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node/lib/readline.js

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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
// Inspiration for this code comes from Salvatore Sanfilippo's linenoise.
// https://github.com/antirez/linenoise
// Reference:
// * http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
// * http://www.3waylabs.com/nw/WWW/products/wizcon/vt220.html
var kHistorySize = 30;
var util = require('util');
var inherits = require('util').inherits;
var EventEmitter = require('events').EventEmitter;
exports.createInterface = function(input, output, completer, terminal) {
var rl;
if (arguments.length === 1) {
rl = new Interface(input);
} else {
rl = new Interface(input, output, completer, terminal);
}
return rl;
};
function Interface(input, output, completer, terminal) {
if (!(this instanceof Interface)) {
return new Interface(input, output, completer, terminal);
}
this._sawReturn = false;
EventEmitter.call(this);
if (arguments.length === 1) {
// an options object was given
output = input.output;
completer = input.completer;
terminal = input.terminal;
input = input.input;
}
completer = completer || function() { return []; };
if (!util.isFunction(completer)) {
throw new TypeError('Argument \'completer\' must be a function');
}
// backwards compat; check the isTTY prop of the output stream
// when `terminal` was not specified
if (util.isUndefined(terminal)) {
terminal = !!output.isTTY;
}
var self = this;
this.output = output;
this.input = input;
// Check arity, 2 - for async, 1 for sync
this.completer = completer.length === 2 ? completer : function(v, callback) {
callback(null, completer(v));
};
this.setPrompt('> ');
this.terminal = !!terminal;
function ondata(data) {
self._normalWrite(data);
}
function onend() {
if (util.isString(self._line_buffer) && self._line_buffer.length > 0) {
self.emit('line', self._line_buffer);
}
self.close();
}
function ontermend() {
if (util.isString(self.line) && self.line.length > 0) {
self.emit('line', self.line);
}
self.close();
}
function onkeypress(s, key) {
self._ttyWrite(s, key);
}
function onresize() {
self._refreshLine();
}
if (!this.terminal) {
input.on('data', ondata);
input.on('end', onend);
self.once('close', function() {
input.removeListener('data', ondata);
input.removeListener('end', onend);
});
var StringDecoder = require('string_decoder').StringDecoder; // lazy load
this._decoder = new StringDecoder('utf8');
} else {
exports.emitKeypressEvents(input);
// input usually refers to stdin
input.on('keypress', onkeypress);
input.on('end', ontermend);
// Current line
this.line = '';
this._setRawMode(true);
this.terminal = true;
// Cursor position on the line.
this.cursor = 0;
this.history = [];
this.historyIndex = -1;
output.on('resize', onresize);
self.once('close', function() {
input.removeListener('keypress', onkeypress);
input.removeListener('end', ontermend);
output.removeListener('resize', onresize);
});
}
input.resume();
}
inherits(Interface, EventEmitter);
Interface.prototype.__defineGetter__('columns', function() {
return this.output.columns || Infinity;
});
Interface.prototype.setPrompt = function(prompt) {
this._prompt = prompt;
};
Interface.prototype._setRawMode = function(mode) {
if (util.isFunction(this.input.setRawMode)) {
return this.input.setRawMode(mode);
}
};
Interface.prototype.prompt = function(preserveCursor) {
if (this.paused) this.resume();
if (this.terminal) {
if (!preserveCursor) this.cursor = 0;
this._refreshLine();
} else {
this.output.write(this._prompt);
}
};
Interface.prototype.question = function(query, cb) {
if (util.isFunction(cb)) {
if (this._questionCallback) {
this.prompt();
} else {
this._oldPrompt = this._prompt;
this.setPrompt(query);
this._questionCallback = cb;
this.prompt();
}
}
};
Interface.prototype._onLine = function(line) {
if (this._questionCallback) {
var cb = this._questionCallback;
this._questionCallback = null;
this.setPrompt(this._oldPrompt);
cb(line);
} else {
this.emit('line', line);
}
};
Interface.prototype._addHistory = function() {
if (this.line.length === 0) return '';
if (this.history.length === 0 || this.history[0] !== this.line) {
this.history.unshift(this.line);
// Only store so many
if (this.history.length > kHistorySize) this.history.pop();
}
this.historyIndex = -1;
return this.history[0];
};
Interface.prototype._refreshLine = function() {
// line length
var line = this._prompt + this.line;
var dispPos = this._getDisplayPos(line);
var lineCols = dispPos.cols;
var lineRows = dispPos.rows;
// cursor position
var cursorPos = this._getCursorPos();
// first move to the bottom of the current line, based on cursor pos
var prevRows = this.prevRows || 0;
if (prevRows > 0) {
exports.moveCursor(this.output, 0, -prevRows);
}
// Cursor to left edge.
