@dqn/bigbrain

Bigbrain

High-level programming language that can be compiled to Brainfuck.

Installation

$ npm install @dqn/bigbrain

Usage

const bigbrain = require('@dqn/bigbrain');

const code = bigbrain.compile('x = input(); putchar(x);');
console.log(code); // >,<[-]>[<+>>+<-]>[-]<<[>>+<+<-]>[<+>-]>.[-]

CLI

$ npm install -g @dqn/bigbrain

and

$ bigbrain <source-file-path>
# or
$ bigbrain -c "<source-code>"

Example

x = input() * 2;

for (i = 1; i <= x; ++i) {
  if (i % 3 == 0 && i % 5 == 0) {
    putchar(102);
    putchar(105);
    putchar(122);
    putchar(122);
    putchar(98);
    putchar(117);
    putchar(122);
    putchar(122);
    // => fizzbuzz
  } else if (i % 3 == 0) {
    putchar(102);
    putchar(105);
    putchar(122);
    putchar(122);
    // => fizz
  } else if (i % 5 == 0) {
    putchar(98);
    putchar(117);
    putchar(122);
    putchar(122);
    // => buzz
  } else {
    print(i);
    // => (raw number)
  }
  putchar(10);
  // => \n
}

Output:

>>,>++<[>[>+>+<<-]>>[<<+>>-]<<<-]>[-]>[<<+>>-]<<<<[-]>>[<<+>>>+<-]>...

Syntax

variable

// initialize variable
foo = 10;
bar = 20;

input

// input returns integer
x = input();

print

// print value as decimal
print(10); // => 10

putchar

// print value as character
putchar(65); // => A

block

// block is an expression
x = { 12 };

y = {
  print(10);
  putchar(65);

  // if there is no semicolon, the value is returned
  20 + 15 + 7
};

print(y); // => 42

if-else

The body must be a block.

x = 20;

// if only
if (x > 10) {
  print(65);
}

// if-else
if (x > 10) {
  print(65);
} else {
  print(66);
}

// if-else, if...
if (x > 10) {
  print(65);
} else if (x < 10) {
  print(66);
} else {
  print(67);
}

// if-else is an expression
y = if (x > 10) {
  1
} else {
  2
};

print(y); // => 1

for

The body must be a block.

for (i = 0; i < 10; i++) {
  print(i % 3);
}

operators

Support for basic operators.

print(1 + +1); // => 2
print(1 + -1); // => 0
print(1 + 2); // => 3
print(4 - 1); // => 3
print(2 * 4); // => 8
print(2 ** 3); // => 8
print(13 / 3); // => 4
print(13 % 3); // => 1
print(2 * (3 + 4)); // => 14
print(!0); // => 1
print(1 == 2); // => 0
print(1 != 2); // => 1
print(1 < 2); // => 1
print(1 > 2); // => 0
print(1 <= 1); // => 1
print(1 >= 1); // => 1
print(1 && 0); // => 0
print(1 || 0); // => 1

x = 5;
print(++x); // => 6
print(x++); // => 6
print(x--); // => 7
print(--x); // => 5

License

MIT