740 lines
24 KiB
Python
740 lines
24 KiB
Python
from enum import IntEnum
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from functools import lru_cache
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from itertools import filterfalse
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from logging import getLogger
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from operator import attrgetter
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from typing import (
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TYPE_CHECKING,
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Dict,
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Iterable,
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List,
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NamedTuple,
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Optional,
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Sequence,
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Tuple,
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Type,
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Union,
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)
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from .cells import (
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_is_single_cell_widths,
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cached_cell_len,
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cell_len,
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get_character_cell_size,
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set_cell_size,
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)
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from .repr import Result, rich_repr
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from .style import Style
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if TYPE_CHECKING:
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from .console import Console, ConsoleOptions, RenderResult
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log = getLogger("rich")
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class ControlType(IntEnum):
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"""Non-printable control codes which typically translate to ANSI codes."""
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BELL = 1
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CARRIAGE_RETURN = 2
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HOME = 3
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CLEAR = 4
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SHOW_CURSOR = 5
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HIDE_CURSOR = 6
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ENABLE_ALT_SCREEN = 7
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DISABLE_ALT_SCREEN = 8
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CURSOR_UP = 9
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CURSOR_DOWN = 10
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CURSOR_FORWARD = 11
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CURSOR_BACKWARD = 12
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CURSOR_MOVE_TO_COLUMN = 13
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CURSOR_MOVE_TO = 14
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ERASE_IN_LINE = 15
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SET_WINDOW_TITLE = 16
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ControlCode = Union[
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Tuple[ControlType],
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Tuple[ControlType, Union[int, str]],
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Tuple[ControlType, int, int],
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]
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@rich_repr()
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class Segment(NamedTuple):
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"""A piece of text with associated style. Segments are produced by the Console render process and
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are ultimately converted in to strings to be written to the terminal.
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Args:
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text (str): A piece of text.
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style (:class:`~rich.style.Style`, optional): An optional style to apply to the text.
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control (Tuple[ControlCode], optional): Optional sequence of control codes.
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Attributes:
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cell_length (int): The cell length of this Segment.
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"""
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text: str
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style: Optional[Style] = None
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control: Optional[Sequence[ControlCode]] = None
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@property
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def cell_length(self) -> int:
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"""The number of terminal cells required to display self.text.
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Returns:
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int: A number of cells.
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"""
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text, _style, control = self
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return 0 if control else cell_len(text)
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def __rich_repr__(self) -> Result:
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yield self.text
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if self.control is None:
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if self.style is not None:
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yield self.style
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else:
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yield self.style
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yield self.control
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def __bool__(self) -> bool:
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"""Check if the segment contains text."""
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return bool(self.text)
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@property
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def is_control(self) -> bool:
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"""Check if the segment contains control codes."""
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return self.control is not None
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@classmethod
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@lru_cache(1024 * 16)
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def _split_cells(cls, segment: "Segment", cut: int) -> Tuple["Segment", "Segment"]:
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text, style, control = segment
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_Segment = Segment
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cell_length = segment.cell_length
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if cut >= cell_length:
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return segment, _Segment("", style, control)
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cell_size = get_character_cell_size
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pos = int((cut / cell_length) * len(text))
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before = text[:pos]
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cell_pos = cell_len(before)
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if cell_pos == cut:
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return (
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_Segment(before, style, control),
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_Segment(text[pos:], style, control),
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)
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while pos < len(text):
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char = text[pos]
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pos += 1
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cell_pos += cell_size(char)
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before = text[:pos]
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if cell_pos == cut:
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return (
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_Segment(before, style, control),
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_Segment(text[pos:], style, control),
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)
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if cell_pos > cut:
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return (
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_Segment(before[: pos - 1] + " ", style, control),
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_Segment(" " + text[pos:], style, control),
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)
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raise AssertionError("Will never reach here")
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def split_cells(self, cut: int) -> Tuple["Segment", "Segment"]:
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"""Split segment in to two segments at the specified column.
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If the cut point falls in the middle of a 2-cell wide character then it is replaced
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by two spaces, to preserve the display width of the parent segment.
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Returns:
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Tuple[Segment, Segment]: Two segments.