exports.cursorTo(this.output, 0);
// erase data
exports.clearScreenDown(this.output);
// Write the prompt and the current buffer content.
this.output.write(line);
// Force terminal to allocate a new line
if (lineCols === 0) {
this.output.write(' ');
}
// Move cursor to original position.
exports.cursorTo(this.output, cursorPos.cols);
var diff = lineRows - cursorPos.rows;
if (diff > 0) {
exports.moveCursor(this.output, 0, -diff);
}
this.prevRows = cursorPos.rows;
};
Interface.prototype.close = function() {
if (this.closed) return;
this.pause();
if (this.terminal) {
this._setRawMode(false);
}
this.closed = true;
this.emit('close');
};
Interface.prototype.pause = function() {
if (this.paused) return;
this.input.pause();
this.paused = true;
this.emit('pause');
return this;
};
Interface.prototype.resume = function() {
if (!this.paused) return;
this.input.resume();
this.paused = false;
this.emit('resume');
return this;
};
Interface.prototype.write = function(d, key) {
if (this.paused) this.resume();
this.terminal ? this._ttyWrite(d, key) : this._normalWrite(d);
};
// \r\n, \n, or \r followed by something other than \n
var lineEnding = /\r?\n|\r(?!\n)/;
Interface.prototype._normalWrite = function(b) {
if (util.isUndefined(b)) {
return;
}
var string = this._decoder.write(b);
if (this._sawReturn) {
string = string.replace(/^\n/, '');
this._sawReturn = false;
}
if (this._line_buffer) {
string = this._line_buffer + string;
this._line_buffer = null;
}
if (lineEnding.test(string)) {
this._sawReturn = /\r$/.test(string);
// got one or more newlines; process into "line" events
var lines = string.split(lineEnding);
// either '' or (concievably) the unfinished portion of the next line
string = lines.pop();
this._line_buffer = string;
lines.forEach(function(line) {
this._onLine(line);
}, this);
} else if (string) {
// no newlines this time, save what we have for next time
this._line_buffer = string;
}
};
Interface.prototype._insertString = function(c) {
//BUG: Problem when adding tabs with following content.
// Perhaps the bug is in _refreshLine(). Not sure.
// A hack would be to insert spaces instead of literal '\t'.
if (this.cursor < this.line.length) {
var beg = this.line.slice(0, this.cursor);
var end = this.line.slice(this.cursor, this.line.length);
this.line = beg + c + end;
this.cursor += c.length;
this._refreshLine();
} else {
this.line += c;
this.cursor += c.length;
if (this._getCursorPos().cols === 0) {
this._refreshLine();
} else {
this.output.write(c);
}
// a hack to get the line refreshed if it's needed
this._moveCursor(0);
}
};
Interface.prototype._tabComplete = function() {
var self = this;
self.pause();
self.completer(self.line.slice(0, self.cursor), function(err, rv) {
self.resume();
if (err) {
// XXX Log it somewhere?
return;
}
var completions = rv[0],
completeOn = rv[1]; // the text that was completed
if (completions && completions.length) {
// Apply/show completions.
if (completions.length === 1) {
self._insertString(completions[0].slice(completeOn.length));
} else {
self.output.write('\r\n');
var width = completions.reduce(function(a, b) {
return a.length > b.length ? a : b;
}).length + 2; // 2 space padding
var maxColumns = Math.floor(self.columns / width) || 1;
var group = [], c;
for (var i = 0, compLen = completions.length; i < compLen; i++) {
c = completions[i];
if (c === '') {
handleGroup(self, group, width, maxColumns);
group = [];
} else {
group.push(c);
}
}
handleGroup(self, group, width, maxColumns);
// If there is a common prefix to all matches, then apply that
// portion.
