braille/index.js

A Node module for converting text to Braille alphabet.

/**
 * braille
 * https://github.com/Nonemoticoner/braille
 *
 * Copyright (c) 2015 Nonemoticoner
 * Licensed under the MIT license.
 */

module.exports = {
	sets: {
		ascii: " A1B\'K2L@CIF/MSP\"E3H9O6R^DJG>NTQ,*5<-U8V.%[$+X!&;:4\\0Z7(_?W]#Y)=",
		dot6:  "⠀⠁⠂⠃⠄⠅⠆⠇⠈⠉⠊⠋⠌⠍⠎⠏⠐⠑⠒⠓⠔⠕⠖⠗⠘⠙⠚⠛⠜⠝⠞⠟⠠⠡⠢⠣⠤⠥⠦⠧⠨⠩⠪⠫⠬⠭⠮⠯⠰⠱⠲⠳⠴⠵⠶⠷⠸⠹⠺⠻⠼⠽⠾⠿"
	},

	// converts character to Braille symbol
	convert: function (character) {
		var sign = undefined;

		// searches sets
		for (var i = this.sets.ascii.length - 1; i >= 0; i--) {
			if(this.sets.ascii[i] == character){
				sign = this.sets.dot6[i];
			}
		}
		
		// if not found will return undefined
		return sign;
	},

	// converts Braille symbol to letter
	read: function (symbol) {
		var letter = undefined;

		// searches sets
		for (var i = this.sets.ascii.length - 1; i >= 0; i--) {
			if(this.sets.dot6[i] == symbol){
				letter = this.sets.ascii[i];
			}
		}
		
		// if not found will return undefined
		return letter;
	},

	// ---------------------------------------

	// converts text to ASCII Braille alphabet
	toBraille: function (text) {
		// make given text uppercase
		var upper = text.toUpperCase(),
			result = "";

		for(var i = 0; i < upper.length; i++) {
			var symbol = this.convert(upper[i]);

			// unsupported letters will be ommited
			if(typeof symbol == "undefined"){
				result += "";
			}
			else{
				result += symbol;
			}
		}

		return result;
	},

	// converts ASCII Braille alphabet to text
	toText: function (code) {
		
		var result = "";

		for(var i = 0; i < code.length; i++) {
			var symbol = this.read(code[i]);

			// unsupported letters will be ommited
			if(typeof symbol == "undefined"){
				result += "";
			}
			else{
				result += symbol;
			}
		}

		return result;
	}
	
};