cpython/Tools/scripts/classfix.py at 2.7 · python-emscripten/cpython · GitHub

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#! /usr/bin/env python

# This script is obsolete -- it is kept for historical purposes only.

# Fix Python source files to use the new class definition syntax, i.e.,

# the syntax used in Python versions before 0.9.8:

# class C() = base(), base(), ...: ...

# is changed to the current syntax:

# class C(base, base, ...): ...

# The script uses heuristics to find class definitions that usually

# work but occasionally can fail; carefully check the output!

# Command line arguments are files or directories to be processed.

# Directories are searched recursively for files whose name looks

# like a python module.

# Symbolic links are always ignored (except as explicit directory

# arguments). Of course, the original file is kept as a back-up

# (with a "~" attached to its name).

# Changes made are reported to stdout in a diff-like format.

# Undoubtedly you can do this using find and sed or perl, but this is

# a nice example of Python code that recurses down a directory tree

# and uses regular expressions. Also note several subtleties like

# preserving the file's mode and avoiding to even write a temp file

# when no changes are needed for a file.

# NB: by changing only the function fixline() you can turn this

# into a program for a different change to Python programs...

import sys

import re

import os

from stat import *

err = sys.stderr.write

dbg = err

rep = sys.stdout.write

def main():

bad = 0

if not sys.argv[1:]: # No arguments

err('usage: ' + sys.argv[0] + ' file-or-directory ...\n')

sys.exit(2)

for arg in sys.argv[1:]:

if os.path.isdir(arg):

if recursedown(arg): bad = 1

elif os.path.islink(arg):

err(arg + ': will not process symbolic links\n')

bad = 1

else:

if fix(arg): bad = 1

sys.exit(bad)

ispythonprog = re.compile('^[a-zA-Z0-9_]+\.py$')

def ispython(name):

return ispythonprog.match(name) >= 0

def recursedown(dirname):

dbg('recursedown(%r)\n' % (dirname,))

bad = 0

try:

names = os.listdir(dirname)

except os.error, msg:

err('%s: cannot list directory: %r\n' % (dirname, msg))

return 1

names.sort()

subdirs = []

for name in names:

if name in (os.curdir, os.pardir): continue

fullname = os.path.join(dirname, name)

if os.path.islink(fullname): pass

elif os.path.isdir(fullname):

subdirs.append(fullname)

elif ispython(name):

if fix(fullname): bad = 1

for fullname in subdirs:

if recursedown(fullname): bad = 1

return bad

def fix(filename):

## dbg('fix(%r)\n' % (filename,))

try:

f = open(filename, 'r')

except IOError, msg:

err('%s: cannot open: %r\n' % (filename, msg))

return 1

head, tail = os.path.split(filename)

tempname = os.path.join(head, '@' + tail)

g = None

# If we find a match, we rewind the file and start over but

# now copy everything to a temp file.

lineno = 0

while 1:

line = f.readline()

if not line: break

lineno = lineno + 1

while line[-2:] == '\\\n':

nextline = f.readline()

if not nextline: break

line = line + nextline

lineno = lineno + 1

newline = fixline(line)

if newline != line:

if g is None:

try:

g = open(tempname, 'w')

except IOError, msg:

f.close()

err('%s: cannot create: %r\n' % (tempname, msg))

return 1

f.seek(0)

lineno = 0

rep(filename + ':\n')

continue # restart from the beginning

rep(repr(lineno) + '\n')

rep('< ' + line)

rep('> ' + newline)

if g is not None:

g.write(newline)

# End of file

f.close()

if not g: return 0 # No changes

# Finishing touch -- move files

# First copy the file's mode to the temp file

try:

statbuf = os.stat(filename)

os.chmod(tempname, statbuf[ST_MODE] & 07777)

except os.error, msg:

err('%s: warning: chmod failed (%r)\n' % (tempname, msg))

# Then make a backup of the original file as filename~

try:

os.rename(filename, filename + '~')

except os.error, msg:

err('%s: warning: backup failed (%r)\n' % (filename, msg))

# Now move the temp file to the original file

try:

os.rename(tempname, filename)

except os.error, msg:

err('%s: rename failed (%r)\n' % (filename, msg))

return 1

# Return succes

return 0

# This expression doesn't catch *all* class definition headers,

# but it's pretty darn close.

classexpr = '^([ \t]*class +[a-zA-Z0-9_]+) *( *) *((=.*)?):'

classprog = re.compile(classexpr)

# Expressions for finding base class expressions.

baseexpr = '^ *(.*) *( *) *$'

baseprog = re.compile(baseexpr)

def fixline(line):

if classprog.match(line) < 0: # No 'class' keyword -- no change

return line

(a0, b0), (a1, b1), (a2, b2) = classprog.regs[:3]

# a0, b0 = Whole match (up to ':')

# a1, b1 = First subexpression (up to classname)

# a2, b2 = Second subexpression (=.*)

head = line[:b1]

tail = line[b0:] # Unmatched rest of line

if a2 == b2: # No base classes -- easy case

return head + ':' + tail

# Get rid of leading '='

basepart = line[a2+1:b2]

# Extract list of base expressions

bases = basepart.split(',')

# Strip trailing '()' from each base expression

for i in range(len(bases)):

if baseprog.match(bases[i]) >= 0:

x1, y1 = baseprog.regs[1]

bases[i] = bases[i][x1:y1]

# Join the bases back again and build the new line

basepart = ', '.join(bases)

return head + '(' + basepart + '):' + tail

if __name__ == '__main__':

main()

cpython/Tools/scripts/classfix.py at 2.7 · python-emscripten/cpython · GitHub

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