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import { get_possible_values } from './utils.js';
import { regex_ends_with_whitespace, regex_starts_with_whitespace } from '../../patterns.js';
/**
* @typedef {{
* stylesheet: import('#compiler').Css.StyleSheet;
* element: import('#compiler').RegularElement | import('#compiler').SvelteElement;
* }} State
*/
/** @typedef {NODE_PROBABLY_EXISTS | NODE_DEFINITELY_EXISTS} NodeExistsValue */
const NODE_PROBABLY_EXISTS = 0;
const NODE_DEFINITELY_EXISTS = 1;
const whitelist_attribute_selector = new Map([
['details', ['open']],
['dialog', ['open']]
]);
/** @type {import('#compiler').Css.Combinator} */
const descendant_combinator = {
type: 'Combinator',
name: ' ',
start: -1,
end: -1
};
/** @type {import('#compiler').Css.RelativeSelector} */
const nesting_selector = {
type: 'RelativeSelector',
start: -1,
end: -1,
combinator: null,
selectors: [
{
type: 'NestingSelector',
name: '&',
start: -1,
end: -1
}
],
metadata: {
is_global: false,
is_global_like: false,
scoped: false
}
};
/**
*
* @param {import('#compiler').Css.StyleSheet} stylesheet
* @param {import('#compiler').RegularElement | import('#compiler').SvelteElement} element
*/
export function prune(stylesheet, element) {
walk(stylesheet, { stylesheet, element }, visitors);
}
/** @type {import('zimmerframe').Visitors<import('#compiler').Css.Node, State>} */
const visitors = {
Rule(node, context) {
if (node.metadata.is_global_block) {
context.visit(node.prelude);
} else {
context.next();
}
},
ComplexSelector(node, context) {
const selectors = truncate(node);
const inner = selectors[selectors.length - 1];
if (node.metadata.rule?.metadata.parent_rule) {
const has_explicit_nesting_selector = selectors.some((selector) =>
selector.selectors.some((s) => s.type === 'NestingSelector')
);
if (!has_explicit_nesting_selector) {
selectors[0] = {
...selectors[0],
combinator: descendant_combinator
};
selectors.unshift(nesting_selector);
}
}
if (
apply_selector(
selectors,
/** @type {import('#compiler').Css.Rule} */ (node.metadata.rule),
context.state.element,
context.state.stylesheet
)
) {
mark(inner, context.state.element);
node.metadata.used = true;
}
// note: we don't call context.next() here, we only recurse into
// selectors that don't belong to rules (i.e. inside `:is(...)` etc)
// when we encounter them below
}
};
/**
* Discard trailing `:global(...)` selectors, these are unused for scoping purposes
* @param {import('#compiler').Css.ComplexSelector} node
*/
function truncate(node) {
const i = node.children.findLastIndex(({ metadata }) => {
return !metadata.is_global && !metadata.is_global_like;
});
return node.children.slice(0, i + 1);
}
/**
* @param {import('#compiler').Css.RelativeSelector[]} relative_selectors
* @param {import('#compiler').Css.Rule} rule
* @param {import('#compiler').RegularElement | import('#compiler').SvelteElement} element
* @param {import('#compiler').Css.StyleSheet} stylesheet
* @returns {boolean}
*/
function apply_selector(relative_selectors, rule, element, stylesheet) {
const parent_selectors = relative_selectors.slice();
const relative_selector = parent_selectors.pop();
if (!relative_selector) return false;
const possible_match = relative_selector_might_apply_to_node(
relative_selector,
rule,
element,
stylesheet
);
if (!possible_match) {
return false;
}
if (relative_selector.combinator) {
const name = relative_selector.combinator.name;
switch (name) {
case ' ':
case '>': {
let parent = /** @type {import('#compiler').TemplateNode | null} */ (element.parent);
let parent_matched = false;
let crossed_component_boundary = false;
while (parent) {
if (parent.type === 'Component' || parent.type === 'SvelteComponent') {
crossed_component_boundary = true;
}
if (parent.type === 'RegularElement' || parent.type === 'SvelteElement') {
if (apply_selector(parent_selectors, rule, parent, stylesheet)) {
// TODO the `name === ' '` causes false positives, but removing it causes false negatives...