var f = completions.filter(function(e) { if (e) return e; });
var prefix = commonPrefix(f);
if (prefix.length > completeOn.length) {
self._insertString(prefix.slice(completeOn.length));
}
}
self._refreshLine();
}
});
};
// this = Interface instance
function handleGroup(self, group, width, maxColumns) {
if (group.length == 0) {
return;
}
var minRows = Math.ceil(group.length / maxColumns);
for (var row = 0; row < minRows; row++) {
for (var col = 0; col < maxColumns; col++) {
var idx = row * maxColumns + col;
if (idx >= group.length) {
break;
}
var item = group[idx];
self.output.write(item);
if (col < maxColumns - 1) {
for (var s = 0, itemLen = item.length; s < width - itemLen;
s++) {
self.output.write(' ');
}
}
}
self.output.write('\r\n');
}
self.output.write('\r\n');
}
function commonPrefix(strings) {
if (!strings || strings.length == 0) {
return '';
}
var sorted = strings.slice().sort();
var min = sorted[0];
var max = sorted[sorted.length - 1];
for (var i = 0, len = min.length; i < len; i++) {
if (min[i] != max[i]) {
return min.slice(0, i);
}
}
return min;
}
Interface.prototype._wordLeft = function() {
if (this.cursor > 0) {
var leading = this.line.slice(0, this.cursor);
var match = leading.match(/([^\w\s]+|\w+|)\s*$/);
this._moveCursor(-match[0].length);
}
};
Interface.prototype._wordRight = function() {
if (this.cursor < this.line.length) {
var trailing = this.line.slice(this.cursor);
var match = trailing.match(/^(\s+|\W+|\w+)\s*/);
this._moveCursor(match[0].length);
}
};
Interface.prototype._deleteLeft = function() {
if (this.cursor > 0 && this.line.length > 0) {
this.line = this.line.slice(0, this.cursor - 1) +
this.line.slice(this.cursor, this.line.length);
this.cursor--;
this._refreshLine();
}
};
Interface.prototype._deleteRight = function() {
this.line = this.line.slice(0, this.cursor) +
this.line.slice(this.cursor + 1, this.line.length);
this._refreshLine();
};
Interface.prototype._deleteWordLeft = function() {
if (this.cursor > 0) {
var leading = this.line.slice(0, this.cursor);
var match = leading.match(/([^\w\s]+|\w+|)\s*$/);
leading = leading.slice(0, leading.length - match[0].length);
this.line = leading + this.line.slice(this.cursor, this.line.length);
this.cursor = leading.length;
this._refreshLine();
}
};
Interface.prototype._deleteWordRight = function() {
if (this.cursor < this.line.length) {
var trailing = this.line.slice(this.cursor);
var match = trailing.match(/^(\s+|\W+|\w+)\s*/);
this.line = this.line.slice(0, this.cursor) +
trailing.slice(match[0].length);
this._refreshLine();
}
};
Interface.prototype._deleteLineLeft = function() {
this.line = this.line.slice(this.cursor);
this.cursor = 0;
this._refreshLine();
};
Interface.prototype._deleteLineRight = function() {
this.line = this.line.slice(0, this.cursor);
this._refreshLine();
};
Interface.prototype.clearLine = function() {
this._moveCursor(+Infinity);
this.output.write('\r\n');
this.line = '';
this.cursor = 0;
this.prevRows = 0;
};
Interface.prototype._line = function() {
var line = this._addHistory();
this.clearLine();
this._onLine(line);
};
Interface.prototype._historyNext = function() {
if (this.historyIndex > 0) {
this.historyIndex--;
this.line = this.history[this.historyIndex];
this.cursor = this.line.length; // set cursor to end of line.
this._refreshLine();
} else if (this.historyIndex === 0) {
this.historyIndex = -1;
this.cursor = 0;
this.line = '';
this._refreshLine();
}
};
Interface.prototype._historyPrev = function() {
if (this.historyIndex + 1 < this.history.length) {
this.historyIndex++;
this.line = this.history[this.historyIndex];
this.cursor = this.line.length; // set cursor to end of line.
