module Sensitive

# File lib/sensitive.rb, line 15
def add_word(word)
  word = word.strip.gsub(%r{[^\p{Han}+/ua-zA-Z0-9]}, '')
  word.chars.inject(self.words) do |words, char|
    if !words.key? char
      words[char] = {}
    end
    words[char]
  end
end

# File lib/sensitive.rb, line 26
def empty!
  self.words = {}
end

# File lib/sensitive.rb, line 43
def filter(word)
  sensitive_word = ''
  word = word.strip.gsub(%r{[^\p{Han}+/ua-zA-Z0-9]}, '')
  word.chars.each_with_index.inject(self.words) do |words, (char, index)|
    if words.key?(char)
      sensitive_word += char
      break if words[char].empty?
      # 如果被检测的词已是最后一个，但关键字还不是最后，则返为空
      return '' if index == word.size - 1
      words[char]
    else
      # 如果上一步在关键字中，这次又不在关键字中，需要重新初始化检测
      if !sensitive_word.empty?
        sensitive_word = ''
        words = self.words and redo
      else
        words
      end
    end
  end
  sensitive_word
end

# File lib/sensitive.rb, line 38
def load_default
  load_file(File.join( File.dirname(__FILE__), '../sensitives.txt' ))
end

# File lib/sensitive.rb, line 31
def load_file(file_path)
  File.open(file_path, 'r').each_line do |line|
    add_word(line)
  end
end