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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.
40 lines
1.1 KiB
Python
40 lines
1.1 KiB
Python
from dataclasses import dataclass
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from enum import Enum
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from Utils.CSSGrammar.Parser.component_values import ComponentValue
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class GrammarNode:
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def dump(self, indent: int = 0) -> str:
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raise NotImplementedError
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# https://drafts.csswg.org/css-values-4/#component-types
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@dataclass(frozen=True)
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class ComponentValueGrammarNode(GrammarNode):
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component_value: ComponentValue
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def dump(self, indent: int = 0) -> str:
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return f"{'': >{indent}}ComponentValue\n" + self.component_value.dump(indent + 2)
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class CombinatorType(Enum):
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# https://drafts.csswg.org/css-values-4/#comb-one
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# A bar (|) separates two or more alternatives: exactly one of them must occur.
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ALTERNATIVES = "Alternatives"
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# https://drafts.csswg.org/css-values-4/#component-combinators
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@dataclass(frozen=True)
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class CombinatorGrammarNode(GrammarNode):
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combinator_type: CombinatorType
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children: list[GrammarNode]
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def dump(self, indent: int = 0) -> str:
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output = f"{'': >{indent}}Combinator({self.combinator_type.value}):\n"
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for child in self.children:
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output += child.dump(indent + 2)
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return output
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