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musicxml.cpp
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// Copyright (C) 2012 Mario Lang <mlang@delysid.org>
//
// Distributed under the terms of the GNU General Public License version 3.
// (see accompanying file LICENSE.txt or copy at
// http://www.gnu.org/licenses/gpl-3.0-standalone.html)
#include <xercesc/util/XMLString.hpp>
#include <xercesc/dom/DOM.hpp>
#include <xercesc/framework/StdOutFormatTarget.hpp>
#include <xercesc/framework/URLInputSource.hpp>
#include <xercesc/framework/Wrapper4InputSource.hpp>
#include <libxml/catalog.h>
#include <boost/assert.hpp>
#include <ctime>
#include <iostream>
#include <memory>
#include <vector>
namespace music { namespace musicxml {
class xml_string
{
XMLCh *transcoded;
public:
xml_string(char const * const string)
: transcoded(XERCES_CPP_NAMESPACE::XMLString::transcode(string))
{}
~xml_string() { XERCES_CPP_NAMESPACE::XMLString::release(&transcoded); }
operator XMLCh const *() const { return transcoded; }
};
class ostream_format_target: public XERCES_CPP_NAMESPACE::XMLFormatTarget
{
std::ostream& stream;
public:
ostream_format_target(std::ostream &stream): stream(stream) {}
virtual void writeChars( XMLByte const * const buffer, XMLSize_t const size
, xercesc::XMLFormatter* const
)
{
if (not stream.fail())
stream.write(reinterpret_cast<char const *>(buffer),
static_cast<std::streamsize>(size));
}
virtual void flush() { if (not stream.fail()) stream.flush(); }
};
/**
* \brief A deleter that uses the <code>release</code> member function to destroy
* an object.
*
* Xerces DOM objects have a reference counting mechanism where calling
* <code>release</code> on them decrements the reference counter.
*/
struct dom_deleter
{
template <class T>
void operator()(T* ptr)
{ if (ptr) ptr->release(); }
};
typedef std::unique_ptr<xercesc::DOMDocument, dom_deleter>
unique_dom_document_ptr;
typedef std::unique_ptr<xercesc::DOMLSParser, dom_deleter>
unique_dom_ls_parser_ptr;
typedef std::unique_ptr<xercesc::DOMLSSerializer, dom_deleter>
unique_dom_ls_serializer_ptr;
typedef std::unique_ptr<xercesc::DOMLSOutput, dom_deleter>
unique_dom_ls_output_ptr;
class catalog_resource_resolver : public XERCES_CPP_NAMESPACE::DOMLSResourceResolver
{
xmlCatalogPtr catalog;
public:
catalog_resource_resolver(char const * filename)
: catalog(xmlLoadACatalog(filename))
{}
~catalog_resource_resolver() { xmlFreeCatalog(catalog); }
XERCES_CPP_NAMESPACE::DOMLSInput*
resolveResource( XMLCh const * const /* resourceType */
, XMLCh const * const /* namespaceUri */
, XMLCh const * const publicId
, XMLCh const * const /* systemId */
, XMLCh const * const baseURI
)
{
char * pubId = XERCES_CPP_NAMESPACE::XMLString::transcode(publicId);
xmlChar const * newSystemId = xmlACatalogResolvePublic(catalog, reinterpret_cast<xmlChar const *>(pubId));
XERCES_CPP_NAMESPACE::XMLString::release(&pubId);
if (newSystemId) {
XERCES_CPP_NAMESPACE::URLInputSource
*input_source = new XERCES_CPP_NAMESPACE::URLInputSource
(baseURI,
XERCES_CPP_NAMESPACE::XMLString::transcode(reinterpret_cast<char const *>
(newSystemId)
),
publicId);
XERCES_CPP_NAMESPACE::DOMLSInput
*input = new XERCES_CPP_NAMESPACE::Wrapper4InputSource(input_source);
return input;
}
return nullptr;
}
};
class part;
class measure
{
friend class part;
XERCES_CPP_NAMESPACE::DOMElement *this_element;
measure(XERCES_CPP_NAMESPACE::DOMElement *element)
: this_element(element)
{}
};
class document;
class part
{
friend class document;
XERCES_CPP_NAMESPACE::DOMElement *this_element, *part_list;
std::vector<measure> measures;
part( XERCES_CPP_NAMESPACE::DOMElement *element
, XERCES_CPP_NAMESPACE::DOMElement *part_list
)
: this_element(element)
, part_list(part_list)
{
