import stringimport re ###$ event <<expand-word>>###$ win <Alt-slash>###$ unix <Alt-slash> class AutoExpand:     menudefs = [        ('edit', [            ('E_xpand Word', '<<expand-word>>'),         ]),    ]     wordchars = string.ascii_letters + string.digits + "_"     def __init__(self, editwin):        self.text = editwin.text        self.state = None     def expand_word_event(self, event):        curinsert = self.text.index("insert")        curline = self.text.get("insert linestart", "insert lineend")        if not self.state:            words = self.getwords()            index = 0        else:            words, index, insert, line = self.state            if insert != curinsert or line != curline:                words = self.getwords()                index = 0        if not words:            self.text.bell()            return "break"        word = self.getprevword()        self.text.delete("insert - %d chars" % len(word), "insert")        newword = words[index]        index = (index + 1) % len(words)        if index == 0:            self.text.bell()            # Warn we cycled around        self.text.insert("insert", newword)        curinsert = self.text.index("insert")        curline = self.text.get("insert linestart", "insert lineend")        self.state = words, index, curinsert, curline        return "break"     def getwords(self):        word = self.getprevword()        if not word:            return []        before = self.text.get("1.0", "insert wordstart")        wbefore = re.findall(r"\b" + word + r"\w+\b", before)        del before        after = self.text.get("insert wordend", "end")        wafter = re.findall(r"\b" + word + r"\w+\b", after)        del after        if not wbefore and not wafter:            return []        words = []        dict = {}        # search backwards through words before        wbefore.reverse()        for w in wbefore:            if dict.get(w):                continue            words.append(w)            dict[w] = w        # search onwards through words after        for w in wafter:            if dict.get(w):                continue            words.append(w)            dict[w] = w        words.append(word)        return words     def getprevword(self):        line = self.text.get("insert linestart", "insert")        i = len(line)        while i > 0 and line[i-1] in self.wordchars:            i = i-1        return line[i:]