#!/usr/bin/python

# Copyright 2015 Tomas Popela <tpopela@redhat.com>

# Permission is hereby granted, free of charge, to any person obtaining

# a copy of this software and associated documentation files (the

# "Software"), to deal in the Software without restriction, including

# without limitation the rights to use, copy, modify, merge, publish,

# distribute, sublicense, and/or sell copies of the Software, and to

# permit persons to whom the Software is furnished to do so, subject to

# the following conditions:

#

# The above copyright notice and this permission notice shall be included

# in all copies or substantial portions of the Software.

#

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY

# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

import sys

import re

def append_sources (input_sources, output_sources):

  # Get the source files.

  source_files = re.findall(r"\"(.*?)\"", input_sources)

  output_sources += source_files

def parse_sources(input_sources, output_sources, arch_not_arm):

  # Get the type of sources in one group and sources itself in the other one.

  blocks = re.findall(r"(ffmpeg[^\s]*).*?\[(.*?)]", input_sources, re.DOTALL)

  for block in blocks:

    if (arch_not_arm):

      if not 'ffmpeg_gas_sources' in block[0]:

        append_sources (block[1], output_sources)

    else:

      append_sources (block[1], output_sources)

def parse_ffmpeg_gyni_file(gyni_path, arch_not_arm):

  with open(gyni_path, "r") as input_file:

    content = input_file.read().replace('\n', '')

  output_sources = []

  # Get all the sections.

  sections = re.findall(r"if (.*?})", content, re.DOTALL)

  for section in sections:

    # Get all the conditions (first group) and sources (second group) for the

    # current section.

    blocks = re.findall(r"(\(.*?\))\s\{(.*?)\}", section, re.DOTALL)

    for block in blocks:

      conditions = re.findall(r"\(?\((.*?)\)", block[0])

      inserted = False

      for condition in conditions:

        if inserted:

          break

        limitations = ['ffmpeg_branding == "Chrome"', 'ffmpeg_branding == "ChromeOS"']

        if ('use_linux_config' in condition) and not any(limitation in condition for limitation in limitations):

          if (arch_not_arm):

            if ('x64' in condition) or ('x86' in condition):

              parse_sources (block[1], output_sources, arch_not_arm)

              inserted = True

          else:

            parse_sources (block[1], output_sources, arch_not_arm)

            inserted = True

  if len(output_sources) == 0:

    sys.stderr.write("Something went wrong, no sources parsed!\n")

    sys.exit(1)

  print ' '.join(output_sources)

if __name__ == "__main__":

  path = "%s/third_party/ffmpeg/ffmpeg_generated.gni" % sys.argv[1]

  parse_ffmpeg_gyni_file (path, False if sys.argv[2] == "0" else True)