func (piece *RichText) EachCodepage(fn func(cpi codepage.CodepageIndex, text string, p *RichText)) {
piece.VisitAll(func(p *RichText) {
if p == nil {
panic("Whoa there!")
}
var lastIdx codepage.CodepageIndex = -1
start := 0
for i, r := range p.Text {
if lastIdx >= 0 {
if _, found := lastIdx.Codepage().CharForCodepoint(r); found {
continue
} else {
if i > start {
fn(lastIdx, p.Text[start:i], p)
start = i
}
lastIdx, _ = codepage.IndexForCodepoint(r)
}
} else {
if idx, found := codepage.IndexForCodepoint(r); found {
if i > start {
fn(lastIdx, p.Text[start:i], p)
start = i
}
lastIdx = idx
}
}
}
if start < len(p.Text) {
fn(lastIdx, p.Text[start:], p)
}
})
}
