es5-ext/string/format-method.js

   1 'use strict';
   2
   3 var isCallable = require('../object/is-callable')
   4   , value      = require('../object/valid-value')
   5
   6   , call = Function.prototype.call;
   7
   8 module.exports = function (fmap) {
   9         fmap = Object(value(fmap));
  10         return function (pattern) {
  11                 var context = value(this);
  12                 pattern = String(pattern);
  13                 return pattern.replace(/%([a-zA-Z]+)|\\([\u0000-\uffff])/g,
  14                         function (match, token, escape) {
  15                                 var t, r;
  16                                 if (escape) return escape;
  17                                 t = token;
  18                                 while (t && !(r = fmap[t])) t = t.slice(0, -1);
  19                                 if (!r) return match;
  20                                 if (isCallable(r)) r = call.call(r, context);
  21                                 return r + token.slice(t.length);
  22                         });
  23         };
  24 };