772 lines
26 KiB
Python
772 lines
26 KiB
Python
import sys
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from functools import lru_cache
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from marshal import dumps, loads
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from random import randint
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from typing import Any, Dict, Iterable, List, Optional, Type, Union, cast
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from . import errors
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from .color import Color, ColorParseError, ColorSystem, blend_rgb
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from .repr import Result, rich_repr
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from .terminal_theme import DEFAULT_TERMINAL_THEME, TerminalTheme
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# Style instances and style definitions are often interchangeable
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StyleType = Union[str, "Style"]
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class _Bit:
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"""A descriptor to get/set a style attribute bit."""
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__slots__ = ["bit"]
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def __init__(self, bit_no: int) -> None:
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self.bit = 1 << bit_no
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def __get__(self, obj: "Style", objtype: Type["Style"]) -> Optional[bool]:
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if obj._set_attributes & self.bit:
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return obj._attributes & self.bit != 0
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return None
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@rich_repr
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class Style:
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"""A terminal style.
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A terminal style consists of a color (`color`), a background color (`bgcolor`), and a number of attributes, such
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as bold, italic etc. The attributes have 3 states: they can either be on
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(``True``), off (``False``), or not set (``None``).
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Args:
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color (Union[Color, str], optional): Color of terminal text. Defaults to None.
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bgcolor (Union[Color, str], optional): Color of terminal background. Defaults to None.
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bold (bool, optional): Enable bold text. Defaults to None.
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dim (bool, optional): Enable dim text. Defaults to None.
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italic (bool, optional): Enable italic text. Defaults to None.
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underline (bool, optional): Enable underlined text. Defaults to None.
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blink (bool, optional): Enabled blinking text. Defaults to None.
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blink2 (bool, optional): Enable fast blinking text. Defaults to None.
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reverse (bool, optional): Enabled reverse text. Defaults to None.
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conceal (bool, optional): Enable concealed text. Defaults to None.
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strike (bool, optional): Enable strikethrough text. Defaults to None.
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underline2 (bool, optional): Enable doubly underlined text. Defaults to None.
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frame (bool, optional): Enable framed text. Defaults to None.
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encircle (bool, optional): Enable encircled text. Defaults to None.
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overline (bool, optional): Enable overlined text. Defaults to None.
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link (str, link): Link URL. Defaults to None.
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"""
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_color: Optional[Color]
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_bgcolor: Optional[Color]
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_attributes: int
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_set_attributes: int
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_hash: Optional[int]
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_null: bool
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_meta: Optional[bytes]
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__slots__ = [
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"_color",
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"_bgcolor",
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"_attributes",
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"_set_attributes",
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"_link",
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"_link_id",
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"_ansi",
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"_style_definition",
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"_hash",
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"_null",
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"_meta",
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]
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# maps bits on to SGR parameter
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_style_map = {
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0: "1",
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1: "2",
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2: "3",
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3: "4",
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4: "5",
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5: "6",
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6: "7",
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7: "8",
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8: "9",
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9: "21",
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10: "51",
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11: "52",
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12: "53",
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}
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STYLE_ATTRIBUTES = {
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"dim": "dim",
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"d": "dim",
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"bold": "bold",
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"b": "bold",
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"italic": "italic",
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"i": "italic",
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"underline": "underline",
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"u": "underline",
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"blink": "blink",
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"blink2": "blink2",
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"reverse": "reverse",
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"r": "reverse",
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"conceal": "conceal",
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"c": "conceal",
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"strike": "strike",
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"s": "strike",
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"underline2": "underline2",
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"uu": "underline2",
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"frame": "frame",
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"encircle": "encircle",
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"overline": "overline",
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"o": "overline",
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}
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def __init__(
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self,
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*,
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color: Optional[Union[Color, str]] = None,
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bgcolor: Optional[Union[Color, str]] = None,
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bold: Optional[bool] = None,
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dim: Optional[bool] = None,
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italic: Optional[bool] = None,
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underline: Optional[bool] = None,
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blink: Optional[bool] = None,
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blink2: Optional[bool] = None,
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reverse: Optional[bool] = None,
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conceal: Optional[bool] = None,
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strike: Optional[bool] = None,
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underline2: Optional[bool] = None,
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frame: Optional[bool] = None,
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encircle: Optional[bool] = None,
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overline: Optional[bool] = None,
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link: Optional[str] = None,
