Class: BCDice::GameSystem::SwordWorld::RatingLexer

Inherits:
Object
  • Object
show all
Defined in:
lib/bcdice/game_system/sword_world/rating_lexer.rb

Constant Summary collapse

SYMBOLS = 
{
  "+" => :PLUS,
  "-" => :MINUS,
  "*" => :ASTERISK,
  "/" => :SLASH,
  "(" => :PARENL,
  ")" => :PARENR,
  "[" => :BRACKETL,
  "]" => :BRACKETR,
  "@" => :AT,
  "#" => :SHARP,
  "$" => :DOLLAR,
}.freeze

Instance Method Summary collapse

Constructor Details

#initialize(source) ⇒ RatingLexer

Returns a new instance of RatingLexer.



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# File 'lib/bcdice/game_system/sword_world/rating_lexer.rb', line 23

def initialize(source)
  # sourceが空文字だとString#splitが空になる
  source = source&.split(" ", 2)&.first || ""
  @scanner = StringScanner.new(source)
end

Instance Method Details

#next_token ⇒ Object 



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# File 'lib/bcdice/game_system/sword_world/rating_lexer.rb', line 29

def next_token
  return [false, "$"] if @scanner.eos?

  if (number = @scanner.scan(/\d+/))
    [:NUMBER, number.to_i]
  else
    char = @scanner.getch.upcase
    type = SYMBOLS[char] || char.to_sym
    [type, char]
  end
end

#source ⇒ Object 



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# File 'lib/bcdice/game_system/sword_world/rating_lexer.rb', line 41

def source
  @scanner.string
end