compare_projects: Initial stab at making a project comparison

python/libscratchproject/utils.py

@@ -1,4 +1,5 @@
-
+def __tupleit(l):
+    return tuple(map(__tupleit, l)) if isinstance(l, (list, tuple)) else l
 
 def _real_extract_blocks_from_stack(stack):
     for block in stack:
@@ -21,3 +22,35 @@ def extract_blocks_from_script(script):
     blocknames = []
     blocks = list(_real_extract_blocks_from_stack(script[2]))
     return blocks
+
+def compare_projects(project1, project2):
+    '''
+    Compares two project objects (or they can be revisions).
+    Comparison is done between scripts and assets.
+
+    Returns: List of changes to sprites and assets.
+    '''
+
+    blocks = [[],[]]
+    assets = [[],[]]
+
+    i = 0
+    for p in [project1, project2]:
+        for sprite in p.sprites:
+            try:
+                for script in sprite.scripts:
+                    blocks[i].extend(extract_blocks_from_script(script))
+            except AttributeError:
+                pass
+            sounds = [x.md5 for x in sprite.sounds]
+            images = [x.baseLayerMD5 for x in sprite.costumes]
+            assets[i] = sounds + images
+        i += 1
+
+    block_diff = set(__tupleit(blocks[0])) ^ set(__tupleit(blocks[1]))
+    asset_diff = set(assets[0]) ^ set(assets[1])
+
+    return {'block_diff' : block_diff, 'asset_diff' : asset_diff}
+
+
+