bool LightgrepController::addScanner(PatternScanner& scanner) {
LG_Error* lgErr = 0;
unsigned int patBegin = numeric_limits<unsigned int>::max(),
patEnd = 0;
int idx = -1;
for (vector<const Handler*>::const_iterator h(scanner.handlers().begin()); h != scanner.handlers().end(); ++h) {
bool good = false;
if (lg_parse_pattern(ParsedPattern, (*h)->RE.c_str(), &(*h)->Options, &lgErr)) {
for (vector<string>::const_iterator enc((*h)->Encodings.begin()); enc != (*h)->Encodings.end(); ++enc) {
idx = lg_add_pattern(Fsm, PatternInfo, ParsedPattern, enc->c_str(), &lgErr);
if (idx >= 0) {
lg_pattern_info(PatternInfo, idx)->UserData = const_cast<void*>(static_cast<const void*>(&((*h)->Callback)));
patBegin = std::min(patBegin, static_cast<unsigned int>(idx));
good = true;
}
}
}
if (!good) {
if (scanner.handleParseError(**h, lgErr)) {
lg_free_error(lgErr);
lgErr = 0;
}
else {
return false;
}
}
}
patEnd = lg_pattern_map_size(PatternInfo);
scanner.patternRange() = make_pair(patBegin, patEnd);
Scanners.push_back(&scanner);
return true;
}
bool LightgrepController::addUserPatterns(PatternScanner& scanner, CallbackFnType* callbackPtr, const FindOptsStruct& user) {
unsigned int patBegin = lg_pattern_map_size(PatternInfo),
patEnd = 0;
LG_KeyOptions opts;
opts.FixedString = 0;
opts.CaseInsensitive = 0;
LG_Error *err = 0;
for (vector<string>::const_iterator itr(user.Files.begin()); itr != user.Files.end(); ++itr) {
ifstream file(itr->c_str(), ios::in);
if (!file.is_open()) {
cerr << "Could not open pattern file '" << *itr << "'." << endl;
return false;
}
string contents = string(istreambuf_iterator<char>(file), istreambuf_iterator<char>());
const char* contentsCStr = contents.c_str();
if (lg_add_pattern_list(Fsm, PatternInfo, contentsCStr, DefaultEncodingsCStrings, 2, &opts, &err) < 0) {
vector<string> lines;
istringstream input(contents);
string line;
while (input) {
getline(input, line);
lines.push_back(line);
}
LG_Error* cur(err);
while (cur) {
cerr << "Error in " << *itr << ", line " << cur->Index+1 << ", pattern '" << lines[cur->Index]
<< "': " << cur->Message << endl;
cur = cur->Next;
}
lg_free_error(err);
return false;
}
}
for (vector<string>::const_iterator itr(user.Patterns.begin()); itr != user.Patterns.end(); ++itr) {
bool good = false;
if (lg_parse_pattern(ParsedPattern, itr->c_str(), &opts, &err)) {
for (unsigned int i = 0; i < NumDefaultEncodings; ++i) {
if (lg_add_pattern(Fsm, PatternInfo, ParsedPattern, DefaultEncodingsCStrings[i], &err) >= 0) {
good = true;
}
}
}
if (!good) {
cerr << "Error on '" << *itr << "': " << err->Message << endl;
lg_free_error(err);
return false;
}
}
patEnd = lg_pattern_map_size(PatternInfo);
for (unsigned int i = patBegin; i < patEnd; ++i) {
lg_pattern_info(PatternInfo, i)->UserData = const_cast<void*>(static_cast<const void*>(callbackPtr));
}
scanner.patternRange() = make_pair(patBegin, patEnd);
Scanners.push_back(&scanner);
return true;
}
void LightgrepController::processHit(const vector<PatternScanner*>& sTbl, const LG_SearchHit& hit, const scanner_params& sp, const recursion_control_block& rcb) {
// lookup the handler's callback functor, then invoke it
CallbackFnType* cbPtr(static_cast<CallbackFnType*>(lg_pattern_info(PatternInfo, hit.KeywordIndex)->UserData));
((*sTbl[hit.KeywordIndex]).*(*cbPtr))(hit, sp, rcb); // ...yep...
}
void STest::init(const std::vector<Pattern>& pats) {
std::unique_ptr<PatternHandle,void(*)(PatternHandle*)> pat(
lg_create_pattern(),
lg_destroy_pattern
);
PMap = std::unique_ptr<PatternMapHandle,void(*)(PatternMapHandle*)>(
lg_create_pattern_map(pats.size()),
lg_destroy_pattern_map
);
std::unique_ptr<FSMHandle,void(*)(FSMHandle*)> fsm(
lg_create_fsm(0),
lg_destroy_fsm
);
LG_KeyOptions keyOpts;
size_t i = 0, numErrors = 0;
for (const Pattern& p : pats) {
LG_Error* err = nullptr;
keyOpts.CaseInsensitive = p.CaseInsensitive;
keyOpts.FixedString = p.FixedString;
lg_parse_pattern(pat.get(), p.Expression.c_str(), &keyOpts, &err);
if (!err) {
lg_add_pattern(
fsm.get(), PMap.get(), pat.get(), p.Encoding.c_str(), &err
);
if (!err) {
// pack the user pattern number into the void*, oh the horror
LG_PatternInfo* pinfo = lg_pattern_info(PMap.get(), i - numErrors);
pinfo->UserData = reinterpret_cast<void*>(i);
}
}
if (err) {
lg_free_error(err);
++numErrors;
}
++i;
}
LG_ProgramOptions progOpts{1};
Prog = std::unique_ptr<ProgramHandle,void(*)(ProgramHandle*)>(
lg_create_program(fsm.get(), &progOpts),
lg_destroy_program
);
if (Prog) {
LG_ContextOptions ctxOpts;
Ctx = std::unique_ptr<ContextHandle,void(*)(ContextHandle*)>(
lg_create_context(Prog.get(), &ctxOpts),
lg_destroy_context
);
}
}