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"""
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text, style, control = self
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if _is_single_cell_widths(text):
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# Fast path with all 1 cell characters
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if cut >= len(text):
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return self, Segment("", style, control)
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return (
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Segment(text[:cut], style, control),
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Segment(text[cut:], style, control),
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)
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return self._split_cells(self, cut)
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@classmethod
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def line(cls) -> "Segment":
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"""Make a new line segment."""
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return cls("\n")
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@classmethod
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def apply_style(
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cls,
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segments: Iterable["Segment"],
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style: Optional[Style] = None,
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post_style: Optional[Style] = None,
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) -> Iterable["Segment"]:
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"""Apply style(s) to an iterable of segments.
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Returns an iterable of segments where the style is replaced by ``style + segment.style + post_style``.
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Args:
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segments (Iterable[Segment]): Segments to process.
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style (Style, optional): Base style. Defaults to None.
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post_style (Style, optional): Style to apply on top of segment style. Defaults to None.
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Returns:
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Iterable[Segments]: A new iterable of segments (possibly the same iterable).
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"""
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result_segments = segments
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if style:
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apply = style.__add__
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result_segments = (
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cls(text, None if control else apply(_style), control)
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for text, _style, control in result_segments
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)
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if post_style:
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result_segments = (
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cls(
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text,
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(
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None
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if control
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else (_style + post_style if _style else post_style)
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),
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control,
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)
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for text, _style, control in result_segments
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)
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return result_segments
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@classmethod
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def filter_control(
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cls, segments: Iterable["Segment"], is_control: bool = False
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) -> Iterable["Segment"]:
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"""Filter segments by ``is_control`` attribute.
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Args:
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segments (Iterable[Segment]): An iterable of Segment instances.
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is_control (bool, optional): is_control flag to match in search.
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Returns:
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Iterable[Segment]: And iterable of Segment instances.
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"""
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if is_control:
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return filter(attrgetter("control"), segments)
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else:
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return filterfalse(attrgetter("control"), segments)
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@classmethod
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def split_lines(cls, segments: Iterable["Segment"]) -> Iterable[List["Segment"]]:
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"""Split a sequence of segments in to a list of lines.
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Args:
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segments (Iterable[Segment]): Segments potentially containing line feeds.
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Yields:
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Iterable[List[Segment]]: Iterable of segment lists, one per line.
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"""
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line: List[Segment] = []
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append = line.append
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for segment in segments:
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if "\n" in segment.text and not segment.control:
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text, style, _ = segment
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while text:
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_text, new_line, text = text.partition("\n")
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if _text:
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append(cls(_text, style))
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if new_line:
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yield line
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line = []
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append = line.append
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else:
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append(segment)
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if line:
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yield line
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@classmethod
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def split_and_crop_lines(
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cls,
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segments: Iterable["Segment"],
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length: int,
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style: Optional[Style] = None,
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pad: bool = True,
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include_new_lines: bool = True,
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) -> Iterable[List["Segment"]]:
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"""Split segments in to lines, and crop lines greater than a given length.
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Args:
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segments (Iterable[Segment]): An iterable of segments, probably
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generated from console.render.
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length (int): Desired line length.
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style (Style, optional): Style to use for any padding.
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pad (bool): Enable padding of lines that are less than `length`.
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Returns:
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Iterable[List[Segment]]: An iterable of lines of segments.
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"""
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line: List[Segment] = []
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append = line.append
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adjust_line_length = cls.adjust_line_length
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new_line_segment = cls("\n")
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for segment in segments:
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if "\n" in segment.text and not segment.control:
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text, segment_style, _ = segment
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while text:
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_text, new_line, text = text.partition("\n")
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if _text:
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append(cls(_text, segment_style))
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if new_line:
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cropped_line = adjust_line_length(
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line, length, style=style, pad=pad
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)
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if include_new_lines:
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cropped_line.append(new_line_segment)
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yield cropped_line
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del line[:]
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else:
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append(segment)
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if line:
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yield adjust_line_length(line, length, style=style, pad=pad)
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@classmethod
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def adjust_line_length(
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cls,
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line: List["Segment"],
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length: int,
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style: Optional[Style] = None,
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pad: bool = True,
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) -> List["Segment"]:
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"""Adjust a line to a given width (cropping or padding as required).
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Args:
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segments (Iterable[Segment]): A list of segments in a single line.
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length (int): The desired width of the line.
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style (Style, optional): The style of padding if used (space on the end). Defaults to None.
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pad (bool, optional): Pad lines with spaces if they are shorter than `length`. Defaults to True.
