gilo/editor/row.go

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package editor
import "strings"
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type row struct {
chars []rune
render []rune
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}
func newRow(s string) *row {
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var chars []rune
var render []rune
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for _, ch := range s {
chars = append(chars, ch)
render = append(render, ch)
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}
return &row {chars, render}
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}
func (r *row) size() int {
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return len(r.chars)
}
func (r *row) rSize() int {
return len(r.render)
}
func (r *row) update() {
r.render = r.render[:0]
replacement := strings.Repeat(" ", KiloTabStop)
str := strings.ReplaceAll(string(r.chars), "\t", replacement)
for _, ch := range str {
r.render = append(r.render, ch)
}
}
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func (r *row) cursorXToRenderX (cursorX int) int {
renderX := 0
i := 0
for ; i < cursorX; i++ {
if r.chars[i] == '\t' {
renderX += (KiloTabStop - 1) - (renderX % KiloTabStop)
}
renderX += 1
}
return renderX
}