Class: VariableAssignmentQuestion

Inherits:
Question
  • Object
show all
Defined in:
lib/battleroom/models/variable_assignment_question.rb

Instance Attribute Summary collapse

Attributes inherited from Question

#answer_value, #data, #data_structure, #data_structure_class, #evaluation_scope, #explanation, #input_mechanism, #user_input, #variable_name, #variable_value

Instance Method Summary collapse

Methods inherited from Question

#congratulation_sequence, #enter_evaluation_loop, generate_question, #get_input, #handle_syntax_error_exceptions, #initialize

Constructor Details

This class inherits a constructor from Question

Instance Attribute Details

#formatted_class ⇒ Object

Returns the value of attribute formatted_class.



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# File 'lib/battleroom/models/variable_assignment_question.rb', line 6

def formatted_class
  @formatted_class
end

#formatted_value ⇒ Object

Returns the value of attribute formatted_value.



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# File 'lib/battleroom/models/variable_assignment_question.rb', line 6

def formatted_value
  @formatted_value
end

Instance Method Details

#evaluate_variable_assignment_input ⇒ Object 



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# File 'lib/battleroom/models/variable_assignment_question.rb', line 58

def evaluate_variable_assignment_input
  enter_evaluation_loop do |user_submission|
    begin
      evaluation_scope.eval(user_submission)
      if evaluation_scope.eval("#{variable_name} == #{formatted_value}")
        true
      else
        battleprint "You assigned the wrong value to #{variable_name}. Try again!".red
      end
    rescue NameError => e
      reveal_name_error_follies_to_user(user_submission, e)
    rescue Exception => e
      handle_base_exception(e)
    end
  end
end

#handle_base_exception(exception) ⇒ Object 



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# File 'lib/battleroom/models/variable_assignment_question.rb', line 50

def handle_base_exception(exception)
  if exception.message.match(/unterminated string/)
    battleprint 'Blurg! You neglected to provide closing quotes for your string. Try again!'.red
  else
    battleprint exception.message
  end
end

#post_initialize ⇒ Object 



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# File 'lib/battleroom/models/variable_assignment_question.rb', line 9

def post_initialize
  @variable_value = rotate_array(data[:possible_variable_values]).first
  @formatted_value = format_value_for_stdout_and_eval(variable_value)
  print_variable_assignment_prompt
  evaluate_variable_assignment_input
end

#print_variable_assignment_prompt ⇒ Object 



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# File 'lib/battleroom/models/variable_assignment_question.rb', line 16

def print_variable_assignment_prompt
  self.formatted_class = format_class_for_output(variable_value.class)
  substrings = [
    'Assign the variable '.blue,
    variable_name.yellow,
    ' to the '.blue,
    formatted_class.blue,
    ' value '.blue,
    formatted_value.yellow,
    ".\n".blue
  ]
  battleprint substrings.join
end

#reveal_name_error_follies_to_user(user_input, errorbefor) ⇒ Object 



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# File 'lib/battleroom/models/variable_assignment_question.rb', line 30

def reveal_name_error_follies_to_user(user_input, errorbefor)
  if user_input.include?(variable_name)
    if !user_input.match(/[^=]=[^=]/i)
      undefined_local_variable_prompt_for_correct_variable
    else
      misassignment_prompt
    end
  elsif !user_input.match(/("|')/) && variable_value.class == String
    battleprint 'Rats! You\'ve just made a common rookie mistake! Strings are always surrounded by quotes. Otherwise, Ruby will think you\'re referencing a variable or method name. Try again.'.red
  else
    battleprint "Looks like you mistyped the variable name. Check for misspellings and try again.".red
  end
end

#undefined_local_variable_prompt_for_correct_variable ⇒ Object 



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# File 'lib/battleroom/models/variable_assignment_question.rb', line 44

def undefined_local_variable_prompt_for_correct_variable
  battleprint "\nYou're referencing a variable that hasn't been assigned yet. This results in a common error that says: \n".red
  battleprint "\tundefined local variable or method \'#{variable_name}\'\n".green
  battleprint "To assign a value to a variable, you'll need to use the assignment operator ".red + ' = '.black.on_light_white + ", followed by a valid Ruby value.\n".red
end