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/**************************************************************************
* *
* Regina - A Normal Surface Theory Calculator *
* Computational Engine *
* *
* Copyright (c) 1999-2025, 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. *
* *
* As an exception, when this program is distributed through (i) the *
* App Store by Apple Inc.; (ii) the Mac App Store by Apple Inc.; or *
* (iii) Google Play by Google Inc., then that store may impose any *
* digital rights management, device limits and/or redistribution *
* restrictions that are required by its terms of service. *
* *
* 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, see <https://www.gnu.org/licenses/>. *
* *
**************************************************************************/
#include <iomanip>
#include "file/xml/xmlcallback.h"
namespace regina {
XMLCallback::~XMLCallback() {
if (! readers_.empty())
abort();
}
void XMLCallback::start_document(regina::xml::XMLParser* parser) {
topReader_.usingParser(parser);
}
void XMLCallback::end_document() {
if (state_ == State::Waiting) {
errStream_ << "XML Fatal Error: File contains no tags." << std::endl;
abort();
} else if (state_ == State::Working || ! readers_.empty()) {
errStream_ << "XML Fatal Error: Unfinished file." << std::endl;
abort();
}
}
void XMLCallback::start_element(const std::string& n,
const regina::xml::XMLPropertyDict& p) {
if (state_ == State::Done) {
errStream_ << "XML Fatal Error: File contains multiple top-level tags."
<< std::endl;
abort();
} else if (state_ == State::Waiting) {
currentReader()->startElement(n, p, nullptr);
currChars_ = "";
charsAreInitial_ = true;
state_ = State::Working;
} else if (state_ == State::Working) {
XMLElementReader* current = currentReader();
if (charsAreInitial_)
current->initialChars(currChars_);
XMLElementReader* child = current->startSubElement(n, p);
readers_.push(child);
child->startElement(n, p, current);
currChars_ = "";
charsAreInitial_ = true;
}
}
void XMLCallback::end_element(const std::string& n) {
if (state_ == State::Working) {
XMLElementReader* current = currentReader();
if (charsAreInitial_) {
charsAreInitial_ = false;
current->initialChars(currChars_);
}
current->endElement();
if (readers_.empty()) {
// In this case, current is the top-level reader.
state_ = State::Done;
} else {
// In this case, current is at the top of the stack.
readers_.pop();
currentReader()->endSubElement(n, current);
delete current;
}
}
}
void XMLCallback::characters(const std::string& s) {
if (state_ == State::Working)
if (charsAreInitial_)
currChars_ += s;
}
void XMLCallback::warning(const std::string& s) {
errStream_ << "XML Warning: " << s << std::endl;
}
void XMLCallback::error(const std::string& s) {
errStream_ << "XML Error: " << s << std::endl;
abort();
}
void XMLCallback::fatal_error(const std::string& s) {
errStream_ << "XML Fatal Error: " << s << std::endl;
abort();
}
void XMLCallback::abort() {
if (state_ == State::Aborted)
return;
state_ = State::Aborted;
// Make sure we don't delete a child reader until we've called
// abortElement() on its parent.
XMLElementReader* child = nullptr;
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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