this._refreshLine();
}
};
// Returns the last character's display position of the given string
Interface.prototype._getDisplayPos = function(str) {
var offset = 0;
var col = this.columns;
var row = 0;
var code;
str = stripVTControlCharacters(str);
for (var i = 0, len = str.length; i < len; i++) {
code = codePointAt(str, i);
if (code >= 0x10000) { // surrogates
i++;
}
if (code === 0x0a) { // new line \n
offset = 0;
row += 1;
continue;
}
if (isFullWidthCodePoint(code)) {
if ((offset + 1) % col === 0) {
offset++;
}
offset += 2;
} else {
offset++;
}
}
var cols = offset % col;
var rows = row + (offset - cols) / col;
return {cols: cols, rows: rows};
};
// Returns current cursor's position and line
Interface.prototype._getCursorPos = function() {
var columns = this.columns;
var strBeforeCursor = this._prompt + this.line.substring(0, this.cursor);
var dispPos = this._getDisplayPos(stripVTControlCharacters(strBeforeCursor));
var cols = dispPos.cols;
var rows = dispPos.rows;
// If the cursor is on a full-width character which steps over the line,
// move the cursor to the beginning of the next line.
if (cols + 1 === columns &&
this.cursor < this.line.length &&
isFullWidthCodePoint(codePointAt(this.line, this.cursor))) {
rows++;
cols = 0;
}
return {cols: cols, rows: rows};
};
// This function moves cursor dx places to the right
// (-dx for left) and refreshes the line if it is needed
Interface.prototype._moveCursor = function(dx) {
var oldcursor = this.cursor;
var oldPos = this._getCursorPos();
this.cursor += dx;
// bounds check
if (this.cursor < 0) this.cursor = 0;
else if (this.cursor > this.line.length) this.cursor = this.line.length;
var newPos = this._getCursorPos();
// check if cursors are in the same line
if (oldPos.rows === newPos.rows) {
var diffCursor = this.cursor - oldcursor;
var diffWidth;
if (diffCursor < 0) {
diffWidth = -getStringWidth(
this.line.substring(this.cursor, oldcursor)
);
} else if (diffCursor > 0) {
diffWidth = getStringWidth(
this.line.substring(this.cursor, oldcursor)
);
}
exports.moveCursor(this.output, diffWidth, 0);
this.prevRows = newPos.rows;
} else {
this._refreshLine();
}
};
// handle a write from the tty
Interface.prototype._ttyWrite = function(s, key) {
key = key || {};
// Ignore escape key - Fixes #2876
if (key.name == 'escape') return;
if (key.ctrl && key.shift) {
/* Control and shift pressed */
switch (key.name) {
case 'backspace':
this._deleteLineLeft();
break;
case 'delete':
this._deleteLineRight();
break;
}
} else if (key.ctrl) {
/* Control key pressed */
switch (key.name) {
case 'c':
if (EventEmitter.listenerCount(this, 'SIGINT') > 0) {
this.emit('SIGINT');
} else {
// This readline instance is finished
this.close();
}
break;
case 'h': // delete left
this._deleteLeft();
break;
case 'd': // delete right or EOF
if (this.cursor === 0 && this.line.length === 0) {
// This readline instance is finished
this.close();
} else if (this.cursor < this.line.length) {
this._deleteRight();
}
break;
case 'u': // delete the whole line
this.cursor = 0;
this.line = '';
this._refreshLine();
break;
case 'k': // delete from current to end of line
this._deleteLineRight();
break;
case 'a': // go to the start of the line
this._moveCursor(-Infinity);
break;
case 'e': // go to the end of the line
this._moveCursor(+Infinity);
break;
case 'b': // back one character
this._moveCursor(-1);
break;
case 'f': // forward one character
this._moveCursor(+1);
break;
case 'l': // clear the whole screen
exports.cursorTo(this.output, 0, 0);
exports.clearScreenDown(this.output);
this._refreshLine();
break;
case 'n': // next history item
this._historyNext();
break;
case 'p': // previous history item
this._historyPrev();
break;
case 'z':
if (process.platform == 'win32') break;
if (EventEmitter.listenerCount(this, 'SIGTSTP') > 0) {
this.emit('SIGTSTP');
} else {
process.once('SIGCONT', (function(self) {
return function() {
// Don't raise events if stream has already been abandoned.
if (!self.paused) {
// Stream must be paused and resumed after SIGCONT to catch
// SIGINT, SIGTSTP, and EOF.
self.pause();
self.emit('SIGCONT');
}
// explicitly re-enable "raw mode" and move the cursor to
// the correct position.
