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/**************************************************************************
* *
* Regina - A Normal Surface Theory Calculator *
* Computational Engine *
* *
* Copyright (c) 1999-2009, Ben Burton *
* For further details contact Ben Burton (bab@debian.org). *
* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License as *
* published by the Free Software Foundation; either version 2 of the *
* License, or (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details. *
* *
* You should have received a copy of the GNU General Public *
* License along with this program; if not, write to the Free *
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, *
* MA 02110-1301, USA. *
* *
**************************************************************************/
/* end stub */
#include <iomanip>
#include "file/nxmlcallback.h"
namespace regina {
const int NXMLCallback::WAITING = 1;
const int NXMLCallback::WORKING = 2;
const int NXMLCallback::DONE = 3;
const int NXMLCallback::ABORTED = 4;
NXMLCallback::~NXMLCallback() {
if (! readers.empty())
abort();
}
void NXMLCallback::start_document(regina::xml::XMLParser* parser) {
topReader.usingParser(parser);
}
void NXMLCallback::end_document() {
if (state == WAITING) {
errStream << "XML Fatal Error: File contains no tags." << std::endl;
abort();
} else if (state == WORKING || ! readers.empty()) {
errStream << "XML Fatal Error: Unfinished file." << std::endl;
abort();
}
}
void NXMLCallback::start_element(const std::string& n,
const regina::xml::XMLPropertyDict& p) {
if (state == DONE) {
errStream << "XML Fatal Error: File contains multiple top-level tags."
<< std::endl;
abort();
} else if (state == WAITING) {
currentReader()->startElement(n, p, 0);
currChars = "";
charsAreInitial = true;
state = WORKING;
} else if (state == WORKING) {
NXMLElementReader* current = currentReader();
if (charsAreInitial)
current->initialChars(currChars);
NXMLElementReader* child = current->startSubElement(n, p);
readers.push(child);
child->startElement(n, p, current);
currChars = "";
charsAreInitial = true;
}
}
void NXMLCallback::end_element(const std::string& n) {
if (state == WORKING) {
NXMLElementReader* current = currentReader();
if (charsAreInitial) {
charsAreInitial = false;
current->initialChars(currChars);
}
current->endElement();
if (readers.empty()) {
// In this case, current is the top-level reader.
state = DONE;
} else {
// In this case, current is at the top of the stack.
readers.pop();
currentReader()->endSubElement(n, current);
delete current;
}
}
}
void NXMLCallback::characters(const std::string& s) {
if (state == WORKING)
if (charsAreInitial)
currChars += s;
}
void NXMLCallback::warning(const std::string& s) {
errStream << "XML Warning: " << s << std::endl;
}
void NXMLCallback::error(const std::string& s) {
errStream << "XML Error: " << s << std::endl;
abort();
}
void NXMLCallback::fatal_error(const std::string& s) {
errStream << "XML Fatal Error: " << s << std::endl;
abort();
}
void NXMLCallback::abort() {
if (state == ABORTED)
return;
state = ABORTED;
// Make sure we don't delete a child reader until we've called
// abortElement() on its parent.
NXMLElementReader* child = 0;
while (! readers.empty()) {
readers.top()->abort(child);
if (child)
delete child;
child = readers.top();
readers.pop();
}
topReader.abort(child);
if (child)
delete child;
}
} // namespace regina
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