Docserver manifest follow up (rewrite)

chrome/common/extensions/docs/server2/features_utility.py

+# Copyright 2013 The Chromium Authors. All rights reserved.

[not at google - send to devlin, 2013/07/29 23:30:09]

actually I think this should be called FeaturesModel (and the file needs to be
features_model.py).

[jshumway, 2013/07/30 23:15:50]

Done.

+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+class FeatureFile(object):

[not at google - send to devlin, 2013/07/29 23:30:09]

document what this is, what the keys are, etc.

[jshumway, 2013/07/30 23:15:50]

Done, though I have a little more to add here.

+  def __init__(self, features_json):

[not at google - send to devlin, 2013/07/29 23:30:09]

can we make this class immutable? it's much easier to reason about immutable
data and how it behaves when cached.

anything which needs to actually mutate state in some way can return a new
feature.

[jshumway, 2013/07/30 23:15:50]

Done.

+    self._features = {}
+    for name, value in features_json.iteritems():
+      if isinstance(value, list):
+        temp = None
+        for subvalue in value:
+          if not 'whitelist' in subvalue:
+            temp = subvalue
+            break
+        else:
+          continue
+        value = temp
+
+      if 'whitelist' in value:
+        continue
+      self._features[name] = { 'platform': [] }
+
+      platforms = value.pop('extension_types')
+      if platforms == 'all' or 'extension' in platforms:
+        self._features[name]['platform'].append('extension')
+      if platforms == 'all' or 'platform_app' in platforms:
+        self._features[name]['platform'].append('app')
+
+      self._features[name]['name'] = name
+      self._features[name].update(value)
+
+  def Filter(self, platform):

[not at google - send to devlin, 2013/07/29 23:30:09]

since we may want to filter based on other properties, perhaps platform should
be an optional argument.

[jshumway, 2013/07/30 23:15:50]

Done.

+    for name in self._features.keys():
+      feature = self._features[name]
+      if not platform in feature['platform']:
+        del self._features[name]
+
+    return self
+
+  def MergeWith(self, other):
+    '''Do a semi-recursive merge. Any keys common to both |self| and |other|
+    will have their dictionary values merged, instead of overwritten.
+    '''
+    for key, value in other.iteritems():
+      if key in self._features:
+        self._features[key].update(value)
+      else:
+        self._features[key] = value
+
+    return self
+
+  def InsertSubDocs(self):

[not at google - send to devlin, 2013/07/29 23:30:09]

perhaps the term children rather than subdocs would be all-around a bit less
confusing for me.

"InsertChildren" isn't quite right though, since you're not inserting children,
you're reorganising the features into a parent/child hierarchy rather than a
flat list. good luck with naming that...

[jshumway, 2013/07/30 23:15:50]

I'll change it here to RestructureChildren, and change the key's name to
'children' here, in manifest data source, and in the templates.

+    features = self._features
+    self._features = None
+
+    def add_subdoc(features, parent, subname, value):
+      value['name'] = subname
+      if not 'subdocs' in features[parent]:
+        features[parent]['subdocs'] = {}
+      features[parent]['subdocs'][subname] = value
+
+    def insert_sub_docs(features):
+      for name in features.keys():
+        if '.' in name:
+          value = features.pop(name)
+          parent, subname = name.split('.', 1)
+          add_subdoc(features, parent, subname, value)
+
+      for value in features.values():
+        if 'subdocs' in value:
+          insert_sub_docs(value['subdocs'])
+
+    insert_sub_docs(features)
+    return features