Class: WordFilter::Filter

Inherits:
Object
  • Object
show all
Defined in:
lib/word_filter.rb

Constant Summary collapse

NONE = 
0
REPEATED_VOWELS = 
1
SWAPPABLE_VOWELS = 
2
SWAPPABLE_AND_REPEATED_VOWELS = 
3
SWAPPABLE_AND_REPEATED_VOWELS_INCLUDING_NONE = 
4
@@emailRegex = 
/[a-zA-Z0-9._%+-]+@[a-z0-9.-]+\\.[a-zA-Z]{2,4}/
@@alphaNumericDigit = 
/(zero|one|two|three|four|five|six|seven|eight|nine|ten|eleven|twelve|thirteen|fourteen|fifteen|sixteen|seventeen|eighteen|nineteen|twenty|\d)/
@@digitsRegex = 
Regexp.new("\b(\s*" + @@alphaNumericDigit.source + ")+\b")
@@streetNameRegex = 
Regexp.new("\b(\s*" + @@alphaNumericDigit.source + ")+\s([a-z\d]+\.?\s*){1,5}\b(avenue|ave|street|st|court|ct|circle|boulevard|blvd|lane|ln|trail|tr|loop|lp|route|rt|drive|dr|road|rd|terrace|tr|way|wy|highway|hiway|hw)\b")
@@phoneNumber = 
Regexp.new("((" + @@alphaNumericDigit.source + ")\W*?){3}((" + @@alphaNumericDigit.source + ")\W*?){4}\b")
@@urlRegex = 
/(?:http|https):\/\/[a-z0-9]+(?:[\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(?:(?::[0-9]{1,5})?\/[^\s]*)?/

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Filter

Returns a new instance of Filter.



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# File 'lib/word_filter.rb', line 21

def initialize()
    @filterLevel = NONE
end

Instance Attribute Details

#badWordsRegex ⇒ Object

Returns the value of attribute badWordsRegex.



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# File 'lib/word_filter.rb', line 25

def badWordsRegex
  @badWordsRegex
end

#filterLevel ⇒ Object

Returns the value of attribute filterLevel.



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# File 'lib/word_filter.rb', line 25

def filterLevel
  @filterLevel
end

#goodWords ⇒ Object

Returns the value of attribute goodWords.



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# File 'lib/word_filter.rb', line 25

def goodWords
  @goodWords
end

Instance Method Details

#filterInit(dictionaryFile, badwordslist) ⇒ Object 



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# File 'lib/word_filter.rb', line 27

def filterInit(dictionaryFile, badwordslist)
    @goodWords = loadDictionary(dictionaryFile)
    #The original java class requiere other three word's list
    @datingWordsRegex = /dating/
    @deviantWordsRegex = /deviant/
    @badWordsRegex = loadBadwords(badwordslist)
    
    vowels = /([aeiou])/
    @vowelSwappedAndRepeatedRegex = Regexp.new(@badWordsRegex.source.gsub(vowels, "[aeiou]+"))
    @vowelSwappedAndRepeatedRegexIncludingEmpty = Regexp.new(@badWordsRegex.source.gsub(vowels, "[aeiou]*"))
 @vowelRepeatedRegex = Regexp.new(@badWordsRegex.source.gsub(vowels, "\\1+"))
 @vowelSwappedRegex = Regexp.new(@badWordsRegex.source.gsub(vowels, "[aeiou]"))
    
end

#filterString(input) ⇒ Object 



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# File 'lib/word_filter.rb', line 62

def filterString(input)

