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Python Source  |  2011-02-15  |  3.1 KB  |  89 lines
  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
  89.