Lib/idlelib/IdleHistory.py

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