better error handling in wcclrun

wcclrun/main.cpp

@@ -17,7 +17,7 @@
 #include <antlr/MismatchedTokenException.hpp>
 
 
-void load_more_operators(const std::string& filename, Wccl::Parser& parser,
+bool load_more_operators(const std::string& filename, Wccl::Parser& parser,
 	std::vector< boost::shared_ptr<Wccl::FunctionalOperator> >& ops)
 {
 
@@ -32,6 +32,7 @@ void load_more_operators(const std::string& filename, Wccl::Parser& parser,
 		retOp = parser.parseAnyOperator(is);
 		if (retOp) {
 			ops.push_back(retOp);
+			return true;
 		} else {
 			std::cerr << "Problem while parsing -- "
 				<< "parser returned NULL!" << std::endl;
@@ -53,6 +54,7 @@ void load_more_operators(const std::string& filename, Wccl::Parser& parser,
 	} catch (antlr::ANTLRException& e) {
 		std::cerr << "Antlr error " << e.getMessage() << std::endl;
 	}
+	return false;
 }
 
 class streamsave
@@ -187,7 +189,13 @@ int main(int argc, char** argv)
 		std::vector< boost::shared_ptr<Wccl::FunctionalOperator> > operators;
 		Wccl::Parser parser(tagset);
 		foreach (const std::string& f, ccl_files) {
-			load_more_operators(f, parser, operators);
+			int sz = operators.size();
+			if (!load_more_operators(f, parser, operators)) {
+				std::cerr << "Warning: error while parsing " << f << "\n";
+			}
+			if (operators.size() == sz) {
+				std::cerr << "Warning: no operators loaded from " << f << "\n";
+			}
 		}
 		if (!operators.empty()) {
 			foreach (const std::string& f, corpora_files) {