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package vt
import (
uv "github.com/charmbracelet/ultraviolet"
"github.com/charmbracelet/x/ansi"
)
// handleControl handles a control character.
func (e *Emulator) handleControl(r byte) {
e.flushGrapheme() // Flush any pending grapheme before handling control codes.
if !e.handleCc(r) {
e.logf("unhandled sequence: ControlCode %q", r)
}
}
// linefeed is the same as [index], except that it respects [ansi.LNM] mode.
func (e *Emulator) linefeed() {
e.index()
if e.isModeSet(ansi.LineFeedNewLineMode) {
e.carriageReturn()
}
}
// index moves the cursor down one line, scrolling up if necessary. This
// always resets the phantom state i.e. pending wrap state.
func (e *Emulator) index() {
x, y := e.scr.CursorPosition()
scroll := e.scr.ScrollRegion()
// XXX: Handle scrollback whenever we add it.
if y == scroll.Max.Y-1 && x >= scroll.Min.X && x < scroll.Max.X {
e.scr.ScrollUp(1)
} else if y < scroll.Max.Y-1 || !uv.Pos(x, y).In(scroll) {
e.scr.moveCursor(0, 1)
}
e.atPhantom = false
}
// horizontalTabSet sets a horizontal tab stop at the current cursor position.
func (e *Emulator) horizontalTabSet() {
x, _ := e.scr.CursorPosition()
e.tabstops.Set(x)
}
// reverseIndex moves the cursor up one line, or scrolling down. This does not
// reset the phantom state i.e. pending wrap state.
func (e *Emulator) reverseIndex() {
x, y := e.scr.CursorPosition()
scroll := e.scr.ScrollRegion()
if y == scroll.Min.Y && x >= scroll.Min.X && x < scroll.Max.X {
e.scr.ScrollDown(1)
} else {
e.scr.moveCursor(0, -1)
}
}
// backspace moves the cursor back one cell, if possible.
func (e *Emulator) backspace() {
// This acts like [ansi.CUB]
e.moveCursor(-1, 0)
}
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