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Document assert capture limitation

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Petr Písař 2016-10-24 10:22:56 +02:00
parent ec745f21c3
commit 249ffc0f72
2 changed files with 46 additions and 1 deletions
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38
pcre2-10.22-Document-current-assert-capture-limitation.patch Normal file
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@ -0,0 +1,38 @@
From 3e67484ef38a7c13619ea44f18047644d8f49dca Mon Sep 17 00:00:00 2001
From: ph10 <ph10@6239d852-aaf2-0410-a92c-79f79f948069>
Date: Sun, 23 Oct 2016 15:43:42 +0000
Subject: [PATCH] Document current assert capture limitation.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
git-svn-id: svn://vcs.exim.org/pcre2/code/trunk@575 6239d852-aaf2-0410-a92c-79f79f948069
Petr Písař: Ported to 10.22.
Signed-off-by: Petr Písař <ppisar@redhat.com>
---
doc/pcre2pattern.3 | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/doc/pcre2pattern.3 b/doc/pcre2pattern.3
index 57b0014..3ca1088 100644
--- a/doc/pcre2pattern.3
+++ b/doc/pcre2pattern.3
@@ -2219,6 +2219,13 @@ numbering the capturing subpatterns in the whole pattern. However, substring
capturing is carried out only for positive assertions. (Perl sometimes, but not
always, does do capturing in negative assertions.)
.P
+WARNING: If a positive assertion containing one or more capturing subpatterns
+succeeds, but failure to match later in the pattern causes backtracking over
+this assertion, the captures within the assertion are reset only if no higher
+numbered captures are already set. This is, unfortunately, a fundamental
+limitation of the current implementation; it may get removed in a future
+reworking.
+.P
For compatibility with Perl, most assertion subpatterns may be repeated; though
it makes no sense to assert the same thing several times, the side effect of
capturing parentheses may occasionally be useful. However, an assertion that
--
2.7.4

9
pcre2.spec
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@ -2,7 +2,7 @@
#%%global rcversion RC1
Name: pcre2
Version: 10.22
Release: %{?rcversion:0.}4%{?rcversion:.%rcversion}%{?dist}
Release: %{?rcversion:0.}5%{?rcversion:.%rcversion}%{?dist}
%global myversion %{version}%{?rcversion:-%rcversion}
Summary: Perl-compatible regular expression library
Group: System Environment/Libraries
@ -46,6 +46,9 @@ Patch7: pcre2-10.22-Fix-documentation-error.patch
# Fix optimization bugs for patterns starting with lookaheads,
# in upstream after 10.22, upstream bug #1882
Patch8: pcre2-10.22-Fix-optimization-bugs-when-pattern-starts-with-looka.patch
# Document assert capture limitation, in upstream after 10.22,
# upstream bug #1887
Patch9: pcre2-10.22-Document-current-assert-capture-limitation.patch
# New libtool to get rid of RPATH and to use distribution autotools
BuildRequires: autoconf
BuildRequires: automake
@ -131,6 +134,7 @@ Utilities demonstrating PCRE2 capabilities like pcre2grep or pcre2test.
%patch6 -p1
%patch7 -p1
%patch8 -p1
%patch9 -p1
# Because of multilib patch
libtoolize --copy --force
autoreconf -vif
@ -227,6 +231,9 @@ make %{?_smp_mflags} check VERBOSE=yes
%{_mandir}/man1/pcre2test.*
%changelog
* Mon Oct 24 2016 Petr Pisar <ppisar@redhat.com> - 10.22-5
- Document assert capture limitation (upstream bug #1887)
* Wed Oct 19 2016 Richard W.M. Jones <@redhat.com> - 10.22-4
- Disable the JIT on riscv64.