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Make ParseLines much faster using bytes.IndexByte

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This commit is contained in:
bloeys
2022-07-24 05:37:20 +04:00
parent bea69429f9
commit 4c458c3c55
1 changed files with 17 additions and 11 deletions
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28
main.go
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@ -1,6 +1,7 @@
package main package main
import ( import (
"bytes"
"fmt" "fmt"
"io" "io"
"math" "math"
@ -667,19 +668,24 @@ func (p *program) HandleReturn() {
func (p *program) ParseLines(bs []byte) { func (p *program) ParseLines(bs []byte) {
for i := uint64(0); i < uint64(len(bs)); i++ { checkedBytes := uint64(0)
for len(bs) > 0 {
b := bs[i] // IndexByte is assembly optimized for different platforms and is much faster than checking one byte at a time
if b == '\n' { index := bytes.IndexByte(bs, '\n')
if index == -1 {
break
}
bs = bs[index+1:]
if p.CurrLineValid { checkedBytes += uint64(index + 1)
p.CurrLine.EndIndex = p.textBuf.WrittenElements + i if p.CurrLineValid {
p.WriteLine(&p.CurrLine) p.CurrLine.EndIndex = p.textBuf.WrittenElements + checkedBytes - 1
p.CurrLine.StartIndex = p.textBuf.WrittenElements + i p.WriteLine(&p.CurrLine)
} else { p.CurrLine.StartIndex = p.textBuf.WrittenElements + checkedBytes - 1
p.CurrLine.StartIndex = p.textBuf.WrittenElements + i } else {
p.CurrLineValid = true p.CurrLine.StartIndex = p.textBuf.WrittenElements + checkedBytes - 1
} p.CurrLineValid = true
} }
} }
} }