717 lines
25 KiB
Python
717 lines
25 KiB
Python
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"""
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Renders the command line on the console.
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(Redraws parts of the input line that were changed.)
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"""
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from asyncio import FIRST_COMPLETED, Future, sleep, wait
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from collections import deque
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from enum import Enum
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from typing import TYPE_CHECKING, Any, Callable, Deque, Dict, Hashable, Optional, Tuple
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from prompt_toolkit.application.current import get_app
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from prompt_toolkit.data_structures import Point, Size
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from prompt_toolkit.filters import FilterOrBool, to_filter
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from prompt_toolkit.formatted_text import AnyFormattedText, to_formatted_text
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from prompt_toolkit.input.base import Input
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from prompt_toolkit.layout.mouse_handlers import MouseHandlers
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from prompt_toolkit.layout.screen import Char, Screen, WritePosition
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from prompt_toolkit.output import ColorDepth, Output
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from prompt_toolkit.styles import (
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Attrs,
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BaseStyle,
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DummyStyleTransformation,
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StyleTransformation,
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)
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from prompt_toolkit.utils import is_windows
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if TYPE_CHECKING:
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from prompt_toolkit.application import Application
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from prompt_toolkit.layout.layout import Layout
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__all__ = [
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"Renderer",
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"print_formatted_text",
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]
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def _output_screen_diff(
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app: "Application[Any]",
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output: Output,
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screen: Screen,
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current_pos: Point,
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color_depth: ColorDepth,
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previous_screen: Optional[Screen],
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last_style: Optional[str],
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is_done: bool, # XXX: drop is_done
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full_screen: bool,
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attrs_for_style_string: "_StyleStringToAttrsCache",
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size: Size,
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previous_width: int,
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) -> Tuple[Point, Optional[str]]:
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"""
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Render the diff between this screen and the previous screen.
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This takes two `Screen` instances. The one that represents the output like
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it was during the last rendering and one that represents the current
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output raster. Looking at these two `Screen` instances, this function will
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render the difference by calling the appropriate methods of the `Output`
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object that only paint the changes to the terminal.
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This is some performance-critical code which is heavily optimized.
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Don't change things without profiling first.
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:param current_pos: Current cursor position.
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:param last_style: The style string, used for drawing the last drawn
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character. (Color/attributes.)
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:param attrs_for_style_string: :class:`._StyleStringToAttrsCache` instance.
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:param width: The width of the terminal.
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:param previous_width: The width of the terminal during the last rendering.
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"""
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width, height = size.columns, size.rows
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#: Variable for capturing the output.
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write = output.write
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write_raw = output.write_raw
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# Create locals for the most used output methods.
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# (Save expensive attribute lookups.)
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_output_set_attributes = output.set_attributes
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_output_reset_attributes = output.reset_attributes
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_output_cursor_forward = output.cursor_forward
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_output_cursor_up = output.cursor_up
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_output_cursor_backward = output.cursor_backward
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# Hide cursor before rendering. (Avoid flickering.)
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output.hide_cursor()
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def reset_attributes() -> None:
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" Wrapper around Output.reset_attributes. "
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nonlocal last_style
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_output_reset_attributes()
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last_style = None # Forget last char after resetting attributes.
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def move_cursor(new: Point) -> Point:
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" Move cursor to this `new` point. Returns the given Point. "
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current_x, current_y = current_pos.x, current_pos.y
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if new.y > current_y:
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# Use newlines instead of CURSOR_DOWN, because this might add new lines.
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# CURSOR_DOWN will never create new lines at the bottom.
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# Also reset attributes, otherwise the newline could draw a
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# background color.
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reset_attributes()
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write("\r\n" * (new.y - current_y))
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current_x = 0
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_output_cursor_forward(new.x)
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return new
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elif new.y < current_y:
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_output_cursor_up(current_y - new.y)
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if current_x >= width - 1:
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write("\r")
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_output_cursor_forward(new.x)
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elif new.x < current_x or current_x >= width - 1:
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_output_cursor_backward(current_x - new.x)
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elif new.x > current_x:
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_output_cursor_forward(new.x - current_x)
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return new
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def output_char(char: Char) -> None:
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"""
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Write the output of this character.
