| from __future__ import annotations |
|
|
| from typing import Iterable, TYPE_CHECKING |
| from .model import CombinatorType, Selector, SelectorSet |
|
|
|
|
| if TYPE_CHECKING: |
| from ..dom import DOMNode |
|
|
|
|
| def match(selector_sets: Iterable[SelectorSet], node: DOMNode) -> bool: |
| """Check if a given selector matches any of the given selector sets. |
| |
| Args: |
| selector_sets (Iterable[SelectorSet]): Iterable of selector sets. |
| node (DOMNode): DOM node. |
| |
| Returns: |
| bool: True if the node matches the selector, otherwise False. |
| """ |
| return any( |
| _check_selectors(selector_set.selectors, node.css_path_nodes) |
| for selector_set in selector_sets |
| ) |
|
|
|
|
| def _check_selectors(selectors: list[Selector], css_path_nodes: list[DOMNode]) -> bool: |
| """Match a list of selectors against a node. |
| |
| Args: |
| selectors (list[Selector]): A list of selectors. |
| node (DOMNode): A DOM node. |
| |
| Returns: |
| bool: True if the node matches the selector. |
| """ |
|
|
| DESCENDENT = CombinatorType.DESCENDENT |
|
|
| node = css_path_nodes[-1] |
| path_count = len(css_path_nodes) |
| selector_count = len(selectors) |
|
|
| stack: list[tuple[int, int]] = [(0, 0)] |
|
|
| push = stack.append |
| pop = stack.pop |
| selector_index = 0 |
|
|
| while stack: |
| selector_index, node_index = stack[-1] |
| if selector_index == selector_count or node_index == path_count: |
| pop() |
| else: |
| path_node = css_path_nodes[node_index] |
| selector = selectors[selector_index] |
| if selector.combinator == DESCENDENT: |
| |
| if selector.check(path_node): |
| if path_node is node and selector_index == selector_count - 1: |
| return True |
| stack[-1] = (selector_index + 1, node_index + selector.advance) |
| push((selector_index, node_index + 1)) |
| else: |
| stack[-1] = (selector_index, node_index + 1) |
| else: |
| |
| if selector.check(path_node): |
| if path_node is node and selector_index == selector_count - 1: |
| return True |
| stack[-1] = (selector_index + 1, node_index + selector.advance) |
| else: |
| pop() |
| return False |
|
|
