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package tcellterm
func (vt *VT) esc(esc string) {
switch esc {
case "7":
vt.decsc()
case "8":
vt.decrc()
case "D":
vt.ind()
case "E":
vt.nel()
case "H":
vt.hts()
case "M":
vt.ri()
case "N":
vt.charsets.singleShift = true
vt.charsets.selected = g2
case "O":
vt.charsets.singleShift = true
vt.charsets.selected = g3
case "=":
// DECKPAM
case ">":
// DECKPNM
case "c":
vt.ris()
case "(0":
vt.charsets.designations[g0] = decSpecialAndLineDrawing
case ")0":
vt.charsets.designations[g1] = decSpecialAndLineDrawing
case "*0":
vt.charsets.designations[g2] = decSpecialAndLineDrawing
case "+0":
vt.charsets.designations[g3] = decSpecialAndLineDrawing
case "(B":
vt.charsets.designations[g0] = ascii
case ")B":
vt.charsets.designations[g1] = ascii
case "*B":
vt.charsets.designations[g2] = ascii
case "+B":
vt.charsets.designations[g3] = ascii
case "#8":
// DECALN
// Fill the screen with capital Es
// Not supported
}
}
// Index ESC-D
func (vt *VT) ind() {
vt.lastCol = false
if vt.cursor.row == vt.margin.bottom {
vt.scrollUp(1)
return
}
if vt.cursor.row >= row(vt.height()-1) {
// don't let row go beyond the height
return
}
vt.cursor.row += 1
}
// Next line ESC-E
// Moves cursor to the left margin of the next line, scrolling if necessary
func (vt *VT) nel() {
vt.ind()
vt.cursor.col = vt.margin.left
}
// Horizontal tab set ESC-H
func (vt *VT) hts() {
vt.tabStop = append(vt.tabStop, vt.cursor.col)
}
// Reverse Index ESC-M
func (vt *VT) ri() {
vt.lastCol = false
if vt.cursor.row < 0 {
return
}
if vt.cursor.row == vt.margin.top {
vt.scrollDown(1)
return
}
vt.cursor.row -= 1
}
// Save Cursor DECSC ESC-7
func (vt *VT) decsc() {
state := cursorState{
cursor: vt.cursor,
decawm: vt.mode&decawm != 0,
decom: vt.mode&decom != 0,
charsets: charsets{
selected: vt.charsets.selected,
saved: vt.charsets.saved,
designations: map[charsetDesignator]charset{
g0: vt.charsets.designations[g0],
g1: vt.charsets.designations[g1],
g2: vt.charsets.designations[g2],
g3: vt.charsets.designations[g3],
},
},
}
switch {
case vt.mode&smcup != 0:
// We are in alt screen
vt.altState = state
default:
vt.primaryState = state
}
}
// Restore Cursor DECRC ESC-8
func (vt *VT) decrc() {
var state cursorState
switch {
case vt.mode&smcup != 0:
// In the alt screen
state = vt.altState
default:
state = vt.primaryState
}
vt.cursor = state.cursor
vt.charsets = charsets{
selected: state.charsets.selected,
saved: state.charsets.saved,
designations: map[charsetDesignator]charset{
g0: state.charsets.designations[g0],
g1: state.charsets.designations[g1],
g2: state.charsets.designations[g2],
g3: state.charsets.designations[g3],
},
}
switch state.decawm {
case true:
vt.mode |= decawm
case false:
vt.mode &^= decawm
}
switch state.decom {
case true:
vt.mode |= decom
case false:
vt.mode &^= decom
}
}
// Reset Initial State (RIS) ESC-c
func (vt *VT) ris() {
w := vt.width()
h := vt.height()
vt.altScreen = make([][]cell, h)
vt.primaryScreen = make([][]cell, h)
for i := range vt.altScreen {
vt.altScreen[i] = make([]cell, w)
vt.primaryScreen[i] = make([]cell, w)
}
vt.margin.bottom = row(h) - 1
vt.margin.right = column(w) - 1
vt.cursor.row = 0
vt.cursor.col = 0
vt.lastCol = false
vt.activeScreen = vt.primaryScreen
vt.charsets = charsets{
selected: 0,
saved: 0,
designations: map[charsetDesignator]charset{
g0: ascii,
g1: ascii,
g2: ascii,
g3: ascii,
},
}
vt.mode = decawm | dectcem
vt.tabStop = []column{}
for i := 7; i < (50 * 7); i += 8 {
vt.tabStop = append(vt.tabStop, column(i))
}
}
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