/
double_metaphone.go
458 lines (449 loc) · 12.2 KB
/
double_metaphone.go
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package text
import (
"strings"
"golang.org/x/exp/utf8string"
)
// Ruby implementation of the Double Metaphone algorithm by Lawrence Philips,
// originally published in the June 2000 issue of C/C++ Users Journal.
//
// Based on double_metaphone.rb from https://github.com/threedaymonk/text
//
// Returns the primary and secondary double metaphone tokens (the secondary
// will be nil if equal to the primary).
func DoubleMetaphone(str string) (string, string) {
primary := make([]string, 0, 5)
secondary := make([]string, 0, 5)
original := utf8string.NewString(strings.ToUpper(str))
current := 0
if mm(ss(original, 0, 2), []string{"GN", "KN", "PN", "WR", "PS"}) {
current += 1
}
if ss(original, 0, 1) == "X" {
primary = append(primary, "S")
secondary = append(secondary, "S")
current += 1
}
for len(primary) < 4 || len(secondary) < 4 {
if current > original.RuneCount() {
break
}
p, s, n := doubleMetaphoneLookup(original, current)
if p != "" {
primary = append(primary, p)
}
if s != "" {
secondary = append(secondary, s)
}
current += n
}
p := strings.Join(primary, "")
if len(p) > 4 {
p = p[0:4]
}
s := strings.Join(secondary, "")
if len(s) > 4 {
s = s[0:4]
}
if p == s {
return p, ""
}
return p, s
}
func slavoGermanic(s *utf8string.String) bool {
str := s.String()
return strings.Contains(str, "W") ||
strings.Contains(str, "K") ||
strings.Contains(str, "CZ") ||
strings.Contains(str, "WITZ")
}
func vowel(str string) bool {
return str == "A" || str == "E" || str == "I" || str == "O" || str == "U" || str == "Y"
}
func mm(str string, matches []string) bool {
for _, s := range(matches) {
if s == str {
return true
}
}
return false
}
func ss(str *utf8string.String, pos, length int) string {
p0, p1 := pos, pos + length
if p0 < 0 {
p0 = 0
}
l := p1 - p0
if p1 > str.RuneCount() {
p1 = str.RuneCount()
}
s := str.Slice(p0, p1)
if l > (p1 - p0) {
s = s + strings.Repeat(" ", l - (p1 - p0))
}
return s
}
func doubleMetaphoneLookup(str *utf8string.String, pos int) (string, string, int) {
switch ss(str, pos, 1) {
case "A", "E", "I", "O", "U", "Y":
if 0 == pos {
return "A", "A", 1
} else {
return "", "", 1
}
case "B":
n := 1
if str.RuneCount() > pos + 1 && "B" == ss(str, pos + 1, 1) {
n = 2
}
return "P", "P", n
case "Ç":
return "S", "S", 1
case "C":
if pos > 1 &&
!vowel(ss(str, pos - 2, 1)) &&
"ACH" == ss(str, pos - 1, 3) &&
ss(str, pos + 2, 1) != "I" && (
ss(str, pos + 2, 1) != "E" ||
mm(ss(str, pos - 2, 6), []string{"BACHER", "MACHER"})) {
return "K", "K", 2
} else if 0 == pos && "CAESAR" == ss(str, pos, 6) {
return "S", "S", 2
} else if "CHIA" == ss(str, pos, 4) {
return "K", "K", 2
} else if "CH" == ss(str, pos, 2) {
if pos > 0 && "CHAE" == ss(str, pos, 4) {
return "K", "X", 2
} else if 0 == pos &&
(mm(ss(str, pos + 1, 5), []string{"HARAC", "HARIS"}) ||