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meta: Optional[Dict[str, Any]] = None,
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):
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self._ansi: Optional[str] = None
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self._style_definition: Optional[str] = None
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def _make_color(color: Union[Color, str]) -> Color:
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return color if isinstance(color, Color) else Color.parse(color)
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self._color = None if color is None else _make_color(color)
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self._bgcolor = None if bgcolor is None else _make_color(bgcolor)
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self._set_attributes = sum(
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(
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bold is not None,
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dim is not None and 2,
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italic is not None and 4,
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underline is not None and 8,
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blink is not None and 16,
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blink2 is not None and 32,
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reverse is not None and 64,
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conceal is not None and 128,
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strike is not None and 256,
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underline2 is not None and 512,
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frame is not None and 1024,
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encircle is not None and 2048,
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overline is not None and 4096,
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)
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)
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self._attributes = (
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sum(
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(
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bold and 1 or 0,
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dim and 2 or 0,
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italic and 4 or 0,
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underline and 8 or 0,
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blink and 16 or 0,
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blink2 and 32 or 0,
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reverse and 64 or 0,
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conceal and 128 or 0,
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strike and 256 or 0,
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underline2 and 512 or 0,
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frame and 1024 or 0,
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encircle and 2048 or 0,
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overline and 4096 or 0,
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)
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)
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if self._set_attributes
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else 0
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)
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self._link = link
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self._link_id = f"{randint(0, 999999)}" if link else ""
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self._meta = None if meta is None else dumps(meta)
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self._hash: Optional[int] = None
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self._null = not (self._set_attributes or color or bgcolor or link or meta)
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@classmethod
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def null(cls) -> "Style":
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"""Create an 'null' style, equivalent to Style(), but more performant."""
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return NULL_STYLE
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@classmethod
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def from_color(
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cls, color: Optional[Color] = None, bgcolor: Optional[Color] = None
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) -> "Style":
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"""Create a new style with colors and no attributes.
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Returns:
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color (Optional[Color]): A (foreground) color, or None for no color. Defaults to None.
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bgcolor (Optional[Color]): A (background) color, or None for no color. Defaults to None.
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"""
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style: Style = cls.__new__(Style)
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style._ansi = None
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style._style_definition = None
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style._color = color
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style._bgcolor = bgcolor
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style._set_attributes = 0
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style._attributes = 0
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style._link = None
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style._link_id = ""
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style._meta = None
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style._null = not (color or bgcolor)
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style._hash = None
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return style
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@classmethod
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def from_meta(cls, meta: Optional[Dict[str, Any]]) -> "Style":
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"""Create a new style with meta data.
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Returns:
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meta (Optional[Dict[str, Any]]): A dictionary of meta data. Defaults to None.
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"""
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style: Style = cls.__new__(Style)
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style._ansi = None
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style._style_definition = None
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style._color = None
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style._bgcolor = None
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style._set_attributes = 0
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style._attributes = 0
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style._link = None
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style._link_id = ""
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style._meta = dumps(meta)
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style._hash = None
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style._null = not (meta)
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return style
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@classmethod
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def on(cls, meta: Optional[Dict[str, Any]] = None, **handlers: Any) -> "Style":
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"""Create a blank style with meta information.
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Example:
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style = Style.on(click=self.on_click)
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Args:
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meta (Optional[Dict[str, Any]], optional): An optional dict of meta information.
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**handlers (Any): Keyword arguments are translated in to handlers.
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Returns:
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Style: A Style with meta information attached.
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"""
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meta = {} if meta is None else meta
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meta.update({f"@{key}": value for key, value in handlers.items()})
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return cls.from_meta(meta)
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bold = _Bit(0)
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dim = _Bit(1)
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italic = _Bit(2)
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underline = _Bit(3)
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blink = _Bit(4)
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blink2 = _Bit(5)
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reverse = _Bit(6)
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conceal = _Bit(7)
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strike = _Bit(8)
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underline2 = _Bit(9)
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frame = _Bit(10)
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encircle = _Bit(11)
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overline = _Bit(12)
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@property
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def link_id(self) -> str:
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"""Get a link id, used in ansi code for links."""
