numbers.js

   1
   2 var Parser = require("./parser");
   3
   4 var array_ = Array.prototype;
   5
   6 module.exports = parseNumber;
   7 function parseNumber(callback, options) {
   8     return parseDigits(function (digits) {
   9         if (digits) {
  10             return parseConvert(callback, digits.join(""), options);
  11         } else {
  12             return callback();
  13         }
  14     });
  15 }
  16
  17 var digits = "0123456789";
  18 var parseDigit = function (callback) {
  19     return function (character) {
  20         if (character !== "" && digits.indexOf(character) !== -1) {
  21             return callback(character);
  22         } else {
  23             return callback()(character);
  24         }
  25     };
  26 };
  27
  28 function parseConvert(callback, number, options) {
  29     return Parser.countPrimes(function (primes) {
  30         return callback(convert(number, primes, options));
  31     });
  32 }
  33
  34 function convert(string, alt, options) {
  35     var error;
  36     var radix;
  37     var duodecimal = options.duodecimal;
  38     var font = options.font;
  39     var makeColumn = font.makeColumn;
  40     if (alt == 0) {
  41         radix = duodecimal ? 12 : 10;
  42     } else {
  43         radix = duodecimal ? 10 : 12;
  44         error = alt > 1;
  45     }
  46     var number = parseInt(string, 10);
  47     var string = number.toString(radix).split("");
  48     return string.map(function (character) {
  49         var column = makeColumn(""+parseInt(character, 12));
  50         if (error) {
  51             column.addError("Numbers can only be parsed in either decimal or dudecimal.");
  52         }
  53         return column;
  54     });
  55 }
  56
  57 var parseDigits = Parser.makeParseSome(parseDigit);
  58