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package util
// LuaRuneAt is a helper function for lua plugins to return the rune
// at an index within a string
func LuaRuneAt(str string, runeidx int) string {
i := 0
for len(str) > 0 {
r, _, size := DecodeCharacterInString(str)
str = str[size:]
if i == runeidx {
return string(r)
}
i++
}
return ""
}
// LuaGetLeadingWhitespace returns the leading whitespace of a string (used by lua plugins)
func LuaGetLeadingWhitespace(s string) string {
ws := []byte{}
for len(s) > 0 {
r, _, size := DecodeCharacterInString(s)
if r == ' ' || r == '\t' {
ws = append(ws, byte(r))
} else {
break
}
s = s[size:]
}
return string(ws)
}
// LuaIsWordChar returns true if the first rune in a string is a word character
func LuaIsWordChar(s string) bool {
r, _, _ := DecodeCharacterInString(s)
return IsWordChar(r)
}
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