• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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
13There is only one instance of Autoexpand.
14'''
15import re
16import string
17
18
19class AutoExpand:
20    wordchars = string.ascii_letters + string.digits + "_"
21
22    def __init__(self, editwin):
23        self.text = editwin.text
24        self.bell = self.text.bell
25        self.state = None
26
27    def expand_word_event(self, event):
28        "Replace the current word with the next expansion."
29        curinsert = self.text.index("insert")
30        curline = self.text.get("insert linestart", "insert lineend")
31        if not self.state:
32            words = self.getwords()
33            index = 0
34        else:
35            words, index, insert, line = self.state
36            if insert != curinsert or line != curline:
37                words = self.getwords()
38                index = 0
39        if not words:
40            self.bell()
41            return "break"
42        word = self.getprevword()
43        self.text.delete("insert - %d chars" % len(word), "insert")
44        newword = words[index]
45        index = (index + 1) % len(words)
46        if index == 0:
47            self.bell()            # Warn we cycled around
48        self.text.insert("insert", newword)
49        curinsert = self.text.index("insert")
50        curline = self.text.get("insert linestart", "insert lineend")
51        self.state = words, index, curinsert, curline
52        return "break"
53
54    def getwords(self):
55        "Return a list of words that match the prefix before the cursor."
56        word = self.getprevword()
57        if not word:
58            return []
59        before = self.text.get("1.0", "insert wordstart")
60        wbefore = re.findall(r"\b" + word + r"\w+\b", before)
61        del before
62        after = self.text.get("insert wordend", "end")
63        wafter = re.findall(r"\b" + word + r"\w+\b", after)
64        del after
65        if not wbefore and not wafter:
66            return []
67        words = []
68        dict = {}
69        # search backwards through words before
70        wbefore.reverse()
71        for w in wbefore:
72            if dict.get(w):
73                continue
74            words.append(w)
75            dict[w] = w
76        # search onwards through words after
77        for w in wafter:
78            if dict.get(w):
79                continue
80            words.append(w)
81            dict[w] = w
82        words.append(word)
83        return words
84
85    def getprevword(self):
86        "Return the word prefix before the cursor."
87        line = self.text.get("insert linestart", "insert")
88        i = len(line)
89        while i > 0 and line[i-1] in self.wordchars:
90            i = i-1
91        return line[i:]
92
93
94if __name__ == '__main__':
95    from unittest import main
96    main('idlelib.idle_test.test_autoexpand', verbosity=2)
97