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okurigana.go
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/
okurigana.go
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package wanakana
import (
"regexp"
"github.com/deelawn/wanakana/internal/character"
)
func isLeadingWithoutInitialKana(input string, leading bool) bool {
return leading && !IsKana(string([]rune(input)[0]))
}
func isTrailingWithoutFinalKana(input string, leading bool) bool {
runes := []rune(input)
return !leading && !IsKana(string(runes[len(runes)-1]))
}
func isValidMatcher(input string, matchKanji string) bool {
if matchKanji != "" {
for _, r := range []rune(matchKanji) {
if character.IsKanji(r) {
return true
}
}
return false
}
return !IsKana(input)
}
// StripOkurigana removes leading or trailing kana from a string.
func StripOkurigana(input string, leading bool, matchKanji string) string {
if !IsJapanese(input, nil) ||
isLeadingWithoutInitialKana(input, leading) ||
isTrailingWithoutFinalKana(input, leading) ||
!isValidMatcher(input, matchKanji) {
return input
}
modifiedInput := input
if matchKanji != "" {
modifiedInput = matchKanji
}
tokens := Tokenize(modifiedInput, false, false)
var removeToken Token
if leading {
removeToken = tokens[0]
} else {
removeToken = tokens[len(tokens)-1]
}
var result string
for _, token := range tokens {
result += token.Value
}
regexString := removeToken.Value + "$"
if leading {
regexString = "^" + removeToken.Value
}
regex, err := regexp.Compile(regexString)
if err != nil {
return input
}
return regex.ReplaceAllString(input, "")
}