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return self._link_id
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def __str__(self) -> str:
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"""Re-generate style definition from attributes."""
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if self._style_definition is None:
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attributes: List[str] = []
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append = attributes.append
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bits = self._set_attributes
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if bits & 0b0000000001111:
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if bits & 1:
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append("bold" if self.bold else "not bold")
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if bits & (1 << 1):
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append("dim" if self.dim else "not dim")
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if bits & (1 << 2):
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append("italic" if self.italic else "not italic")
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if bits & (1 << 3):
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append("underline" if self.underline else "not underline")
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if bits & 0b0000111110000:
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if bits & (1 << 4):
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append("blink" if self.blink else "not blink")
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if bits & (1 << 5):
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append("blink2" if self.blink2 else "not blink2")
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if bits & (1 << 6):
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append("reverse" if self.reverse else "not reverse")
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if bits & (1 << 7):
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append("conceal" if self.conceal else "not conceal")
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if bits & (1 << 8):
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append("strike" if self.strike else "not strike")
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if bits & 0b1111000000000:
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if bits & (1 << 9):
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append("underline2" if self.underline2 else "not underline2")
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if bits & (1 << 10):
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append("frame" if self.frame else "not frame")
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if bits & (1 << 11):
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append("encircle" if self.encircle else "not encircle")
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if bits & (1 << 12):
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append("overline" if self.overline else "not overline")
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if self._color is not None:
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append(self._color.name)
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if self._bgcolor is not None:
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append("on")
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append(self._bgcolor.name)
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if self._link:
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append("link")
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append(self._link)
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self._style_definition = " ".join(attributes) or "none"
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return self._style_definition
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def __bool__(self) -> bool:
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"""A Style is false if it has no attributes, colors, or links."""
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return not self._null
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def _make_ansi_codes(self, color_system: ColorSystem) -> str:
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"""Generate ANSI codes for this style.
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Args:
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color_system (ColorSystem): Color system.
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Returns:
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str: String containing codes.
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"""
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if self._ansi is None:
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sgr: List[str] = []
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append = sgr.append
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_style_map = self._style_map
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attributes = self._attributes & self._set_attributes
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if attributes:
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if attributes & 1:
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append(_style_map[0])
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if attributes & 2:
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append(_style_map[1])
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if attributes & 4:
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append(_style_map[2])
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if attributes & 8:
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append(_style_map[3])
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if attributes & 0b0000111110000:
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for bit in range(4, 9):
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if attributes & (1 << bit):
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append(_style_map[bit])
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if attributes & 0b1111000000000:
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for bit in range(9, 13):
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if attributes & (1 << bit):
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append(_style_map[bit])
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if self._color is not None:
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sgr.extend(self._color.downgrade(color_system).get_ansi_codes())
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if self._bgcolor is not None:
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sgr.extend(
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self._bgcolor.downgrade(color_system).get_ansi_codes(
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foreground=False
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)
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)
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self._ansi = ";".join(sgr)
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return self._ansi
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@classmethod
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@lru_cache(maxsize=1024)
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def normalize(cls, style: str) -> str:
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"""Normalize a style definition so that styles with the same effect have the same string
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representation.
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Args:
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style (str): A style definition.
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Returns:
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str: Normal form of style definition.
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"""
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try:
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return str(cls.parse(style))
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except errors.StyleSyntaxError:
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return style.strip().lower()
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@classmethod
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def pick_first(cls, *values: Optional[StyleType]) -> StyleType:
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"""Pick first non-None style."""
