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1'''Complete the current word before the cursor with words in the editor.
2
3Each menu selection or shortcut key selection replaces the word with a
4different word with the same prefix. The search for matches begins
5before the target and moves toward the top of the editor. It then starts
6after the cursor and moves down. It then returns to the original word and
7the cycle starts again.
8
9Changing the current text line or leaving the cursor in a different
10place before requesting the next selection causes AutoExpand to reset
11its state.
12
13This is an extension file and there is only one instance of AutoExpand.
14'''
15import re
16import string
17
18###$ event <<expand-word>>
19###$ win <Alt-slash>
20###$ unix <Alt-slash>
21
22class AutoExpand:
23
24    menudefs = [
25        ('edit', [
26            ('E_xpand Word', '<<expand-word>>'),
27         ]),
28    ]
29
30    wordchars = string.ascii_letters + string.digits + "_"
31
32    def __init__(self, editwin):
33        self.text = editwin.text
34        self.bell = self.text.bell
35        self.state = None
36
37    def expand_word_event(self, event):
38        "Replace the current word with the next expansion."
39        curinsert = self.text.index("insert")
40        curline = self.text.get("insert linestart", "insert lineend")
41        if not self.state:
42            words = self.getwords()
43            index = 0
44        else:
45            words, index, insert, line = self.state
46            if insert != curinsert or line != curline:
47                words = self.getwords()
48                index = 0
49        if not words:
50            self.bell()
51            return "break"
52        word = self.getprevword()
53        self.text.delete("insert - %d chars" % len(word), "insert")
54        newword = words[index]
55        index = (index + 1) % len(words)
56        if index == 0:
57            self.bell()            # Warn we cycled around
58        self.text.insert("insert", newword)
59        curinsert = self.text.index("insert")
60        curline = self.text.get("insert linestart", "insert lineend")
61        self.state = words, index, curinsert, curline
62        return "break"
63
64    def getwords(self):
65        "Return a list of words that match the prefix before the cursor."
66        word = self.getprevword()
67        if not word:
68            return []
69        before = self.text.get("1.0", "insert wordstart")
70        wbefore = re.findall(r"\b" + word + r"\w+\b", before)
71        del before
72        after = self.text.get("insert wordend", "end")
73        wafter = re.findall(r"\b" + word + r"\w+\b", after)
74        del after
75        if not wbefore and not wafter:
76            return []
77        words = []
78        dict = {}
79        # search backwards through words before
80        wbefore.reverse()
81        for w in wbefore:
82            if dict.get(w):
83                continue
84            words.append(w)
85            dict[w] = w
86        # search onwards through words after
87        for w in wafter:
88            if dict.get(w):
89                continue
90            words.append(w)
91            dict[w] = w
92        words.append(word)
93        return words
94
95    def getprevword(self):
96        "Return the word prefix before the cursor."
97        line = self.text.get("insert linestart", "insert")
98        i = len(line)
99        while i > 0 and line[i-1] in self.wordchars:
100            i = i-1
101        return line[i:]
102
103if __name__ == '__main__':
104    import unittest
105    unittest.main('idlelib.idle_test.test_autoexpand', verbosity=2)
106