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https://github.com/LadybirdBrowser/ladybird
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To do this we parse the grammar supplied in `ValueTypes.json` and generate the appropriate parsing function in `CSS::Parser::Parser` Only a small subset of the CSS grammar (i.e. types `<foo>` and alternatives `<foo> | <bar>`) is implemented so far, it will be expanded in later commits.
34 lines
926 B
Python
34 lines
926 B
Python
from dataclasses import dataclass
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from enum import Enum
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from typing import Self
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from Utils.CSSGrammar.Parser.component_values import ComponentValue
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class TokenType(Enum):
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END_OF_FILE = "end-of-file"
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SINGLE_BAR = "single-bar"
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COMPONENT_VALUE = "component-value"
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@dataclass(frozen=True)
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class Token:
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token_type: TokenType
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value: ComponentValue | None
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@classmethod
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def create(cls, token_type: TokenType) -> Self:
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return cls(token_type, None)
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@classmethod
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def create_component_value(cls, component_value: ComponentValue) -> Self:
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return cls(TokenType.COMPONENT_VALUE, component_value)
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def is_token_type(self, token_type: TokenType) -> bool:
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return self.token_type == token_type
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def component_value(self) -> ComponentValue:
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assert self.token_type == TokenType.COMPONENT_VALUE and isinstance(self.value, ComponentValue)
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return self.value
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