// See https://github.com/joyent/node/issues/3295.
self._setRawMode(true);
self._refreshLine();
};
})(this));
this._setRawMode(false);
process.kill(process.pid, 'SIGTSTP');
}
break;
case 'w': // delete backwards to a word boundary
case 'backspace':
this._deleteWordLeft();
break;
case 'delete': // delete forward to a word boundary
this._deleteWordRight();
break;
case 'backspace':
this._deleteWordLeft();
break;
case 'left':
this._wordLeft();
break;
case 'right':
this._wordRight();
break;
}
} else if (key.meta) {
/* Meta key pressed */
switch (key.name) {
case 'b': // backward word
this._wordLeft();
break;
case 'f': // forward word
this._wordRight();
break;
case 'd': // delete forward word
case 'delete':
this._deleteWordRight();
break;
case 'backspace': // delete backwards to a word boundary
this._deleteWordLeft();
break;
}
} else {
/* No modifier keys used */
// \r bookkeeping is only relevant if a \n comes right after.
if (this._sawReturn && key.name !== 'enter')
this._sawReturn = false;
switch (key.name) {
case 'return': // carriage return, i.e. \r
this._sawReturn = true;
this._line();
break;
case 'enter':
if (this._sawReturn)
this._sawReturn = false;
else
this._line();
break;
case 'backspace':
this._deleteLeft();
break;
case 'delete':
this._deleteRight();
break;
case 'tab': // tab completion
this._tabComplete();
break;
case 'left':
this._moveCursor(-1);
break;
case 'right':
this._moveCursor(+1);
break;
case 'home':
this._moveCursor(-Infinity);
break;
case 'end':
this._moveCursor(+Infinity);
break;
case 'up':
this._historyPrev();
break;
case 'down':
this._historyNext();
break;
default:
if (util.isBuffer(s))
s = s.toString('utf-8');
if (s) {
var lines = s.split(/\r\n|\n|\r/);
for (var i = 0, len = lines.length; i < len; i++) {
if (i > 0) {
this._line();
}
this._insertString(lines[i]);
}
}
}
}
};
exports.Interface = Interface;
/**
* accepts a readable Stream instance and makes it emit "keypress" events
*/
function emitKeypressEvents(stream) {
if (stream._keypressDecoder) return;
var StringDecoder = require('string_decoder').StringDecoder; // lazy load
stream._keypressDecoder = new StringDecoder('utf8');
function onData(b) {
if (EventEmitter.listenerCount(stream, 'keypress') > 0) {
var r = stream._keypressDecoder.write(b);
if (r) emitKeys(stream, r);
} else {
// Nobody's watching anyway
stream.removeListener('data', onData);
stream.on('newListener', onNewListener);
}
}
function onNewListener(event) {
if (event == 'keypress') {
stream.on('data', onData);
stream.removeListener('newListener', onNewListener);
}
}
if (EventEmitter.listenerCount(stream, 'keypress') > 0) {
stream.on('data', onData);
} else {
stream.on('newListener', onNewListener);
}
}
exports.emitKeypressEvents = emitKeypressEvents;
/*
Some patterns seen in terminal key escape codes, derived from combos seen
at http://www.midnight-commander.org/browser/lib/tty/key.c
ESC letter
ESC [ letter
ESC [ modifier letter
ESC [ 1 ; modifier letter
ESC [ num char
ESC [ num ; modifier char
ESC O letter
ESC O modifier letter
ESC O 1 ; modifier letter
ESC N letter
ESC [ [ num ; modifier char
ESC [ [ 1 ; modifier letter
ESC ESC [ num char
ESC ESC O letter
- char is usually ~ but $ and ^ also happen with rxvt
- modifier is 1 +
(shift * 1) +
(left_alt * 2) +
(ctrl * 4) +
(right_alt * 8)
- two leading ESCs apparently mean the same as one leading ESC
*/
// Regexes used for ansi escape code splitting
var metaKeyCodeReAnywhere = /(?:\x1b)([a-zA-Z0-9])/;
var metaKeyCodeRe = new RegExp('^' + metaKeyCodeReAnywhere.source + '$');
var functionKeyCodeReAnywhere = new RegExp('(?:\x1b+)(O|N|\\[|\\[\\[)(?:' + [
'(\\d+)(?:;(\\d+))?([~^$])',
