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