Code generation for extensions api

tools/json_schema_compiler/compiler.py

+#!/usr/bin/env python
+# 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.
+"""Generator for C++ structs from api json files.
+
+The purpose of this tool is to remove the need for hand-written code that
+converts to and from base::Value types when receiving javascript api calls.
+Originally written for generating code for extension apis. Reference schemas
+are in chrome/common/extensions/api.
+
+Usage example:
+  compiler.py --root /home/Work/src --namespace extensions windows.json
+    tabs.json
+  compiler.py --destdir gen --suffix _api --root /home/Work/src
+    --namespace extensions windows.json tabs.json
+"""
+
+import cpp_util
+import cc_generator
+import cpp_type_generator
+import h_generator
+import json
+import model
+import optparse
+import os.path
+import sys
+
+if __name__ == '__main__':
+  parser = optparse.OptionParser(
+      description='Generates a C++ model of an API from JSON schema',
+      usage='usage: %prog [option]... schema [referenced_schema]...')
+  parser.add_option('-r', '--root', default='.',
+      help='logical include root directory. Path to schema files from specified'
+      'dir will be the include path.')
+  parser.add_option('-d', '--destdir',
+      help='root directory to output generated files.')
+  parser.add_option('-n', '--namespace', default='generated_api_schemas',
+      help='C++ namespace for generated files. e.g extensions::api.')
+  parser.add_option('-s', '--suffix', default='',
+      help='Filename and C++ namespace suffix for generated files.')
+
+  (opts, args) = parser.parse_args()
+  if not args:
+    sys.exit(parser.get_usage())
+  dest_dir = opts.destdir
+  root_namespace = opts.namespace
+  filename_suffix = opts.suffix
+
+  schema = os.path.normpath(args[0])
+  referenced_schemas = args[1:]
+
+  api_model = model.Model()
+
+  # Load type dependencies into the model.
+  for referenced_schema_path in referenced_schemas:
+    with open(referenced_schema_path, 'r') as referenced_schema_file:
+      referenced_api_defs = json.loads(referenced_schema_file.read())
+
+    for namespace in referenced_api_defs:
+      api_model.AddNamespace(namespace,
+          os.path.relpath(referenced_schema_path, opts.root))
+
+  # Actually generate for source file.
+  with open(schema, 'r') as schema_file:
+    api_defs = json.loads(schema_file.read())
+
+  for target_namespace in api_defs:
+    # Gets the relative path from opts.root to the schema to correctly determine
+    # the include path.
+    relpath = os.path.relpath(schema, opts.root)
+    namespace = api_model.AddNamespace(target_namespace, relpath)
+    if not namespace:
+      continue
+
+    out_file = cpp_util.CppName(namespace.name).lower() + filename_suffix
+    type_generator = cpp_type_generator.CppTypeGenerator(root_namespace,
+                                                         namespace, out_file)
+    for referenced_namespace in api_model.namespaces.values():
+      type_generator.AddNamespace(referenced_namespace,
+          cpp_util.CppName(referenced_namespace.name).lower() + filename_suffix)
+    cc_generator = cc_generator.CCGenerator(namespace, type_generator)
+    cc_code = cc_generator.Generate().Render()
+    h_generator = h_generator.HGenerator(namespace, type_generator)
+    h_code = h_generator.Generate().Render()
+
+    if dest_dir:
+      with open(os.path.join(dest_dir, namespace.source_file_dir,
+          out_file + '.cc'), 'w') as cc_file:
+        cc_file.write(cc_code)
+      with open(os.path.join(dest_dir, namespace.source_file_dir,
+          out_file + '.h'), 'w') as h_file:
+        h_file.write(h_code)
+    else:
+      print '%s.h' % out_file
+      print
+      print h_code
+      print
+      print '%s.cc' % out_file
+      print
+      print cc_code