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/** @import { Css } from '#compiler' */
/** @import { Visitors } from 'zimmerframe' */
import { walk } from 'zimmerframe';
import * as e from '../../../errors.js';
import { is_keyframes_node } from '../../css.js';
import { merge } from '../../visitors.js';
/**
* @typedef {Visitors<
* Css.Node,
* {
* keyframes: string[];
* rule: Css.Rule | null;
* }
* >} CssVisitors
*/
/**
* True if is `:global(...)` or `:global`
* @param {Css.RelativeSelector} relative_selector
* @returns {relative_selector is Css.RelativeSelector & { selectors: [Css.PseudoClassSelector, ...Array<Css.PseudoClassSelector | Css.PseudoElementSelector>] }}
*/
function is_global(relative_selector) {
const first = relative_selector.selectors[0];
return (
first.type === 'PseudoClassSelector' &&
first.name === 'global' &&
(first.args === null ||
// Only these two selector types keep the whole selector global, because e.g.
// :global(button).x means that the selector is still scoped because of the .x
relative_selector.selectors.every(
(selector) =>
selector.type === 'PseudoClassSelector' || selector.type === 'PseudoElementSelector'
))
);
}
/**
* True if is `:global`
* @param {Css.SimpleSelector} simple_selector
*/
function is_global_block_selector(simple_selector) {
return (
simple_selector.type === 'PseudoClassSelector' &&
simple_selector.name === 'global' &&
simple_selector.args === null
);
}
/** @type {CssVisitors} */
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_global_like
);
},
RelativeSelector(node, context) {
node.metadata.is_global = node.selectors.length >= 1 && is_global(node);
if (node.selectors.length === 1) {
const first = node.selectors[0];
node.metadata.is_global_like ||=
(first.type === 'PseudoClassSelector' && first.name === 'host') ||
(first.type === 'PseudoElementSelector' &&
[
'view-transition',
'view-transition-group',
'view-transition-old',
'view-transition-new',
'view-transition-image-pair'
].includes(first.name));
}
node.metadata.is_global_like ||= !!node.selectors.find(
(child) => child.type === 'PseudoClassSelector' && child.name === 'root'
);
context.next();
},
Rule(node, context) {
node.metadata.parent_rule = context.state.rule;
node.metadata.is_global_block = node.prelude.children.some((selector) => {
let is_global_block = false;
for (const child of selector.children) {
const idx = child.selectors.findIndex(is_global_block_selector);
if (is_global_block) {
// All selectors after :global are unscoped
child.metadata.is_global_like = true;
}
if (idx !== -1) {
is_global_block = true;
for (let i = idx + 1; i < child.selectors.length; i++) {
walk(/** @type {Css.Node} */ (child.selectors[i]), null, {
ComplexSelector(node) {
node.metadata.used = true;
}
});
}
}
}
return is_global_block;
});
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_global_like
);
});
}
};
/** @type {CssVisitors} */
const validation_visitors = {
Rule(node, context) {
if (node.metadata.is_global_block) {
if (node.prelude.children.length > 1) {
e.css_global_block_invalid_list(node.prelude);
}
const complex_selector = node.prelude.children[0];
const global_selector = complex_selector.children.find((r) => {
return r.selectors.some(is_global_block_selector);
});
if (!global_selector) {
throw new Error('Internal error: global block without :global selector');
}
const global_block_selector_idx =
global_selector.selectors.findIndex(is_global_block_selector);
const starts_with_nesting_selector =
complex_selector.children[0].selectors.length === 1 &&
complex_selector.children[0].selectors[0].type === 'NestingSelector';
if (
(!global_selector.combinator &&
global_selector.selectors.length > 1 &&
(global_block_selector_idx === 0 ||
(global_block_selector_idx === 1 && starts_with_nesting_selector))) ||
(global_selector.combinator?.name === ' ' && starts_with_nesting_selector)
) {
// div { :global.x { ... } } desugars to div :global.x { ... } which results in div.svelte-hash.x { ... }
// but it would be very hard to code-mod that and certainly doesn't look like it to the user,
// therefore we make this an error
e.css_global_block_invalid_placement(global_selector);
}
if (
global_selector.combinator &&
// p :global {...} or p > :global.x {...} is valid
global_selector.combinator.name !== ' ' &&
global_selector.selectors.length === 1
) {
const next =
complex_selector.children[complex_selector.children.indexOf(global_selector) + 1];
// p > :global div {...} is valid, but p > :global > div {...} or p > :global {...} is not
if (!next || next.combinator?.name !== ' ') {
e.css_global_block_invalid_combinator(global_selector, global_selector.combinator.name);
}
}
const declaration = node.block.children.find((child) => child.type === 'Declaration');
if (
declaration &&
// :global { color: red; } is invalid, but foo :global { color: red; } is valid
node.prelude.children.length === 1 &&
node.prelude.children[0].children.length === 1 &&
node.prelude.children[0].children[0].selectors.length === 1
) {
e.css_global_block_invalid_declaration(declaration);
}
}
context.next();
},
ComplexSelector(node) {
{
const global = node.children.find(is_global);
if (global) {
const idx = node.children.indexOf(global);
if (global.selectors[0].args !== null && idx !== 0 && idx !== node.children.length - 1) {
// ensure `:global(...)` is not used in the middle of a selector (but multiple `global(...)` in sequence are ok)
for (let i = idx + 1; i < node.children.length; i++) {
if (!is_global(node.children[i])) {
e.css_global_invalid_placement(global.selectors[0]);
}
}
}
}
}
// 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) {
e.css_global_invalid_selector_list(selector);
}
// ensure `:global(.class)` is not followed by a type selector, eg: `:global(.class)element`
if (relative_selector.selectors[i + 1]?.type === 'TypeSelector') {
e.css_type_selector_invalid_placement(relative_selector.selectors[i + 1]);
}
// 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)
) {
e.css_global_invalid_selector(selector);
}
}
}
}
},
NestingSelector(node, context) {
const rule = /** @type {Css.Rule} */ (context.state.rule);
if (!rule.metadata.parent_rule) {
e.css_nesting_selector_invalid_placement(node);
}
}
};
const css_visitors = merge(analysis_visitors, validation_visitors);
/**
* @param {Css.StyleSheet} stylesheet
* @param {ComponentAnalysis} analysis
*/
export function analyze_css(stylesheet, analysis) {
walk(stylesheet, { keyframes: analysis.css.keyframes, rule: null }, css_visitors);
}
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