Class: ConlangWordGenerator::SymbolSet

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

Instance Method Summary collapse

Constructor Details

#initialize ⇒ SymbolSet

Returns a new instance of SymbolSet.



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# File 'lib/conlang/symbolset.rb', line 7

def initialize
  @pairs = []
  @weight_accum = 0
end

Instance Method Details

#+(other) ⇒ Object

Make Symbolset class appendable



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# File 'lib/conlang/symbolset.rb', line 51

def +(other)
  Append.new(self, other)
end

#add_pair(symbol, weight) ⇒ Object

Add new symbol with its probability into the set



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# File 'lib/conlang/symbolset.rb', line 13

def add_pair(symbol, weight)
  unless weight > 0 and weight < 100
    raise LangSyntaxError, "Weight of symbol '#{symbol}' must be " +
                           "a value between 1 and 99, inclusive."
  end

  # Insert new pair in the sorted array of pairs

  inserted = false
  @pairs.each_index do |index|
    if @pairs[index][1] > weight
      @pairs.insert(index, [symbol, weight])
      inserted = true
      break
    end
  end

  # Insert at the end, if requiered

  @pairs += [[symbol, weight]] unless inserted
  
  # Sum weights

  @weight_accum += weight
end

#sample ⇒ Object

Get a random symbol from the set



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# File 'lib/conlang/symbolset.rb', line 37

def sample
  random = rand(@weight_accum)

  accum = 0
  @pairs.each_index do |index|
    accum += @pairs[index][1]

    if accum > random
      return @pairs[index][0]
    end
  end
end