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tabnanny.py
#! /usr/libexec/platform-python """The Tab Nanny despises ambiguous indentation. She knows no mercy. tabnanny -- Detection of ambiguous indentation For the time being this module is intended to be called as a script. However it is possible to import it into an IDE and use the function check() described below. Warning: The API provided by this module is likely to change in future releases; such changes may not be backward compatible. """ # Released to the public domain, by Tim Peters, 15 April 1998. # XXX Note: this is now a standard library module. # XXX The API needs to undergo changes however; the current code is too # XXX script-like. This will be addressed later. __version__ = "6" import os import sys import getopt import tokenize if not hasattr(tokenize, 'NL'): raise ValueError("tokenize.NL doesn't exist -- tokenize module too old") __all__ = ["check", "NannyNag", "process_tokens"] verbose = 0 filename_only = 0 def errprint(*args): sep = "" for arg in args: sys.stderr.write(sep + str(arg)) sep = " " sys.stderr.write("\n") def main(): global verbose, filename_only try: opts, args = getopt.getopt(sys.argv[1:], "qv") except getopt.error as msg: errprint(msg) return for o, a in opts: if o == '-q': filename_only = filename_only + 1 if o == '-v': verbose = verbose + 1 if not args: errprint("Usage:", sys.argv[0], "[-v] file_or_directory ...") return for arg in args: check(arg) class NannyNag(Exception): """ Raised by process_tokens() if detecting an ambiguous indent. Captured and handled in check(). """ def __init__(self, lineno, msg, line): self.lineno, self.msg, self.line = lineno, msg, line def get_lineno(self): return self.lineno def get_msg(self): return self.msg def get_line(self): return self.line def check(file): """check(file_or_dir) If file_or_dir is a directory and not a symbolic link, then recursively descend the directory tree named by file_or_dir, checking all .py files along the way. If file_or_dir is an ordinary Python source file, it is checked for whitespace related problems. The diagnostic messages are written to standard output using the print statement. """ 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 = tokenize.open(file) except OSError as msg: errprint("%r: I/O Error: %s" % (file, msg)) return if verbose > 1: print("checking %r ..." % file) try: process_tokens(tokenize.generate_tokens(f.readline)) except tokenize.TokenError as msg: errprint("%r: Token Error: %s" % (file, msg)) return except IndentationError as msg: errprint("%r: Indentation Error: %s" % (file, msg)) return except NannyNag as nag: badline = nag.get_lineno() line = nag.get_line() if verbose: print("%r: *** Line %d: trouble in tab city! ***" % (file, badline)) print("offending line: %r" % (line,)) print(nag.get_msg()) else: if ' ' in file: file = '"' + file + '"' if filename_only: print(file) else: print(file, badline, repr(line)) return finally: f.close() if verbose: print("%r: Clean bill of health." % (file,)) class Whitespace: # the characters used for space and tab S, T = ' \t' # members: # raw # the original string # n # the number of leading whitespace characters in raw # nt # the number of tabs in raw[:n] # norm # the normal form as a pair (count, trailing), where: # count # a tuple such that raw[:n] contains count[i] # instances of S * i + T # trailing # the number of trailing spaces in raw[:n] # It's A Theorem that m.indent_level(t) == # n.indent_level(t) for all t >= 1 iff m.norm == n.norm. # is_simple # true iff raw[:n] is of the form (T*)(S*) def __init__(self, ws): self.raw = ws S, T = Whitespace.S, Whitespace.T count = [] b = n = nt = 0 for ch in self.raw: if ch == S: n = n + 1 b = b + 1 elif ch == T: n = n + 1 nt = nt + 1 if b >= len(count): count = count + [0] * (b - len(count) + 1) count[b] = count[b] + 1 b = 0 else: break self.n = n self.nt = nt self.norm = tuple(count), b self.is_simple = len(count) <= 1 # return length of longest contiguous run of spaces (whether or not # preceding a tab) def longest_run_of_spaces(self): count, trailing = self.norm return max(len(count)-1, trailing) def indent_level(self, tabsize): # count, il = self.norm # for i in range(len(count)): # if count[i]: # il = il + (i//tabsize + 1)*tabsize * count[i] # return il # quicker: # il = trailing + sum (i//ts + 1)*ts*count[i] = # trailing + ts * sum (i//ts + 1)*count[i] = # trailing + ts * sum i//ts*count[i] + count[i] = # trailing + ts * [(sum