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InputHandler.ts
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InputHandler.ts
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/**
* Copyright (c) 2014 The xterm.js authors. All rights reserved.
* Copyright (c) 2012-2013, Christopher Jeffrey (MIT License)
* @license MIT
*/
import { IInputHandler, IInputHandlingTerminal } from './Types';
import { C0, C1 } from 'common/data/EscapeSequences';
import { CHARSETS, DEFAULT_CHARSET } from 'common/data/Charsets';
import { wcwidth } from 'common/CharWidth';
import { EscapeSequenceParser } from 'common/parser/EscapeSequenceParser';
import { Disposable } from 'common/Lifecycle';
import { concat } from 'common/TypedArrayUtils';
import { StringToUtf32, stringFromCodePoint, utf32ToString, Utf8ToUtf32 } from 'common/input/TextDecoder';
import { DEFAULT_ATTR_DATA } from 'common/buffer/BufferLine';
import { EventEmitter, IEvent } from 'common/EventEmitter';
import { IParsingState, IDcsHandler, IEscapeSequenceParser, IParams, IFunctionIdentifier } from 'common/parser/Types';
import { NULL_CELL_CODE, NULL_CELL_WIDTH, Attributes, FgFlags, BgFlags, Content } from 'common/buffer/Constants';
import { CellData } from 'common/buffer/CellData';
import { AttributeData } from 'common/buffer/AttributeData';
import { IAttributeData, IDisposable } from 'common/Types';
import { ICoreService, IBufferService, IOptionsService, ILogService, IDirtyRowService, ICoreMouseService } from 'common/services/Services';
import { OscHandler } from 'common/parser/OscParser';
import { DcsHandler } from 'common/parser/DcsParser';
/**
* Map collect to glevel. Used in `selectCharset`.
*/
const GLEVEL: {[key: string]: number} = {'(': 0, ')': 1, '*': 2, '+': 3, '-': 1, '.': 2};
/**
* Max length of the UTF32 input buffer. Real memory consumption is 4 times higher.
*/
const MAX_PARSEBUFFER_LENGTH = 131072;
/**
* Limit length of title and icon name stacks.
*/
const STACK_LIMIT = 10;
/**
* DCS subparser implementations
*/
/**
* DCS $ q Pt ST
* DECRQSS (https://vt100.net/docs/vt510-rm/DECRQSS.html)
* Request Status String (DECRQSS), VT420 and up.
* Response: DECRPSS (https://vt100.net/docs/vt510-rm/DECRPSS.html)
*/
class DECRQSS implements IDcsHandler {
private _data: Uint32Array = new Uint32Array(0);
constructor(
private _bufferService: IBufferService,
private _coreService: ICoreService,
private _logService: ILogService,
private _optionsService: IOptionsService
) { }
hook(params: IParams): void {
this._data = new Uint32Array(0);
}
put(data: Uint32Array, start: number, end: number): void {
this._data = concat(this._data, data.subarray(start, end));
}
unhook(success: boolean): void {
if (!success) {
this._data = new Uint32Array(0);
return;
}
const data = utf32ToString(this._data);
this._data = new Uint32Array(0);
switch (data) {
// valid: DCS 1 $ r Pt ST (xterm)
case '"q': // DECSCA
return this._coreService.triggerDataEvent(`${C0.ESC}P1$r0"q${C0.ESC}\\`);
case '"p': // DECSCL
return this._coreService.triggerDataEvent(`${C0.ESC}P1$r61"p${C0.ESC}\\`);
case 'r': // DECSTBM
const pt = '' + (this._bufferService.buffer.scrollTop + 1) +
';' + (this._bufferService.buffer.scrollBottom + 1) + 'r';
return this._coreService.triggerDataEvent(`${C0.ESC}P1$r${pt}${C0.ESC}\\`);
case 'm': // SGR
// TODO: report real settings instead of 0m
return this._coreService.triggerDataEvent(`${C0.ESC}P1$r0m${C0.ESC}\\`);
case ' q': // DECSCUSR
const STYLES: {[key: string]: number} = {'block': 2, 'underline': 4, 'bar': 6};
let style = STYLES[this._optionsService.options.cursorStyle];
style -= this._optionsService.options.cursorBlink ? 1 : 0;
return this._coreService.triggerDataEvent(`${C0.ESC}P1$r${style} q${C0.ESC}\\`);
default:
// invalid: DCS 0 $ r Pt ST (xterm)
this._logService.debug('Unknown DCS $q %s', data);
this._coreService.triggerDataEvent(`${C0.ESC}P0$r${C0.ESC}\\`);
}
}
}
/**
* DCS Ps; Ps| Pt ST
* DECUDK (https://vt100.net/docs/vt510-rm/DECUDK.html)
* not supported
*/
/**
* DCS + q Pt ST (xterm)
* Request Terminfo String
* not implemented
*/
/**
* DCS + p Pt ST (xterm)
* Set Terminfo Data
* not supported
*/
/**
* The terminal's standard implementation of IInputHandler, this handles all
* input from the Parser.
