@vuept/loopback-connector-mssql/node_modules/tedious/lib/token/token-stream-parser.js

Microsoft SQL Server connector for LoopBack

'use strict';

var _getPrototypeOf = require('babel-runtime/core-js/object/get-prototype-of');

var _getPrototypeOf2 = _interopRequireDefault(_getPrototypeOf);

var _classCallCheck2 = require('babel-runtime/helpers/classCallCheck');

var _classCallCheck3 = _interopRequireDefault(_classCallCheck2);

var _createClass2 = require('babel-runtime/helpers/createClass');

var _createClass3 = _interopRequireDefault(_createClass2);

var _possibleConstructorReturn2 = require('babel-runtime/helpers/possibleConstructorReturn');

var _possibleConstructorReturn3 = _interopRequireDefault(_possibleConstructorReturn2);

var _inherits2 = require('babel-runtime/helpers/inherits');

var _inherits3 = _interopRequireDefault(_inherits2);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var EventEmitter = require('events').EventEmitter;
var StreamParser = require('./stream-parser');

/*
  Buffers are thrown at the parser (by calling addBuffer).
  Tokens are parsed from the buffer until there are no more tokens in
  the buffer, or there is just a partial token left.
  If there is a partial token left over, then it is kept until another
  buffer is added, which should contain the remainder of the partial
  token, along with (perhaps) more tokens.
  The partial token and the new buffer are concatenated, and the token
  parsing resumes.
 */

var Parser = function (_EventEmitter) {
  (0, _inherits3.default)(Parser, _EventEmitter);

  function Parser(debug, colMetadata, options) {
    (0, _classCallCheck3.default)(this, Parser);

    var _this = (0, _possibleConstructorReturn3.default)(this, (Parser.__proto__ || (0, _getPrototypeOf2.default)(Parser)).call(this));

    _this.debug = debug;
    _this.colMetadata = _this.colMetadata;
    _this.options = options;

    _this.parser = new StreamParser(_this.debug, _this.colMetadata, _this.options);
    _this.parser.on('data', function (token) {
      if (token.event) {
        _this.emit(token.event, token);
      }
    });
    _this.parser.on('drain', function () {
      _this.emit('drain');
    });
    return _this;
  }

  // Returns false to apply backpressure.


  (0, _createClass3.default)(Parser, [{
    key: 'addBuffer',
    value: function addBuffer(buffer) {
      return this.parser.write(buffer);
    }

    // Writes an end-of-message (EOM) marker into the parser transform input
    // queue. StreamParser will emit a 'data' event with an 'endOfMessage'
    // pseudo token when the EOM marker has passed through the transform stream.
    // Returns false to apply backpressure.

  }, {
    key: 'addEndOfMessageMarker',
    value: function addEndOfMessageMarker() {
      return this.parser.write(this.parser.endOfMessageMarker);
    }
  }, {
    key: 'isEnd',
    value: function isEnd() {
      return this.parser.buffer.length === this.parser.position;
    }

    // Temporarily suspends the token stream parser transform from emitting events.

  }, {
    key: 'pause',
    value: function pause() {
      this.parser.pause();
    }

    // Resumes the token stream parser transform.

  }, {
    key: 'resume',
    value: function resume() {
      this.parser.resume();
    }
  }]);
  return Parser;
}(EventEmitter);

module.exports.Parser = Parser;