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1#!/usr/bin/env python
2#
3# Copyright 2016 Google Inc.
4#
5# Use of this source code is governed by a BSD-style license that can be
6# found in the LICENSE file.
7
8from __future__ import print_function
9
10import collections
11import json
12import os
13import subprocess
14import sys
15
16# Finds all public sources in include directories then write them to skia.h.
17
18# Also write skia.h.deps, which Ninja uses to track dependencies. It's the
19# very same mechanism Ninja uses to know which .h files affect which .cpp files.
20
21os.system("rm ../../.gn")
22os.system("ln -s third_party/skia/.gn ../../.gn")
23
24gn              = sys.argv[1]
25absolute_source = sys.argv[2]
26skia_h          = sys.argv[3]
27include_dirs    = sys.argv[4:]
28
29absolute_source = os.path.normpath(absolute_source)
30
31include_dirs = [os.path.join(os.path.normpath(include_dir), '')
32                for include_dir in include_dirs]
33include_dirs.sort(key=len, reverse=True)
34
35gn_desc_cmd = [gn, 'desc', '.', '--root=%s' % absolute_source, '--format=json',
36               '*']
37
38desc_json_txt = ''
39try:
40  desc_json_txt = subprocess.check_output(gn_desc_cmd).decode('utf-8')
41except subprocess.CalledProcessError as e:
42  print(e.output.decode('utf-8'))
43  raise
44
45begin_index = desc_json_txt.index("{")
46desc_json_txt = desc_json_txt[begin_index:]
47
48desc_json = {}
49try:
50  desc_json = json.loads(desc_json_txt)
51except ValueError:
52  print(desc_json_txt)
53  raise
54
55sources = set()
56
57for target in desc_json.values():
58  # We'll use `public` headers if they're listed, or pull them from `sources`
59  # if not.  GN sneaks in a default "public": "*" into the JSON if you don't
60  # set one explicitly.
61  search_list = target.get('public')
62  if search_list == '*':
63    search_list = target.get('sources', [])
64
65  for name in search_list:
66    sources.add(os.path.join(absolute_source, os.path.normpath(name[2:])))
67
68Header = collections.namedtuple('Header', ['absolute', 'include'])
69headers = {}
70for source in sources:
71  source_as_include = [os.path.relpath(source, absolute_source)
72                       for include_dir in include_dirs
73                       if source.startswith(include_dir)]
74  if not source_as_include:
75    continue
76  statinfo = os.stat(source)
77  key = str(statinfo.st_ino) + ':' + str(statinfo.st_dev)
78  # On Windows os.stat st_ino is 0 until 3.3.4 and st_dev is 0 until 3.4.0.
79  if key == '0:0':
80    key = source
81  include_path = source_as_include[0]
82  if key not in headers or len(include_path) < len(headers[key].include):
83    headers[key] = Header(source, include_path)
84
85headers = sorted(headers.values(), key=lambda x: x.include)
86
87with open(skia_h, 'w') as f:
88  f.write('// skia.h generated by GN.\n')
89  f.write('#ifndef skia_h_DEFINED\n')
90  f.write('#define skia_h_DEFINED\n')
91  for header in headers:
92    f.write('#include "' + header.include + '"\n')
93  f.write('#endif//skia_h_DEFINED\n')
94
95with open(skia_h + '.deps', 'w') as f:
96  f.write(skia_h + ':')
97  for header in headers:
98    f.write(' ' + header.absolute)
99  f.write(' build.ninja.d')
100  f.write('\n')
101
102# Temporary: during development this file wrote skia.h.d, not skia.h.deps,
103# and I think we have some bad versions of those files laying around.
104if os.path.exists(skia_h + '.d'):
105  os.remove(skia_h + '.d')
106
107os.system("rm ../../.gn")
108os.system("ln -s build/core/gn/dotfile.gn ../../.gn")
109