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Viewing file:     index.js (7.82 KB)      -rw-r--r--

(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  (global = global || self, global.ansi = factory());
}(this, function () { 'use strict';

  /**
   * Takes any input and guarantees an array back.
   *
   * - converts array-like objects (e.g. `arguments`) to a real array
   * - converts `undefined` to an empty array
   * - converts any another other, singular value (including `null`) into an array containing that value
   * - ignores input which is already an array
   *
   * @module array-back
   * @example
   * > const arrayify = require('array-back')
   *
   * > arrayify(undefined)
   * []
   *
   * > arrayify(null)
   * [ null ]
   *
   * > arrayify(0)
   * [ 0 ]
   *
   * > arrayify([ 1, 2 ])
   * [ 1, 2 ]
   *
   * > function f(){ return arrayify(arguments); }
   * > f(1,2,3)
   * [ 1, 2, 3 ]
   */

  function isObject (input) {
    return typeof input === 'object' && input !== null
  }

  function isArrayLike (input) {
    return isObject(input) && typeof input.length === 'number'
  }

  /**
   * @param {*} - the input value to convert to an array
   * @returns {Array}
   * @alias module:array-back
   */
  function arrayify (input) {
    if (Array.isArray(input)) {
      return input
    } else {
      if (input === undefined) {
        return []
      } else if (isArrayLike(input)) {
        return Array.prototype.slice.call(input)
      } else {
        return [ input ]
      }
    }
  }

  /* Control Sequence Initiator */
  const csi = '\x1b[';

  /**
   * @exports ansi-escape-sequences
   * @typicalname ansi
   * @example
   * const ansi = require('ansi-escape-sequences')
   */
  const ansi = {};

  /**
   * Various formatting styles (aka Select Graphic Rendition codes).
   * @enum {string}
   * @example
   * console.log(ansi.style.red + 'this is red' + ansi.style.reset)
   */
  ansi.style = {
    reset: '\x1b[0m',
    bold: '\x1b[1m',
    italic: '\x1b[3m',
    underline: '\x1b[4m',
    fontDefault: '\x1b[10m',
    font2: '\x1b[11m',
    font3: '\x1b[12m',
    font4: '\x1b[13m',
    font5: '\x1b[14m',
    font6: '\x1b[15m',
    imageNegative: '\x1b[7m',
    imagePositive: '\x1b[27m',
    black: '\x1b[30m',
    red: '\x1b[31m',
    green: '\x1b[32m',
    yellow: '\x1b[33m',
    blue: '\x1b[34m',
    magenta: '\x1b[35m',
    cyan: '\x1b[36m',
    white: '\x1b[37m',
    grey: '\x1b[90m',
    gray: '\x1b[90m',
    'bg-black': '\x1b[40m',
    'bg-red': '\x1b[41m',
    'bg-green': '\x1b[42m',
    'bg-yellow': '\x1b[43m',
    'bg-blue': '\x1b[44m',
    'bg-magenta': '\x1b[45m',
    'bg-cyan': '\x1b[46m',
    'bg-white': '\x1b[47m',
    'bg-grey': '\x1b[100m',
    'bg-gray': '\x1b[100m'
  };

  /**
   * style enum - used by `ansi.styles()`.
   * @enum {number}
   * @private
   */
  const eStyles = {
    reset: 0,
    bold: 1,
    italic: 3,
    underline: 4,
    imageNegative: 7,
    fontDefault: 10,
    font2: 11,
    font3: 12,
    font4: 13,
    font5: 14,
    font6: 15,
    imagePositive: 27,
    black: 30,
    red: 31,
    green: 32,
    yellow: 33,
    blue: 34,
    magenta: 35,
    cyan: 36,
    white: 37,
    grey: 90,
    gray: 90,
    'bg-black': 40,
    'bg-red': 41,
    'bg-green': 42,
    'bg-yellow': 43,
    'bg-blue': 44,
    'bg-magenta': 45,
    'bg-cyan': 46,
    'bg-white': 47,
    'bg-grey': 100,
    'bg-gray': 100
  };

  /**
   * Returns an ansi sequence setting one or more effects
   * @param {string | string[]} - a style, or list or styles
   * @returns {string}
   * @example
   * > ansi.styles('green')
   * '\u001b[32m'
   *
   * > ansi.styles([ 'green', 'underline' ])
   * '\u001b[32;4m'
   */
  ansi.styles = function (effectArray) {
    effectArray = arrayify(effectArray);
    return csi + effectArray.map(function (effect) { return eStyles[effect] }).join(';') + 'm'
  };

