def visit_for(node)
from = node.from.perform(@environment)
to = node.to.perform(@environment)
from.assert_int!
to.assert_int!
to = to.coerce(from.numerator_units, from.denominator_units)
direction = from.to_i > to.to_i ? -1 : 1
range = Range.new(direction * from.to_i, direction * to.to_i, node.exclusive)
with_environment Sass::SemiGlobalEnvironment.new(@environment) do
range.map do |i|
@environment.set_local_var(node.var,
Sass::Script::Value::Number.new(direction * i,
from.numerator_units, from.denominator_units))
node.children.map {|c| visit(c)}
end.flatten
end
end