'(?:M([@ #!a`])(.)(.))', // mouse
'(?:1;)?(\\d+)?([a-zA-Z])'
].join('|') + ')');
var functionKeyCodeRe = new RegExp('^' + functionKeyCodeReAnywhere.source);
var escapeCodeReAnywhere = new RegExp([
functionKeyCodeReAnywhere.source, metaKeyCodeReAnywhere.source, /\x1b./.source
].join('|'));
function emitKeys(stream, s) {
var ch,
key = {
name: undefined,
ctrl: false,
meta: false,
shift: false
},
parts;
if (util.isBuffer(s)) {
if (s[0] > 127 && util.isUndefined(s[1])) {
s[0] -= 128;
s = '\x1b' + s.toString(stream.encoding || 'utf-8');
} else {
s = s.toString(stream.encoding || 'utf-8');
}
}
var buffer = [];
var match;
while (match = escapeCodeReAnywhere.exec(s)) {
buffer = buffer.concat(s.slice(0, match.index).split(''));
buffer.push(match[0]);
s = s.slice(match.index + match[0].length);
}
buffer = buffer.concat(s.split(''));
buffer.forEach(function(s) {
key.sequence = s;
if (s === '\r') {
// carriage return
key.name = 'return';
} else if (s === '\n') {
// enter, should have been called linefeed
key.name = 'enter';
} else if (s === '\t') {
// tab
key.name = 'tab';
} else if (s === '\b' || s === '\x7f' ||
s === '\x1b\x7f' || s === '\x1b\b') {
// backspace or ctrl+h
key.name = 'backspace';
key.meta = (s.charAt(0) === '\x1b');
} else if (s === '\x1b' || s === '\x1b\x1b') {
// escape key
key.name = 'escape';
key.meta = (s.length === 2);
} else if (s === ' ' || s === '\x1b ') {
key.name = 'space';
key.meta = (s.length === 2);
} else if (s.length === 1 && s <= '\x1a') {
// ctrl+letter
key.name = String.fromCharCode(s.charCodeAt(0) + 'a'.charCodeAt(0) - 1);
key.ctrl = true;
} else if (s.length === 1 && s >= 'a' && s <= 'z') {
// lowercase letter
key.name = s;
} else if (s.length === 1 && s >= 'A' && s <= 'Z') {
// shift+letter
key.name = s.toLowerCase();
key.shift = true;
} else if (parts = metaKeyCodeRe.exec(s)) {
// meta+character key
key.name = parts[1].toLowerCase();
key.meta = true;
key.shift = /^[A-Z]$/.test(parts[1]);
} else if (parts = functionKeyCodeRe.exec(s)) {
// ansi escape sequence
// reassemble the key code leaving out leading \x1b's,
// the modifier key bitflag and any meaningless "1;" sequence
var code = (parts[1] || '') + (parts[2] || '') +
(parts[4] || '') + (parts[9] || ''),
modifier = (parts[3] || parts[8] || 1) - 1;
// Parse the key modifier
key.ctrl = !!(modifier & 4);
key.meta = !!(modifier & 10);
key.shift = !!(modifier & 1);
key.code = code;
// Parse the key itself
switch (code) {
/* xterm/gnome ESC O letter */
case 'OP': key.name = 'f1'; break;
case 'OQ': key.name = 'f2'; break;
case 'OR': key.name = 'f3'; break;
case 'OS': key.name = 'f4'; break;
/* xterm/rxvt ESC [ number ~ */
case '[11~': key.name = 'f1'; break;
case '[12~': key.name = 'f2'; break;
case '[13~': key.name = 'f3'; break;
case '[14~': key.name = 'f4'; break;
/* from Cygwin and used in libuv */
case '[[A': key.name = 'f1'; break;
case '[[B': key.name = 'f2'; break;
case '[[C': key.name = 'f3'; break;
case '[[D': key.name = 'f4'; break;
case '[[E': key.name = 'f5'; break;
/* common */
case '[15~': key.name = 'f5'; break;
case '[17~': key.name = 'f6'; break;
case '[18~': key.name = 'f7'; break;
case '[19~': key.name = 'f8'; break;
case '[20~': key.name = 'f9'; break;
case '[21~': key.name = 'f10'; break;
case '[23~': key.name = 'f11'; break;
case '[24~': key.name = 'f12'; break;
/* xterm ESC [ letter */
case '[A': key.name = 'up'; break;
case '[B': key.name = 'down'; break;
case '[C': key.name = 'right'; break;
case '[D': key.name = 'left'; break;
case '[E': key.name = 'clear'; break;
case '[F': key.name = 'end'; break;
case '[H': key.name = 'home'; break;
/* xterm/gnome ESC O letter */
