tedious/lib/token/token-stream-parser.js

A TDS driver, for connecting to MS SQLServer databases.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.Parser = void 0;
var _events = require("events");
var _streamParser = _interopRequireDefault(require("./stream-parser"));
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
/**
 * Parses the tokens of a message and dispatches them to a `TokenHandler`.
 *
 * Emits `'end'` once all tokens were handled, or `'error'` if parsing or
 * handling a token failed.
 */
class Parser extends _events.EventEmitter {
  constructor(message, debug, handler, options) {
    super();
    this.debug = debug;
    this.options = options;
    this.paused = false;
    this.onResume = undefined;

    // Emit outside of the promise chain, so an exception thrown by a listener
    // is an uncaught exception (like on master), not an unhandled rejection.
    this.run(message, handler).then(() => {
      process.nextTick(() => this.emit('end'));
    }, error => {
      process.nextTick(() => this.emit('error', error));
    });
  }
  async run(message, handler) {
    const parser = new _streamParser.default(this.options);

    // Iterate manually - unlike `for await`, this does not destroy the message
    // if parsing fails.
    const iterator = Symbol.asyncIterator in message ? message[Symbol.asyncIterator]() : message[Symbol.iterator]();
    let result;
    while (!(result = await iterator.next()).done) {
      parser.write(result.value);
      while (true) {
        while (this.paused) {
          await new Promise(resolve => {
            this.onResume = resolve;
          });
        }
        const token = parser.read();
        if (token === undefined) {
          break;
        }
        this.debug.token(token);
        handler[token.handlerName](token);
      }
    }
    parser.end();
  }
  pause() {
    this.paused = true;
  }
  resume() {
    this.paused = false;
    const onResume = this.onResume;
    this.onResume = undefined;
    onResume?.();
  }
}
exports.Parser = Parser;
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