Consistent Case: A Simple Linter

[Moshe Zadka]

# Released to the public domain by Moshe Zadka
# use like: get_identifiers <module1> <module2> ....
import parser, keyword

def get_from_tuple(l, so_far = None):
        if so_far is None:
                so_far = []
        if l[0] == 1 and not keyword.iskeyword(l[1]):
                so_far.append(l[1:])
        else:
                for t in l:
                        if type(t) is type(()):
                                get_from_tuple(t, so_far)
        return so_far

def get_from_file(file, res=None):
        tup = parser.suite(file.read()).totuple(1)
        return get_from_tuple(tup, res)

def by_case(words_by_file):
        import string
        res = {}
        for file, words in words_by_file.items():
                for word, lineno in words:
                        lword = string.lower(word)
                        if not res.has_key(lword):
                                res[lword] = []
                        res[lword].append((lineno, file, word))
        return res

def get_suspicious(words_by_case):
        susp = []
        for word, cases in words_by_case.items():
                c = cases[0][2]
                for tup in cases[1:]:
                        if  tup[2] != c:
                                susp.append(word)
                                break
        return susp
def main():
        import sys
        res = {}
        for file in sys.argv[1:]:
                f = open(file)
                try:
                        res[file] = get_from_file(f)
                finally:
                        f.close()
        res = by_case(res)
        susp = get_suspicious(res)
        susp.sort()
        for word in susp:
                print word, 'is used with incosistent case:'
                for line, file, case in res[word]:
                        print '\t%(file)s[%(line)d]: %(case)s' % vars()

if __name__=='__main__':
        main()


--
Moshe Zadka <moshez at math.huji.ac.il>
http://www.oreilly.com/news/prescod_0300.html
http://www.linux.org.il -- we put the penguin in .com