chore(search): improve parser error reporting (#3184)

Signed-off-by: Roman Gershman <[email protected]>

src/core/search/parser.y

@@ -174,5 +174,5 @@ tag_list:
 void
 dfly::search::Parser::error(const location_type& l, const string& m)
 {
-  cerr << l << ": " << m << '\n';
+  driver->Error(l, m);
 }

src/core/search/query_driver.cc

@@ -18,6 +18,10 @@ void QueryDriver::ResetScanner() {
   scanner_->SetParams(params_);
 }
 
+void QueryDriver::Error(const Parser::location_type& loc, std::string_view msg) {
+  LOG(ERROR) << "Parse error " << loc << ": " << msg;
+}
+
 }  // namespace search
 
 }  // namespace dfly

src/core/search/query_driver.h

@@ -52,6 +52,8 @@ class QueryDriver {
     return scanner_.get();
   }
 
+  void Error(const Parser::location_type& loc, std::string_view msg);
+
  public:
   Parser::location_type location;