Dynamically generate a heading for Extension Docs API pages

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

 # Copyright (c) 2012 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.
 
 import copy
+import json as json_library
 import logging
 import os
 import collections
 
+import svn_constants
 import third_party.json_schema_compiler.json_parse as json_parse
 import third_party.json_schema_compiler.model as model
 import third_party.json_schema_compiler.idl_schema as idl_schema
 import third_party.json_schema_compiler.idl_parser as idl_parser
 
 def _RemoveNoDocs(item):
   if json_parse.IsDict(item):
     if item.get('nodoc', False):
       return True
     for key, value in item.items():
@@ skipping 53 matching lines @@
 def _FormatValue(value):
   """Inserts commas every three digits for integer values. It is magic.
   """
   s = str(value)
   return ','.join([s[max(0, i - 3):i] for i in range(len(s), 0, -3)][::-1])
 
 class _JSCModel(object):
   """Uses a Model from the JSON Schema Compiler and generates a dict that
   a Handlebar template can use for a data source.
   """
-  def __init__(self, json, ref_resolver, disable_refs):
+  def __init__(self,
+               json,
+               ref_resolver,
+               disable_refs,
+               availability_data_source,
+               svn_file_system):
     self._ref_resolver = ref_resolver
     self._disable_refs = disable_refs
+    self._availability_data_source = availability_data_source
+    json_string = svn_file_system.ReadSingle('%s/intro_tables.json'

[not at google - send to devlin, 2013/04/30 18:34:19]

nicer line break would be
svn_file_system.ReadSingle(
    '%s/intro_tables.json' % svn_constants.JSON_PATH)

though, you might as well just pass in the intro table directly and hold onto
that everywhere rather than the svn file system (rather than
self._svn_file_system = ... have self._intro_table =
svn_file_system.ReadSingle(...))

[epeterson, 2013/05/13 02:38:10]

Done.

+                                             % svn_constants.JSON_PATH)
+    self._intro_json = json_library.loads(json_string)
     clean_json = copy.deepcopy(json)
     if _RemoveNoDocs(clean_json):
       self._namespace = None
     else:
       _InlineDocs(clean_json)
       self._namespace = model.Namespace(clean_json, clean_json['namespace'])
 
   def _FormatDescription(self, description):
     if self._disable_refs:
       return description
     return self._ref_resolver.ResolveAllLinks(description,
                                               namespace=self._namespace.name)
 
   def _GetLink(self, link):
     if self._disable_refs:
       type_name = link.split('.', 1)[-1]
       return { 'href': '#type-%s' % type_name, 'text': link, 'name': link }
     return self._ref_resolver.SafeGetLink(link, namespace=self._namespace.name)
 
   def ToDict(self):
     if self._namespace is None:
       return {}
     return {
       'name': self._namespace.name,
+      'description': self._namespace.description,
+      'availability': self._GetAvailability(),
+      'experimental': self._CheckExperimental(),
+      'intro_permissions': self._GetPermissions(),
+      'learn_more': self._GetMoreLearning(),
       'types': self._GenerateTypes(self._namespace.types.values()),
       'functions': self._GenerateFunctions(self._namespace.functions),
       'events': self._GenerateEvents(self._namespace.events),
       'properties': self._GenerateProperties(self._namespace.properties)
     }
 
+  def _GetAvailability(self):
+    """Finds the earliest stable version of chrome where an API was available
+    using AvailabilityDataSource. If an API hasn't been released to stable yet,
+    then the development channel that the API is currently available on will
+    be returned instead.
+    """
+    if not self._CheckExperimental():
+      return self._availability_data_source.GetAvailability(
+          self._namespace.name)
+    # A special message for experimental APIs' availability will be displayed.
+    return None
+
+  def _CheckExperimental(self):
+     return self._namespace.name.startswith('experimental')
+
+  def _GetPermissions(self):
+    """This is a temporary fix for generating API intro tables automatically.
+    Information on an API's permissions is pulled from a json file so that it
+    can be sent to the templates along with other relevant intro data.
+    """
+    table_info = self._intro_json.get(self._namespace.name, None)
+    try:
+      return table_info[0]['Permissions']
+    except:
+      # The intro-table will display a "Permissions: None" message.
+      return None

[not at google - send to devlin, 2013/04/30 18:34:19]

pls don't use exceptions for control flow. Also assuming that the permissions
come first is asking for a confused engineer at some point.

Something like:

permission_rows = [row for row in tab_info if 'Permissions' in row]
return permission_rows[0] if permission_rows else None

[epeterson, 2013/05/13 02:38:10]

Done.

+
+  def _GetMoreLearning(self):
+    """We can't automatically generated the "Learn more" field in an API's.
+    intro table; instead, we pull it from a json file so that it can be sent to
+    the templates along with other relevant intro data.
+    """
+    table_info = self._intro_json.get(self._namespace.name, None)
+    try:
+      return table_info[1]['Learn more']
+    except:
+      # Not all APIs have "Learn more" information.
+      return None

[not at google - send to devlin, 2013/04/30 18:34:19]

ditto regarding the filtering, not assuming it's there, not excepting, not using
[1].

but like I said, maybe this should actually return a list so that the templates
can lay it out nicely.

[epeterson, 2013/05/13 02:38:10]

Done.

