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@sbrl sbrl/Ansi.mjs
Last active Mar 27, 2019

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[Ansi.mjs] VT100 ANSI escape sequence generator in JS. Ported from the C# version.
"use strict";
/**
* Generates various VT100 ANSI escape sequences.
* Ported from C#.
* @licence MPL-2.0 <https://www.mozilla.org/en-US/MPL/2.0/>
* @source https://gist.github.com/a4edd3204a03f4eedb79785751efb0f3#file-ansi-cs
* @author Starbeamrainbowlabs
* GitHub: @sbrl | Twitter: @SBRLabs | Reddit: u/Starbeamrainbowlabs
***** Changelog *****
* 27th March 2019:
* - Initial public release
*/
class Ansi {
constructor() {
/**
* Whether we should *actually* emit ANSI escape codes or not.
* Useful when we want to output to a log file, for example
* @type {Boolean}
*/
this.enabled = true;
this.escape_codes();
}
escape_codes() {
// Solution on how to output ANSI escape codes in C# from here:
// https://www.jerriepelser.com/blog/using-ansi-color-codes-in-net-console-apps
this.reset = this.enabled ? "\u001b[0m" : "";
this.hicol = this.enabled ? "\u001b[1m" : "";
this.locol = this.enabled ? "\u001b[2m" : "";
this.underline = this.enabled ? "\u001b[4m" : "";
this.inverse = this.enabled ? "\u001b[7m" : "";
this.fblack = this.enabled ? "\u001b[30m" : "";
this.fred = this.enabled ? "\u001b[31m" : "";
this.fgreen = this.enabled ? "\u001b[32m" : "";
this.fyellow = this.enabled ? "\u001b[33m" : "";
this.fblue = this.enabled ? "\u001b[34m" : "";
this.fmagenta = this.enabled ? "\u001b[35m" : "";
this.fcyan = this.enabled ? "\u001b[36m" : "";
this.fwhite = this.enabled ? "\u001b[37m" : "";
this.bblack = this.enabled ? "\u001b[40m" : "";
this.bred = this.enabled ? "\u001b[41m" : "";
this.bgreen = this.enabled ? "\u001b[42m" : "";
this.byellow = this.enabled ? "\u001b[43m" : "";
this.bblue = this.enabled ? "\u001b[44m" : "";
this.bmagenta = this.enabled ? "\u001b[45m" : "";
this.bcyan = this.enabled ? "\u001b[46m" : "";
this.bwhite = this.enabled ? "\u001b[47m" : "";
}
// Thanks to http://ascii-table.com/ansi-escape-sequences.php for the following ANSI escape sequences
up(lines = 1) {
return this.enabled ? `\u001b[${lines}A` : "";
}
down(lines = 1) {
return this.enabled ? `\u001b[${lines}B` : "";
}
right(lines = 1) {
return this.enabled ? `\u001b[${lines}C` : "";
}
left(lines = 1) {
return this.enabled ? `\u001b[${lines}D` : "";
}
jump_to(x, y) {
return this.enabled ? `\u001b[${y};${x}H` : "";
}
cursor_pos_save() {
return this.enabled ? `\u001b[s` : "";
}
cursor_pos_restore() {
return this.enabled ? `\u001b[u` : "";
}
}
export default Ansi;
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