case 'OA': key.name = 'up'; break;
case 'OB': key.name = 'down'; break;
case 'OC': key.name = 'right'; break;
case 'OD': key.name = 'left'; break;
case 'OE': key.name = 'clear'; break;
case 'OF': key.name = 'end'; break;
case 'OH': key.name = 'home'; break;
/* xterm/rxvt ESC [ number ~ */
case '[1~': key.name = 'home'; break;
case '[2~': key.name = 'insert'; break;
case '[3~': key.name = 'delete'; break;
case '[4~': key.name = 'end'; break;
case '[5~': key.name = 'pageup'; break;
case '[6~': key.name = 'pagedown'; break;
/* putty */
case '[[5~': key.name = 'pageup'; break;
case '[[6~': key.name = 'pagedown'; break;
/* rxvt */
case '[7~': key.name = 'home'; break;
case '[8~': key.name = 'end'; break;
/* rxvt keys with modifiers */
case '[a': key.name = 'up'; key.shift = true; break;
case '[b': key.name = 'down'; key.shift = true; break;
case '[c': key.name = 'right'; key.shift = true; break;
case '[d': key.name = 'left'; key.shift = true; break;
case '[e': key.name = 'clear'; key.shift = true; break;
case '[2$': key.name = 'insert'; key.shift = true; break;
case '[3$': key.name = 'delete'; key.shift = true; break;
case '[5$': key.name = 'pageup'; key.shift = true; break;
case '[6$': key.name = 'pagedown'; key.shift = true; break;
case '[7$': key.name = 'home'; key.shift = true; break;
case '[8$': key.name = 'end'; key.shift = true; break;
case 'Oa': key.name = 'up'; key.ctrl = true; break;
case 'Ob': key.name = 'down'; key.ctrl = true; break;
case 'Oc': key.name = 'right'; key.ctrl = true; break;
case 'Od': key.name = 'left'; key.ctrl = true; break;
case 'Oe': key.name = 'clear'; key.ctrl = true; break;
case '[2^': key.name = 'insert'; key.ctrl = true; break;
case '[3^': key.name = 'delete'; key.ctrl = true; break;
case '[5^': key.name = 'pageup'; key.ctrl = true; break;
case '[6^': key.name = 'pagedown'; key.ctrl = true; break;
case '[7^': key.name = 'home'; key.ctrl = true; break;
case '[8^': key.name = 'end'; key.ctrl = true; break;
/* misc. */
case '[Z': key.name = 'tab'; key.shift = true; break;
default: key.name = 'undefined'; break;
}
}
// Don't emit a key if no name was found
if (util.isUndefined(key.name)) {
key = undefined;
}
if (s.length === 1) {
ch = s;
}
if (key || ch) {
stream.emit('keypress', ch, key);
}
});
}
/**
* moves the cursor to the x and y coordinate on the given stream
*/
function cursorTo(stream, x, y) {
if (!util.isNumber(x) && !util.isNumber(y))
return;
if (!util.isNumber(x))
throw new Error("Can't set cursor row without also setting it's column");
if (!util.isNumber(y)) {
stream.write('\x1b[' + (x + 1) + 'G');
} else {
stream.write('\x1b[' + (y + 1) + ';' + (x + 1) + 'H');
}
}
exports.cursorTo = cursorTo;
/**
* moves the cursor relative to its current location
*/
function moveCursor(stream, dx, dy) {
if (dx < 0) {
stream.write('\x1b[' + (-dx) + 'D');
} else if (dx > 0) {
stream.write('\x1b[' + dx + 'C');
}
if (dy < 0) {
stream.write('\x1b[' + (-dy) + 'A');
} else if (dy > 0) {
stream.write('\x1b[' + dy + 'B');
}
}
exports.moveCursor = moveCursor;
/**
* clears the current line the cursor is on:
* -1 for left of the cursor
* +1 for right of the cursor
* 0 for the entire line
*/
function clearLine(stream, dir) {
if (dir < 0) {
// to the beginning
stream.write('\x1b[1K');
} else if (dir > 0) {
// to the end
stream.write('\x1b[0K');
} else {
// entire line
stream.write('\x1b[2K');
}
}
exports.clearLine = clearLine;
/**
* clears the screen from the current position of the cursor down
*/
function clearScreenDown(stream) {
stream.write('\x1b[0J');
}
exports.clearScreenDown = clearScreenDown;
/**
* Returns the number of columns required to display the given string.
