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formula.go
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// Copyright 2013 ChaiShushan <chaishushan{AT}gmail.com>. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package plural
import (
"strings"
)
// Formula provides the language's standard plural formula.
func Formula(lang string) func(n int) int {
if idx := index(lang); idx != -1 {
return formulaTable[fmtForms(FormsTable[idx].Value)]
}
if idx := index("??"); idx != -1 {
return formulaTable[fmtForms(FormsTable[idx].Value)]
}
return func(n int) int {
return n
}
}
func index(lang string) int {
for i := 0; i < len(FormsTable); i++ {
if strings.HasPrefix(lang, FormsTable[i].Lang) {
return i
}
}
return -1
}
func fmtForms(forms string) string {
forms = strings.TrimSpace(forms)
forms = strings.Replace(forms, " ", "", -1)
return forms
}
var formulaTable = map[string]func(n int) int{
fmtForms("nplurals=n; plural=n-1;"): func(n int) int {
if n > 0 {
return n - 1
}
return 0
},
fmtForms("nplurals=1; plural=0;"): func(n int) int {
return 0
},
fmtForms("nplurals=2; plural=(n != 1);"): func(n int) int {
if n == 1 {
return 0
}
return 1
},
fmtForms("nplurals=2; plural=(n > 1);"): func(n int) int {
if n <= 1 {
return 0
}
return 1
},
fmtForms("nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n != 0 ? 1 : 2);"): func(n int) int {
if n%10 == 1 && n%100 != 11 {
return 0
}
if n != 0 {
return 1
}
return 2
},
fmtForms("nplurals=3; plural=n==1 ? 0 : n==2 ? 1 : 2;"): func(n int) int {
if n == 1 {
return 0
}
if n == 2 {
return 1
}
return 2
},
fmtForms("nplurals=3; plural=n==1 ? 0 : (n==0 || (n%100 > 0 && n%100 < 20)) ? 1 : 2;"): func(n int) int {
if n == 1 {
return 0
}
if n == 0 || (n%100 > 0 && n%100 < 20) {
return 1
}
return 2
},
fmtForms("nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && (n%100<10 || n%100>=20) ? 1 : 2);"): func(n int) int {
if n%10 == 1 && n%100 != 11 {
return 0
}
if n%10 >= 2 && (n%100 < 10 || n%100 >= 20) {
return 1
}
return 2
},
fmtForms("nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2);"): func(n int) int {
if n%10 == 1 && n%100 != 11 {
return 0
}
if n%10 >= 2 && n%10 <= 4 && (n%100 < 10 || n%100 >= 20) {
return 1
}
return 2
},
fmtForms("nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2);"): func(n int) int {
if n%10 == 1 && n%100 != 11 {
return 0
}
if n%10 >= 2 && n%10 <= 4 && (n%100 < 10 || n%100 >= 20) {
return 1
}
return 2
},
fmtForms("nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2);"): func(n int) int {
if n%10 == 1 && n%100 != 11 {
return 0
}
if n%10 >= 2 && n%10 <= 4 && (n%100 < 10 || n%100 >= 20) {
return 1
}
return 2
},
fmtForms("nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2);"): func(n int) int {
if n%10 == 1 && n%100 != 11 {
return 0
}
if n%10 >= 2 && n%10 <= 4 && (n%100 < 10 || n%100 >= 20) {
return 1
}
return 2
},
fmtForms("nplurals=3; plural=(n%10==1 && n%100!=11 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2);"): func(n int) int {
if n%10 == 1 && n%100 != 11 {
return 0
}
if n%10 >= 2 && n%10 <= 4 && (n%100 < 10 || n%100 >= 20) {
return 1
}
return 2
},
fmtForms("nplurals=3; plural=(n==1) ? 0 : (n>=2 && n<=4) ? 1 : 2;"): func(n int) int {
if n == 1 {
return 0
}
if n >= 2 && n <= 4 {
return 1
}
return 2
},
fmtForms("nplurals=3; plural=(n==1) ? 0 : (n>=2 && n<=4) ? 1 : 2;"): func(n int) int {
if n == 1 {
return 0
}
if n >= 2 && n <= 4 {
return 1
}
return 2
},
fmtForms("nplurals=3; plural=(n==1 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2);"): func(n int) int {
if n == 1 {
return 0
}
if n%10 >= 2 && n%10 <= 4 && (n%100 < 10 || n%100 >= 20) {
return 1
}
return 2
},
fmtForms("nplurals=4; plural=(n%100==1 ? 0 : n%100==2 ? 1 : n%100==3 || n%100==4 ? 2 : 3);"): func(n int) int {
if n%100 == 1 {
return 0
}
if n%100 == 2 {
return 1
}
if n%100 == 3 || n%100 == 4 {
return 2
}
return 3
},
}