Class: Basic101::NextStatement

Inherits:
Statement show all
Defined in:
lib/basic101/next_statement.rb

Instance Attribute Summary

Attributes inherited from Statement

#index, #line

Instance Method Summary collapse

Methods inherited from Statement

#data_items, #exec, #line_number, #raise_error_with_line_number

Methods included from Identity

#==

Constructor Details

#initialize(reference) ⇒ NextStatement

Returns a new instance of NextStatement.



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# File 'lib/basic101/next_statement.rb', line 9

def initialize(reference)
  @reference = reference
end

Instance Method Details

#execute(runtime) ⇒ Object

Raises:



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# File 'lib/basic101/next_statement.rb', line 13

def execute(runtime) 
  for_statement = if @reference.nil?
                    runtime.for_stack.top
                  else
                    runtime.for_stack[@reference]
                  end
  raise NextWithoutFor unless for_statement
  for_statement.increment(runtime)
  if for_statement.done?(runtime)
    for_statement.delete_from_stack(runtime)
  else
    for_statement.goto_following_statement(runtime)
  end
end