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