40 lines
867 B
Go
40 lines
867 B
Go
package kong
|
|
|
|
import "unicode/utf8"
|
|
|
|
// Copied from https://github.com/daviddengcn/go-algs/blob/fe23fabd9d0670e4675326040ba7c285c7117b4c/ed/ed.go#L31
|
|
// License: https://github.com/daviddengcn/go-algs/blob/fe23fabd9d0670e4675326040ba7c285c7117b4c/LICENSE
|
|
func levenshtein(a, b string) int {
|
|
f := make([]int, utf8.RuneCountInString(b)+1)
|
|
|
|
for j := range f {
|
|
f[j] = j
|
|
}
|
|
|
|
for _, ca := range a {
|
|
j := 1
|
|
fj1 := f[0] // fj1 is the value of f[j - 1] in last iteration
|
|
f[0]++
|
|
for _, cb := range b {
|
|
mn := min(f[j]+1, f[j-1]+1) // delete & insert
|
|
if cb != ca {
|
|
mn = min(mn, fj1+1) // change
|
|
} else {
|
|
mn = min(mn, fj1) // matched
|
|
}
|
|
|
|
fj1, f[j] = f[j], mn // save f[j] to fj1(j is about to increase), update f[j] to mn
|
|
j++
|
|
}
|
|
}
|
|
|
|
return f[len(f)-1]
|
|
}
|
|
|
|
func min(a, b int) int { //nolint:predeclared
|
|
if a <= b {
|
|
return a
|
|
}
|
|
return b
|
|
}
|