Waddle_Language/grammar/operations/control_flow.bnf

<statement> ::= <assignment_statement>
              | <if_statement>
              | <while_statement>
              | <loop_statement>
              | <reverse_loop_statement>
              | <function_call_statement>
              | <return_statement>
              | <using_statement>
              | <attempt_statement>
              | <fail_statement>

<assignment_statement> ::= <my_identifier> ".set(" <expression> ")" ";"

<if_statement> ::= "if" "(" <boolean_expression> ")" 
    "{" <statement>* "}" 
    ["orif" "(" <boolean_expression> ")" "{" <statement>* "}"]?
    ["otherwise" "{" <statement>* "}"]?

<while_statement> ::= "while" "(" <expression> ")" 
    "{" <statement>* "}"

<loop_statement> ::= "loop" "(" <identifier> "," <expression> "->" <expression> 
    ["," <expression>]? ")" 
    "{" <statement>* "}"

<reverse_loop_statement> ::= "rloop" "(" <identifier> "," <expression> "->" <expression> 
    ["," <expression>]? ")" 
    "{" <statement>* "}"

<function_call_statement> ::= <my_identifier> "(" <argument_list>? ")" ";"

<return_statement> ::= "rtn" <expression> ";"

<using_statement> ::= "using" <type> <identifier> ".set(" <expression> ")" 
    "{" <statement>* "}"

<attempt_statement> ::= <expression> ".attempt" "{" <attempt_handler>* "}"

<attempt_handler> ::= ("ok" | <identifier> | "error") "{" <statement>* "}"

<fail_statement> ::= <my_identifier> ".fail(" <error_type> ["(" <argument_list>? ")"]? ")" ";"