mirror of
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CB-14145 commit updated node_modules in 7.1.x only
(installed by npm@6.1.0)
This commit is contained in:
Christopher J. Brody
+405
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/**
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* References:
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*
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* - http://en.wikipedia.org/wiki/ANSI_escape_code
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* - http://www.termsys.demon.co.uk/vtansi.htm
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*
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*/
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/**
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* Module dependencies.
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*/
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var emitNewlineEvents = require('./newlines')
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, prefix = '\x1b[' // For all escape codes
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, suffix = 'm' // Only for color codes
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/**
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* The ANSI escape sequences.
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*/
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var codes = {
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up: 'A'
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, down: 'B'
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, forward: 'C'
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, back: 'D'
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, nextLine: 'E'
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, previousLine: 'F'
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, horizontalAbsolute: 'G'
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, eraseData: 'J'
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, eraseLine: 'K'
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, scrollUp: 'S'
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, scrollDown: 'T'
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, savePosition: 's'
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, restorePosition: 'u'
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, queryPosition: '6n'
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, hide: '?25l'
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, show: '?25h'
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}
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/**
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* Rendering ANSI codes.
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*/
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var styles = {
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bold: 1
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, italic: 3
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, underline: 4
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, inverse: 7
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}
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/**
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* The negating ANSI code for the rendering modes.
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*/
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var reset = {
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bold: 22
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, italic: 23
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, underline: 24
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, inverse: 27
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}
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/**
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* The standard, styleable ANSI colors.
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*/
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var colors = {
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white: 37
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, black: 30
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, blue: 34
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, cyan: 36
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, green: 32
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, magenta: 35
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, red: 31
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, yellow: 33
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, grey: 90
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, brightBlack: 90
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, brightRed: 91
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, brightGreen: 92
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, brightYellow: 93
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, brightBlue: 94
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, brightMagenta: 95
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, brightCyan: 96
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, brightWhite: 97
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}
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/**
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* Creates a Cursor instance based off the given `writable stream` instance.
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*/
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function ansi (stream, options) {
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if (stream._ansicursor) {
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return stream._ansicursor
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} else {
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return stream._ansicursor = new Cursor(stream, options)
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}
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}
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module.exports = exports = ansi
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/**
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* The `Cursor` class.
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*/
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function Cursor (stream, options) {
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if (!(this instanceof Cursor)) {
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return new Cursor(stream, options)
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}
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if (typeof stream != 'object' || typeof stream.write != 'function') {
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throw new Error('a valid Stream instance must be passed in')
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}
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// the stream to use
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this.stream = stream
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// when 'enabled' is false then all the functions are no-ops except for write()
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this.enabled = options && options.enabled
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if (typeof this.enabled === 'undefined') {
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this.enabled = stream.isTTY
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}
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this.enabled = !!this.enabled
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// then `buffering` is true, then `write()` calls are buffered in
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// memory until `flush()` is invoked
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this.buffering = !!(options && options.buffering)
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this._buffer = []
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// controls the foreground and background colors
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this.fg = this.foreground = new Colorer(this, 0)
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this.bg = this.background = new Colorer(this, 10)
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// defaults
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this.Bold = false
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this.Italic = false
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this.Underline = false
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this.Inverse = false
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// keep track of the number of "newlines" that get encountered
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this.newlines = 0
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emitNewlineEvents(stream)
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stream.on('newline', function () {
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this.newlines++
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}.bind(this))
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}
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exports.Cursor = Cursor
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/**
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* Helper function that calls `write()` on the underlying Stream.
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* Returns `this` instead of the write() return value to keep
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* the chaining going.
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*/
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Cursor.prototype.write = function (data) {
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if (this.buffering) {
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this._buffer.push(arguments)
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} else {
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this.stream.write.apply(this.stream, arguments)
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}
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return this
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}
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/**
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* Buffer `write()` calls into memory.
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*
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* @api public
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*/
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Cursor.prototype.buffer = function () {
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this.buffering = true
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return this
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}
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/**
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* Write out the in-memory buffer.
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*
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* @api public
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*/
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Cursor.prototype.flush = function () {
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this.buffering = false
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var str = this._buffer.map(function (args) {
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if (args.length != 1) throw new Error('unexpected args length! ' + args.length);
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return args[0];
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}).join('');
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this._buffer.splice(0); // empty
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this.write(str);
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return this
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}
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/**
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* The `Colorer` class manages both the background and foreground colors.
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*/
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function Colorer (cursor, base) {
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this.current = null
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this.cursor = cursor
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this.base = base
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}
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exports.Colorer = Colorer
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/**
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* Write an ANSI color code, ensuring that the same code doesn't get rewritten.