*
* Refer to http://invisible-island.net/xterm/ctlseqs/ctlseqs.html to understand
* each function's header comment.
*/
export class InputHandler extends Disposable implements IInputHandler {
private _parseBuffer: Uint32Array = new Uint32Array(4096);
private _stringDecoder: StringToUtf32 = new StringToUtf32();
private _utf8Decoder: Utf8ToUtf32 = new Utf8ToUtf32();
private _workCell: CellData = new CellData();
private _windowTitle = '';
private _iconName = '';
private _windowTitleStack: string[] = [];
private _iconNameStack: string[] = [];
private _onCursorMove = new EventEmitter<void>();
public get onCursorMove(): IEvent<void> { return this._onCursorMove.event; }
private _onLineFeed = new EventEmitter<void>();
public get onLineFeed(): IEvent<void> { return this._onLineFeed.event; }
private _onScroll = new EventEmitter<number>();
public get onScroll(): IEvent<number> { return this._onScroll.event; }
constructor(
protected _terminal: IInputHandlingTerminal,
private readonly _bufferService: IBufferService,
private readonly _coreService: ICoreService,
private readonly _dirtyRowService: IDirtyRowService,
private readonly _logService: ILogService,
private readonly _optionsService: IOptionsService,
private readonly _coreMouseService: ICoreMouseService,
private readonly _parser: IEscapeSequenceParser = new EscapeSequenceParser())
{
super();
this.register(this._parser);
/**
* custom fallback handlers
*/
this._parser.setCsiHandlerFallback((ident, params) => {
this._logService.debug('Unknown CSI code: ', { identifier: this._parser.identToString(ident), params: params.toArray() });
});
this._parser.setEscHandlerFallback(ident => {
this._logService.debug('Unknown ESC code: ', { identifier: this._parser.identToString(ident) });
});
this._parser.setExecuteHandlerFallback(code => {
this._logService.debug('Unknown EXECUTE code: ', { code });
});
this._parser.setOscHandlerFallback((identifier, action, data) => {
this._logService.debug('Unknown OSC code: ', { identifier, action, data });
});
this._parser.setDcsHandlerFallback((ident, action, payload) => {
if (action === 'HOOK') {
payload = payload.toArray();
}
this._logService.debug('Unknown DCS code: ', { identifier: this._parser.identToString(ident), action, payload });
});
/**
* print handler
*/
this._parser.setPrintHandler((data, start, end) => this.print(data, start, end));
/**
* CSI handler
*/
this._parser.setCsiHandler({final: '@'}, params => this.insertChars(params));
this._parser.setCsiHandler({intermediates: ' ', final: '@'}, params => this.scrollLeft(params));
this._parser.setCsiHandler({final: 'A'}, params => this.cursorUp(params));
this._parser.setCsiHandler({intermediates: ' ', final: 'A'}, params => this.scrollRight(params));
this._parser.setCsiHandler({final: 'B'}, params => this.cursorDown(params));
this._parser.setCsiHandler({final: 'C'}, params => this.cursorForward(params));
this._parser.setCsiHandler({final: 'D'}, params => this.cursorBackward(params));
this._parser.setCsiHandler({final: 'E'}, params => this.cursorNextLine(params));
this._parser.setCsiHandler({final: 'F'}, params => this.cursorPrecedingLine(params));
this._parser.setCsiHandler({final: 'G'}, params => this.cursorCharAbsolute(params));
this._parser.setCsiHandler({final: 'H'}, params => this.cursorPosition(params));
this._parser.setCsiHandler({final: 'I'}, params => this.cursorForwardTab(params));
this._parser.setCsiHandler({final: 'J'}, params => this.eraseInDisplay(params));
this._parser.setCsiHandler({prefix: '?', final: 'J'}, params => this.eraseInDisplay(params));
this._parser.setCsiHandler({final: 'K'}, params => this.eraseInLine(params));
this._parser.setCsiHandler({prefix: '?', final: 'K'}, params => this.eraseInLine(params));
this._parser.setCsiHandler({final: 'L'}, params => this.insertLines(params));
this._parser.setCsiHandler({final: 'M'}, params => this.deleteLines(params));
this._parser.setCsiHandler({final: 'P'}, params => this.deleteChars(params));
this._parser.setCsiHandler({final: 'S'}, params => this.scrollUp(params));
this._parser.setCsiHandler({final: 'T'}, params => this.scrollDown(params));
this._parser.setCsiHandler({final: 'X'}, params => this.eraseChars(params));
this._parser.setCsiHandler({final: 'Z'}, params => this.cursorBackwardTab(params));
this._parser.setCsiHandler({final: '`'}, params => this.charPosAbsolute(params));
