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10894x 2x 2x 2x 2x 2x 2x 16618x 16618x 16618x 16618x 16618x 2x 2x 5784x 5784x 5204x 5204x 5784x 2x 2x 2x 2x 2x 3854x 3854x 3854x 3854x 13770x 13770x 3866x 3866x 802x 802x 13770x 9904x 9904x 8370x 9904x 1534x 1534x 1534x 34x 34x 1534x 13770x 3854x 3854x | /** @import { Visitors } from 'zimmerframe' */
/** @import * as Compiler from '#compiler' */
import { walk } from 'zimmerframe';
import { get_possible_values } from './utils.js';
import { regex_ends_with_whitespace, regex_starts_with_whitespace } from '../../patterns.js';
import { get_attribute_chunks, is_text_attribute } from '../../../utils/ast.js';
/**
* @typedef {{
* stylesheet: Compiler.Css.StyleSheet;
* element: Compiler.AST.RegularElement | Compiler.AST.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 {Compiler.Css.Combinator} */
const descendant_combinator = {
type: 'Combinator',
name: ' ',
start: -1,
end: -1
};
/** @type {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 {Compiler.Css.StyleSheet} stylesheet
* @param {Compiler.AST.RegularElement | Compiler.AST.SvelteElement} element
*/
export function prune(stylesheet, element) {
walk(stylesheet, { stylesheet, element }, visitors);
}
/** @type {Visitors<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 && selectors.length > 0) {
let has_explicit_nesting_selector = false;
// nesting could be inside pseudo classes like :is, :has or :where
for (let selector of selectors) {
walk(
selector,
{},
{
// @ts-ignore
NestingSelector() {
has_explicit_nesting_selector = true;
}
}
);
// if we found one we can break from the others
if (has_explicit_nesting_selector) break;
}
if (!has_explicit_nesting_selector) {
selectors[0] = {
...selectors[0],
combinator: descendant_combinator
};
selectors.unshift(nesting_selector);
}
}
if (
apply_selector(
selectors,
/** @type {Compiler.Css.Rule} */ (node.metadata.rule),
context.state.element,
context.state.stylesheet,
true
)
) {
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 without a `:has(...)` modifier, these are unused for scoping purposes
* @param {Compiler.Css.ComplexSelector} node
*/
function truncate(node) {
const i = node.children.findLastIndex(({ metadata, selectors }) => {
return (
!metadata.is_global_like &&
(!metadata.is_global ||
selectors.some(
(selector) => selector.type === 'PseudoClassSelector' && selector.name === 'has'
))
);
});
return node.children.slice(0, i + 1);
}
/**
* @param {Compiler.Css.RelativeSelector[]} relative_selectors
* @param {Compiler.Css.Rule} rule
* @param {Compiler.AST.RegularElement | Compiler.AST.SvelteElement} element
* @param {Compiler.Css.StyleSheet} stylesheet
* @param {boolean} check_has Whether or not to check the `:has(...)` selectors
* @returns {boolean}
*/
function apply_selector(relative_selectors, rule, element, stylesheet, check_has) {
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,
check_has
);
if (!possible_match) {
return false;
}
if (relative_selector.combinator) {
return apply_combinator(
relative_selector.combinator,
relative_selector,
parent_selectors,
rule,
element,
stylesheet,
check_has
);
}
// 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;
}
/**
* @param {Compiler.Css.Combinator} combinator
* @param {Compiler.Css.RelativeSelector} relative_selector
* @param {Compiler.Css.RelativeSelector[]} parent_selectors
* @param {Compiler.Css.Rule} rule
* @param {Compiler.AST.RegularElement | Compiler.AST.SvelteElement} element
* @param {Compiler.Css.StyleSheet} stylesheet
* @param {boolean} check_has Whether or not to check the `:has(...)` selectors
* @returns {boolean}
*/
function apply_combinator(
combinator,
relative_selector,
parent_selectors,
rule,
element,
stylesheet,
check_has
) {
const name = combinator.name;
switch (name) {
case ' ':
case '>': {
let parent = /** @type {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, check_has)) {
// 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 {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, check_has)
) {
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;
}
}
/**
* Mark both the compound selector and the node it selects as encapsulated,
* for transformation in a later step
* @param {Compiler.Css.RelativeSelector} relative_selector
* @param {Compiler.AST.RegularElement | Compiler.AST.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 {Compiler.Css.RelativeSelector} selector
* @param {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 {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 {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 {Compiler.Css.RelativeSelector} relative_selector
* @param {Compiler.Css.Rule} rule
* @param {Compiler.AST.RegularElement | Compiler.AST.SvelteElement} element
* @param {Compiler.Css.StyleSheet} stylesheet
* @param {boolean} check_has Whether or not to check the `:has(...)` selectors
* @returns {boolean}
*/
function relative_selector_might_apply_to_node(
relative_selector,
rule,
element,
stylesheet,
check_has
) {
// Sort :has(...) selectors in one bucket and everything else into another
const has_selectors = [];
const other_selectors = [];
for (const selector of relative_selector.selectors) {
if (selector.type === 'PseudoClassSelector' && selector.name === 'has' && selector.args) {
has_selectors.push(selector);
} else {
other_selectors.push(selector);
}
}
// If we're called recursively from a :has(...) selector, we're on the way of checking if the other selectors match.
