Added from_to sequence diagram generator for json

src/sequence_diagram/generators/json/sequence_diagram_generator.cc

@@ -609,6 +609,52 @@ void generator::generate_diagram(nlohmann::json &parent) const
         }
     }
 
+    for (const auto &ft : config().from_to()) {
+        // First, find the sequence of activities from 'from' location
+        // to 'to' location
+        assert(ft.size() == 2);
+
+        const auto &from_location = ft.front();
+        const auto &to_location = ft.back();
+
+        auto [from_activity_id, to_activity_id] =
+            model().get_from_to_activity_ids(from_location, to_location);
+
+        if (from_activity_id == 0 || to_activity_id == 0)
+            continue;
+
+        auto message_chains_unique = model().get_all_from_to_message_chains(
+            from_activity_id, to_activity_id);
+
+        nlohmann::json sequence;
+        sequence["from_to"]["from"]["location"] = from_location.location;
+        sequence["from_to"]["from"]["id"] = from_activity_id;
+        sequence["from_to"]["to"]["location"] = to_location.location;
+        sequence["from_to"]["to"]["id"] = to_activity_id;
+
+        block_statements_stack_.push_back(std::ref(sequence));
+
+        sequence["message_chains"] = nlohmann::json::array();
+
+        for (const auto &mc : message_chains_unique) {
+            nlohmann::json message_chain;
+
+            block_statements_stack_.push_back(std::ref(message_chain));
+
+            for (const auto &m : mc) {
+                generate_call(m, current_block_statement());
+            }
+
+            block_statements_stack_.pop_back();
+
+            sequence["message_chains"].push_back(std::move(message_chain));
+        }
+
+        block_statements_stack_.pop_back();
+
+        json_["sequences"].push_back(std::move(sequence));
+    }
+
     for (const auto &sf : config().start_from()) {
         if (sf.location_type == location_t::function) {
             common::model::diagram_element::id_t start_from{0};

src/sequence_diagram/generators/plantuml/sequence_diagram_generator.cc

@@ -416,8 +416,14 @@ void generator::generate_diagram(std::ostream &ostr) const
         const auto &from_location = ft.front();
         const auto &to_location = ft.back();
 
-        auto message_chains_unique =
-            model().get_all_from_to_message_chains(from_location, to_location);
+        auto [from_activity_id, to_activity_id] =
+            model().get_from_to_activity_ids(from_location, to_location);
+
+        if (from_activity_id == 0 || to_activity_id == 0)
+            continue;
+
+        auto message_chains_unique = model().get_all_from_to_message_chains(
+            from_activity_id, to_activity_id);
 
         bool first_separator_skipped{false};
         for (const auto &mc : message_chains_unique) {

src/sequence_diagram/model/diagram.cc

@@ -209,14 +209,11 @@ std::vector<std::string> diagram::list_start_from_values() const
     return result;
 }
 
-std::unordered_set<message_chain_t> diagram::get_all_from_to_message_chains(
-    const config::source_location &from_location,
+std::pair<common::model::diagram_element::id_t,
+    common::model::diagram_element::id_t>
+diagram::get_from_to_activity_ids(const config::source_location &from_location,
     const config::source_location &to_location) const
 {
-    std::unordered_set<message_chain_t> message_chains_unique{};
-
-    if ((from_location.location_type == config::location_t::function) &&
-        (to_location.location_type == config::location_t::function)) {
     common::model::diagram_element::id_t from_activity{0};
     common::model::diagram_element::id_t to_activity{0};
 
@@ -224,8 +221,7 @@ std::unordered_set<message_chain_t> diagram::get_all_from_to_message_chains(
         const auto &caller = *participants().at(v.from());
         std::string vfrom = caller.full_name(false);
         if (vfrom == from_location.location) {
-                LOG_DBG(
-                    "Found sequence diagram start point '{}': {}", vfrom, k);
+            LOG_DBG("Found sequence diagram start point '{}': {}", vfrom, k);
             from_activity = k;
             break;
         }
@@ -235,7 +231,7 @@ std::unordered_set<message_chain_t> diagram::get_all_from_to_message_chains(
         LOG_WARN("Failed to find 'from' participant {} for start_from "
                  "condition",
             from_location.location);
-            return {};
+        return {from_activity, to_activity};
     }
 
     for (const auto &[k, v] : sequences()) {
@@ -245,8 +241,8 @@ std::unordered_set<message_chain_t> diagram::get_all_from_to_message_chains(
             const auto &callee = *participants().at(m.to());
             std::string vto = callee.full_name(false);
             if (vto == to_location.location) {
-                    LOG_DBG("Found sequence diagram end point '{}': {}", vto,
-                        m.to());
+                LOG_DBG(
+                    "Found sequence diagram end point '{}': {}", vto, m.to());
                 to_activity = m.to();
                 break;
             }
@@ -257,9 +253,18 @@ std::unordered_set<message_chain_t> diagram::get_all_from_to_message_chains(
         LOG_WARN("Failed to find 'to' participant {} for from_to "
                  "condition",
             to_location.location);
-            return {};
+        return {from_activity, to_activity};
     }
 
+    return {from_activity, to_activity};
+}
+
+std::unordered_set<message_chain_t> diagram::get_all_from_to_message_chains(
+    const common::model::diagram_element::id_t from_activity,
+    const common::model::diagram_element::id_t to_activity) const
+{
+    std::unordered_set<message_chain_t> message_chains_unique{};
+
     // Message (call) chains matching the specified from_to condition
     std::vector<message_chain_t> message_chains;
 
@@ -359,7 +364,6 @@ std::unordered_set<message_chain_t> diagram::get_all_from_to_message_chains(
         [from_activity](const message_chain_t &mc) {
             return !mc.empty() && (mc.front().from() == from_activity);
         });
-    }
 
     return message_chains_unique;
 }

src/sequence_diagram/model/diagram.h

@@ -241,11 +241,25 @@ public:
     /**
      * @brief Generate a list of message chains matching a from_to constraint
      *
+     * @param from_activity Source activity for from_to message chain
+     * @param to_activity Target activity for from_to message chain
      * @return List of message chains
      */
     std::unordered_set<message_chain_t> get_all_from_to_message_chains(
-        const config::source_location &from,
-        const config::source_location &to) const;
+        const common::model::diagram_element::id_t from_activity,
+        const common::model::diagram_element::id_t to_activity) const;
+
+    /**
+     * @brief Get ids of from and to activities in from_to constraint
+     *
+     * @param from_activity Source activity for from_to message chain
+     * @param to_activity Target activity for from_to message chain
+     * @return Pair of activity ids (0 if not found)
+     */
+    std::pair<common::model::diagram_element::id_t,
+        common::model::diagram_element::id_t>
+    get_from_to_activity_ids(const config::source_location &from_activity,
+        const config::source_location &to_activity) const;
 
     /**
      * @brief Once the diagram is complete, run any final processing.

tests/t20034/test_case.h

@@ -51,12 +51,11 @@ TEST_CASE("t20034", "[test-case][sequence]")
             config.output_directory() + "/" + diagram->name + ".puml", puml);
     }
 
-    //    {
-    //        auto j = generate_sequence_json(diagram, *model);
-    //
-    //        using namespace json;
-    //
-    //        save_json(config.output_directory() + "/" + diagram->name +
-    //        ".json", j);
-    //    }
+    {
+        auto j = generate_sequence_json(diagram, *model);
+
+        using namespace json;
+
+        save_json(config.output_directory() + "/" + diagram->name + ".json", j);
+    }
 }