Class: Minesweeper::Console::Parser::CommandParser

Inherits:
Object
  • Object
show all
Defined in:
lib/minesweeper/console/parser/command_parser.rb

Instance Method Summary collapse

Constructor Details

#initialize(a_minefield) ⇒ CommandParser

Returns a new instance of CommandParser.

Raises:

  • (ArgumentError) 


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# File 'lib/minesweeper/console/parser/command_parser.rb', line 12

def initialize(a_minefield)
  raise ArgumentError if a_minefield.nil?
  @minefield = a_minefield
end

Instance Method Details

#parse(user_input) ⇒ Object 



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# File 'lib/minesweeper/console/parser/command_parser.rb', line 17

def parse(user_input)
  if user_input.nil? || user_input =~ /^\s*$/
    return NullCommand.new(@minefield)
  end
  validate_user_input(user_input)
  tokens = user_input.split(/\s+/)
  case tokens[0].upcase
  when 'R', 'REVEAL'
    RevealCommand.new(@minefield, *tokens[1,2].map(&:to_i))
  when 'F', 'FLAG'
    FlagCommand.new(@minefield, *tokens[1,2].map(&:to_i))
  when 'U', 'UNFLAG'
    UnflagCommand.new(@minefield, *tokens[1,2].map(&:to_i))
  end
end