*/
function getStringWidth(str) {
var width = 0;
str = stripVTControlCharacters(str);
for (var i = 0, len = str.length; i < len; i++) {
var code = codePointAt(str, i);
if (code >= 0x10000) { // surrogates
i++;
}
if (isFullWidthCodePoint(code)) {
width += 2;
} else {
width++;
}
}
return width;
}
exports.getStringWidth = getStringWidth;
/**
* Returns true if the character represented by a given
* Unicode code point is full-width. Otherwise returns false.
*/
function isFullWidthCodePoint(code) {
if (isNaN(code)) {
return false;
}
// Code points are derived from:
// http://www.unicode.org/Public/UNIDATA/EastAsianWidth.txt
if (code >= 0x1100 && (
code <= 0x115f || // Hangul Jamo
0x2329 === code || // LEFT-POINTING ANGLE BRACKET
0x232a === code || // RIGHT-POINTING ANGLE BRACKET
// CJK Radicals Supplement .. Enclosed CJK Letters and Months
(0x2e80 <= code && code <= 0x3247 && code !== 0x303f) ||
// Enclosed CJK Letters and Months .. CJK Unified Ideographs Extension A
0x3250 <= code && code <= 0x4dbf ||
// CJK Unified Ideographs .. Yi Radicals
0x4e00 <= code && code <= 0xa4c6 ||
// Hangul Jamo Extended-A
0xa960 <= code && code <= 0xa97c ||
// Hangul Syllables
0xac00 <= code && code <= 0xd7a3 ||
// CJK Compatibility Ideographs
0xf900 <= code && code <= 0xfaff ||
// Vertical Forms
0xfe10 <= code && code <= 0xfe19 ||
// CJK Compatibility Forms .. Small Form Variants
0xfe30 <= code && code <= 0xfe6b ||
// Halfwidth and Fullwidth Forms
0xff01 <= code && code <= 0xff60 ||
0xffe0 <= code && code <= 0xffe6 ||
// Kana Supplement
0x1b000 <= code && code <= 0x1b001 ||
// Enclosed Ideographic Supplement
0x1f200 <= code && code <= 0x1f251 ||
// CJK Unified Ideographs Extension B .. Tertiary Ideographic Plane
0x20000 <= code && code <= 0x3fffd)) {
return true;
}
return false;
}
exports.isFullWidthCodePoint = isFullWidthCodePoint;
/**
* Returns the Unicode code point for the character at the
* given index in the given string. Similar to String.charCodeAt(),
* but this function handles surrogates (code point >= 0x10000).
*/
function codePointAt(str, index) {
var code = str.charCodeAt(index);
var low;
if (0xd800 <= code && code <= 0xdbff) { // High surrogate
low = str.charCodeAt(index + 1);
if (!isNaN(low)) {
code = 0x10000 + (code - 0xd800) * 0x400 + (low - 0xdc00);
}
}
return code;
}
exports.codePointAt = codePointAt;
/**
* Tries to remove all VT control characters. Use to estimate displayed
* string width. May be buggy due to not running a real state machine
*/
function stripVTControlCharacters(str) {
str = str.replace(new RegExp(functionKeyCodeReAnywhere.source, 'g'), '');
return str.replace(new RegExp(metaKeyCodeReAnywhere.source, 'g'), '');
}
exports.stripVTControlCharacters = stripVTControlCharacters;
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