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go-mtree/vendor/github.com/xrash/smetrics/soundex.go

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package smetrics
import (
"strings"
)
// The Soundex encoding. It is a phonetic algorithm that considers how the words sound in English. Soundex maps a string to a 4-byte code consisting of the first letter of the original string and three numbers. Strings that sound similar should map to the same code.
func Soundex(s string) string {
m := map[byte]string{
'B': "1", 'P': "1", 'F': "1", 'V': "1",
'C': "2", 'S': "2", 'K': "2", 'G': "2", 'J': "2", 'Q': "2", 'X': "2", 'Z': "2",
'D': "3", 'T': "3",
'L': "4",
'M': "5", 'N': "5",
'R': "6",
}
s = strings.ToUpper(s)
r := string(s[0])
p := s[0]
for i := 1; i < len(s) && len(r) < 4; i++ {
c := s[i]
if (c < 'A' || c > 'Z') || (c == p) {
continue
}
p = c
if n, ok := m[c]; ok {
r += n
}
}
for i := len(r); i < 4; i++ {
r += "0"
}
return r
}