Tools/scripts/fixcid.py

   1 #! /usr/bin/env python
   2
   3 # Perform massive identifier substitution on C source files.
   4 # This actually tokenizes the files (to some extent) so it can
   5 # avoid making substitutions inside strings or comments.
   6 # Inside strings, substitutions are never made; inside comments,
   7 # it is a user option (off by default).
   8 #
   9 # The substitutions are read from one or more files whose lines,
  10 # when not empty, after stripping comments starting with #,
  11 # must contain exactly two words separated by whitespace: the
  12 # old identifier and its replacement.
  13 #
  14 # The option -r reverses the sense of the substitutions (this may be
  15 # useful to undo a particular substitution).
  16 #
  17 # If the old identifier is prefixed with a '*' (with no intervening
  18 # whitespace), then it will not be substituted inside comments.
  19 #
  20 # Command line arguments are files or directories to be processed.
  21 # Directories are searched recursively for files whose name looks
  22 # like a C file (ends in .h or .c).  The special filename '-' means
  23 # operate in filter mode: read stdin, write stdout.
  24 #
  25 # Symbolic links are always ignored (except as explicit directory
  26 # arguments).
  27 #
  28 # The original files are kept as back-up with a "~" suffix.
  29 #
  30 # Changes made are reported to stdout in a diff-like format.
  31 #
  32 # NB: by changing only the function fixline() you can turn this
  33 # into a program for different changes to C source files; by
  34 # changing the function wanted() you can make a different selection of
  35 # files.
  36
  37 import sys
  38 import re
  39 import os
  40 from stat import *
  41 import getopt
  42
  43 err = sys.stderr.write
  44 dbg = err
  45 rep = sys.stdout.write
  46
  47 def usage():
  48     progname = sys.argv[0]
  49     err('Usage: ' + progname +
  50               ' [-c] [-r] [-s file] ... file-or-directory ...\n')
  51     err('\n')
  52     err('-c           : substitute inside comments\n')
  53     err('-r           : reverse direction for following -s options\n')
  54     err('-s substfile : add a file of substitutions\n')
  55     err('\n')
  56     err('Each non-empty non-comment line in a substitution file must\n')
  57     err('contain exactly two words: an identifier and its replacement.\n')
  58     err('Comments start with a # character and end at end of line.\n')
  59     err('If an identifier is preceded with a *, it is not substituted\n')
  60     err('inside a comment even when -c is specified.\n')
  61
  62 def main():
  63     try:
  64         opts, args = getopt.getopt(sys.argv[1:], 'crs:')
  65     except getopt.error, msg:
  66         err('Options error: ' + str(msg) + '\n')
  67         usage()
  68         sys.exit(2)
  69     bad = 0
  70     if not args: # No arguments
  71         usage()
  72         sys.exit(2)
  73     for opt, arg in opts:
  74         if opt == '-c':
  75             setdocomments()
  76         if opt == '-r':
  77             setreverse()
  78         if opt == '-s':
  79             addsubst(arg)
  80     for arg in args:
  81         if os.path.isdir(arg):
  82             if recursedown(arg): bad = 1
  83         elif os.path.islink(arg):
  84             err(arg + ': will not process symbolic links\n')
  85             bad = 1
  86         else:
  87             if fix(arg): bad = 1
  88     sys.exit(bad)
  89
  90 # Change this regular expression to select a different set of files
  91 Wanted = '^[a-zA-Z0-9_]+\.[ch]$'
  92 def wanted(name):
  93     return re.match(Wanted, name) >= 0
  94
  95 def recursedown(dirname):
  96     dbg('recursedown(%r)\n' % (dirname,))
  97     bad = 0
  98     try:
  99         names = os.listdir(dirname)
 100     except os.error, msg:
 101         err(dirname + ': cannot list directory: ' + str(msg) + '\n')
 102         return 1
 103     names.sort()
 104     subdirs = []
 105     for name in names:
 106         if name in (os.curdir, os.pardir): continue
 107         fullname = os.path.join(dirname, name)
 108         if os.path.islink(fullname): pass
 109         elif os.path.isdir(fullname):
 110             subdirs.append(fullname)
 111         elif wanted(name):
 112             if fix(fullname): bad = 1
 113     for fullname in subdirs:
 114         if recursedown(fullname): bad = 1
 115     return bad
 116
 117 def fix(filename):
 118 ##  dbg('fix(%r)\n' % (filename,))
 119     if filename == '-':
 120         # Filter mode
 121         f = sys.stdin
 122         g = sys.stdout
 123     else:
 124         # File replacement mode
 125         try:
 126             f = open(filename, 'r')
 127         except IOError, msg:
 128             err(filename + ': cannot open: ' + str(msg) + '\n')
 129             return 1
 130         head, tail = os.path.split(filename)
 131         tempname = os.path.join(head, '@' + tail)
 132         g = None
 133     # If we find a match, we rewind the file and start over but
 134     # now copy everything to a temp file.
