ahem/lib/ahem/ast/for_loop.rb

class AST::ForLoop
  attr_reader :iterator, :iterable, :block

  def initialize(iterator, iterable, block)
    @iterator = iterator
    @iterable = iterable
    @block = block
  end

  def ==(other)
    other.is_a?(AST::ForLoop) && other.iterator == @iterator &&
      other.iterable == @iterable &&
      other.block == @block
  end

  def execute(env)
    @iterable.execute(env).each do |i|
      env.set(@iterator.name, i)
      @block.statements.each { |statement| statement.execute(env) }
    end
  end
end