How to use

EMPTY_SOURCE

function

in

Array

function CommonToken(source, type, channel, start, stop) {
  Token.call(this);
  this.source = source !== undefined ? source : CommonToken.EMPTY_SOURCE;
  this.type = type !== undefined ? type : null;
  this.channel = channel !== undefined ? channel : Token.DEFAULT_CHANNEL;
  this.start = start !== undefined ? start : -1;
  this.stop = stop !== undefined ? stop : -1;
  this.tokenIndex = -1;
  if (this.source[0] !== null) {
    this.line = source[0].line;
    this.column = source[0].column;
  } else {
    this.column = -1;
  }
  return this;
}

function CommonToken(source, type, channel, start, stop) {
  Token.call(this);
  this.source = source !== undefined ? source : CommonToken.EMPTY_SOURCE;
  this.type = type !== undefined ? type : null;
  this.channel = channel !== undefined ? channel : Token.DEFAULT_CHANNEL;
  this.start = start !== undefined ? start : -1;
  this.stop = stop !== undefined ? stop : -1;
  this.tokenIndex = -1;
  if (this.source[0] !== null) {
    this.line = source[0].line;
    this.column = source[0].column;
  } else {
    this.column = -1;
  }
  return this;
}