if (name === ' ' || crossed_component_boundary) {
mark(parent_selectors[parent_selectors.length - 1], parent);
}
parent_matched = true;
}
if (name === '>') return parent_matched;
}
parent = /** @type {import('#compiler').TemplateNode | null} */ (parent.parent);
}
return parent_matched || parent_selectors.every((selector) => is_global(selector, rule));
}
case '+':
case '~': {
const siblings = get_possible_element_siblings(element, name === '+');
let sibling_matched = false;
for (const possible_sibling of siblings.keys()) {
if (possible_sibling.type === 'RenderTag' || possible_sibling.type === 'SlotElement') {
// `{@render foo()}<p>foo</p>` with `:global(.x) + p` is a match
if (parent_selectors.length === 1 && parent_selectors[0].metadata.is_global) {
mark(relative_selector, element);
sibling_matched = true;
}
} else if (apply_selector(parent_selectors, rule, possible_sibling, stylesheet)) {
mark(relative_selector, element);
sibling_matched = true;
}
}
return (
sibling_matched ||
(get_element_parent(element) === null &&
parent_selectors.every((selector) => is_global(selector, rule)))
);
}
default:
// TODO other combinators
return true;
}
}
// if this is the left-most non-global selector, mark it — we want
// `x y z {...}` to become `x.blah y z.blah {...}`
const parent = parent_selectors[parent_selectors.length - 1];
if (!parent || is_global(parent, rule)) {
mark(relative_selector, element);
}
return true;
}
/**
* Mark both the compound selector and the node it selects as encapsulated,
* for transformation in a later step
* @param {import('#compiler').Css.RelativeSelector} relative_selector
* @param {import('#compiler').RegularElement | import('#compiler').SvelteElement} element
*/
function mark(relative_selector, element) {
relative_selector.metadata.scoped = true;
element.metadata.scoped = true;
}
/**
* Returns `true` if the relative selector is global, meaning
* it's a `:global(...)` or unscopeable selector, or
* is an `:is(...)` or `:where(...)` selector that contains
* a global selector
* @param {import('#compiler').Css.RelativeSelector} selector
* @param {import('#compiler').Css.Rule} rule
*/
function is_global(selector, rule) {
if (selector.metadata.is_global || selector.metadata.is_global_like) {
return true;
}
for (const s of selector.selectors) {
/** @type {import('#compiler').Css.SelectorList | null} */
let selector_list = null;
let owner = rule;
if (s.type === 'PseudoClassSelector') {
if ((s.name === 'is' || s.name === 'where') && s.args) {
selector_list = s.args;
}
}
if (s.type === 'NestingSelector') {
owner = /** @type {import('#compiler').Css.Rule} */ (rule.metadata.parent_rule);
selector_list = owner.prelude;
}
const has_global_selectors = selector_list?.children.some((complex_selector) => {
return complex_selector.children.every((relative_selector) =>
is_global(relative_selector, owner)
);
});
if (!has_global_selectors) {
return false;
}
}
return true;
}
const regex_backslash_and_following_character = /\\(.)/g;
/**
* Ensure that `element` satisfies each simple selector in `relative_selector`
*
* @param {import('#compiler').Css.RelativeSelector} relative_selector
* @param {import('#compiler').Css.Rule} rule
* @param {import('#compiler').RegularElement | import('#compiler').SvelteElement} element
* @param {import('#compiler').Css.StyleSheet} stylesheet
* @returns {boolean}
*/
function relative_selector_might_apply_to_node(relative_selector, rule, element, stylesheet) {
for (const selector of relative_selector.selectors) {
if (selector.type === 'Percentage' || selector.type === 'Nth') continue;
const name = selector.name.replace(regex_backslash_and_following_character, '$1');
switch (selector.type) {
case 'PseudoClassSelector': {
if (name === 'host' || name === 'root') {
return false;
}
if (name === 'global' && relative_selector.selectors.length === 1) {
const args = /** @type {import('#compiler').Css.SelectorList} */ (selector.args);
const complex_selector = args.children[0];
return apply_selector(complex_selector.children, rule, element, stylesheet);
}
if ((name === 'is' || name === 'where') && selector.args) {
let matched = false;
for (const complex_selector of selector.args.children) {
if (apply_selector(truncate(complex_selector), rule, element, stylesheet)) {
complex_selector.metadata.used = true;
matched = true;
}
}
if (!matched) {
return false;
}
}
break;
}
case 'PseudoElementSelector': {
break;
}
case 'AttributeSelector': {
const whitelisted = whitelist_attribute_selector.get(element.name.toLowerCase());
if (
!whitelisted?.includes(selector.name.toLowerCase()) &&
!attribute_matches(
element,
selector.name,
selector.value && unquote(selector.value),
selector.matcher,
selector.flags?.includes('i') ?? false
)
) {
return false;
}
break;
}
case 'ClassSelector': {
if (
!attribute_matches(element, 'class', name, '~=', false) &&
!element.attributes.some(
(attribute) => attribute.type === 'ClassDirective' && attribute.name === name
)
) {
return false;
}
break;
}