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"""
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nonlocal last_style
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# If the last printed character has the same style, don't output the
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# style again.
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if last_style == char.style:
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write(char.char)
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else:
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# Look up `Attr` for this style string. Only set attributes if different.
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# (Two style strings can still have the same formatting.)
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# Note that an empty style string can have formatting that needs to
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# be applied, because of style transformations.
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new_attrs = attrs_for_style_string[char.style]
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if not last_style or new_attrs != attrs_for_style_string[last_style]:
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_output_set_attributes(new_attrs, color_depth)
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write(char.char)
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last_style = char.style
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# Render for the first time: reset styling.
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if not previous_screen:
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reset_attributes()
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# Disable autowrap. (When entering a the alternate screen, or anytime when
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# we have a prompt. - In the case of a REPL, like IPython, people can have
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# background threads, and it's hard for debugging if their output is not
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# wrapped.)
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if not previous_screen or not full_screen:
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output.disable_autowrap()
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# When the previous screen has a different size, redraw everything anyway.
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# Also when we are done. (We might take up less rows, so clearing is important.)
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if (
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is_done or not previous_screen or previous_width != width
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): # XXX: also consider height??
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current_pos = move_cursor(Point(x=0, y=0))
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reset_attributes()
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output.erase_down()
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previous_screen = Screen()
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# Get height of the screen.
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# (height changes as we loop over data_buffer, so remember the current value.)
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# (Also make sure to clip the height to the size of the output.)
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current_height = min(screen.height, height)
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# Loop over the rows.
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row_count = min(max(screen.height, previous_screen.height), height)
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c = 0 # Column counter.
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for y in range(row_count):
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new_row = screen.data_buffer[y]
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previous_row = previous_screen.data_buffer[y]
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zero_width_escapes_row = screen.zero_width_escapes[y]
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new_max_line_len = min(width - 1, max(new_row.keys()) if new_row else 0)
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previous_max_line_len = min(
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width - 1, max(previous_row.keys()) if previous_row else 0
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)
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# Loop over the columns.
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c = 0
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while c < new_max_line_len + 1:
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new_char = new_row[c]
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old_char = previous_row[c]
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char_width = new_char.width or 1
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# When the old and new character at this position are different,
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# draw the output. (Because of the performance, we don't call
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# `Char.__ne__`, but inline the same expression.)
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if new_char.char != old_char.char or new_char.style != old_char.style:
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current_pos = move_cursor(Point(x=c, y=y))
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# Send injected escape sequences to output.
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if c in zero_width_escapes_row:
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write_raw(zero_width_escapes_row[c])
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output_char(new_char)
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current_pos = Point(x=current_pos.x + char_width, y=current_pos.y)
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c += char_width
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# If the new line is shorter, trim it.
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if previous_screen and new_max_line_len < previous_max_line_len:
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current_pos = move_cursor(Point(x=new_max_line_len + 1, y=y))
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reset_attributes()
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output.erase_end_of_line()
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# Correctly reserve vertical space as required by the layout.
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# When this is a new screen (drawn for the first time), or for some reason
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# higher than the previous one. Move the cursor once to the bottom of the
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# output. That way, we're sure that the terminal scrolls up, even when the
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# lower lines of the canvas just contain whitespace.
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# The most obvious reason that we actually want this behaviour is the avoid
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# the artifact of the input scrolling when the completion menu is shown.
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# (If the scrolling is actually wanted, the layout can still be build in a
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# way to behave that way by setting a dynamic height.)
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if current_height > previous_screen.height:
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current_pos = move_cursor(Point(x=0, y=current_height - 1))
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# Move cursor:
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if is_done:
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current_pos = move_cursor(Point(x=0, y=current_height))
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output.erase_down()
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else:
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current_pos = move_cursor(screen.get_cursor_position(app.layout.current_window))
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if is_done or not full_screen:
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output.enable_autowrap()
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# Always reset the color attributes. This is important because a background
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# thread could print data to stdout and we want that to be displayed in the
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# default colors. (Also, if a background color has been set, many terminals
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# give weird artifacts on resize events.)
