Class: Code::Node::While

Inherits:
Code::Node show all
Defined in:
lib/code/node/while.rb

Constant Summary collapse

WHILE_KEYWORD = 
"while"
UNTIL_KEYWORD = 
"until"

Instance Method Summary collapse

Constructor Details

#initialize(parsed) ⇒ While

Returns a new instance of While.



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# File 'lib/code/node/while.rb', line 7

def initialize(parsed)
  @operator = parsed.delete(:operator)
  @statement = Node::Statement.new(parsed.delete(:statement))
  @body = Node::Code.new(parsed.delete(:body))
  super(parsed)
end

Instance Method Details

#evaluate(**args) ⇒ Object 



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# File 'lib/code/node/while.rb', line 14

def evaluate(**args)
  if @operator == WHILE_KEYWORD
    last = ::Code::Object::Nothing.new

    while @statement.evaluate(**args).truthy?
      last = @body.evaluate(**args)
    end

    last
  elsif @operator == UNTIL_KEYWORD
    last = ::Code::Object::Nothing.new

    last = @body.evaluate(**args) while @statement.evaluate(**args).falsy?

    last
  else
    raise NotImplementedError.new(@operator)
  end
end