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for value in values:
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if value is not None:
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return value
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raise ValueError("expected at least one non-None style")
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def __rich_repr__(self) -> Result:
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yield "color", self.color, None
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yield "bgcolor", self.bgcolor, None
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yield "bold", self.bold, None,
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yield "dim", self.dim, None,
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yield "italic", self.italic, None
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yield "underline", self.underline, None,
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yield "blink", self.blink, None
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yield "blink2", self.blink2, None
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yield "reverse", self.reverse, None
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yield "conceal", self.conceal, None
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yield "strike", self.strike, None
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yield "underline2", self.underline2, None
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yield "frame", self.frame, None
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yield "encircle", self.encircle, None
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yield "link", self.link, None
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if self._meta:
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yield "meta", self.meta
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def __eq__(self, other: Any) -> bool:
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if not isinstance(other, Style):
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return NotImplemented
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return self.__hash__() == other.__hash__()
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def __ne__(self, other: Any) -> bool:
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if not isinstance(other, Style):
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return NotImplemented
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return self.__hash__() != other.__hash__()
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def __hash__(self) -> int:
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if self._hash is not None:
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return self._hash
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self._hash = hash(
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(
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self._color,
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self._bgcolor,
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self._attributes,
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self._set_attributes,
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self._link,
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self._meta,
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)
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)
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return self._hash
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@property
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def color(self) -> Optional[Color]:
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"""The foreground color or None if it is not set."""
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return self._color
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@property
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def bgcolor(self) -> Optional[Color]:
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"""The background color or None if it is not set."""
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return self._bgcolor
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@property
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def link(self) -> Optional[str]:
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"""Link text, if set."""
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return self._link
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@property
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def transparent_background(self) -> bool:
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"""Check if the style specified a transparent background."""
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return self.bgcolor is None or self.bgcolor.is_default
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@property
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def background_style(self) -> "Style":
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"""A Style with background only."""
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return Style(bgcolor=self.bgcolor)
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@property
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def meta(self) -> Dict[str, Any]:
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"""Get meta information (can not be changed after construction)."""
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return {} if self._meta is None else cast(Dict[str, Any], loads(self._meta))
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@property
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def without_color(self) -> "Style":
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"""Get a copy of the style with color removed."""
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if self._null:
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return NULL_STYLE
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style: Style = self.__new__(Style)
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style._ansi = None
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style._style_definition = None
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style._color = None
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style._bgcolor = None
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style._attributes = self._attributes
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style._set_attributes = self._set_attributes
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style._link = self._link
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style._link_id = f"{randint(0, 999999)}" if self._link else ""
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style._null = False
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style._meta = None
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style._hash = None
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return style
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@classmethod
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@lru_cache(maxsize=4096)
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def parse(cls, style_definition: str) -> "Style":
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"""Parse a style definition.
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Args:
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style_definition (str): A string containing a style.
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Raises:
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errors.StyleSyntaxError: If the style definition syntax is invalid.
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Returns:
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`Style`: A Style instance.
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"""
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if style_definition.strip() == "none" or not style_definition:
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return cls.null()
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STYLE_ATTRIBUTES = cls.STYLE_ATTRIBUTES
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color: Optional[str] = None
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bgcolor: Optional[str] = None
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attributes: Dict[str, Optional[Any]] = {}
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link: Optional[str] = None
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words = iter(style_definition.split())
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for original_word in words:
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word = original_word.lower()
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if word == "on":
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word = next(words, "")
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if not word:
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raise errors.StyleSyntaxError("color expected after 'on'")
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try:
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Color.parse(word) is None
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except ColorParseError as error:
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raise errors.StyleSyntaxError(
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f"unable to parse {word!r} as background color; {error}"
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) from None
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bgcolor = word
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elif word == "not":
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word = next(words, "")
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attribute = STYLE_ATTRIBUTES.get(word)
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if attribute is None:
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raise errors.StyleSyntaxError(
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|
f"expected style attribute after 'not', found {word!r}"
|
|
)
|
|
attributes[attribute] = False
|
|
|
|
elif word == "link":
|
|
word = next(words, "")
|
|
if not word:
|
|
raise errors.StyleSyntaxError("URL expected after 'link'")
|
|
link = word
|
|
|
|
elif word in STYLE_ATTRIBUTES:
|
|
attributes[STYLE_ATTRIBUTES[word]] = True
|
|
|
|
else:
|
|
try:
|
|
Color.parse(word)
|
|
except ColorParseError as error:
|
|
raise errors.StyleSyntaxError(
|
|
f"unable to parse {word!r} as color; {error}"
|
|
) from None
|
|
color = word
|
|
style = Style(color=color, bgcolor=bgcolor, link=link, **attributes)
|
|
return style
|
|
|
|
@lru_cache(maxsize=1024)
|
|
def get_html_style(self, theme: Optional[TerminalTheme] = None) -> str:
|
|
"""Get a CSS style rule."""
