From: Junio C Hamano <gitster@pobox.com>
To: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Cc: git@vger.kernel.org, Jeff King <peff@peff.net>,
J Smith <dark.panda@gmail.com>, Joe Ratterman <jratt0@gmail.com>,
Fredrik Kuivinen <frekui@gmail.com>
Subject: Re: [PATCH v2 5/6] grep: remove regflags from the public grep_opt API
Date: Fri, 30 Jun 2017 10:20:11 -0700 [thread overview]
Message-ID: <xmqqwp7ts88k.fsf@gitster.mtv.corp.google.com> (raw)
In-Reply-To: <20170629222222.4694-6-avarab@gmail.com> ("Ævar Arnfjörð Bjarmason"'s message of "Thu, 29 Jun 2017 22:22:21 +0000")
Ævar Arnfjörð Bjarmason <avarab@gmail.com> writes:
> @@ -169,6 +167,24 @@ void grep_init(struct grep_opt *opt, const char *prefix)
>
> static void grep_set_pattern_type_option(enum grep_pattern_type pattern_type, struct grep_opt *opt)
> {
> + /*
> + * When committing to the pattern type by setting the relevant
> + * fields in grep_opt it's generally not necessary to zero out
> + * the fields we're not choosing, since they won't have been
> + * set by anything. The extended_regexp_option field is the
> + * only exception to this.
> + *
> + * This is because in the process of parsing grep.patternType
> + * & grep.extendedRegexp we set opt->pattern_type_option and
> + * opt->extended_regexp_option, respectively. We then
> + * internally use opt->extended_regexp_option to see if we're
> + * compiling an ERE. It must be unset if that's not actually
> + * the case.
> + */
> + if (pattern_type != GREP_PATTERN_TYPE_ERE &&
> + opt->extended_regexp_option)
> + opt->extended_regexp_option = 0;
Good to have the reasoning in an in-code comment like the above.
But after reading these two paragraphs and then before reading the
three line code, a more natural embodiment in the code of the
commentary that came to my mind was
if (pattern_type != GREP_PATTERN_TYPE_ERE)
opt->extended_regexp_option = 0;
The end-result is the same as yours, of course, but I somehow found
it match the reasoning better.
Now, I wonder if this can further be tweaked to
opt->extended_regexp_option = (pattern_type == GREP_PATTERN_TYPE_ERE);
which might lead us in a direction to really unify the two related
fields extended_regexp_option and pattern_type_option.
Even if that were a good longer term direction to go in, it is
outside the scope of this step, of course. I am merely bringing it
up as an conversation item ;-).
next prev parent reply other threads:[~2017-06-30 17:20 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-20 21:42 [PATCH v3 00/30] Easy to review grep & pre-PCRE changes Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 01/30] Makefile & configure: reword inaccurate comment about PCRE Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 02/30] grep & rev-list doc: stop promising libpcre for --perl-regexp Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 03/30] test-lib: rename the LIBPCRE prerequisite to PCRE Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 04/30] log: add exhaustive tests for pattern style options & config Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 05/30] log: make --regexp-ignore-case work with --perl-regexp Ævar Arnfjörð Bjarmason
2017-05-20 23:50 ` Junio C Hamano
2017-05-21 6:58 ` Ævar Arnfjörð Bjarmason
2017-05-22 0:17 ` Junio C Hamano
2017-06-28 21:58 ` [PATCH 0/5] grep: remove redundant code & reflags from API Ævar Arnfjörð Bjarmason
2017-06-29 22:22 ` [PATCH v2 0/6] " Ævar Arnfjörð Bjarmason
2017-06-29 22:22 ` [PATCH v2 1/6] grep: remove redundant double assignment to 0 Ævar Arnfjörð Bjarmason
2017-06-29 22:22 ` [PATCH v2 2/6] grep: adjust a redundant grep pattern type assignment Ævar Arnfjörð Bjarmason
2017-06-29 22:22 ` [PATCH v2 3/6] grep: remove redundant "fixed" field re-assignment to 0 Ævar Arnfjörð Bjarmason
2017-06-29 22:22 ` [PATCH v2 4/6] grep: remove redundant and verbose re-assignments " Ævar Arnfjörð Bjarmason
2017-06-29 22:22 ` [PATCH v2 5/6] grep: remove regflags from the public grep_opt API Ævar Arnfjörð Bjarmason
2017-06-30 17:20 ` Junio C Hamano [this message]
2017-06-29 22:22 ` [PATCH v2 6/6] grep: remove redundant REG_NEWLINE when compiling fixed regex Ævar Arnfjörð Bjarmason
2017-06-28 21:58 ` [PATCH 1/5] grep: remove redundant double assignment to 0 Ævar Arnfjörð Bjarmason
2017-06-28 21:58 ` [PATCH 2/5] grep: remove redundant grep pattern type assignment Ævar Arnfjörð Bjarmason
2017-06-29 17:03 ` Stefan Beller
2017-06-29 17:50 ` Ævar Arnfjörð Bjarmason
2017-06-28 21:58 ` [PATCH 3/5] grep: remove redundant "fixed" field re-assignment to 0 Ævar Arnfjörð Bjarmason
2017-06-29 17:10 ` Stefan Beller
2017-06-28 21:58 ` [PATCH 4/5] grep: remove redundant and verbose re-assignments " Ævar Arnfjörð Bjarmason
