diff options
| -rw-r--r-- | js/ansi/ansi.js | 405 | ||||
| -rw-r--r-- | js/ansi/newlines.js | 71 | ||||
| -rwxr-xr-x | js/test.js | 2 |
3 files changed, 477 insertions, 1 deletions
diff --git a/js/ansi/ansi.js b/js/ansi/ansi.js new file mode 100644 index 0000000..52fc8ec --- /dev/null +++ b/js/ansi/ansi.js @@ -0,0 +1,405 @@ + +/** + * References: + * + * - http://en.wikipedia.org/wiki/ANSI_escape_code + * - http://www.termsys.demon.co.uk/vtansi.htm + * + */ + +/** + * Module dependencies. + */ + +var emitNewlineEvents = require('./newlines') + , prefix = '\x1b[' // For all escape codes + , suffix = 'm' // Only for color codes + +/** + * The ANSI escape sequences. + */ + +var codes = { + up: 'A' + , down: 'B' + , forward: 'C' + , back: 'D' + , nextLine: 'E' + , previousLine: 'F' + , horizontalAbsolute: 'G' + , eraseData: 'J' + , eraseLine: 'K' + , scrollUp: 'S' + , scrollDown: 'T' + , savePosition: 's' + , restorePosition: 'u' + , queryPosition: '6n' + , hide: '?25l' + , show: '?25h' +} + +/** + * Rendering ANSI codes. + */ + +var styles = { + bold: 1 + , italic: 3 + , underline: 4 + , inverse: 7 +} + +/** + * The negating ANSI code for the rendering modes. + */ + +var reset = { + bold: 22 + , italic: 23 + , underline: 24 + , inverse: 27 +} + +/** + * The standard, styleable ANSI colors. + */ + +var colors = { + white: 37 + , black: 30 + , blue: 34 + , cyan: 36 + , green: 32 + , magenta: 35 + , red: 31 + , yellow: 33 + , grey: 90 + , brightBlack: 90 + , brightRed: 91 + , brightGreen: 92 + , brightYellow: 93 + , brightBlue: 94 + , brightMagenta: 95 + , brightCyan: 96 + , brightWhite: 97 +} + + +/** + * Creates a Cursor instance based off the given `writable stream` instance. + */ + +function ansi (stream, options) { + if (stream._ansicursor) { + return stream._ansicursor + } else { + return stream._ansicursor = new Cursor(stream, options) + } +} +module.exports = exports = ansi + +/** + * The `Cursor` class. + */ + +function Cursor (stream, options) { + if (!(this instanceof Cursor)) { + return new Cursor(stream, options) + } + if (typeof stream != 'object' || typeof stream.write != 'function') { + throw new Error('a valid Stream instance must be passed in') + } + + // the stream to use + this.stream = stream + + // when 'enabled' is false then all the functions are no-ops except for write() + this.enabled = options && options.enabled + if (typeof this.enabled === 'undefined') { + this.enabled = stream.isTTY + } + this.enabled = !!this.enabled + + // then `buffering` is true, then `write()` calls are buffered in + // memory until `flush()` is invoked + this.buffering = !!(options && options.buffering) + this._buffer = [] + + // controls the foreground and background colors + this.fg = this.foreground = new Colorer(this, 0) + this.bg = this.background = new Colorer(this, 10) + + // defaults + this.Bold = false + this.Italic = false + this.Underline = false + this.Inverse = false + + // keep track of the number of "newlines" that get encountered + this.newlines = 0 + emitNewlineEvents(stream) + stream.on('newline', function () { + this.newlines++ + }.bind(this)) +} +exports.Cursor = Cursor + +/** + * Helper function that calls `write()` on the underlying Stream. + * Returns `this` instead of the write() return value to keep + * the chaining going. + */ + +Cursor.prototype.write = function (data) { + if (this.buffering) { + this._buffer.push(arguments) + } else { + this.stream.write.apply(this.stream, arguments) + } + return this +} + +/** + * Buffer `write()` calls into memory. + * + * @api public + */ + +Cursor.prototype.buffer = function () { + this.buffering = true + return this +} + +/** + * Write out the in-memory buffer. + * + * @api public + */ + +Cursor.prototype.flush = function () { + this.buffering = false + var str = this._buffer.map(function (args) { + if (args.length != 1) throw new Error('unexpected args length! ' + args.length); + return args[0]; + }).join(''); + this._buffer.splice(0); // empty + this.write(str); + return this +} + + +/** + * The `Colorer` class manages both the background and foreground colors. + */ + +function Colorer (cursor, base) { + this.current = null + this.cursor = cursor + this.base = base +} +exports.Colorer = Colorer + +/** + * Write an ANSI color code, ensuring that the same code doesn't get rewritten. + */ + +Colorer.prototype._setColorCode = function setColorCode (code) { + var c = String(code) + if (this.current === c) return + this.cursor.enabled && this.cursor.write(prefix + c + suffix) + this.current = c + return this +} + + +/** + * Set up the positional ANSI codes. + */ + +Object.keys(codes).forEach(function (name) { + var code = String(codes[name]) + Cursor.prototype[name] = function () { + var c = code + if (arguments.length > 0) { + c = toArray(arguments).map(Math.round).join(';') + code + } + this.enabled && this.write(prefix + c) + return this + } +}) + +/** + * Set up the functions for the rendering ANSI codes. + */ + +Object.keys(styles).forEach(function (style) { + var name = style[0].toUpperCase() + style.substring(1) + , c = styles[style] + , r = reset[style] + + Cursor.prototype[style] = function () { + if (this[name]) return + this.enabled && this.write(prefix + c + suffix) + this[name] = true + return this + } + + Cursor.prototype['reset' + name] = function () { + if (!this[name]) return + this.enabled && this.write(prefix + r + suffix) + this[name] = false + return this + } +}) + +/** + * Setup the functions for the standard colors. + */ + +Object.keys(colors).forEach(function (color) { + var code = colors[color] + + Colorer.prototype[color] = function () { + this._setColorCode(this.base + code) + return this.cursor + } + + Cursor.prototype[color] = function () { + return this.foreground[color]() + } +}) + +/** + * Makes a beep sound! + */ + +Cursor.prototype.beep = function () { + this.enabled && this.write('\x07') + return this +} + +/** + * Moves cursor to specific position + */ + +Cursor.prototype.goto = function (x, y) { + x = x | 0 + y = y | 0 + this.enabled && this.write(prefix + y + ';' + x + 'H') + return this +} + +/** + * Resets the color. + */ + +Colorer.prototype.reset = function () { + this._setColorCode(this.base + 39) + return this.cursor +} + +/** + * Resets all ANSI formatting on the stream. + */ + +Cursor.prototype.reset = function () { + this.enabled && this.write(prefix + '0' + suffix) + this.Bold = false + this.Italic = false + this.Underline = false + this.Inverse = false + this.foreground.current = null + this.background.current = null + return this +} + +/** + * Sets the foreground color with the given RGB values. + * The closest match out of the 216 colors is picked. + */ + +Colorer.prototype.rgb = function (r, g, b) { + var base = this.base + 38 + , code = rgb(r, g, b) + this._setColorCode(base + ';5;' + code) + return this.cursor +} + +/** + * Same as `cursor.fg.rgb(r, g, b)`. + */ + +Cursor.prototype.rgb = function (r, g, b) { + return this.foreground.rgb(r, g, b) +} + +/** + * Accepts CSS color codes for use with ANSI escape codes. + * For example: `#FF000` would be bright red. + */ + +Colorer.prototype.hex = function (color) { + return this.rgb.apply(this, hex(color)) +} + +/** + * Same as `cursor.fg.hex(color)`. + */ + +Cursor.prototype.hex = function (color) { + return this.foreground.hex(color) +} + + +// UTIL FUNCTIONS // + +/** + * Translates a 255 RGB value to a 0-5 ANSI RGV value, + * then returns the single ANSI color code to use. + */ + +function rgb (r, g, b) { + var red = r / 255 * 5 + , green = g / 255 * 5 + , blue = b / 255 * 5 + return rgb5(red, green, blue) +} + +/** + * Turns rgb 0-5 values into a single ANSI color code to use. + */ + +function rgb5 (r, g, b) { + var red = Math.round(r) + , green = Math.round(g) + , blue = Math.round(b) + return 16 + (red*36) + (green*6) + blue +} + +/** + * Accepts a hex CSS color code string (# is optional) and + * translates it into an Array of 3 RGB 0-255 values, which + * can then be used with rgb(). + */ + +function hex (color) { + var c = color[0] === '#' ? color.substring(1) : color + , r = c.substring(0, 2) + , g = c.substring(2, 4) + , b = c.substring(4, 6) + return [parseInt(r, 16), parseInt(g, 16), parseInt(b, 16)] +} + +/** + * Turns an array-like object into a real array. + */ + +function toArray (a) { + var i = 0 + , l = a.length + , rtn = [] + for (; i<l; i++) { + rtn.push(a[i]) + } + return rtn +} diff --git a/js/ansi/newlines.js b/js/ansi/newlines.js new file mode 100644 index 0000000..4e37a0a --- /dev/null +++ b/js/ansi/newlines.js @@ -0,0 +1,71 @@ + +/** + * Accepts any node Stream instance and hijacks its "write()" function, + * so that it can count any newlines that get written to the output. + * + * When a '\n' byte is encountered, then a "newline" event will be emitted + * on the stream, with no arguments. It is up to the listeners to determine + * any necessary deltas required for their use-case. + * + * Ex: + * + * var cursor = ansi(process.stdout) + * , ln = 0 + * process.stdout.on('newline', function () { + * ln++ + * }) + */ + +/** + * Module dependencies. + */ + +var assert = require('assert') +var NEWLINE = '\n'.charCodeAt(0) + +function emitNewlineEvents (stream) { + if (stream._emittingNewlines) { + // already emitting newline events + return + } + + var write = stream.write + + stream.write = function (data) { + // first write the data + var rtn = write.apply(stream, arguments) + + if (stream.listeners('newline').length > 0) { + var len = data.length + , i = 0 + // now try to calculate any deltas + if (typeof data == 'string') { + for (; i<len; i++) { + processByte(stream, data.charCodeAt(i)) + } + } else { + // buffer + for (; i<len; i++) { + processByte(stream, data[i]) + } + } + } + + return rtn + } + + stream._emittingNewlines = true +} +module.exports = emitNewlineEvents + + +/** + * Processes an individual byte being written to a stream + */ + +function processByte (stream, b) { + assert.equal(typeof b, 'number') + if (b === NEWLINE) { + stream.emit('newline') + } +} @@ -3,7 +3,7 @@ var fs = require('fs'); var util = require('util'); var stmd = require('./stmd'); -var ansi = require('ansi') +var ansi = require('./ansi/ansi') var cursor = ansi(process.stdout); var writer = new stmd.HtmlRenderer(); |