hopefully parsing?

lights.js

@@ -9,6 +9,7 @@ const fade_ticks = cfg.fade_ticks || 20;
 var pixels = new Uint32Array(cfg.leds);
 var pixel_cache = new Uint32Array(cfg.leds);
 var next_pattern = new Uint32Array(cfg.leds);
+const targets = {}
 var pattern = {}
 
 function rgb_to_int(r, g, b) {
@@ -32,11 +33,14 @@ ws281x.configure({
 });
 
 export function set_pattern(pat) {
-  pattern = pat
+  log.debug("pattern set");
+  pattern = pat;
 }
 
 let functions = {
-  rand: () => { return Math.floor(Math.random() * 256) }
+  random: (index, args, prev) => { return Math.floor(Math.random() * 256) },
+  constant: (index, args, prev) => { return args; },
+  modulo: (index, args, prev) => { return prev % args; }
 }
 
 function tick_pattern() {
@@ -44,7 +48,23 @@ function tick_pattern() {
   log.debug("TICKING PATTERN")
 
   if (Object.keys(pattern).length > 0) {
-
+    for (let i = 0; i < cfg.leds; i++) {
+      for (let command of pattern) {
+        if (command.valid) {
+          let instruction = command.instruction;
+          if (functions[instruction.name.toLowerCase()]) {
+            for (let target of instruction.args) {
+              let channel = target.channel;
+              if (!targets[channel]) {
+                targets[channel] = 0;
+              }
+              targets[channel] =
+                functions[instruction.name.toLowerCase()](i, target.arg, targets[channel]);
+            }
+          }
+        }
+      }
+    }
   }
   else {
     getRandom()