self-reload-json/lib/walkthroughtree.js

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.walkThroughTree = walkThroughTree;
exports.walkThroughTreeGen = walkThroughTreeGen;
function walkThroughTree(fn, options, ...args) {
  options = options || {};
  let first = true,
      result;
  for (const current of walkThroughTreeGen(fn, options, ...args)) if (first || !options.firstResult) {
    result = current;
    first = false;
  }
  return result;
}

function* walkThroughTreeGen(fn, options, ...args) {
  options = options || {};
  const dequeue = Array.prototype[options.horizontal ? 'shift' : 'pop'];
  const tokens = [args],
        nextTokens = [];
  const scope = {
    next(...args) {
      nextTokens.push(args);
    }
  };
  while (tokens.length) {
    yield fn.apply(scope, dequeue.call(tokens));
    if (nextTokens.length) {
      Array.prototype.push.apply(tokens, nextTokens);
      nextTokens.length = 0;
    }
  }
}