Now can load action specs from JSON.

Makefile

@@ -41,7 +41,7 @@ clean:
 	meson compile --clean -C builddir
 
 debug_test: build
-	gdb --nx -x .gdbinit --ex run --args builddir/runtests.exe -e
+	gdb --nx -x .gdbinit --ex run --args builddir/runtests.exe -e "[goap]"
 
 win_installer:
 	powershell 'start "C:\Program Files (x86)\solicus\InstallForge\bin\ifbuilderenvx86.exe" win_installer.ifp'

goap.cpp

@@ -2,18 +2,66 @@
 #include "goap.hpp"
 
 namespace ailol {
+  using namespace nlohmann;
+
   bool is_subset(GOAPState& source, GOAPState& target) {
     GOAPState result = source & target;
     return result == target;
   }
 
+  void Action::needs(int name, bool val) {
+    if(val) {
+      $positive_preconds[name] = true;
+      $negative_preconds[name] = false;
+    } else {
+      $negative_preconds[name] = true;
+      $positive_preconds[name] = false;
+    }
+  }
+
+  void Action::effect(int name, bool val) {
+    if(val) {
+      $positive_effects[name] = true;
+      $negative_effects[name] = false;
+    } else {
+      $negative_effects[name] = true;
+      $positive_effects[name] = false;
+    }
+  }
+
+  void Action::load(nlohmann::json& profile, nlohmann::json& config) {
+    dbc::check(config.contains("needs"),
+        fmt::format("Action.load({}): no 'needs' field", $name));
+    dbc::check(config.contains("effects"),
+        fmt::format("Action.load({}): no 'effects' field", $name));
+
+    for(auto& [name_key, value] : profile.items()) {
+      dbc::check(value < STATE_MAX, fmt::format("Action.load({}): profile field {} has value {} greater than STATE_MAX {}", $name, (std::string)name_key, (int)value, STATE_MAX));
+    }
+
+    for(auto& [name_key, value] : config["needs"].items()) {
+      dbc::check(profile.contains(name_key), fmt::format("Action.load({}): profile does not have name {}", $name, name_key));
+      int name = profile[name_key].template get<int>();
+
+      needs(name, bool(value));
+    }
+
+    for(auto& [name_key, value] : config["effects"].items()) {
+      dbc::check(profile.contains(name_key), fmt::format("Action.load({}): profile does not have name {}", $name, name_key));
+
+      int name = profile[name_key].template get<int>();
+
+      effect(name, bool(value));
+    }
+  }
+
   bool Action::can_effect(GOAPState& state) {
-    return ((state & positive_preconds) == positive_preconds) &&
-      ((state & negative_preconds) == ALL_ZERO);
+    return ((state & $positive_preconds) == $positive_preconds) &&
+      ((state & $negative_preconds) == ALL_ZERO);
   }
 
   GOAPState Action::apply_effect(GOAPState& state) {
-    return (state | positive_effects) & ~negative_effects;
+    return (state | $positive_effects) & ~$negative_effects;
   }
 
   int distance_to_goal(GOAPState& from, GOAPState& to) {

goap.hpp

@@ -4,10 +4,11 @@
 #include <bitset>
 #include <limits>
 #include <optional>
+#include <nlohmann/json.hpp>
 
 namespace ailol {
   constexpr const int SCORE_MAX = std::numeric_limits<int>::max();
-  constexpr const size_t STATE_MAX = 93;
+  constexpr const size_t STATE_MAX = 32;
 
   using GOAPState = std::bitset<STATE_MAX>;
 
@@ -15,39 +16,27 @@ namespace ailol {
   const GOAPState ALL_ONES = ~ALL_ZERO;
 
   struct Action {
-    std::string name;
-    int cost = 0;
+    std::string $name;
+    int $cost = 0;
 
-    GOAPState positive_preconds;
-    GOAPState negative_preconds;
+    GOAPState $positive_preconds;
+    GOAPState $negative_preconds;
 
-    GOAPState positive_effects;
-    GOAPState negative_effects;
+    GOAPState $positive_effects;
+    GOAPState $negative_effects;
 
