在step句子中, 所有的参数默认是string类型, 如果用户想使用复杂的或者其他数据类型, 就需要了解以下bahave中的数据类型.
behave的数据类型转换器是在parse和cfparse中支持.
parse模块是string.format的逆函数. parse_type是基于parse的扩展, 简化了自定义数据类型的产生.
parse feature
在类型转换器中可选pattern函数描述符with_pattern()
parse_type feature
简化类型转换器的生成基于cardinality创建类型转换器提供扩展的解析器支持cardinality field
如何定义自定义数据类型
用户注册一个数据类型, 例如在environment.py文件中parse.Parse匹配string作为一个数据类型, 然后它调用类型转换器去转换匹配的文本为目标数据类型#普通的类型转换from behave import register_typedef parse_number(text):"""Convert parsed text into a number.:param text: Parsed text, called by :py:meth:`parse.Parser.parse()`.:return: Number instance (integer), created from parsed text."""return int(text)# -- REGISTER: User-defined type converter (parse_type).register_type(Number=parse_number)#带有正则的类型转换@parse.with_pattern(r"a\s+")def parse_word_a(text):"""Type converter for "a " (followed by one/more spaces)."""return text.strip()register_type(a_=parse_word_a)
parse中预定义的数据类型
http://jenisys.github.io/behave.example/datatype/builtin_types.html
Cardinality 0 or 1(optional)
#这个实现比上一个实现多了一步 TypeBuilder.with_optional(parse_word_a).from behave import register_typefrom parse_type import TypeBuilderimport parse@parse.with_pattern(r"a\s+")def parse_word_a(text):"""Type converter for "a " (followed by one/more spaces)."""return text.strip()# -- SAME:# parse_optional_word_a = TypeBuilder.with_zero_or_one(parse_word_a)parse_optional_word_a = TypeBuilder.with_optional(parse_word_a)register_type(optional_a_=parse_optional_word_a)#step_impl中{:optional_a_}是一个可选项, 在step既可以有"a "也可以没有@when('attacked by {:optional_a_}{opponent}')def step_attacked_by(context, a_, opponent):context.ninja_fight.opponent = opponent
Cardinality 1++
from behave import register_typefrom parse_type import TypeBuildercompany_persons = [ "Alice", "Bob", "Charly", "Dodo" ]parse_person = TypeBuilder.make_choice(company_persons)register_type(Person=parse_person)# -- MANY-TYPE: Persons := list<Person> with list-separator = "and"# parse_persons = TypeBuilder.with_one_or_more(parse_person, listsep="and")parse_persons = TypeBuilder.with_many(parse_person, listsep="and")register_type(PersonAndMore=parse_persons)# -- NEEDED-UNTIL: parse_type.cfparse.Parser is used by behave.# parse_persons2 = TypeBuilder.with_many(parse_person)# type_dict = {"Person+": parse_persons2}# register_type(**type_dict)
Cardinality 0++
from behave import register_typefrom parse_type import TypeBuilderdef slurp_space(text):return textslurp_space.pattern = r"\s*"register_type(slurp_space=slurp_space)parse_color = TypeBuilder.make_choice([ "red", "green", "blue", "yellow" ])register_type(Color=parse_color)# -- MANY-TYPE: Persons := list<Person> with list-separator = "and"# parse_colors = TypeBuilder.with_many0(parse_color, listsep="and")parse_colors0A= TypeBuilder.with_zero_or_more(parse_color, listsep="and")register_type(OptionalColorAndMore=parse_colors0A)
