meta: add sources from prototype meadow build system

prototype/cache.py

@@ -0,0 +1,69 @@
+import json
+import os
+
+
+cache_path = 'build/meadow-cache.json'
+cache_data = None
+
+
+class Cache:
+    def load():
+        global cache_data
+
+        if not os.path.exists(cache_path):
+            cache_data = {}
+            return
+
+        with open(cache_path, mode='r') as f:
+            cache_data = json.load(f)
+
+
+    def reset():
+        global cache_data
+        cache_data = {}
+
+
+    def save():
+        global cache_data
+
+        with open(cache_path, mode='w') as f:
+            json.dump(cache_data, f, indent=4)
+
+
+    def get(path):
+        parts = path.split('.')
+        container = cache_data
+
+        for p in parts[:-1]:
+            if p not in container:
+                return None
+
+            if not isinstance(container[p], dict):
+                print('Err: element "{}" in cache key "{}" is not a dictionary'.format(p, path))
+                return
+
+            container = container[p]
+
+
+        if parts[-1] in container:
+            return container[parts[-1]]
+
+        return None
+
+
+    def set(path, value):
+        parts = path.split('.')
+        container = cache_data
+
+        for p in parts[:-1]:
+            if p not in container:
+                container[p] = {}
+
+            if not isinstance(container[p], dict):
+                print('Err: element "{}" in cache key "{}" is not a dictionary'.format(p, path))
+                return
+
+            container = container[p]
+
+
+        container[parts[-1]] = value