+
   def _GenerateTypes(self, types):
     return [self._GenerateType(t) for t in types]
 
   def _GenerateType(self, type_):
     type_dict = {
       'name': type_.simple_name,
       'description': self._FormatDescription(type_.description),
       'properties': self._GenerateProperties(type_.properties),
       'functions': self._GenerateFunctions(type_.functions),
       'events': self._GenerateEvents(type_.events),
@@ skipping 166 matching lines @@
     self._samples = samples
 
   def get(self, key):
     return self._samples.FilterSamples(key, self._api_name)
 
 class APIDataSource(object):
   """This class fetches and loads JSON APIs from the FileSystem passed in with
   |compiled_fs_factory|, so the APIs can be plugged into templates.
   """
   class Factory(object):
-    def __init__(self, compiled_fs_factory, base_path):
+    def __init__(self,
+                 compiled_fs_factory,
+                 base_path,
+                 availability_data_source_factory,
+                 svn_file_system):
       def create_compiled_fs(fn, category):
         return compiled_fs_factory.Create(fn, APIDataSource, category=category)
 
       self._permissions_cache = create_compiled_fs(self._LoadPermissions,
                                                    'permissions')
 
       self._json_cache = create_compiled_fs(
           lambda api_name, api: self._LoadJsonAPI(api, False),
           'json')
       self._idl_cache = create_compiled_fs(
           lambda api_name, api: self._LoadIdlAPI(api, False),
           'idl')
 
       # These caches are used if an APIDataSource does not want to resolve the
       # $refs in an API. This is needed to prevent infinite recursion in
       # ReferenceResolver.
       self._json_cache_no_refs = create_compiled_fs(
           lambda api_name, api: self._LoadJsonAPI(api, True),
           'json-no-refs')
       self._idl_cache_no_refs = create_compiled_fs(
           lambda api_name, api: self._LoadIdlAPI(api, True),
           'idl-no-refs')
 
       self._idl_names_cache = create_compiled_fs(self._GetIDLNames, 'idl-names')
       self._names_cache = create_compiled_fs(self._GetAllNames, 'names')
 
       self._base_path = base_path
-
+      self._availability_data_source = availability_data_source_factory.Create()
+      self._svn_file_system = svn_file_system
       # These must be set later via the SetFooDataSourceFactory methods.
       self._ref_resolver_factory = None
       self._samples_data_source_factory = None
 
     def SetSamplesDataSourceFactory(self, samples_data_source_factory):
       self._samples_data_source_factory = samples_data_source_factory
 
     def SetReferenceResolverFactory(self, ref_resolver_factory):
       self._ref_resolver_factory = ref_resolver_factory
 
@@ skipping 25 matching lines @@
                            samples,
                            disable_refs)
 
     def _LoadPermissions(self, file_name, json_str):
       return json_parse.Parse(json_str)
 
     def _LoadJsonAPI(self, api, disable_refs):
       return _JSCModel(
           json_parse.Parse(api)[0],
           self._ref_resolver_factory.Create() if not disable_refs else None,
-          disable_refs).ToDict()
+          disable_refs,
+          self._availability_data_source,
+          self._svn_file_system).ToDict()
 
     def _LoadIdlAPI(self, api, disable_refs):
       idl = idl_parser.IDLParser().ParseData(api)
       return _JSCModel(
           idl_schema.IDLSchema(idl).process()[0],
           self._ref_resolver_factory.Create() if not disable_refs else None,
-          disable_refs).ToDict()
+          disable_refs,
+          self._availability_data_source,
+          self._svn_file_system).ToDict()
 
     def _GetIDLNames(self, base_dir, apis):
       return self._GetExtNames(apis, ['idl'])
 
     def _GetAllNames(self, base_dir, apis):
       return self._GetExtNames(apis, ['json', 'idl'])
 
     def _GetExtNames(self, apis, exts):
       return [model.UnixName(os.path.splitext(api)[0]) for api in apis
               if os.path.splitext(api)[1][1:] in exts]
@@ skipping 56 matching lines @@
     return feature_data
 
   def _GenerateHandlebarContext(self, handlebar_dict, path):
     handlebar_dict['permissions'] = self._GetFeatureData(path)
     handlebar_dict['samples'] = _LazySamplesGetter(path, self._samples)
     return handlebar_dict
 
   def _GetAsSubdirectory(self, name):
     if name.startswith('experimental_'):
       parts = name[len('experimental_'):].split('_', 1)
-      parts[1] = 'experimental_%s' % parts[1]
-      return '/'.join(parts)
+      if len(parts) > 1:
+        parts[1] = 'experimental_%s' % parts[1]
+        return '/'.join(parts)
+      else:
+        return '%s/%s' % (parts[0], name)
     return name.replace('_', '/', 1)
 
-  def get(self, key):
+  def _DetermineNamesForGet(self, key):
     if key.endswith('.html') or key.endswith('.json') or key.endswith('.idl'):
       path, ext = os.path.splitext(key)
     else:
       path = key
     unix_name = model.UnixName(path)
-    idl_names = self._idl_names_cache.GetFromFileListing(self._base_path)
     names = self._names_cache.GetFromFileListing(self._base_path)
     if unix_name not in names and self._GetAsSubdirectory(unix_name) in names:
       unix_name = self._GetAsSubdirectory(unix_name)
+    return (path, unix_name)
 
+  def _DetermineCacheForGet(self, unix_name):
+    idl_names = self._idl_names_cache.GetFromFileListing(self._base_path)
     if self._disable_refs:
       cache, ext = (
           (self._idl_cache_no_refs, '.idl') if (unix_name in idl_names) else
           (self._json_cache_no_refs, '.json'))
     else:
       cache, ext = ((self._idl_cache, '.idl') if (unix_name in idl_names) else
                     (self._json_cache, '.json'))
+    return (cache, ext)
+
+  def get(self, key):
+    path, unix_name = self._DetermineNamesForGet(key)
+    cache, ext = self._DetermineCacheForGet(unix_name)
     return self._GenerateHandlebarContext(
         cache.GetFromFile('%s/%s%s' % (self._base_path, unix_name, ext)),
         path)