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Diffstat (limited to '')
| -rw-r--r-- | src/prompt_toolkit/output/base.py | 329 |
1 files changed, 329 insertions, 0 deletions
diff --git a/src/prompt_toolkit/output/base.py b/src/prompt_toolkit/output/base.py new file mode 100644 index 0000000..c78677b --- /dev/null +++ b/src/prompt_toolkit/output/base.py @@ -0,0 +1,329 @@ +""" +Interface for an output. +""" +from abc import ABCMeta, abstractmethod +from typing import Optional, 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: Optional[TextIO] = 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 explicitely 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 |