Minor improvements in DRN parser

src/storm/parser/DirectEncodingParser.cpp

@@ -40,26 +40,27 @@ namespace storm {
             bool sawParameters = false;
             size_t nrStates = 0;
             storm::models::ModelType type;
-
             std::vector<std::string> rewardModelNames;
-
             std::shared_ptr<storm::storage::sparse::ModelComponents<ValueType, RewardModelType>> modelComponents;
 
             // Parse header
-            while(std::getline(file, line)) {
-                if(line.empty() || boost::starts_with(line, "//")) {
+            while (std::getline(file, line)) {
+                if (line.empty() || boost::starts_with(line, "//")) {
                     continue;
                 }
 
                 if (boost::starts_with(line, "@type: ")) {
+                    // Parse type
                     STORM_LOG_THROW(!sawType, storm::exceptions::WrongFormatException, "Type declared twice");
                     type = storm::models::getModelType(line.substr(7));
                     STORM_LOG_TRACE("Model type: " << type);
                     STORM_LOG_THROW(type != storm::models::ModelType::MarkovAutomaton, storm::exceptions::NotSupportedException, "Markov Automata in DRN format are not supported (unclear indication of Markovian Choices in DRN format)");
                     STORM_LOG_THROW(type != storm::models::ModelType::S2pg, storm::exceptions::NotSupportedException, "Stochastic Two Player Games in DRN format are not supported.");
                     sawType = true;
-                }
-                if(line == "@parameters") {
+
+                } else if (line == "@parameters") {
+                    // Parse parameters
+                    STORM_LOG_THROW(!sawParameters, storm::exceptions::WrongFormatException, "Parameters declared twice");
                     std::getline(file, line);
                     if (line != "") {
                         std::vector<std::string> parameters;
@@ -70,26 +71,28 @@ namespace storm {
                         }
                     }
                     sawParameters = true;
-                }
-                if(line == "@reward_models") {
+
+                } else if (line == "@reward_models") {
+                    // Parse reward models
                     STORM_LOG_THROW(rewardModelNames.size() == 0, storm::exceptions::WrongFormatException, "Reward model names declared twice");
                     std::getline(file, line);
                     boost::split(rewardModelNames, line, boost::is_any_of("\t "));
-                }
-                if(line == "@nr_states") {
+                } else if (line == "@nr_states") {
+                    // Parse no. of states
                     STORM_LOG_THROW(nrStates == 0, storm::exceptions::WrongFormatException, "Number states declared twice");
                     std::getline(file, line);
                     nrStates = NumberParser<size_t>::parse(line);
-
-                }
-                if(line == "@model") {
+                } else if (line == "@model") {
+                    // Parse rest of the model
                     STORM_LOG_THROW(sawType, storm::exceptions::WrongFormatException, "Type has to be declared before model.");
                     STORM_LOG_THROW(sawParameters, storm::exceptions::WrongFormatException, "Parameters have to be declared before model.");
-                    STORM_LOG_THROW(nrStates != 0, storm::exceptions::WrongFormatException, "Nr States has to be declared before model.");
+                    STORM_LOG_THROW(nrStates != 0, storm::exceptions::WrongFormatException, "No. of states has to be declared before model.");
 
                     // Construct model components
                     modelComponents = parseStates(file, type, nrStates, valueParser, rewardModelNames);
                     break;
+                } else {
+                    STORM_LOG_THROW(false, storm::exceptions::WrongFormatException, "Could not parse line '" << line << "'.");
                 }
             }
             // Done parsing
@@ -182,8 +185,8 @@ namespace storm {
                     } else {
                         ++row;
                     }
-                    line = line.substr(8);
                     STORM_LOG_TRACE("New action: " << row);
+                    line = line.substr(8); //Remove "\taction "
                     // Check for rewards
                     if (boost::starts_with(line, "[")) {
                         // Rewards found

src/storm/utility/DirectEncodingExporter.cpp

@@ -56,6 +56,7 @@ namespace storm {
 
             storm::storage::SparseMatrix<ValueType> const& matrix = sparseModel->getTransitionMatrix();
 