  /**
   * A convenience function, applying the provided styles to the input string and then resetting.
   *
   * Inline styling can be applied using the syntax `[style-list]{text to format}`, where `style-list` is a space-separated list of styles from {@link module:ansi-escape-sequences.style ansi.style}. For example `[bold white bg-red]{bold white text on a red background}`.
   *
   * @param {string} - the string to format
   * @param [styleArray] {string[]} - a list of styles to add to the input string
   * @returns {string}
   * @example
   * > ansi.format('what?', 'green')
   * '\u001b[32mwhat?\u001b[0m'
   *
   * > ansi.format('what?', ['green', 'bold'])
   * '\u001b[32;1mwhat?\u001b[0m'
   *
   * > ansi.format('[green bold]{what?}')
   * '\u001b[32;1mwhat?\u001b[0m'
   */
  ansi.format = function (str, styleArray) {
    const re = /\[([\w\s-]+)\]{([^]*?)}/;
    let matches;
    if (!str) return ''

    while (matches = str.match(re)) {
      const inlineStyles = matches[1].split(/\s+/);
      const inlineString = matches[2];
      str = str.replace(matches[0], ansi.format(inlineString, inlineStyles));
    }

    return (styleArray && styleArray.length)
      ? ansi.styles(styleArray) + str + ansi.style.reset
      : str
  };

  /**
   * cursor-related sequences
   */
  ansi.cursor = {
    /**
     * Moves the cursor `lines` cells up. If the cursor is already at the edge of the screen, this has no effect
     * @param [lines=1] {number}
     * @return {string}
     */
    up: function (lines) { return csi + (lines || 1) + 'A' },

    /**
     * Moves the cursor `lines` cells down. If the cursor is already at the edge of the screen, this has no effect
     * @param [lines=1] {number}
     * @return {string}
     */
    down: function (lines) { return csi + (lines || 1) + 'B' },

    /**
     * Moves the cursor `lines` cells forward. If the cursor is already at the edge of the screen, this has no effect
     * @param [lines=1] {number}
     * @return {string}
     */
    forward: function (lines) { return csi + (lines || 1) + 'C' },

    /**
     * Moves the cursor `lines` cells back. If the cursor is already at the edge of the screen, this has no effect
     * @param [lines=1] {number}
     * @return {string}
     */
    back: function (lines) { return csi + (lines || 1) + 'D' },

    /**
     * Moves cursor to beginning of the line n lines down.
     * @param [lines=1] {number}
     * @return {string}
     */
    nextLine: function (lines) { return csi + (lines || 1) + 'E' },

    /**
     * Moves cursor to beginning of the line n lines up.
     * @param [lines=1] {number}
     * @return {string}
     */
    previousLine: function (lines) { return csi + (lines || 1) + 'F' },

    /**
     * Moves the cursor to column n.
     * @param n {number} - column number
     * @return {string}
     */
    horizontalAbsolute: function (n) { return csi + n + 'G' },

    /**
     * Moves the cursor to row n, column m. The values are 1-based, and default to 1 (top left corner) if omitted.
     * @param n {number} - row number
     * @param m {number} - column number
     * @return {string}
     */
    position: function (n, m) { return csi + (n || 1) + ';' + (m || 1) + 'H' },

    /**
     * Hides the cursor
     */
    hide: csi + '?25l',

    /**
     * Shows the cursor
     */
    show: csi + '?25h'
  };

  /**
   * erase sequences
   */
  ansi.erase = {
    /**
     * Clears part of the screen. If n is 0 (or missing), clear from cursor to end of screen. If n is 1, clear from cursor to beginning of the screen. If n is 2, clear entire screen.
     * @param n {number}
     * @return {string}
     */
    display: function (n) { return csi + (n || 0) + 'J' },

    /**
     * Erases part of the line. If n is zero (or missing), clear from cursor to the end of the line. If n is one, clear from cursor to beginning of the line. If n is two, clear entire line. Cursor position does not change.
     * @param n {number}
     * @return {string}
     */
    inLine: function (n) { return csi + (n || 0) + 'K' }
  };

  return ansi;

}));