// In that case ignore this check (because we just came from this) to avoid an infinite loop.
if (check_has && has_selectors.length > 0) {
// :has(...) is special in that it means "look downwards in the CSS tree". Since our matching algorithm goes
// upwards and back-to-front, we need to first check the selectors inside :has(...), then check the rest of the
// selector in a way that is similar to ancestor matching. In a sense, we're treating `.x:has(.y)` as `.x .y`.
for (const has_selector of has_selectors) {
const complex_selectors = /** @type {Compiler.Css.SelectorList} */ (has_selector.args)
.children;
let matched = false;
for (const complex_selector of complex_selectors) {
const selectors = truncate(complex_selector);
const left_most_combinator = selectors[0]?.combinator ?? descendant_combinator;
// In .x:has(> y), we want to search for y, ignoring the left-most combinator
// (else it would try to walk further up and fail because there are no selectors left)
if (selectors.length > 0) {
selectors[0] = {
...selectors[0],
combinator: null
};
}
if (
selectors.length === 0 /* is :global(...) */ ||
apply_selector(selectors, rule, element, stylesheet, check_has)
) {
// Treat e.g. `.x:has(.y)` as `.x .y` with the .y part already being matched,
// and now looking upwards for the .x part.
if (
apply_combinator(
left_most_combinator,
selectors[0] ?? [],
[relative_selector],
rule,
element,
stylesheet,
false
)
) {
complex_selector.metadata.used = true;
matched = true;
}
}
}
if (!matched) {
if (relative_selector.metadata.is_global && !relative_selector.metadata.is_global_like) {
// Edge case: `:global(.x):has(.y)` where `.x` is global but `.y` doesn't match.
// Since `used` is set to `true` for `:global(.x)` in css-analyze beforehand, and
// we have no way of knowing if it's safe to set it back to `false`, we'll mark
// the inner selector as used and scoped to prevent it from being pruned, which could
// result in a invalid CSS output (e.g. `.x:has(/* unused .y */)`). The result
// can't match a real element, so the only drawback is the missing prune.
// TODO clean this up some day
complex_selectors[0].metadata.used = true;
complex_selectors[0].children.forEach((selector) => {
selector.metadata.scoped = true;
});
}
return false;
}
}
return true;
}
for (const selector of other_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' &&
selector.args !== null &&
relative_selector.selectors.length === 1
) {
const args = selector.args;
const complex_selector = args.children[0];
return apply_selector(complex_selector.children, rule, element, stylesheet, check_has);
}
// We came across a :global, everything beyond it is global and therefore a potential match
if (name === 'global' && selector.args === null) return true;
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, check_has)) {
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 {Compiler.Css.Rule} */ (rule.metadata.parent_rule);
for (const complex_selector of parent.prelude.children) {
if (apply_selector(truncate(complex_selector), parent, element, stylesheet, check_has)) {
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 {Compiler.AST.RegularElement | Compiler.AST.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;
if (is_text_attribute(attribute)) {
return test_attribute(operator, expected_value, case_insensitive, attribute.value[0].data);
}
const chunks = get_attribute_chunks(attribute.value);
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 {Compiler.AST.RegularElement | Compiler.AST.SvelteElement} node
* @returns {Compiler.AST.RegularElement | Compiler.AST.SvelteElement | null}
*/
function get_element_parent(node) {
/** @type {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 {Compiler.SvelteNode} node
* @returns {Compiler.SvelteNode}
*/
function find_previous_sibling(node) {
/** @type {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 {Compiler.SvelteNode} node
* @param {boolean} adjacent_only
* @returns {Map<Compiler.AST.RegularElement | Compiler.AST.SvelteElement | Compiler.AST.SlotElement | Compiler.AST.RenderTag, NodeExistsValue>}
*/
function get_possible_element_siblings(node, adjacent_only) {
/** @type {Map<Compiler.AST.RegularElement | Compiler.AST.SvelteElement | Compiler.AST.SlotElement | Compiler.AST.RenderTag, NodeExistsValue>} */
const result = new Map();
/** @type {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 {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 {Compiler.AST.EachBlock | Compiler.AST.IfBlock | Compiler.AST.AwaitBlock} relative_selector
* @param {boolean} adjacent_only
* @returns {Map<Compiler.AST.RegularElement, NodeExistsValue>}
*/
function get_possible_last_child(relative_selector, adjacent_only) {
/** @typedef {Map<Compiler.AST.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<Compiler.AST.RegularElement, NodeExistsValue>} result */
function mark_as_probably(result) {
for (const key of result.keys()) {
result.set(key, NODE_PROBABLY_EXISTS);
}
}
/**
* @param {Compiler.SvelteNode[]} children
* @param {boolean} adjacent_only
*/
function loop_child(children, adjacent_only) {
/** @type {Map<Compiler.AST.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;
}
|