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Speed up ANSI code processing (#2368)

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This commit speeds up the parsing/processing of ANSI escape codes by
roughly 7.5x. The speedup is mostly accomplished by replacing the regex
with dedicated parsing logic (nextAnsiEscapeSequence()) and reducing the
number of allocations in extractColor().

#### Benchmarks
```
name             old time/op    new time/op     delta
ExtractColor-16    4.89µs ± 5%     0.64µs ± 2%   -86.87%  (p=0.000 n=9+9)

name             old speed      new speed       delta
ExtractColor-16  25.6MB/s ± 5%  194.6MB/s ± 2%  +661.43%  (p=0.000 n=9+9)

name             old alloc/op   new alloc/op    delta
ExtractColor-16    1.37kB ± 0%     0.31kB ± 0%   -77.31%  (p=0.000 n=10+10)

name             old allocs/op  new allocs/op   delta
ExtractColor-16      48.0 ± 0%        4.0 ± 0%   -91.67%  (p=0.000 n=10+10)
```
This commit is contained in:
Charlie Vieth
2021-03-11 05:34:50 -05:00
committed by GitHub
parent f4e1ed25f2
commit 5a874ae241
3 changed files with 431 additions and 76 deletions
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5
Makefile
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@@ -73,6 +73,9 @@ test: $(SOURCES)
github.com/junegunn/fzf/src/tui \
github.com/junegunn/fzf/src/util
bench:
cd src && SHELL=/bin/sh GOOS= $(GO) test -v -tags "$(TAGS)" -run=Bench -bench=. -benchmem
install: bin/fzf
build:
@@ -153,4 +156,4 @@ update:
$(GO) get -u
$(GO) mod tidy
.PHONY: all build release test install clean docker docker-test update
.PHONY: all build release test bench install clean docker docker-test update