Luna Docs

Grammar

The grammar of Luna is very closue to modern languages like JavaScript and Rust

Atomic Tokens

The following is a list of atomic tokens and what their regex is:

name regex
null /null/
ident /[a-zA-Z_]([a-zA-Z_0-9]*)/
int /[0-9]+/
float /[0-9]+\./, /[0-9]+\.[0-9]+/
bool /true/, /false/
char /'\.'/
string /"[^"]*"/

Keywords

The following is a list of reserved keywords:

keyword description
let local variable definitions
fn function definitions
if conditional branches
else else conditional branches of if statements
match match statement
while while loops
for for loops
in iterate over something in a for loop statement
return return from a call
break break out of a loop
continue skip to next iteration of a loop
null represents the null value
true represents the boolean value true
false represents the boolean value false

Symbols

The following is a list of reserved keywords:

symbol name
= equal
, comma
. dot
: colon
! exclamation
( paran left
) paran right
[ bracket left
] bracket right
{ brace left
} brace right
+ plus
- minus
* star
/ slash
% percent
^ exponent
+= plus equal
-= minus equal
*= star equal
/= slash equal
%= percent equal
^= exponent equal
== equal equal
!= exclamation equal
< less
> greater
<= less equal
>= greater equal
& ampersand
| pipe

Syntax Sugar

Luna has the same design philosophy as Lua. What that means is that certain syntax is only another way to write the same thing:

fn add(a, b) {
    return a + b
}

translates to

add = fn(a, b) {
    return a + b
}