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import { error } from '../../../errors.js';
import { is_keyframes_node } from '../../css.js';
import { merge } from '../../visitors.js';
/**
* @typedef {import('zimmerframe').Visitors<
* import('#compiler').Css.Node,
* {
* keyframes: string[];
* rule: import('#compiler').Css.Rule | null;
* }
* >} Visitors
*/
/** @param {import('#compiler').Css.RelativeSelector} relative_selector */
function is_global(relative_selector) {
const first = relative_selector.selectors[0];
return (
first.type === 'PseudoClassSelector' &&
first.name === 'global' &&
relative_selector.selectors.every(
(selector) =>
selector.type === 'PseudoClassSelector' || selector.type === 'PseudoElementSelector'
)
);
}
/** @type {Visitors} */
const analysis_visitors = {
Atrule(node, context) {
if (is_keyframes_node(node)) {
if (!node.prelude.startsWith('-global-')) {
context.state.keyframes.push(node.prelude);
}
}
},
ComplexSelector(node, context) {
context.next(); // analyse relevant selectors first
node.metadata.rule = context.state.rule;
node.metadata.used = node.children.every(
({ metadata }) => metadata.is_global || metadata.is_host || metadata.is_root
);
},
RelativeSelector(node, context) {
node.metadata.is_global =
node.selectors.length >= 1 &&
node.selectors[0].type === 'PseudoClassSelector' &&
node.selectors[0].name === 'global' &&
node.selectors.every(
(selector) =>
selector.type === 'PseudoClassSelector' || selector.type === 'PseudoElementSelector'
);
if (node.selectors.length === 1) {
const first = node.selectors[0];
node.metadata.is_host = first.type === 'PseudoClassSelector' && first.name === 'host';
}
node.metadata.is_root = !!node.selectors.find(
(child) => child.type === 'PseudoClassSelector' && child.name === 'root'
);
context.next();
},
Rule(node, context) {
node.metadata.parent_rule = context.state.rule;
context.next({
...context.state,
rule: node
});
node.metadata.has_local_selectors = node.prelude.children.some((selector) => {
return selector.children.some(
({ metadata }) => !metadata.is_global && !metadata.is_host && !metadata.is_root
);
});
}
};
/** @type {Visitors} */
const validation_visitors = {
ComplexSelector(node, context) {
// ensure `:global(...)` is not used in the middle of a selector
{
const a = node.children.findIndex((child) => !is_global(child));
const b = node.children.findLastIndex((child) => !is_global(child));
if (a !== b) {
for (let i = a; i <= b; i += 1) {
if (is_global(node.children[i])) {
error(node.children[i].selectors[0], 'invalid-css-global-placement');
}
}
}
}
// ensure `:global(...)` do not lead to invalid css after `:global()` is removed
for (const relative_selector of node.children) {
for (let i = 0; i < relative_selector.selectors.length; i++) {
const selector = relative_selector.selectors[i];
if (selector.type === 'PseudoClassSelector' && selector.name === 'global') {
const child = selector.args?.children[0].children[0];
// ensure `:global(element)` to be at the first position in a compound selector
if (child?.selectors[0].type === 'TypeSelector' && i !== 0) {
error(selector, 'invalid-css-global-selector-list');
}
// ensure `:global(.class)` is not followed by a type selector, eg: `:global(.class)element`
if (relative_selector.selectors[i + 1]?.type === 'TypeSelector') {
error(relative_selector.selectors[i + 1], 'invalid-css-type-selector-placement');
}
// ensure `:global(...)`contains a single selector
// (standalone :global() with multiple selectors is OK)
if (
selector.args !== null &&
selector.args.children.length > 1 &&
(node.children.length > 1 || relative_selector.selectors.length > 1)
) {
error(selector, 'invalid-css-global-selector');
}
}
}
}
},
NestingSelector(node, context) {
const rule = /** @type {import('#compiler').Css.Rule} */ (context.state.rule);
if (!rule.metadata.parent_rule) {
error(node, 'invalid-nesting-selector');
}
}
};
const css_visitors = merge(analysis_visitors, validation_visitors);
/**
* @param {import('#compiler').Css.StyleSheet} stylesheet
* @param {import('../../types.js').ComponentAnalysis} analysis
*/
export function analyze_css(stylesheet, analysis) {
walk(stylesheet, { keyframes: analysis.css.keyframes, rule: null }, css_visitors);
}
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