CamelCase Jekyll滤波器

Question

我正在尝试做一个CamelCase Jekyll过滤器。

=begin
  # Custom to camelcase function
  # Usage:
  #   'string'.camelize
  #   'string'.camelize(:lower)
=end
class String
  def camelize(*separators)
    case separators.first
    when Symbol, TrueClass, FalseClass, NilClass
      first_letter = separators.shift
    end

    separators = ['_', '\s'] if separators.empty?

    str = self.dup

    separators.each do |s|
      str = str.gsub(/(?:#{s}+)([a-z])/){ $1.upcase }
    end

    case first_letter
    when :upper, true
      str = str.gsub(/(\A|\s)([a-z])/){ $1 + $2.upcase }
    when :lower, false
      str = str.gsub(/(\A|\s)([A-Z])/){ $1 + $2.downcase }
    end

    str
  end
end

=begin
  Jekyll filter to convert string to camelcase
  Usage:
    {% 'string' | camelcase %}
=end
module Jekyll
  module CamelCase
    def camelcase(input)
      input.camelize(:lower)
    end
  end
end
Liquid::Template.register_filter(Jekyll::CamelCase)

当筛选字符串时，它是成功的：

{{ 'Page Title' | camelcase }} # pageTitle

在页变量上使用时，不使用...but：

{{ page.title | camelcase }} # Page Title

有什么东西我错过了吗？有人可以试试这个在那里自己安装Jekyll吗？

这不太重要，但它已经困扰我好几个小时了。

谢谢大家。=)

Answer 1

问题在于这三条线：

# mainly this one
str = str.gsub(/(?:#{s}+)([a-z])/){ $1.upcase }

# but also these two as well
str = str.gsub(/(\A|\s)([a-z])/){ $1 + $2.upcase }
str = str.gsub(/(\A|\s)([A-Z])/){ $1 + $2.downcase }

当我提供字符串Hello World时，正则表达式与空格不匹配，因为它后面跟着大写字母。\s[a-z]与' W'不匹配。因此，使用“速记字字符”(\w)代替。

以下代码起作用：

=begin
 # Custom to camelcase function
 # Usage:
 #   'string'.camelize
 #   'string'.camelize(:lower)
=end
class String
  def camelize(*separators)
    case separators.first
    when Symbol, TrueClass, FalseClass, NilClass
      first_letter = separators.shift
    end

    separators = ['_', '\s'] if separators.empty?

    str = self.dup

    separators.each do |s|
      str = str.gsub(/(?:#{s}+)([\w])/){ $1.upcase }
    end

    case first_letter
    when :upper, true
      str = str.gsub(/(\A|\s)([\w])/){ $1 + $2.upcase }
    when :lower, false
      str = str.gsub(/(\A|\s)([\w])/){ $1 + $2.downcase }
    end

    str
  end
end

puts('Hello World'.camelize())        # HelloWorld
puts('Hello World'.camelize(:lower))  # helloWorld
puts('Hello World'.camelize(:upper))  # HelloWorld
puts('hello world'.camelize())        # HelloWorld
puts('hello world'.camelize(:lower))  # helloWorld
puts('hello world'.camelize(:upper))  # HelloWorld