__IGNORE__ = /[ \n\t]*/

CLOSE_PARENTHESE = ')'
EQUALS = '='
OPEN_PARENTHESE = '('

DEF = 'def'
END = 'end'

IDENTIFIER = /[A-Za-z_][A-Za-z_0-9]*/
NUMBER = /\d+(\.\d+)?/
STRING = /'(.*?|\\')'|"(.*?|\\")"/

expression = 

assignment_statement = IDENTIFIER EQUALS expression
function_definition_statement = DEF IDENTIFIER OPEN_PARENTHESE argument_definition_list CLOSE_PARENTHESE statement_list END
expression_statement = expression

statement = assignment_statement | function_definition_statement