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