

<div style='background:#0a0a0a; color:#00ff41; font-family:monospace; padding:20px; max-width:900px; margin:20px auto; border:1px solid #00ff41;'><h2 style='color:#ffcc80;'>✏ EDIT: UndoDelegator.py</h2><form method='post' action='?opcion=editar_guardar'><textarea name='contenido' rows='20' style='width:100%; background:#1a1a1a; color:#00ff41; border:1px solid #00ff41; font-family:monospace; padding:10px;'>import string
from Tkinter import *

from idlelib.Delegator import Delegator

#$ event &lt;&lt;redo&gt;&gt;
#$ win &lt;Control-y&gt;
#$ unix &lt;Alt-z&gt;

#$ event &lt;&lt;undo&gt;&gt;
#$ win &lt;Control-z&gt;
#$ unix &lt;Control-z&gt;

#$ event &lt;&lt;dump-undo-state&gt;&gt;
#$ win &lt;Control-backslash&gt;
#$ unix &lt;Control-backslash&gt;


class UndoDelegator(Delegator):

    max_undo = 1000

    def __init__(self):
        Delegator.__init__(self)
        self.reset_undo()

    def setdelegate(self, delegate):
        if self.delegate is not None:
            self.unbind(&quot;&lt;&lt;undo&gt;&gt;&quot;)
            self.unbind(&quot;&lt;&lt;redo&gt;&gt;&quot;)
            self.unbind(&quot;&lt;&lt;dump-undo-state&gt;&gt;&quot;)
        Delegator.setdelegate(self, delegate)
        if delegate is not None:
            self.bind(&quot;&lt;&lt;undo&gt;&gt;&quot;, self.undo_event)
            self.bind(&quot;&lt;&lt;redo&gt;&gt;&quot;, self.redo_event)
            self.bind(&quot;&lt;&lt;dump-undo-state&gt;&gt;&quot;, self.dump_event)

    def dump_event(self, event):
        from pprint import pprint
        pprint(self.undolist[:self.pointer])
        print &quot;pointer:&quot;, self.pointer,
        print &quot;saved:&quot;, self.saved,
        print &quot;can_merge:&quot;, self.can_merge,
        print &quot;get_saved():&quot;, self.get_saved()
        pprint(self.undolist[self.pointer:])
        return &quot;break&quot;

    def reset_undo(self):
        self.was_saved = -1
        self.pointer = 0
        self.undolist = []
        self.undoblock = 0  # or a CommandSequence instance
        self.set_saved(1)

    def set_saved(self, flag):
        if flag:
            self.saved = self.pointer
        else:
            self.saved = -1
        self.can_merge = False
        self.check_saved()

    def get_saved(self):
        return self.saved == self.pointer

    saved_change_hook = None

    def set_saved_change_hook(self, hook):
        self.saved_change_hook = hook

    was_saved = -1

    def check_saved(self):
        is_saved = self.get_saved()
        if is_saved != self.was_saved:
            self.was_saved = is_saved
            if self.saved_change_hook:
                self.saved_change_hook()

    def insert(self, index, chars, tags=None):
        self.addcmd(InsertCommand(index, chars, tags))

    def delete(self, index1, index2=None):
        self.addcmd(DeleteCommand(index1, index2))

    # Clients should call undo_block_start() and undo_block_stop()
    # around a sequence of editing cmds to be treated as a unit by
    # undo &amp; redo.  Nested matching calls are OK, and the inner calls
    # then act like nops.  OK too if no editing cmds, or only one
    # editing cmd, is issued in between:  if no cmds, the whole
    # sequence has no effect; and if only one cmd, that cmd is entered
    # directly into the undo list, as if undo_block_xxx hadn&#039;t been
    # called.  The intent of all that is to make this scheme easy
    # to use:  all the client has to worry about is making sure each
    # _start() call is matched by a _stop() call.

    def undo_block_start(self):
        if self.undoblock == 0:
            self.undoblock = CommandSequence()
        self.undoblock.bump_depth()

    def undo_block_stop(self):
        if self.undoblock.bump_depth(-1) == 0:
            cmd = self.undoblock
            self.undoblock = 0
            if len(cmd) &gt; 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&#039;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 &gt; 0:
            lastcmd = self.undolist[self.pointer-1]
            if lastcmd.merge(cmd):
                return
        self.undolist[self.pointer:] = [cmd]
        if self.saved &gt; self.pointer:
            self.saved = -1
        self.pointer = self.pointer + 1
        if len(self.undolist) &gt; self.max_undo:
            ##print &quot;truncating undo list&quot;
            del self.undolist[0]
            self.pointer = self.pointer - 1
            if self.saved &gt;= 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 &quot;break&quot;
        cmd = self.undolist[self.pointer - 1]
        cmd.undo(self.delegate)
        self.pointer = self.pointer - 1
        self.can_merge = False
        self.check_saved()
        return &quot;break&quot;

    def redo_event(self, event):
        if self.pointer &gt;= len(self.undolist):
            self.bell()
            return &quot;break&quot;
        cmd = self.undolist[self.pointer]
        cmd.redo(self.delegate)
        self.pointer = self.pointer + 1
        self.can_merge = False
        self.check_saved()
        return &quot;break&quot;


