[Schema Compiler] Separate out SchemaLoader and namespace resolving

tools/json_schema_compiler/schema_loader.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 os
-import re
 import sys
 
 import idl_schema
 import json_schema
-from cpp_namespace_environment import CppNamespaceEnvironment
-from model import Model, UnixName
-
-def GenerateFilenames(full_namespace):
-  # Try to find the file defining the namespace. Eg. for
-  # nameSpace.sub_name_space.Type' the following heuristics looks for:
-  # 1. name_space_sub_name_space.json,
-  # 2. name_space_sub_name_space.idl,
-  # 3. sub_name_space.json,
-  # 4. sub_name_space.idl,
-  # 5. etc.
-  sub_namespaces = full_namespace.split('.')
-  filenames = [ ]
-  basename = None
-  for namespace in reversed(sub_namespaces):
-    if basename is not None:
-      basename = UnixName(namespace + '.' + basename)
-    else:
-      basename = UnixName(namespace)
-    for ext in ['json', 'idl']:
-      filenames.append('%s.%s' % (basename, ext))
-  return filenames
 
 class SchemaLoader(object):
-  '''Resolves a type name into the namespace the type belongs to.
-
-  Properties:
-  - |root| path to the root directory.
-  - |path| path to the directory with the API header files, relative to the
-    root.
-  - |include_rules| List containing tuples with (path, cpp_namespace_pattern)
-    used when searching for types.
-  - |cpp_namespace_pattern| Default namespace pattern
+  '''Loads a schema from a provided filename.
+  |root|: path to the root directory.
   '''
-  def __init__(self,
-               root,
-               path,
-               include_rules,
-               cpp_namespace_pattern):
+  def __init__(self, root):
     self._root = root
-    self._include_rules = [(path, cpp_namespace_pattern)]
-    self._include_rules.extend(include_rules)
-
-  def ResolveNamespace(self, full_namespace):
-    filenames = GenerateFilenames(full_namespace)
-    for path, cpp_namespace in self._include_rules:
-      cpp_namespace_environment = None
-      if cpp_namespace:
-        cpp_namespace_environment = CppNamespaceEnvironment(cpp_namespace)
-      for filename in reversed(filenames):
-        filepath = os.path.join(path, filename);
-        if os.path.exists(os.path.join(self._root, filepath)):
-          return Model().AddNamespace(
-              self.LoadSchema(filepath)[0],
-              filepath,
-              environment=cpp_namespace_environment)
-    return None
-
-  def ResolveType(self, full_name, default_namespace):
-    name_parts = full_name.rsplit('.', 1)
-    if len(name_parts) == 1:
-      if full_name not in default_namespace.types:
-        return None
-      return default_namespace
-    full_namespace, type_name = full_name.rsplit('.', 1)
-    namespace = self.ResolveNamespace(full_namespace)
-    if namespace and type_name in namespace.types:
-      return namespace
-    return None
 
   def LoadSchema(self, schema):
     '''Load a schema definition. The schema parameter must be a file name
     with the full path relative to the root.'''
     _, schema_extension = os.path.splitext(schema)
 
     schema_path = os.path.join(self._root, schema)
     if schema_extension == '.json':
       api_defs = json_schema.Load(schema_path)
     elif schema_extension == '.idl':
       api_defs = idl_schema.Load(schema_path)
     else:
       sys.exit('Did not recognize file extension %s for schema %s' %
                (schema_extension, schema))
 
+    # TODO(devlin): This returns a list. Does it need to? Is it ever > 1?
     return api_defs