# todo: calls (property access and function calls)


<program> ::= <block>

<block> ::= "{" { <statement> } "}"

<statement> ::= <declaration>
              | <assignment>
              | <fn-decl>
              | <if-stmt>
              | <loop-stmt>
              | <while-stmt>
              | <break-stmt>
              | <return-stmt>
              | <expression-statement>


<declaration> ::= "let" <IDENT> "=" <expression> ";"


<assignment> ::= <IDENT> "=" <expression> ";"


<fn-decl> ::= "fn" <IDENT> <fn-args> <block>

<fn-args> ::= "(" { <IDENT> { "," } } ")"


<if-stmt> ::= "if" <expression> <block> { <else-stmt> }

<else-stmt> ::= "else" ( <if-stmt> | <block> )


<loop-stmt> ::= "loop" <block>


<while-stmt> ::= "while" <expression> <block>


<break-stmt> ::= "break" ";"


<return-stmt> ::= "return" { <expression> } ";"


<expression-statement> ::= <expression> ";"


<expression> ::= <logical-or>

<logical-or> ::= <logical-and> { "or" <logical-and> }

<logical-and> ::= <equality> { "and" <equality> }

<equality> ::= <comparison> { ("!=" | "==") <comparison> }

<comparison> ::= <term> { (">" | "<" | ">=" | "<=") <term> }

<term> ::= <factor> { ("-" | "+") <factor> }

<factor> ::= <unary> { ( "*" | "/" | "%" ) <unary> }

<unary> ::= ( "not" | "-" ) <primary>

<primary> ::= <NUMBER>
            | <STRING>
            | <object-literal>
            | <array-literal>
            | "false"
            | "true"
            | "null"

<object-literal> = "{}"

<array-literal> = "[" { <expression> { "," } } "]"