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import contextlib
import re
import string
import urwid
def _is_valid_key(char):
return urwid.is_wide_char(char, 0) or (
len(char) == 1 and ord(char) >= 32
)
class AutocompleteState:
def __init__(self, prefix, infix, suffix, cycle_forward):
self.prefix = prefix
self.infix = infix
self.suffix = suffix
self.num = 0 if cycle_forward else -1
class PasteBuffer(list):
def append(self, text):
if not len(text):
return
super().append(text)
class UndoState:
def __init__(self, edit_pos, edit_text):
self.edit_pos = edit_pos
self.edit_text = edit_text
class UndoBuffer:
def __init__(self):
self.pos = 0
self.buffer = []
@property
def empty(self):
return self.pos == 0
@property
def cur(self):
return self.buffer[self.pos - 1]
def push(self, old_state, new_state):
self.buffer = self.buffer[: self.pos]
if old_state.edit_text != new_state.edit_text:
self.buffer.append((old_state, new_state))
self.pos = len(self.buffer)
def pop(self):
if not self.empty:
self.pos -= 1
class ReadlineEdit(urwid.Edit):
ignore_focus = False
def __init__(
self,
*args,
word_chars=string.ascii_letters + string.digits + "_",
max_char=None,
**kwargs
):
if max_char and "edit_text" in kwargs:
kwargs["edit_text"] = kwargs["edit_text"][:max_char]
super().__init__(*args, **kwargs)
self._word_regex1 = re.compile(
"([%s]+)" % "|".join(re.escape(ch) for ch in word_chars)
)
self._word_regex2 = re.compile(
"([^%s]+)" % "|".join(re.escape(ch) for ch in word_chars)
)
self._autocomplete_state = None
self._autocomplete_func = None
self._autocomplete_key = None
self._autocomplete_key_reverse = None
self._autocomplete_delims = " \t\n;"
self._max_char = max_char
self._paste_buffer = PasteBuffer()
self._undo_buffer = UndoBuffer()
self.size = (30,) # SET MAXCOL DEFAULT VALUE
self.keymap = {
"ctrl f": self.forward_char,
"ctrl b": self.backward_char,
"ctrl a": self.beginning_of_line,
"ctrl e": self.end_of_line,
"home": self.beginning_of_line,
"end": self.end_of_line,
"meta f": self.forward_word,
"meta b": self.backward_word,
"shift right": self.forward_word,
"shift left": self.backward_word,
"ctrl d": self.delete_char,
"ctrl h": self.backward_delete_char,
"delete": self.delete_char,
"backspace": self.backward_delete_char,
"ctrl u": self.backward_kill_line,
"ctrl k": self.forward_kill_line,
"meta x": self.kill_whole_line,
"meta d": self.kill_word,
"ctrl w": self.backward_kill_word,
"meta backspace": self.backward_kill_word,
"ctrl t": self.transpose_chars,
"ctrl l": self.clear_screen,
"ctrl y": self.paste,
"ctrl _": self.undo,
}
if self.multiline:
self.keymap.update(
{
"enter": self.insert_new_line,
}
)
def keypress(self, size, key):
self.size = size
if key == self._autocomplete_key and self._autocomplete_func:
self._complete(True)
return None
elif key == self._autocomplete_key_reverse and self._autocomplete_func:
self._complete(False)
return None
else:
self._autocomplete_state = None
if key == "right":
return None if self.forward_char() else key
if key == "left":
return None if self.backward_char() else key
if key == "up" or key == "ctrl p":
return None if self.previous_line() else key
if key == "down" or key == "ctrl n":
return None if self.next_line() else key
if key in self.keymap:
if self.keymap[key] == self.undo:
self.keymap[key]()
else:
with self._capture_undo():
self.keymap[key]()
self._invalidate()
return None
elif _is_valid_key(key):
with self._capture_undo():
self._insert_char_at_cursor(key)
self._invalidate()
return None
return key
def _insert_char_at_cursor(self, key):
if self._max_char and len(self.edit_text) == self._max_char:
return
self.set_edit_text(
self._edit_text[0 : self._edit_pos]
+ key
+ self._edit_text[self._edit_pos :]
)
self.set_edit_pos(self._edit_pos + 1)
def clear_screen(self):
self.set_edit_pos(0)
self.set_edit_text("")
def _make_undo_state(self):
return UndoState(self.edit_pos, self.edit_text)
def _apply_undo_state(self, state):
self.set_edit_text(state.edit_text)
self.set_edit_pos(state.edit_pos)
@contextlib.contextmanager
def _capture_undo(self):
old_state = self._make_undo_state()
yield
new_state = self._make_undo_state()
self._undo_buffer.push(old_state, new_state)
def undo(self):
if self._undo_buffer.empty:
return
old_state, new_state = self._undo_buffer.cur
self._undo_buffer.pop()
self._apply_undo_state(old_state)
def paste(self):
# do not paste if empty buffer
if not len(self._paste_buffer):
return
text = self._paste_buffer[-1]
if self._max_char:
chars_left = self._max_char - len(self.edit_text)
text = text[:chars_left]
self.set_edit_text(
self.edit_text[: self.edit_pos]
+ text
+ self.edit_text[self.edit_pos :]
)
self.set_edit_pos(self.edit_pos + len(text))
def previous_line(self):
x, y = self.get_cursor_coords(self.size)
return self.move_cursor_to_coords(self.size, x, y - 1)
def next_line(self):
x, y = self.get_cursor_coords(self.size)
return self.move_cursor_to_coords(self.size, x, y + 1)
def backward_char(self):
if self._edit_pos > 0:
self.set_edit_pos(self._edit_pos - 1)
return True
return False
def forward_char(self):
