Class: Code::Node::RightOperation

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

Constant Summary collapse

EQUAL = 
"="

Instance Method Summary collapse

Methods inherited from Code::Node

#resolve

Constructor Details

#initialize(parsed) ⇒ RightOperation

Returns a new instance of RightOperation.



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# File 'lib/code/node/right_operation.rb', line 8

def initialize(parsed)
  return if parsed.blank?

  @left = Statement.new(parsed.delete(:left).presence)
  @operator = parsed.delete(:operator).presence
  @right = Statement.new(parsed.delete(:right).presence)
end

Instance Method Details

#evaluate(**args) ⇒ Object 



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

def evaluate(**args)
  case @operator
  when "if"
    if (@right&.evaluate(**args) || Object::Nothing.new).truthy?
      @left&.evaluate(**args) || Object::Nothing.new
    else
      Object::Nothing.new
    end
  when "unless"
    if (@right&.evaluate(**args) || Object::Nothing.new).truthy?
      Object::Nothing.new
    else
      @left.evaluate(**args)
    end
  when "while"
    left = Object::Nothing.new

    left = @left&.evaluate(**args) || Object::Nothing.new while (
      @right&.evaluate(**args) || Object::Nothing.new
    ).truthy?

    left
  when "until"
    left = Object::Nothing.new

    left = @left&.evaluate(**args) || Object::Nothing.new while (
      @right&.evaluate(**args) || Object::Nothing.new
    ).falsy?

    left
  when "rescue"
    begin
      @left&.evaluate(**args) || Object::Nothing.new
    rescue Error
      @right&.evaluate(**args) || Object::Nothing.new
    end
  when /=$/
    right = @right&.evaluate(**args) || Object::Nothing.new
    left = @left&.resolve(**args) || Object::Nothing.new

    left.call(
      operator: @operator,
      arguments: Object::List.new([right]),
      **args
    )
  else
    right = @right&.evaluate(**args) || Object::Nothing.new
    left = @left&.evaluate(**args) || Object::Nothing.new

    left.call(
      operator: @operator,
      arguments: Object::List.new([right]),
      **args
    )
  end
end