git.r.bdr.sh - rbdr/dotfiles/blob

   1 'use strict';
   2
   3 var strCompare = require('../string/#/case-insensitive-compare')
   4   , isObject   = require('./is-object')
   5
   6   , resolve, typeMap;
   7
   8 typeMap = {
   9         undefined: 0,
  10         object: 1,
  11         boolean: 2,
  12         string: 3,
  13         number: 4
  14 };
  15
  16 resolve = function (a) {
  17         if (isObject(a)) {
  18                 if (typeof a.valueOf !== 'function') return NaN;
  19                 a = a.valueOf();
  20                 if (isObject(a)) {
  21                         if (typeof a.toString !== 'function') return NaN;
  22                         a = a.toString();
  23                         if (typeof a !== 'string') return NaN;
  24                 }
  25         }
  26         return a;
  27 };
  28
  29 module.exports = function (a, b) {
  30         if (a === b) return 0; // Same
  31
  32         a = resolve(a);
  33         b = resolve(b);
  34         if (a == b) return typeMap[typeof a] - typeMap[typeof b]; //jslint: ignore
  35         if (a == null) return -1;
  36         if (b == null) return 1;
  37         if ((typeof a === 'string') || (typeof b === 'string')) {
  38                 return strCompare.call(a, b);
  39         }
  40         if ((a !== a) && (b !== b)) return 0; //jslint: ignore
  41         return Number(a) - Number(b);
  42 };