script/script_managed

• C

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  #include <script_managed.h>
  #include <stdio.h>
   
  /* This example shows how to create a managed script. A managed script remains
   * in memory after it is ran, and makes it possible to inspect and modify the
   * script. Managed scripts can be inspected and modified from the explorer.
   * 
   * Updating a script will delete any entities or components that are no longer
   * described by the script.
   */
   
  void print_planets(ecs_world_t *world) {
      ecs_entity_t sun = ecs_lookup(world, "Sun");
      ecs_iter_t it = ecs_children(world, sun);
      while (ecs_children_next(&it)) {
          for (int i = 0; i < it.count; i ++) {
              printf(" - %s\n", ecs_get_name(world, it.entities[i]));
          }
      }
  }
   
  int main(int argc, char *argv[]) {
      ecs_world_t *world = ecs_init_w_args(argc, argv);
   
      ecs_entity_t script = ecs_script(world, {
          .code = 
              "Sun {\n"
              "  Mercury {}\n"
              "  Venus {}\n"
              "  Earth {}\n"
              "  Mars {}\n"
              "  Jupiter {}\n"
              "  Saturn {}\n"
              "  Neptune {}\n"
              "  Uranus {}\n"
              "  Pluto {}\n"
              "}\n"
      });
   
      if (!script) {
          printf("script failed to run\n");
      }
   
      printf("Before updating script:\n");
      print_planets(world);
   
      ecs_script_update(world, script, 0,
          "Sun {\n"
          "  Mercury {}\n"
          "  Venus {}\n"
          "  Earth {}\n"
          "  Mars {}\n"
          "  Jupiter {}\n"
          "  Saturn {}\n"
          "  Neptune {}\n"
          "  Uranus {}\n"
          // Pluto {}\n" not a planet :(
          "}\n"
      );
   
      printf("\nAfter updating script:\n");
      print_planets(world);
   
      return ecs_fini(world);
   
      // Output
      //  Before updating script:
      //   - Mercury
      //   - Venus
      //   - Earth
      //   - Mars
      //   - Jupiter
      //   - Saturn
      //   - Neptune
      //   - Uranus
      //   - Pluto
      //  
      //  After updating script:
      //   - Mercury
      //   - Venus
      //   - Earth
      //   - Mars
      //   - Jupiter
      //   - Saturn
      //   - Neptune
      //   - Uranus
  }