1 files changed, 41 insertions, 0 deletions
diff --git a/src/world/cell.js b/src/world/cell.js
new file mode 100644
index 0000000..5783d72
--- /dev/null
+++ b/src/world/cell.js
@@ -0,0 +1,41 @@
+'use strict';
+
+export function cells_update(cells, update_rules) {
+  return cells
+    .map((row, y) => row.map((cell, x) => [x, y, cell.type]))
+    .flat()
+    .reduce((acc, [x, y, type]) => [...acc, update_rules[type](cells, x, y)], [])
+    .filter(x => x !== undefined)
+}
+
+
+export function cells_valid(cells, proposal) {
+  if (!proposal.world_updates) { return true; }
+  return proposal.world_updates.reduce(
+    (acc, update) => {
+      const valid = 
+        (update.x >= 0 && update.x < cells[0].length) &&
+        (update.y >= 0 && update.y < cells.length) &&
+        (cells[update.y][update.x].type == update.from)
+        return valid && acc;
+    },
+    true
+  );
+}
+
+
+export function cells_apply(cells, proposals) {
+  return proposals.reduce(
+    (acc, prop) => {
+      const change = (prop.world_updates || []).reduce(
+        (acc_, update) => {
+          acc_[update.y][update.x].type = update.to;
+          return acc_
+        },
+        [...acc]
+      );
+      return change;
+    },
+    [...cells]
+  );
+}