case 'IdSelector': {
if (!attribute_matches(element, 'id', name, '=', false)) {
return false;
}
break;
}
case 'TypeSelector': {
if (
element.name.toLowerCase() !== name.toLowerCase() &&
name !== '*' &&
element.type !== 'SvelteElement'
) {
return false;
}
break;
}
case 'NestingSelector': {
let matched = false;
const parent = /** @type {import('#compiler').Css.Rule} */ (rule.metadata.parent_rule);
for (const complex_selector of parent.prelude.children) {
if (apply_selector(truncate(complex_selector), parent, element, stylesheet)) {
complex_selector.metadata.used = true;
matched = true;
}
}
if (!matched) {
return false;
}
break;
}
}
}
// possible match
return true;
}
/**
* @param {any} operator
* @param {any} expected_value
* @param {any} case_insensitive
* @param {any} value
*/
function test_attribute(operator, expected_value, case_insensitive, value) {
if (case_insensitive) {
expected_value = expected_value.toLowerCase();
value = value.toLowerCase();
}
switch (operator) {
case '=':
return value === expected_value;
case '~=':
return value.split(/\s/).includes(expected_value);
case '|=':
return `${value}-`.startsWith(`${expected_value}-`);
case '^=':
return value.startsWith(expected_value);
case '$=':
return value.endsWith(expected_value);
case '*=':
return value.includes(expected_value);
default:
throw new Error("this shouldn't happen");
}
}
/**
* @param {import('#compiler').RegularElement | import('#compiler').SvelteElement} node
* @param {string} name
* @param {string | null} expected_value
* @param {string | null} operator
* @param {boolean} case_insensitive
*/
function attribute_matches(node, name, expected_value, operator, case_insensitive) {
for (const attribute of node.attributes) {
if (attribute.type === 'SpreadAttribute') return true;
if (attribute.type === 'BindDirective' && attribute.name === name) return true;
if (attribute.type !== 'Attribute') continue;
if (attribute.name.toLowerCase() !== name.toLowerCase()) continue;
if (attribute.value === true) return operator === null;
if (expected_value === null) return true;
const chunks = attribute.value;
if (chunks.length === 1) {
const value = chunks[0];
if (value.type === 'Text') {
return test_attribute(operator, expected_value, case_insensitive, value.data);
}
}
const possible_values = new Set();
/** @type {string[]} */
let prev_values = [];
for (const chunk of chunks) {
const current_possible_values = get_possible_values(chunk);
// impossible to find out all combinations
if (!current_possible_values) return true;
if (prev_values.length > 0) {
/** @type {string[]} */
const start_with_space = [];
/** @type {string[]} */
const remaining = [];
current_possible_values.forEach((current_possible_value) => {
if (regex_starts_with_whitespace.test(current_possible_value)) {
start_with_space.push(current_possible_value);
} else {
remaining.push(current_possible_value);
}
});
if (remaining.length > 0) {
if (start_with_space.length > 0) {
prev_values.forEach((prev_value) => possible_values.add(prev_value));
}
/** @type {string[]} */
const combined = [];
prev_values.forEach((prev_value) => {
remaining.forEach((value) => {
combined.push(prev_value + value);
});
});
prev_values = combined;
start_with_space.forEach((value) => {
if (regex_ends_with_whitespace.test(value)) {
possible_values.add(value);
} else {
prev_values.push(value);
}
});
continue;
} else {
prev_values.forEach((prev_value) => possible_values.add(prev_value));
prev_values = [];
}
}
current_possible_values.forEach((current_possible_value) => {
if (regex_ends_with_whitespace.test(current_possible_value)) {
possible_values.add(current_possible_value);
} else {
prev_values.push(current_possible_value);
}
});
if (prev_values.length < current_possible_values.size) {
prev_values.push(' ');
}
if (prev_values.length > 20) {
// might grow exponentially, bail out
return true;
}
}
prev_values.forEach((prev_value) => possible_values.add(prev_value));
for (const value of possible_values) {
if (test_attribute(operator, expected_value, case_insensitive, value)) return true;
}
}
return false;
}
/** @param {string} str */
function unquote(str) {
if ((str[0] === str[str.length - 1] && str[0] === "'") || str[0] === '"') {
return str.slice(1, str.length - 1);
}
return str;
}
/**
* @param {import('#compiler').RegularElement | import('#compiler').SvelteElement} node
* @returns {import('#compiler').RegularElement | import('#compiler').SvelteElement | null}
*/
function get_element_parent(node) {
/** @type {import('#compiler').SvelteNode | null} */
let parent = node;
while (
// @ts-expect-error TODO figure out a more elegant solution
(parent = parent.parent) &&
parent.type !== 'RegularElement' &&
parent.type !== 'SvelteElement'
);
return parent ?? null;
}
/**
* Finds the given node's previous sibling in the DOM
*
* The Svelte `<slot>` is just a placeholder and is not actually real. Any children nodes
* in `<slot>` are 'flattened' and considered as the same level as the `<slot>`'s siblings
*
* e.g.
