Ggg programming language & interpreter

Ggg is programming language built on top of brainfuck, which is built on top of P′′ programming language. It's very simple with just a few constructs and symbols. Main reason of creation of this language is extending of brainfuck with some quite needed features.

Valid symbols: Symbols in tokens: G, g, other characters are used to break sets of symbols into tokens.

In Ggg version g there are 8 basic commands which are also only valid tokens, based on those from brainfuck:

G as + (increment byte)

g as - (decrement byte)

gG as > (increment pointer, go right)

Gg as < (decrement pointer, go left)

gg as [ (if data byte zero, jump to forward GG)

GG as ] (if data byte nonzero, jump backward to gg)

GGG as . (output byte)

ggg as , (input byte)

Commands should be divided by other characters or whitespace (including line feed). Minimal requirement for the compilable program:

• there is either gg and GG in order, either there are none of those commands in the code. There is no need for having a parity of those tokens, only the order and having at least one gg and GG is needed. Programs breaking this rule would not compile. Not adhering to the rule results with syntax error.
• there are no symbols containing g and G without other characters that are also not a command. So in Ggg g the symbol gGg is illegal and creates compilation error, similar situation is with longer chains of gs and Gs, like gggg. Not adhering to the rule results with lexical error.

Ggg is extensible, so there is possibility to add more commands, like declaring constants. Proposed additional functionalities:

• Integer literals
• Simple macros
• Different I/O functions

Ggg G integer literals known as g-binary Literals are created using symbols g and G as one word without any other characters inbetween. G symbol means g-binary 1 and g symbol means g-binary 0. Scheme for creating integer g-binary literal: g-binary-command address g-binary-value Both address and g-binary-value can contain any number of (reasonable) values, including not paired gg and GG.