#!/usr/bin/env python2.7

# Copyright 2016 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import collections
import fnmatch
import os
import re
import sys
import yaml


_RE_API = r'(?:GPRAPI|GRPCAPI|CENSUSAPI)([^;]*);'


def list_c_apis(filenames):
  for filename in filenames:
    with open(filename, 'r') as f:
      text = f.read()
    for m in re.finditer(_RE_API, text):
      api_declaration = re.sub('[ \r\n\t]+', ' ', m.group(1))
      type_and_name, args_and_close = api_declaration.split('(', 1)
      args = args_and_close[:args_and_close.rfind(')')].strip()
      last_space = type_and_name.rfind(' ')
      last_star = type_and_name.rfind('*')
      type_end = max(last_space, last_star)
      return_type = type_and_name[0:type_end+1].strip()
      name = type_and_name[type_end+1:].strip()
      yield {'return_type': return_type, 'name': name, 'arguments': args, 'header': filename}


def headers_under(directory):
  for root, dirnames, filenames in os.walk(directory):
    for filename in fnmatch.filter(filenames, '*.h'):
      yield os.path.join(root, filename)


def mako_plugin(dictionary):
  apis = []
  headers = []

  for lib in dictionary['libs']:
    if lib['name'] in ['grpc', 'gpr']:
      headers.extend(lib['public_headers'])

  apis.extend(list_c_apis(sorted(set(headers))))
  dictionary['c_apis'] = apis


if __name__ == '__main__':
  print yaml.dump([api for api in list_c_apis(headers_under('include/grpc'))])