在step句子中, 所有的參數默認是string類型, 如果用戶想使用復雜的或者其他數據類型, 就需要了解以下bahave中的數據類型.
behave的數據類型轉換器是在parse和cfparse中支持.
parse模塊是string.format的逆函數.? parse_type是基于parse的擴展, 簡化了自定義數據類型的產生.
parse feature
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- 在類型轉換器中可選pattern
- 函數描述符with_pattern()
parse_type feature
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- 簡化類型轉換器的生成
- 基于cardinality創建類型轉換器
- 提供擴展的解析器支持cardinality field
Cardinality Example Description 0..1 “{person:Person?}” Zero or one: For optional parts. 0..* “{persons:Person*}” Zero or more: For list<T> (many0). 1..* “{persons:Person+}” One or more: For list<T> (many).
如何定義自定義數據類型
- 用戶注冊一個數據類型, 例如在environment.py文件中
- parse.Parse匹配string作為一個數據類型, 然后它調用類型轉換器去轉換匹配的文本為目標數據類型
#普通的類型轉換 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)#帶有正則的類型轉換 @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中預定義的數據類型
http://jenisys.github.io/behave.example/datatype/builtin_types.html
Cardinality 0 or 1(optional)
#這個實現比上一個實現多了一步 TypeBuilder.with_optional(parse_word_a). from behave import register_type from parse_type import TypeBuilder import 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_}是一個可選項, 在step既可以有"a "也可以沒有 @when('attacked by {:optional_a_}{opponent}') def step_attacked_by(context, a_, opponent):context.ninja_fight.opponent = opponent
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Cardinality 1++
from behave import register_type from 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)
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Cardinality 0++
from behave import register_type from parse_type import TypeBuilderdef slurp_space(text):return text slurp_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)
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