mirror of
https://github.com/python/cpython.git
synced 2025-11-03 23:21:29 +00:00
276 lines
8.4 KiB
Python
276 lines
8.4 KiB
Python
#! /usr/bin/env python
|
|
|
|
"""cleanfuture [-d][-r][-v] path ...
|
|
|
|
-d Dry run. Analyze, but don't make any changes to, files.
|
|
-r Recurse. Search for all .py files in subdirectories too.
|
|
-v Verbose. Print informative msgs.
|
|
|
|
Search Python (.py) files for future statements, and remove the features
|
|
from such statements that are already mandatory in the version of Python
|
|
you're using.
|
|
|
|
Pass one or more file and/or directory paths. When a directory path, all
|
|
.py files within the directory will be examined, and, if the -r option is
|
|
given, likewise recursively for subdirectories.
|
|
|
|
Overwrites files in place, renaming the originals with a .bak extension. If
|
|
cleanfuture finds nothing to change, the file is left alone. If cleanfuture
|
|
does change a file, the changed file is a fixed-point (i.e., running
|
|
cleanfuture on the resulting .py file won't change it again, at least not
|
|
until you try it again with a later Python release).
|
|
|
|
Limitations: You can do these things, but this tool won't help you then:
|
|
|
|
+ A future statement cannot be mixed with any other statement on the same
|
|
physical line (separated by semicolon).
|
|
|
|
+ A future statement cannot contain an "as" clause.
|
|
|
|
Example: Assuming you're using Python 2.2, if a file containing
|
|
|
|
from __future__ import nested_scopes, generators
|
|
|
|
is analyzed by cleanfuture, the line is rewritten to
|
|
|
|
from __future__ import generators
|
|
|
|
because nested_scopes is no longer optional in 2.2 but generators is.
|
|
"""
|
|
|
|
import __future__
|
|
import tokenize
|
|
import os
|
|
import sys
|
|
|
|
dryrun = 0
|
|
recurse = 0
|
|
verbose = 0
|
|
|
|
def errprint(*args):
|
|
strings = map(str, args)
|
|
msg = ' '.join(strings)
|
|
if msg[-1:] != '\n':
|
|
msg += '\n'
|
|
sys.stderr.write(msg)
|
|
|
|
def main():
|
|
import getopt
|
|
global verbose, recurse, dryrun
|
|
try:
|
|
opts, args = getopt.getopt(sys.argv[1:], "drv")
|
|
except getopt.error as msg:
|
|
errprint(msg)
|
|
return
|
|
for o, a in opts:
|
|
if o == '-d':
|
|
dryrun += 1
|
|
elif o == '-r':
|
|
recurse += 1
|
|
elif o == '-v':
|
|
verbose += 1
|
|
if not args:
|
|
errprint("Usage:", __doc__)
|
|
return
|
|
for arg in args:
|
|
check(arg)
|
|
|
|
def check(file):
|
|
if os.path.isdir(file) and not os.path.islink(file):
|
|
if verbose:
|
|
print("listing directory", file)
|
|
names = os.listdir(file)
|
|
for name in names:
|
|
fullname = os.path.join(file, name)
|
|
if ((recurse and os.path.isdir(fullname) and
|
|
not os.path.islink(fullname))
|
|
or name.lower().endswith(".py")):
|
|
check(fullname)
|
|
return
|
|
|
|
if verbose:
|
|
print("checking", file, "...", end=' ')
|
|
try:
|
|
f = open(file)
|
|
except IOError as msg:
|
|
errprint("%r: I/O Error: %s" % (file, str(msg)))
|
|
return
|
|
|
|
ff = FutureFinder(f, file)
|
|
changed = ff.run()
|
|
if changed:
|
|
ff.gettherest()
|
|
f.close()
|
|
if changed:
|
|
if verbose:
|
|
print("changed.")
|
|
if dryrun:
|
|
print("But this is a dry run, so leaving it alone.")
|
|
for s, e, line in changed:
|
|
print("%r lines %d-%d" % (file, s+1, e+1))
|
|
for i in range(s, e+1):
|
|
print(ff.lines[i], end=' ')
|
|
if line is None:
|
|
print("-- deleted")
|
|
else:
|
|
print("-- change to:")
|
|
print(line, end=' ')
|
|
if not dryrun:
|
|
bak = file + ".bak"
|
|
if os.path.exists(bak):
|
|
os.remove(bak)
|
|
os.rename(file, bak)
|
|
if verbose:
|
|
print("renamed", file, "to", bak)
|
|
g = open(file, "w")
|
|
ff.write(g)
|
|
g.close()
|
|
if verbose:
|
|
print("wrote new", file)
|
|
else:
|
|
if verbose:
|
|
print("unchanged.")
