Lib/idlelib/AutoExpand.py

   1 import string
   2 import re
   3
   4 ###$ event <<expand-word>>
   5 ###$ win <Alt-slash>
   6 ###$ unix <Alt-slash>
   7
   8 class AutoExpand:
   9
  10     keydefs = {
  11         '<<expand-word>>': ['<Alt-slash>'],
  12     }
  13
  14     unix_keydefs = {
  15         '<<expand-word>>': ['<Meta-slash>'],
  16     }
  17
  18     menudefs = [
  19         ('edit', [
  20             ('E_xpand word', '<<expand-word>>'),
  21          ]),
  22     ]
  23
  24     wordchars = string.letters + string.digits + "_"
  25
  26     def __init__(self, editwin):
  27         self.text = editwin.text
  28         self.text.wordlist = None # XXX what is this?
  29         self.state = None
  30
  31     def expand_word_event(self, event):
  32         curinsert = self.text.index("insert")
  33         curline = self.text.get("insert linestart", "insert lineend")
  34         if not self.state:
  35             words = self.getwords()
  36             index = 0
  37         else:
  38             words, index, insert, line = self.state
  39             if insert != curinsert or line != curline:
  40                 words = self.getwords()
  41                 index = 0
  42         if not words:
  43             self.text.bell()
  44             return "break"
  45         word = self.getprevword()
  46         self.text.delete("insert - %d chars" % len(word), "insert")
  47         newword = words[index]
  48         index = (index + 1) % len(words)
  49         if index == 0:
  50             self.text.bell()            # Warn we cycled around
  51         self.text.insert("insert", newword)
  52         curinsert = self.text.index("insert")
  53         curline = self.text.get("insert linestart", "insert lineend")
  54         self.state = words, index, curinsert, curline
  55         return "break"
  56
  57     def getwords(self):
  58         word = self.getprevword()
  59         if not word:
  60             return []
  61         before = self.text.get("1.0", "insert wordstart")
  62         wbefore = re.findall(r"\b" + word + r"\w+\b", before)
  63         del before
  64         after = self.text.get("insert wordend", "end")
  65         wafter = re.findall(r"\b" + word + r"\w+\b", after)
  66         del after
  67         if not wbefore and not wafter:
  68             return []
  69         words = []
  70         dict = {}
  71         # search backwards through words before
  72         wbefore.reverse()
  73         for w in wbefore:
  74             if dict.get(w):
  75                 continue
  76             words.append(w)
  77             dict[w] = w
  78         # search onwards through words after
  79         for w in wafter:
  80             if dict.get(w):
  81                 continue
  82             words.append(w)
  83             dict[w] = w
  84         words.append(word)
  85         return words
  86
  87     def getprevword(self):
  88         line = self.text.get("insert linestart", "insert")
  89         i = len(line)
  90         while i > 0 and line[i-1] in self.wordchars:
  91             i = i-1
  92         return line[i:]