Ushio-cn-old/yimian/iot/mqtt/smartfarm/node_modules/msgpack-lite/lib/codec-base.js

// codec-base.js

var IS_ARRAY = require("isarray");

exports.createCodec = createCodec;
exports.install = install;
exports.filter = filter;

var Bufferish = require("./bufferish");

function Codec(options) {
  if (!(this instanceof Codec)) return new Codec(options);
  this.options = options;
  this.init();
}

Codec.prototype.init = function() {
  var options = this.options;

  if (options && options.uint8array) {
    this.bufferish = Bufferish.Uint8Array;
  }

  return this;
};

function install(props) {
  for (var key in props) {
    Codec.prototype[key] = add(Codec.prototype[key], props[key]);
  }
}

function add(a, b) {
  return (a && b) ? ab : (a || b);

  function ab() {
    a.apply(this, arguments);
    return b.apply(this, arguments);
  }
}

function join(filters) {
  filters = filters.slice();

  return function(value) {
    return filters.reduce(iterator, value);
  };

  function iterator(value, filter) {
    return filter(value);
  }
}

function filter(filter) {
  return IS_ARRAY(filter) ? join(filter) : filter;
}

// @public
// msgpack.createCodec()

function createCodec(options) {
  return new Codec(options);
}

// default shared codec

exports.preset = createCodec({preset: true});