Class: Antlr4::Runtime::ATNState

Inherits:
Object
  • Object
show all
Defined in:
lib/antlr4/runtime/atn_state.rb

Constant Summary collapse

INITIAL_NUM_TRANSITIONS = 
4
INVALID_TYPE = 
0
BASIC = 
1
RULE_START = 
2
BLOCK_START = 
3
PLUS_BLOCK_START = 
4
STAR_BLOCK_START = 
5
TOKEN_START = 
6
RULE_STOP = 
7
BLOCK_END = 
8
STAR_LOOP_BACK = 
9
STAR_LOOP_ENTRY = 
10
PLUS_LOOP_BACK = 
11
LOOP_END = 
12
@@serialization_names = 
%w[INVALID BASIC RULE_START BLOCK_START PLUS_BLOCK_START STAR_BLOCK_START TOKEN_START RULE_STOP BLOCK_END STAR_LOOP_BACK STAR_LOOP_ENTRY PLUS_LOOP_BACK LOOP_END]
@@invalid_state_number = 
-1

Class Attribute Summary collapse

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ATNState

Returns a new instance of ATNState.



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# File 'lib/antlr4/runtime/atn_state.rb', line 32

def initialize
  @atn = nil
  @state_number = @@invalid_state_number
  @rule_index = 0
  @epsilon_only_transitions = false
  @transitions = []
  @next_token_within_rule = nil
end

Class Attribute Details

.invalid_state_number ⇒ Object

Returns the value of attribute invalid_state_number.



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# File 'lib/antlr4/runtime/atn_state.rb', line 21

def invalid_state_number
  @invalid_state_number
end

Instance Attribute Details

#atn ⇒ Object

Returns the value of attribute atn.



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# File 'lib/antlr4/runtime/atn_state.rb', line 28

def atn
  @atn
end

#next_token_within_rule ⇒ Object

Returns the value of attribute next_token_within_rule.



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

def next_token_within_rule
  @next_token_within_rule
end

#rule_index ⇒ Object

Returns the value of attribute rule_index.



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# File 'lib/antlr4/runtime/atn_state.rb', line 30

def rule_index
  @rule_index
end

#state_number ⇒ Object

Returns the value of attribute state_number.



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# File 'lib/antlr4/runtime/atn_state.rb', line 29

def state_number
  @state_number
end

#transitions ⇒ Object (readonly)

Returns the value of attribute transitions.



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# File 'lib/antlr4/runtime/atn_state.rb', line 57

def transitions
  @transitions
end

Instance Method Details

#add_transition(e) ⇒ Object 



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# File 'lib/antlr4/runtime/atn_state.rb', line 63

def add_transition(e)
  add_transition_at(@transitions.length, e)
end

#add_transition_at(index, e) ⇒ Object 



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# File 'lib/antlr4/runtime/atn_state.rb', line 67

def add_transition_at(index, e)
  if @transitions.empty?

    @epsilon_only_transitions = e.epsilon?

  elsif @epsilon_only_transitions != e.epsilon?

    STDERR.puts format("ATN state %d has both epsilon and non-epsilon transitions.\n", state_number)
    @epsilon_only_transitions = false
  end
  already_present = false

  i = 0
  while i < @transitions.length
    t = @transitions[i]
    if t.target.state_number == e.target.state_number

      if !t.label.nil? && !e.label.nil? && t.label.eql?(e.label)
        already_present = true
        break
      elsif t.epsilon? && e.epsilon?
        already_present = true
        break
      end
    end
    i += 1
  end

  @transitions[index] = e unless already_present
end

#eql?(other_key) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/antlr4/runtime/atn_state.rb', line 45

def eql?(other_key)
  @state_number == other_key.state_number
end

#hash ⇒ Object 



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# File 'lib/antlr4/runtime/atn_state.rb', line 41

def hash
  @state_number
end

#non_greedy_exit_state? ⇒ Boolean

Returns:

  • (Boolean) 


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

def non_greedy_exit_state?
  false
end

#number_of_transitions ⇒ Object 



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# File 'lib/antlr4/runtime/atn_state.rb', line 59

def number_of_transitions
  @transitions.length
end

#only_has_epsilon_transitions ⇒ Object 



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# File 'lib/antlr4/runtime/atn_state.rb', line 110

def only_has_epsilon_transitions
  @epsilon_only_transitions
end

#remove_transition(index) ⇒ Object 



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# File 'lib/antlr4/runtime/atn_state.rb', line 106

def remove_transition(index)
  @transitions.delete_at index
end

#set_rule_index(rule_index) ⇒ Object 



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# File 'lib/antlr4/runtime/atn_state.rb', line 114

def set_rule_index(rule_index)
  @rule_index = rule_index
end

#set_transition(i, e) ⇒ Object 



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# File 'lib/antlr4/runtime/atn_state.rb', line 102

def set_transition(i, e)
  @transitions[i] = e
end

#to_s ⇒ Object 



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# File 'lib/antlr4/runtime/atn_state.rb', line 53

def to_s
  @state_number.to_s
end

#transition(i) ⇒ Object 



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# File 'lib/antlr4/runtime/atn_state.rb', line 98

def transition(i)
  @transitions[i]
end