2017-06-28 21:58 ` [PATCH 5/5] grep: remove regflags from the public grep_opt API Ævar Arnfjörð Bjarmason
2017-06-29 17:43 ` Stefan Beller
2017-06-29 18:16 ` Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 06/30] grep: add a test asserting that --perl-regexp dies when !PCRE Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 07/30] grep: add a test for backreferences in PCRE patterns Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 08/30] grep: change non-ASCII -i test to stop using --debug Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 09/30] grep: add tests for --threads=N and grep.threads Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 10/30] grep: amend submodule recursion test for regex engine testing Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 11/30] grep: add tests for grep pattern types being passed to submodules Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 12/30] grep: add a test helper function for less verbose -f \0 tests Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 13/30] grep: prepare for testing binary regexes containing rx metacharacters Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 14/30] grep: add tests to fix blind spots with \0 patterns Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 15/30] perf: add a GIT_PERF_MAKE_COMMAND for when *_MAKE_OPTS won't do Ævar Arnfjörð Bjarmason
2017-05-20 23:50 ` Junio C Hamano
2017-05-21 6:23 ` Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 16/30] perf: emit progress output when unpacking & building Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 17/30] perf: add a comparison test of grep regex engines Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 18/30] perf: add a comparison test of grep regex engines with -F Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 19/30] perf: add a comparison test of log --grep regex engines Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 20/30] grep: catch a missing enum in switch statement Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 21/30] grep: remove redundant regflags assignments Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 22/30] grep: factor test for \0 in grep patterns into a function Ævar Arnfjörð Bjarmason
2017-05-23 21:17 ` Brandon Williams
2017-05-20 21:42 ` [PATCH v3 23/30] grep: change the internal PCRE macro names to be PCRE1 Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 24/30] grep: change internal *pcre* variable & function names to be *pcre1* Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 25/30] grep: move is_fixed() earlier to avoid forward declaration Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 26/30] test-lib: add a PTHREADS prerequisite Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 27/30] pack-objects & index-pack: add test for --threads warning Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 28/30] pack-objects: fix buggy warning about threads Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 29/30] grep: given --threads with NO_PTHREADS=YesPlease, warn Ævar Arnfjörð Bjarmason
2017-05-20 21:42 ` [PATCH v3 30/30] grep: assert that threading is enabled when calling grep_{lock,unlock} Ævar Arnfjörð Bjarmason
2017-05-20 23:50 ` [PATCH v3 00/30] Easy to review grep & pre-PCRE changes Junio C Hamano
2017-05-23 19:24 ` [PATCH v2 0/7] PCRE v2, PCRE v1 JIT, log -P & fixes Ævar Arnfjörð Bjarmason
2017-05-23 19:24 ` [PATCH v2 1/7] grep: don't redundantly compile throwaway patterns under threading Ævar Arnfjörð Bjarmason
2017-05-24 4:42 ` Junio C Hamano
2017-05-25 10:33 ` Ævar Arnfjörð Bjarmason
2017-05-26 0:58 ` Junio C Hamano
2017-05-26 8:06 ` Ævar Arnfjörð Bjarmason
2017-05-26 9:49 ` Junio C Hamano
2017-05-23 19:24 ` [PATCH v2 2/7] grep: skip pthreads overhead when using one thread Ævar Arnfjörð Bjarmason
2017-05-24 4:45 ` Junio C Hamano
2017-05-23 19:24 ` [PATCH v2 3/7] log: add -P as a synonym for --perl-regexp Ævar Arnfjörð Bjarmason
2017-05-23 19:24 ` [PATCH v2 4/7] grep: add support for the PCRE v1 JIT API Ævar Arnfjörð Bjarmason
2017-05-24 5:17 ` Junio C Hamano
2017-05-24 7:37 ` Ævar Arnfjörð Bjarmason
2017-05-23 19:24 ` [PATCH v2 5/7] grep: un-break building with PCRE < 8.32 Ævar Arnfjörð Bjarmason
2017-05-24 6:00 ` Junio C Hamano
2017-05-24 6:38 ` Junio C Hamano
2017-05-23 19:24 ` [PATCH v2 6/7] grep: un-break building with PCRE < 8.20 Ævar Arnfjörð Bjarmason
2017-05-23 19:24 ` [PATCH v2 7/7] grep: add support for PCRE v2 Ævar Arnfjörð Bjarmason
2017-05-24 6:23 ` Junio C Hamano
2017-05-25 9:49 ` Ævar Arnfjörð Bjarmason
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