Module: RubyNext::Core::StringStripSelectors

Defined in:
lib/ruby-next/core/string/strip.rb

Class Method Summary collapse

Class Method Details

.build_pattern(selectors) ⇒ Object

Converts selector strings (like "0-9", "^a-z", "abc") into a regex character class pattern. For multiple selectors, we need to handle intersection/negation



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# File 'lib/ruby-next/core/string/strip.rb', line 91

def self.build_pattern(selectors)
  selectors.each { |selector| raise TypeError, "no implicit conversion of #{selector} into String" unless selector.respond_to?(:to_str) }

  if selectors.length == 1
    selector = selectors[0].to_str
    if selector.start_with?("^")
      char_class = escape_for_char_class(selector[1..-1])
      "[^#{char_class}]"
    elsif !selector.empty?
      char_class = escape_for_char_class(selector)
      "[#{char_class}]"
    end
  else
    positive = []
    negative = []

    selectors.each do |s|
      str = s.to_str
      if str.start_with?("^")
        negative << escape_for_char_class(str[1..-1])
      elsif !str.empty?
        positive << escape_for_char_class(str)
      end
    end

    if positive.any? && negative.any?
      pos_class = positive.join
      neg_class = negative.join
      "[#{pos_class}&&[^#{neg_class}]]"
    elsif positive.any?
      "[#{positive.join}]"
    elsif negative.any?
      "[^#{negative.join}]"
    end
  end
end

.escape_for_char_class(selector) ⇒ Object 



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# File 'lib/ruby-next/core/string/strip.rb', line 128

def self.escape_for_char_class(selector)
  str = selector.to_str

  # Escape special characters but preserve ranges
  # Inside character class: need to escape ] \ ^
  # - is special only between characters (part of range)
  str.gsub(/(?<!^)([\]\\\^])/) { "\\#{$1}" }
end