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# Copyright (c) 2012 Google Inc. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import collections
import os
import gyp
import gyp.common
import gyp.msvs_emulation
import json
import sys

generator_supports_multiple_toolsets = True

generator_wants_static_library_dependencies_adjusted = False

generator_default_variables = {
}
for dirname in ['INTERMEDIATE_DIR', 'SHARED_INTERMEDIATE_DIR', 'PRODUCT_DIR',
                'LIB_DIR', 'SHARED_LIB_DIR']:
  # Some gyp steps fail if these are empty(!).
  generator_default_variables[dirname] = 'dir'
for unused in ['RULE_INPUT_PATH', 'RULE_INPUT_ROOT', 'RULE_INPUT_NAME',
               'RULE_INPUT_DIRNAME', 'RULE_INPUT_EXT',
               'EXECUTABLE_PREFIX', 'EXECUTABLE_SUFFIX',
               'STATIC_LIB_PREFIX', 'STATIC_LIB_SUFFIX',
               'SHARED_LIB_PREFIX', 'SHARED_LIB_SUFFIX',
               'CONFIGURATION_NAME']:
  generator_default_variables[unused] = ''


def CalculateVariables(default_variables, params):
  generator_flags = params.get('generator_flags', {})
  for key, val in generator_flags.items():
    default_variables.setdefault(key, val)
  default_variables.setdefault('OS', gyp.common.GetFlavor(params))

  flavor = gyp.common.GetFlavor(params)
  if flavor =='win':
    # Copy additional generator configuration data from VS, which is shared
    # by the Windows Ninja generator.
    import gyp.generator.msvs as msvs_generator
    generator_additional_non_configuration_keys = getattr(msvs_generator,
        'generator_additional_non_configuration_keys', [])
    generator_additional_path_sections = getattr(msvs_generator,
        'generator_additional_path_sections', [])

    gyp.msvs_emulation.CalculateCommonVariables(default_variables, params)


def CalculateGeneratorInputInfo(params):
  """Calculate the generator specific info that gets fed to input (called by
  gyp)."""
  generator_flags = params.get('generator_flags', {})
  if generator_flags.get('adjust_static_libraries', False):
    global generator_wants_static_library_dependencies_adjusted
    generator_wants_static_library_dependencies_adjusted = True

def GetOS(params):
  for d in params['defines']:
    pass

def GenerateOutput(target_list, target_dicts, data, params):
  # Map of target -> list of targets it depends on.
  edges = {}

  # Queue of targets to visit.
  targets_to_visit = target_list[:]

  sources = [];

  while len(targets_to_visit) > 0:
    target = targets_to_visit.pop()
    if target in edges:
      continue
    edges[target] = []

    target_sources = target_dicts[target].get('sources')
    if target_sources:
      for source in target_sources:
        if source.endswith('.cpp'):
          sources.append(source)

    for dep in target_dicts[target].get('dependencies', []):
      edges[target].append(dep)
      targets_to_visit.append(dep)

  skia_os = data['gyp/core.gyp']['variables']['skia_os%']

  f = open('sources.json', 'w')
  json.dump(sources, f)
  f.close()