#! /usr/bin/env python
# Copyright (c) 2017 Cisco and/or its affiliates.
# 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 os
import subprocess
import re
import sys
import pprint

def parseLocation(location):
  token = location.split("[")
  objectFileName = location

  if len(token) > 1:
    libraryName = token[0]
    objectFileName = token[1].split("]")[0]
  else:
    libraryName = None

  objectFileName = objectFileName.split(":")[0]
  return (libraryName, objectFileName)

def parseDarwinOutput(lines, accumulator = { }):

  for line in lines:
    token = line.split(" ")
    fullName = token[0]

    libraryName, objectFileName = parseLocation(token[0])
    name = token[1]
    type = token[2]
    if fullName in accumulator:
      if type == "U":
        accumulator[fullName]["undefined"].append({ "name" : name })
      elif type == "T":
        accumulator[fullName]["defined"].append({ "name" : name })
      elif type == "D":
        accumulator[fullName]["globalData"].append({ "name" : name })
    else:
      accumulator[fullName] = { "fullName" : fullName, "libraryName" : libraryName, "objectFileName" : objectFileName, "defined" : [], "undefined" : [], "globalData" : [] }

  return accumulator

def getDarwinSymbolTable(objectFileName, accumulator = { }):
  command = [ "/usr/bin/nm", "-PAog", objectFileName ]

  output = subprocess.check_output(command)
  lines = output.splitlines()
  return parseDarwinOutput(lines, accumulator)


def getSymbolTable(objectFileName, accumulator = { }):
  '''
  {
    fullName : { "defined" : list of dictionaries,
                 "undefined": list of dictionaries,
                 "globalData" : list of dictionaries,
                 "libraryName" : string
                 "objectFileName : string
               },
  }
  '''
  return getDarwinSymbolTable(objectFileName, accumulator)


if __name__ == '__main__':

  table = dict()
  for f in sys.argv:
    table = getSymbolTable(f, table)

  pp = pprint.PrettyPrinter(indent=4, width=132)

  pp.pprint(table)