/usr/include/svgpp/document_traversal.hpp is in libsvgpp-dev 1.2.3+dfsg1-3ubuntu1.
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// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://github.com/svgpp/svgpp for library home page.
#pragma once
#include <svgpp/attribute_traversal/attribute_traversal.hpp>
#include <svgpp/attribute_dispatcher.hpp>
#include <svgpp/config.hpp>
#include <svgpp/factory/context.hpp>
#include <svgpp/template_parameters.hpp>
#include <svgpp/detail/element_id_to_tag.hpp>
#include <svgpp/policy/document_traversal_control.hpp>
#include <svgpp/policy/text_events.hpp>
#include <svgpp/traits/child_element_types.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/parameter.hpp>
#include <boost/static_assert.hpp>
#include <boost/preprocessor.hpp>
#include <boost/tti/member_type.hpp>
#include <boost/type_traits.hpp>
namespace svgpp
{
struct default_context_factories
{
template<class ParentContext, class ElementTag>
struct apply
{
typedef factory::context::same<ParentContext, ElementTag> type;
};
};
namespace detail
{
BOOST_TTI_MEMBER_TYPE(intercepted_exception_type)
struct dummy_exception {};
template<class ErrorPolicy, class ExceptionType, class XMLElement>
inline bool call_add_element_info(ExceptionType & e, XMLElement const & element)
{
return ErrorPolicy::add_element_info(e, element);
}
template<class ErrorPolicy, class XMLElement>
inline bool call_add_element_info(dummy_exception & e, XMLElement const &)
{
return true;
}
}
BOOST_PARAMETER_TEMPLATE_KEYWORD(context_factories)
BOOST_PARAMETER_TEMPLATE_KEYWORD(expected_elements)
BOOST_PARAMETER_TEMPLATE_KEYWORD(xml_element_policy)
BOOST_PARAMETER_TEMPLATE_KEYWORD(text_events_policy)
BOOST_PARAMETER_TEMPLATE_KEYWORD(ignored_elements)
BOOST_PARAMETER_TEMPLATE_KEYWORD(processed_elements)
BOOST_PARAMETER_TEMPLATE_KEYWORD(document_traversal_control_policy)
template<SVGPP_TEMPLATE_ARGS2_DEF>
class document_traversal
{
protected:
typedef typename boost::parameter::parameters<
boost::parameter::optional<tag::context_factories>
, boost::parameter::optional<tag::xml_element_policy>
, boost::parameter::optional<tag::text_events_policy>
, boost::parameter::optional<tag::error_policy>
, boost::parameter::optional<tag::ignored_elements, boost::mpl::is_sequence<boost::mpl::_> >
, boost::parameter::optional<tag::processed_elements, boost::mpl::is_sequence<boost::mpl::_> >
, boost::parameter::optional<tag::document_traversal_control_policy>
>::template bind<SVGPP_TEMPLATE_ARGS2_PASS>::type args;
typedef typename boost::parameter::value_type<args, tag::context_factories,
default_context_factories>::type context_factories;
typedef typename boost::parameter::value_type<args, tag::ignored_elements, void>::type ignored_elements;
typedef typename boost::parameter::value_type<args, tag::processed_elements, void>::type processed_elements;
BOOST_STATIC_ASSERT_MSG(boost::is_void<ignored_elements>::value
!= boost::is_void<processed_elements>::value, "Only one of ignored_elements and processed_elements must be set");
typedef typename
boost::mpl::if_<
boost::is_void<ignored_elements>,
boost::mpl::has_key<boost::mpl::protect<processed_elements>, boost::mpl::_1>,
boost::mpl::not_<boost::mpl::has_key<boost::mpl::protect<ignored_elements>, boost::mpl::_1> >
>::type is_element_processed;
public:
template<class XMLElement, class Context>
static bool load_document(XMLElement const & xml_element_svg, Context & context)
{
return load_expected_element(xml_element_svg, context, tag::element::svg());
}
template<class XMLElement, class Context, class ElementTag>
static bool load_expected_element(XMLElement const & xml_element, Context & context, ElementTag expected_element)
{
typedef typename boost::parameter::value_type<args, tag::xml_element_policy,
policy::xml::element_iterator<XMLElement> >::type xml_policy_t;
typedef typename boost::parameter::value_type<args, tag::error_policy,
policy::error::default_policy<Context> >::type error_policy;
typename xml_policy_t::element_name_type element_name = xml_policy_t::get_local_name(xml_element);
detail::element_type_id element_type_id = detail::element_name_to_id_dictionary::find(
xml_policy_t::get_string_range(element_name));
