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|
"""
Interface for an output.
"""
from __future__ import annotations
from abc import ABCMeta, abstractmethod
from typing import TextIO
from prompt_toolkit.cursor_shapes import CursorShape
from prompt_toolkit.data_structures import Size
from prompt_toolkit.styles import Attrs
from .color_depth import ColorDepth
__all__ = [
"Output",
"DummyOutput",
]
class Output(metaclass=ABCMeta):
"""
Base class defining the output interface for a
:class:`~prompt_toolkit.renderer.Renderer`.
Actual implementations are
:class:`~prompt_toolkit.output.vt100.Vt100_Output` and
:class:`~prompt_toolkit.output.win32.Win32Output`.
"""
stdout: TextIO | None = None
@abstractmethod
def fileno(self) -> int:
"Return the file descriptor to which we can write for the output."
@abstractmethod
def encoding(self) -> str:
"""
Return the encoding for this output, e.g. 'utf-8'.
(This is used mainly to know which characters are supported by the
output the data, so that the UI can provide alternatives, when
required.)
"""
@abstractmethod
def write(self, data: str) -> None:
"Write text (Terminal escape sequences will be removed/escaped.)"
@abstractmethod
def write_raw(self, data: str) -> None:
"Write text."
@abstractmethod
def set_title(self, title: str) -> None:
"Set terminal title."
@abstractmethod
def clear_title(self) -> None:
"Clear title again. (or restore previous title.)"
@abstractmethod
def flush(self) -> None:
"Write to output stream and flush."
@abstractmethod
def erase_screen(self) -> None:
"""
Erases the screen with the background colour and moves the cursor to
home.
"""
@abstractmethod
def enter_alternate_screen(self) -> None:
"Go to the alternate screen buffer. (For full screen applications)."
@abstractmethod
def quit_alternate_screen(self) -> None:
"Leave the alternate screen buffer."
@abstractmethod
def enable_mouse_support(self) -> None:
"Enable mouse."
@abstractmethod
def disable_mouse_support(self) -> None:
"Disable mouse."
@abstractmethod
def erase_end_of_line(self) -> None:
"""
Erases from the current cursor position to the end of the current line.
"""
@abstractmethod
def erase_down(self) -> None:
"""
Erases the screen from the current line down to the bottom of the
screen.
"""
@abstractmethod
def reset_attributes(self) -> None:
"Reset color and styling attributes."
@abstractmethod
def set_attributes(self, attrs: Attrs, color_depth: ColorDepth) -> None:
"Set new color and styling attributes."
@abstractmethod
def disable_autowrap(self) -> None:
"Disable auto line wrapping."
@abstractmethod
def enable_autowrap(self) -> None:
"Enable auto line wrapping."
@abstractmethod
def cursor_goto(self, row: int = 0, column: int = 0) -> None:
"Move cursor position."
@abstractmethod
def cursor_up(self, amount: int) -> None:
"Move cursor `amount` place up."
@abstractmethod
def cursor_down(self, amount: int) -> None:
"Move cursor `amount` place down."
@abstractmethod
def cursor_forward(self, amount: int) -> None:
"Move cursor `amount` place forward."
@abstractmethod
def cursor_backward(self, amount: int) -> None:
"Move cursor `amount` place backward."
@abstractmethod
def hide_cursor(self) -> None:
"Hide cursor."
@abstractmethod
def show_cursor(self) -> None:
"Show cursor."
@abstractmethod
def set_cursor_shape(self, cursor_shape: CursorShape) -> None:
"Set cursor shape to block, beam or underline."
@abstractmethod
def reset_cursor_shape(self) -> None:
"Reset cursor shape."
def ask_for_cpr(self) -> None:
"""
Asks for a cursor position report (CPR).
(VT100 only.)
"""
@property
def responds_to_cpr(self) -> bool:
"""
`True` if the `Application` can expect to receive a CPR response after
calling `ask_for_cpr` (this will come back through the corresponding
`Input`).
This is used to determine the amount of available rows we have below
the cursor position. In the first place, we have this so that the drop
down autocompletion menus are sized according to the available space.
On Windows, we don't need this, there we have
`get_rows_below_cursor_position`.
"""
return False
@abstractmethod
def get_size(self) -> Size:
"Return the size of the output window."
def bell(self) -> None:
"Sound bell."
def enable_bracketed_paste(self) -> None:
"For vt100 only."
def disable_bracketed_paste(self) -> None:
"For vt100 only."
def reset_cursor_key_mode(self) -> None:
"""
For vt100 only.
Put the terminal in normal cursor mode (instead of application mode).
See: https://vt100.net/docs/vt100-ug/chapter3.html
"""
def scroll_buffer_to_prompt(self) -> None:
"For Win32 only."
def get_rows_below_cursor_position(self) -> int:
"For Windows only."
raise NotImplementedError
@abstractmethod
def get_default_color_depth(self) -> ColorDepth:
"""
Get default color depth for this output.
This value will be used if no color depth was explicitly passed to the
`Application`.
.. note::
If the `$PROMPT_TOOLKIT_COLOR_DEPTH` environment variable has been
set, then `outputs.defaults.create_output` will pass this value to
the implementation as the default_color_depth, which is returned
here. (This is not used when the output corresponds to a
prompt_toolkit SSH/Telnet session.)
"""
class DummyOutput(Output):
"""
For testing. An output class that doesn't render anything.
"""
def fileno(self) -> int:
"There is no sensible default for fileno()."
raise NotImplementedError
def encoding(self) -> str:
return "utf-8"
def write(self, data: str) -> None:
pass
def write_raw(self, data: str) -> None:
pass
def set_title(self, title: str) -> None:
pass
def clear_title(self) -> None:
pass
def flush(self) -> None:
pass
def erase_screen(self) -> None:
pass
def enter_alternate_screen(self) -> None:
pass
def quit_alternate_screen(self) -> None:
pass
def enable_mouse_support(self) -> None:
pass
def disable_mouse_support(self) -> None:
pass
def erase_end_of_line(self) -> None:
pass
def erase_down(self) -> None:
pass
def reset_attributes(self) -> None:
pass
def set_attributes(self, attrs: Attrs, color_depth: ColorDepth) -> None:
pass
def disable_autowrap(self) -> None:
pass
def enable_autowrap(self) -> None:
pass
def cursor_goto(self, row: int = 0, column: int = 0) -> None:
pass
def cursor_up(self, amount: int) -> None:
pass
def cursor_down(self, amount: int) -> None:
pass
def cursor_forward(self, amount: int) -> None:
pass
def cursor_backward(self, amount: int) -> None:
pass
def hide_cursor(self) -> None:
pass
def show_cursor(self) -> None:
pass
def set_cursor_shape(self, cursor_shape: CursorShape) -> None:
pass
def reset_cursor_shape(self) -> None:
pass
def ask_for_cpr(self) -> None:
pass
def bell(self) -> None:
pass
def enable_bracketed_paste(self) -> None:
pass
def disable_bracketed_paste(self) -> None:
pass
def scroll_buffer_to_prompt(self) -> None:
pass
def get_size(self) -> Size:
return Size(rows=40, columns=80)
def get_rows_below_cursor_position(self) -> int:
return 40
def get_default_color_depth(self) -> ColorDepth:
return ColorDepth.DEPTH_1_BIT
|