#        Output:
#   -1: An exception occured while trying to check the string, do not post
#   0: string is safe to post
#   1: string contains an email address
#   2: string contains a URL
#   3: string contains a street address
#   4: string contains a phone number
#   5: string contains a dating word
#   6: string contains a deviant word
#   9: string contains any other bad word

    input = input.strip.downcase
    workingCopy = input
    
    if input == ""
        return 0
    end
    
    if @@emailRegex.match(input)
        return 1
    end
    
    if @@urlRegex.match(input)
        return 2
    end
    
    if @@streetNameRegex.match(input)
        return 3
    end
    
    if @@phoneNumber.match(input)
        return 4
    end
    
    workingCopy.gsub("\s+", " ")
    workingCopy.gsub!(/["',.;:?-]/, " ")
    workingCopy.gsub!(/!+\s/, " ")
    workingCopy.gsub!(/!+\z/, " ")
    workingCopy.gsub!(/\br\su/, " ")
    
    cleanVersion = stripGoodWords(workingCopy)
    
    if cleanVersion == nil or cleanVersion.length == 0
        return 0
    end
    
    if @datingWordsRegex.match(cleanVersion)
        return 5
    end
    
    if @deviantWordsRegex.match(cleanVersion)
        return 6
    end
   
    if @badWordsRegex.match(cleanVersion)
        return 7
    end

    #let's try various combinations of bad word tricks
    currentVersion = cleanVersion
    
    #compress the string then check it again
    if @badWordsRegex.match(currentVersion.gsub("[ \t\n\f\r]", ""))
        return 9
    end
    
    #zap special characters and check it again
    if @badWordsRegex.match(currentVersion.gsub("[^a-z]", ""))
        return 9
    end
    
    #replace certain special characters with their letter equivalents
    #NOTE: This one maps vertical non-letter chars (!1|) to i
    specialCharsReplaced_i = currentVersion.tr("@683!1|0$+","abbeiiiost")
    if @badWordsRegex.match(specialCharsReplaced_i)
        return 9
    end
    
    #replace certain special characters with their letter equivalents
    #NOTE: This one maps vertical non-letter chars (!1|) to l
    specialCharsReplaced_l = currentVersion.tr("@683!1|0$+","abbelllost")
    if @badWordsRegex.match(specialCharsReplaced_l)
        return 9
    end
    
    case @filterLevel
    when NONE
        return 0
    when REPEATED_VOWELS
        if @vowelRepeatedRegex.match(specialCharsReplaced_i) or @vowelRepeatedRegex.match(specialCharsReplaced_l)
            return 9
        end
    when SWAPPABLE_VOWELS
        if @vowelSwappedRegex.match(specialCharsReplaced_i) or @vowelSwappedRegex.match(specialCharsReplaced_l)
            return 9
        end
    when SWAPPABLE_AND_REPEATED_VOWELS
        if @vowelSwappedAndRepeatedRegex.match(specialCharsReplaced_i) or @vowelSwappedAndRepeatedRegex.match(specialCharsReplaced_l)
            return 9
        end
    when SWAPPABLE_AND_REPEATED_VOWELS_INCLUDING_NONE
        if @vowelSwappedAndRepeatedRegexIncludingEmpty.match(specialCharsReplaced_i) or @vowelSwappedAndRepeatedRegexIncludingEmpty.match(specialCharsReplaced_l)
            return 9
        end
    end

end

#loadBadwords(path) ⇒ Object 



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# File 'lib/word_filter.rb', line 54

def loadBadwords(path)
  words = File.read(path).gsub("\r", '').split("\n")
  regex = words.join('|')
  regex = '(' + regex + ')'
  regex = Regexp.new(regex)
  return regex
end

#loadDictionary(path) ⇒ Object 



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# File 'lib/word_filter.rb', line 43

def loadDictionary(path)
    words = []
    File.open(path, "r").each_line do |line|
        splitted = line.split(" ")
        splitted.each do |w|
            words << w
        end
    end
    return words
end

#stripGoodWords(input) ⇒ Object 



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# File 'lib/word_filter.rb', line 172

def stripGoodWords(input)
    result = []
    input = input.split(" ")
    input.each do |w|
        if not @goodWords.include? w
            result << w
        end
    end
    return result.join(" ")
end