From: Eric Wong <e@yhbt.net>
To: meta@public-inbox.org
Subject: [PATCH 6/6] viewdiff: favor `qr' to precompile regexps
Date: Thu, 19 Mar 2020 03:32:56 -0500 [thread overview]
Message-ID: <20200319083256.15593-7-e@yhbt.net> (raw)
In-Reply-To: <20200319083256.15593-1-e@yhbt.net>
We can also avoid `o' regexp modifier, since it isn't
recommended by Perl upstream, anymore (although we don't
have any bugs or unintended behavior because of it).
---
lib/PublicInbox/ViewDiff.pm | 47 ++++++++++++++++++++-----------------
1 file changed, 26 insertions(+), 21 deletions(-)
diff --git a/lib/PublicInbox/ViewDiff.pm b/lib/PublicInbox/ViewDiff.pm
index 57a1b5d6..d22c80b9 100644
--- a/lib/PublicInbox/ViewDiff.pm
+++ b/lib/PublicInbox/ViewDiff.pm
@@ -25,7 +25,23 @@ my $ANY = qr![^\n]!;
my $FN = qr!(?:"?[^/\n]+/[^\n]+|/dev/null)!;
# cf. git diff.c :: get_compact_summary
-my $DIFFSTAT_COMMENT = qr/\((?:new|gone|(?:(?:new|mode) [\+\-][lx]))\)/;
+my $DIFFSTAT_COMMENT =
+ qr/(?: *\((?:new|gone|(?:(?:new|mode) [\+\-][lx]))\))? *\z/s;
+my $NULL_TO_BLOB = qr/^(index $OID_NULL\.\.)($OID_BLOB)\b/ms;
+my $BLOB_TO_NULL = qr/^index ($OID_BLOB)(\.\.$OID_NULL)\b/ms;
+my $BLOB_TO_BLOB = qr/^index ($OID_BLOB)\.\.($OID_BLOB)/ms;
+my $EXTRACT_DIFFS = qr/(
+ (?: # begin header stuff, don't capture filenames, here,
+ # but instead wait for the --- and +++ lines.
+ (?:^diff\x20--git\x20$FN\x20$FN$LF)
+
+ # old mode || new mode || copy|rename|deleted|...
+ (?:^[a-z]$ANY+$LF)*
+ )? # end of optional stuff, everything below is required
+ ^index\x20($OID_BLOB)\.\.($OID_BLOB)$ANY*$LF
+ ^---\x20($FN)$LF
+ ^\+{3}\x20($FN)$LF)/msx;
+my $IS_OID = qr/\A$OID_BLOB\z/s;
# link to line numbers in blobs
sub diff_hunk ($$$$) {
@@ -62,7 +78,7 @@ sub anchor0 ($$$$) {
# So only do best-effort handling of renames for common cases;
# which works well in practice. If projects put "=>", or trailing
# spaces in filenames, oh well :P
- $fn =~ s/(?: *$DIFFSTAT_COMMENT)? *\z//so;
+ $fn =~ s/$DIFFSTAT_COMMENT//;
$fn =~ s/{(?:.+) => (.+)}/$1/ or $fn =~ s/.* => (.+)/$1/;
$fn = git_unquote($fn);
@@ -132,18 +148,17 @@ sub diff_header ($$$$) {
# no need to capture oid_a and oid_b on add/delete,
# we just linkify OIDs directly via s///e in conditional
- if (($$x =~ s/^(index $OID_NULL\.\.)($OID_BLOB)\b/
- $1 . oid($dctx, $spfx, $2)/emos) ||
- ($$x =~ s/^index ($OID_BLOB)(\.\.$OID_NULL)\b/
- 'index ' . oid($dctx, $spfx, $1) . $2/emos)) {
- } elsif ($$x =~ /^index ($OID_BLOB)\.\.($OID_BLOB)/mos) {
+ if (($$x =~ s/$NULL_TO_BLOB/$1 . oid($dctx, $spfx, $2)/e) ||
+ ($$x =~ s/$BLOB_TO_NULL/
+ 'index ' . oid($dctx, $spfx, $1) . $2/e)) {
+ } elsif ($$x =~ $BLOB_TO_BLOB) {
# modification-only, not add/delete:
# linkify hunk headers later using oid_a and oid_b
@$dctx{qw(oid_a oid_b)} = ($1, $2);
} else {
warn "BUG? <$$x> had no ^index line";
}
- $$x =~ s!^diff --git!anchor1($ctx, $pb) // 'diff --git'!emos;
+ $$x =~ s!^diff --git!anchor1($ctx, $pb) // 'diff --git'!ems;
$$dst .= qq(<span\nclass="head">);
$$dst .= $$x;
$$dst .= '</span>';
@@ -174,17 +189,7 @@ sub diff_before_or_after ($$$) {
sub flush_diff ($$$) {
my ($dst, $ctx, $cur) = @_;
- my @top = split(/(
- (?: # begin header stuff, don't capture filenames, here,
- # but instead wait for the --- and +++ lines.
- (?:^diff\x20--git\x20$FN\x20$FN$LF)
-
- # old mode || new mode || copy|rename|deleted|...
- (?:^[a-z]$ANY+$LF)*
- )? # end of optional stuff, everything below is required
- ^index\x20($OID_BLOB)\.\.($OID_BLOB)$ANY*$LF
- ^---\x20($FN)$LF
- ^\+{3}\x20($FN)$LF)/smxo, $$cur);
+ my @top = split($EXTRACT_DIFFS, $$cur);
$$cur = undef;
my $linkify = $ctx->{-linkify};
@@ -192,8 +197,8 @@ sub flush_diff ($$$) {
while (defined(my $x = shift @top)) {
if (scalar(@top) >= 4 &&
- $top[1] =~ /\A$OID_BLOB\z/os &&
- $top[0] =~ /\A$OID_BLOB\z/os) {
+ $top[1] =~ $IS_OID &&
+ $top[0] =~ $IS_OID) {
$dctx = diff_header($dst, \$x, $ctx, \@top);
} elsif ($dctx) {
my $after = '';
next prev parent reply other threads:[~2020-03-19 8:32 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-19 8:32 [PATCH 0/6] daemon: reduce fragmentation via preload Eric Wong
2020-03-19 8:32 ` [PATCH 1/6] www: update ->preload for newer modules Eric Wong
2020-03-19 8:32 ` [PATCH 2/6] wwwlisting: favor "use" over require Eric Wong
2020-03-19 8:32 ` [PATCH 3/6] wwwlisting: avoid lazy loading JSON module Eric Wong
2020-03-21 1:10 ` [PATCH 0/2] wwwlisting: fixup warnings :x Eric Wong
2020-03-21 1:10 ` [PATCH 1/2] wwwlisting: use first successfully loaded JSON module Eric Wong
2020-03-21 1:10 ` [PATCH 2/2] t/www_listing: avoid 'once' warnings Eric Wong
2020-03-21 5:24 ` [PATCH v2] " Eric Wong
2020-03-19 8:32 ` [PATCH 4/6] www: avoid `state' usage to perform allocations up-front Eric Wong
2020-03-19 8:32 ` [PATCH 5/6] daemon: do more immortal allocations up front Eric Wong
2020-03-19 8:32 ` Eric Wong [this message]
2020-04-21 8:52 ` Encode preloading Eric Wong
2020-05-08 1:59 ` [PATCH] www: preload: load all encodings at startup Eric Wong
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