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reset_attributes()
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if screen.show_cursor or is_done:
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output.show_cursor()
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return current_pos, last_style
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class HeightIsUnknownError(Exception):
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" Information unavailable. Did not yet receive the CPR response. "
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class _StyleStringToAttrsCache(Dict[str, Attrs]):
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"""
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A cache structure that maps style strings to :class:`.Attr`.
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(This is an important speed up.)
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"""
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def __init__(
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self,
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get_attrs_for_style_str: Callable[["str"], Attrs],
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style_transformation: StyleTransformation,
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) -> None:
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self.get_attrs_for_style_str = get_attrs_for_style_str
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self.style_transformation = style_transformation
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def __missing__(self, style_str: str) -> Attrs:
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attrs = self.get_attrs_for_style_str(style_str)
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attrs = self.style_transformation.transform_attrs(attrs)
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self[style_str] = attrs
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return attrs
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class CPR_Support(Enum):
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" Enum: whether or not CPR is supported. "
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SUPPORTED = "SUPPORTED"
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NOT_SUPPORTED = "NOT_SUPPORTED"
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UNKNOWN = "UNKNOWN"
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class Renderer:
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"""
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Typical usage:
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::
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output = Vt100_Output.from_pty(sys.stdout)
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r = Renderer(style, output)
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r.render(app, layout=...)
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"""
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CPR_TIMEOUT = 2 # Time to wait until we consider CPR to be not supported.
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def __init__(
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self,
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style: BaseStyle,
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output: Output,
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input: Input,
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full_screen: bool = False,
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mouse_support: FilterOrBool = False,
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cpr_not_supported_callback: Optional[Callable[[], None]] = None,
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) -> None:
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self.style = style
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self.output = output
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self.input = input
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self.full_screen = full_screen
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self.mouse_support = to_filter(mouse_support)
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self.cpr_not_supported_callback = cpr_not_supported_callback
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self._in_alternate_screen = False
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self._mouse_support_enabled = False
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self._bracketed_paste_enabled = False
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# Future set when we are waiting for a CPR flag.
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self._waiting_for_cpr_futures: Deque[Future[None]] = deque()
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self.cpr_support = CPR_Support.UNKNOWN
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if not input.responds_to_cpr:
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self.cpr_support = CPR_Support.NOT_SUPPORTED
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# Cache for the style.
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self._attrs_for_style: Optional[_StyleStringToAttrsCache] = None
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self._last_style_hash: Optional[Hashable] = None
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self._last_transformation_hash: Optional[Hashable] = None
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self._last_color_depth: Optional[ColorDepth] = None
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self.reset(_scroll=True)
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def reset(self, _scroll: bool = False, leave_alternate_screen: bool = True) -> None:
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# Reset position
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self._cursor_pos = Point(x=0, y=0)
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# Remember the last screen instance between renderers. This way,
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# we can create a `diff` between two screens and only output the
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# difference. It's also to remember the last height. (To show for
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# instance a toolbar at the bottom position.)
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self._last_screen: Optional[Screen] = None
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self._last_size: Optional[Size] = None
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self._last_style: Optional[str] = None
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# Default MouseHandlers. (Just empty.)
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self.mouse_handlers = MouseHandlers()
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#: Space from the top of the layout, until the bottom of the terminal.
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#: We don't know this until a `report_absolute_cursor_row` call.
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self._min_available_height = 0
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# In case of Windows, also make sure to scroll to the current cursor
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# position. (Only when rendering the first time.)
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if is_windows() and _scroll:
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self.output.scroll_buffer_to_prompt()
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# Quit alternate screen.
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if self._in_alternate_screen and leave_alternate_screen:
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self.output.quit_alternate_screen()
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self._in_alternate_screen = False
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# Disable mouse support.
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if self._mouse_support_enabled:
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self.output.disable_mouse_support()
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self._mouse_support_enabled = False
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# Disable bracketed paste.
