Class: Sastrawi::Stemmer::Context::Context

Inherits:
Object
  • Object
show all
Defined in:
lib/sastrawi/stemmer/context/context.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(original_word, dictionary, visitor_provider) ⇒ Context

Returns a new instance of Context.



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# File 'lib/sastrawi/stemmer/context/context.rb', line 14

def initialize(original_word, dictionary, visitor_provider)
    @original_word = original_word
    @current_word = original_word
    @dictionary = dictionary
    @visitor_provider = visitor_provider

    @process_is_stopped = false
    @removals = []
    @visitors = nil
    @suffix_visitors = nil
    @prefix_visitors = nil
    @result = nil

    init_visitors
end

Instance Attribute Details

#current_word ⇒ Object

Returns the value of attribute current_word.



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# File 'lib/sastrawi/stemmer/context/context.rb', line 12

def current_word
  @current_word
end

#dictionary ⇒ Object (readonly)

Returns the value of attribute dictionary.



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# File 'lib/sastrawi/stemmer/context/context.rb', line 11

def dictionary
  @dictionary
end

#original_word ⇒ Object (readonly)

Returns the value of attribute original_word.



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# File 'lib/sastrawi/stemmer/context/context.rb', line 11

def original_word
  @original_word
end

#prefix_visitors ⇒ Object (readonly)

Returns the value of attribute prefix_visitors.



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# File 'lib/sastrawi/stemmer/context/context.rb', line 11

def prefix_visitors
  @prefix_visitors
end

#process_is_stopped ⇒ Object

Returns the value of attribute process_is_stopped.



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# File 'lib/sastrawi/stemmer/context/context.rb', line 12

def process_is_stopped
  @process_is_stopped
end

#removals ⇒ Object

Returns the value of attribute removals.



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# File 'lib/sastrawi/stemmer/context/context.rb', line 12

def removals
  @removals
end

#result ⇒ Object

Returns the value of attribute result.



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# File 'lib/sastrawi/stemmer/context/context.rb', line 12

def result
  @result
end

#suffix_visitors ⇒ Object (readonly)

Returns the value of attribute suffix_visitors.



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# File 'lib/sastrawi/stemmer/context/context.rb', line 11

def suffix_visitors
  @suffix_visitors
end

#visitor_provider ⇒ Object (readonly)

Returns the value of attribute visitor_provider.



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# File 'lib/sastrawi/stemmer/context/context.rb', line 11

def visitor_provider
  @visitor_provider
end

#visitors ⇒ Object (readonly)

Returns the value of attribute visitors.



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# File 'lib/sastrawi/stemmer/context/context.rb', line 11

def visitors
  @visitors
end

Instance Method Details

#accept(visitor) ⇒ Object 



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# File 'lib/sastrawi/stemmer/context/context.rb', line 136

def accept(visitor)
  visitor.visit(self)
end

#accept_prefix_visitors(visitors) ⇒ Object 



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# File 'lib/sastrawi/stemmer/context/context.rb', line 150

def accept_prefix_visitors(visitors)
  removal_length = @removals.length

  visitors.each do |visitor|
    accept(visitor)

    return @current_word if @dictionary.contains?(@current_word)

    return @current_word if @process_is_stopped

    return if @removals.length > removal_length
  end
end

#accept_visitors(visitors) ⇒ Object 



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# File 'lib/sastrawi/stemmer/context/context.rb', line 140

def accept_visitors(visitors)
  visitors.each do |visitor|
    accept(visitor)

    return @current_word if @dictionary.contains?(@current_word)

    return @current_word if @process_is_stopped
  end
end

#add_removal(removal) ⇒ Object 



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# File 'lib/sastrawi/stemmer/context/context.rb', line 40

def add_removal(removal)
  @removals.push(removal)
end

#execute ⇒ Object

Execute stemming process



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# File 'lib/sastrawi/stemmer/context/context.rb', line 47

def execute
  start_stemming_process

  if @dictionary.contains?(@current_word)
    @result = @current_word
  else
    @result = @original_word
  end
end

#init_visitors ⇒ Object 



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# File 'lib/sastrawi/stemmer/context/context.rb', line 30

def init_visitors
  @visitors = @visitor_provider.visitors
  @suffix_visitors = @visitor_provider.suffix_visitors
  @prefix_visitors = @visitor_provider.prefix_visitors
end

#loop_last_return ⇒ Object

ECS loop last return



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# File 'lib/sastrawi/stemmer/context/context.rb', line 95

def loop_last_return
  restore_prefix

  removals = @removals
  reversed_removals = removals.reverse
  current_word = @current_word

  reversed_removals.each do |reverse_removal|
    next unless suffix_removal?(reverse_removal)

    if reverse_removal.removed_part == 'kan'
      @current_word = reverse_removal.result << 'k'

      remove_prefixes
      return if @dictionary.contains?(@current_word)

      @current_word = reverse_removal.result << 'kan'
    else
      @current_word = reverse_removal.subject
    end

    remove_prefixes
    return if @dictionary.contains?(@current_word)

    @removals = removals
    @current_word = current_word
  end
end

#remove_prefixes ⇒ Object 



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# File 'lib/sastrawi/stemmer/context/context.rb', line 124

def remove_prefixes
  3.times do
    accept_prefix_visitors(@prefix_visitors)

    return if @dictionary.contains?(@current_word)
  end
end

#remove_suffixes ⇒ Object 



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# File 'lib/sastrawi/stemmer/context/context.rb', line 132

def remove_suffixes
  accept_visitors(@suffix_visitors)
end

#restore_prefix ⇒ Object

Restore prefix to proceed with ECS loop last return



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# File 'lib/sastrawi/stemmer/context/context.rb', line 174

def restore_prefix
  @removals.each do |removal|
    if removal.affix_type == 'DP'
      @current_word = removal.subject
      break
    end
  end

  @removals.each do |removal|
    if removal.affix_type == 'DP'
      @removals.delete(removal)
    end
  end
end

#start_stemming_process ⇒ Object 



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# File 'lib/sastrawi/stemmer/context/context.rb', line 57

def start_stemming_process
  return if @dictionary.contains?(@current_word)

  accept_visitors(@visitors)

  return if @dictionary.contains?(@current_word)

  cs_precendence_adjustment_specification = Sastrawi::Stemmer::ConfixStripping::PrecedenceAdjustmentSpecification.new

  ##
  # Confix stripping
  # try to remove prefix before suffix if the specification is met

  if cs_precendence_adjustment_specification.satisfied_by?(@original_word)
    remove_prefixes
    return if @dictionary.contains?(@current_word)

    remove_suffixes
    if @dictionary.contains?(@current_word)
      return
    else
      @current_word = @original_word
      @removals = []
    end
  end

  remove_suffixes
  return if @dictionary.contains?(@current_word)

  remove_prefixes
  return if @dictionary.contains?(@current_word)

  loop_last_return
end

#stop_process ⇒ Object 



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# File 'lib/sastrawi/stemmer/context/context.rb', line 36

def stop_process
  @process_is_stopped = true
end

#suffix_removal?(removal) ⇒ Boolean

Check whether the removed part is a suffix

Returns:

  • (Boolean) 


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# File 'lib/sastrawi/stemmer/context/context.rb', line 167

def suffix_removal?(removal)
  removal.affix_type == 'DS' || removal.affix_type == 'PP' || removal.affix_type == 'P'
end