if (element_type_id != detail::unknown_element_type_id)
{
if (element_type_id == ElementTag::element_id)
return
load_element<
typename traits::child_element_types<ElementTag>::type,
void
>(xml_element, context, expected_element);
else
return error_policy::unexpected_element(context, xml_element);
}
else
return error_policy::unknown_element(context, xml_element, xml_policy_t::get_string_range(element_name));
}
template<class ExpectedChildElements, class ReferencingElement, class XMLElement, class Context, class ElementTag>
static bool load_element(XMLElement const & xml_element, Context & context, ElementTag element_tag)
{
#ifdef SVGPP_INTERCEPT_EXCEPTIONS
typedef typename boost::parameter::value_type<args, tag::error_policy,
policy::error::default_policy<Context> >::type error_policy;
try
#endif
{
typedef typename boost::parameter::value_type<args, tag::document_traversal_control_policy,
policy::document_traversal_control::default_policy<Context> >::type traversal_control_policy;
return load_attributes<ReferencingElement>(xml_element, context, element_tag)
&& (!traversal_control_policy::proceed_to_element_content(context)
|| load_element_content<ExpectedChildElements>(xml_element, context, element_tag));
}
#ifdef SVGPP_INTERCEPT_EXCEPTIONS
catch(typename detail::member_type_intercepted_exception_type<error_policy, detail::dummy_exception>::type & e)
{
return detail::call_add_element_info<error_policy>(e, xml_element);
}
#endif
}
template<class ReferencingElement, class XMLElement, class Context, class ElementTag>
static bool load_attributes(XMLElement const & xml_element, Context & context, ElementTag)
{
typedef typename boost::parameter::value_type<args, tag::xml_element_policy,
policy::xml::element_iterator<XMLElement> >::type xml_policy_t;
typedef typename dispatcher_detail::referencing_element_if_needed<
ReferencingElement,
ElementTag,
Context,
SVGPP_TEMPLATE_ARGS2_PASS
>::type referencing_element_tag;
typedef attribute_dispatcher<
ElementTag,
Context,
referencing_element<referencing_element_tag>,
SVGPP_TEMPLATE_ARGS2_PASS
> attribute_dispatcher_t;
attribute_dispatcher_t attribute_dispatcher(context);
if (!attribute_traversal<
ElementTag,
SVGPP_TEMPLATE_ARGS2_PASS
>::type::load(xml_policy_t::get_attributes(xml_element), attribute_dispatcher))
return false;
return attribute_dispatcher.on_exit_attributes();
}
template<class ExpectedChildElements, class ReferencingElement, class XMLElement, class ParentContext, class ElementTag>
static bool load_child_element(XMLElement const & xml_element, ParentContext & parent_context, ElementTag element_tag)
{
typedef typename context_factories::template apply<ParentContext, ElementTag>::type context_factory_t;
context_factory_t context_factory(parent_context, xml_element);
if (!load_element<ExpectedChildElements, ReferencingElement>(xml_element, context_factory.get(), element_tag))
return false;
context_factory.on_exit_element();
return true;
}
// TODO: Only if child elements or text nodes supported
template<class ExpectedChildElements, class XMLElement, class Context, class ElementTag>
static typename boost::enable_if<
boost::mpl::and_<
boost::mpl::empty<typename traits::child_element_types<ElementTag>::type>,
boost::mpl::not_<boost::mpl::has_key<ExpectedChildElements, tag::text_content> > >, bool>::type
load_element_content(XMLElement const &, Context const &, ElementTag)
{
return true;
}
template<class ExpectedChildElements, class XMLElement, class Context, class ElementTag>
static typename boost::disable_if<
boost::mpl::or_<
boost::mpl::empty<typename traits::child_element_types<ElementTag>::type>,
boost::mpl::has_key<ExpectedChildElements, tag::text_content> >, bool>::type
load_element_content(XMLElement const & xml_element, Context & context, ElementTag element_tag)
{
typedef typename boost::parameter::value_type<args, tag::xml_element_policy,
policy::xml::element_iterator<XMLElement> >::type xml_policy_t;
typedef typename boost::parameter::value_type<args, tag::error_policy,
policy::error::default_policy<Context> >::type error_policy;
typedef typename boost::parameter::value_type<args, tag::document_traversal_control_policy,