this._parser.setCsiHandler({final: 'a'}, params => this.hPositionRelative(params));
this._parser.setCsiHandler({final: 'b'}, params => this.repeatPrecedingCharacter(params));
this._parser.setCsiHandler({final: 'c'}, params => this.sendDeviceAttributesPrimary(params));
this._parser.setCsiHandler({prefix: '>', final: 'c'}, params => this.sendDeviceAttributesSecondary(params));
this._parser.setCsiHandler({final: 'd'}, params => this.linePosAbsolute(params));
this._parser.setCsiHandler({final: 'e'}, params => this.vPositionRelative(params));
this._parser.setCsiHandler({final: 'f'}, params => this.hVPosition(params));
this._parser.setCsiHandler({final: 'g'}, params => this.tabClear(params));
this._parser.setCsiHandler({final: 'h'}, params => this.setMode(params));
this._parser.setCsiHandler({prefix: '?', final: 'h'}, params => this.setModePrivate(params));
this._parser.setCsiHandler({final: 'l'}, params => this.resetMode(params));
this._parser.setCsiHandler({prefix: '?', final: 'l'}, params => this.resetModePrivate(params));
this._parser.setCsiHandler({final: 'm'}, params => this.charAttributes(params));
this._parser.setCsiHandler({final: 'n'}, params => this.deviceStatus(params));
this._parser.setCsiHandler({prefix: '?', final: 'n'}, params => this.deviceStatusPrivate(params));
this._parser.setCsiHandler({intermediates: '!', final: 'p'}, params => this.softReset(params));
this._parser.setCsiHandler({intermediates: ' ', final: 'q'}, params => this.setCursorStyle(params));
this._parser.setCsiHandler({final: 'r'}, params => this.setScrollRegion(params));
this._parser.setCsiHandler({final: 's'}, params => this.saveCursor(params));
this._parser.setCsiHandler({final: 't'}, params => this.windowOptions(params));
this._parser.setCsiHandler({final: 'u'}, params => this.restoreCursor(params));
this._parser.setCsiHandler({intermediates: '\'', final: '}'}, params => this.insertColumns(params));
this._parser.setCsiHandler({intermediates: '\'', final: '~'}, params => this.deleteColumns(params));
/**
* execute handler
*/
this._parser.setExecuteHandler(C0.BEL, () => this.bell());
this._parser.setExecuteHandler(C0.LF, () => this.lineFeed());
this._parser.setExecuteHandler(C0.VT, () => this.lineFeed());
this._parser.setExecuteHandler(C0.FF, () => this.lineFeed());
this._parser.setExecuteHandler(C0.CR, () => this.carriageReturn());
this._parser.setExecuteHandler(C0.BS, () => this.backspace());
this._parser.setExecuteHandler(C0.HT, () => this.tab());
this._parser.setExecuteHandler(C0.SO, () => this.shiftOut());
this._parser.setExecuteHandler(C0.SI, () => this.shiftIn());
// FIXME: What do to with missing? Old code just added those to print.
this._parser.setExecuteHandler(C1.IND, () => this.index());
this._parser.setExecuteHandler(C1.NEL, () => this.nextLine());
this._parser.setExecuteHandler(C1.HTS, () => this.tabSet());
/**
* OSC handler
*/
// 0 - icon name + title
this._parser.setOscHandler(0, new OscHandler((data: string) => { this.setTitle(data); this.setIconName(data); }));
// 1 - icon name
this._parser.setOscHandler(1, new OscHandler((data: string) => this.setIconName(data)));
// 2 - title
this._parser.setOscHandler(2, new OscHandler((data: string) => this.setTitle(data)));
// 3 - set property X in the form "prop=value"
// 4 - Change Color Number
// 5 - Change Special Color Number
// 6 - Enable/disable Special Color Number c
// 7 - current directory? (not in xterm spec, see https://gitlab.com/gnachman/iterm2/issues/3939)
// 10 - Change VT100 text foreground color to Pt.
// 11 - Change VT100 text background color to Pt.
// 12 - Change text cursor color to Pt.
// 13 - Change mouse foreground color to Pt.
// 14 - Change mouse background color to Pt.
// 15 - Change Tektronix foreground color to Pt.
// 16 - Change Tektronix background color to Pt.
// 17 - Change highlight background color to Pt.
// 18 - Change Tektronix cursor color to Pt.
// 19 - Change highlight foreground color to Pt.
// 46 - Change Log File to Pt.
// 50 - Set Font to Pt.
// 51 - reserved for Emacs shell.
// 52 - Manipulate Selection Data.
// 104 ; c - Reset Color Number c.
// 105 ; c - Reset Special Color Number c.
// 106 ; c; f - Enable/disable Special Color Number c.
// 110 - Reset VT100 text foreground color.
// 111 - Reset VT100 text background color.
// 112 - Reset text cursor color.
// 113 - Reset mouse foreground color.
// 114 - Reset mouse background color.