xml_string measure_tag_name("measure");
for (XERCES_CPP_NAMESPACE::DOMElement *
element = this_element->getFirstElementChild();
element != nullptr;
element = element->getNextElementSibling())
{
if (XERCES_CPP_NAMESPACE::XMLString::equals
(element->getTagName(), measure_tag_name)) {
measures.emplace_back(measure(element));
}
}
}
public:
~part() { this_element = part_list = nullptr; }
std::string id() const {
char *id_transcoded(XERCES_CPP_NAMESPACE::XMLString::transcode(this_element->getAttribute(xml_string("id"))));
std::string part_id(id_transcoded);
XERCES_CPP_NAMESPACE::XMLString::release(&id_transcoded);
return part_id;
}
std::string name() const {
XMLCh const *id_(this_element->getAttribute(xml_string("id")));
for (XERCES_CPP_NAMESPACE::DOMElement *
element = part_list->getFirstElementChild();
element != nullptr;
element = element->getNextElementSibling())
{
if (XERCES_CPP_NAMESPACE::XMLString::equals(element->getTagName(),
xml_string("score-part")) and
XERCES_CPP_NAMESPACE::XMLString::equals(element->getAttribute(xml_string("id")), id_))
{
for (XERCES_CPP_NAMESPACE::DOMElement *
score_part_element = element->getFirstElementChild();
score_part_element != nullptr;
score_part_element = score_part_element->getNextElementSibling())
{
if (XERCES_CPP_NAMESPACE::XMLString::equals(score_part_element->getTagName(), xml_string("part-name")))
{
char *text_content(XERCES_CPP_NAMESPACE::XMLString::transcode(score_part_element->getTextContent()));
std::string text(text_content);
XERCES_CPP_NAMESPACE::XMLString::release(&text_content);
return text;
}
}
}
}
return "";
}
};
class document
{
unique_dom_document_ptr dom_document;
XERCES_CPP_NAMESPACE::DOMElement *score_partwise, *identification, *part_list;
bool indent;
std::vector<part> partwise;
public:
document()
: dom_document(create_dom_document())
, score_partwise(dom_document->getDocumentElement())
, identification(create_identification())
, part_list(dom_document->createElement(xml_string("part-list")))
, indent(true)
{ initialize_empty_document(); }
static bool tag_name_equals( XERCES_CPP_NAMESPACE::DOMElement *element
, std::string const& name
)
{
return XERCES_CPP_NAMESPACE::XMLString::equals(element->getTagName(),
xml_string(name.c_str()));
}
document(char const *uri)
: dom_document(deserialize(uri))
, score_partwise(dom_document->getDocumentElement())
, identification(nullptr)
, part_list(nullptr)
, indent(false)
{
BOOST_ASSERT(tag_name_equals(score_partwise, "score-partwise"));
for (XERCES_CPP_NAMESPACE::DOMElement *
element = score_partwise->getFirstElementChild();
element != nullptr;
element = element->getNextElementSibling())
{
if (tag_name_equals(element, "identification")) {
identification = element;
} else if (tag_name_equals(element, "part-list")) {
part_list = element;
break;
}
}
BOOST_ASSERT(part_list != nullptr);
for (XERCES_CPP_NAMESPACE::DOMElement *
element = part_list->getNextElementSibling();
element != nullptr;
element = element->getNextElementSibling())
{
if (tag_name_equals(element, "part") and
element->hasAttribute(xml_string("id"))) {
partwise.emplace_back(part(element, part_list));
}
}
}
~document() { score_partwise = identification = part_list = nullptr; }
std::vector<part> const& parts() const { return partwise; }
private:
static XERCES_CPP_NAMESPACE::DOMDocument *create_dom_document()
{
XERCES_CPP_NAMESPACE::DOMImplementation
*dom(XERCES_CPP_NAMESPACE::
DOMImplementationRegistry::getDOMImplementation(xml_string("Core")));
if (dom) {
xml_string
score_type("score-partwise"),
dtd_public("-//Recordare//DTD MusicXML 3.0 Partwise//EN"),
dtd_url("http://www.musicxml.org/dtds/partwise.dtd");
return dom->createDocument(nullptr, score_type,
dom->createDocumentType(score_type,
dtd_public, dtd_url));