policy::document_traversal_control::default_policy<Context> >::type traversal_control_policy;
for(typename xml_policy_t::iterator_type xml_child_element = xml_policy_t::get_child_elements(xml_element);
!xml_policy_t::is_end(xml_child_element); xml_policy_t::advance_element(xml_child_element))
{
if (!load_child_xml_element<ExpectedChildElements, is_element_processed, void>(
xml_child_element, context, element_tag))
return false;
if (!traversal_control_policy::proceed_to_next_child(context))
break;
}
return true;
}
template<class ExpectedChildElements, class XMLElement, class Context, class ElementTag>
static typename boost::enable_if<boost::mpl::has_key<ExpectedChildElements, tag::text_content>, bool>::type
load_element_content(XMLElement const & xml_element, Context & context, ElementTag element_tag)
{
typedef typename boost::parameter::value_type<args, tag::xml_element_policy,
policy::xml::element_iterator<XMLElement> >::type xml_policy_t;
typedef typename boost::parameter::value_type<args, tag::text_events_policy,
policy::text_events::default_policy<Context> >::type text_events_policy;
typedef typename boost::parameter::value_type<args, tag::document_traversal_control_policy,
policy::document_traversal_control::default_policy<Context> >::type traversal_control_policy;
for(typename xml_policy_t::iterator_type xml_child_element = xml_policy_t::get_child_elements_and_texts(xml_element);
!xml_policy_t::is_end(xml_child_element); xml_policy_t::advance_element_or_text(xml_child_element))
{
if (xml_policy_t::is_text(xml_child_element))
{
typename xml_policy_t::element_text_type text = xml_policy_t::get_text(xml_child_element);
text_events_policy::set_text(context, xml_policy_t::get_string_range(text));
}
else
{
if (traversal_control_policy::process_child(context, xml_child_element))
if (!load_child_xml_element<ExpectedChildElements, is_element_processed, void>(
xml_child_element, context, element_tag))
return false;
}
if (!traversal_control_policy::proceed_to_next_child(context))
break;
}
return true;
}
template<BOOST_PP_ENUM_BINARY_PARAMS(6, class ArgRef, = boost::parameter::void_ BOOST_PP_INTERCEPT)>
struct load_referenced_element
{
// struct is needed just because in C++03 function default template parameters are not supported
template<class XMLElement, class Context>
static bool load(XMLElement const & xml_element, Context & parent_context)
{
typedef typename boost::parameter::parameters<
boost::parameter::optional<tag::referencing_element, boost::is_base_of<tag::element::any, boost::mpl::_> >
, boost::parameter::required<tag::expected_elements, boost::mpl::is_sequence<boost::mpl::_> >
, boost::parameter::optional<tag::ignored_elements, boost::mpl::is_sequence<boost::mpl::_> >
, boost::parameter::optional<tag::processed_elements, boost::mpl::is_sequence<boost::mpl::_> >
>::template bind<BOOST_PP_ENUM_PARAMS(6, ArgRef)>::type args;
typedef typename boost::parameter::value_type<args, tag::referencing_element, void>::type referencing_element;
typedef typename boost::parameter::value_type<args, tag::expected_elements>::type expected_elements;
typedef typename boost::parameter::value_type<args, tag::ignored_elements, void>::type ignored_elements;
typedef typename boost::parameter::value_type<args, tag::processed_elements, void>::type processed_elements;
BOOST_STATIC_ASSERT_MSG(boost::is_void<ignored_elements>::value
|| boost::is_void<processed_elements>::value, "Only one of ignored_elements and processed_elements may be set");
// Elements other than ExpectedElements will cause unexpected_element error
// If neither ignored_elements nor processed_elements are set then expected_elements treated as processed_elements
typedef typename
boost::mpl::if_<
boost::is_void<processed_elements>,
typename boost::mpl::if_<
boost::is_void<ignored_elements>,
boost::mpl::has_key<boost::mpl::protect<expected_elements>, boost::mpl::_1>,
boost::mpl::not_<boost::mpl::has_key<boost::mpl::protect<ignored_elements>, boost::mpl::_1> >
>::type,
boost::mpl::has_key<boost::mpl::protect<processed_elements>, boost::mpl::_1>
>::type is_element_processed;
// The 'a' element may contain any element that its parent may contain, except itself.