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if self._bracketed_paste_enabled:
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self.output.disable_bracketed_paste()
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self._bracketed_paste_enabled = False
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|
# Flush output. `disable_mouse_support` needs to write to stdout.
|
||
|
|
self.output.flush()
|
||
|
|
|
||
|
|
@property
|
||
|
|
def last_rendered_screen(self) -> Optional[Screen]:
|
||
|
|
"""
|
||
|
|
The `Screen` class that was generated during the last rendering.
|
||
|
|
This can be `None`.
|
||
|
|
"""
|
||
|
|
return self._last_screen
|
||
|
|
|
||
|
|
@property
|
||
|
|
def height_is_known(self) -> bool:
|
||
|
|
"""
|
||
|
|
True when the height from the cursor until the bottom of the terminal
|
||
|
|
is known. (It's often nicer to draw bottom toolbars only if the height
|
||
|
|
is known, in order to avoid flickering when the CPR response arrives.)
|
||
|
|
"""
|
||
|
|
return (
|
||
|
|
self.full_screen or self._min_available_height > 0 or is_windows()
|
||
|
|
) # On Windows, we don't have to wait for a CPR.
|
||
|
|
|
||
|
|
@property
|
||
|
|
def rows_above_layout(self) -> int:
|
||
|
|
"""
|
||
|
|
Return the number of rows visible in the terminal above the layout.
|
||
|
|
"""
|
||
|
|
if self._in_alternate_screen:
|
||
|
|
return 0
|
||
|
|
elif self._min_available_height > 0:
|
||
|
|
total_rows = self.output.get_size().rows
|
||
|
|
last_screen_height = self._last_screen.height if self._last_screen else 0
|
||
|
|
return total_rows - max(self._min_available_height, last_screen_height)
|
||
|
|
else:
|
||
|
|
raise HeightIsUnknownError("Rows above layout is unknown.")
|
||
|
|
|
||
|
|
def request_absolute_cursor_position(self) -> None:
|
||
|
|
"""
|
||
|
|
Get current cursor position.
|
||
|
|
|
||
|
|
We do this to calculate the minimum available height that we can
|
||
|
|
consume for rendering the prompt. This is the available space below te
|
||
|
|
cursor.
|
||
|
|
|
||
|
|
For vt100: Do CPR request. (answer will arrive later.)
|
||
|
|
For win32: Do API call. (Answer comes immediately.)
|
||
|
|
"""
|
||
|
|
# Only do this request when the cursor is at the top row. (after a
|
||
|
|
# clear or reset). We will rely on that in `report_absolute_cursor_row`.
|
||
|
|
assert self._cursor_pos.y == 0
|
||
|
|
|
||
|
|
# In full-screen mode, always use the total height as min-available-height.
|
||
|
|
if self.full_screen:
|
||
|
|
self._min_available_height = self.output.get_size().rows
|
||
|
|
|
||
|
|
# For Win32, we have an API call to get the number of rows below the
|
||
|
|
# cursor.
|
||
|
|
elif is_windows():
|
||
|
|
self._min_available_height = self.output.get_rows_below_cursor_position()
|
||
|
|
|
||
|
|
# Use CPR.
|
||
|
|
else:
|
||
|
|
if self.cpr_support == CPR_Support.NOT_SUPPORTED:
|
||
|
|
return
|
||
|
|
|
||
|
|
def do_cpr() -> None:
|
||
|
|
# Asks for a cursor position report (CPR).
|
||
|
|
self._waiting_for_cpr_futures.append(Future())
|
||
|
|
self.output.ask_for_cpr()
|
||
|
|
|
||
|
|
if self.cpr_support == CPR_Support.SUPPORTED:
|
||
|
|
do_cpr()
|
||
|
|
|
||
|
|
# If we don't know whether CPR is supported, only do a request if
|
||
|
|
# none is pending, and test it, using a timer.
|
||
|
|
elif self.cpr_support == CPR_Support.UNKNOWN and not self.waiting_for_cpr:
|
||
|
|
do_cpr()
|
||
|
|
|
||
|
|
async def timer() -> None:
|
||
|
|
await sleep(self.CPR_TIMEOUT)
|
||
|
|
|
||
|
|
# Not set in the meantime -> not supported.
|
||
|
|
if self.cpr_support == CPR_Support.UNKNOWN:
|
||
|
|
self.cpr_support = CPR_Support.NOT_SUPPORTED
|
||
|
|
|
||
|
|
if self.cpr_not_supported_callback:
|
||
|
|
# Make sure to call this callback in the main thread.
|
||
|
|
self.cpr_not_supported_callback()
|
||
|
|
|
||
|
|
get_app().create_background_task(timer())
|
||
|
|
|
||
|
|
def report_absolute_cursor_row(self, row: int) -> None:
|
||
|
|
"""
|
||
|
|
To be called when we know the absolute cursor position.
