inline static bool
center_generate(OutputIterator& sink, Context& ctx,
Delimiter const& d, Parameter const& param, Embedded const& e,
unsigned int const width, Padding const& p)
{
// make sure all generator parameters are valid
BOOST_MPL_ASSERT_MSG(
(spirit::traits::is_component<karma::domain, Embedded>::value),
embedded_is_not_convertible_to_a_generator, (Context, Embedded));
BOOST_MPL_ASSERT_MSG(
(spirit::traits::is_component<karma::domain, Padding>::value),
padding_is_not_convertible_to_a_generator, (Context, Padding));
typedef
typename result_of::as_component<karma::domain, Embedded>::type
embedded;
typedef
typename result_of::as_component<karma::domain, Padding>::type
padding;
// wrap the given output iterator to allow left padding
detail::enable_buffering<OutputIterator> buffering(sink, width);
// first generate the embedded output
embedded ec = spirit::as_component(karma::domain(), e);
typedef typename embedded::director director;
bool r = director::generate(ec, sink, ctx, d, param);
buffering.disable(); // do not perform buffering any more
// generate the left padding
detail::enable_counting<OutputIterator>
counting(sink, (sink.buffer_size() + width) / 2);
padding pc = spirit::as_component(karma::domain(), p);
typedef typename padding::director padding_director;
while (r && sink.count() < width)
r = padding_director::generate(pc, sink, ctx, unused, unused);
if (r) {
// copy the embedded output to the target output iterator
sink.buffer_copy();
// generate the right padding
std::size_t const max_count = width + (width - sink.buffer_size()) / 2;
while (r && sink.count() < max_count)
r = padding_director::generate(pc, sink, ctx, unused, unused);
}
return r;
}
inline static bool
left_align_generate(OutputIterator& sink, Context& ctx,
Delimiter const& d, Parameter const& param, Embedded const& e,
unsigned int const width, Padding const& p)
{
// make sure all generator parameters are valid
BOOST_MPL_ASSERT_MSG(
(spirit::traits::is_component<karma::domain, Embedded>::value),
embedded_is_not_convertible_to_a_generator, (Context, Embedded));
BOOST_MPL_ASSERT_MSG(
(spirit::traits::is_component<karma::domain, Padding>::value),
padding_is_not_convertible_to_a_generator, (Context, Padding));
typedef
typename result_of::as_component<karma::domain, Embedded>::type
embedded;
typedef
typename result_of::as_component<karma::domain, Padding>::type
padding;
// wrap the given output iterator to allow counting
detail::enable_counting<OutputIterator> counting(sink);
// first generate the underlying output
embedded ec = spirit::as_component(karma::domain(), e);
typedef typename embedded::director director;
bool r = director::generate(ec, sink, ctx, d, param);
// pad the output until the max width is reached
padding pc = spirit::as_component(karma::domain(), p);
while(r && sink.count() < width) {
typedef typename padding::director padding_director;
r = padding_director::generate(pc, sink, ctx, unused, unused);
}
return r;
}