Lib/idlelib/IdleHistory.py

   1 import string
   2
   3 class History:
   4
   5     def __init__(self, text, output_sep = "\n"):
   6         self.text = text
   7         self.history = []
   8         self.history_prefix = None
   9         self.history_pointer = None
  10         self.output_sep = output_sep
  11         text.bind("<<history-previous>>", self.history_prev)
  12         text.bind("<<history-next>>", self.history_next)
  13
  14     def history_next(self, event):
  15         self.history_do(0)
  16         return "break"
  17
  18     def history_prev(self, event):
  19         self.history_do(1)
  20         return "break"
  21
  22     def _get_source(self, start, end):
  23         # Get source code from start index to end index.  Lines in the
  24         # text control may be separated by sys.ps2 .
  25         lines = string.split(self.text.get(start, end), self.output_sep)
  26         return string.join(lines, "\n")
  27
  28     def _put_source(self, where, source):
  29         output = string.join(string.split(source, "\n"), self.output_sep)
  30         self.text.insert(where, output)
  31
  32     def history_do(self, reverse):
  33         nhist = len(self.history)
  34         pointer = self.history_pointer
  35         prefix = self.history_prefix
  36         if pointer is not None and prefix is not None:
  37             if self.text.compare("insert", "!=", "end-1c") or \
  38                self._get_source("iomark", "end-1c") != self.history[pointer]:
  39                 pointer = prefix = None
  40         if pointer is None or prefix is None:
  41             prefix = self._get_source("iomark", "end-1c")
  42             if reverse:
  43                 pointer = nhist
  44             else:
  45                 pointer = -1
  46         nprefix = len(prefix)
  47         while 1:
  48             if reverse:
  49                 pointer = pointer - 1
  50             else:
  51                 pointer = pointer + 1
  52             if pointer < 0 or pointer >= nhist:
  53                 self.text.bell()
  54                 if self._get_source("iomark", "end-1c") != prefix:
  55                     self.text.delete("iomark", "end-1c")
  56                     self._put_source("iomark", prefix)
  57                 pointer = prefix = None
  58                 break
  59             item = self.history[pointer]
  60             if item[:nprefix] == prefix and len(item) > nprefix:
  61                 self.text.delete("iomark", "end-1c")
  62                 self._put_source("iomark", item)
  63                 break
  64         self.text.mark_set("insert", "end-1c")
  65         self.text.see("insert")
  66         self.text.tag_remove("sel", "1.0", "end")
  67         self.history_pointer = pointer
  68         self.history_prefix = prefix
  69
  70     def history_store(self, source):
  71         source = string.strip(source)
  72         if len(source) > 2:
  73             # avoid duplicates
  74             try:
  75                 self.history.remove(source)
  76             except ValueError:
  77                 pass
  78             self.history.append(source)
  79         self.history_pointer = None
  80         self.history_prefix = None
  81
  82     def recall(self, s):
  83         s = string.strip(s)
  84         self.text.tag_remove("sel", "1.0", "end")
  85         self.text.delete("iomark", "end-1c")
  86         self.text.mark_set("insert", "end-1c")
  87         self.text.insert("insert", s)
  88         self.text.see("insert")