if self._edit_pos < len(self._edit_text):
self.set_edit_pos(self._edit_pos + 1)
return True
return False
def backward_word(self):
for match in self._word_regex1.finditer(
self._edit_text[0 : self._edit_pos][::-1]
):
self.set_edit_pos(self._edit_pos - match.end(1))
return
self.set_edit_pos(0)
def forward_word(self):
for match in self._word_regex2.finditer(
self._edit_text[self._edit_pos :]
):
self.set_edit_pos(self._edit_pos + match.end(1))
return
self.set_edit_pos(len(self._edit_text))
def delete_char(self):
if self._edit_pos < len(self._edit_text):
self.set_edit_text(
self._edit_text[0 : self._edit_pos]
+ self._edit_text[self._edit_pos + 1 :]
)
def backward_delete_char(self):
if self._edit_pos > 0:
self.set_edit_pos(self._edit_pos - 1)
self.set_edit_text(
self._edit_text[0 : self._edit_pos]
+ self._edit_text[self._edit_pos + 1 :]
)
def backward_kill_line(self):
for pos in reversed(range(0, self.edit_pos)):
if self.edit_text[pos] == "\n":
self._paste_buffer.append(
self.edit_text[pos + 1 : self.edit_pos]
)
self.set_edit_text(
self._edit_text[: pos + 1]
+ self._edit_text[self.edit_pos :]
)
self.edit_pos = pos + 1
return
self._paste_buffer.append(self.edit_text[: self.edit_pos])
self.set_edit_text(self._edit_text[self.edit_pos :])
self.edit_pos = 0
def forward_kill_line(self):
for pos in range(self.edit_pos, len(self.edit_text)):
if self.edit_text[pos] == "\n":
self._paste_buffer.append(self.edit_text[self.edit_pos : pos])
self.set_edit_text(
self._edit_text[: self.edit_pos] + self._edit_text[pos:]
)
return
self._paste_buffer.append(self.edit_text[self.edit_pos :])
self.set_edit_text(self._edit_text[: self.edit_pos])
def kill_whole_line(self):
buffer_length = len(self._paste_buffer)
self.backward_kill_line()
self.forward_kill_line()
if len(self._paste_buffer) - buffer_length == 2:
# if text was added from both forward and backward kill
self._paste_buffer[:2] = ["".join(self._paste_buffer[:2])]
def backward_kill_word(self):
pos = self._edit_pos
self.backward_word()
self._paste_buffer.append(self._edit_text[self.edit_pos : pos])
self.set_edit_text(
self._edit_text[: self._edit_pos] + self._edit_text[pos:]
)
def kill_word(self):
pos = self._edit_pos
self.forward_word()
self._paste_buffer.append(self.edit_text[pos : self.edit_pos])
self.set_edit_text(
self._edit_text[0:pos] + self._edit_text[self._edit_pos :]
)
self.set_edit_pos(pos)
def beginning_of_line(self):
x, y = self.get_cursor_coords(self.size)
if x == 0 and y > 0:
y -= 1
self.move_cursor_to_coords(self.size, 0, y)
def end_of_line(self):
text_length = len(self.edit_text)
# Move one character forward if at the end of a line.
if (
self.edit_pos < text_length
and self.edit_text[self.edit_pos] == "\n"
):
self.forward_char()
# Set the position of cursor at the next '\n'.
for pos in range(self.edit_pos, text_length + 1):
if pos == text_length:
self.set_edit_pos(pos)
return
elif self.edit_text[pos] == "\n":
self.set_edit_pos(pos)
return
def transpose_chars(self):
x, y = self.get_cursor_coords(self.size)
x = max(2, x + 1)
self.move_cursor_to_coords(self.size, x, y)
x, y = self.get_cursor_coords(self.size)
if x == 1:
# Don't transpose in case of single character
return
self.set_edit_text(
self._edit_text[0 : self._edit_pos - 2]
+ self._edit_text[self._edit_pos - 1]
+ self._edit_text[self._edit_pos - 2]
+ self._edit_text[self._edit_pos :]
)
def insert_new_line(self):
if self.multiline:
self.insert_text("\n")
def enable_autocomplete(self, func, key="tab", key_reverse="shift tab"):
self._autocomplete_func = func
self._autocomplete_key = key
self._autocomplete_key_reverse = key_reverse
self._autocomplete_state = None
def set_completer_delims(self, delimiters):
self._autocomplete_delims = delimiters
def _complete(self, cycle_forward):
if self._autocomplete_state:
if self._autocomplete_state.num == 0 and not cycle_forward:
self._autocomplete_state.num = None
elif self._autocomplete_state.num == -1 and cycle_forward:
self._autocomplete_state.num = None
else:
self._autocomplete_state.num += 1 if cycle_forward else -1
else:
text_before_caret = self.edit_text[0 : self.edit_pos]
text_after_caret = self.edit_text[self.edit_pos :]
if self._autocomplete_delims:
group = re.escape(self._autocomplete_delims)
match = re.match(
"^(?P<prefix>.*[" + group + "])(?P<infix>.*?)$",
text_before_caret,
flags=re.M | re.DOTALL,
)
if match:
prefix = match.group("prefix")
infix = match.group("infix")
else:
prefix = ""
infix = text_before_caret
else:
match = re.match(
"^(?P<infix>.*?)$",
text_before_caret,
flags=re.M | re.DOTALL,
)
prefix = ""
if match:
infix = match.group("infix")
else:
infix = text_before_caret
suffix = text_after_caret
self._autocomplete_state = AutocompleteState(
prefix, infix, suffix, cycle_forward
)
state = self._autocomplete_state
match = self._autocomplete_func(state.infix, state.num)
if not match:
match = state.infix
self._autocomplete_state = None
self.edit_text = state.prefix + match + state.suffix
self.edit_pos = len(state.prefix) + len(match)
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