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checkappend.py
#! /usr/bin/python2.7 # 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, 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, 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: tokenize.tokenize(self.file.readline, self.tokeneater) except tokenize.TokenError, 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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