Add js_interface_generator for generating extensions interfaces

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 optparse
 import os
 import shlex
 import sys
 
 from cpp_bundle_generator import CppBundleGenerator
 from cpp_generator import CppGenerator
 from cpp_type_generator import CppTypeGenerator
 from js_externs_generator import JsExternsGenerator
+from js_interface_generator import JsInterfaceGenerator
 import json_schema
 from cpp_namespace_environment import CppNamespaceEnvironment
 from model import Model
 from schema_loader import SchemaLoader
 
 # Names of supported code generators, as specified on the command-line.
 # First is default.
-GENERATORS = ['cpp', 'cpp-bundle-registration', 'cpp-bundle-schema', 'externs']
+GENERATORS = [
+  'cpp', 'cpp-bundle-registration', 'cpp-bundle-schema', 'externs', 'interface'
+]
 
 def GenerateSchema(generator_name,
                    file_paths,
                    root,
                    destdir,
                    cpp_namespace_pattern,
                    bundle_name,
                    impl_dir,
                    include_rules):
   # Merge the source files into a single list of schemas.
@@ skipping 69 matching lines @@
   elif generator_name == 'cpp':
     cpp_generator = CppGenerator(type_generator)
     generators = [
       ('%s.h' % filename_base, cpp_generator.h_generator),
       ('%s.cc' % filename_base, cpp_generator.cc_generator)
     ]
   elif generator_name == 'externs':
     generators = [
       ('%s_externs.js' % namespace.unix_name, JsExternsGenerator())
     ]
+  elif generator_name == 'interface':
+    generators = [
+      ('%s_interface.js' % namespace.unix_name, JsInterfaceGenerator())
+    ]
   else:
     raise Exception('Unrecognised generator %s' % generator_name)
 
   output_code = []
   for filename, generator in generators:
     code = generator.Generate(namespace).Render()
     if destdir:
       if generator_name == 'cpp-bundle-registration':
         # Function registrations must be output to impl_dir, since they link in
         # API implementations.
         output_dir = os.path.join(destdir, impl_dir)
       else:
         output_dir = os.path.join(destdir, src_path)
       if not os.path.exists(output_dir):
         os.makedirs(output_dir)
       with open(os.path.join(output_dir, filename), 'w') as f:
         f.write(code)
-    output_code += [filename, '', code, '']
+    if len(generators) > 1:
+      output_code += [filename, '', code, '']
+    else:
+      output_code += [code]
 
   return '\n'.join(output_code)
 
 
 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'
@@ skipping 38 matching lines @@
   include_rules = []
   if opts.include_rules:
     include_rules = map(split_path_and_namespace,
                         shlex.split(opts.include_rules))
 
   result = GenerateSchema(opts.generator, file_paths, opts.root, opts.destdir,
                           opts.namespace, opts.bundle_name, opts.impl_dir,
                           include_rules)
   if not opts.destdir:
     print result