Initial commit of the Dart Chrome Extension APIs generators

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 --root /home/Work/src
     --namespace extensions windows.json tabs.json
 """
 
 import cc_generator
 import cpp_type_generator
 import h_generator
+import dart_generator
 import idl_schema
 import json_schema
 import model
 import schema_bundle_generator
 
 import optparse
 import os.path
 import sys
 
+# list of supported languages to build; first is default
+SUPPORTED_LANGS = ['c++', 'dart']
+
 def load_schema(schema):
   schema_filename, schema_extension = os.path.splitext(schema)
 
   if schema_extension == '.json':
     api_defs = json_schema.Load(schema)
   elif schema_extension == '.idl':
     api_defs = idl_schema.Load(schema)
   else:
     sys.exit("Did not recognize file extension %s for schema %s" %
              (schema_extension, schema))
   if len(api_defs) != 1:
     sys.exit("File %s has multiple schemas. Files are only allowed to contain a"
              " single schema." % schema)
 
   return api_defs
 
-def handle_single_schema(filename, dest_dir, root, root_namespace):
+def handle_single_schema(filename, dest_dir, root, root_namespace, lang,
+    hooks_file):
   schema = os.path.normpath(filename)
   schema_filename, schema_extension = os.path.splitext(schema)
   path, short_filename = os.path.split(schema_filename)
   api_defs = json_schema.DeleteNocompileNodes(load_schema(schema))
 
   api_model = model.Model()
 
   for target_namespace in api_defs:
     referenced_schemas = target_namespace.get('dependencies', [])
     # Load type dependencies into the model.
@@ skipping 21 matching lines @@
     if not namespace:
       continue
 
     if short_filename != namespace.unix_name:
       sys.exit("Filename %s is illegal. Name files using unix_hacker style." %
                filename)
 
     # The output filename must match the input filename for gyp to deal with it
     # properly.
     out_file = namespace.unix_name
-    type_generator = cpp_type_generator.CppTypeGenerator(
-        root_namespace, namespace, namespace.unix_name)
-    for referenced_namespace in api_model.namespaces.values():
-      if referenced_namespace == namespace:
-        continue
-      type_generator.AddNamespace(
-          referenced_namespace,
-          referenced_namespace.unix_name)
 
-    h_code = (h_generator.HGenerator(namespace, type_generator)
-        .Generate().Render())
-    cc_code = (cc_generator.CCGenerator(namespace, type_generator)
-        .Generate().Render())
+    if lang.lower() == 'c++':

[benwells, 2013/01/25 03:15:32]

I don't think this is needed now, but it would be nice to have factorize out
this if and the one below into a separate class - lang_generator maybe.

+      type_generator = cpp_type_generator.CppTypeGenerator(
+          root_namespace, namespace, namespace.unix_name)
+      for referenced_namespace in api_model.namespaces.values():
+        if referenced_namespace == namespace:
+          continue
+        type_generator.AddNamespace(
+            referenced_namespace,
+            referenced_namespace.unix_name)
 
-    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)
+      h_code = (h_generator.HGenerator(namespace, type_generator)
+          .Generate().Render())
+      cc_code = (cc_generator.CCGenerator(namespace, type_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

[benwells, 2013/01/25 03:15:32]

You can factorize out the if dest_dir ... else: .... part and use it three times
(cc, h and dart).

+        print
+        print h_code
+        print
+        print '%s.cc' % out_file
+        print
+        print cc_code
+
+    elif lang.lower() == 'dart':
+      dart_code = (dart_generator.DartGenerator(namespace, hooks_file)
+          .Generate().Render())
+
+      if dest_dir:
+        with open(os.path.join(dest_dir, out_file + '.dart'), 'w') as dart_file:
+          dart_file.write(dart_code)
+      else:
+        print '%s.dart' % out_file
+        print
+        print dart_code
+
     else:
-      print '%s.h' % out_file
-      print
-      print h_code
-      print
-      print '%s.cc' % out_file
-      print
-      print cc_code
+      raise Exception("Unrecognised language %s. Supported languages are %s." %
+        (lang, SUPPORTED_LANGS))
 
-def handle_bundle_schema(filenames, dest_dir, root, root_namespace):
+def handle_bundle_schema(filenames, dest_dir, root, root_namespace, lang):
   # Merge the source files into a single list of schemas.
   api_defs = []
   for filename in filenames:
     schema = os.path.normpath(filename)
     schema_filename, schema_extension = os.path.splitext(schema)
     api_defs.extend(load_schema(schema))
 
   api_model = model.Model()
   relpath = os.path.relpath(os.path.normpath(filenames[0]), root)
 
   for target_namespace, schema_filename in zip(api_defs, filenames):
     namespace = api_model.AddNamespace(target_namespace, relpath)
     path, filename = os.path.split(schema_filename)
     short_filename, extension = os.path.splitext(filename)
 
