grammar.txt

each line must be a statement

literal_string: " STRING "
literal_number: NUMBER
literal_boolean: TRUE | FALSE
function_literal: FUNCTION parameters? -> block
literal: literal_string | literal_number | literal_boolean | function_literal
identifier: IDENTIFIER

string: literal_string | string_expression | identifier
number: literal_number | number_expression | identifier
boolean: literal_boolean | boolean_expression | identifier
primitive: string | number | boolean | identifier | function_literal | function_call


string_binary_operator: STRING_CONCAT
string_unary_operator:
string_operator: string_binary_operator | string_unary_operator
string_binary_expression: string (string_operator string)*
string_unary_expression: string_unary_operator string
string_expression: string_binary_expression | string_unary_expression

number_binary_operator: PLUS | MINUS | TIMES | OVER | EQUALS | LESSTHAN | GREATERTHAN | NOT | AND | OR | POWER | MOD
number_unary_operator: MINUS
number_operator: number_binary_operator | number_unary_operator
number_binary_expression: number (number_operator number)*
number_unary_expression: number_unary_operator number
number_expression: number_binary_expression | number_unary_expression

boolean_binary_operator: AND | OR
boolean_unary_operator: NOT
boolean_operator: boolean_binary_operator | boolean_unary_operator
boolean_binary_expression: boolean (boolean_operator boolean)*
boolean_unary_expression: boolean_unary_operator boolean
boolean_expression: boolean_binary_expression | boolean_unary_expression

primitive_expression: string_expression | number_expression | boolean_expression

expression:  primitive_expression | function_call | identifier | function_literal
function_call: (identifier | function_literal) (expression (, expression)*)?

error: ERROR expression
print: PRINT expression
assignment: identifier = expression
return: RETURN expression
conditional: expression
block: statement*
while: WHILE conditional block
if: IF conditional block (ELIF conditional block)* (ELSE block)?
for: FOR expression statement block


statement: assignment | if | print | return | while | for | error | function_call



function: parameters? -> block 
parameters: (identifier | number) (, (identifier | number))*