mirror of https://github.com/vbatts/go-mtree.git
42 lines
839 B
Go
42 lines
839 B
Go
package smetrics
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import (
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"strings"
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)
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// 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.
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func Soundex(s string) string {
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m := map[byte]string{
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'B': "1", 'P': "1", 'F': "1", 'V': "1",
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'C': "2", 'S': "2", 'K': "2", 'G': "2", 'J': "2", 'Q': "2", 'X': "2", 'Z': "2",
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'D': "3", 'T': "3",
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'L': "4",
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'M': "5", 'N': "5",
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'R': "6",
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}
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s = strings.ToUpper(s)
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r := string(s[0])
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p := s[0]
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for i := 1; i < len(s) && len(r) < 4; i++ {
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c := s[i]
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if (c < 'A' || c > 'Z') || (c == p) {
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continue
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}
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p = c
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if n, ok := m[c]; ok {
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r += n
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}
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}
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for i := len(r); i < 4; i++ {
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r += "0"
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}
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return r
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}
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