EndGame v3

sourcecode/gobalance/vendor/github.com/xrash/smetrics/soundex.go

@@ -0,0 +1,63 @@
+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 {
+	b := strings.Builder{}
+	b.Grow(4)
+
+	p := s[0]
+	if p <= 'z' && p >= 'a' {
+		p -= 32 // convert to uppercase
+	}
+	b.WriteByte(p)
+
+	n := 0
+	for i := 1; i < len(s); i++ {
+		c := s[i]
+
+		if c <= 'z' && c >= 'a' {
+			c -= 32 // convert to uppercase
+		} else if c < 'A' || c > 'Z' {
+			continue
+		}
+
+		if c == p {
+			continue
+		}
+
+		p = c
+
+		switch c {
+		case 'B', 'P', 'F', 'V':
+			c = '1'
+		case 'C', 'S', 'K', 'G', 'J', 'Q', 'X', 'Z':
+			c = '2'
+		case 'D', 'T':
+			c = '3'
+		case 'L':
+			c = '4'
+		case 'M', 'N':
+			c = '5'
+		case 'R':
+			c = '6'
+		default:
+			continue
+		}
+
+		b.WriteByte(c)
+		n++
+		if n == 3 {
+			break
+		}
+	}
+
+	for i := n; i < 3; i++ {
+		b.WriteByte('0')
+	}
+
+	return b.String()
+}