65 lines
1.7 KiB
Go
65 lines
1.7 KiB
Go
package main
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import (
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"strconv"
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"strings"
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)
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var normMap map[rune]rune
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func init() {
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normMap = make(map[rune]rune)
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// (not only) european
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appendTransliterate(
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"ěřůøĉĝĥĵŝŭèùÿėįųāēīūļķņģőűëïąćęłńśźżõșțčďĺľňŕšťýžéíñóúüåäöçîşûğăâđêôơưáàãảạ",
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"eruocghjsueuyeiuaeiulkngoueiacelnszzostcdllnrstyzeinouuaaocisugaadeoouaaaaa",
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true,
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)
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// Vietnamese
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appendTransliterate(
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"áạàảãăắặằẳẵâấậầẩẫéẹèẻẽêếệềểễiíịìỉĩoóọòỏõôốộồổỗơớợờởỡúụùủũưứựừửữyýỵỳỷỹđ",
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"aaaaaaaaaaaaaaaaaeeeeeeeeeeeiiiiiioooooooooooooooooouuuuuuuuuuuyyyyyyd",
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true,
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)
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}
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func appendTransliterate(base, norm string, uppercase bool) {
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normRunes := []rune(norm)
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baseRunes := []rune(base)
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lenNorm := len(normRunes)
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lenBase := len(baseRunes)
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if lenNorm != lenBase {
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panic("Base and normalized strings have differend lenght: base=" + strconv.Itoa(lenBase) + ", norm=" + strconv.Itoa(lenNorm)) // programmer error in constant lenght
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}
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for i, baseRune := range baseRunes {
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normMap[baseRune] = normRunes[i]
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}
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if uppercase {
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upperBase := strings.ToUpper(base)
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upperNorm := strings.ToUpper(norm)
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normRune := []rune(upperNorm)
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for i, baseRune := range []rune(upperBase) {
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normMap[baseRune] = normRune[i]
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}
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}
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}
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// Remove diacritics and make lowercase.
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func removeDiacritics(baseString string) string {
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var normalizedRunes []rune
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for _, baseRune := range []rune(baseString) {
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if normRune, ok := normMap[baseRune]; ok {
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normalizedRunes = append(normalizedRunes, normRune)
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} else {
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normalizedRunes = append(normalizedRunes, baseRune)
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}
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}
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return string(normalizedRunes)
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}
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