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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 <cstdarg>
#include <iostream>
#include <libxml/parserInternals.h>
#include "file/xml/xmlreader.h"
#define ERROR_BUFF_SIZE 1024
namespace regina::xml {
const std::string XMLPropertyDict::empty_;
XMLParser::XMLParser(XMLParserCallback& callback) : _parser_callback(callback) {
xmlSAXHandler sax_handler = {
nullptr, // internalSubset
nullptr, // isStandalone
nullptr, // hasInternalSubset
nullptr, // hasExternalSubset
nullptr, // resolveEntity
_get_entity, // getEntity
nullptr, // entityDecl
nullptr, // notationDecl
nullptr, // attributeDecl
nullptr, // elementDecl
nullptr, // unparsedEntityDecl
nullptr, // setDocumentLocator
_start_document, // startDocument
_end_document, // endDocument
_start_element, // startElement
_end_element, // endElement
nullptr, // reference
_characters, // characters
nullptr, // ignorableWhitespace
nullptr, // processingInstruction
_comment, // comment
_warning, // warning
_error, // error
_fatal_error, // fatalError
nullptr, // getParameterEntity
nullptr, // cdataBlock
nullptr, // externalSubset
1 // initialized
};
_context = xmlCreatePushParserCtxt(&sax_handler, this, nullptr, 0, nullptr);
// Ensure that entities in attributes are replaced.
_context->replaceEntities = 1;
}
xmlEntityPtr XMLParser::_get_entity(void*, const xmlChar* n) {
return xmlGetPredefinedEntity(n);
}
void XMLParser::_start_document(void* parser) {
static_cast<XMLParser*>(parser)->_parser_callback.start_document(
static_cast<XMLParser*>(parser));
}
void XMLParser::_end_document(void* parser) {
static_cast<XMLParser*>(parser)->_parser_callback.end_document();
}
void XMLParser::_start_element(void* parser, const xmlChar* n,
const xmlChar** p) {
XMLPropertyDict properties;
if (p) {
const xmlChar** cur = p;
const char* name;
const char* value;
while (cur && *cur) {
name = (const char*)(*cur++);
value = (const char*)(*cur++);
properties[name] = value;
}
}
static_cast<XMLParser*>(parser)->_parser_callback.start_element(
(const char*)(n), properties);
}
void XMLParser::_end_element(void* parser, const xmlChar* n) {
static_cast<XMLParser*>(parser)->_parser_callback.end_element(
(const char*)(n));
}
void XMLParser::_characters(void* parser, const xmlChar* s, int len) {
static_cast<XMLParser*>(parser)->_parser_callback.characters(
std::string((const char*)(s), len));
}
void XMLParser::_comment(void* parser, const xmlChar* s) {
static_cast<XMLParser*>(parser)->_parser_callback.comment(
(const char*)(s));
}
void XMLParser::_warning(void* parser, const char* fmt, ...) {
va_list arg;
char buff[ERROR_BUFF_SIZE];
va_start(arg, fmt);
vsnprintf(buff, ERROR_BUFF_SIZE, fmt, arg);
va_end(arg);
static_cast<XMLParser*>(parser)->_parser_callback.warning(buff);
}
void XMLParser::_error(void* parser, const char* fmt, ...) {
va_list arg;
char buff[ERROR_BUFF_SIZE];
va_start(arg, fmt);
vsnprintf(buff, ERROR_BUFF_SIZE, fmt, arg);
va_end(arg);
static_cast<XMLParser*>(parser)->_parser_callback.error(buff);
}
void XMLParser::_fatal_error(void* parser, const char* fmt, ...) {
va_list arg;
char buff[ERROR_BUFF_SIZE];
va_start(arg, fmt);
vsnprintf(buff, ERROR_BUFF_SIZE, fmt, arg);
va_end(arg);
static_cast<XMLParser*>(parser)->_parser_callback.fatal_error(buff);
}
void XMLParser::parse_stream(XMLParserCallback& callback, std::istream& file,
unsigned chunkSize) {
XMLParser parser(callback);
char* buf = new char[chunkSize];
unsigned chunkRead;
while (true) {
// Read in the next chunk.
for (chunkRead = 0; chunkRead < chunkSize; chunkRead++) {
int c = file.get();
if (c == EOF)
break;
else
buf[chunkRead] = static_cast<char>(c);
}
if (chunkRead == 0)
break;
parser.parse_chunk(std::string(buf, chunkRead));
}
parser.finish();
delete[] buf;
}
} // namespace regina::xml
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