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// SPDX-FileCopyrightText: 2024 Himbeer <himbeer@disroot.org>
//
// SPDX-License-Identifier: CC-BY-NC-SA-4.0
root -> toplevel*
toplevel -> function
function -> "func" IDENTIFIER "(" param? ")" IDENTIFIER block
param -> IDENTIFIER IDENTIFIER ( "," param )?
block -> "{" ( statement )* "}"
statement -> ( return ) ";"
return -> "return" expression
expression -> equality
equality -> comparison ( ( "==" | "!=" ) comparison )*
comparison -> term ( ( "<" | "<=" | ">" | ">=" ) term )?
term -> numeral ( ( "<<" | ">>" ) numeral )*
numeral -> factor ( ( "+" | "-" ) factor )*
factor -> unary ( ( "*" | "/" ) unary )*
unary -> ( "-" | "!" | "~" )? primary
primary -> grouping | literal | call
grouping -> "(" expression ")"
literal -> string | number
string -> STRING*
number -> NUMBER IDENTIFIER
call -> IDENTIFIER "(" arg? ")"
arg -> expression ( "," arg )?
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