fix: prevent Nan::Utf8String destructor call due to out of scope, fixes

tree-sitter#72

src/query.cc

@@ -95,6 +95,7 @@ void Query::New(const Nan::FunctionCallbackInfo<Value> &info) {
  uint32_t source_len;
  uint32_t error_offset = 0;
  TSQueryError error_type = TSQueryErrorNone;
+ TSQuery *query;
 
  if (language == nullptr) {
  Nan::ThrowError("Missing language argument");
@@ -103,21 +104,21 @@ void Query::New(const Nan::FunctionCallbackInfo<Value> &info) {
 
  if (info[1]->IsString()) {
  auto string = Nan::To<String> (info[1]).ToLocalChecked();
- source = *Nan::Utf8String(string);
- source_len = string->Length();
+ Nan::Utf8String utf8_string(string);
+ source = *utf8_string;
+ source_len = utf8_string.length();
+ query = ts_query_new(language, source, source_len, &error_offset, &error_type);
  }
  else if (node::Buffer::HasInstance(info[1])) {
  source = node::Buffer::Data(info[1]);
  source_len = node::Buffer::Length(info[1]);
+ query = ts_query_new(language, source, source_len, &error_offset, &error_type);
  }
  else {
  Nan::ThrowError("Missing source argument");
  return;
  }
 
- TSQuery *query = ts_query_new(
- language, source, source_len, &error_offset, &error_type);
-
  if (error_offset > 0) {
  const char *error_name = query_error_names[error_type];
  std::string message = "Query error of type ";