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import configparser
from typing import IO, Dict, List, Mapping, Optional
from .default_styles import DEFAULT_STYLES
from .style import Style, StyleType
class Theme:
"""A container for style information, used by :class:`~rich.console.Console`.
Args:
styles (Dict[str, Style], optional): A mapping of style names on to styles. Defaults to None for a theme with no styles.
inherit (bool, optional): Inherit default styles. Defaults to True.
"""
styles: Dict[str, Style]
def __init__(
self, styles: Optional[Mapping[str, StyleType]] = None, inherit: bool = True
):
self.styles = DEFAULT_STYLES.copy() if inherit else {}
if styles is not None:
self.styles.update(
{
name: style if isinstance(style, Style) else Style.parse(style)
for name, style in styles.items()
}
)
@property
def config(self) -> str:
"""Get contents of a config file for this theme."""
config = "[styles]\n" + "\n".join(
f"{name} = {style}" for name, style in sorted(self.styles.items())
)
return config
@classmethod
def from_file(
cls, config_file: IO[str], source: Optional[str] = None, inherit: bool = True
) -> "Theme":
"""Load a theme from a text mode file.
Args:
config_file (IO[str]): An open conf file.
source (str, optional): The filename of the open file. Defaults to None.
inherit (bool, optional): Inherit default styles. Defaults to True.
Returns:
Theme: A New theme instance.
"""
config = configparser.ConfigParser()
config.read_file(config_file, source=source)
styles = {name: Style.parse(value) for name, value in config.items("styles")}
theme = Theme(styles, inherit=inherit)
return theme
@classmethod
def read(
cls, path: str, inherit: bool = True, encoding: Optional[str] = None
) -> "Theme":
"""Read a theme from a path.
Args:
path (str): Path to a config file readable by Python configparser module.
inherit (bool, optional): Inherit default styles. Defaults to True.
encoding (str, optional): Encoding of the config file. Defaults to None.
Returns:
Theme: A new theme instance.
"""
with open(path, encoding=encoding) as config_file:
return cls.from_file(config_file, source=path, inherit=inherit)
class ThemeStackError(Exception):
"""Base exception for errors related to the theme stack."""
class ThemeStack:
"""A stack of themes.
Args:
theme (Theme): A theme instance
"""
def __init__(self, theme: Theme) -> None:
self._entries: List[Dict[str, Style]] = [theme.styles]
self.get = self._entries[-1].get
def push_theme(self, theme: Theme, inherit: bool = True) -> None:
"""Push a theme on the top of the stack.
Args:
theme (Theme): A Theme instance.
inherit (boolean, optional): Inherit styles from current top of stack.
"""
styles: Dict[str, Style]
styles = (
{**self._entries[-1], **theme.styles} if inherit else theme.styles.copy()
)
self._entries.append(styles)
self.get = self._entries[-1].get
def pop_theme(self) -> None:
"""Pop (and discard) the top-most theme."""
if len(self._entries) == 1:
raise ThemeStackError("Unable to pop base theme")
self._entries.pop()
self.get = self._entries[-1].get
if __name__ == "__main__": # pragma: no cover
theme = Theme()
print(theme.config)