1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
|
import os
import re
import argparse
parser = argparse.ArgumentParser()
parser.add_argument("--input")
parser.add_argument("--include-dir", nargs="+")
parser.add_argument("--output")
args = parser.parse_args()
system_includes = set()
definitions = set()
def resolve_path(file_name, relative_to):
if os.path.isabs(file_name):
return file_name
base_dir = os.path.dirname(relative_to)
result = os.path.join(base_dir, file_name)
if os.path.isfile(result):
return result
for include_dir in args.include_dir:
result = os.path.join(include_dir, file_name)
if os.path.isfile(result):
return os.path.abspath(result)
return None
def cleanup_comments(lines):
single_line_comment = re.compile(r'(?://.*)|(?:/\*.*\*/)')
multiline_comment_start = re.compile(r'/\*.*')
multiline_comment_end = re.compile(r'.*\*/')
output = []
in_multiline_comment = False
for line in lines:
if in_multiline_comment:
if multiline_comment_end.match(line):
in_multiline_comment = False
output.append(re.sub(multiline_comment_end, '', line))
else:
line = re.sub(single_line_comment, '', line)
if multiline_comment_start.search(line):
in_multiline_comment = True
line = re.sub(multiline_comment_start, '', line)
output.append(line)
return output
def is_definition_enabled(definition):
return definition in definitions
def get_definition(match_result):
for group in match_result.groups():
if group:
return group
return None
def process_include(line, base_path):
output = []
include_re = re.compile(r'^#\s*include\s+"(.+)"\s*$')
match = include_re.match(line)
if not match:
output.append(line)
else:
include_name = match.group(1)
full_file_path = resolve_path(include_name, base_path)
if full_file_path is not None:
output = preprocess_file(resolve_path(include_name, base_path))
return output
def cleanup_ifs(lines, base_path):
output = []
stack = [{
"context_enabled": True
}]
def is_context_enabled():
for ctx in stack:
if not ctx["context_enabled"]:
return False
return True
positive_re = re.compile(r'^(?:\s*(?:#\s*ifdef\s+(.+))|(?:#\s*if\s+([^!].*))|(?:#\s*elif\s+([^!].*)))$')
negative_re = re.compile(r'^(?:\s*(?:#\s*ifndef\s+(.+))|(?:#\s*if\s+!(.+))|(?:#\s*elif\s+!(.+)))$')
else_re = re.compile(r'^\s*#\s*else\s*$')
endif_re = re.compile(r'^\s*#\s*endif\s*$')
define_re = re.compile(r'^\s*#\s*define\s+([A-Za-z0-9_]+)(?:\s.*)?$')
for line in lines:
if positive_re.match(line):
match = positive_re.match(line)
definition = get_definition(match)
if line.find("elif") < 0:
stack.append({})
stack[-1]["context_enabled"] = is_definition_enabled(definition)
elif negative_re.match(line):
match = negative_re.match(line)
definition = get_definition(match)
if line.find("elif") < 0:
stack.append({})
stack[-1]["context_enabled"] = not is_definition_enabled(definition)
elif else_re.match(line):
stack[-1]["context_enabled"] = not stack[-1]["context_enabled"]
elif endif_re.match(line):
stack.pop()
elif is_context_enabled():
define_match = define_re.match(line)
if define_match is not None:
definitions.add(define_match.group(1))
output = output + process_include(line, base_path)
return output
def gather_system_includes(lines):
output = []
include_re = re.compile(r'^#\s*include <([a-zA-Z0-9_.\/]*)>\s*$')
for line in lines:
match = include_re.match(line)
if match:
system_includes.add(match.group(1))
else:
output.append(line)
return output
def preprocess_file(filename):
output_lines = []
with open(filename, 'r') as f:
output_lines = f.readlines()
output_lines = cleanup_comments(output_lines)
output_lines = cleanup_ifs(output_lines, filename)
return gather_system_includes(output_lines)
with open(args.output, "w") as outfile:
outfile.write("// This header was generated from the FFMPEG headers\n")
outfile.write("#pragma once\n\n")
output = preprocess_file(os.path.abspath(args.input))
for global_include in system_includes:
outfile.write("#include <{}>\n".format(global_include))
outfile.write("\n")
prev_len = 0
for line in output:
curr_len = len(line.strip())
if curr_len > 0 or prev_len > 0:
outfile.write(line)
prev_len = curr_len
|
