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"""
The base classes for the styling.
"""
from abc import ABCMeta, abstractmethod, abstractproperty
from typing import Callable, Dict, Hashable, List, NamedTuple, Optional, Tuple
__all__ = [
"Attrs",
"DEFAULT_ATTRS",
"ANSI_COLOR_NAMES",
"ANSI_COLOR_NAMES_ALIASES",
"BaseStyle",
"DummyStyle",
"DynamicStyle",
]
#: Style attributes.
class Attrs(NamedTuple):
color: Optional[str]
bgcolor: Optional[str]
bold: Optional[bool]
underline: Optional[bool]
strike: Optional[bool]
italic: Optional[bool]
blink: Optional[bool]
reverse: Optional[bool]
hidden: Optional[bool]
"""
:param color: Hexadecimal string. E.g. '000000' or Ansi color name: e.g. 'ansiblue'
:param bgcolor: Hexadecimal string. E.g. 'ffffff' or Ansi color name: e.g. 'ansired'
:param bold: Boolean
:param underline: Boolean
:param strike: Boolean
:param italic: Boolean
:param blink: Boolean
:param reverse: Boolean
:param hidden: Boolean
"""
#: The default `Attrs`.
DEFAULT_ATTRS = Attrs(
color="",
bgcolor="",
bold=False,
underline=False,
strike=False,
italic=False,
blink=False,
reverse=False,
hidden=False,
)
#: ``Attrs.bgcolor/fgcolor`` can be in either 'ffffff' format, or can be any of
#: the following in case we want to take colors from the 8/16 color palette.
#: Usually, in that case, the terminal application allows to configure the RGB
#: values for these names.
#: ISO 6429 colors
ANSI_COLOR_NAMES = [
"ansidefault",
# Low intensity, dark. (One or two components 0x80, the other 0x00.)
"ansiblack",
"ansired",
"ansigreen",
"ansiyellow",
"ansiblue",
"ansimagenta",
"ansicyan",
"ansigray",
# High intensity, bright. (One or two components 0xff, the other 0x00. Not supported everywhere.)
"ansibrightblack",
"ansibrightred",
"ansibrightgreen",
"ansibrightyellow",
"ansibrightblue",
"ansibrightmagenta",
"ansibrightcyan",
"ansiwhite",
]
# People don't use the same ANSI color names everywhere. In prompt_toolkit 1.0
# we used some unconventional names (which were contributed like that to
# Pygments). This is fixed now, but we still support the old names.
# The table below maps the old aliases to the current names.
ANSI_COLOR_NAMES_ALIASES: Dict[str, str] = {
"ansidarkgray": "ansibrightblack",
"ansiteal": "ansicyan",
"ansiturquoise": "ansibrightcyan",
"ansibrown": "ansiyellow",
"ansipurple": "ansimagenta",
"ansifuchsia": "ansibrightmagenta",
"ansilightgray": "ansigray",
"ansidarkred": "ansired",
"ansidarkgreen": "ansigreen",
"ansidarkblue": "ansiblue",
}
assert set(ANSI_COLOR_NAMES_ALIASES.values()).issubset(set(ANSI_COLOR_NAMES))
assert not (set(ANSI_COLOR_NAMES_ALIASES.keys()) & set(ANSI_COLOR_NAMES))
class BaseStyle(metaclass=ABCMeta):
"""
Abstract base class for prompt_toolkit styles.
"""
@abstractmethod
def get_attrs_for_style_str(
self, style_str: str, default: Attrs = DEFAULT_ATTRS
) -> Attrs:
"""
Return :class:`.Attrs` for the given style string.
:param style_str: The style string. This can contain inline styling as
well as classnames (e.g. "class:title").
:param default: `Attrs` to be used if no styling was defined.
"""
@abstractproperty
def style_rules(self) -> List[Tuple[str, str]]:
"""
The list of style rules, used to create this style.
(Required for `DynamicStyle` and `_MergedStyle` to work.)
"""
return []
@abstractmethod
def invalidation_hash(self) -> Hashable:
"""
Invalidation hash for the style. When this changes over time, the
renderer knows that something in the style changed, and that everything
has to be redrawn.
"""
class DummyStyle(BaseStyle):
"""
A style that doesn't style anything.
"""
def get_attrs_for_style_str(
self, style_str: str, default: Attrs = DEFAULT_ATTRS
) -> Attrs:
return default
def invalidation_hash(self) -> Hashable:
return 1 # Always the same value.
@property
def style_rules(self) -> List[Tuple[str, str]]:
return []
class DynamicStyle(BaseStyle):
"""
Style class that can dynamically returns an other Style.
:param get_style: Callable that returns a :class:`.Style` instance.
"""
def __init__(self, get_style: Callable[[], Optional[BaseStyle]]):
self.get_style = get_style
self._dummy = DummyStyle()
def get_attrs_for_style_str(
self, style_str: str, default: Attrs = DEFAULT_ATTRS
) -> Attrs:
style = self.get_style() or self._dummy
return style.get_attrs_for_style_str(style_str, default)
def invalidation_hash(self) -> Hashable:
return (self.get_style() or self._dummy).invalidation_hash()
@property
def style_rules(self) -> List[Tuple[str, str]]:
return (self.get_style() or self._dummy).style_rules
|