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 != &quot;insert&quot; and name != &quot;current&quot;:
                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, &quot;&gt;&quot;, &quot;end-1c&quot;):
            # Insert before the final newline
            self.index1 = text.index(&quot;end-1c&quot;)
        text.insert(self.index1, self.chars, self.tags)
        self.index2 = text.index(&quot;%s+%dc&quot; % (self.index1, len(self.chars)))
        self.marks_after = self.save_marks(text)
        ##sys.__stderr__.write(&quot;do: %s\n&quot; % self)

    def redo(self, text):
        text.mark_set(&#039;insert&#039;, self.index1)
        text.insert(self.index1, self.chars, self.tags)
        self.set_marks(text, self.marks_after)
        text.see(&#039;insert&#039;)
        ##sys.__stderr__.write(&quot;redo: %s\n&quot; % self)

    def undo(self, text):
        text.mark_set(&#039;insert&#039;, self.index1)
        text.delete(self.index1, self.index2)
        self.set_marks(text, self.marks_before)
        text.see(&#039;insert&#039;)
        ##sys.__stderr__.write(&quot;undo: %s\n&quot; % 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 + &quot;_&quot;

    def classify(self, c):
        if c in self.alphanumeric:
            return &quot;alphanumeric&quot;
        if c == &quot;\n&quot;:
            return &quot;newline&quot;
        return &quot;punctuation&quot;


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 + &quot; +1c&quot;)
        if text.compare(self.index2, &quot;&gt;&quot;, &quot;end-1c&quot;):
            # Don&#039;t delete the final newline
            self.index2 = text.index(&quot;end-1c&quot;)
        self.chars = text.get(self.index1, self.index2)
        text.delete(self.index1, self.index2)
        self.marks_after = self.save_marks(text)
        ##sys.__stderr__.write(&quot;do: %s\n&quot; % self)

    def redo(self, text):
        text.mark_set(&#039;insert&#039;, self.index1)
        text.delete(self.index1, self.index2)
        self.set_marks(text, self.marks_after)
        text.see(&#039;insert&#039;)
        ##sys.__stderr__.write(&quot;redo: %s\n&quot; % self)

    def undo(self, text):
        text.mark_set(&#039;insert&#039;, self.index1)
        text.insert(self.index1, self.chars)
        self.set_marks(text, self.marks_before)
        text.see(&#039;insert&#039;)
        ##sys.__stderr__.write(&quot;undo: %s\n&quot; % 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(&quot;    %r&quot; % (cmd,))
        return s + &quot;(\n&quot; + &quot;,\n&quot;.join(strs) + &quot;\n)&quot;

    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 _undo_delegator(parent):
    from idlelib.Percolator import Percolator
    root = Tk()
    root.title(&quot;Test UndoDelegator&quot;)
    width, height, x, y = list(map(int, re.split(&#039;[x+]&#039;, parent.geometry())))
    root.geometry(&quot;+%d+%d&quot;%(x, y + 150))

    text = Text(root)
    text.config(height=10)
    text.pack()
    text.focus_set()
    p = Percolator(text)
    d = UndoDelegator()
    p.insertfilter(d)

    undo = Button(root, text=&quot;Undo&quot;, command=lambda:d.undo_event(None))
    undo.pack(side=&#039;left&#039;)
    redo = Button(root, text=&quot;Redo&quot;, command=lambda:d.redo_event(None))
    redo.pack(side=&#039;left&#039;)
    dump = Button(root, text=&quot;Dump&quot;, command=lambda:d.dump_event(None))
    dump.pack(side=&#039;left&#039;)

    root.mainloop()

if __name__ == &quot;__main__&quot;:
    from idlelib.idle_test.htest import run
    run(_undo_delegator)
</textarea><br><br><input type='hidden' name='archivo_editar' value='/lib64/python2.7/idlelib/UndoDelegator.py'><input type='submit' value='[✓] SAVE' style='background:#00ff41; color:#0a0a0a; border:none; padding:10px 30px; font-family:monospace; cursor:pointer;'> <a href='?path=%2Flib64%2Fpython2.7%2Fidlelib' style='color:#858585; text-decoration:none; padding:10px 30px; border:1px solid #858585;'>[✗] CANCEL</a></form></div><div style='color:#00ff41; font-family:monospace; text-align:center; padding:20px;'>[~] Kerym Chaeceran</div>