mm(ss(str, pos + 1, 3), []string{"HOR", "HYM", "HIA", "HEM"})) &&
ss(str, 0, 5) != "CHORE" {
return "K", "K", 2
} else if mm(ss(str, 0, 4), []string{"VAN ", "VON "}) ||
"SCH" == ss(str, 0, 3) ||
mm(ss(str, pos - 2, 6), []string{"ORCHES", "ARCHIT", "ORCHID"}) ||
mm(ss(str, pos + 2, 1), []string{"T", "S"}) || (
(pos == 0 || mm(ss(str, pos - 1, 1), []string{"A", "O", "U", "E"})) &&
mm(ss(str, pos + 2, 1), []string{"L", "R", "N", "M", "B", "H", "F", "V", "W", " "})) {
return "K", "K", 2
} else if pos > 0 {
if "MC" == ss(str, 0, 2) {
return "K", "K", 2
} else {
return "X", "K", 2
}
} else {
return "X", "X", 2
}
} else if "CZ" == ss(str, pos, 2) && "WICZ" != ss(str, pos - 2, 4) {
return "S", "X", 2
} else if "CIA" == ss(str, pos + 1, 3) {
return "X", "X", 3
} else if "CC" == ss(str, pos, 2) && !(1 == pos && "M" == ss(str, 0, 1)) {
if mm(ss(str, pos + 2, 1), []string{"I", "E", "H"}) && "HU" != ss(str, pos + 2, 2) {
if (1 == pos && "A" == ss(str, pos - 1, 1)) ||
mm(ss(str, pos - 1, 5), []string{"UCCEE", "UCCES"}) {
return "KS", "KS", 3
} else {
return "X", "X", 3
}
} else {
return "K", "K", 2
}
} else if mm(ss(str, pos, 2), []string{"CK", "CG", "CQ"}) {
return "K", "K", 2
} else if mm(ss(str, pos, 2), []string{"CI", "CE", "CY"}) {
if mm(ss(str, pos, 3), []string{"CIO", "CIE", "CIA"}) {
return "S", "X", 2
} else {
return "S", "S", 2
}
} else if mm(ss(str, pos + 1, 2), []string{" C", " Q", "G"}) {
return "K", "K", 3
} else if mm(ss(str, pos + 1, 1), []string{"C", "K", "Q"}) && !mm(ss(str, pos + 1, 2), []string{"CE", "CI"}) {
return "K", "K", 2
} else {
return "K", "K", 1
}
case "D":
if "DG" == ss(str, pos, 2) {
if mm(ss(str, pos + 2, 1), []string{"I", "E", "Y"}) {
return "J", "J", 3
} else {
return "TK", "TK", 2
}
} else if mm(ss(str, pos, 2), []string{"DT", "DD"}) {
return "T", "T", 2
} else {
return "T", "T", 1
}
case "F":
if "F" == ss(str, pos + 1, 1) {
return "F", "F", 2
} else {
return "F", "F", 1
}
case "G":
if "H" == ss(str, pos + 1, 1) {
if pos > 0 && !vowel(ss(str, pos - 1, 1)) {
return "K", "K", 2
} else if 0 == pos {
if "I" == ss(str, pos + 2, 1) {
return "J", "J", 2
} else {
return "K", "K", 2
}
} else if (pos > 1 && mm(ss(str, pos - 2, 1), []string{"B", "H", "D"})) ||
(pos > 2 && mm(ss(str, pos - 3, 1), []string{"B", "H", "D"})) ||
(pos > 3 && mm(ss(str, pos - 4, 1), []string{"B", "H"})) {
return "", "", 2
} else if pos > 2 && "U" == ss(str, pos - 1, 1) && mm(ss(str, pos - 3, 1), []string{"C", "G", "L", "R", "T"}) {
return "F", "F", 2
} else if pos > 0 && "I" != ss(str, pos - 1, 1) {
return "K", "K", 2
} else {
return "", "", 2
}
} else if "N" == ss(str, pos + 1, 1) {
if 1 == pos && vowel(ss(str, 0, 1)) && !slavoGermanic(str) {
return "KN", "N", 2
} else if "EY" != ss(str, pos + 2, 2) && "Y" != ss(str, pos + 1, 1) && !slavoGermanic(str) {
return "N", "KN", 2
} else {
return "KN", "KN", 2
}
