t/lib/Bar.pm b/t/lib/Bar.pm new file mode 100644 index 0000000..b4efcb4 --- /dev/null +++ b/t/lib/Bar.pm @@ -0,0 +1,8 @@ +package Bar; +use warnings; +use strict; +require Exporter; +our @ISA = qw(Exporter); +our @EXPORT_OK = qw( func3 ); +sub func3 { 3 } +1; diff --git a/t/lib/Foo.pm b/t/lib/Foo.pm new file mode 100644 index 0000000..ea5f2bd --- /dev/null +++ b/t/lib/Foo.pm @@ -0,0 +1,8 @@ +package Foo; + +# Hook::LexWrap does this, Sub::Uplevel appears to interfere. +sub import { *{caller()."::fooble"} = \&fooble } + +sub fooble { 42 } + +1; diff --git a/t/lib/MyImporter.pm b/t/lib/MyImporter.pm new file mode 100644 index 0000000..0ddcc77 --- /dev/null +++ b/t/lib/MyImporter.pm @@ -0,0 +1,15 @@ +package MyImporter; +use warnings; +use strict; +use Sub::Uplevel qw/:aggressive/; +sub import_for_me { + my ($pkg, @p) = @_; + my $level = 1; + my $import = $pkg->can('import'); + if ($import) { + uplevel $level, $import, ($pkg, @p); + } else { + warn "no import in $pkg\n"; + } +} +1; diff --git a/xt/author/00-compile.t b/xt/author/00-compile.t new file mode 100644 index 0000000..7b452f1 --- /dev/null +++ b/xt/author/00-compile.t @@ -0,0 +1,63 @@ +use 5.006; +use strict; +use warnings; + +# this test was generated with Dist::Zilla::Plugin::Test::Compile 2.056 + +use Test::More; + +plan tests => 2; + +my @module_files = ( + 'Sub/Uplevel.pm' +); + + + +# fake home for cpan-testers +use File::Temp; +local $ENV{HOME} = File::Temp::tempdir( CLEANUP => 1 ); + + +my @switches = ( + -d 'blib' ? '-Mblib' : '-Ilib', +); + +use File::Spec; +use IPC::Open3; +use IO::Handle; + +open my $stdin, '<', File::Spec->devnull or die "can't open devnull: $!"; + +my @warnings; +for my $lib (@module_files) +{ + # see L + my $stderr = IO::Handle->new; + + diag('Running: ', join(', ', map { my $str = $_; $str =~ s/'/\\'/g; q{'} . $str . q{'} } + $^X, @switches, '-e', "require q[$lib]")) + if $ENV{PERL_COMPILE_TEST_DEBUG}; + + my $pid = open3($stdin, '>&STDERR', $stderr, $^X, @switches, '-e', "require q[$lib]"); + binmode $stderr, ':crlf' if $^O eq 'MSWin32'; + my @_warnings = <$stderr>; + waitpid($pid, 0); + is($?, 0, "$lib loaded ok"); + + shift @_warnings if @_warnings and $_warnings[0] =~ /^Using .*\bblib/ + and not eval { require blib; blib->VERSION('1.01') }; + + if (@_warnings) + { + warn @_warnings; + push @warnings, @_warnings; + } +} + + + +is(scalar(@warnings), 0, 'no warnings found') + or diag 'got warnings: ', ( Test::More->can('explain') ? Test::More::explain(\@warnings) : join("\n", '', @warnings) ); + + diff --git a/xt/author/critic.t b/xt/author/critic.t new file mode 100644 index 0000000..d5b4c96 --- /dev/null +++ b/xt/author/critic.t @@ -0,0 +1,12 @@ +#!perl + +use strict; +use warnings; + +use Test::More; +use English qw(-no_match_vars); + +eval "use Test::Perl::Critic"; +plan skip_all => 'Test::Perl::Critic required to criticise code' if $@; +Test::Perl::Critic->import( -profile => "perlcritic.rc" ) if -e "perlcritic.rc"; +all_critic_ok(); diff --git a/xt/author/pod-coverage.t b/xt/author/pod-coverage.t new file mode 100644 index 0000000..66b3b64 --- /dev/null +++ b/xt/author/pod-coverage.t @@ -0,0 +1,7 @@ +#!perl +# This file was automatically generated by Dist::Zilla::Plugin::PodCoverageTests. + +use Test::Pod::Coverage 1.08; +use Pod::Coverage::TrustPod; + +all_pod_coverage_ok({ coverage_class => 'Pod::Coverage::TrustPod' }); diff --git a/xt/author/pod-spell.t b/xt/author/pod-spell.t new file mode 100644 index 0000000..22b8656 --- /dev/null +++ b/xt/author/pod-spell.t @@ -0,0 +1,41 @@ +use strict; +use warnings; +use Test::More; + +# generated by Dist::Zilla::Plugin::Test::PodSpelling 2.007004 +use Test::Spelling 0.12; +use Pod::Wordlist; + + +add_stopwords(); +all_pod_files_spelling_ok( qw( bin lib ) ); +__DATA__ +Adam +Alexandr +Ciornii +David +Golden +Graham +Gray +Kennedy +Koston +Michael +Nick +Ollis +PadWalker +Schwern +Sub +Tcl's +Uplevel +Welch +adamk +alexchorny +and +dagolden +lib +mg13 +mschwern +nick +plicease +uplevel +xdg diff --git a/xt/author/pod-syntax.t b/xt/author/pod-syntax.t new file mode 100644 index 0000000..e563e5d --- /dev/null +++ b/xt/author/pod-syntax.t @@ -0,0 +1,7 @@ +#!perl +# This file was automatically generated by Dist::Zilla::Plugin::PodSyntaxTests. +use strict; use warnings; +use Test::More; +use Test::Pod 1.41; + +all_pod_files_ok(); diff --git a/xt/author/portability.t b/xt/author/portability.t new file mode 100644 index 0000000..f6ac836 --- /dev/null +++ b/xt/author/portability.t @@ -0,0 +1,10 @@ +use strict; +use warnings; + +use Test::More; + +eval 'use Test::Portability::Files'; +plan skip_all => 'Test::Portability::Files required for testing portability' + if $@; +options(test_one_dot => 0); +run_tests(); diff --git a/xt/author/test-version.t b/xt/author/test-version.t new file mode 100644 index 0000000..247ba9a --- /dev/null +++ b/xt/author/test-version.t @@ -0,0 +1,23 @@ +use strict; +use warnings; +use Test::More; + +# generated by Dist::Zilla::Plugin::Test::Version 1.09 +use Test::Version; + +my @imports = qw( version_all_ok ); + +my $params = { + is_strict => 0, + has_version => 1, + multiple => 0, + +}; + +push @imports, $params + if version->parse( $Test::Version::VERSION ) >= version->parse('1.002'); + +Test::Version->import(@imports); + +version_all_ok; +done_testing; diff --git a/xt/release/distmeta.t b/xt/release/distmeta.t new file mode 100644 index 0000000..c2280dc --- /dev/null +++ b/xt/release/distmeta.t @@ -0,0 +1,6 @@ +#!perl +# This file was automatically generated by Dist::Zilla::Plugin::MetaTests. + +use Test::CPAN::Meta; + +meta_yaml_ok(); diff --git a/xt/release/minimum-version.t b/xt/release/minimum-version.t new file mode 100644 index 0000000..708ba15 --- /dev/null +++ b/xt/release/minimum-version.t @@ -0,0 +1,8 @@ +#!perl + +use Test::More; + +eval "use Test::MinimumVersion"; +plan skip_all => "Test::MinimumVersion required for testing minimum versions" + if $@; +all_minimum_version_ok( qq{5.010} );