Lunita

A little programming language based upon a subset of Lua.

The subset supported is sufficient to run the following program, considered important for interviews:

function anagramas(c1, c2)
    if string.len(c1) ~= string.len(c2) then
        return false
    end

    local tabla1 = {}
    for i=1, string.len(c1) do
        tabla1[i] = string.byte(c1, i)
    end
    table.sort(tabla1)

    local tabla2 = {}
    for i=1, string.len(c2) do
        tabla2[i] = string.byte(c2, i)
    end
    table.sort(tabla2)

    for i=1, string.len(c1) do
        if tabla1[i] ~= tabla2[i] then
            return false
        end
    end

    return true
end

Syntax

program    -> statement*
statement  -> assignment | expression | ifthen | forloop | function | return
assignment -> "local"? identifier "=" expression
expression -> call | value | binaryop | index
call       -> (identifier ".")? identifier "(" (expression ",")* expression? ")"
ifthen     -> "if" expression "then" statement "end"
binaryop   -> expression "~=" expression
index      -> identifier "[" expression "]"
forloop    -> "for" assignment "," expression "do" statement* "end"
function   -> "function" identifier "(" (identifier ",")* identifier? ")" statement* "end"
return     -> "return" expression
value      -> number | string | identifier | "true" | "false" | "{}"
number     -> [0-9]+
string     -> "\"" .* "\""
identifier -> [A-Za-z]+

Other

Here are the slides for my talk Cómo crear un intérprete en 25 minutos o menos at BoyaConf, 2024.

Colophon

The lunita logo was made by a souless ai.