gilo/editor/document/row.go
Timothy Warren cc99f08747
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Update to chapter 7 step 161 in kilo tutorial
2023-10-03 17:02:22 -04:00

188 lines
3.5 KiB
Go

package document
import (
"strings"
"timshome.page/gilo/editor/highlight"
"timshome.page/gilo/internal/gilo"
"timshome.page/gilo/key"
"unicode"
)
type Row struct {
parent *Document
chars []rune
render []rune
Hl []int
}
func newRow(parent *Document, s string) *Row {
var chars []rune
var render []rune
for _, ch := range s {
chars = append(chars, ch)
render = append(render, ch)
}
return &Row{parent, chars, render, []int{}}
}
func (r *Row) Size() int {
return len(r.chars)
}
// RenderSize is a convenient equivalent of row->rsize in kilo
func (r *Row) RenderSize() int {
return len(r.render)
}
func (r *Row) Render(at *gilo.Point) string {
return string(r.render[at.X:])
}
func (r *Row) Search(query string) int {
return strings.Index(string(r.render), query)
}
func (r *Row) insertRune(ch rune, at int) {
// If insertion index is invalid, just
// append the rune to the end of the array
if at < 0 || at >= r.Size() {
r.chars = append(r.chars, ch)
r.update()
return
}
var newSlice []rune
// Split the character array at the insertion point
start := r.chars[0:at]
end := r.chars[at:r.Size()]
// Splice it back together
newSlice = append(newSlice, start...)
newSlice = append(newSlice, ch)
newSlice = append(newSlice, end...)
r.chars = newSlice
r.update()
}
func (r *Row) appendString(str string) {
for _, ch := range str {
r.chars = append(r.chars, ch)
}
r.update()
}
func (r *Row) deleteRune(at int) {
if at < 0 || at >= r.Size() {
return
}
var newSlice []rune
// Split the character array at the insertion point
start := r.chars[0:at]
end := r.chars[at+1 : r.Size()] // Skip the index in question
// Splice it back together
newSlice = append(newSlice, start...)
newSlice = append(newSlice, end...)
r.chars = newSlice
r.update()
}
func (r *Row) update() {
r.render = r.render[:0]
replacement := strings.Repeat(" ", gilo.TabSize)
str := strings.ReplaceAll(string(r.chars), "\t", replacement)
for _, ch := range str {
r.render = append(r.render, ch)
}
r.updateSyntax()
}
// updateSyntax is the equivalent of editorUpdateSyntax in kilo
func (r *Row) updateSyntax() {
i := 0
s := r.parent.Syntax
prevSep := true
r.Hl = make([]int, r.RenderSize())
for x := range r.Hl {
r.Hl[x] = highlight.Normal
}
// Don't bother updating the syntax if there isn't any
if s == nil {
return
}
for i < r.RenderSize() {
ch := r.render[i]
prevHl := highlight.Normal
if i > 0 {
prevHl = r.Hl[i-1]
}
if s.Flags&highlight.HighlightNumbers == 1 {
if (unicode.IsDigit(ch) && (prevSep || prevHl == highlight.Number)) ||
(ch == '.' && prevHl == highlight.Number) {
r.Hl[i] = highlight.Number
i += 1
prevSep = false
continue
}
}
prevSep = key.IsSeparator(ch)
i++
}
}
func (r *Row) toString() string {
return string(r.chars)
}
// CursorXToRenderX is the equivalent of editorRowCxToRx in kilo
func (r *Row) CursorXToRenderX(cursorX int) (renderX int) {
renderX = 0
for i := 0; i < cursorX; i++ {
if r.chars[i] == '\t' {
renderX += (gilo.TabSize - 1) - (renderX % gilo.TabSize)
}
renderX += 1
}
return renderX
}
// RenderXtoCursorX is the equivalent of editorRowRxToCx in kilo
func (r *Row) RenderXtoCursorX(renderX int) (cursorX int) {
currentRenderX := 0
cursorX = 0
for cursorX = 0; cursorX < r.Size(); cursorX++ {
if r.chars[cursorX] == '\t' {
currentRenderX += (gilo.TabSize - 1) - (currentRenderX % gilo.TabSize)
} else {
currentRenderX += 1
}
if currentRenderX > renderX {
return cursorX
}
}
return cursorX
}