|
|
|
|
class FutureFinder:
|
|
|
|
def __init__(self, f, fname):
|
|
self.f = f
|
|
self.fname = fname
|
|
self.ateof = 0
|
|
self.lines = [] # raw file lines
|
|
|
|
# List of (start_index, end_index, new_line) triples.
|
|
self.changed = []
|
|
|
|
# Line-getter for tokenize.
|
|
def getline(self):
|
|
if self.ateof:
|
|
return ""
|
|
line = self.f.readline()
|
|
if line == "":
|
|
self.ateof = 1
|
|
else:
|
|
self.lines.append(line)
|
|
return line
|
|
|
|
def run(self):
|
|
STRING = tokenize.STRING
|
|
NL = tokenize.NL
|
|
NEWLINE = tokenize.NEWLINE
|
|
COMMENT = tokenize.COMMENT
|
|
NAME = tokenize.NAME
|
|
OP = tokenize.OP
|
|
|
|
changed = self.changed
|
|
get = tokenize.generate_tokens(self.getline).__next__
|
|
type, token, (srow, scol), (erow, ecol), line = get()
|
|
|
|
# Chew up initial comments and blank lines (if any).
|
|
while type in (COMMENT, NL, NEWLINE):
|
|
type, token, (srow, scol), (erow, ecol), line = get()
|
|
|
|
# Chew up docstring (if any -- and it may be implicitly catenated!).
|
|
while type is STRING:
|
|
type, token, (srow, scol), (erow, ecol), line = get()
|
|
|
|
# Analyze the future stmts.
|
|
while 1:
|
|
# Chew up comments and blank lines (if any).
|
|
while type in (COMMENT, NL, NEWLINE):
|
|
type, token, (srow, scol), (erow, ecol), line = get()
|
|
|
|
if not (type is NAME and token == "from"):
|
|
break
|
|
startline = srow - 1 # tokenize is one-based
|
|
type, token, (srow, scol), (erow, ecol), line = get()
|
|
|
|
if not (type is NAME and token == "__future__"):
|
|
break
|
|
type, token, (srow, scol), (erow, ecol), line = get()
|
|
|
|
if not (type is NAME and token == "import"):
|
|
break
|
|
type, token, (srow, scol), (erow, ecol), line = get()
|
|
|
|
# Get the list of features.
|
|
features = []
|
|
while type is NAME:
|
|
features.append(token)
|
|
type, token, (srow, scol), (erow, ecol), line = get()
|
|
|
|
if not (type is OP and token == ','):
|
|
break
|
|
type, token, (srow, scol), (erow, ecol), line = get()
|
|
|
|
# A trailing comment?
|
|
comment = None
|
|
if type is COMMENT:
|
|
comment = token
|
|
type, token, (srow, scol), (erow, ecol), line = get()
|
|
|
|
if type is not NEWLINE:
|
|
errprint("Skipping file %r; can't parse line %d:\n%s" %
|
|
(self.fname, srow, line))
|
|
return []
|
|
|
|
endline = srow - 1
|
|
|
|
# Check for obsolete features.
|
|
okfeatures = []
|
|
for f in features:
|
|
object = getattr(__future__, f, None)
|
|
if object is None:
|
|
# A feature we don't know about yet -- leave it in.
|
|
# They'll get a compile-time error when they compile
|
|
# this program, but that's not our job to sort out.
|
|
okfeatures.append(f)
|
|
else:
|
|
released = object.getMandatoryRelease()
|
|
if released is None or released <= sys.version_info:
|
|
# Withdrawn or obsolete.
|
|
pass
|
|
else:
|
|
okfeatures.append(f)
|
|
|
|
# Rewrite the line if at least one future-feature is obsolete.
|
|
if len(okfeatures) < len(features):
|
|
if len(okfeatures) == 0:
|
|
line = None
|
|
else:
|
|
line = "from __future__ import "
|
|
line += ', '.join(okfeatures)
|
|
if comment is not None:
|
|
line += ' ' + comment
|
|
line += '\n'
|
|
changed.append((startline, endline, line))
|
|
|
|
# Loop back for more future statements.
|
|
|
|
return changed
|
|
|
|
def gettherest(self):
|
|
if self.ateof:
|
|
self.therest = ''
|
|
else:
|
|
self.therest = self.f.read()
|
|
|
|
def write(self, f):
|
|
changed = self.changed
|
|
assert changed
|
|
# Prevent calling this again.
|
|
self.changed = []
|
|
# Apply changes in reverse order.
|
|
changed.reverse()
|
|
for s, e, line in changed:
|
|
if line is None:
|
|
# pure deletion
|
|
del self.lines[s:e+1]
|
|
else:
|
|
self.lines[s:e+1] = [line]
|
|
f.writelines(self.lines)
|
|
# Copy over the remainder of the file.
|
|
if self.therest:
|
|
f.write(self.therest)
|
|
|
|
if __name__ == '__main__':
|
|
main()
|