add ydb deps

1 files changed, 42 insertions, 0 deletions

diff --git a/contrib/python/prompt-toolkit/py2/prompt_toolkit/clipboard/in_memory.py b/contrib/python/prompt-toolkit/py2/prompt_toolkit/clipboard/in_memory.py
new file mode 100644
index 0000000000..081666ab80
--- /dev/null
+++ b/contrib/python/prompt-toolkit/py2/prompt_toolkit/clipboard/in_memory.py
@@ -0,0 +1,42 @@
+from .base import Clipboard, ClipboardData
+
+from collections import deque
+
+__all__ = (
+    'InMemoryClipboard',
+)
+
+
+class InMemoryClipboard(Clipboard):
+    """
+    Default clipboard implementation.
+    Just keep the data in memory.
+
+    This implements a kill-ring, for Emacs mode.
+    """
+    def __init__(self, data=None, max_size=60):
+        assert data is None or isinstance(data, ClipboardData)
+        assert max_size >= 1
+
+        self.max_size = max_size
+        self._ring = deque()
+        if data is not None:
+            self.set_data(data)
+
+    def set_data(self, data):
+        assert isinstance(data, ClipboardData)
+        self._ring.appendleft(data)
+
+        while len(self._ring) > self.max_size:
+            self._ring.pop()
+
+    def get_data(self):
+        if self._ring:
+            return self._ring[0]
+        else:
+            return ClipboardData()
+
+    def rotate(self):
+        if self._ring:
+            # Add the very first item at the end.
+            self._ring.append(self._ring.popleft())