ext-unpacker.js

// ext-unpacker.js

exports.setExtUnpackers = setExtUnpackers;

var Bufferish = require("./bufferish");
var Buffer = Bufferish.global;
var _decode;

var ERROR_COLUMNS = {name: 1, message: 1, stack: 1, columnNumber: 1, fileName: 1, lineNumber: 1};

function setExtUnpackers(codec) {
  codec.addExtUnpacker(0x0E, [decode, unpackError(Error)]);
  codec.addExtUnpacker(0x01, [decode, unpackError(EvalError)]);
  codec.addExtUnpacker(0x02, [decode, unpackError(RangeError)]);
  codec.addExtUnpacker(0x03, [decode, unpackError(ReferenceError)]);
  codec.addExtUnpacker(0x04, [decode, unpackError(SyntaxError)]);
  codec.addExtUnpacker(0x05, [decode, unpackError(TypeError)]);
  codec.addExtUnpacker(0x06, [decode, unpackError(URIError)]);

  codec.addExtUnpacker(0x0A, [decode, unpackRegExp]);
  codec.addExtUnpacker(0x0B, [decode, unpackClass(Boolean)]);
  codec.addExtUnpacker(0x0C, [decode, unpackClass(String)]);
  codec.addExtUnpacker(0x0D, [decode, unpackClass(Date)]);
  codec.addExtUnpacker(0x0F, [decode, unpackClass(Number)]);

  if ("undefined" !== typeof Uint8Array) {
    codec.addExtUnpacker(0x11, unpackClass(Int8Array));
    codec.addExtUnpacker(0x12, unpackClass(Uint8Array));
    codec.addExtUnpacker(0x13, [unpackArrayBuffer, unpackClass(Int16Array)]);
    codec.addExtUnpacker(0x14, [unpackArrayBuffer, unpackClass(Uint16Array)]);
    codec.addExtUnpacker(0x15, [unpackArrayBuffer, unpackClass(Int32Array)]);
    codec.addExtUnpacker(0x16, [unpackArrayBuffer, unpackClass(Uint32Array)]);
    codec.addExtUnpacker(0x17, [unpackArrayBuffer, unpackClass(Float32Array)]);

    // PhantomJS/1.9.7 doesn't have Float64Array
    if ("undefined" !== typeof Float64Array) {
      codec.addExtUnpacker(0x18, [unpackArrayBuffer, unpackClass(Float64Array)]);
    }

    // IE10 doesn't have Uint8ClampedArray
    if ("undefined" !== typeof Uint8ClampedArray) {
      codec.addExtUnpacker(0x19, unpackClass(Uint8ClampedArray));
    }

    codec.addExtUnpacker(0x1A, unpackArrayBuffer);
    codec.addExtUnpacker(0x1D, [unpackArrayBuffer, unpackClass(DataView)]);
  }

  if (Bufferish.hasBuffer) {
    codec.addExtUnpacker(0x1B, unpackClass(Buffer));
  }
}

function decode(input) {
  if (!_decode) _decode = require("./decode").decode; // lazy load
  return _decode(input);
}

function unpackRegExp(value) {
  return RegExp.apply(null, value);
}

function unpackError(Class) {
  return function(value) {
    var out = new Class();
    for (var key in ERROR_COLUMNS) {
      out[key] = value[key];
    }
    return out;
  };
}

function unpackClass(Class) {
  return function(value) {
    return new Class(value);
  };
}

function unpackArrayBuffer(value) {
  return (new Uint8Array(value)).buffer;
}