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317 lines
10 KiB
317 lines
10 KiB
#! /usr/bin/env python3
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# Perform massive identifier substitution on C source files.
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# This actually tokenizes the files (to some extent) so it can
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# avoid making substitutions inside strings or comments.
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# Inside strings, substitutions are never made; inside comments,
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# it is a user option (off by default).
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#
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# The substitutions are read from one or more files whose lines,
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# when not empty, after stripping comments starting with #,
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# must contain exactly two words separated by whitespace: the
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# old identifier and its replacement.
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#
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# The option -r reverses the sense of the substitutions (this may be
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# useful to undo a particular substitution).
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#
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# If the old identifier is prefixed with a '*' (with no intervening
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# whitespace), then it will not be substituted inside comments.
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#
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# Command line arguments are files or directories to be processed.
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# Directories are searched recursively for files whose name looks
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# like a C file (ends in .h or .c). The special filename '-' means
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# operate in filter mode: read stdin, write stdout.
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#
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# Symbolic links are always ignored (except as explicit directory
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# arguments).
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#
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# The original files are kept as back-up with a "~" suffix.
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#
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# Changes made are reported to stdout in a diff-like format.
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#
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# NB: by changing only the function fixline() you can turn this
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# into a program for different changes to C source files; by
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# changing the function wanted() you can make a different selection of
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# files.
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import sys
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import re
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import os
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from stat import *
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import getopt
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err = sys.stderr.write
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dbg = err
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rep = sys.stdout.write
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def usage():
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progname = sys.argv[0]
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err('Usage: ' + progname +
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' [-c] [-r] [-s file] ... file-or-directory ...\n')
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err('\n')
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err('-c : substitute inside comments\n')
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err('-r : reverse direction for following -s options\n')
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err('-s substfile : add a file of substitutions\n')
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err('\n')
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err('Each non-empty non-comment line in a substitution file must\n')
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err('contain exactly two words: an identifier and its replacement.\n')
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err('Comments start with a # character and end at end of line.\n')
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err('If an identifier is preceded with a *, it is not substituted\n')
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err('inside a comment even when -c is specified.\n')
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def main():
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try:
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opts, args = getopt.getopt(sys.argv[1:], 'crs:')
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except getopt.error as msg:
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err('Options error: ' + str(msg) + '\n')
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usage()
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sys.exit(2)
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bad = 0
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if not args: # No arguments
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usage()
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sys.exit(2)
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for opt, arg in opts:
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if opt == '-c':
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setdocomments()
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if opt == '-r':
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setreverse()
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if opt == '-s':
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addsubst(arg)
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for arg in args:
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if os.path.isdir(arg):
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if recursedown(arg): bad = 1
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elif os.path.islink(arg):
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err(arg + ': will not process symbolic links\n')
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bad = 1
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else:
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if fix(arg): bad = 1
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sys.exit(bad)
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# Change this regular expression to select a different set of files
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Wanted = r'^[a-zA-Z0-9_]+\.[ch]$'
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def wanted(name):
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return re.match(Wanted, name)
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def recursedown(dirname):
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dbg('recursedown(%r)\n' % (dirname,))
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bad = 0
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try:
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names = os.listdir(dirname)
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except OSError as msg:
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err(dirname + ': cannot list directory: ' + str(msg) + '\n')
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return 1
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names.sort()
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subdirs = []
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for name in names:
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if name in (os.curdir, os.pardir): continue
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fullname = os.path.join(dirname, name)
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if os.path.islink(fullname): pass
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elif os.path.isdir(fullname):
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subdirs.append(fullname)
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elif wanted(name):
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if fix(fullname): bad = 1
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for fullname in subdirs:
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if recursedown(fullname): bad = 1
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return bad
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def fix(filename):
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## dbg('fix(%r)\n' % (filename,))
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if filename == '-':
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# Filter mode
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f = sys.stdin
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g = sys.stdout
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else:
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# File replacement mode
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try:
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f = open(filename, 'r')
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except IOError as msg:
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err(filename + ': cannot open: ' + str(msg) + '\n')
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return 1
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head, tail = os.path.split(filename)
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tempname = os.path.join(head, '@' + tail)
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g = None
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# If we find a match, we rewind the file and start over but
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# now copy everything to a temp file.
