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import { parse, SelectorType, isTraversal } from "css-what";
import { _compileToken as compileToken, prepareContext, } from "css-select";
import * as DomUtils from "domutils";
import * as boolbase from "boolbase";
import { getDocumentRoot, groupSelectors } from "./helpers.js";
import { isFilter, getLimit, } from "./positionals.js";
// Re-export pseudo extension points
export { filters, pseudos, aliases } from "css-select";
const UNIVERSAL_SELECTOR = {
type: SelectorType.Universal,
namespace: null,
};
const SCOPE_PSEUDO = {
type: SelectorType.Pseudo,
name: "scope",
data: null,
};
export function is(element, selector, options = {}) {
return some([element], selector, options);
}
export function some(elements, selector, options = {}) {
if (typeof selector === "function")
return elements.some(selector);
const [plain, filtered] = groupSelectors(parse(selector));
return ((plain.length > 0 && elements.some(compileToken(plain, options))) ||
filtered.some((sel) => filterBySelector(sel, elements, options).length > 0));
}
function filterByPosition(filter, elems, data, options) {
const num = typeof data === "string" ? parseInt(data, 10) : NaN;
switch (filter) {
case "first":
case "lt":
// Already done in `getLimit`
return elems;
case "last":
return elems.length > 0 ? [elems[elems.length - 1]] : elems;
case "nth":
case "eq":
return isFinite(num) && Math.abs(num) < elems.length
? [num < 0 ? elems[elems.length + num] : elems[num]]
: [];
case "gt":
return isFinite(num) ? elems.slice(num + 1) : [];
case "even":
return elems.filter((_, i) => i % 2 === 0);
case "odd":
return elems.filter((_, i) => i % 2 === 1);
case "not": {
const filtered = new Set(filterParsed(data, elems, options));
return elems.filter((e) => !filtered.has(e));
}
}
}
export function filter(selector, elements, options = {}) {
return filterParsed(parse(selector), elements, options);
}
/**
* Filter a set of elements by a selector.
*
* Will return elements in the original order.
*
* @param selector Selector to filter by.
* @param elements Elements to filter.
* @param options Options for selector.
*/
function filterParsed(selector, elements, options) {
if (elements.length === 0)
return [];
const [plainSelectors, filteredSelectors] = groupSelectors(selector);
let found;
if (plainSelectors.length) {
const filtered = filterElements(elements, plainSelectors, options);
// If there are no filters, just return
if (filteredSelectors.length === 0) {
return filtered;
}
// Otherwise, we have to do some filtering
if (filtered.length) {
found = new Set(filtered);
}
}
for (let i = 0; i < filteredSelectors.length && (found === null || found === void 0 ? void 0 : found.size) !== elements.length; i++) {
const filteredSelector = filteredSelectors[i];
const missing = found
? elements.filter((e) => DomUtils.isTag(e) && !found.has(e))
: elements;
if (missing.length === 0)
break;
const filtered = filterBySelector(filteredSelector, elements, options);
if (filtered.length) {
if (!found) {
/*
* If we haven't found anything before the last selector,
* just return what we found now.
*/
if (i === filteredSelectors.length - 1) {
return filtered;
}
found = new Set(filtered);
}
else {
filtered.forEach((el) => found.add(el));
}
}
}
return typeof found !== "undefined"
? (found.size === elements.length
? elements
: // Filter elements to preserve order
elements.filter((el) => found.has(el)))
: [];
}
function filterBySelector(selector, elements, options) {
var _a;
if (selector.some(isTraversal)) {
/*
* Get root node, run selector with the scope
* set to all of our nodes.
