babel-core/lib/acorn/src/lookahead.js

Turn ES6 code into readable vanilla ES5 with source maps

"use strict";

var Parser = require("./state").Parser;

var pp = Parser.prototype;

var STATE_KEYS = ["lastTokStartLoc", "lastTokEndLoc", "lastTokStart", "lastTokEnd", "lineStart", "startLoc", "endLoc", "start", "pos", "end", "type", "value"];

pp.getState = function () {
  var state = {};
  for (var i = 0; i < STATE_KEYS.length; i++) {
    var key = STATE_KEYS[i];
    state[key] = this[key];
  }
  return state;
};

pp.lookahead = function () {
  var old = this.getState();
  this.next();
  var curr = this.getState();
  for (var key in old) this[key] = old[key];
  return curr;
};