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ansi: speed up escape sequence parsing (#2927)

This commit is contained in:
Charlie Vieth 2022-08-25 01:02:08 -04:00 committed by GitHub
parent 9d041aa582
commit 209d5e8e90
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1 changed files with 14 additions and 6 deletions
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20
src/ansi.go
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@ -107,19 +107,27 @@ func matchControlSequence(s string) int {
// ^ match starting here
//
i := 2 // prefix matched in nextAnsiEscapeSequence()
for ; i < len(s) && (isNumeric(s[i]) || s[i] == ';' || s[i] == ':' || s[i] == '?'); i++ {
}
if i < len(s) {
for ; i < len(s); i++ {
c := s[i]
if 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' || c == '@' {
return i + 1
switch c {
case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ';', ':', '?':
// ok
default:
if 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' || c == '@' {
return i + 1
}
return -1
}
}
return -1
}
func isCtrlSeqStart(c uint8) bool {
return c == '\\' || c == '[' || c == '(' || c == ')'
switch c {
case '\\', '[', '(', ')':
return true
}
return false
}
// nextAnsiEscapeSequence returns the ANSI escape sequence and is equivalent to