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/* This file is part of Strigi Desktop Search
*
* Copyright (C) 2007 Jos van den Oever <jos@vandenoever.info>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "saxeventanalyzer.h"
#include <strigi/streamsaxanalyzer.h>
#include <strigi/analysisresult.h>
#include <strigi/textutils.h>
#include <libxml/SAX2.h>
#include <iostream>
#include <cassert>
#include <cstring>
#ifndef LIBXML_THREAD_ENABLED
#error Strigi needs a thread safe version of libxml2
#endif
using namespace Strigi;
using namespace std;
class xmlCleaner {
public:
~xmlCleaner() {
xmlCleanupParser();
}
};
static xmlCleaner xmlcleaner;
class SaxEventAnalyzer::Private {
public:
std::vector<StreamSaxAnalyzer*> sax;
xmlParserCtxtPtr ctxt;
xmlSAXHandler handler;
AnalysisResult* result;
bool error;
static void charactersSAXFunc(void* ctx, const xmlChar * ch, int len);
static void errorSAXFunc(void* ctx, const char * msg, ...);
static void startElementNsSAX2Func(void * ctx,
const xmlChar* localname, const xmlChar* prefix, const xmlChar* URI,
int nb_namespaces, const xmlChar ** namespaces, int nb_attributes,
int nb_defaulted, const xmlChar ** attributes);
static void endElementNsSAX2Func(void *ctx,
const xmlChar *localname, const xmlChar *prefix, const xmlChar *URI);
Private(std::vector<StreamSaxAnalyzer*>& s) :sax(s) {
ctxt = 0;
memset(&handler, 0, sizeof(xmlSAXHandler));
handler.initialized = XML_SAX2_MAGIC;
handler.characters = charactersSAXFunc;
handler.error = errorSAXFunc;
handler.startElementNs = startElementNsSAX2Func;
handler.endElementNs = endElementNsSAX2Func;
}
~Private() {
vector<StreamSaxAnalyzer*>::iterator s;
for (s = sax.begin(); s != sax.end(); ++s) {
delete *s;
}
if (ctxt) {
xmlFreeParserCtxt(ctxt);
}
}
void init(const char* data, int32_t len) {
error = false;
int initlen = (512 > len) ?len :512;
const char* name = result->fileName().c_str();
xmlKeepBlanksDefault(0);
if (ctxt) {
xmlCtxtResetPush(ctxt, data, initlen, name, 0);
} else {
ctxt = xmlCreatePushParserCtxt(&handler, this, data, initlen, name);
}
if (ctxt == 0) {
error = true;
} else if (len > initlen) {
push(data + initlen, len - initlen);
}
}
void push(const char* data, int32_t len) {
if (xmlParseChunk(ctxt, data, len, 0)) {
error = true;
}
}
void finish() {
if (xmlParseChunk(ctxt, 0, 0, 1)) {
error = true;
}
}
};
void
SaxEventAnalyzer::Private::charactersSAXFunc(void* ctx, const xmlChar* ch,
int len) {
Private* p = (Private*)ctx;
vector<StreamSaxAnalyzer*>::iterator i;
for (i = p->sax.begin(); i != p->sax.end(); ++i) {
(*i)->characters((const char*)ch, len);
}
}
void
SaxEventAnalyzer::Private::errorSAXFunc(void* ctx, const char* msg, ...) {
Private* p = (Private*)ctx;
p->error = true;
string e;
va_list args;
va_start(args, msg);
e += string(" ")+va_arg(args,char*);
va_end(args);
}
void
SaxEventAnalyzer::Private::startElementNsSAX2Func(void * ctx,
const xmlChar* localname, const xmlChar* prefix, const xmlChar* URI,
int nb_namespaces, const xmlChar ** namespaces, int nb_attributes,
int nb_defaulted, const xmlChar ** attributes) {
Private* p = (Private*)ctx;
vector<StreamSaxAnalyzer*>::iterator i;
for (i = p->sax.begin(); i != p->sax.end(); ++i) {
(*i)->startElement((const char*)localname, (const char*)prefix,
(const char*)URI, nb_namespaces, (const char**)namespaces,
nb_attributes, nb_defaulted, (const char**)attributes);
}
}
void
SaxEventAnalyzer::Private::endElementNsSAX2Func(void *ctx,
const xmlChar *localname, const xmlChar *prefix, const xmlChar *URI) {
Private *p = (Private *) ctx;
vector<StreamSaxAnalyzer *>::iterator i;
for (i = p->sax.begin(); i != p->sax.end(); ++i) {
(*i)->endElement((const char *) localname, (const char *) prefix,
(const char *) URI);
}
}
SaxEventAnalyzer::SaxEventAnalyzer(std::vector<StreamSaxAnalyzer*>& s)
:p(new Private(s)), ready(true) {
}
SaxEventAnalyzer::~SaxEventAnalyzer() {
delete p;
}
void
SaxEventAnalyzer::startAnalysis(AnalysisResult* result) {
p->result = result;
ready = false;
initialized = false;
vector<StreamSaxAnalyzer*>::iterator i;
for (i = p->sax.begin(); i != p->sax.end(); ++i) {
(*i)->startAnalysis(p->result);
}
}
void
SaxEventAnalyzer::endAnalysis(bool complete) {
vector<StreamSaxAnalyzer*>::iterator i;
for (i = p->sax.begin(); i != p->sax.end(); ++i) {
(*i)->endAnalysis(complete);
}
}
void
SaxEventAnalyzer::handleData(const char* data, uint32_t length) {
if (ready) return;
// push the data into the parser
if (!initialized) {
p->init(data, length);
initialized = true;
} else {
p->push(data, length);
}
// check if we are done
bool more = false;
if (!p->error) {
vector<StreamSaxAnalyzer*>::iterator i;
for (i = p->sax.begin(); i != p->sax.end(); ++i) {
more = more || !(*i)->isReadyWithStream();
}
}
ready = !more;
}
bool
SaxEventAnalyzer::isReadyWithStream() {
return ready;
}
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