const path = require('path');

const fs = require('fs');

const require_ = require('./require.js');

/* In this module we are going to extend require()'s support to load '.json'

* files. Specifically we are going to define a function loadJSONFile() that

* reads and parses .json files. Then, we are going to redefine the default

* loader (require_.loader) to call our loadJSONFile().

*

* There are better ways to add support for file types, but we're largely

* doing it in this fashion to get a handle on how to work with

* high-order functions.

*/

/* QUESTION 5 (5pts):

*

* Implement a function that loads the serialized JSON object contained in the

* file at absolute path `resolvedName`. The function should return the parsed

* JSON object and update the require._cache.

*

* You will want to use JSON.parse to actually parse the file contents. If you

* have not done this before, take a look at:

*

* https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/parse

*

* You can think of JSON objects as a format for representing (a subset of)

* literal JavaScript objects as we have seen in class. JSON.parse simply

* turns a string into one such object.

*/

function loadJSONFile(resolvedName) {

/** **/

/** **/

}

exports.loadJSONFile = loadJSONFile;

/* QUESTION 6 (15pts):

*

* Now that we have a function that knows how to handle '.json' files, let's

* put it to work by registering a new loader.

*

* Specifically, let's redefine require_.loader to handle '.json' files. Note

* that the default require_.loader handles '.js' files. We want to allow for

* handling such files, but additionally want to add support for '.json' files.

* In other words, an incorrect solution is one that only handles '.json'

* files, as such:

*

* require_.loader = (resolvedName, nextLoader) => {

* if (path.extname(resolvedName) === '.json') {

* return loadJSONFile(resolvedName);

* } else {

* return nextLoader(resolvedName);

* }

* };

*

* A correct solution should essentially have loaders executing in this order:

*

* if is .json file

* then loadJSONFile

* else

* if .js file

* then loadJSFile

* else fail

*

* For this question you may NOT create additional variables in this module. If

* you need to keep track of any state (hint: the original loader) you can rely

* on the fact that JavaScript functions are first-class closures.

*/

require_.loader = /** **/ undefined; /** **/