// 115 - Reset Tektronix foreground color.
// 116 - Reset Tektronix background color.
// 117 - Reset highlight color.
// 118 - Reset Tektronix cursor color.
// 119 - Reset highlight foreground color.
/**
* ESC handlers
*/
this._parser.setEscHandler({final: '7'}, () => this.saveCursor());
this._parser.setEscHandler({final: '8'}, () => this.restoreCursor());
this._parser.setEscHandler({final: 'D'}, () => this.index());
this._parser.setEscHandler({final: 'E'}, () => this.nextLine());
this._parser.setEscHandler({final: 'H'}, () => this.tabSet());
this._parser.setEscHandler({final: 'M'}, () => this.reverseIndex());
this._parser.setEscHandler({final: '='}, () => this.keypadApplicationMode());
this._parser.setEscHandler({final: '>'}, () => this.keypadNumericMode());
this._parser.setEscHandler({final: 'c'}, () => this.reset());
this._parser.setEscHandler({final: 'n'}, () => this.setgLevel(2));
this._parser.setEscHandler({final: 'o'}, () => this.setgLevel(3));
this._parser.setEscHandler({final: '|'}, () => this.setgLevel(3));
this._parser.setEscHandler({final: '}'}, () => this.setgLevel(2));
this._parser.setEscHandler({final: '~'}, () => this.setgLevel(1));
this._parser.setEscHandler({intermediates: '%', final: '@'}, () => this.selectDefaultCharset());
this._parser.setEscHandler({intermediates: '%', final: 'G'}, () => this.selectDefaultCharset());
for (const flag in CHARSETS) {
this._parser.setEscHandler({intermediates: '(', final: flag}, () => this.selectCharset('(' + flag));
this._parser.setEscHandler({intermediates: ')', final: flag}, () => this.selectCharset(')' + flag));
this._parser.setEscHandler({intermediates: '*', final: flag}, () => this.selectCharset('*' + flag));
this._parser.setEscHandler({intermediates: '+', final: flag}, () => this.selectCharset('+' + flag));
this._parser.setEscHandler({intermediates: '-', final: flag}, () => this.selectCharset('-' + flag));
this._parser.setEscHandler({intermediates: '.', final: flag}, () => this.selectCharset('.' + flag));
this._parser.setEscHandler({intermediates: '/', final: flag}, () => this.selectCharset('/' + flag)); // TODO: supported?
}
this._parser.setEscHandler({intermediates: '#', final: '8'}, () => this.screenAlignmentPattern());
/**
* error handler
*/
this._parser.setErrorHandler((state: IParsingState) => {
this._logService.error('Parsing error: ', state);
return state;
});
/**
* DCS handler
*/
this._parser.setDcsHandler({intermediates: '$', final: 'q'}, new DECRQSS(this._bufferService, this._coreService, this._logService, this._optionsService));
}
public dispose(): void {
super.dispose();
}
public parse(data: string | Uint8Array): void {
let buffer = this._bufferService.buffer;
const cursorStartX = buffer.x;
const cursorStartY = buffer.y;
this._logService.debug('parsing data', data);
// resize input buffer if needed
if (this._parseBuffer.length < data.length) {
if (this._parseBuffer.length < MAX_PARSEBUFFER_LENGTH) {
this._parseBuffer = new Uint32Array(Math.min(data.length, MAX_PARSEBUFFER_LENGTH));
}
}
// process big data in smaller chunks
if (data.length > MAX_PARSEBUFFER_LENGTH) {
for (let i = 0; i < data.length; i += MAX_PARSEBUFFER_LENGTH) {
const end = i + MAX_PARSEBUFFER_LENGTH < data.length ? i + MAX_PARSEBUFFER_LENGTH : data.length;
const len = (typeof data === 'string')
? this._stringDecoder.decode(data.substring(i, end), this._parseBuffer)
: this._utf8Decoder.decode(data.subarray(i, end), this._parseBuffer);
this._parser.parse(this._parseBuffer, len);
}
} else {
const len = (typeof data === 'string')
? this._stringDecoder.decode(data, this._parseBuffer)
: this._utf8Decoder.decode(data, this._parseBuffer);
this._parser.parse(this._parseBuffer, len);
}
buffer = this._bufferService.buffer;
if (buffer.x !== cursorStartX || buffer.y !== cursorStartY) {
this._onCursorMove.fire();
}
this._terminal.refresh(this._dirtyRowService.start, this._dirtyRowService.end);
}
public print(data: Uint32Array, start: number, end: number): void {
let code: number;
let chWidth: number;
const buffer = this._bufferService.buffer;
const charset = this._terminal.charset;
const screenReaderMode = this._optionsService.options.screenReaderMode;
const cols = this._bufferService.cols;
const wraparoundMode = this._terminal.wraparoundMode;
const insertMode = this._terminal.insertMode;
const curAttr = this._terminal.curAttrData;