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Returns:
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List[Segment]: A line of segments with the desired length.
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"""
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line_length = sum(segment.cell_length for segment in line)
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new_line: List[Segment]
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if line_length < length:
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if pad:
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new_line = line + [cls(" " * (length - line_length), style)]
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else:
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new_line = line[:]
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elif line_length > length:
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new_line = []
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append = new_line.append
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line_length = 0
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for segment in line:
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segment_length = segment.cell_length
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if line_length + segment_length < length or segment.control:
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append(segment)
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line_length += segment_length
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else:
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text, segment_style, _ = segment
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text = set_cell_size(text, length - line_length)
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append(cls(text, segment_style))
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break
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else:
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new_line = line[:]
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return new_line
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@classmethod
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def get_line_length(cls, line: List["Segment"]) -> int:
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"""Get the length of list of segments.
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Args:
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line (List[Segment]): A line encoded as a list of Segments (assumes no '\\\\n' characters),
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Returns:
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int: The length of the line.
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"""
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_cell_len = cell_len
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return sum(_cell_len(segment.text) for segment in line)
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@classmethod
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def get_shape(cls, lines: List[List["Segment"]]) -> Tuple[int, int]:
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"""Get the shape (enclosing rectangle) of a list of lines.
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Args:
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lines (List[List[Segment]]): A list of lines (no '\\\\n' characters).
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Returns:
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Tuple[int, int]: Width and height in characters.
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"""
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get_line_length = cls.get_line_length
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max_width = max(get_line_length(line) for line in lines) if lines else 0
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return (max_width, len(lines))
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@classmethod
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def set_shape(
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cls,
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lines: List[List["Segment"]],
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width: int,
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height: Optional[int] = None,
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style: Optional[Style] = None,
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new_lines: bool = False,
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) -> List[List["Segment"]]:
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"""Set the shape of a list of lines (enclosing rectangle).
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Args:
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lines (List[List[Segment]]): A list of lines.
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width (int): Desired width.
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height (int, optional): Desired height or None for no change.
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style (Style, optional): Style of any padding added.
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new_lines (bool, optional): Padded lines should include "\n". Defaults to False.
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Returns:
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List[List[Segment]]: New list of lines.
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"""
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_height = height or len(lines)
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blank = (
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[cls(" " * width + "\n", style)] if new_lines else [cls(" " * width, style)]
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)
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adjust_line_length = cls.adjust_line_length
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shaped_lines = lines[:_height]
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shaped_lines[:] = [
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adjust_line_length(line, width, style=style) for line in lines
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]
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if len(shaped_lines) < _height:
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shaped_lines.extend([blank] * (_height - len(shaped_lines)))
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return shaped_lines
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@classmethod
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def align_top(
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cls: Type["Segment"],
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lines: List[List["Segment"]],
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width: int,
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height: int,
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style: Style,
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new_lines: bool = False,
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) -> List[List["Segment"]]:
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"""Aligns lines to top (adds extra lines to bottom as required).
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Args:
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lines (List[List[Segment]]): A list of lines.
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width (int): Desired width.
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height (int, optional): Desired height or None for no change.
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style (Style): Style of any padding added.
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new_lines (bool, optional): Padded lines should include "\n". Defaults to False.
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Returns:
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List[List[Segment]]: New list of lines.
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"""
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extra_lines = height - len(lines)
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if not extra_lines:
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return lines[:]
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lines = lines[:height]
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blank = cls(" " * width + "\n", style) if new_lines else cls(" " * width, style)
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lines = lines + [[blank]] * extra_lines
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return lines
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@classmethod
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def align_bottom(
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cls: Type["Segment"],
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lines: List[List["Segment"]],
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width: int,
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height: int,
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style: Style,
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new_lines: bool = False,
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) -> List[List["Segment"]]:
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"""Aligns render to bottom (adds extra lines above as required).
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Args:
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lines (List[List[Segment]]): A list of lines.
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width (int): Desired width.
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height (int, optional): Desired height or None for no change.
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style (Style): Style of any padding added. Defaults to None.
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new_lines (bool, optional): Padded lines should include "\n". Defaults to False.
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Returns:
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List[List[Segment]]: New list of lines.
