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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* saxparser.cc
*
* Mon Mar 24 14:40:15 CET 2008
* Copyright 2008 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of Pracro.
*
* Pracro 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.
*
* Pracro 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 Pracro; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "saxparser.h"
static void character_hndl(void *p, const XML_Char *s, int len)
{
SAXParser *parser = (SAXParser*)XML_GetUserData(p);
std::string chars;
chars.append(s, len);
parser->characterData(chars);
}
static void start_hndl(void *p, const char *el, const char **attr)
{
SAXParser *parser = (SAXParser*)XML_GetUserData(p);
// Convert to comfy C++ values...
std::string name = el;
std::map< std::string, std::string > attributes;
while(*attr) {
std::string at_name = *attr;
attr++;
std::string at_value = *attr;
attr++;
attributes.insert(make_pair(at_name, at_value));
}
if(parser->outertag == "") parser->outertag = name;
parser->startTag(name, attributes);
}
static void end_hndl(void *p, const char *el)
{
SAXParser *parser = (SAXParser*)XML_GetUserData(p);
std::string name = el;
if(name == parser->outertag) parser->done = true;
parser->endTag(name);
}
SAXParser::SAXParser()
{
p = XML_ParserCreate(NULL);
if(!p) {
fprintf(stderr, "Couldn't allocate memory for parser\n");
// throw Exception(...);
return;
}
XML_SetUserData(p, this);
XML_UseParserAsHandlerArg(p);
XML_SetElementHandler(p, start_hndl, end_hndl);
XML_SetCharacterDataHandler(p, character_hndl);
bufferbytes = 0;
totalbytes = 0;
done = false;
}
SAXParser::~SAXParser()
{
XML_ParserFree(p);
}
int SAXParser::parse()
{
char buf[32];
int len;
do {
len = readData(buf, sizeof(buf) - 1);
if (! XML_Parse(p, buf, len, len == 0)) {
parseError(buf, len, XML_ErrorString(XML_GetErrorCode(p)), (int)XML_GetCurrentLineNumber(p));
return 1;
}
memset(buf, 0, sizeof(buf));
} while(len);
return 0;
}
bool SAXParser::parse(char *data, size_t size)
{
bufferbytes = size;
totalbytes += bufferbytes;
if(! XML_Parse(p, data, size, false) ) {
if(XML_GetErrorCode(p) == XML_ERROR_JUNK_AFTER_DOC_ELEMENT) return true;
parseError(data, size, XML_ErrorString(XML_GetErrorCode(p)), (int)XML_GetCurrentLineNumber(p));
return false;
}
if(done) {
if(! XML_Parse(p, data, 0, true) ) {
if(XML_GetErrorCode(p) == XML_ERROR_JUNK_AFTER_DOC_ELEMENT) return true;
parseError(data, 0, XML_ErrorString(XML_GetErrorCode(p)), (int)XML_GetCurrentLineNumber(p));
return false;
}
}
printf("Got END_OF_DOCUMENT [%s] at %ld\n", outertag.c_str(), XML_GetCurrentByteIndex(p));
return done;
}
void SAXParser::parseError(char *buf, size_t len, std::string error, int lineno)
{
fprintf(stderr, "SAXParser error at line %d: %s\n", lineno, error.c_str());
fprintf(stderr, "\tBuffer %u bytes: [", len);
if(fwrite(buf, len, 1, stderr) != len) {}
fprintf(stderr, "]\n");
fflush(stderr);
}
unsigned int SAXParser::usedBytes()
{
return bufferbytes + (XML_GetCurrentByteIndex(p) - totalbytes);
}
#ifdef TEST_SAXPARSER
/**
* Compile with: g++ -DTEST_SAXPARSER sax_parser.cc -lexpat -otext_saxparser
* Run with: ./test_saxparser [xmlfile]
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
class MyParser :public SAXParser {
public:
MyParser(char *file) {
fd = open(file, O_RDONLY);
}
int readData(char *data, size_t size) {
return read(fd, data, size);
}
void startTag(std::string name, std::map< std::string, std::string> attributes)
{
printf("<%s>\n", name.c_str());
}
private:
int fd;
};
int main(int argc, char *argv[]) {
if(argc < 2) return 1;
MyParser parser(argv[1]);
parser.parse();
}
#endif/*TEST_SAXPARSER*/
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