let bufferRow = buffer.lines.get(buffer.y + buffer.ybase);
this._dirtyRowService.markDirty(buffer.y);
for (let pos = start; pos < end; ++pos) {
code = data[pos];
// calculate print space
// expensive call, therefore we save width in line buffer
chWidth = wcwidth(code);
// get charset replacement character
// charset is only defined for ASCII, therefore we only
// search for an replacement char if code < 127
if (code < 127 && charset) {
const ch = charset[String.fromCharCode(code)];
if (ch) {
code = ch.charCodeAt(0);
}
}
if (screenReaderMode) {
this._terminal.onA11yCharEmitter.fire(stringFromCodePoint(code));
}
// insert combining char at last cursor position
// FIXME: needs handling after cursor jumps
// buffer.x should never be 0 for a combining char
// since they always follow a cell consuming char
// therefore we can test for buffer.x to avoid overflow left
if (!chWidth && buffer.x) {
if (!bufferRow.getWidth(buffer.x - 1)) {
// found empty cell after fullwidth, need to go 2 cells back
// it is save to step 2 cells back here
// since an empty cell is only set by fullwidth chars
bufferRow.addCodepointToCell(buffer.x - 2, code);
} else {
bufferRow.addCodepointToCell(buffer.x - 1, code);
}
continue;
}
// goto next line if ch would overflow
// TODO: needs a global min terminal width of 2
// FIXME: additionally ensure chWidth fits into a line
// --> maybe forbid cols<xy at higher level as it would
// introduce a bad runtime penalty here
if (buffer.x + chWidth - 1 >= cols) {
// autowrap - DECAWM
// automatically wraps to the beginning of the next line
if (wraparoundMode) {
buffer.x = 0;
buffer.y++;
if (buffer.y === buffer.scrollBottom + 1) {
buffer.y--;
this._terminal.scroll(true);
} else {
if (buffer.y >= this._bufferService.rows) {
buffer.y = this._bufferService.rows - 1;
}
// The line already exists (eg. the initial viewport), mark it as a
// wrapped line
buffer.lines.get(buffer.y).isWrapped = true;
}
// row changed, get it again
bufferRow = buffer.lines.get(buffer.y + buffer.ybase);
} else {
buffer.x = cols - 1;
if (chWidth === 2) {
// FIXME: check for xterm behavior
// What to do here? We got a wide char that does not fit into last cell
continue;
}
}
}
// insert mode: move characters to right
if (insertMode) {
// right shift cells according to the width
bufferRow.insertCells(buffer.x, chWidth, buffer.getNullCell(curAttr));
// test last cell - since the last cell has only room for
// a halfwidth char any fullwidth shifted there is lost
// and will be set to empty cell
if (bufferRow.getWidth(cols - 1) === 2) {
bufferRow.setCellFromCodePoint(cols - 1, NULL_CELL_CODE, NULL_CELL_WIDTH, curAttr.fg, curAttr.bg);
}
}
// write current char to buffer and advance cursor
bufferRow.setCellFromCodePoint(buffer.x++, code, chWidth, curAttr.fg, curAttr.bg);
// fullwidth char - also set next cell to placeholder stub and advance cursor
// for graphemes bigger than fullwidth we can simply loop to zero
// we already made sure above, that buffer.x + chWidth will not overflow right
if (chWidth > 0) {
while (--chWidth) {
// other than a regular empty cell a cell following a wide char has no width
bufferRow.setCellFromCodePoint(buffer.x++, 0, 0, curAttr.fg, curAttr.bg);
}
}
}
// store last char in Parser.precedingCodepoint for REP to work correctly
// This needs to check whether:
// - fullwidth + surrogates: reset
// - combining: only base char gets carried on (bug in xterm?)
if (end) {
bufferRow.loadCell(buffer.x - 1, this._workCell);
if (this._workCell.getWidth() === 2 || this._workCell.getCode() > 0xFFFF) {
this._parser.precedingCodepoint = 0;
} else if (this._workCell.isCombined()) {
this._parser.precedingCodepoint = this._workCell.getChars().charCodeAt(0);
} else {
this._parser.precedingCodepoint = this._workCell.content;
}
}
this._dirtyRowService.markDirty(buffer.y);
}
/**
* Forward addCsiHandler from parser.
*/
public addCsiHandler(id: IFunctionIdentifier, callback: (params: IParams) => boolean): IDisposable {
if (id.final === 't' && !id.prefix && !id.intermediates) {
// security: always check whether window option is allowed
return this._parser.addCsiHandler(id, params => {
if (!~this._optionsService.options.allowedWindowOps.indexOf(params.params[0])) {
return true;
}
return callback(params);
});
}
return this._parser.addCsiHandler(id, callback);
}
/**
* Forward addDcsHandler from parser.
