Class: Trenni::Words::Filter

Inherits:
Object
  • Object
show all
Defined in:
lib/trenni/words/filter.rb

Overview

Filters patterns from a block of text.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(patterns) ⇒ Filter

Returns a new instance of Filter.



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# File 'lib/trenni/words/filter.rb', line 25

def initialize(patterns)
	@patterns = Regexp.union(*patterns)
end

Class Method Details

.for_obscenity ⇒ Object 



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# File 'lib/trenni/words/filter.rb', line 58

def self.for_obscenity
	@obscenity_filter ||= self.load_file(File.expand_path("obscenity.txt", __dir__))
end

.load_file(path) ⇒ Object 



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# File 'lib/trenni/words/filter.rb', line 50

def self.load_file(path)
	patterns = File.readlines(path).collect do |line|
		self.regexp_from_wildcard(line.chomp!)
	end
	
	Filter.new(patterns)
end

.regexp_from_wildcard(string) ⇒ Object

Convert a string into a regexp. If the string starts with a ‘/`, it’s considered a raw regexp.



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# File 'lib/trenni/words/filter.rb', line 42

def self.regexp_from_wildcard(string)
	if string.start_with? '/'
		return Regexp.new(string[1...-1], Regexp::IGNORECASE)
	else
		return Regexp.new('\b' + string + '\b', Regexp::IGNORECASE)
	end
end

Instance Method Details

#=~(text) ⇒ Object 



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# File 'lib/trenni/words/filter.rb', line 37

def =~ text
	@patterns =~ text
end

#apply(text) ⇒ Object 



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# File 'lib/trenni/words/filter.rb', line 33

def apply(text)
	text.gsub(@patterns, &self.method(:replace))
end

#replace(match) ⇒ Object 



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# File 'lib/trenni/words/filter.rb', line 29

def replace(match)
	'*' * match.length
end