     Action(std::string name, int cost) :
-      name(name), cost(cost) { }
+      $name(name), $cost(cost) { }
 
-    void set_precond(int name, bool val) {
-      if(val) {
-        positive_preconds[name] = true;
-      } else {
-        negative_preconds[name] = true;
-      }
-    }
-
-    void set_effect(int name, bool val) {
-      if(val) {
-        positive_effects[name] = true;
-      } else {
-        negative_effects[name] = true;
-      }
-    }
+    void needs(int name, bool val);
+    void effect(int name, bool val);
+    void load(nlohmann::json &profile, nlohmann::json& config);
 
     bool can_effect(GOAPState& state);
     GOAPState apply_effect(GOAPState& state);
 
     bool operator==(const Action& other) const {
-      return other.name == name;
+      return other.$name == $name;
     }
   };
 
@@ -76,7 +65,7 @@ namespace ailol {
 
 template<> struct std::hash<ailol::Action> {
   size_t operator()(const ailol::Action& p) const {
-    return std::hash<std::string>{}(p.name);
+    return std::hash<std::string>{}(p.$name);
   }
 };
 

tests/goap.cpp

@@ -5,6 +5,7 @@
 
 using namespace dbc;
 using namespace ailol;
+using namespace nlohmann;
 
 TEST_CASE("worldstate works", "[goap]") {
   enum StateNames {
@@ -24,8 +25,8 @@ TEST_CASE("worldstate works", "[goap]") {
   goal[ENEMY_DEAD] = true;
 
   Action move_closer("move_closer", 10);
-  move_closer.set_precond(ENEMY_IN_RANGE, false);
-  move_closer.set_effect(ENEMY_IN_RANGE, true);
+  move_closer.needs(ENEMY_IN_RANGE, false);
+  move_closer.effect(ENEMY_IN_RANGE, true);
 
   REQUIRE(move_closer.can_effect(start));
   auto after_move_state = move_closer.apply_effect(start);
@@ -38,9 +39,9 @@ TEST_CASE("worldstate works", "[goap]") {
   REQUIRE(distance_to_goal(start, after_move_state) == 1);
 
   Action kill_it("kill_it", 10);
-  kill_it.set_precond(ENEMY_IN_RANGE, true);
-  kill_it.set_precond(ENEMY_DEAD, false);
-  kill_it.set_effect(ENEMY_DEAD, true);
+  kill_it.needs(ENEMY_IN_RANGE, true);
+  kill_it.needs(ENEMY_DEAD, false);
+  kill_it.effect(ENEMY_DEAD, true);
 
   REQUIRE(!kill_it.can_effect(start));
   REQUIRE(kill_it.can_effect(after_move_state));
@@ -73,13 +74,19 @@ TEST_CASE("basic feature tests", "[goap]") {
   goal[ENEMY_DEAD] = true;
 
   Action move_closer("move_closer", 10);
-  move_closer.set_precond(ENEMY_IN_RANGE, false);
-  move_closer.set_effect(ENEMY_IN_RANGE, true);
+  move_closer.needs(ENEMY_IN_RANGE, false);
+  move_closer.effect(ENEMY_IN_RANGE, true);
 
   Action kill_it("kill_it", 10);
-  kill_it.set_precond(ENEMY_IN_RANGE, true);
-  kill_it.set_precond(ENEMY_DEAD, false);
-  kill_it.set_effect(ENEMY_DEAD, true);
+  kill_it.needs(ENEMY_IN_RANGE, true);
+  // this is duplicated on purpose to confirm that setting
+  // a positive then a negative properly cancels out
+  kill_it.needs(ENEMY_DEAD, true);
+  kill_it.needs(ENEMY_DEAD, false);
+
+  // same thing with effects
+  kill_it.effect(ENEMY_DEAD, false);
+  kill_it.effect(ENEMY_DEAD, true);
 
   // order seems to matter which is wrong
   actions.push_back(kill_it);
@@ -91,7 +98,6 @@ TEST_CASE("basic feature tests", "[goap]") {
   auto state = start;
 
   for(auto& action : *result) {
-    fmt::println("ACTION: {}", action.name);
     state = action.apply_effect(state);
   }
 
