docs: function parse_interpol(value) {
      var items = [],
          pos = 0,
          next = 0,
          match;
      while (true) {
        // Match up to embedded string
        next = value.substr(pos).search(embedder);
        if (next < 0) {
          if (pos < value.length) {
            items.push(JSON.stringify(value.substr(pos)));
          }
          break;
        }
        items.push(JSON.stringify(value.substr(pos, next)));
        pos += next;
  
        // Match embedded string
        match = value.substr(pos).match(embedder);
        next = match[0].length;
        if (next < 0) { break; }
        items.push(match[1] || match[2]);
        pos += next;
      }
      return items.filter(function (part) { return part && part.length > 0}).join(" +\n");
    }