} else if "LI" == ss(str, pos + 1, 2) && !slavoGermanic(str) {
return "KL", "L", 2
} else if 0 == pos && ("Y" == ss(str, pos + 1, 1) ||
mm(ss(str, pos + 1, 2), []string{"ES", "EP", "EB", "EL", "EY", "EI", "ER", "IB", "IL", "IN", "IE"})) {
return "K", "J", 2
} else if ("ER" == ss(str, pos + 1, 2) || "Y" == ss(str, pos + 1, 1)) &&
!mm(ss(str, 0, 6), []string{"DANGER", "RANGER", "MANGER"}) &&
!mm(ss(str, pos - 1, 1), []string{"E", "I"}) &&
!mm(ss(str, pos - 1, 3), []string{"RGY", "OGY"}) {
return "K", "J", 2
} else if mm(ss(str, pos + 1, 1), []string{"E", "I", "Y"}) ||
mm(ss(str, pos - 1, 4), []string{"AGGI", "OGGI"}) {
if mm(ss(str, 0, 4), []string{"VAN ", "VON "}) || "SCH" == ss(str, 0, 3) || "ET" == ss(str, pos + 1, 2) {
return "K", "K", 2
} else if "IER " == ss(str, pos + 1, 4) {
return "J", "J", 2
} else {
return "J", "K", 2
}
} else if "G" == ss(str, pos + 1, 1) {
return "K", "K", 2
} else {
return "K", "K", 1
}
case "H":
if (0 == pos || vowel(ss(str, pos - 1, 1))) && vowel(ss(str, pos + 1, 1)) {
return "H", "H", 2
} else {
return "", "", 1
}
case "J":
if "JOSE" == ss(str, pos, 4) || "SAN " == ss(str, 0, 4) {
if (0 == pos && " " == ss(str, pos + 4, 1)) || "SAN " == ss(str, 0, 4) {
return "H", "H", 1
} else {
return "J", "H", 1
}
} else {
c := 1
if "J" == ss(str, pos + 1, 1) {
c = 2
}
if 0 == pos && "JOSE" != ss(str, pos, 4) {
return "J", "A", c
} else if vowel(ss(str, pos - 1, 1)) && !slavoGermanic(str) && mm(ss(str, pos + 1, 1), []string{"A", "O"}) {
return "J", "H", c
} else if pos == str.RuneCount() - 1 {
return "J", "", c
} else if !mm(ss(str, pos + 1, 1), []string{"L", "T", "K", "S", "N", "M", "B", "Z"}) &&
!mm(ss(str, pos - 1, 1), []string{"S", "K", "L"}) {
return "J", "J", c
} else {
return "", "", c
}
}
case "K":
c := 1
if "K" == ss(str, pos + 1, 1) {
c = 2
}
return "K", "K", c
case "L":
if "L" == ss(str, pos + 1, 1) {
if (str.RuneCount() - 3 == pos && mm(ss(str, pos - 1, 4), []string{"ILLO", "ILLA", "ALLE"})) ||
(mm(ss(str, str.RuneCount() - 2, 2), []string{"AS", "OS"}) || mm(ss(str, str.RuneCount() - 1, 1), []string{"A", "O"})) &&
"ALLE" == ss(str, pos - 1, 4) {
return "L", "", 2
} else {
return "L", "L", 2
}
} else {
return "L", "L", 1
}
case "M":
if ("UMB" == ss(str, pos - 1, 3) && (str.RuneCount() - 2 == pos || "ER" == ss(str, pos + 2, 2))) ||
"M" == ss(str, pos + 1, 1) {
return "M", "M", 2
} else {
return "M", "M", 1
}
case "N":
c := 1
if "N" == ss(str, pos + 1, 1) {
c = 2
}
return "N", "N", c
case "Ñ":
return "N", "N", 1
case "P":
if "H" == ss(str, pos + 1, 1) {
return "F", "F", 2
} else {
c := 1
if mm(ss(str, pos + 1, 1), []string{"P", "B"}) {
c = 2
}
return "P", "P", c
}
case "Q":
c := 1
if "Q" == ss(str, pos + 1, 1) {
c = 2
}
return "K", "K", c
case "R":
c := 1
if "R" == ss(str, pos + 1, 1) {
c = 2
}
if pos == str.RuneCount() - 1 && !slavoGermanic(str) && "IE" == ss(str, pos - 2, 2) &&
