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filter: Special case for absolute paths

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name                          old time/op    new time/op    delta
FilterPatterns/Relative-4       23.6ms ±20%    22.7ms ± 5%     ~     (p=0.684 n=10+10)
FilterPatterns/Absolute-4       32.3ms ± 8%    14.2ms ±13%  -56.01%  (p=0.000 n=10+10)
FilterPatterns/Wildcard-4        334ms ±17%     266ms ±16%  -20.56%  (p=0.000 n=10+10)
FilterPatterns/ManyNoMatch-4     709ms ± 7%     554ms ± 6%  -21.89%  (p=0.000 n=10+10)

name                          old alloc/op   new alloc/op   delta
FilterPatterns/Relative-4       3.57MB ± 0%    3.57MB ± 0%   +0.00%  (p=0.046 n=9+10)
FilterPatterns/Absolute-4       3.57MB ± 0%    3.57MB ± 0%     ~     (p=0.464 n=10+10)
FilterPatterns/Wildcard-4        141MB ± 0%     141MB ± 0%     ~     (p=0.163 n=9+10)
FilterPatterns/ManyNoMatch-4    3.57MB ± 0%    3.57MB ± 0%     ~     (all equal)

name                          old allocs/op  new allocs/op  delta
FilterPatterns/Relative-4        22.2k ± 0%     22.2k ± 0%     ~     (all equal)
FilterPatterns/Absolute-4        22.2k ± 0%     22.2k ± 0%     ~     (all equal)
FilterPatterns/Wildcard-4        1.63M ± 0%     1.63M ± 0%     ~     (p=0.072 n=10+10)
FilterPatterns/ManyNoMatch-4     22.2k ± 0%     22.2k ± 0%     ~     (all equal)
This commit is contained in:
Michael Eischer 2019-07-06 22:12:24 +02:00
parent 375c2a56de
commit 7959796269
1 changed files with 6 additions and 1 deletions
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7
internal/filter/filter.go
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@ -149,8 +149,13 @@ func match(patterns Pattern, strs []string) (matched bool, err error) {
} }
if len(patterns) <= len(strs) { if len(patterns) <= len(strs) {
maxOffset := len(strs) - len(patterns)
// special case absolute patterns
if patterns[0] == "" {
maxOffset = 0
}
outer: outer:
for offset := len(strs) - len(patterns); offset >= 0; offset-- { for offset := maxOffset; offset >= 0; offset-- {
for i := len(patterns) - 1; i >= 0; i-- { for i := len(patterns) - 1; i >= 0; i-- {
ok, err := filepath.Match(patterns[i], strs[offset+i]) ok, err := filepath.Match(patterns[i], strs[offset+i])