Class: Code::Node::IfModifier

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

Constant Summary collapse

IF_KEYWORD = 
"if"
UNLESS_KEYWORD = 
"unless"
WHILE_KEYWORD = 
"while"
UNTIL_KEYWORD = 
"until"

Instance Method Summary collapse

Constructor Details

#initialize(parsed) ⇒ IfModifier

Returns a new instance of IfModifier.



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# File 'lib/code/node/if_modifier.rb', line 9

def initialize(parsed)
  @operator = parsed.delete(:operator)
  @left = Node::Statement.new(parsed.delete(:left))
  @right = Node::Statement.new(parsed.delete(:right))
  super(parsed)
end

Instance Method Details

#evaluate(**args) ⇒ Object 



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# File 'lib/code/node/if_modifier.rb', line 16

def evaluate(**args)
  if @operator == IF_KEYWORD
    if @right.evaluate(**args).truthy?
      @left.evaluate(**args)
    else
      ::Code::Object::Nothing.new
    end
  elsif @operator == UNLESS_KEYWORD
    if @right.evaluate(**args).falsy?
      @left.evaluate(**args)
    else
      ::Code::Object::Nothing.new
    end
  elsif @operator == WHILE_KEYWORD
    last = ::Code::Object::Nothing.new

    last = @left.evaluate(**args) while @right.evaluate(**args).truthy?

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

    last = @left.evaluate(**args) while @right.evaluate(**args).falsy?

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