}
return nullptr;
}
void initialize_empty_document()
{
score_partwise->setAttribute(xml_string("version"), xml_string("3.0"));
score_partwise->appendChild(identification);
score_partwise->appendChild(part_list);
}
XERCES_CPP_NAMESPACE::DOMElement *create_identification() const
{
XERCES_CPP_NAMESPACE::DOMElement
*element(dom_document->createElement(xml_string("identification"))),
*encoding(dom_document->createElement(xml_string("encoding"))),
*software(dom_document->createElement(xml_string("software")));
encoding->appendChild(create_encoding_date());
software->appendChild(dom_document->createTextNode(xml_string("Braille Music Compiler")));
encoding->appendChild(software);
element->appendChild(encoding);
return element;
}
XERCES_CPP_NAMESPACE::DOMElement *create_encoding_date() const
{
XERCES_CPP_NAMESPACE::DOMElement
*element = dom_document->createElement(xml_string("encoding-date"));
char date_string[11];
std::time_t current_time = std::time(nullptr);
std::strftime(date_string, sizeof(date_string), "%Y-%m-%d",
std::localtime(¤t_time));
element->appendChild(dom_document->createTextNode(xml_string(date_string)));
return element;
}
public:
bool serialize(std::ostream& stream) const
{
XERCES_CPP_NAMESPACE_USE
try {
DOMImplementationLS
*ls = DOMImplementationRegistry::getDOMImplementation(xml_string("ls"));
unique_dom_ls_serializer_ptr serializer(ls->createLSSerializer());
if (indent) {
DOMConfiguration *configuration = serializer->getDomConfig();
if (configuration->canSetParameter(XMLUni::fgDOMWRTFormatPrettyPrint, true))
configuration->setParameter(XMLUni::fgDOMWRTFormatPrettyPrint, true);
}
unique_dom_ls_output_ptr output(ls->createLSOutput());
ostream_format_target ostream(stream);
output->setByteStream(&ostream);
return serializer->write(dom_document.get(), output.get());
} catch (XMLException& e) {
std::cerr << "An error occurred during creation of output transcoder. Msg is:"
<< std::endl
<< e.getMessage() << std::endl;
}
return false;
}
private:
static XERCES_CPP_NAMESPACE::DOMDocument *deserialize(char const *uri)
{
XERCES_CPP_NAMESPACE_USE
try {
DOMImplementationLS
*ls = DOMImplementationRegistry::getDOMImplementation(xml_string("ls"));
unique_dom_ls_parser_ptr
parser(ls->createLSParser(DOMImplementationLS::MODE_SYNCHRONOUS, 0));
catalog_resource_resolver resolver("/etc/xml/catalog");
{
DOMConfiguration *configuration = parser->getDomConfig();
if (configuration->canSetParameter(XMLUni::fgDOMResourceResolver, &resolver))
configuration->setParameter(XMLUni::fgDOMResourceResolver, &resolver);
if (configuration->canSetParameter(XMLUni::fgDOMValidate, true))
configuration->setParameter(XMLUni::fgDOMValidate, true);
}
return static_cast<XERCES_CPP_NAMESPACE::DOMDocument*>
( parser->parseURI(uri)->cloneNode(true) );
} catch (XMLException& e) {
std::cerr << "An error occurred during creation of output transcoder. Msg is:"
<< std::endl
<< e.getMessage() << std::endl;
}
return nullptr;
}
public:
friend std::ostream& operator<< (std::ostream& stream, document const& doc)
{
doc.serialize(stream);
return stream;
}
};
struct xerces_platform
{
xerces_platform() { XERCES_CPP_NAMESPACE::XMLPlatformUtils::Initialize(); }
~xerces_platform() { XERCES_CPP_NAMESPACE::XMLPlatformUtils::Terminate(); }
};
}}
#include <xercesc/util/PlatformUtils.hpp>
int main(int argc, char const *argv[])
{
music::musicxml::xerces_platform xerces;
if (argc == 1) {
music::musicxml::document musicxml;
std::cout << musicxml;
} else if (argc == 2) {
music::musicxml::document musicxml(argv[1]);
std::cout << musicxml.parts().size() << " parts" << std::endl;
for (auto part: musicxml.parts()) {
std::cout << "Part name: " << part.name() << std::endl;
}
std::cout << musicxml;
}
return EXIT_SUCCESS;
}