EcchiShell v1.0

usr

lib64

0: if len(cmd) == 1: # no need to wrap a single cmd cmd = cmd.getcmd(0) # this blk of cmds, or single cmd, has already # been done, so don't execute it again self.addcmd(cmd, 0) def addcmd(self, cmd, execute=True): if execute: cmd.do(self.delegate) if self.undoblock != 0: self.undoblock.append(cmd) return if self.can_merge and self.pointer > 0: lastcmd = self.undolist[self.pointer-1] if lastcmd.merge(cmd): return self.undolist[self.pointer:] = [cmd] if self.saved > self.pointer: self.saved = -1 self.pointer = self.pointer + 1 if len(self.undolist) > self.max_undo: ##print "truncating undo list" del self.undolist[0] self.pointer = self.pointer - 1 if self.saved >= 0: self.saved = self.saved - 1 self.can_merge = True self.check_saved() def undo_event(self, event): if self.pointer == 0: self.bell() return "break" cmd = self.undolist[self.pointer - 1] cmd.undo(self.delegate) self.pointer = self.pointer - 1 self.can_merge = False self.check_saved() return "break" def redo_event(self, event): if self.pointer >= len(self.undolist): self.bell() return "break" cmd = self.undolist[self.pointer] cmd.redo(self.delegate) self.pointer = self.pointer + 1 self.can_merge = False self.check_saved() return "break" class Command: # Base class for Undoable commands tags = None def __init__(self, index1, index2, chars, tags=None): self.marks_before = {} self.marks_after = {} self.index1 = index1 self.index2 = index2 self.chars = chars if tags: self.tags = tags def __repr__(self): s = self.__class__.__name__ t = (self.index1, self.index2, self.chars, self.tags) if self.tags is None: t = t[:-1] return s + repr(t) def do(self, text): pass def redo(self, text): pass def undo(self, text): pass def merge(self, cmd): return 0 def save_marks(self, text): marks = {} for name in text.mark_names(): if name != "insert" and name != "current": marks[name] = text.index(name) return marks def set_marks(self, text, marks): for name, index in marks.items(): text.mark_set(name, index) class InsertCommand(Command): # Undoable insert command def __init__(self, index1, chars, tags=None): Command.__init__(self, index1, None, chars, tags) def do(self, text): self.marks_before = self.save_marks(text) self.index1 = text.index(self.index1) if text.compare(self.index1, ">", "end-1c"): # Insert before the final newline self.index1 = text.index("end-1c") text.insert(self.index1, self.chars, self.tags) self.index2 = text.index("%s+%dc" % (self.index1, len(self.chars))) self.marks_after = self.save_marks(text) ##sys.__stderr__.write("do: %s\n" % self) def redo(self, text): text.mark_set('insert', self.index1) text.insert(self.index1, self.chars, self.tags) self.set_marks(text, self.marks_after) text.see('insert') ##sys.__stderr__.write("redo: %s\n" % self) def undo(self, text): text.mark_set('insert', self.index1) text.delete(self.index1, self.index2) self.set_marks(text, self.marks_before) text.see('insert') ##sys.__stderr__.write("undo: %s\n" % self) def merge(self, cmd): if self.__class__ is not cmd.__class__: return False if self.index2 != cmd.index1: return False if self.tags != cmd.tags: return False if len(cmd.chars) != 1: return False if self.chars and \ self.classify(self.chars[-1]) != self.classify(cmd.chars): return False self.index2 = cmd.index2 self.chars = self.chars + cmd.chars return True alphanumeric = string.ascii_letters + string.digits + "_" def classify(self, c): if c in self.alphanumeric: return "alphanumeric" if c == "\n": return "newline" return "punctuation" class DeleteCommand(Command): # Undoable delete command def __init__(self, index1, index2=None): Command.__init__(self, index1, index2, None, None) def do(self, text): self.marks_before = self.save_marks(text) self.index1 = text.index(self.index1) if self.index2: self.index2 = text.index(self.index2) else: self.index2 = text.index(self.index1 + " +1c") if text.compare(self.index2, ">", "end-1c"): # Don't delete the final newline self.index2 = text.index("end-1c") self.chars = text.get(self.index1, self.index2) text.delete(self.index1, self.index2) self.marks_after = self.save_marks(text) ##sys.__stderr__.write("do: %s\n" % self) def redo(self, text): text.mark_set('insert', self.index1) text.delete(self.index1, self.index2) self.set_marks(text, self.marks_after) text.see('insert') ##sys.__stderr__.write("redo: %s\n" % self) def undo(self, text): text.mark_set('insert', self.index1) text.insert(self.index1, self.chars) self.set_marks(text, self.marks_before) text.see('insert') ##sys.__stderr__.write("undo: %s\n" % self) class CommandSequence(Command): # Wrapper for a sequence of undoable cmds to be undone/redone # as a unit def __init__(self): self.cmds = [] self.depth = 0 def __repr__(self): s = self.__class__.__name__ strs = [] for cmd in self.cmds: strs.append(" %r" % (cmd,)) return s + "(\n" + ",\n".join(strs) + "\n)" def __len__(self): return len(self.cmds) def append(self, cmd): self.cmds.append(cmd) def getcmd(self, i): return self.cmds[i] def redo(self, text): for cmd in self.cmds: cmd.redo(text) def undo(self, text): cmds = self.cmds[:] cmds.reverse() for cmd in cmds: cmd.undo(text) def bump_depth(self, incr=1): self.depth = self.depth + incr return self.depth def main(): from idlelib.Percolator import Percolator root = Tk() root.wm_protocol("WM_DELETE_WINDOW", root.quit) text = Text() text.pack() text.focus_set() p = Percolator(text) d = UndoDelegator() p.insertfilter(d) root.mainloop() if __name__ == "__main__": main()