gistfile1.js

(function() {
  // Class for template value placeholder objects
  var _Value = Class.create({
    toString: function() {
      // "x==null" is true for catches null and undefined
      return this.value == null ? '' : this.value.toString();
    }
  });

  /**
   * @class ZenTemplate
   */
  window.ZenTemplate = Class.create({
    /**
     * @constructor
     */
    initialize: function(s) {
      this.klass = 'ZenTemplate';
      var parts = this.parts = [];
      var vals = this.values = {};

      // Compile the template
      var RE = /^(.*?)#\{(.+?)\}(.*)/;
      while (s) {
        var m = RE.exec(s);
        if (!m) break;
        if (m[1]) parts.push(m[1]);
        var k = m[2];
        if (k) parts.push(vals[k] = (vals[k] || new _Value()));
        s = m[3];
      }
      if (s) parts.push(s);
    },

    /**
     * @function ?
     */
    evaluate: function(o) {
      var vals = this.values;
      for (var k in vals) vals[k].value = o[k];
      return this.parts.join('');
    }
  });

  // The "store"
  var _instances = {};

  /**
   * Factory method for getting a template object.  Templates are compiled and
   * cached
   * @function {static} ?
   */
  window.ZenTemplate.get = function(s) {
    if (s.klass && s.klass == 'ZenTemplate') return s;
    return _instances[s] || (_instances[s] = new ZenTemplate(s));
  };
})();