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*/
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Colorer.prototype._setColorCode = function setColorCode (code) {
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var c = String(code)
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if (this.current === c) return
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this.cursor.enabled && this.cursor.write(prefix + c + suffix)
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this.current = c
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return this
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}
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/**
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* Set up the positional ANSI codes.
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*/
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Object.keys(codes).forEach(function (name) {
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var code = String(codes[name])
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Cursor.prototype[name] = function () {
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var c = code
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if (arguments.length > 0) {
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c = toArray(arguments).map(Math.round).join(';') + code
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}
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this.enabled && this.write(prefix + c)
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return this
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}
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})
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/**
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* Set up the functions for the rendering ANSI codes.
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*/
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Object.keys(styles).forEach(function (style) {
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var name = style[0].toUpperCase() + style.substring(1)
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, c = styles[style]
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, r = reset[style]
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Cursor.prototype[style] = function () {
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if (this[name]) return this
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this.enabled && this.write(prefix + c + suffix)
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this[name] = true
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return this
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}
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Cursor.prototype['reset' + name] = function () {
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if (!this[name]) return this
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this.enabled && this.write(prefix + r + suffix)
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this[name] = false
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return this
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}
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})
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/**
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* Setup the functions for the standard colors.
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*/
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Object.keys(colors).forEach(function (color) {
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var code = colors[color]
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Colorer.prototype[color] = function () {
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this._setColorCode(this.base + code)
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return this.cursor
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}
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Cursor.prototype[color] = function () {
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return this.foreground[color]()
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}
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})
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/**
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* Makes a beep sound!
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*/
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Cursor.prototype.beep = function () {
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this.enabled && this.write('\x07')
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return this
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}
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/**
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* Moves cursor to specific position
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*/
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Cursor.prototype.goto = function (x, y) {
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x = x | 0
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y = y | 0
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this.enabled && this.write(prefix + y + ';' + x + 'H')
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return this
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}
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/**
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* Resets the color.
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*/
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Colorer.prototype.reset = function () {
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this._setColorCode(this.base + 39)
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return this.cursor
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}
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/**
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* Resets all ANSI formatting on the stream.
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*/
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Cursor.prototype.reset = function () {
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this.enabled && this.write(prefix + '0' + suffix)
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this.Bold = false
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this.Italic = false
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this.Underline = false
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this.Inverse = false
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this.foreground.current = null
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this.background.current = null
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return this
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}
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/**
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* Sets the foreground color with the given RGB values.
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* The closest match out of the 216 colors is picked.
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*/
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Colorer.prototype.rgb = function (r, g, b) {
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var base = this.base + 38
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, code = rgb(r, g, b)
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this._setColorCode(base + ';5;' + code)
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return this.cursor
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}
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/**
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* Same as `cursor.fg.rgb(r, g, b)`.
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*/
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Cursor.prototype.rgb = function (r, g, b) {
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return this.foreground.rgb(r, g, b)
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}
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/**
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* Accepts CSS color codes for use with ANSI escape codes.
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* For example: `#FF000` would be bright red.
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*/
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Colorer.prototype.hex = function (color) {
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return this.rgb.apply(this, hex(color))
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}
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/**
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* Same as `cursor.fg.hex(color)`.
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*/
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Cursor.prototype.hex = function (color) {
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return this.foreground.hex(color)
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}
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// UTIL FUNCTIONS //
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/**
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* Translates a 255 RGB value to a 0-5 ANSI RGV value,
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* then returns the single ANSI color code to use.
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*/
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function rgb (r, g, b) {
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var red = r / 255 * 5
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, green = g / 255 * 5
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, blue = b / 255 * 5
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return rgb5(red, green, blue)
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}
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/**
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* Turns rgb 0-5 values into a single ANSI color code to use.
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*/
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function rgb5 (r, g, b) {
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var red = Math.round(r)
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, green = Math.round(g)
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, blue = Math.round(b)
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return 16 + (red*36) + (green*6) + blue
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}
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/**
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* Accepts a hex CSS color code string (# is optional) and
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* translates it into an Array of 3 RGB 0-255 values, which
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* can then be used with rgb().
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*/
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function hex (color) {
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var c = color[0] === '#' ? color.substring(1) : color
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, r = c.substring(0, 2)
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, g = c.substring(2, 4)
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, b = c.substring(4, 6)
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return [parseInt(r, 16), parseInt(g, 16), parseInt(b, 16)]
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}
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/**
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* Turns an array-like object into a real array.
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*/
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function toArray (a) {
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var i = 0
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, l = a.length
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, rtn = []
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for (; i<l; i++) {
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rtn.push(a[i])
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}
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return rtn
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}
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