*/
public addDcsHandler(id: IFunctionIdentifier, callback: (data: string, param: IParams) => boolean): IDisposable {
return this._parser.addDcsHandler(id, new DcsHandler(callback));
}
/**
* Forward addEscHandler from parser.
*/
public addEscHandler(id: IFunctionIdentifier, callback: () => boolean): IDisposable {
return this._parser.addEscHandler(id, callback);
}
/**
* Forward addOscHandler from parser.
*/
public addOscHandler(ident: number, callback: (data: string) => boolean): IDisposable {
return this._parser.addOscHandler(ident, new OscHandler(callback));
}
/**
* BEL
* Bell (Ctrl-G).
*/
public bell(): void {
this._terminal.bell();
}
/**
* LF
* Line Feed or New Line (NL). (LF is Ctrl-J).
*/
public lineFeed(): void {
// make buffer local for faster access
const buffer = this._bufferService.buffer;
if (this._optionsService.options.convertEol) {
buffer.x = 0;
}
buffer.y++;
if (buffer.y === buffer.scrollBottom + 1) {
buffer.y--;
this._terminal.scroll();
} else if (buffer.y >= this._bufferService.rows) {
buffer.y = this._bufferService.rows - 1;
}
// If the end of the line is hit, prevent this action from wrapping around to the next line.
if (buffer.x >= this._bufferService.cols) {
buffer.x--;
}
this._onLineFeed.fire();
}
/**
* CR
* Carriage Return (Ctrl-M).
*/
public carriageReturn(): void {
this._bufferService.buffer.x = 0;
}
/**
* BS
* Backspace (Ctrl-H).
*/
public backspace(): void {
this._restrictCursor();
if (this._bufferService.buffer.x > 0) {
this._bufferService.buffer.x--;
}
}
/**
* TAB
* Horizontal Tab (HT) (Ctrl-I).
*/
public tab(): void {
if (this._bufferService.buffer.x >= this._bufferService.cols) {
return;
}
const originalX = this._bufferService.buffer.x;
this._bufferService.buffer.x = this._bufferService.buffer.nextStop();
if (this._optionsService.options.screenReaderMode) {
this._terminal.onA11yTabEmitter.fire(this._bufferService.buffer.x - originalX);
}
}
/**
* SO
* Shift Out (Ctrl-N) -> Switch to Alternate Character Set. This invokes the
* G1 character set.
*/
public shiftOut(): void {
this._terminal.setgLevel(1);
}
/**
* SI
* Shift In (Ctrl-O) -> Switch to Standard Character Set. This invokes the G0
* character set (the default).
*/
public shiftIn(): void {
this._terminal.setgLevel(0);
}
/**
* Restrict cursor to viewport size / scroll margin (origin mode).
*/
private _restrictCursor(): void {
this._bufferService.buffer.x = Math.min(this._bufferService.cols - 1, Math.max(0, this._bufferService.buffer.x));
this._bufferService.buffer.y = this._terminal.originMode
? Math.min(this._bufferService.buffer.scrollBottom, Math.max(this._bufferService.buffer.scrollTop, this._bufferService.buffer.y))
: Math.min(this._bufferService.rows - 1, Math.max(0, this._bufferService.buffer.y));
}
/**
* Set absolute cursor position.
*/
private _setCursor(x: number, y: number): void {
if (this._terminal.originMode) {
this._bufferService.buffer.x = x;
this._bufferService.buffer.y = this._bufferService.buffer.scrollTop + y;
} else {
this._bufferService.buffer.x = x;
this._bufferService.buffer.y = y;
}
this._restrictCursor();
}
/**
* Set relative cursor position.
*/
private _moveCursor(x: number, y: number): void {
// for relative changes we have to make sure we are within 0 .. cols/rows - 1
// before calculating the new position
this._restrictCursor();
this._setCursor(this._bufferService.buffer.x + x, this._bufferService.buffer.y + y);
}
/**
* CSI Ps A
* Cursor Up Ps Times (default = 1) (CUU).
*/
public cursorUp(params: IParams): void {
// stop at scrollTop
const diffToTop = this._bufferService.buffer.y - this._bufferService.buffer.scrollTop;
if (diffToTop >= 0) {
this._moveCursor(0, -Math.min(diffToTop, params.params[0] || 1));
} else {
this._moveCursor(0, -(params.params[0] || 1));
}
}
/**
* CSI Ps B
* Cursor Down Ps Times (default = 1) (CUD).
*/
public cursorDown(params: IParams): void {
// stop at scrollBottom
const diffToBottom = this._bufferService.buffer.scrollBottom - this._bufferService.buffer.y;
if (diffToBottom >= 0) {
this._moveCursor(0, Math.min(diffToBottom, params.params[0] || 1));
} else {
this._moveCursor(0, params.params[0] || 1);
}
}
/**
* CSI Ps C
* Cursor Forward Ps Times (default = 1) (CUF).