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"""
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extra_lines = height - len(lines)
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if not extra_lines:
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return lines[:]
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lines = lines[:height]
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blank = cls(" " * width + "\n", style) if new_lines else cls(" " * width, style)
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lines = [[blank]] * extra_lines + lines
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return lines
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@classmethod
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def align_middle(
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cls: Type["Segment"],
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lines: List[List["Segment"]],
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width: int,
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height: int,
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style: Style,
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new_lines: bool = False,
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) -> List[List["Segment"]]:
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"""Aligns lines to middle (adds extra lines to above and below as required).
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Args:
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lines (List[List[Segment]]): A list of lines.
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width (int): Desired width.
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height (int, optional): Desired height or None for no change.
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style (Style): Style of any padding added.
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new_lines (bool, optional): Padded lines should include "\n". Defaults to False.
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Returns:
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List[List[Segment]]: New list of lines.
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"""
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extra_lines = height - len(lines)
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if not extra_lines:
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return lines[:]
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lines = lines[:height]
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blank = cls(" " * width + "\n", style) if new_lines else cls(" " * width, style)
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top_lines = extra_lines // 2
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bottom_lines = extra_lines - top_lines
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lines = [[blank]] * top_lines + lines + [[blank]] * bottom_lines
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return lines
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@classmethod
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def simplify(cls, segments: Iterable["Segment"]) -> Iterable["Segment"]:
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"""Simplify an iterable of segments by combining contiguous segments with the same style.
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Args:
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segments (Iterable[Segment]): An iterable of segments.
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Returns:
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Iterable[Segment]: A possibly smaller iterable of segments that will render the same way.
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"""
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iter_segments = iter(segments)
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try:
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last_segment = next(iter_segments)
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except StopIteration:
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return
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_Segment = Segment
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for segment in iter_segments:
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if last_segment.style == segment.style and not segment.control:
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last_segment = _Segment(
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last_segment.text + segment.text, last_segment.style
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)
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else:
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yield last_segment
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last_segment = segment
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yield last_segment
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@classmethod
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def strip_links(cls, segments: Iterable["Segment"]) -> Iterable["Segment"]:
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"""Remove all links from an iterable of styles.
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Args:
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segments (Iterable[Segment]): An iterable segments.
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Yields:
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Segment: Segments with link removed.
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"""
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for segment in segments:
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if segment.control or segment.style is None:
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yield segment
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else:
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text, style, _control = segment
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yield cls(text, style.update_link(None) if style else None)
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@classmethod
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def strip_styles(cls, segments: Iterable["Segment"]) -> Iterable["Segment"]:
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"""Remove all styles from an iterable of segments.
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Args:
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segments (Iterable[Segment]): An iterable segments.
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Yields:
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Segment: Segments with styles replace with None
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"""
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|
for text, _style, control in segments:
|
|
yield cls(text, None, control)
|
|
|
|
@classmethod
|
|
def remove_color(cls, segments: Iterable["Segment"]) -> Iterable["Segment"]:
|
|
"""Remove all color from an iterable of segments.
|
|
|
|
Args:
|
|
segments (Iterable[Segment]): An iterable segments.
|
|
|
|
Yields:
|
|
Segment: Segments with colorless style.
|
|
"""
|
|
|
|
cache: Dict[Style, Style] = {}
|
|
for text, style, control in segments:
|
|
if style:
|
|
colorless_style = cache.get(style)
|
|
if colorless_style is None:
|
|
colorless_style = style.without_color
|
|
cache[style] = colorless_style
|
|
yield cls(text, colorless_style, control)
|
|
else:
|
|
yield cls(text, None, control)
|
|
|
|
@classmethod
|
|
def divide(
|
|
cls, segments: Iterable["Segment"], cuts: Iterable[int]
|
|
) -> Iterable[List["Segment"]]:
|
|
"""Divides an iterable of segments in to portions.
|
|
|
|
Args:
|
|
cuts (Iterable[int]): Cell positions where to divide.
|
|
|
|
Yields:
|
|
[Iterable[List[Segment]]]: An iterable of Segments in List.