|
||
|
|
(As an answer of a "Cursor Position Request" response.)
|
||
|
|
"""
|
||
|
|
self.cpr_support = CPR_Support.SUPPORTED
|
||
|
|
|
||
|
|
# Calculate the amount of rows from the cursor position until the
|
||
|
|
# bottom of the terminal.
|
||
|
|
total_rows = self.output.get_size().rows
|
||
|
|
rows_below_cursor = total_rows - row + 1
|
||
|
|
|
||
|
|
# Set the minimum available height.
|
||
|
|
self._min_available_height = rows_below_cursor
|
||
|
|
|
||
|
|
# Pop and set waiting for CPR future.
|
||
|
|
try:
|
||
|
|
f = self._waiting_for_cpr_futures.popleft()
|
||
|
|
except IndexError:
|
||
|
|
pass # Received CPR response without having a CPR.
|
||
|
|
else:
|
||
|
|
f.set_result(None)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def waiting_for_cpr(self) -> bool:
|
||
|
|
"""
|
||
|
|
Waiting for CPR flag. True when we send the request, but didn't got a
|
||
|
|
response.
|
||
|
|
"""
|
||
|
|
return bool(self._waiting_for_cpr_futures)
|
||
|
|
|
||
|
|
async def wait_for_cpr_responses(self, timeout: int = 1) -> None:
|
||
|
|
"""
|
||
|
|
Wait for a CPR response.
|
||
|
|
"""
|
||
|
|
cpr_futures = list(self._waiting_for_cpr_futures) # Make copy.
|
||
|
|
|
||
|
|
# When there are no CPRs in the queue. Don't do anything.
|
||
|
|
if not cpr_futures or self.cpr_support == CPR_Support.NOT_SUPPORTED:
|
||
|
|
return None
|
||
|
|
|
||
|
|
async def wait_for_responses() -> None:
|
||
|
|
for response_f in cpr_futures:
|
||
|
|
await response_f
|
||
|
|
|
||
|
|
async def wait_for_timeout() -> None:
|
||
|
|
await sleep(timeout)
|
||
|
|
|
||
|
|
# Got timeout, erase queue.
|
||
|
|
self._waiting_for_cpr_futures = deque()
|
||
|
|
|
||
|
|
coroutines = [
|
||
|
|
wait_for_responses(),
|
||
|
|
wait_for_timeout(),
|
||
|
|
]
|
||
|
|
await wait(coroutines, return_when=FIRST_COMPLETED)
|
||
|
|
|
||
|
|
def render(
|
||
|
|
self, app: "Application[Any]", layout: "Layout", is_done: bool = False
|
||
|
|
) -> None:
|
||
|
|
"""
|
||
|
|
Render the current interface to the output.
|
||
|
|
|
||
|
|
:param is_done: When True, put the cursor at the end of the interface. We
|
||
|
|
won't print any changes to this part.
|
||
|
|
"""
|
||
|
|
output = self.output
|
||
|
|
|
||
|
|
# Enter alternate screen.
|
||
|
|
if self.full_screen and not self._in_alternate_screen:
|
||
|
|
self._in_alternate_screen = True
|
||
|
|
output.enter_alternate_screen()
|
||
|
|
|
||
|
|
# Enable bracketed paste.
|
||
|
|
if not self._bracketed_paste_enabled:
|
||
|
|
self.output.enable_bracketed_paste()