*/
public cursorForward(params: IParams): void {
this._moveCursor(params.params[0] || 1, 0);
}
/**
* CSI Ps D
* Cursor Backward Ps Times (default = 1) (CUB).
*/
public cursorBackward(params: IParams): void {
this._moveCursor(-(params.params[0] || 1), 0);
}
/**
* CSI Ps E
* Cursor Next Line Ps Times (default = 1) (CNL).
* Other than cursorDown (CUD) also set the cursor to first column.
*/
public cursorNextLine(params: IParams): void {
this.cursorDown(params);
this._bufferService.buffer.x = 0;
}
/**
* CSI Ps F
* Cursor Previous Line Ps Times (default = 1) (CPL).
* Other than cursorUp (CUU) also set the cursor to first column.
*/
public cursorPrecedingLine(params: IParams): void {
this.cursorUp(params);
this._bufferService.buffer.x = 0;
}
/**
* CSI Ps G
* Cursor Character Absolute [column] (default = [row,1]) (CHA).
*/
public cursorCharAbsolute(params: IParams): void {
this._setCursor((params.params[0] || 1) - 1, this._bufferService.buffer.y);
}
/**
* CSI Ps ; Ps H
* Cursor Position [row;column] (default = [1,1]) (CUP).
*/
public cursorPosition(params: IParams): void {
this._setCursor(
// col
(params.length >= 2) ? (params.params[1] || 1) - 1 : 0,
// row
(params.params[0] || 1) - 1);
}
/**
* CSI Pm ` Character Position Absolute
* [column] (default = [row,1]) (HPA).
* Currently same functionality as CHA.
*/
public charPosAbsolute(params: IParams): void {
this._setCursor((params.params[0] || 1) - 1, this._bufferService.buffer.y);
}
/**
* CSI Pm a Character Position Relative
* [columns] (default = [row,col+1]) (HPR)
* Currently same functionality as CUF.
*/
public hPositionRelative(params: IParams): void {
this._moveCursor(params.params[0] || 1, 0);
}
/**
* CSI Pm d Vertical Position Absolute (VPA)
* [row] (default = [1,column])
*/
public linePosAbsolute(params: IParams): void {
this._setCursor(this._bufferService.buffer.x, (params.params[0] || 1) - 1);
}
/**
* CSI Pm e Vertical Position Relative (VPR)
* [rows] (default = [row+1,column])
* reuse CSI Ps B ?
*/
public vPositionRelative(params: IParams): void {
this._moveCursor(0, params.params[0] || 1);
}
/**
* CSI Ps ; Ps f
* Horizontal and Vertical Position [row;column] (default =
* [1,1]) (HVP).
* Same as CUP.
*/
public hVPosition(params: IParams): void {
this.cursorPosition(params);
}
/**
* CSI Ps g Tab Clear (TBC).
* Ps = 0 -> Clear Current Column (default).
* Ps = 3 -> Clear All.
* Potentially:
* Ps = 2 -> Clear Stops on Line.
* http://vt100.net/annarbor/aaa-ug/section6.html
*/
public tabClear(params: IParams): void {
const param = params.params[0];
if (param === 0) {
delete this._bufferService.buffer.tabs[this._bufferService.buffer.x];
} else if (param === 3) {
this._bufferService.buffer.tabs = {};
}
}
/**
* CSI Ps I
* Cursor Forward Tabulation Ps tab stops (default = 1) (CHT).
*/
public cursorForwardTab(params: IParams): void {
if (this._bufferService.buffer.x >= this._bufferService.cols) {
return;
}
let param = params.params[0] || 1;
while (param--) {
this._bufferService.buffer.x = this._bufferService.buffer.nextStop();
}
}
/**
* CSI Ps Z Cursor Backward Tabulation Ps tab stops (default = 1) (CBT).
*/
public cursorBackwardTab(params: IParams): void {
if (this._bufferService.buffer.x >= this._bufferService.cols) {
return;
}
let param = params.params[0] || 1;
// make buffer local for faster access
const buffer = this._bufferService.buffer;
while (param--) {
buffer.x = buffer.prevStop();
}
}
/**
* Helper method to erase cells in a terminal row.
* The cell gets replaced with the eraseChar of the terminal.
* @param y row index
* @param start first cell index to be erased
* @param end end - 1 is last erased cell
*/
private _eraseInBufferLine(y: number, start: number, end: number, clearWrap: boolean = false): void {
const line = this._bufferService.buffer.lines.get(this._bufferService.buffer.ybase + y);
line.replaceCells(
start,
end,
this._bufferService.buffer.getNullCell(this._terminal.eraseAttrData())
);
if (clearWrap) {
line.isWrapped = false;
}
}
/**
* Helper method to reset cells in a terminal row.
* The cell gets replaced with the eraseChar of the terminal and the isWrapped property is set to false.
