node/lib/readline.js at master · anchnk/node · GitHub

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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

'use strict';

const { debug, inherits } = require('util');

const Buffer = require('buffer').Buffer;

const EventEmitter = require('events');

const {

CSI,

emitKeys,

getStringWidth,

isFullWidthCodePoint,

stripVTControlCharacters

} = require('internal/readline');

const {

kEscape,

kClearToBeginning,

kClearToEnd,

kClearLine,

kClearScreenDown

} = CSI;

const kHistorySize = 30;

const kMincrlfDelay = 100;

const kMaxcrlfDelay = 2000;

// \r\n, \n, or \r followed by something other than \n

const lineEnding = /\r?\n|\r(?!\n)/;

const KEYPRESS_DECODER = Symbol('keypress-decoder');

const ESCAPE_DECODER = Symbol('escape-decoder');

// GNU readline library - keyseq-timeout is 500ms (default)

const ESCAPE_CODE_TIMEOUT = 500;

function createInterface(input, output, completer, terminal) {

return new Interface(input, output, completer, terminal);

}

function Interface(input, output, completer, terminal) {

if (!(this instanceof Interface)) {

return new Interface(input, output, completer, terminal);

}

this._sawReturnAt = 0;

this.isCompletionEnabled = true;

this._sawKeyPress = false;

this._previousKey = null;

EventEmitter.call(this);

var historySize;

var removeHistoryDuplicates = false;

let crlfDelay;

let prompt = '> ';

if (input && input.input) {

// an options object was given

output = input.output;

completer = input.completer;

terminal = input.terminal;

historySize = input.historySize;

removeHistoryDuplicates = input.removeHistoryDuplicates;

if (input.prompt !== undefined) {

prompt = input.prompt;

}

crlfDelay = input.crlfDelay;

input = input.input;

}

if (completer && typeof completer !== 'function') {

throw new TypeError('Argument "completer" must be a function');

}

if (historySize === undefined) {

historySize = kHistorySize;

}

if (typeof historySize !== 'number' ||

isNaN(historySize) ||

historySize < 0) {

throw new TypeError('Argument "historySize" must be a positive number');

}

// backwards compat; check the isTTY prop of the output stream

// when `terminal` was not specified

if (terminal === undefined && !(output === null || output === undefined)) {

terminal = !!output.isTTY;

}

var self = this;

this.output = output;

this.input = input;

this.historySize = historySize;

this.removeHistoryDuplicates = !!removeHistoryDuplicates;

this.crlfDelay = Math.max(kMincrlfDelay,

Math.min(kMaxcrlfDelay, crlfDelay >>> 0));

// Check arity, 2 - for async, 1 for sync

if (typeof completer === 'function') {

this.completer = completer.length === 2 ? completer : function(v, cb) {

cb(null, completer(v));

};

}

this.setPrompt(prompt);

this.terminal = !!terminal;

function ondata(data) {

self._normalWrite(data);

}

function onend() {

if (typeof self._line_buffer === 'string' &&

self._line_buffer.length > 0) {

self.emit('line', self._line_buffer);

}

self.close();

}

function ontermend() {

if (typeof self.line === 'string' && self.line.length > 0) {

self.emit('line', self.line);

}

self.close();

}

function onkeypress(s, key) {

self._ttyWrite(s, key);

if (key && key.sequence) {

// if the key.sequence is half of a surrogate pair

// (>= 0xd800 and <= 0xdfff), refresh the line so

// the character is displayed appropriately.

const ch = key.sequence.codePointAt(0);

if (ch >= 0xd800 && ch <= 0xdfff)

self._refreshLine();

}

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 {

emitKeypressEvents(input, this);

// 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;

if (output !== null && output !== undefined)

output.on('resize', onresize);

self.once('close', function() {

input.removeListener('keypress', onkeypress);

input.removeListener('end', ontermend);

if (output !== null && output !== undefined) {

output.removeListener('resize', onresize);

}

});

}

input.resume();

}

inherits(Interface, EventEmitter);

Object.defineProperty(Interface.prototype, 'columns', {

configurable: true,

enumerable: true,

get: function() {

var columns = Infinity;

if (this.output && this.output.columns)

columns = this.output.columns;

return columns;

}

});

Interface.prototype.setPrompt = function(prompt) {

this._prompt = prompt;

};

Interface.prototype._setRawMode = function(mode) {

const wasInRawMode = this.input.isRaw;

if (typeof this.input.setRawMode === 'function') {

this.input.setRawMode(mode);

}

return wasInRawMode;

};

Interface.prototype.prompt = function(preserveCursor) {

if (this.paused) this.resume();

if (this.terminal) {

if (!preserveCursor) this.cursor = 0;

this._refreshLine();

} else {

this._writeToOutput(this._prompt);

}

};

Interface.prototype.question = function(query, cb) {

if (typeof cb === 'function') {

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._writeToOutput = function _writeToOutput(stringToWrite) {

if (typeof stringToWrite !== 'string')

throw new TypeError('"stringToWrite" argument must be a string');

if (this.output !== null && this.output !== undefined)

this.output.write(stringToWrite);

};

Interface.prototype._addHistory = function() {

if (this.line.length === 0) return '';

// if the history is disabled then return the line

if (this.historySize === 0) return this.line;