* ```html
* <h1>Heading 1</h1>
* <slot>
* <h2>Heading 2</h2>
* </slot>
* ```
*
* is considered to look like:
* ```html
* <h1>Heading 1</h1>
* <h2>Heading 2</h2>
* ```
* @param {import('#compiler').SvelteNode} node
* @returns {import('#compiler').SvelteNode}
*/
function find_previous_sibling(node) {
/** @type {import('#compiler').SvelteNode} */
let current_node = node;
while (
// @ts-expect-error TODO
!current_node.prev &&
// @ts-expect-error TODO
current_node.parent?.type === 'SlotElement'
) {
// @ts-expect-error TODO
current_node = current_node.parent;
}
// @ts-expect-error
current_node = current_node.prev;
while (current_node?.type === 'SlotElement') {
const slot_children = current_node.fragment.nodes;
if (slot_children.length > 0) {
current_node = slot_children.slice(-1)[0];
} else {
break;
}
}
return current_node;
}
/**
* @param {import('#compiler').SvelteNode} node
* @param {boolean} adjacent_only
* @returns {Map<import('#compiler').RegularElement | import('#compiler').SvelteElement | import('#compiler').SlotElement | import('#compiler').RenderTag, NodeExistsValue>}
*/
function get_possible_element_siblings(node, adjacent_only) {
/** @type {Map<import('#compiler').RegularElement | import('#compiler').SvelteElement | import('#compiler').SlotElement | import('#compiler').RenderTag, NodeExistsValue>} */
const result = new Map();
/** @type {import('#compiler').SvelteNode} */
let prev = node;
while ((prev = find_previous_sibling(prev))) {
if (prev.type === 'RegularElement') {
if (
!prev.attributes.find(
(attr) => attr.type === 'Attribute' && attr.name.toLowerCase() === 'slot'
)
) {
result.set(prev, NODE_DEFINITELY_EXISTS);
}
if (adjacent_only) {
break;
}
} else if (prev.type === 'EachBlock' || prev.type === 'IfBlock' || prev.type === 'AwaitBlock') {
const possible_last_child = get_possible_last_child(prev, adjacent_only);
add_to_map(possible_last_child, result);
if (adjacent_only && has_definite_elements(possible_last_child)) {
return result;
}
} else if (
prev.type === 'SlotElement' ||
prev.type === 'RenderTag' ||
prev.type === 'SvelteElement'
) {
result.set(prev, NODE_PROBABLY_EXISTS);
// Special case: slots, render tags and svelte:element tags could resolve to no siblings,
// so we want to continue until we find a definite sibling even with the adjacent-only combinator
}
}
if (!prev || !adjacent_only) {
/** @type {import('#compiler').SvelteNode | null} */
let parent = node;
while (
// @ts-expect-error TODO
(parent = parent?.parent) &&
(parent.type === 'EachBlock' || parent.type === 'IfBlock' || parent.type === 'AwaitBlock')
) {
const possible_siblings = get_possible_element_siblings(parent, adjacent_only);
add_to_map(possible_siblings, result);
// @ts-expect-error
if (parent.type === 'EachBlock' && !parent.fallback?.nodes.includes(node)) {
// `{#each ...}<a /><b />{/each}` — `<b>` can be previous sibling of `<a />`
add_to_map(get_possible_last_child(parent, adjacent_only), result);
}
if (adjacent_only && has_definite_elements(possible_siblings)) {
break;
}
}
}
return result;
}
/**
* @param {import('#compiler').EachBlock | import('#compiler').IfBlock | import('#compiler').AwaitBlock} relative_selector
* @param {boolean} adjacent_only
* @returns {Map<import('#compiler').RegularElement, NodeExistsValue>}
*/
function get_possible_last_child(relative_selector, adjacent_only) {
/** @typedef {Map<import('#compiler').RegularElement, NodeExistsValue>} NodeMap */
/** @type {NodeMap} */
const result = new Map();
if (relative_selector.type === 'EachBlock') {
/** @type {NodeMap} */
const each_result = loop_child(relative_selector.body.nodes, adjacent_only);