 135     lineno = 0
 136     initfixline()
 137     while 1:
 138         line = f.readline()
 139         if not line: break
 140         lineno = lineno + 1
 141         while line[-2:] == '\\\n':
 142             nextline = f.readline()
 143             if not nextline: break
 144             line = line + nextline
 145             lineno = lineno + 1
 146         newline = fixline(line)
 147         if newline != line:
 148             if g is None:
 149                 try:
 150                     g = open(tempname, 'w')
 151                 except IOError, msg:
 152                     f.close()
 153                     err(tempname+': cannot create: '+
 154                         str(msg)+'\n')
 155                     return 1
 156                 f.seek(0)
 157                 lineno = 0
 158                 initfixline()
 159                 rep(filename + ':\n')
 160                 continue # restart from the beginning
 161             rep(repr(lineno) + '\n')
 162             rep('< ' + line)
 163             rep('> ' + newline)
 164         if g is not None:
 165             g.write(newline)
 166
 167     # End of file
 168     if filename == '-': return 0 # Done in filter mode
 169     f.close()
 170     if not g: return 0 # No changes
 171
 172     # Finishing touch -- move files
 173
 174     # First copy the file's mode to the temp file
 175     try:
 176         statbuf = os.stat(filename)
 177         os.chmod(tempname, statbuf[ST_MODE] & 07777)
 178     except os.error, msg:
 179         err(tempname + ': warning: chmod failed (' + str(msg) + ')\n')
 180     # Then make a backup of the original file as filename~
 181     try:
 182         os.rename(filename, filename + '~')
 183     except os.error, msg:
 184         err(filename + ': warning: backup failed (' + str(msg) + ')\n')
 185     # Now move the temp file to the original file
 186     try:
 187         os.rename(tempname, filename)
 188     except os.error, msg:
 189         err(filename + ': rename failed (' + str(msg) + ')\n')
 190         return 1
 191     # Return succes
 192     return 0
 193
 194 # Tokenizing ANSI C (partly)