* @param y row index
*/
private _resetBufferLine(y: number): void {
const line = this._bufferService.buffer.lines.get(this._bufferService.buffer.ybase + y);
line.fill(this._bufferService.buffer.getNullCell(this._terminal.eraseAttrData()));
line.isWrapped = false;
}
/**
* CSI Ps J Erase in Display (ED).
* Ps = 0 -> Erase Below (default).
* Ps = 1 -> Erase Above.
* Ps = 2 -> Erase All.
* Ps = 3 -> Erase Saved Lines (xterm).
* CSI ? Ps J
* Erase in Display (DECSED).
* Ps = 0 -> Selective Erase Below (default).
* Ps = 1 -> Selective Erase Above.
* Ps = 2 -> Selective Erase All.
*/
public eraseInDisplay(params: IParams): void {
this._restrictCursor();
let j;
switch (params.params[0]) {
case 0:
j = this._bufferService.buffer.y;
this._dirtyRowService.markDirty(j);
this._eraseInBufferLine(j++, this._bufferService.buffer.x, this._bufferService.cols, this._bufferService.buffer.x === 0);
for (; j < this._bufferService.rows; j++) {
this._resetBufferLine(j);
}
this._dirtyRowService.markDirty(j);
break;
case 1:
j = this._bufferService.buffer.y;
this._dirtyRowService.markDirty(j);
// Deleted front part of line and everything before. This line will no longer be wrapped.
this._eraseInBufferLine(j, 0, this._bufferService.buffer.x + 1, true);
if (this._bufferService.buffer.x + 1 >= this._bufferService.cols) {
// Deleted entire previous line. This next line can no longer be wrapped.
this._bufferService.buffer.lines.get(j + 1).isWrapped = false;
}
while (j--) {
this._resetBufferLine(j);
}
this._dirtyRowService.markDirty(0);
break;
case 2:
j = this._bufferService.rows;
this._dirtyRowService.markDirty(j - 1);
while (j--) {
this._resetBufferLine(j);
}
this._dirtyRowService.markDirty(0);
break;
case 3:
// Clear scrollback (everything not in viewport)
const scrollBackSize = this._bufferService.buffer.lines.length - this._bufferService.rows;
if (scrollBackSize > 0) {
this._bufferService.buffer.lines.trimStart(scrollBackSize);
this._bufferService.buffer.ybase = Math.max(this._bufferService.buffer.ybase - scrollBackSize, 0);
this._bufferService.buffer.ydisp = Math.max(this._bufferService.buffer.ydisp - scrollBackSize, 0);
// Force a scroll event to refresh viewport
this._onScroll.fire(0);
}
break;
}
}
/**
* CSI Ps K Erase in Line (EL).
* Ps = 0 -> Erase to Right (default).
* Ps = 1 -> Erase to Left.
* Ps = 2 -> Erase All.
* CSI ? Ps K
* Erase in Line (DECSEL).
* Ps = 0 -> Selective Erase to Right (default).
* Ps = 1 -> Selective Erase to Left.
* Ps = 2 -> Selective Erase All.
*/
public eraseInLine(params: IParams): void {
this._restrictCursor();
switch (params.params[0]) {
case 0:
this._eraseInBufferLine(this._bufferService.buffer.y, this._bufferService.buffer.x, this._bufferService.cols);
break;
case 1:
this._eraseInBufferLine(this._bufferService.buffer.y, 0, this._bufferService.buffer.x + 1);
break;
case 2:
this._eraseInBufferLine(this._bufferService.buffer.y, 0, this._bufferService.cols);
break;
}
this._dirtyRowService.markDirty(this._bufferService.buffer.y);
}
/**
* CSI Ps L
* Insert Ps Line(s) (default = 1) (IL).
*/
public insertLines(params: IParams): void {
this._restrictCursor();
let param = params.params[0] || 1;
// make buffer local for faster access
const buffer = this._bufferService.buffer;
if (buffer.y > buffer.scrollBottom || buffer.y < buffer.scrollTop) {
return;
}
const row: number = buffer.y + buffer.ybase;
const scrollBottomRowsOffset = this._bufferService.rows - 1 - buffer.scrollBottom;
const scrollBottomAbsolute = this._bufferService.rows - 1 + buffer.ybase - scrollBottomRowsOffset + 1;
while (param--) {
// test: echo -e '\e[44m\e[1L\e[0m'
// blankLine(true) - xterm/linux behavior
buffer.lines.splice(scrollBottomAbsolute - 1, 1);
buffer.lines.splice(row, 0, buffer.getBlankLine(this._terminal.eraseAttrData()));
}
this._dirtyRowService.markRangeDirty(buffer.y, buffer.scrollBottom);
buffer.x = 0; // see https://vt100.net/docs/vt220-rm/chapter4.html - vt220 only?
}
/**
* CSI Ps M
* Delete Ps Line(s) (default = 1) (DL).
*/
public deleteLines(params: IParams): void {
this._restrictCursor();
let param = params.params[0] || 1;