|
||
|
|
self._bracketed_paste_enabled = True
|
||
|
|
|
||
|
|
# Enable/disable mouse support.
|
||
|
|
needs_mouse_support = self.mouse_support()
|
||
|
|
|
||
|
|
if needs_mouse_support and not self._mouse_support_enabled:
|
||
|
|
output.enable_mouse_support()
|
||
|
|
self._mouse_support_enabled = True
|
||
|
|
|
||
|
|
elif not needs_mouse_support and self._mouse_support_enabled:
|
||
|
|
output.disable_mouse_support()
|
||
|
|
self._mouse_support_enabled = False
|
||
|
|
|
||
|
|
# Create screen and write layout to it.
|
||
|
|
size = output.get_size()
|
||
|
|
screen = Screen()
|
||
|
|
screen.show_cursor = False # Hide cursor by default, unless one of the
|
||
|
|
# containers decides to display it.
|
||
|
|
mouse_handlers = MouseHandlers()
|
||
|
|
|
||
|
|
# Calculate height.
|
||
|
|
if self.full_screen:
|
||
|
|
height = size.rows
|
||
|
|
elif is_done:
|
||
|
|
# When we are done, we don't necessary want to fill up until the bottom.
|
||
|
|
height = layout.container.preferred_height(
|
||
|
|
size.columns, size.rows
|
||
|
|
).preferred
|
||
|
|
else:
|
||
|
|
last_height = self._last_screen.height if self._last_screen else 0
|
||
|
|
height = max(
|
||
|
|
self._min_available_height,
|
||
|
|
last_height,
|
||
|
|
layout.container.preferred_height(size.columns, size.rows).preferred,
|
||
|
|
)
|
||
|
|
|
||
|
|
height = min(height, size.rows)
|
||
|
|
|
||
|
|
# When te size changes, don't consider the previous screen.
|
||
|
|
if self._last_size != size:
|
||
|
|
self._last_screen = None
|
||
|
|
|
||
|
|
# When we render using another style or another color depth, do a full
|
||
|
|
# repaint. (Forget about the previous rendered screen.)
|
||
|
|
# (But note that we still use _last_screen to calculate the height.)
|
||
|
|
if (
|
||
|
|
self.style.invalidation_hash() != self._last_style_hash
|
||
|
|
or app.style_transformation.invalidation_hash()
|
||
|
|
!= self._last_transformation_hash
|
||
|
|
or app.color_depth != self._last_color_depth
|
||
|
|
):
|
||
|
|
self._last_screen = None
|
||
|
|
self._attrs_for_style = None
|
||
|
|
|
||
|
|
if self._attrs_for_style is None:
|
||
|
|
self._attrs_for_style = _StyleStringToAttrsCache(
|
||
|
|
self.style.get_attrs_for_style_str, app.style_transformation
|
||
|
|
)
|
||
|
|
|
||
|
|
self._last_style_hash = self.style.invalidation_hash()
|
||
|
|
self._last_transformation_hash = app.style_transformation.invalidation_hash()
|
||
|
|
self._last_color_depth = app.color_depth
|
||
|
|
|
||
|
|
layout.container.write_to_screen(
|
||
|
|
screen,
|
||
|
|
mouse_handlers,
|
||
|
|
WritePosition(xpos=0, ypos=0, width=size.columns, height=height,),
|
||
|
|
parent_style="",
|
||
|
|
erase_bg=False,
|
||
|
|
z_index=None,
|
||
|
|
)
|
||
|
|
screen.draw_all_floats()
|
||
|
|
|
||
|
|
# When grayed. Replace all styles in the new screen.
|
||
|
|
if app.exit_style:
|
||
|
|
screen.append_style_to_content(app.exit_style)
|
||
|
|
|
||
|
|
# Process diff and write to output.
|
||
|
|
self._cursor_pos, self._last_style = _output_screen_diff(
|
||
|
|
app,
|
||
|
|
output,
|
||
|
|
screen,
|
||
|
|
self._cursor_pos,
|
||
|
|
app.color_depth,
|
||
|
|
self._last_screen,
|
||
|
|
self._last_style,
|
||
|
|
is_done,
|
||
|
|
full_screen=self.full_screen,
|
||
|
|
attrs_for_style_string=self._attrs_for_style,
|
||
|
|
size=size,
|
||
|
|
previous_width=(self._last_size.columns if self._last_size else 0),
|
||
|
|
)
|
||
|
|
self._last_screen = screen
|
||
|
|
self._last_size = size
|
||
|
|
self.mouse_handlers = mouse_handlers
|
||
|
|
|
||
|
|
output.flush()
