Class: NameGenerator

Inherits:
Object
  • Object
show all
Defined in:
lib/gemwarrior/misc/name_generator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(type) ⇒ NameGenerator

Returns a new instance of NameGenerator.



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# File 'lib/gemwarrior/misc/name_generator.rb', line 11

def initialize(type)
  self.type         = type
  self.name_set     = get_name_set(self.type)
  self.chain_cache  = {}
end

Instance Attribute Details

#chain_cache ⇒ Object

Returns the value of attribute chain_cache.



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# File 'lib/gemwarrior/misc/name_generator.rb', line 9

def chain_cache
  @chain_cache
end

#name_set ⇒ Object

Returns the value of attribute name_set.



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# File 'lib/gemwarrior/misc/name_generator.rb', line 9

def name_set
  @name_set
end

#type ⇒ Object

Returns the value of attribute type.



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# File 'lib/gemwarrior/misc/name_generator.rb', line 9

def type
  @type
end

Instance Method Details

#construct_chain(list) ⇒ Object

construct markov chain from list of names



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# File 'lib/gemwarrior/misc/name_generator.rb', line 69

def construct_chain(list)
  chain = {}

  for i in 0..list.length-1
    names = list[i].split(/\s+/)
    chain = incr_chain(chain, 'parts', names.length)

    for j in 0..names.length-1
      name = names[j].nil? ? [] : names[j]
      chain = incr_chain(chain, 'name_len', name.length)

      c = name[0, 1]
      chain = incr_chain(chain, 'initial', c)

      string = name[1..name.length]
      last_c = c

      while string.length > 0 do
        c = string[0, 1]
        chain = incr_chain(chain, last_c, c)

        string = string[1..string.length]
        last_c = c
      end
    end
  end

  return scale_chain(chain)
end

#generate_name ⇒ Object

generator function



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# File 'lib/gemwarrior/misc/name_generator.rb', line 28

def generate_name
  chain = nil

  if (chain = markov_chain(self.type))
    return markov_name(chain)
  end

  return ''
end

#generate_names(count = 1) ⇒ Object

generate multiple



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# File 'lib/gemwarrior/misc/name_generator.rb', line 39

def generate_names(count = 1)
  list = []

  (1..count).each {
    list.push(generate_name)
  }

  return list
end

#get_name_set(type) ⇒ Object

load sample names



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# File 'lib/gemwarrior/misc/name_generator.rb', line 18

def get_name_set(type)
  names = []
  names_data = YAML.load_file(File.expand_path("../../../../data/#{type}_names.yaml", __FILE__))
  names_data.each do |n|
    names.push(n)
  end
  return names
end

#incr_chain(chain, key, token) ⇒ Object 



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# File 'lib/gemwarrior/misc/name_generator.rb', line 99

def incr_chain(chain, key, token)
  if chain[key]
    if chain[key][token]
      chain[key][token] += 1
    else
      chain[key][token] = 1
    end
  else
    chain[key] = {}
    chain[key][token] = 1
  end

  return chain
end

#markov_chain(type) ⇒ Object

get markov chain by type



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# File 'lib/gemwarrior/misc/name_generator.rb', line 50

def markov_chain(type)
  chain = nil

  if (chain = chain_cache[type])
    return chain
  else
    if (list = name_set)
      chain = nil
      if (chain = construct_chain(list))
        chain_cache[type] = chain
        return chain
      end
    end
  end

  return false
end

#markov_name(chain) ⇒ Object

construct name from markov chain



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# File 'lib/gemwarrior/misc/name_generator.rb', line 135

def markov_name(chain)
  parts = select_link(chain, 'parts')
  names = []

  (0..parts-1).each {
    name_len = select_link(chain, 'name_len')
    c = select_link(chain, 'initial')
    name = c
    last_c = c

    while name.length < name_len do
      c = select_link(chain, last_c)
      name += c
      last_c = c
    end
    names.push(name)
  }

  return names.join(' ')
end

#scale_chain(chain) ⇒ Object 



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# File 'lib/gemwarrior/misc/name_generator.rb', line 114

def scale_chain(chain)
  table_len = {}

  chain.each do |key, subkey|
    table_len[key] = 0

    subkey.each do |subsubkey, value|
      count = value
      weighted = (count ** 1.3).floor

      chain[key][subsubkey] = weighted
      table_len[key] += weighted
    end
  end

  chain['table_len'] = table_len

  return chain
end

#select_link(chain, key) ⇒ Object 



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# File 'lib/gemwarrior/misc/name_generator.rb', line 156

def select_link(chain, key)
  len = chain['table_len'][key]
  idx = (rand() * len).floor

  t = 0
  chain[key].each do |chain_key, chain_value|
    t += chain_value
    return chain_key if (idx < t)
  end

  return '-'
end