// if the trimmed line is empty then return the line

if (this.line.trim().length === 0) return this.line;

if (this.history.length === 0 || this.history[0] !== this.line) {

if (this.removeHistoryDuplicates) {

// Remove older history line if identical to new one

const dupIndex = this.history.indexOf(this.line);

if (dupIndex !== -1) this.history.splice(dupIndex, 1);

}

this.history.unshift(this.line);

// Only store so many

if (this.history.length > this.historySize) 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) {

moveCursor(this.output, 0, -prevRows);

}

// Cursor to left edge.

cursorTo(this.output, 0);

// erase data

clearScreenDown(this.output);

// Write the prompt and the current buffer content.

this._writeToOutput(line);

// Force terminal to allocate a new line

if (lineCols === 0) {

this._writeToOutput(' ');

}

// Move cursor to original position.

cursorTo(this.output, cursorPos.cols);

var diff = lineRows - cursorPos.rows;

if (diff > 0) {

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);

};

Interface.prototype._normalWrite = function(b) {

if (b === undefined) {

return;

}

var string = this._decoder.write(b);

if (this._sawReturnAt &&

Date.now() - this._sawReturnAt <= this.crlfDelay) {

string = string.replace(/^\n/, '');

this._sawReturnAt = 0;

}

// Run test() on the new string chunk, not on the entire line buffer.

var newPartContainsEnding = lineEnding.test(string);

if (this._line_buffer) {

string = this._line_buffer + string;

this._line_buffer = null;

}

if (newPartContainsEnding) {

this._sawReturnAt = string.endsWith('\r') ? Date.now() : 0;

// got one or more newlines; process into "line" events

var lines = string.split(lineEnding);

// either '' or (conceivably) the unfinished portion of the next line

string = lines.pop();

this._line_buffer = string;

for (var n = 0; n < lines.length; n++)

this._onLine(lines[n]);

} else if (string) {

// no newlines this time, save what we have for next time

this._line_buffer = string;

}

};

Interface.prototype._insertString = function(c) {

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._writeToOutput(c);

}

// a hack to get the line refreshed if it's needed

this._moveCursor(0);

}

};

Interface.prototype._tabComplete = function(lastKeypressWasTab) {

var self = this;

self.pause();

self.completer(self.line.slice(0, self.cursor), function(err, rv) {

self.resume();

if (err) {

debug('tab completion error %j', err);

return;

}

const completions = rv[0];

const completeOn = rv[1]; // the text that was completed

if (completions && completions.length) {

// Apply/show completions.

if (lastKeypressWasTab) {

self._writeToOutput('\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);

if (!maxColumns || maxColumns === Infinity) {

maxColumns = 1;

}

var group = [];

for (var i = 0, compLen = completions.length; i < compLen; i++) {

var 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._writeToOutput(item);

if (col < maxColumns - 1) {

for (var s = 0, itemLen = item.length; s < width - itemLen;

s++) {

self._writeToOutput(' ');

}

self._writeToOutput('\r\n');

}

self._writeToOutput('\r\n');

}

function commonPrefix(strings) {

if (!strings || strings.length === 0) {

return '';

}

if (strings.length === 1) return strings[0];

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._writeToOutput('\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 = str.codePointAt(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(this.line.codePointAt(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)

);

}

moveCursor(this.output, diffWidth, 0);

this.prevRows = newPos.rows;

} else {

this._refreshLine();

}

};

// handle a write from the tty

Interface.prototype._ttyWrite = function(s, key) {

const previousKey = this._previousKey;

key = key || {};

this._previousKey = 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 (this.listenerCount('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

cursorTo(this.output, 0, 0);

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 (this.listenerCount('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 '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._sawReturnAt && key.name !== 'enter')

this._sawReturnAt = 0;

switch (key.name) {

case 'return': // carriage return, i.e. \r

this._sawReturnAt = Date.now();

this._line();

break;

case 'enter':

// When key interval > crlfDelay

if (this._sawReturnAt === 0 ||

Date.now() - this._sawReturnAt > this.crlfDelay) {

this._line();

}

this._sawReturnAt = 0;

break;

case 'backspace':

this._deleteLeft();

break;

case 'delete':

this._deleteRight();

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;

case 'tab':

// If tab completion enabled, do that...

if (typeof this.completer === 'function' && this.isCompletionEnabled) {

const lastKeypressWasTab = previousKey && previousKey.name === 'tab';

this._tabComplete(lastKeypressWasTab);

break;

}

// falls through

default:

if (s instanceof Buffer)

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]);

}

};

/**

* accepts a readable Stream instance and makes it emit "keypress" events

function emitKeypressEvents(stream, iface) {

if (stream[KEYPRESS_DECODER]) return;

var StringDecoder = require('string_decoder').StringDecoder; // lazy load

stream[KEYPRESS_DECODER] = new StringDecoder('utf8');

stream[ESCAPE_DECODER] = emitKeys(stream);

stream[ESCAPE_DECODER].next();

const escapeCodeTimeout = () => stream[ESCAPE_DECODER].next('');

let timeoutId;

function onData(b) {

if (stream.listenerCount('keypress') > 0) {

var r = stream[KEYPRESS_DECODER].write(b);

if (r) {

clearTimeout(timeoutId);

if (iface) {

iface._sawKeyPress = r.length === 1;

}

for (var i = 0; i < r.length; i++) {

if (r[i] === '\t' && typeof r[i + 1] === 'string' && iface) {

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node/lib/readline.js at master · anchnk/node · GitHub

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