// So we can't handle 'a' without knowing its parent.
BOOST_MPL_ASSERT_NOT((boost::mpl::has_key<expected_elements, tag::element::a>));
// TODO: Pass ReferencingElement only when needed, to reduce number of instantiations
return load_child_xml_element<
expected_elements,
is_element_processed,
referencing_element
>(xml_element, parent_context,
boost::mpl::void_()); // ParentElementTag parameter can be of any type, it shouldn't be used for
// any element except 'a'
}
};
protected:
template<
class XMLElement,
class Context,
class IsElementProcessed,
class ParentElementTag,
class ReferencingElement
>
class load_element_functor: boost::noncopyable
{
public:
load_element_functor(XMLElement const & xml_element, Context & context)
: xml_element_(xml_element)
, context_(context)
, result_(true)
{
}
template<class ElementTag>
typename boost::enable_if_c<
!boost::is_same<ElementTag, tag::element::a>::value
&& boost::mpl::apply<IsElementProcessed, ElementTag>::type::value
>::type operator()(ElementTag tag)
{
result_ = document_traversal::load_child_element<
typename traits::child_element_types<ElementTag>::type,
ReferencingElement
>(xml_element_, context_, tag);
}
template<class ElementTag>
typename boost::enable_if_c<
boost::is_same<ElementTag, tag::element::a>::value
&& boost::mpl::apply<IsElementProcessed, ElementTag>::type::value
>::type operator()(ElementTag tag)
{
// The 'a' element may contain any element that its parent may contain, except itself.
// Removing 'a' itself from list of permitted child types
result_ = document_traversal::load_child_element<
typename boost::mpl::erase_key<
typename traits::child_element_types<ParentElementTag>::type,
tag::element::a
>::type,
ReferencingElement
>(xml_element_, context_, tag);
}
template<class ElementTag>
typename boost::disable_if<typename boost::mpl::apply<IsElementProcessed, ElementTag>::type>::type
operator()(ElementTag) const
{}
bool succeeded() const
{
return result_;
}
private:
XMLElement const & xml_element_;
Context & context_;
bool result_;
};
template<
class ExpectedElements,
class IsElementProcessed,
class ReferencingElement,
class XMLElement,
class Context,
class ParentElementTag
>
static bool load_child_xml_element(XMLElement const & xml_element, Context & parent_context, ParentElementTag)
{
typedef typename boost::parameter::value_type<args, tag::xml_element_policy,
policy::xml::element_iterator<XMLElement> >::type xml_policy_t;
typedef typename boost::parameter::value_type<args, tag::error_policy,
policy::error::default_policy<Context> >::type error_policy;
typename xml_policy_t::element_name_type element_name = xml_policy_t::get_local_name(xml_element);
detail::element_type_id element_type_id = detail::element_name_to_id_dictionary::find(
xml_policy_t::get_string_range(element_name));
if (element_type_id != detail::unknown_element_type_id)
{
load_element_functor<XMLElement, Context, IsElementProcessed, ParentElementTag, ReferencingElement> load_functor
(xml_element, parent_context);
if (detail::id_to_element_tag<ExpectedElements>(element_type_id, load_functor))
return load_functor.succeeded();
else
return error_policy::unexpected_element(parent_context, xml_element);
}
else
return error_policy::unknown_element(parent_context, xml_element, xml_policy_t::get_string_range(element_name));
}
};
}
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