31 lines
503 B
Go
31 lines
503 B
Go
|
// +build solution
|
||
|
|
|
||
|
|
package utf8spacecollapse
|
||
|
|
|
||
|
|
import (
|
||
|
|
"unicode"
|
||
|
|
"unicode/utf8"
|
||
|
|
)
|
||
|
|
|
||
|
|
func CollapseSpaces(input string) string {
|
||
|
|
res := make([]byte, len(input))
|
||
|
|
pos := 0
|
||
|
|
lastWasSpace := false
|
||
|
|
for len(input) > 0 {
|
||
|
|
r, n := utf8.DecodeRuneInString(input)
|
||
|
|
input = input[n:]
|
||
|
|
if unicode.IsSpace(r) {
|
||
|
|
if lastWasSpace {
|
||
|
|
continue
|
||
|
|
}
|
||
|
|
res[pos] = ' '
|
||
|
|
pos++
|
||
|
|
lastWasSpace = true
|
||
|
|
} else {
|
||
|
|
pos += utf8.EncodeRune(res[pos:], r)
|
||
|
|
lastWasSpace = false
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return string(res[:pos])
|
||
|
|
}
|