Acme.BookStore.HttpApi.Host/node_modules/resolve-options/index.js

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'use strict';

var normalize = require('value-or-function');

var slice = Array.prototype.slice;

function createResolver(config, options) {
  // TODO: should the config object be validated?
  config = config || {};
  options = options || {};

  var resolver = {
    resolve: resolve,
  };


  // Keep constants separately
  var constants = {};

  function resolveConstant(key) {
    if (constants.hasOwnProperty(key)) {
      return constants[key];
    }

    var definition = config[key];
    // Ignore options that are not defined
    if (!definition) {
      return;
    }

    var option = options[key];

    if (option != null) {
      if (typeof option === 'function') {
        return;
      }
      option = normalize.call(resolver, definition.type, option);
      if (option != null) {
        constants[key] = option;
        return option;
      }
    }

    var fallback = definition.default;
    if (option == null && typeof fallback !== 'function') {
      constants[key] = fallback;
      return fallback;
    }
  }


  // Keep requested keys to detect (and disallow) recursive resolution
  var stack = [];

  function resolve(key) {
    var option = resolveConstant(key);
    if (option != null) {
      return option;
    }