/** @type {NodeMap} */
const else_result = relative_selector.fallback
? loop_child(relative_selector.fallback.nodes, adjacent_only)
: new Map();
const not_exhaustive = !has_definite_elements(else_result);
if (not_exhaustive) {
mark_as_probably(each_result);
mark_as_probably(else_result);
}
add_to_map(each_result, result);
add_to_map(else_result, result);
} else if (relative_selector.type === 'IfBlock') {
/** @type {NodeMap} */
const if_result = loop_child(relative_selector.consequent.nodes, adjacent_only);
/** @type {NodeMap} */
const else_result = relative_selector.alternate
? loop_child(relative_selector.alternate.nodes, adjacent_only)
: new Map();
const not_exhaustive = !has_definite_elements(if_result) || !has_definite_elements(else_result);
if (not_exhaustive) {
mark_as_probably(if_result);
mark_as_probably(else_result);
}
add_to_map(if_result, result);
add_to_map(else_result, result);
} else if (relative_selector.type === 'AwaitBlock') {
/** @type {NodeMap} */
const pending_result = relative_selector.pending
? loop_child(relative_selector.pending.nodes, adjacent_only)
: new Map();
/** @type {NodeMap} */
const then_result = relative_selector.then
? loop_child(relative_selector.then.nodes, adjacent_only)
: new Map();
/** @type {NodeMap} */
const catch_result = relative_selector.catch
? loop_child(relative_selector.catch.nodes, adjacent_only)
: new Map();
const not_exhaustive =
!has_definite_elements(pending_result) ||
!has_definite_elements(then_result) ||
!has_definite_elements(catch_result);
if (not_exhaustive) {
mark_as_probably(pending_result);
mark_as_probably(then_result);
mark_as_probably(catch_result);
}
add_to_map(pending_result, result);
add_to_map(then_result, result);
add_to_map(catch_result, result);
}
return result;
}
/**
* @param {Map<unknown, NodeExistsValue>} result
* @returns {boolean}
*/
function has_definite_elements(result) {
if (result.size === 0) return false;
for (const exist of result.values()) {
if (exist === NODE_DEFINITELY_EXISTS) {
return true;
}
}
return false;
}
/**
* @template T
* @param {Map<T, NodeExistsValue>} from
* @param {Map<T, NodeExistsValue>} to
* @returns {void}
*/
function add_to_map(from, to) {
from.forEach((exist, element) => {
to.set(element, higher_existence(exist, to.get(element)));
});
}
/**
* @param {NodeExistsValue | undefined} exist1
* @param {NodeExistsValue | undefined} exist2
* @returns {NodeExistsValue}
*/
function higher_existence(exist1, exist2) {
// @ts-expect-error TODO figure out if this is a bug
if (exist1 === undefined || exist2 === undefined) return exist1 || exist2;
return exist1 > exist2 ? exist1 : exist2;
}
/** @param {Map<import('#compiler').RegularElement, NodeExistsValue>} result */
function mark_as_probably(result) {
for (const key of result.keys()) {
result.set(key, NODE_PROBABLY_EXISTS);
}
}
/**
* @param {import('#compiler').SvelteNode[]} children
* @param {boolean} adjacent_only
*/
function loop_child(children, adjacent_only) {
/** @type {Map<import('#compiler').RegularElement, NodeExistsValue>} */
const result = new Map();
for (let i = children.length - 1; i >= 0; i--) {
const child = children[i];
if (child.type === 'RegularElement') {
result.set(child, NODE_DEFINITELY_EXISTS);
if (adjacent_only) {
break;
}
} else if (
child.type === 'EachBlock' ||
child.type === 'IfBlock' ||
child.type === 'AwaitBlock'
) {
const child_result = get_possible_last_child(child, adjacent_only);
add_to_map(child_result, result);
if (adjacent_only && has_definite_elements(child_result)) {
break;
}
}
}
return result;
}
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