@@ -100,53 +106,79 @@ TEST_CASE("basic feature tests", "[goap]") {
 
 TEST_CASE("wargame test from cppGOAP", "[goap]") {
   std::vector<Action> actions;
-
-  // Constants for the various states are helpful to keep us from
-  // accidentally mistyping a state name.
-  enum WarGameStates {
-    target_acquired,
-    target_lost,
-    target_in_warhead_range,
-    target_dead
-  };
+  auto profile = R"({
+    "target_acquired": 0,
+    "target_lost": 1,
+    "target_in_warhead_range": 2,
+    "target_dead": 3
+  })"_json;
 
   // Now establish all the possible actions for the action pool
   // In this example we're providing the AI some different FPS actions
   Action spiral("searchSpiral", 5);
-  spiral.set_precond(target_acquired, false);
-  spiral.set_precond(target_lost, true);
-  spiral.set_effect(target_acquired, true);
+  auto config = R"({
+    "needs": {
+      "target_acquired": false,
+      "target_lost": true
+    },
+    "effects": {
+      "target_acquired": true
+    }
+  })"_json;
+  spiral.load(profile, config);
   actions.push_back(spiral);
 
   Action serpentine("searchSerpentine", 5);
-  serpentine.set_precond(target_acquired, false);
-  serpentine.set_precond(target_lost, false);
-  serpentine.set_effect(target_acquired, true);
+  config = R"({
+    "needs": {
+      "target_acquired": false,
+      "target_lost": false
+    },
+    "effects": {
+      "target_acquired": true
+    }
+  })"_json;
+  serpentine.load(profile, config);
   actions.push_back(serpentine);
 
   Action intercept("interceptTarget", 5);
-  intercept.set_precond(target_acquired, true);
-  intercept.set_precond(target_dead, false);
-  intercept.set_effect(target_in_warhead_range, true);
+  config = R"({
+    "needs": {
+      "target_acquired": true,
+      "target_dead": false
+    },
+    "effects": {
+      "target_in_warhead_range": true
+    }
+  })"_json;
+  intercept.load(profile, config);
   actions.push_back(intercept);
 
+
   Action detonateNearTarget("detonateNearTarget", 5);
-  detonateNearTarget.set_precond(target_in_warhead_range, true);
-  detonateNearTarget.set_precond(target_acquired, true);
-  detonateNearTarget.set_precond(target_dead, false);
-  detonateNearTarget.set_effect(target_dead, true);
+  config = R"({
+    "needs": {
+      "target_in_warhead_range": true,
+      "target_acquired": true,
+      "target_dead": false
+    },
+    "effects": {
+      "target_dead": true
+    }
+  })"_json;
+  detonateNearTarget.load(profile, config);
   actions.push_back(detonateNearTarget);
 
   // Here's the initial state...
   GOAPState initial_state;
-  initial_state[target_acquired] = false;
-  initial_state[target_lost] = true;
-  initial_state[target_in_warhead_range] = false;
-  initial_state[target_dead] = false;
+  initial_state[profile["target_acquired"]] = false;
+  initial_state[profile["target_lost"]] = true;
+  initial_state[profile["target_in_warhead_range"]] = false;
+  initial_state[profile["target_dead"]] = false;
 
   // ...and the goal state
   GOAPState goal_target_dead;
-  goal_target_dead[target_dead] = true;
+  goal_target_dead[profile["target_dead"]] = true;
 
   auto result = plan_actions(actions, initial_state, goal_target_dead);
   REQUIRE(result != std::nullopt);
@@ -154,9 +186,9 @@ TEST_CASE("wargame test from cppGOAP", "[goap]") {
   auto state = initial_state;
 
   for(auto& action : *result) {
-    fmt::println("ACTION: {}", action.name);
+    fmt::println("ACTION: {}", action.$name);
     state = action.apply_effect(state);
   }
 
-  REQUIRE(state[target_dead]);
+  REQUIRE(state[profile["target_dead"]]);
 }