     # Filenames are checked against the unix_names of the namespaces they
     # generate because the gyp uses the names of the JSON files to generate
     # the names of the .cc and .h files. We want these to be using unix_names.
     if namespace.unix_name != short_filename:
       sys.exit("Filename %s is illegal. Name files using unix_hacker style." %
                schema_filename)
 
-  type_generator = cpp_type_generator.CppTypeGenerator(root_namespace)
-  for referenced_namespace in api_model.namespaces.values():
-    type_generator.AddNamespace(
-        referenced_namespace,
-        referenced_namespace.unix_name)
+  if lang == "c++":
+    type_generator = cpp_type_generator.CppTypeGenerator(root_namespace)
+    for referenced_namespace in api_model.namespaces.values():
+      type_generator.AddNamespace(
+          referenced_namespace,
+          referenced_namespace.unix_name)
 
-  generator = schema_bundle_generator.SchemaBundleGenerator(
-      api_model, api_defs, type_generator)
-  api_h_code = generator.GenerateAPIHeader().Render()
-  schemas_h_code = generator.GenerateSchemasHeader().Render()
-  schemas_cc_code = generator.GenerateSchemasCC().Render()
+    generator = schema_bundle_generator.SchemaBundleGenerator(
+        api_model, api_defs, type_generator)
+    api_h_code = generator.GenerateAPIHeader().Render()
+    schemas_h_code = generator.GenerateSchemasHeader().Render()
+    schemas_cc_code = generator.GenerateSchemasCC().Render()
 
-  if dest_dir:
-    basedir = os.path.join(dest_dir, 'chrome/common/extensions/api')
-    with open(os.path.join(basedir, 'generated_api.h'), 'w') as h_file:
-      h_file.write(api_h_code)
-    with open(os.path.join(basedir, 'generated_schemas.h'), 'w') as h_file:
-      h_file.write(schemas_h_code)
-    with open(os.path.join(basedir, 'generated_schemas.cc'), 'w') as cc_file:
-      cc_file.write(schemas_cc_code)
+    if dest_dir:
+      basedir = os.path.join(dest_dir, 'chrome/common/extensions/api')
+      with open(os.path.join(basedir, 'generated_api.h'), 'w') as h_file:
+        h_file.write(api_h_code)
+      with open(os.path.join(basedir, 'generated_schemas.h'), 'w') as h_file:
+        h_file.write(schemas_h_code)
+      with open(os.path.join(basedir, 'generated_schemas.cc'), 'w') as cc_file:
+        cc_file.write(schemas_cc_code)
+    else:
+      print 'generated_api.h'
+      print
+      print api_h_code
+      print
+      print 'generated_schemas.h'
+      print
+      print schemas_h_code
+      print
+      print 'generated_schemas.cc'
+      print
+      print schemas_cc_code
+
+  elif lang == "dart":
+    raise Exception("Dart is not supported in bundle mode.")
+
   else:
-    print 'generated_api.h'
-    print
-    print api_h_code
-    print
-    print 'generated_schemas.h'
-    print
-    print schemas_h_code
-    print
-    print 'generated_schemas.cc'
-    print
-    print schemas_cc_code
+    raise Exception("Unrecognised language %s. Supported languages are %s." %
+      (lang, SUPPORTED_LANGS))
+
 
 if __name__ == '__main__':
   parser = optparse.OptionParser(
       description='Generates a C++ model of an API from JSON schema',
       usage='usage: %prog [option]... 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('-b', '--bundle', action="store_true", help=
 '''if supplied, causes compiler to generate bundle files for the given set of
 source files.''')
+  parser.add_option('-l', '--lang', default=SUPPORTED_LANGS[0],
+      help=
+'''The language to generate the output in. Currently supported options are
+%s.''' % SUPPORTED_LANGS)
+  parser.add_option("-H", "--hooks-file", dest="hooks_file",

[benwells, 2013/01/25 03:15:32]

We should talk about custom hooks offline, I'm not sure why they are being
passed in.

+      help="Adds custom hooks from the given file (Dart only).", metavar="FILE")
 
   (opts, args) = parser.parse_args()
 
   if not args:
     sys.exit(0) # This is OK as a no-op
   dest_dir = opts.destdir
   root_namespace = opts.namespace
 
   if opts.bundle:
-    handle_bundle_schema(args, dest_dir, opts.root, root_namespace)
+    handle_bundle_schema(args, dest_dir, opts.root, root_namespace, opts.lang)
   else:
-    handle_single_schema(args[0], dest_dir, opts.root, root_namespace)
+    handle_single_schema(args[0], dest_dir, opts.root, root_namespace,
+        opts.lang, opts.hooks_file)