Hand challenge

This is my solution to the hand challenge from jesus-seijas-sp.

The file original-solution.js contains the solution from the original author. All the input files have also been created by the original author. The rest of the code was created by me.

Below these lines is the original description of the problem to solve.

Usage

You will need Node.js to launch the CLI, either with direct input or loading a instructions file:

$ cd [project-folder]
$ node ./hli-cli.js -f test1.hand
Hello
$ node ./hli-cli.js 🤜👇👇👇👇👇👇👇👉👆👈🤛👉👇👊👇🤜👇👉👆👆👆👆👆👈🤛👉👆👆👊👆👆👆👆👆👆👆👊👊👆👆👆👊
Hello

Testing

I implemented a simple testing engine. You can add new test files to the tests fonder and assert the output adding new lines at the end of the tests/run-tests.js like this:

testFile('Shoud output "Your expected output"', 'new-test-input.hand', 'Your expected output');

To run the tests simply execute:

$ cd [project-folder]
$ node .\tests\tests.js
Test Shoud output "Hello": Success!
Test Shoud output "Hello World!": Success!

Introduction

You find a strange mirror that always shows a hand that is moving. The hand appears to be alive, and after a lot of questions of "yes" and "no" answer, you know that the hand is trying to teach you a program that is written in HPL (Hand Programming Language).

This language works with a memory of an indefinite size of bytes, with all values initialized to 0. This language haves 7 instructions:

👉 : moves the memory pointer to the next cell

👈 : moves the memory pointer to the previous cell

👆 : increment the memory cell at the current position

👇 : decreases the memory cell at the current position.

🤜 : if the memory cell at the current position is 0, jump just after the corresponding 🤛

🤛 : if the memory cell at the current position is not 0, jump just after the corresponding 🤜

👊 : Display the current character represented by the ASCII code defined by the current position.

Notes:

As memory cells are bytes, from 0 to 255 value, if you decrease 0 you'll get 255, if you increment 255 you'll get 0.
Loops of 🤜 and 🤛 can be nested.

Tests

The hand shows you two small programs and their outputs:

This program display "Hello"

👇🤜👇👇👇👇👇👇👇👉👆👈🤛👉👇👊👇🤜👇👉👆👆👆👆👆👈🤛👉👆👆👊👆👆👆👆👆👆👆👊👊👆👆👆👊

This program (with nested loops) display "Hello World!"

👉👆👆👆👆👆👆👆👆🤜👇👈👆👆👆👆👆👆👆👆👆👉🤛👈👊👉👉👆👉👇🤜👆🤛👆👆👉👆👆👉👆👆👆🤜👉🤜👇👉👆👆👆👈👈👆👆👆👉🤛👈👈🤛👉👇👇👇👇👇👊👉👇👉👆👆👆👊👊👆👆👆👊👉👇👊👈👈👆🤜👉🤜👆👉👆🤛👉👉🤛👈👇👇👇👇👇👇👇👇👇👇👇👇👇👇👊👉👉👊👆👆👆👊👇👇👇👇👇👇👊👇👇👇👇👇👇👇👇👊👉👆👊👉👆👊

Challenge

The file "input.hand" is the code of the program

Good luck!

alvarovazquez/hand-challenge