Class: Antlr4ruby::Vocabulary

Inherits:
Object
  • Object
show all
Defined in:
lib/antlr4ruby/vocabulary.rb

Constant Summary collapse

EMPTY_VOCABULARY = 
Vocabulary.new(EMPTY_NAMES, EMPTY_NAMES, EMPTY_NAMES)

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(literal_names, symbolic_names, display_names = []) ⇒ Vocabulary

Returns a new instance of Vocabulary.



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# File 'lib/antlr4ruby/vocabulary.rb', line 7

def initialize(literal_names, symbolic_names, display_names = [])
  super()
  @literal_names = literal_names || EMPTY_NAMES
  @symbolic_names = symbolic_names || EMPTY_NAMES
  @display_names = display_names || EMPTY_NAMES
  longer = literal_names.length > symbolic_names.length ? literal_names.length : symbolic_names.length
  @max_token_type = (longer > @display_names.length ? longer : @display_names.length) - 1
end

Class Method Details

.from_token_names(token_names) ⇒ Object 



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# File 'lib/antlr4ruby/vocabulary.rb', line 47

def from_token_names(token_names)
  return EMPTY_VOCABULARY if !token_names || (token_names.length <= 0)

  literal_names = token_names.clone
  symbolic_names = token_names.clone
  (0..token_names.length).each do |i|
    token_name = token_names[i]
    next unless token_name

    unless token_name.empty?
      case token_name[0]
      when '\''
        symbolic_names[i] = nil
        next
      when /[A-Z]+/
        literal_names[i] = nil
        next
      end
    end
    literal_names[i] = nil
    symbolic_names[i] = nil
  end
  Vocabulary.new(literal_names, symbolic_names, token_names)
end

Instance Method Details

#get_display_name(token_type) ⇒ Object 



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# File 'lib/antlr4ruby/vocabulary.rb', line 36

def get_display_name(token_type)
  @display_names[token_type] || get_literal_name(token_type) || get_symbolic_name(token_type) || token_type.to_s
end

#get_literal_name(token_type) ⇒ Object 



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# File 'lib/antlr4ruby/vocabulary.rb', line 26

def get_literal_name(token_type)
  @literal_names[token_type]
end

#get_max_token_type ⇒ Object 



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# File 'lib/antlr4ruby/vocabulary.rb', line 40

def get_max_token_type
  @max_token_type
end

#get_symbolic_name(token_type) ⇒ Object 



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# File 'lib/antlr4ruby/vocabulary.rb', line 30

def get_symbolic_name(token_type)
  return 'EOF' if token_type == Token::EOF

  @symbolic_names[token_type]
end