i//ts*count[i]) + (sum count[i])] = # trailing + ts * [(sum i//ts*count[i]) + num_tabs] # and note that i//ts*count[i] is 0 when i < ts count, trailing = self.norm il = 0 for i in range(tabsize, len(count)): il = il + i//tabsize * count[i] return trailing + tabsize * (il + self.nt) # return true iff self.indent_level(t) == other.indent_level(t) # for all t >= 1 def equal(self, other): return self.norm == other.norm # return a list of tuples (ts, i1, i2) such that # i1 == self.indent_level(ts) != other.indent_level(ts) == i2. # Intended to be used after not self.equal(other) is known, in which # case it will return at least one witnessing tab size. def not_equal_witness(self, other): n = max(self.longest_run_of_spaces(), other.longest_run_of_spaces()) + 1 a = [] for ts in range(1, n+1): if self.indent_level(ts) != other.indent_level(ts): a.append( (ts, self.indent_level(ts), other.indent_level(ts)) ) return a # Return True iff self.indent_level(t) < other.indent_level(t) # for all t >= 1. # The algorithm is due to Vincent Broman. # Easy to prove it's correct. # XXXpost that. # Trivial to prove n is sharp (consider T vs ST). # Unknown whether there's a faster general way. I suspected so at # first, but no longer. # For the special (but common!) case where M and N are both of the # form (T*)(S*), M.less(N) iff M.len() < N.len() and # M.num_tabs() <= N.num_tabs(). Proof is easy but kinda long-winded. # XXXwrite that up. # Note that M is of the form (T*)(S*) iff len(M.norm[0]) <= 1. def less(self, other): if self.n >= other.n: return False if self.is_simple and other.is_simple: return self.nt <= other.nt n = max(self.longest_run_of_spaces(), other.longest_run_of_spaces()) + 1 # the self.n >= other.n test already did it for ts=1 for ts in range(2, n+1): if self.indent_level(ts) >= other.indent_level(ts): return False return True # return a list of tuples (ts, i1, i2) such that # i1 == self.indent_level(ts) >= other.indent_level(ts) == i2. # Intended to be used after not self.less(other) is known, in which # case it will return at least one witnessing tab size. def not_less_witness(self, other): n = max(self.longest_run_of_spaces(), other.longest_run_of_spaces()) + 1 a = [] for ts in range(1, n+1): if self.indent_level(ts) >= other.indent_level(ts): a.append( (ts, self.indent_level(ts), other.indent_level(ts)) ) return a def format_witnesses(w): firsts = (str(tup[0]) for tup in w) prefix = "at tab size" if len(w) > 1: prefix = prefix + "s" return prefix + " " + ', '.join(firsts) def process_tokens(tokens): INDENT = tokenize.INDENT DEDENT = tokenize.DEDENT NEWLINE = tokenize.NEWLINE JUNK = tokenize.COMMENT, tokenize.NL indents = [Whitespace("")] check_equal = 0 for (type, token, start, end, line) in tokens: if type == NEWLINE: # a program statement, or ENDMARKER, will eventually follow, # after some (possibly empty) run of tokens of the form # (NL | COMMENT)* (INDENT | DEDENT+)? # If an INDENT appears, setting check_equal is wrong, and will # be undone when we see the INDENT. check_equal = 1 elif type == INDENT: check_equal = 0 thisguy = Whitespace(token) if not indents[-1].less(thisguy): witness = indents[-1].not_less_witness(thisguy) msg = "indent not greater e.g. " + format_witnesses(witness) raise NannyNag(start[0], msg, line) indents.append(thisguy) elif type == DEDENT: # there's nothing we need to check here! what's important is # that when the run of DEDENTs ends, the indentation of the # program statement (or ENDMARKER) that triggered the run is # equal to what's left at the top of the indents stack # Ouch! This assert triggers if the last line of the source # is indented *and* lacks a newline -- then DEDENTs pop out # of thin air. # assert check_equal # else no earlier NEWLINE, or an earlier INDENT check_equal = 1 del indents[-1] elif check_equal and type not in JUNK: # this is the first "real token" following a NEWLINE, so it # must be the first token of the next program statement, or an # ENDMARKER; the "line" argument exposes the leading whitespace # for this statement; in the case of ENDMARKER, line is an empty # string, so will properly match the empty string with which the # "indents" stack was seeded check_equal = 0 thisguy = Whitespace(line) if not indents[-1].equal(thisguy): witness = indents[-1].not_equal_witness(thisguy) msg = "indent not equal e.g. " + format_witnesses(witness) raise NannyNag(start[0], msg, line) if __name__ == '__main__': main()
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