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@@ -0,0 +1,74 @@
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+#!/usr/bin/python
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+# Copyright (c) 2017, The Tor Project, Inc.
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+# See LICENSE for licensing information
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+
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+import re
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+
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+LINE_OBVIOUSNESS_LIMIT = 4
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+
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+class Problem(Exception):
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+ pass
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+
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+def uncomment(s):
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+ s = re.sub(r'//.*','',s)
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+ s = re.sub(r'/\*.*','',s)
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+ return s.strip()
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+
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+def translate(f_in, f_out):
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+ whole_file = []
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+ stack = []
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+ cur_level = whole_file
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+ lineno = 0
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+ for line in f_in:
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+ lineno += 1
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+ m = re.match(r'\s*#\s*(if|ifdef|ifndef|else|endif|elif)\b\s*(.*)',
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+ line)
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+ if not m:
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+ f_out.write(line)
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+ continue
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+ command,rest = m.groups()
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+ if command in ("if", "ifdef", "ifndef"):
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+ # The #if directive pushes us one level lower on the stack.
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+ if command == 'ifdef':
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+ rest = "defined(%s)"%uncomment(rest)
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+ elif command == 'ifndef':
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+ rest = "!defined(%s)"%uncomment(rest)
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+ elif rest.endswith("\\"):
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+ rest = rest[:-1]+"..."
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+
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+ rest = uncomment(rest)
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+
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+ new_level = [ (command, rest, lineno) ]
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+ stack.append(cur_level)
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+ cur_level = new_level
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+ f_out.write(line)
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+ elif command in ("else", "elif"):
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+ if len(cur_level) == 0 or cur_level[-1][0] == 'else':
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+ raise Problem("Unexpected #%s on %d"% (command,lineno))
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+ if (len(cur_level) == 1 and command == 'else' and
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+ lineno > cur_level[0][2] + LINE_OBVIOUSNESS_LIMIT):
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+ f_out.write("#else // !(%s)\n"%cur_level[0][1])
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+ else:
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+ f_out.write(line)
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+ cur_level.append((command, rest, lineno))
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+ else:
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+ assert command == 'endif'
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+ if len(stack) == 0:
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+ raise Problem("Unmatched #%s on %s"% (command,lineno))
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+ if lineno <= cur_level[0][2] + LINE_OBVIOUSNESS_LIMIT:
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+ f_out.write(line)
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+ elif len(cur_level) == 1 or (
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+ len(cur_level) == 2 and cur_level[1][0] == 'else'):
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+ f_out.write("#endif // %s\n"%cur_level[0][1])
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+ else:
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+ f_out.write("#endif // %s || ...\n"%cur_level[0][1])
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+ cur_level = stack.pop()
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+ if len(stack) or cur_level != whole_file:
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+ raise Problem("Missing #endif")
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+
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+import sys,os
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+for fn in sys.argv[1:]:
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+ with open(fn+"_OUT", 'w') as output_file:
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+ translate(open(fn, 'r'), output_file)
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+ os.rename(fn+"_OUT", fn)
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+
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