|
|
"""
|
|
split_segments: List["Segment"] = []
|
|
add_segment = split_segments.append
|
|
|
|
iter_cuts = iter(cuts)
|
|
|
|
while True:
|
|
cut = next(iter_cuts, -1)
|
|
if cut == -1:
|
|
return []
|
|
if cut != 0:
|
|
break
|
|
yield []
|
|
pos = 0
|
|
|
|
segments_clear = split_segments.clear
|
|
segments_copy = split_segments.copy
|
|
|
|
_cell_len = cached_cell_len
|
|
for segment in segments:
|
|
text, _style, control = segment
|
|
while text:
|
|
end_pos = pos if control else pos + _cell_len(text)
|
|
if end_pos < cut:
|
|
add_segment(segment)
|
|
pos = end_pos
|
|
break
|
|
|
|
if end_pos == cut:
|
|
add_segment(segment)
|
|
yield segments_copy()
|
|
segments_clear()
|
|
pos = end_pos
|
|
|
|
cut = next(iter_cuts, -1)
|
|
if cut == -1:
|
|
if split_segments:
|
|
yield segments_copy()
|
|
return
|
|
|
|
break
|
|
|
|
else:
|
|
before, segment = segment.split_cells(cut - pos)
|
|
text, _style, control = segment
|
|
add_segment(before)
|
|
yield segments_copy()
|
|
segments_clear()
|
|
pos = cut
|
|
|
|
cut = next(iter_cuts, -1)
|
|
if cut == -1:
|
|
if split_segments:
|
|
yield segments_copy()
|
|
return
|
|
|
|
yield segments_copy()
|
|
|
|
|
|
class Segments:
|
|
"""A simple renderable to render an iterable of segments. This class may be useful if
|
|
you want to print segments outside of a __rich_console__ method.
|
|
|
|
Args:
|
|
segments (Iterable[Segment]): An iterable of segments.
|
|
new_lines (bool, optional): Add new lines between segments. Defaults to False.
|
|
"""
|
|
|
|
def __init__(self, segments: Iterable[Segment], new_lines: bool = False) -> None:
|
|
self.segments = list(segments)
|
|
self.new_lines = new_lines
|
|
|
|
def __rich_console__(
|
|
self, console: "Console", options: "ConsoleOptions"
|
|
) -> "RenderResult":
|
|
if self.new_lines:
|
|
line = Segment.line()
|
|
for segment in self.segments:
|
|
yield segment
|
|
yield line
|
|
else:
|
|
yield from self.segments
|
|
|
|
|
|
class SegmentLines:
|
|
def __init__(self, lines: Iterable[List[Segment]], new_lines: bool = False) -> None:
|
|
"""A simple renderable containing a number of lines of segments. May be used as an intermediate
|
|
in rendering process.
|
|
|
|
Args:
|
|
lines (Iterable[List[Segment]]): Lists of segments forming lines.
|
|
new_lines (bool, optional): Insert new lines after each line. Defaults to False.
|
|
"""
|
|
self.lines = list(lines)
|
|
self.new_lines = new_lines
|
|
|
|
def __rich_console__(
|
|
self, console: "Console", options: "ConsoleOptions"
|
|
) -> "RenderResult":
|
|
if self.new_lines:
|
|
new_line = Segment.line()
|
|
for line in self.lines:
|
|
yield from line
|
|
yield new_line
|
|
else:
|
|
for line in self.lines:
|
|
yield from line
|
|
|
|
|
|
if __name__ == "__main__": # pragma: no cover
|
|
from rich.console import Console
|
|
from rich.syntax import Syntax
|
|
from rich.text import Text
|
|
|
|
code = """from rich.console import Console
|
|
console = Console()
|
|
text = Text.from_markup("Hello, [bold magenta]World[/]!")
|
|
console.print(text)"""
|
|
|
|
text = Text.from_markup("Hello, [bold magenta]World[/]!")
|
|
|
|
console = Console()
|
|
|
|
console.rule("rich.Segment")
|
|
console.print(
|
|
"A Segment is the last step in the Rich render process before generating text with ANSI codes."
|
|
)
|
|
console.print("\nConsider the following code:\n")
|
|
console.print(Syntax(code, "python", line_numbers=True))
|
|
console.print()
|
|
console.print(
|
|
"When you call [b]print()[/b], Rich [i]renders[/i] the object in to the the following:\n"
|
|
)
|
|
fragments = list(console.render(text))
|
|
console.print(fragments)
|
|
console.print()
|
|
console.print("The Segments are then processed to produce the following output:\n")
|
|
console.print(text)
|
|
console.print(
|
|
"\nYou will only need to know this if you are implementing your own Rich renderables."
|
|
)
|