Class: Antlr4::Runtime::ArrayPredictionContext

Inherits:
PredictionContext show all
Defined in:
lib/antlr4/runtime/array_prediction_context.rb

Constant Summary

Constants inherited from PredictionContext

PredictionContext::EMPTY_RETURN_STATE, PredictionContext::INITIAL_HASH

Instance Attribute Summary collapse

Attributes inherited from PredictionContext

#cached_hash_code

Instance Method Summary collapse

Methods inherited from PredictionContext

#empty_path?, #hash, #to_s_recog, #to_strings, #to_strings3, #to_strings3_inner

Constructor Details

#initialize(parents, return_states = nil) ⇒ ArrayPredictionContext

Returns a new instance of ArrayPredictionContext.



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# File 'lib/antlr4/runtime/array_prediction_context.rb', line 7

def initialize(parents, return_states = nil)
  if parents.is_a? SingletonPredictionContext
    return_states = [parents.return_state]
    parents = [parents.parent]
  end

  super(PredictionContextUtils.calculate_hash_code2(parents, return_states))
  @parents = parents
  @return_states = return_states
end

Instance Attribute Details

#parents ⇒ Object

Returns the value of attribute parents.



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# File 'lib/antlr4/runtime/array_prediction_context.rb', line 4

def parents
  @parents
end

#return_states ⇒ Object

Returns the value of attribute return_states.



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# File 'lib/antlr4/runtime/array_prediction_context.rb', line 5

def return_states
  @return_states
end

Instance Method Details

#empty? ⇒ Boolean

since EMPTY_RETURN_STATE can only appear in the last position, we

Returns:

  • (Boolean) 


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# File 'lib/antlr4/runtime/array_prediction_context.rb', line 18

def empty? # since EMPTY_RETURN_STATE can only appear in the last position, we
  # don't need to verify that size==1
  @return_states[0] == EMPTY_RETURN_STATE
end

#equals(o) ⇒ Object 



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# File 'lib/antlr4/runtime/array_prediction_context.rb', line 35

def equals(o)
  if self == o
    return true
  elsif !(o.is_a? ArrayPredictionContext)
    return false
  end

  if hash != o.hash
    return false # can't be same if hash is different
  end

  (@return_states.eql? o.return_states) && (@parents.eql? o.parents)
end

#get_parent(index) ⇒ Object 



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# File 'lib/antlr4/runtime/array_prediction_context.rb', line 27

def get_parent(index)
  @parents[index]
end

#get_return_state(index) ⇒ Object 



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# File 'lib/antlr4/runtime/array_prediction_context.rb', line 31

def get_return_state(index)
  @return_states[index]
end

#size ⇒ Object 



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# File 'lib/antlr4/runtime/array_prediction_context.rb', line 23

def size
  @return_states.length
end

#to_s ⇒ Object 



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# File 'lib/antlr4/runtime/array_prediction_context.rb', line 49

def to_s
  return '[]' if empty?

  buf = ''
  buf << '['
  i = 0
  while i < @return_states.length
    buf << ', ' if i > 0
    if return_states[i] == EMPTY_RETURN_STATE
      buf << '$'
      i += 1
      next
    end
    buf << @return_states[i]
    if !@parents[i].nil?
      buf << ' '
      buf << @parents[i].to_s
    else
      buf << 'nil'
    end
    i += 1
  end

  buf << ']'
  buf.to_s
end