|
|
theme = theme or DEFAULT_TERMINAL_THEME
|
|
css: List[str] = []
|
|
append = css.append
|
|
|
|
color = self.color
|
|
bgcolor = self.bgcolor
|
|
if self.reverse:
|
|
color, bgcolor = bgcolor, color
|
|
if self.dim:
|
|
foreground_color = (
|
|
theme.foreground_color if color is None else color.get_truecolor(theme)
|
|
)
|
|
color = Color.from_triplet(
|
|
blend_rgb(foreground_color, theme.background_color, 0.5)
|
|
)
|
|
if color is not None:
|
|
theme_color = color.get_truecolor(theme)
|
|
append(f"color: {theme_color.hex}")
|
|
append(f"text-decoration-color: {theme_color.hex}")
|
|
if bgcolor is not None:
|
|
theme_color = bgcolor.get_truecolor(theme, foreground=False)
|
|
append(f"background-color: {theme_color.hex}")
|
|
if self.bold:
|
|
append("font-weight: bold")
|
|
if self.italic:
|
|
append("font-style: italic")
|
|
if self.underline:
|
|
append("text-decoration: underline")
|
|
if self.strike:
|
|
append("text-decoration: line-through")
|
|
if self.overline:
|
|
append("text-decoration: overline")
|
|
return "; ".join(css)
|
|
|
|
@classmethod
|
|
def combine(cls, styles: Iterable["Style"]) -> "Style":
|
|
"""Combine styles and get result.
|
|
|
|
Args:
|
|
styles (Iterable[Style]): Styles to combine.
|
|
|
|
Returns:
|
|
Style: A new style instance.
|
|
"""
|
|
iter_styles = iter(styles)
|
|
return sum(iter_styles, next(iter_styles))
|
|
|
|
@classmethod
|
|
def chain(cls, *styles: "Style") -> "Style":
|
|
"""Combine styles from positional argument in to a single style.
|
|
|
|
Args:
|
|
*styles (Iterable[Style]): Styles to combine.
|
|
|
|
Returns:
|
|
Style: A new style instance.
|
|
"""
|
|
iter_styles = iter(styles)
|
|
return sum(iter_styles, next(iter_styles))
|
|
|
|
def copy(self) -> "Style":
|
|
"""Get a copy of this style.
|
|
|
|
Returns:
|
|
Style: A new Style instance with identical attributes.
|
|
"""
|
|
if self._null:
|
|
return NULL_STYLE
|
|
style: Style = self.__new__(Style)
|
|
style._ansi = self._ansi
|
|
style._style_definition = self._style_definition
|
|
style._color = self._color
|
|
style._bgcolor = self._bgcolor
|
|
style._attributes = self._attributes
|
|
style._set_attributes = self._set_attributes
|
|
style._link = self._link
|
|
style._link_id = f"{randint(0, 999999)}" if self._link else ""
|
|
style._hash = self._hash
|
|
style._null = False
|
|
style._meta = self._meta
|
|
return style
|
|
|
|
def update_link(self, link: Optional[str] = None) -> "Style":
|
|
"""Get a copy with a different value for link.
|
|
|
|
Args:
|
|
link (str, optional): New value for link. Defaults to None.
|
|
|
|
Returns:
|
|
Style: A new Style instance.
