querying.js
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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.findAll = exports.existsOne = exports.findOne = exports.findOneChild = exports.find = exports.filter = void 0;
var domhandler_1 = require("domhandler");
/**
* Search a node and its children for nodes passing a test function.
*
* @param test Function to test nodes on.
* @param node Node to search. Will be included in the result set if it matches.
* @param recurse Also consider child nodes.
* @param limit Maximum number of nodes to return.
* @returns All nodes passing `test`.
*/
function filter(test, node, recurse, limit) {
if (recurse === void 0) { recurse = true; }
if (limit === void 0) { limit = Infinity; }
if (!Array.isArray(node))
node = [node];
return find(test, node, recurse, limit);
}
exports.filter = filter;
/**
* Search an array of node and its children for nodes passing a test function.
*
* @param test Function to test nodes on.
* @param nodes Array of nodes to search.
* @param recurse Also consider child nodes.
* @param limit Maximum number of nodes to return.
* @returns All nodes passing `test`.
*/
function find(test, nodes, recurse, limit) {
var result = [];
for (var _i = 0, nodes_1 = nodes; _i < nodes_1.length; _i++) {
var elem = nodes_1[_i];
if (test(elem)) {
result.push(elem);
if (--limit <= 0)
break;
}
if (recurse && (0, domhandler_1.hasChildren)(elem) && elem.children.length > 0) {
var children = find(test, elem.children, recurse, limit);
result.push.apply(result, children);
limit -= children.length;
if (limit <= 0)
break;
}
}
return result;
}
exports.find = find;
/**
* Finds the first element inside of an array that matches a test function.
*
* @param test Function to test nodes on.
* @param nodes Array of nodes to search.
* @returns The first node in the array that passes `test`.
*/
function findOneChild(test, nodes) {
return nodes.find(test);
}
exports.findOneChild = findOneChild;
/**
* Finds one element in a tree that passes a test.
*
* @param test Function to test nodes on.
* @param nodes Array of nodes to search.
* @param recurse Also consider child nodes.
* @returns The first child node that passes `test`.
*/
function findOne(test, nodes, recurse) {
if (recurse === void 0) { recurse = true; }
var elem = null;
for (var i = 0; i < nodes.length && !elem; i++) {
var checked = nodes[i];
if (!(0, domhandler_1.isTag)(checked)) {
continue;
}
else if (test(checked)) {
elem = checked;
}
else if (recurse && checked.children.length > 0) {
elem = findOne(test, checked.children);
}
}
return elem;
}
exports.findOne = findOne;
/**
* @param test Function to test nodes on.
* @param nodes Array of nodes to search.
* @returns Whether a tree of nodes contains at least one node passing a test.
*/
function existsOne(test, nodes) {
return nodes.some(function (checked) {
return (0, domhandler_1.isTag)(checked) &&
(test(checked) ||
(checked.children.length > 0 &&
existsOne(test, checked.children)));
});
}
exports.existsOne = existsOne;
/**
* Search and array of nodes and its children for nodes passing a test function.
*
* Same as `find`, only with less options, leading to reduced complexity.
*
* @param test Function to test nodes on.
* @param nodes Array of nodes to search.
* @returns All nodes passing `test`.
*/
function findAll(test, nodes) {
var _a;
var result = [];
var stack = nodes.filter(domhandler_1.isTag);
var elem;
while ((elem = stack.shift())) {
var children = (_a = elem.children) === null || _a === void 0 ? void 0 : _a.filter(domhandler_1.isTag);
if (children && children.length > 0) {
stack.unshift.apply(stack, children);
}
if (test(elem))
result.push(elem);
}
return result;
}
exports.findAll = findAll;