在 ruby 中将驼峰大小写转换为下划线大小写
-
19-09-2019 - |
题
是否有任何现成的函数可以将驼峰式大小写字符串转换为下划线分隔的字符串?
我想要这样的东西:
"CamelCaseString".to_underscore
返回“camel_case_string”。
...
解决方案
Rails的的ActiveSupport 增加了使用以下强调的字符串:
class String
def underscore
self.gsub(/::/, '/').
gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').
gsub(/([a-z\d])([A-Z])/,'\1_\2').
tr("-", "_").
downcase
end
end
然后,你可以做有趣的事情:
"CamelCase".underscore
=> "camel_case"
其他提示
可以使用
"CamelCasedName".tableize.singularize
或者只是
"CamelCasedName".underscore
这两个选项的方式将产生"camel_cased_name"
。您可以查看详细信息,它这里。
一衬垫Ruby实现:
class String
# ruby mutation methods have the expectation to return self if a mutation occurred, nil otherwise. (see http://www.ruby-doc.org/core-1.9.3/String.html#method-i-gsub-21)
def to_underscore!
gsub!(/(.)([A-Z])/,'\1_\2')
downcase!
end
def to_underscore
dup.tap { |s| s.to_underscore! }
end
end
所以"SomeCamelCase".to_underscore # =>"some_camel_case"
有被称为“下划线”,可以使用用于此目的的
一个Rails内置方法"CamelCaseString".underscore #=> "camel_case_string"
在“下划线”的方法通常可以被认为是“camelize”
的逆下面的滑轨如何它的:
def underscore(camel_cased_word)
camel_cased_word.to_s.gsub(/::/, '/').
gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').
gsub(/([a-z\d])([A-Z])/,'\1_\2').
tr("-", "_").
downcase
end
接收机转换为蛇情况: http://rubydoc.info/宝石/ EXTLIB / 0.9.15 /字符串#snake_case-instance_method
这是对的DataMapper和Merb支持库。 ( http://rubygems.org/gems/extlib )
def snake_case
return downcase if match(/\A[A-Z]+\z/)
gsub(/([A-Z]+)([A-Z][a-z])/, '\1_\2').
gsub(/([a-z])([A-Z])/, '\1_\2').
downcase
end
"FooBar".snake_case #=> "foo_bar"
"HeadlineCNNNews".snake_case #=> "headline_cnn_news"
"CNN".snake_case #=> "cnn"
查看 蛇箱 从 红宝石刻面
处理以下情况,如下所示:
"SnakeCase".snakecase #=> "snake_case"
"Snake-Case".snakecase #=> "snake_case"
"Snake Case".snakecase #=> "snake_case"
"Snake - Case".snakecase #=> "snake_case"
从: https://github.com/rubyworks/facets/blob/master/lib/core/facets/string/snakecase.rb
class String
# Underscore a string such that camelcase, dashes and spaces are
# replaced by underscores. This is the reverse of {#camelcase},
# albeit not an exact inverse.
#
# "SnakeCase".snakecase #=> "snake_case"
# "Snake-Case".snakecase #=> "snake_case"
# "Snake Case".snakecase #=> "snake_case"
# "Snake - Case".snakecase #=> "snake_case"
#
# Note, this method no longer converts `::` to `/`, in that case
# use the {#pathize} method instead.
def snakecase
#gsub(/::/, '/').
gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').
gsub(/([a-z\d])([A-Z])/,'\1_\2').
tr('-', '_').
gsub(/\s/, '_').
gsub(/__+/, '_').
downcase
end
#
alias_method :underscore, :snakecase
# TODO: Add *separators to #snakecase, like camelcase.
end
骆驼案件缺一个班轮当你的空间还包括(如果你有一个字其间有小的出发信无法正常工作):
a = "Test String"
a.gsub(' ', '').underscore
=> "test_string"
我想这样:
class String
# \n returns the capture group of "n" index
def snikize
self.gsub(/::/, '/')
.gsub(/([a-z\d])([A-Z])/, "\1_\2")
.downcase
end
# or
def snikize
self.gsub(/::/, '/')
.gsub(/([a-z\d])([A-Z])/) do
"#{$1}_#{$2}"
end
.downcase
end
end
String
类的猴补丁。有迹象表明,以大写两个或更多个字母开始的类。
不隶属于 StackOverflow