Docserver manifest follow up (rewrite)

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

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-from copy import deepcopy
-from operator import itemgetter
+import json
 
-from third_party.json_schema_compiler.json_parse import OrderedDict, Parse
+import features_utility as features
+from third_party.json_schema_compiler.json_parse import Parse
+
+def _ListifyAndSortDocs(features, app_name):
+  '''Convert a |feautres| dictionary, and all 'children' dictionaries, into
+  lists recursively. Sort lists first by 'level' then by name.
+  '''
+  def sort_key(item):
+    '''Key function to sort items primarily by level (according to index into
+    levels) then subsort by name.
+    '''
+    levels = ('required', 'recommended', 'only_one', 'optional')
+
+    return (levels.index(item.get('level', 'optional')), item['name'])
+
+  def convert_and_sort(features):
+    for key, value in features.items():
+      if 'example' in value:
+        value['has_example'] = True
+        example = json.dumps(value['example'])
+        if example == '{}':
+          value['example'] = '{...}'
+        elif example == '[]':
+          value['example'] = '[...]'
+        else:
+          value['example'] = example
+
+      if 'children' in value:
+        features[key]['children'] = convert_and_sort(value['children'])
+
+    return sorted(features.values(), key=sort_key)
+
+  name = features['name']
+  name['example'] = name['example'].replace('{{title}}', app_name)
+
+  return convert_and_sort(features)
+
+def _AddLevelAnnotations(features):
+  '''Add level annotations to |features|. |features| and children lists must be
+  sorted by 'level'. Annotations are added to the first item in a group of
+  features of the same 'level'.
+
+  The last item in a list has 'is_last' set to True.
+  '''
+  annotations = {
+    'required': 'Required',
+    'recommended': 'Recommended',
+    'only_one': 'Pick one (or none)',
+    'optional': 'Optional'
+  }
+
+  def add_annotation(item, annotation):
+    if not 'annotations' in item:
+      item['annotations'] = []
+    item['annotations'].insert(0, annotation)
+
+  def annotate(parent_level, features):
+    current_level = parent_level
+    for item in features:
+      level = item.get('level', 'optional')
+      if level != current_level:
+        add_annotation(item, annotations[level])
+        current_level = level
+      if 'children' in item:
+        annotate(level, item['children'])
+    if features:
+      features[-1]['is_last'] = True
+
+  annotate('required', features)
+  return features
+
+def _RestructureChildren(features):
+  '''Features whose names are of the form 'parent.child' are moved to be part
+  of the 'parent' dictionary under the key 'children'. Names are changed to
+  the 'child' section of the original name. Applied recursively so that
+  children can have children.
+  '''
+  def add_child(features, parent, child_name, value):
+    value['name'] = child_name
+    if not 'children' in features[parent]:
+      features[parent]['children'] = {}
+    features[parent]['children'][child_name] = value
+
+  def insert_children(features):
+    for name in features.keys():
+      if '.' in name:
+        value = features.pop(name)
+        parent, child_name = name.split('.', 1)
+        add_child(features, parent, child_name, value)
+
+    for value in features.values():
+      if 'children' in value:
+        insert_children(value['children'])
+
+  insert_children(features)
+  return features
 
 class ManifestDataSource(object):
-  '''Provides a template with access to manifest properties specific to apps or
-  extensions.
+  '''Provides access to the properties in manifest features.
   '''
   def __init__(self,
                compiled_fs_factory,
                file_system,
                manifest_path,
                features_path):
     self._manifest_path = manifest_path
     self._features_path = features_path
     self._file_system = file_system
     self._cache = compiled_fs_factory.Create(
         self._CreateManifestData, ManifestDataSource)
 
-  def _ApplyAppsTransformations(self, manifest):
-    manifest['required'][0]['example'] = 'Application'
-    manifest['optional'][-1]['is_last'] = True
+  def GetFeatures(self):
+    '''Returns a dictionary of the contents of |_features_path| merged with
+    |_manifest_path|.
+    '''
+    manifest_json = Parse(self._file_system.ReadSingle(self._manifest_path))
+    manifest_features = FeaturesModel.FromJson(
+        Parse(self._file_system.ReadSingle(self._features_path)))
 
-  def _ApplyExtensionsTransformations(self, manifest):
-    manifest['optional'][-1]['is_last'] = True
+    return manifest_features.MergeWith(manifest_json)
+
 
   def _CreateManifestData(self, _, content):
-    '''Take the contents of |_manifest_path| and create apps and extensions
-    versions of a manifest example based on the contents of |_features_path|.
+    '''Combine the contents of |_manifest_path| and |_features_path| and filter
+    the results into lists specific to apps or extensions for templates. Marks
+    up features with annotations.
     '''
-    def create_manifest_dict():
-      manifest_dict = OrderedDict()
-      for category in ('required', 'only_one', 'recommended', 'optional'):
-        manifest_dict[category] = []
-      return manifest_dict
+    def for_templates(manifest_features, platform):
+      return _AddLevelAnnotations(
+          _ListifyAndSortDocs(
+              _RestructureChildren(
+                  features.Filtered(manifest_features, platform)),
+              app_name=platform.capitalize()))
 
-    apps = create_manifest_dict()
-    extensions = create_manifest_dict()
+    manifest_json = Parse(self._file_system.ReadSingle(self._manifest_path))
+    manifest_features = features.MergedWith(
+        features.Parse(Parse(content)), manifest_json)
 
-    manifest_json = Parse(content)
-    features_json = Parse(self._file_system.ReadSingle(
-        self._features_path))
-
-    def add_property(feature, manifest_key, category):
-      '''If |feature|, from features_json, has the correct extension_types, add
-      |manifest_key| to either apps or extensions.
-      '''
-      added = False
-      extension_types = feature['extension_types']
-      if extension_types == 'all' or 'platform_app' in extension_types:
-        apps[category].append(deepcopy(manifest_key))
-        added = True
-      if extension_types == 'all' or 'extension' in extension_types:
-        extensions[category].append(deepcopy(manifest_key))
-        added = True
-      return added
-
-    # Property types are: required, only_one, recommended, and optional.
-    for category in manifest_json:
-      for manifest_key in manifest_json[category]:
-        # If a property is in manifest.json but not _manifest_features, this
-        # will cause an error.
-        feature = features_json[manifest_key['name']]
-        if add_property(feature, manifest_key, category):
-          del features_json[manifest_key['name']]
-
-    # All of the properties left in features_json are assumed to be optional.
-    for feature in features_json.keys():
-      item = features_json[feature]
-      # Handles instances where a features entry is a union with a whitelist.
-      if isinstance(item, list):
-        item = item[0]
-      add_property(item, {'name': feature}, 'optional')
-
-    apps['optional'].sort(key=itemgetter('name'))
-    extensions['optional'].sort(key=itemgetter('name'))
-
-    self._ApplyAppsTransformations(apps)
-    self._ApplyExtensionsTransformations(extensions)
-
-    return {'apps': apps, 'extensions': extensions}
+    return {
+      'apps': for_templates(manifest_features, 'app'),
+      'extensions': for_templates(manifest_features, 'extension')
+    }
 
   def get(self, key):
-    return self._cache.GetFromFile(self._manifest_path)[key]
+    return self._cache.GetFromFile(self._features_path)[key]