Class: Basic101::ForStack

Inherits:
Object
  • Object
show all
Defined in:
lib/basic101/for_stack.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ForStack

Returns a new instance of ForStack.



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# File 'lib/basic101/for_stack.rb', line 7

def initialize
  @stack = []
end

Instance Method Details

#[](reference) ⇒ Object 



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# File 'lib/basic101/for_stack.rb', line 36

def [](reference)
  @stack.find do |statement|
    statement.reference == reference
  end
end

#delete_reference(reference) ⇒ Object 



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# File 'lib/basic101/for_stack.rb', line 30

def delete_reference(reference)
  @stack.reject! do |statement|
    statement.reference == reference
  end
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/basic101/for_stack.rb', line 11

def empty?
  @stack.empty?
end

#pop ⇒ Object 



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# File 'lib/basic101/for_stack.rb', line 22

def pop
  @stack.pop
end

#push(statement) ⇒ Object 



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# File 'lib/basic101/for_stack.rb', line 15

def push(statement)
  if has_reference?(statement.reference)
    raise DuplicateReferenceInForStack
  end
  @stack.push statement
end

#top ⇒ Object 



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# File 'lib/basic101/for_stack.rb', line 26

def top
  @stack.last
end