*/
const root = (_a = options.root) !== null && _a !== void 0 ? _a : getDocumentRoot(elements[0]);
const opts = { ...options, context: elements, relativeSelector: false };
selector.push(SCOPE_PSEUDO);
return findFilterElements(root, selector, opts, true, elements.length);
}
// Performance optimization: If we don't have to traverse, just filter set.
return findFilterElements(elements, selector, options, false, elements.length);
}
export function select(selector, root, options = {}, limit = Infinity) {
if (typeof selector === "function") {
return find(root, selector);
}
const [plain, filtered] = groupSelectors(parse(selector));
const results = filtered.map((sel) => findFilterElements(root, sel, options, true, limit));
// Plain selectors can be queried in a single go
if (plain.length) {
results.push(findElements(root, plain, options, limit));
}
if (results.length === 0) {
return [];
}
// If there was only a single selector, just return the result
if (results.length === 1) {
return results[0];
}
// Sort results, filtering for duplicates
return DomUtils.uniqueSort(results.reduce((a, b) => [...a, ...b]));
}
/**
*
* @param root Element(s) to search from.
* @param selector Selector to look for.
* @param options Options for querying.
* @param queryForSelector Query multiple levels deep for the initial selector, even if it doesn't contain a traversal.
*/
function findFilterElements(root, selector, options, queryForSelector, totalLimit) {
const filterIndex = selector.findIndex(isFilter);
const sub = selector.slice(0, filterIndex);
const filter = selector[filterIndex];
// If we are at the end of the selector, we can limit the number of elements to retrieve.
const partLimit = selector.length - 1 === filterIndex ? totalLimit : Infinity;
/*
* Set the number of elements to retrieve.
* Eg. for :first, we only have to get a single element.
*/
const limit = getLimit(filter.name, filter.data, partLimit);
if (limit === 0)
return [];
/*
* Skip `findElements` call if our selector starts with a positional
* pseudo.
*/
const elemsNoLimit = sub.length === 0 && !Array.isArray(root)
? DomUtils.getChildren(root).filter(DomUtils.isTag)
: sub.length === 0
? (Array.isArray(root) ? root : [root]).filter(DomUtils.isTag)
: queryForSelector || sub.some(isTraversal)
? findElements(root, [sub], options, limit)
: filterElements(root, [sub], options);
const elems = elemsNoLimit.slice(0, limit);
let result = filterByPosition(filter.name, elems, filter.data, options);
if (result.length === 0 || selector.length === filterIndex + 1) {
return result;
}
const remainingSelector = selector.slice(filterIndex + 1);
const remainingHasTraversal = remainingSelector.some(isTraversal);
if (remainingHasTraversal) {
if (isTraversal(remainingSelector[0])) {
const { type } = remainingSelector[0];
if (type === SelectorType.Sibling ||
type === SelectorType.Adjacent) {
// If we have a sibling traversal, we need to also look at the siblings.
result = prepareContext(result, DomUtils, true);
}
// Avoid a traversal-first selector error.
remainingSelector.unshift(UNIVERSAL_SELECTOR);
}
options = {
...options,
// Avoid absolutizing the selector
relativeSelector: false,
/*
* Add a custom root func, to make sure traversals don't match elements
* that aren't a part of the considered tree.
*/
rootFunc: (el) => result.includes(el),
};
}
else if (options.rootFunc && options.rootFunc !== boolbase.trueFunc) {
options = { ...options, rootFunc: boolbase.trueFunc };
}
/*
* If we have another filter, recursively call `findFilterElements`,
* with the `recursive` flag disabled. We only have to look for more
* elements when we see a traversal.
*
* Otherwise,
*/
return remainingSelector.some(isFilter)
? findFilterElements(result, remainingSelector, options, false, totalLimit)
: remainingHasTraversal
? // Query existing elements to resolve traversal.
findElements(result, [remainingSelector], options, totalLimit)
: // If we don't have any more traversals, simply filter elements.
filterElements(result, [remainingSelector], options);
}
function findElements(root, sel, options, limit) {
const query = compileToken(sel, options, root);
return find(root, query, limit);
}
function find(root, query, limit = Infinity) {
const elems = prepareContext(root, DomUtils, query.shouldTestNextSiblings);
return DomUtils.find((node) => DomUtils.isTag(node) && query(node), elems, true, limit);
}
function filterElements(elements, sel, options) {
const els = (Array.isArray(elements) ? elements : [elements]).filter(DomUtils.isTag);
if (els.length === 0)
return els;
const query = compileToken(sel, options);
return query === boolbase.trueFunc ? els : els.filter(query);
}
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