!mm(ss(str, pos - 4, 2), []string{"ME", "MA"}) {
return "", "R", c
} else {
return "R", "R", c
}
case "S":
if mm(ss(str, pos - 1, 3), []string{"ISL", "YSL"}) {
return "", "", 1
} else if 0 == pos && "SUGAR" == ss(str, 0, 5) {
return "X", "S", 1
} else if "H" == ss(str, pos + 1, 1) {
if mm(ss(str, pos + 1, 4), []string{"HEIM", "HOEK", "HOLM", "HOLZ"}) {
return "S", "S", 2
} else {
return "X", "X", 2
}
} else if mm(ss(str, pos, 3), []string{"SIO", "SIA"}) || "SIAN" == ss(str, pos, 4) {
if slavoGermanic(str) {
return "S", "S", 3
} else {
return "S", "X", 3
}
} else if 0 == pos && mm(ss(str, pos + 1, 1), []string{"M", "N", "L", "W"}) {
return "S", "X", 1
} else if "Z" == ss(str, pos + 1, 1) {
return "S", "X", 2
} else if "C" == ss(str, pos + 1, 1) {
if "H" == ss(str, pos + 2, 1) {
if mm(ss(str, pos + 3, 2), []string{"OO", "UY", "ED", "EM"}) {
return "SK", "SK", 3
} else if mm(ss(str, pos + 3, 2), []string{"ER", "EN"}) {
return "X", "SK", 3
}
} else if mm(ss(str, pos + 2, 1), []string{"I", "E", "Y"}) {
return "S", "S", 3
} else {
return "SK", "SK", 3
}
} else {
p := "S"
if pos == str.RuneCount() - 1 && mm(ss(str, pos - 2, 2), []string{"AI", "OI"}) {
p = ""
}
c := 1
if mm(ss(str, pos + 1, 1), []string{"S", "Z"}) {
c = 2
}
return p, "S", c
}
case "T":
if "TION" == ss(str, pos, 4) {
return "X", "X", 3
} else if mm(ss(str, pos, 3), []string{"TIA", "TCH"}) {
return "X", "X", 3
} else if "TH" == ss(str, pos, 2) || "TTH" == ss(str, pos, 3) {
if mm(ss(str, pos + 2, 2), []string{"OM", "AM"}) ||
mm(ss(str, 0, 4), []string{"VAN ", "VON "}) ||
"SCH" == ss(str, 0, 3) {
return "T", "T", 2
} else {
return "0", "T", 2
}
} else {
c := 1
if mm(ss(str, pos + 1, 1), []string{"T", "D"}) {
c = 2
}
return "T", "T", c
}
case "V":
c := 1
if "V" == ss(str, pos + 1, 1) {
c = 2
}
return "F", "F", c
case "W":
if "R" == ss(str, pos + 1, 1) {
return "R", "R", 2
}
p, s := "", ""
if 0 == pos && (vowel(ss(str, pos + 1, 1)) || "H" == ss(str, pos + 1, 1)) {
p = "A"
if vowel(ss(str, pos + 1, 1)) {
s = "F"
} else {
s = "A"
}
}
if (str.RuneCount() - 1 == pos && vowel(ss(str, pos - 1, 1))) ||
"SCH" == ss(str, 0, 3) ||
mm(ss(str, pos - 1, 5), []string{"EWSKI", "EWSKY", "OWSKI", "OWSKY"}) {
return p, s + "F", 1
} else if mm(ss(str, pos, 4), []string{"WICZ", "WITZ"}) {
return p + "TS", s + "FX", 4
} else {
return p, s, 1
}
case "X":
c := 1
if mm(ss(str, pos + 1, 1), []string{"C", "X"}) {
c = 2
}
if str.RuneCount() - 1 == pos && (mm(ss(str, pos - 3, 3), []string{"IAU", "EAU"}) ||
mm(ss(str, pos - 2, 2), []string{"AU", "OU"})) {
return "KS", "KS", c
} else {
return "", "", c
}
case "Z":
if "H" == ss(str, pos + 1, 1) {
return "J", "J", 2
} else {
c := 1
if "Z" == ss(str, pos + 1, 1) {
c = 2
}
if mm(ss(str, pos + 1, 2), []string{"ZO", "ZI", "ZA"}) || slavoGermanic(str) && (pos > 0 &&
"T" != ss(str, pos - 1, 1)) {
return "S", "TS", c
} else {
return "S", "S", c
}
}
}
return "", "", 1
}