 195
 196 Identifier = '\(struct \)?[a-zA-Z_][a-zA-Z0-9_]+'
 197 String = '"\([^\n\\"]\|\\\\.\)*"'
 198 Char = '\'\([^\n\\\']\|\\\\.\)*\''
 199 CommentStart = '/\*'
 200 CommentEnd = '\*/'
 201
 202 Hexnumber = '0[xX][0-9a-fA-F]*[uUlL]*'
 203 Octnumber = '0[0-7]*[uUlL]*'
 204 Decnumber = '[1-9][0-9]*[uUlL]*'
 205 Intnumber = Hexnumber + '\|' + Octnumber + '\|' + Decnumber
 206 Exponent = '[eE][-+]?[0-9]+'
 207 Pointfloat = '\([0-9]+\.[0-9]*\|\.[0-9]+\)\(' + Exponent + '\)?'
 208 Expfloat = '[0-9]+' + Exponent
 209 Floatnumber = Pointfloat + '\|' + Expfloat
 210 Number = Floatnumber + '\|' + Intnumber
 211
 212 # Anything else is an operator -- don't list this explicitly because of '/*'
 213
 214 OutsideComment = (Identifier, Number, String, Char, CommentStart)
 215 OutsideCommentPattern = '(' + '|'.join(OutsideComment) + ')'
 216 OutsideCommentProgram = re.compile(OutsideCommentPattern)
 217
 218 InsideComment = (Identifier, Number, CommentEnd)
 219 InsideCommentPattern = '(' + '|'.join(InsideComment) + ')'
 220 InsideCommentProgram = re.compile(InsideCommentPattern)
 221
 222 def initfixline():
 223     global Program
 224     Program = OutsideCommentProgram
 225
 226 def fixline(line):
 227     global Program
 228 ##  print '-->', repr(line)
 229     i = 0
 230     while i < len(line):
 231         i = Program.search(line, i)
 232         if i < 0: break
 233         found = Program.group(0)
 234 ##      if Program is InsideCommentProgram: print '...',
 235 ##      else: print '   ',
 236 ##      print found
 237         if len(found) == 2:
 238             if found == '/*':
 239                 Program = InsideCommentProgram
 240             elif found == '*/':
 241                 Program = OutsideCommentProgram
 242         n = len(found)
 243         if Dict.has_key(found):
 244             subst = Dict[found]
 245             if Program is InsideCommentProgram:
 246                 if not Docomments:
 247                     print 'Found in comment:', found
 248                     i = i + n
 249                     continue
 250                 if NotInComment.has_key(found):
 251 ##                  print 'Ignored in comment:',
 252 ##                  print found, '-->', subst
 253 ##                  print 'Line:', line,
 254                     subst = found
 255 ##              else:
 256 ##                  print 'Substituting in comment:',
 257 ##                  print found, '-->', subst
 258 ##                  print 'Line:', line,
 259             line = line[:i] + subst + line[i+n:]
 260             n = len(subst)
 261         i = i + n
 262     return line
 263
 264 Docomments = 0
 265 def setdocomments():
 266     global Docomments
 267     Docomments = 1
 268
 269 Reverse = 0
 270 def setreverse():
 271     global Reverse
 272     Reverse = (not Reverse)
 273
 274 Dict = {}
 275 NotInComment = {}
 276 def addsubst(substfile):
 277     try:
 278         fp = open(substfile, 'r')
 279     except IOError, msg:
 280         err(substfile + ': cannot read substfile: ' + str(msg) + '\n')
 281         sys.exit(1)
 282     lineno = 0
 283     while 1:
 284         line = fp.readline()
 285         if not line: break
 286         lineno = lineno + 1
 287         try:
 288             i = line.index('#')
 289         except ValueError:
 290             i = -1          # Happens to delete trailing \n
 291         words = line[:i].split()
 292         if not words: continue
 293         if len(words) == 3 and words[0] == 'struct':
 294             words[:2] = [words[0] + ' ' + words[1]]
 295         elif len(words) <> 2:
 296             err(substfile + '%s:%r: warning: bad line: %r' % (substfile, lineno, line))
 297             continue
 298         if Reverse:
 299             [value, key] = words
 300         else:
 301             [key, value] = words
 302         if value[0] == '*':
 303             value = value[1:]
 304         if key[0] == '*':
 305             key = key[1:]
 306             NotInComment[key] = value
 307         if Dict.has_key(key):
 308             err('%s:%r: warning: overriding: %r %r\n' % (substfile, lineno, key, value))
 309             err('%s:%r: warning: previous: %r\n' % (substfile, lineno, Dict[key]))
 310         Dict[key] = value
 311     fp.close()
 312
 313 if __name__ == '__main__':
 314     main()