|
||
|
|
|
||
|
|
# Set visible windows in layout.
|
||
|
|
app.layout.visible_windows = screen.visible_windows
|
||
|
|
|
||
|
|
if is_done:
|
||
|
|
self.reset()
|
||
|
|
|
||
|
|
def erase(self, leave_alternate_screen: bool = True) -> None:
|
||
|
|
"""
|
||
|
|
Hide all output and put the cursor back at the first line. This is for
|
||
|
|
instance used for running a system command (while hiding the CLI) and
|
||
|
|
later resuming the same CLI.)
|
||
|
|
|
||
|
|
:param leave_alternate_screen: When True, and when inside an alternate
|
||
|
|
screen buffer, quit the alternate screen.
|
||
|
|
"""
|
||
|
|
output = self.output
|
||
|
|
|
||
|
|
output.cursor_backward(self._cursor_pos.x)
|
||
|
|
output.cursor_up(self._cursor_pos.y)
|
||
|
|
output.erase_down()
|
||
|
|
output.reset_attributes()
|
||
|
|
output.enable_autowrap()
|
||
|
|
output.flush()
|
||
|
|
|
||
|
|
self.reset(leave_alternate_screen=leave_alternate_screen)
|
||
|
|
|
||
|
|
def clear(self) -> None:
|
||
|
|
"""
|
||
|
|
Clear screen and go to 0,0
|
||
|
|
"""
|
||
|
|
# Erase current output first.
|
||
|
|
self.erase()
|
||
|
|
|
||
|
|
# Send "Erase Screen" command and go to (0, 0).
|
||
|
|
output = self.output
|
||
|
|
|
||
|
|
output.erase_screen()
|
||
|
|
output.cursor_goto(0, 0)
|
||
|
|
output.flush()
|
||
|
|
|
||
|
|
self.request_absolute_cursor_position()
|
||
|
|
|
||
|
|
|
||
|
|
def print_formatted_text(
|
||
|
|
output: Output,
|
||
|
|
formatted_text: AnyFormattedText,
|
||
|
|
style: BaseStyle,
|
||
|
|
style_transformation: Optional[StyleTransformation] = None,
|
||
|
|
color_depth: Optional[ColorDepth] = None,
|
||
|
|
) -> None:
|
||
|
|
"""
|
||
|
|
Print a list of (style_str, text) tuples in the given style to the output.
|
||
|
|
"""
|
||
|
|
fragments = to_formatted_text(formatted_text)
|
||
|
|
style_transformation = style_transformation or DummyStyleTransformation()
|
||
|
|
color_depth = color_depth or ColorDepth.default()
|
||
|
|
|
||
|
|
# Reset first.
|
||
|
|
output.reset_attributes()
|
||
|
|
output.enable_autowrap()
|
||
|
|
|
||
|
|
# Print all (style_str, text) tuples.
|
||
|
|
attrs_for_style_string = _StyleStringToAttrsCache(
|
||
|
|
style.get_attrs_for_style_str, style_transformation
|
||
|
|
)
|
||
|
|
|
||
|
|
for style_str, text, *_ in fragments:
|
||
|
|
attrs = attrs_for_style_string[style_str]
|
||
|
|
|
||
|
|
if attrs:
|
||
|
|
output.set_attributes(attrs, color_depth)
|
||
|
|
else:
|
||
|
|
output.reset_attributes()
|
||
|
|
|
||
|
|
# Eliminate carriage returns
|
||
|
|
text = text.replace("\r", "")
|
||
|
|
|
||
|
|
# Assume that the output is raw, and insert a carriage return before
|
||
|
|
# every newline. (Also important when the front-end is a telnet client.)
|
||
|
|
output.write(text.replace("\n", "\r\n"))
|
||
|
|
|
||
|
|
# Reset again.
|
||
|
|
output.reset_attributes()
|
||
|
|
output.flush()
|