module Parser module Expression include Parslet rule(:value_expression) { call_site | basic_type } rule(:expression) { (simple_return | while_do | conditional | operator_expression | call_site ) >> newline } def delimited_expressions( delimit ) ( (delimit.absent? >> expression).repeat(1)).as(:expressions) >> delimit end rule(:expressions_do) { delimited_expressions(keyword_do) } rule(:expressions_else) { delimited_expressions(keyword_else) } rule(:expressions_end) { delimited_expressions(keyword_end) } end end