ruby 关键词

module_define = ["module"]
class_define = ["class"]
method_define = ["def", "undef"]
check_type = ["defined?"]
condition_statement = ["if", "then", "else", "elsif", "case", "when", "unless"]
do_statement = ["for", "in", "while", "until", "next", "break", "do", "redo", "retry", "yield"]
logical_judgement = ["not", "and", "or"]
logical_value = ["true", "false", "nil"]
exception_handle = ["ensure", "rescue"]
object_referrence = ["super", "self"]
block_start_end = ["begin", "end"]
embed_module = ["BEGIN", "END"]
file = ["__FILE__", "__LINE__"]
return_key = ["return"]
alias_key = ["alias"]