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#! /usr/bin/env python3
# Released to the public domain, by Tim Peters, 28 February 2000.
"""checkappend.py -- search for multi-argument .append() calls.
Usage: specify one or more file or directory paths:
checkappend [-v] file_or_dir [file_or_dir] ...
Each file_or_dir is checked for multi-argument .append() calls. When
a directory, all .py files in the directory, and recursively in its
subdirectories, are checked.
Use -v for status msgs. Use -vv for more status msgs.
In the absence of -v, the only output is pairs of the form
filename(linenumber):
line containing the suspicious append
Note that this finds multi-argument append calls regardless of whether
they're attached to list objects. If a module defines a class with an
append method that takes more than one argument, calls to that method
will be listed.
Note that this will not find multi-argument list.append calls made via a
bound method object. For example, this is not caught:
somelist = []
push = somelist.append
push(1, 2, 3)
"""
__version__ = 1, 0, 0
import os
import sys
import getopt
import tokenize
verbose = 0
def errprint(*args):
msg = ' '.join(args)
sys.stderr.write(msg)
sys.stderr.write("\n")
def main():
args = sys.argv[1:]
global verbose
try:
opts, args = getopt.getopt(sys.argv[1:], "v")
except getopt.error as msg:
errprint(str(msg) + "\n\n" + __doc__)
return
for opt, optarg in opts:
if opt == '-v':
verbose = verbose + 1
if not args:
errprint(__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("%r: listing directory" % (file,))
names = os.listdir(file)
for name in names:
fullname = os.path.join(file, name)
if ((os.path.isdir(fullname) and
not os.path.islink(fullname))
or os.path.normcase(name[-3:]) == ".py"):
check(fullname)
return
try:
f = open(file)
except IOError as msg:
errprint("%r: I/O Error: %s" % (file, msg))
return
if verbose > 1:
print("checking %r ..." % (file,))
ok = AppendChecker(file, f).run()
if verbose and ok:
print("%r: Clean bill of health." % (file,))
[FIND_DOT,
FIND_APPEND,
FIND_LPAREN,
FIND_COMMA,
FIND_STMT] = range(5)
class AppendChecker:
def __init__(self, fname, file):
self.fname = fname
self.file = file
self.state = FIND_DOT
self.nerrors = 0
def run(self):
try:
tokens = tokenize.generate_tokens(self.file.readline)
for _token in tokens:
self.tokeneater(*_token)
except tokenize.TokenError as msg:
errprint("%r: Token Error: %s" % (self.fname, msg))
self.nerrors = self.nerrors + 1
return self.nerrors == 0
def tokeneater(self, type, token, start, end, line,
NEWLINE=tokenize.NEWLINE,
JUNK=(tokenize.COMMENT, tokenize.NL),
OP=tokenize.OP,
NAME=tokenize.NAME):
state = self.state
if type in JUNK:
pass
elif state is FIND_DOT:
if type is OP and token == ".":
state = FIND_APPEND
elif state is FIND_APPEND:
if type is NAME and token == "append":
self.line = line
self.lineno = start[0]
state = FIND_LPAREN
else:
state = FIND_DOT
elif state is FIND_LPAREN:
if type is OP and token == "(":
self.level = 1
state = FIND_COMMA
else:
state = FIND_DOT
elif state is FIND_COMMA:
if type is OP:
if token in ("(", "{", "["):
self.level = self.level + 1
elif token in (")", "}", "]"):
self.level = self.level - 1
if self.level == 0:
state = FIND_DOT
elif token == "," and self.level == 1:
self.nerrors = self.nerrors + 1
print("%s(%d):\n%s" % (self.fname, self.lineno,
self.line))
# don't gripe about this stmt again
state = FIND_STMT
elif state is FIND_STMT:
if type is NEWLINE:
state = FIND_DOT
else:
raise SystemError("unknown internal state '%r'" % (state,))
self.state = state
if __name__ == '__main__':
main()
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