|
|
"""
|
|
style: Style = self.__new__(Style)
|
|
style._ansi = self._ansi
|
|
style._style_definition = self._style_definition
|
|
style._color = self._color
|
|
style._bgcolor = self._bgcolor
|
|
style._attributes = self._attributes
|
|
style._set_attributes = self._set_attributes
|
|
style._link = link
|
|
style._link_id = f"{randint(0, 999999)}" if link else ""
|
|
style._hash = None
|
|
style._null = False
|
|
style._meta = self._meta
|
|
return style
|
|
|
|
def render(
|
|
self,
|
|
text: str = "",
|
|
*,
|
|
color_system: Optional[ColorSystem] = ColorSystem.TRUECOLOR,
|
|
legacy_windows: bool = False,
|
|
) -> str:
|
|
"""Render the ANSI codes for the style.
|
|
|
|
Args:
|
|
text (str, optional): A string to style. Defaults to "".
|
|
color_system (Optional[ColorSystem], optional): Color system to render to. Defaults to ColorSystem.TRUECOLOR.
|
|
|
|
Returns:
|
|
str: A string containing ANSI style codes.
|
|
"""
|
|
if not text or color_system is None:
|
|
return text
|
|
attrs = self._ansi or self._make_ansi_codes(color_system)
|
|
rendered = f"\x1b[{attrs}m{text}\x1b[0m" if attrs else text
|
|
if self._link and not legacy_windows:
|
|
rendered = (
|
|
f"\x1b]8;id={self._link_id};{self._link}\x1b\\{rendered}\x1b]8;;\x1b\\"
|
|
)
|
|
return rendered
|
|
|
|
def test(self, text: Optional[str] = None) -> None:
|
|
"""Write text with style directly to terminal.
|
|
|
|
This method is for testing purposes only.
|
|
|
|
Args:
|
|
text (Optional[str], optional): Text to style or None for style name.
|
|
|
|
"""
|
|
text = text or str(self)
|
|
sys.stdout.write(f"{self.render(text)}\n")
|
|
|
|
@lru_cache(maxsize=1024)
|
|
def _add(self, style: Optional["Style"]) -> "Style":
|
|
if style is None or style._null:
|
|
return self
|
|
if self._null:
|
|
return style
|
|
new_style: Style = self.__new__(Style)
|
|
new_style._ansi = None
|
|
new_style._style_definition = None
|
|
new_style._color = style._color or self._color
|
|
new_style._bgcolor = style._bgcolor or self._bgcolor
|
|
new_style._attributes = (self._attributes & ~style._set_attributes) | (
|
|
style._attributes & style._set_attributes
|
|
)
|
|
new_style._set_attributes = self._set_attributes | style._set_attributes
|
|
new_style._link = style._link or self._link
|
|
new_style._link_id = style._link_id or self._link_id
|
|
new_style._null = style._null
|
|
if self._meta and style._meta:
|
|
new_style._meta = dumps({**self.meta, **style.meta})
|
|
else:
|
|
new_style._meta = self._meta or style._meta
|
|
new_style._hash = None
|
|
return new_style
|
|
|
|
def __add__(self, style: Optional["Style"]) -> "Style":
|
|
combined_style = self._add(style)
|
|
return combined_style.copy() if combined_style.link else combined_style
|
|
|
|
|
|
NULL_STYLE = Style()
|
|
|
|
|
|
class StyleStack:
|
|
"""A stack of styles."""
|
|
|
|
__slots__ = ["_stack"]
|
|
|
|
def __init__(self, default_style: "Style") -> None:
|
|
self._stack: List[Style] = [default_style]
|
|
|
|
def __repr__(self) -> str:
|
|
return f"<stylestack {self._stack!r}>"
|
|
|
|
@property
|
|
def current(self) -> Style:
|
|
"""Get the Style at the top of the stack."""
|
|
return self._stack[-1]
|
|
|
|
def push(self, style: Style) -> None:
|
|
"""Push a new style on to the stack.
|
|
|
|
Args:
|
|
style (Style): New style to combine with current style.
|
|
"""
|
|
self._stack.append(self._stack[-1] + style)
|
|
|
|
def pop(self) -> Style:
|
|
"""Pop last style and discard.
|
|
|
|
Returns:
|
|
Style: New current style (also available as stack.current)
|
|
"""
|
|
self._stack.pop()
|
|
return self._stack[-1]
|