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// file : examples/cxx/parser/polyroot/driver.cxx
// copyright : not copyrighted - public domain
#include <iostream>
#include "supermen-pskel.hxx" // Get the configuration macros (XSDE_*).
#if defined(XSDE_REUSE_STYLE_MIXIN)
# include "supermen-pimpl-mixin.hxx"
#elif defined(XSDE_REUSE_STYLE_TIEIN)
# include "supermen-pimpl-tiein.hxx"
#else
# error this example requires mixin or tiein parser reuse support
#endif
using std::cerr;
using std::endl;
using xml_schema::ro_string;
// Customize the xml_schema::document object to handle polymorphic
// root element. For more information see the multiroot example.
//
class document_pimpl: public xml_schema::document_pimpl
{
public:
// Passing the root element name to xml_schema::document_pimpl
// constructor indicates that we are doing polymorphic parsing.
// The root element name is used to automatically translate
// substitutions to type information.
//
document_pimpl (xml_schema::parser_map& parser_map)
: xml_schema::document_pimpl ("person"),
parser_map_ (parser_map),
parser_used_ (0)
{
}
protected:
// This function is called to obtain the root element type parser.
// If the returned pointer is 0 then the whole document content
// is ignored. The type argument contains the XML Schema type
// if xsi:type attribute or an element that substitutes the root
// was specified and 0 otherwise.
//
virtual xml_schema::parser_base*
start_root_element (const ro_string& ns,
const ro_string& name,
const char* type)
{
if (name != "person" || !ns.empty ())
{
// If the runtime and the generated code are built with
// validation enabled then we can also set an XML Schema
// error.
//
#ifdef XSDE_PARSER_VALIDATION
context_.schema_error (
xml_schema::parser_schema_error::unexpected_element);
#endif
return 0;
}
// Search the parser map. If type is 0 then there is no xsi:type and
// static type should be used.
//
xml_schema::parser_base* p = parser_map_.find (
type ? type : person_pskel::_static_type ());
if (p != 0)
{
// The map returns a generic parser_base which we will cast to
// person_pskel in order to call the pre() and post_person()
// callbacks. If the runtime and the generated code are built
// with the mixin parser reuse style then we have to use
// dynamic_cast because of the virtual inheritance.
//
#ifdef XSDE_REUSE_STYLE_MIXIN
parser_used_ = dynamic_cast<person_pskel*> (p);
#else
parser_used_ = static_cast<person_pskel*> (p);
#endif
parser_used_->pre ();
}
else
{
// No parser for this type. We could also make this an error
// by calling the schema_error() function as above.
//
parser_used_ = 0;
}
return p;
}
// This function is called to indicate the completion of document
// parsing. The parser argument contains the pointer returned by
// start_root_element.
//
virtual void
end_root_element (const ro_string& /* ns */,
const ro_string& /* name */,
xml_schema::parser_base* /* parser */)
{
// Instead of caching the current parser in parser_used_, we
// could also cast the parser argument to the person_pskel
// type.
//
if (parser_used_)
parser_used_->post_person ();
}
public:
// If we need to be able to reset and reuse the parser after
// an error then we also need to override reset() and reset
// the parser that was used last. Note that you always need
// to call _reset() from the base.
//
virtual void
reset ()
{
xml_schema::document_pimpl::reset ();
if (parser_used_)
parser_used_->_reset ();
}
private:
xml_schema::parser_map& parser_map_;
person_pskel* parser_used_;
};
int
main (int argc, char* argv[])
{
// Check that the load in substitution and inheritance hashmaps
// is not too high.
//
#ifndef NDEBUG
float load = (float) xml_schema::parser_smap_elements ();
load /= xml_schema::parser_smap_buckets ();
if (load > 0.8)
{
cerr << "substitution hashmap load is " << load << endl;
cerr << "time to increase XSDE_PARSER_SMAP_BUCKETS" << endl;
}
#ifdef XSDE_PARSER_VALIDATION
load = (float) xml_schema::parser_imap_elements ();
load /= xml_schema::parser_imap_buckets ();
if (load > 0.8)
{
cerr << "inheritance hashmap load is " << load << endl;
cerr << "time to increase XSDE_PARSER_IMAP_BUCKETS" << endl;
}
#endif
#endif
const char* input;
if (argc < 2)
{
input = "STDIN";
cerr << "XML file not specified, reading from STDIN" << endl;
}
else
input = argv[1];
try
{
// Construct the parser.
//
xml_schema::string_pimpl string_p;
xml_schema::boolean_pimpl boolean_p;
xml_schema::unsigned_int_pimpl unsigned_int_p;
person_pimpl person_p;
superman_pimpl superman_p;
batman_pimpl batman_p;
person_p.parsers (string_p);
superman_p.parsers (string_p, boolean_p);
batman_p.parsers (string_p, boolean_p, unsigned_int_p);
// Parse the XML document.
//
xml_schema::parser_map_impl person_map (5); // 5 hashtable buckets
person_map.insert (person_p);
person_map.insert (superman_p);
person_map.insert (batman_p);
document_pimpl doc_p (person_map);
// pre() and post() will be called as part of the start_root_element()
// and end_root_element() calls.
//
if (argc < 2)
doc_p.parse (std::cin);
else
doc_p.parse (argv[1]);
}
catch (const xml_schema::parser_exception& e)
{
cerr << input << ":" << e.line () << ":" << e.column () << ": "
<< e.text () << endl;
return 1;
}
catch (const std::ios_base::failure&)
{
cerr << input << ": unable to open or read failure" << endl;
return 1;
}
}
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