Module: Dendroid::GrmAnalysis::ChoiceItems

Defined in:
lib/dendroid/grm_analysis/choice_items.rb

Overview

Mix-in module for extending the Syntax::Choice class with dotted items manipulation methods

Instance Method Summary collapse

Instance Method Details

#build_items ⇒ Array<Array<GrmAnalysis::AlternativeItem>>

Build the alternative items for this choice and assign them to the ‘items` attributes



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# File 'lib/dendroid/grm_analysis/choice_items.rb', line 13

def build_items
  # AlternativeItem
  @items = Array.new(alternatives.size) { |_| [] }
  alternatives.each_with_index do |alt_seq, index|
    if alt_seq.empty?
      @items[index] << AlternativeItem.new(self, 0, index)
    else
      (0..alt_seq.size).each do |pos|
        @items[index] << AlternativeItem.new(self, pos, index)
      end
    end
  end
end

#items ⇒ Array<Array<GrmAnalysis::AlternativeItem>>

Read accessor for the ‘items` attribute. Return the dotted items for this production



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# File 'lib/dendroid/grm_analysis/choice_items.rb', line 30

def items
  @items
end

#next_item(anItem) ⇒ GrmAnalysis::AlternativeItem|NilClass

Return the next item given the provided item. In other words, advance the dot by one position.



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# File 'lib/dendroid/grm_analysis/choice_items.rb', line 52

def next_item(anItem)
  items_arr = items[anItem.alt_index]
  return nil if anItem == items_arr.last

  items_arr[anItem.position + 1]
end

#predicted_items ⇒ Array<GrmAnalysis::AlternativeItem>

Return the predicted items (i.e. the alternative items with the dot at start) for this choice.



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# File 'lib/dendroid/grm_analysis/choice_items.rb', line 37

def predicted_items
  @items.map(&:first)
end

#reduce_items ⇒ Array<GrmAnalysis::AlternativeItem>

Return the reduce items (i.e. the alternative items with the dot at end) for this choice.



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# File 'lib/dendroid/grm_analysis/choice_items.rb', line 44

def reduce_items
  @items.map(&:last)
end