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#!/usr/bin/python
# Copyright (c) 2017-2019, The Tor Project, Inc.
# See LICENSE for licensing information
import re
LINE_OBVIOUSNESS_LIMIT = 4
class Problem(Exception):
pass
def uncomment(s):
s = re.sub(r'//.*','',s)
s = re.sub(r'/\*.*','',s)
return s.strip()
def translate(f_in, f_out):
whole_file = []
stack = []
cur_level = whole_file
lineno = 0
for line in f_in:
lineno += 1
m = re.match(r'\s*#\s*(if|ifdef|ifndef|else|endif|elif)\b\s*(.*)',
line)
if not m:
f_out.write(line)
continue
command,rest = m.groups()
if command in ("if", "ifdef", "ifndef"):
# The #if directive pushes us one level lower on the stack.
if command == 'ifdef':
rest = "defined(%s)"%uncomment(rest)
elif command == 'ifndef':
rest = "!defined(%s)"%uncomment(rest)
elif rest.endswith("\\"):
rest = rest[:-1]+"..."
rest = uncomment(rest)
new_level = [ (command, rest, lineno) ]
stack.append(cur_level)
cur_level = new_level
f_out.write(line)
elif command in ("else", "elif"):
if len(cur_level) == 0 or cur_level[-1][0] == 'else':
raise Problem("Unexpected #%s on %d"% (command,lineno))
if (len(cur_level) == 1 and command == 'else' and
lineno > cur_level[0][2] + LINE_OBVIOUSNESS_LIMIT):
f_out.write("#else /* !(%s) */\n"%cur_level[0][1])
else:
f_out.write(line)
cur_level.append((command, rest, lineno))
else:
assert command == 'endif'
if len(stack) == 0:
raise Problem("Unmatched #%s on %s"% (command,lineno))
if lineno <= cur_level[0][2] + LINE_OBVIOUSNESS_LIMIT:
f_out.write(line)
elif len(cur_level) == 1 or (
len(cur_level) == 2 and cur_level[1][0] == 'else'):
f_out.write("#endif /* %s */\n"%cur_level[0][1])
else:
f_out.write("#endif /* %s || ... */\n"%cur_level[0][1])
cur_level = stack.pop()
if len(stack) or cur_level != whole_file:
raise Problem("Missing #endif")
import sys,os
for fn in sys.argv[1:]:
with open(fn+"_OUT", 'w') as output_file:
translate(open(fn, 'r'), output_file)
os.rename(fn+"_OUT", fn)
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