1993-04-01 20:46:40 +00:00
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#! /usr/local/bin/python
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1992-01-01 18:38:21 +00:00
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1992-01-01 19:22:25 +00:00
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# Fix Python source files to use the new equality test operator, i.e.,
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1992-01-01 18:38:21 +00:00
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# if x = y: ...
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1992-01-01 19:22:25 +00:00
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# is changed to
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# if x == y: ...
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# The script correctly tokenizes the Python program to reliably
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# distinguish between assignments and equality tests.
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1992-01-01 18:38:21 +00:00
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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 python module.
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# Symbolic links are always ignored (except as explicit directory
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# arguments). Of course, the original file is kept as a back-up
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# (with a "~" attached to its name).
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1992-03-02 16:18:31 +00:00
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# It complains about binaries (files containing null bytes)
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# and about files that are ostensibly not Python files: if the first
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# line starts with '#!' and does not contain the string 'python'.
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1992-01-01 18:38:21 +00:00
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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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# Undoubtedly you can do this using find and sed or perl, but this is
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# a nice example of Python code that recurses down a directory tree
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# and uses regular expressions. Also note several subtleties like
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# preserving the file's mode and avoiding to even write a temp file
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# when no changes are needed for a file.
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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 a different change to Python programs...
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import sys
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import regex
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1992-03-30 11:12:23 +00:00
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import os
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1992-01-01 18:38:21 +00:00
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from stat import *
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1992-03-02 16:18:31 +00:00
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import string
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1992-01-01 18:38:21 +00:00
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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 main():
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bad = 0
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if not sys.argv[1:]: # No arguments
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1993-04-01 20:46:40 +00:00
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err('usage: ' + sys.argv[0] + ' file-or-directory ...\n')
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1992-01-01 18:38:21 +00:00
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sys.exit(2)
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for arg in sys.argv[1:]:
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1992-03-30 11:12:23 +00:00
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if os.path.isdir(arg):
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1992-01-01 18:38:21 +00:00
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if recursedown(arg): bad = 1
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1992-03-30 11:12:23 +00:00
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elif os.path.islink(arg):
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1992-01-01 18:38:21 +00:00
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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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ispythonprog = regex.compile('^[a-zA-Z0-9_]+\.py$')
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def ispython(name):
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return ispythonprog.match(name) >= 0
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def recursedown(dirname):
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dbg('recursedown(' + `dirname` + ')\n')
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bad = 0
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try:
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1992-03-30 11:12:23 +00:00
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names = os.listdir(dirname)
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except os.error, msg:
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1992-01-01 18:38:21 +00:00
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err(dirname + ': cannot list directory: ' + `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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1992-03-30 11:12:23 +00:00
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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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1992-01-01 18:38:21 +00:00
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subdirs.append(fullname)
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elif ispython(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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1992-01-01 19:22:25 +00:00
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## dbg('fix(' + `filename` + ')\n')
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1992-01-01 18:38:21 +00:00
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try:
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f = open(filename, 'r')
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except IOError, msg:
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err(filename + ': cannot open: ' + `msg` + '\n')
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return 1
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1992-03-30 11:12:23 +00:00
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head, tail = os.path.split(filename)
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tempname = os.path.join(head, '@' + tail)
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1992-01-01 18:38:21 +00:00
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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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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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1992-03-02 16:18:31 +00:00
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if g is None and '\0' in line:
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# Check for binary files
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err(filename + ': contains null bytes; not fixed\n')
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f.close()
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return 1
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if lineno == 1 and g is None and line[:2] == '#!':
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# Check for non-Python scripts
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words = string.split(line[2:])
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if words and regex.search('[pP]ython', words[0]) < 0:
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msg = filename + ': ' + words[0]
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msg = msg + ' script; not fixed\n'
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err(msg)
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f.close()
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return 1
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1992-01-01 18:38:21 +00:00
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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, msg:
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f.close()
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err(tempname+': cannot create: '+\
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`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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rep(filename + ':\n')
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continue # restart from the beginning
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rep(`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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f.close()
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if not g: return 0 # No changes
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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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1992-03-30 11:12:23 +00:00
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statbuf = os.stat(filename)
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os.chmod(tempname, statbuf[ST_MODE] & 07777)
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except os.error, msg:
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1992-01-01 18:38:21 +00:00
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err(tempname + ': warning: chmod failed (' + `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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1992-03-30 11:12:23 +00:00
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os.rename(filename, filename + '~')
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except os.error, msg:
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1992-01-01 18:38:21 +00:00
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err(filename + ': warning: backup failed (' + `msg` + ')\n')
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# Now move the temp file to the original file
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try:
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1992-03-30 11:12:23 +00:00
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os.rename(tempname, filename)
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except os.error, msg:
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1992-01-01 18:38:21 +00:00
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err(filename + ': rename failed (' + `msg` + ')\n')
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return 1
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# Return succes
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return 0
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1992-01-01 19:22:25 +00:00
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from tokenize import tokenprog
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match = {'if':':', 'elif':':', 'while':':', 'return':'\n', \
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'(':')', '[':']', '{':'}', '`':'`'}
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1992-01-01 18:38:21 +00:00
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def fixline(line):
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1992-01-01 19:22:25 +00:00
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# Quick check for easy case
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if '=' not in line: return line
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i, n = 0, len(line)
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stack = []
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while i < n:
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j = tokenprog.match(line, i)
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if j < 0:
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# A bad token; forget about the rest of this line
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print '(Syntax error:)'
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print line,
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return line
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a, b = tokenprog.regs[3] # Location of the token proper
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token = line[a:b]
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i = i+j
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if stack and token == stack[-1]:
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del stack[-1]
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elif match.has_key(token):
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stack.append(match[token])
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elif token == '=' and stack:
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line = line[:a] + '==' + line[b:]
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i, n = a + len('=='), len(line)
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elif token == '==' and not stack:
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print '(Warning: \'==\' at top level:)'
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print line,
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1992-01-01 18:38:21 +00:00
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return line
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1992-01-01 19:22:25 +00:00
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1992-01-01 18:38:21 +00:00
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main()
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