2 files changed, 18 insertions, 4 deletions
diff --git a/src/simulation/lattice_rules.test.js b/src/simulation/lattice_rules.test.js
index 9a6a344..e541add 100644
--- a/src/simulation/lattice_rules.test.js
+++ b/src/simulation/lattice_rules.test.js
@@ -22,7 +22,7 @@ test("blinker", () => {
     [ D, D, D, D, D ],
   ];
 
-  const world = { lattice, lattice_rules, agents: [], senses: [], actions: [] };
+  const world = { lattice, lattice_rules, agents: [], senses: [], actions: [], validity: [] };
   expect(world_update(world).lattice).toEqual([
     [ D, D, D, D, D ],
     [ D, D, L, D, D ],
@@ -46,7 +46,7 @@ test("glider", () => {
     [ D, D, D, D, D, D ],
   ];
 
-  const world = { lattice, lattice_rules, agents: [], senses: [], actions: [] };
+  const world = { lattice, lattice_rules, agents: [], senses: [], actions: [], validity: [] };
   //expect(world_update(world).lattice).toEqual([
   expect(apply(world_update, 1, world).lattice).toEqual([
     [ D, D, D, D, D, D ],
@@ -94,7 +94,7 @@ test("beehive", () => {
     [ D, D, D, D, D, D ],
   ];
 
-  const world = { lattice, lattice_rules, agents: [], senses: [], actions: [] };
+  const world = { lattice, lattice_rules, agents: [], senses: [], actions: [], validity: [] };
   //expect(world_update(world).lattice).toEqual([
   expect(apply(world_update, 1, world).lattice).toEqual(lattice);
 });
diff --git a/src/world/world.js b/src/world/world.js
index e1d984d..e1ba0cf 100644
--- a/src/world/world.js
+++ b/src/world/world.js
@@ -3,6 +3,17 @@ import { agent_decide, agent_apply } from './agent.js';
 import { proposal_merge } from './proposal.js';
 
 
+// world structure:
+// {
+//   lattice
+//   lattice_rules: object
+//   agents: agent[]
+//   senses: sense[]
+//   actions: action[]
+//   validity: (function(proposal) => bool)[]
+// }
+
+
 export function world_update(world, postprocess=[]) {
   const lattice_props = lattice_update(world.lattice, world.lattice_rules);
   const intermediate_lattice = lattice_apply(world.lattice, lattice_props);
@@ -19,7 +30,10 @@ export function world_update(world, postprocess=[]) {
     .reduce((acc, prop) => proposal_merge(acc, prop), [])
     .filter(prop => lattice_valid(intermediate_lattice, prop))
 
-  const lattice = lattice_apply(intermediate_lattice, agent_props);
+  const lattice = lattice_apply(intermediate_lattice, world.validity.reduce(
+    (acc, rule) => acc.filter(rule),
+    agent_props
+  ));
   const agents = intermediate_agents.map(a => agent_apply(a, agent_props));
 
   const new_world = {...world, lattice, agents};