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package vaxis
import (
"strings"
"github.com/mattn/go-runewidth"
"github.com/rivo/uniseg"
)
type graphemeWidthMethod int
const (
wcwidth graphemeWidthMethod = iota
noZWJ // we do unicodeStd but not if there is a ZWJ
unicodeStd
)
func gwidth(s string, method graphemeWidthMethod) int {
switch method {
case noZWJ:
s = strings.ReplaceAll(s, "\u200D", "")
return uniseg.StringWidth(s)
case unicodeStd:
return uniseg.StringWidth(s)
default:
total := 0
for _, r := range s {
if r >= 0xFE00 && r <= 0xFE0F {
// Variation Selectors 1 - 16
continue
}
if r >= 0xE0100 && r <= 0xE01EF {
// Variation Selectors 17-256
continue
}
total += runewidth.RuneWidth(r)
}
return total
}
}
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