asm_grammar

ident:
    /[A-Za-z_.][A-Za-z0-9_.]*/

expr:
    ident |
    expr '+' expr |
    etc.

nl:
    '\' | '\r' | '\n' | EOF

label:
    ident ':'

let:
    '.let' ident '=' expr nl

assign:
    ident '=' expr nl

db:
    '.db' (expr ',')* expr nl

macro:
    ident token* nl

scope:
    '{' line* '}'

line:
    label* (let | assign | macro | scope | nl)

program:
    line*