Class: Keybox::CharGramGenerator

Inherits:
StringGenerator show all
Defined in:
lib/keybox/string_generator.rb

Overview

CharGramGenerator emits a sequence that is a CharGram of length N. The ngrams can be the default ones that ship with keybox or an array passed in.

Instance Attribute Summary collapse

Attributes inherited from StringGenerator

#autoclear, #chunks, #max_length, #min_length

Instance Method Summary collapse

Methods inherited from StringGenerator

#clear, #generate, #to_s, #valid?

Constructor Details

#initialize(chargram_list = nil) ⇒ CharGramGenerator

Returns a new instance of CharGramGenerator.



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# File 'lib/keybox/string_generator.rb', line 54

def initialize(chargram_list = nil)
    super()
    wordlist = chargram_list || load_default_chargram_list
    @pool          = Hash.new
    wordlist.each do |word|
        letters = word.split('')
        letter_set = @pool[letters.first] ||= Array.new
        letter_set << word
    end
end

Instance Attribute Details

#pool ⇒ Object (readonly)

Returns the value of attribute pool.



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# File 'lib/keybox/string_generator.rb', line 51

def pool
  @pool
end

Instance Method Details

#generate_chunk ⇒ Object

return a random chargram from the pool indidcated by the last character of the last emitted item



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# File 'lib/keybox/string_generator.rb', line 71

def generate_chunk
    pool_key = ""
    if @chunks.size > 0 then
        pool_key = @chunks.pop
    else
        pool_key = @randomizer.pick_one_from(@pool.keys)
    end
    new_chunk = @randomizer.pick_one_from(@pool[pool_key])
    @chunks.concat(new_chunk.split(//))
    new_chunk
end

#size ⇒ Object 



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# File 'lib/keybox/string_generator.rb', line 65

def size
    @pool.inject(0) { |sum,h| sum + h[1].size }
end