+            // Iterate over states and export state information and outgoing transitions
             for (typename storm::storage::SparseMatrix<ValueType>::index_type group = 0; group < matrix.getRowGroupCount(); ++group) {
                 os << "state " << group;
 
@@ -92,22 +93,23 @@ namespace storm {
 
                 // Iterate over all actions
                 for (typename storm::storage::SparseMatrix<ValueType>::index_type row = start; row < end; ++row) {
-                    // Print the actual row.
+                    // Write choice
                     if (sparseModel->hasChoiceLabeling()) {
                         os << "\taction ";
                         bool lfirst = true;
                         for (auto const& label : sparseModel->getChoiceLabeling().getLabelsOfChoice(row)) {
                             if (!lfirst) {
                                 os << "_";
+                                lfirst = false;
                             }
                             os << label;
-                            lfirst = false;
                         }
                     } else {
                         os << "\taction " << row - start;
                     }
+
+                    // Write action rewards
                     bool first = true;
-                    // Write transition rewards
                     for (auto const& rewardModelEntry : sparseModel->getRewardModels()) {
                         if (first) {
                             os << " [";
@@ -116,7 +118,7 @@ namespace storm {
                             os << ", ";
                         }
 
-                        if(rewardModelEntry.second.hasStateActionRewards()) {
+                        if (rewardModelEntry.second.hasStateActionRewards()) {
                             os << storm::utility::to_string(rewardModelEntry.second.getStateActionRewardVector().at(row));
                         } else {
                             os << "0";
@@ -126,18 +128,17 @@ namespace storm {
                     if (!first) {
                         os << "]";
                     }
-
                     os << std::endl;
 
-                    // Write probabilities
-                    for(auto it = matrix.begin(row); it != matrix.end(row); ++it) {
+                    // Write transitions
+                    for (auto it = matrix.begin(row); it != matrix.end(row); ++it) {
                         ValueType prob = it->getValue();
                         os << "\t\t" << it->getColumn() << " : ";
                         os << storm::utility::to_string(prob) << std::endl;
                     }
 
                 }
-            } // end matrix iteration
+            } // end state iteration
 
         }
 
@@ -146,9 +147,6 @@ namespace storm {
             return {};
         }
 
-        template void explicitExportSparseModel<double>(std::ostream& os, std::shared_ptr<storm::models::sparse::Model<double>> sparseModel, std::vector<std::string> const& parameters);
-
-#ifdef STORM_HAVE_CARL
         template<>
         std::vector<std::string> getParameters(std::shared_ptr<storm::models::sparse::Model<storm::RationalFunction>> sparseModel) {
             std::vector<std::string> parameters;
@@ -167,8 +165,9 @@ namespace storm {
             return parameters;
         }
 
+        // Template instantiations
+        template void explicitExportSparseModel<double>(std::ostream& os, std::shared_ptr<storm::models::sparse::Model<double>> sparseModel, std::vector<std::string> const& parameters);
         template void explicitExportSparseModel<storm::RationalNumber>(std::ostream& os, std::shared_ptr<storm::models::sparse::Model<storm::RationalNumber>> sparseModel, std::vector<std::string> const& parameters);
         template void explicitExportSparseModel<storm::RationalFunction>(std::ostream& os, std::shared_ptr<storm::models::sparse::Model<storm::RationalFunction>> sparseModel, std::vector<std::string> const& parameters);
-#endif
     }
 }

src/storm/utility/DirectEncodingExporter.h

@@ -18,7 +18,7 @@ namespace storm {
         void explicitExportSparseModel(std::ostream& os, std::shared_ptr<storm::models::sparse::Model<ValueType>> sparseModel, std::vector<std::string> const& parameters);
 
         /*!
-         * Accumalate parameters in the model.
+         * Accumulate parameters in the model.
          *
          * @param sparseModel Model.
          * @return List of parameters in the model.