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lineno = 0
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initfixline()
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while 1:
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line = f.readline()
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if not line: break
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lineno = lineno + 1
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while line[-2:] == '\\\n':
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nextline = f.readline()
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if not nextline: break
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line = line + nextline
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lineno = lineno + 1
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newline = fixline(line)
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if newline != line:
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if g is None:
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try:
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g = open(tempname, 'w')
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except IOError as msg:
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f.close()
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err(tempname+': cannot create: '+
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str(msg)+'\n')
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return 1
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f.seek(0)
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lineno = 0
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initfixline()
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rep(filename + ':\n')
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continue # restart from the beginning
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rep(repr(lineno) + '\n')
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rep('< ' + line)
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rep('> ' + newline)
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if g is not None:
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g.write(newline)
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# End of file
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if filename == '-': return 0 # Done in filter mode
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f.close()
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if not g: return 0 # No changes
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g.close()
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# Finishing touch -- move files
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# First copy the file's mode to the temp file
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try:
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statbuf = os.stat(filename)
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os.chmod(tempname, statbuf[ST_MODE] & 0o7777)
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except OSError as msg:
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err(tempname + ': warning: chmod failed (' + str(msg) + ')\n')
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# Then make a backup of the original file as filename~
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try:
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os.rename(filename, filename + '~')
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except OSError as msg:
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err(filename + ': warning: backup failed (' + str(msg) + ')\n')
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# Now move the temp file to the original file
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try:
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os.rename(tempname, filename)
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except OSError as msg:
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err(filename + ': rename failed (' + str(msg) + ')\n')
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return 1
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# Return success
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return 0
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# Tokenizing ANSI C (partly)
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Identifier = '(struct )?[a-zA-Z_][a-zA-Z0-9_]+'
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String = r'"([^\n\\"]|\\.)*"'
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Char = r"'([^\n\\']|\\.)*'"
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CommentStart = r'/\*'
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CommentEnd = r'\*/'
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Hexnumber = '0[xX][0-9a-fA-F]*[uUlL]*'
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Octnumber = '0[0-7]*[uUlL]*'
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Decnumber = '[1-9][0-9]*[uUlL]*'
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Intnumber = Hexnumber + '|' + Octnumber + '|' + Decnumber
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Exponent = '[eE][-+]?[0-9]+'
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Pointfloat = r'([0-9]+\.[0-9]*|\.[0-9]+)(' + Exponent + r')?'
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Expfloat = '[0-9]+' + Exponent
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Floatnumber = Pointfloat + '|' + Expfloat
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Number = Floatnumber + '|' + Intnumber
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# Anything else is an operator -- don't list this explicitly because of '/*'
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OutsideComment = (Identifier, Number, String, Char, CommentStart)
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OutsideCommentPattern = '(' + '|'.join(OutsideComment) + ')'
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OutsideCommentProgram = re.compile(OutsideCommentPattern)
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InsideComment = (Identifier, Number, CommentEnd)
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InsideCommentPattern = '(' + '|'.join(InsideComment) + ')'
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InsideCommentProgram = re.compile(InsideCommentPattern)
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def initfixline():
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global Program
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Program = OutsideCommentProgram
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def fixline(line):
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global Program
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## print('-->', repr(line))
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i = 0
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while i < len(line):
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match = Program.search(line, i)
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if match is None: break
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i = match.start()
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found = match.group(0)
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## if Program is InsideCommentProgram: print(end='... ')
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## else: print(end=' ')
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## print(found)
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if len(found) == 2:
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if found == '/*':
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Program = InsideCommentProgram
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elif found == '*/':
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Program = OutsideCommentProgram
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n = len(found)
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if found in Dict:
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subst = Dict[found]
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if Program is InsideCommentProgram:
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if not Docomments:
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print('Found in comment:', found)
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i = i + n
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continue
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if found in NotInComment:
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## print(end='Ignored in comment: ')
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## print(found, '-->', subst)
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## print('Line:', line, end='')
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subst = found
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## else:
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## print(end='Substituting in comment: ')
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## print(found, '-->', subst)
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## print('Line:', line, end='')
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line = line[:i] + subst + line[i+n:]
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n = len(subst)
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i = i + n
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return line
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Docomments = 0
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def setdocomments():
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global Docomments
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Docomments = 1
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Reverse = 0
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def setreverse():
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global Reverse
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Reverse = (not Reverse)
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Dict = {}
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NotInComment = {}
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def addsubst(substfile):
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try:
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fp = open(substfile, 'r')
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except IOError as msg:
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err(substfile + ': cannot read substfile: ' + str(msg) + '\n')
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sys.exit(1)
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lineno = 0
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while 1:
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line = fp.readline()
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if not line: break
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lineno = lineno + 1
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try:
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i = line.index('#')
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except ValueError:
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i = -1 # Happens to delete trailing \n
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words = line[:i].split()
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if not words: continue
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if len(words) == 3 and words[0] == 'struct':
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words[:2] = [words[0] + ' ' + words[1]]
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elif len(words) != 2:
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err(substfile + '%s:%r: warning: bad line: %r' % (substfile, lineno, line))
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continue
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if Reverse:
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[value, key] = words
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else:
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[key, value] = words
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if value[0] == '*':
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value = value[1:]
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if key[0] == '*':
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key = key[1:]
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NotInComment[key] = value
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if key in Dict:
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err('%s:%r: warning: overriding: %r %r\n' % (substfile, lineno, key, value))
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err('%s:%r: warning: previous: %r\n' % (substfile, lineno, Dict[key]))
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Dict[key] = value
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fp.close()
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if __name__ == '__main__':
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main()
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