117 lines
4 KiB
JavaScript
117 lines
4 KiB
JavaScript
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import { isTag, isText } from "domhandler";
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import { filter, findOne } from "./querying.js";
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const Checks = {
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tag_name(name) {
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if (typeof name === "function") {
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return (elem) => isTag(elem) && name(elem.name);
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}
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else if (name === "*") {
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return isTag;
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}
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return (elem) => isTag(elem) && elem.name === name;
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},
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tag_type(type) {
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if (typeof type === "function") {
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return (elem) => type(elem.type);
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}
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return (elem) => elem.type === type;
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},
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tag_contains(data) {
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if (typeof data === "function") {
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return (elem) => isText(elem) && data(elem.data);
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}
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return (elem) => isText(elem) && elem.data === data;
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},
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};
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/**
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* @param attrib Attribute to check.
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* @param value Attribute value to look for.
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* @returns A function to check whether the a node has an attribute with a
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* particular value.
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*/
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function getAttribCheck(attrib, value) {
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if (typeof value === "function") {
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return (elem) => isTag(elem) && value(elem.attribs[attrib]);
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}
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return (elem) => isTag(elem) && elem.attribs[attrib] === value;
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}
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/**
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* @param a First function to combine.
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* @param b Second function to combine.
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* @returns A function taking a node and returning `true` if either of the input
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* functions returns `true` for the node.
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*/
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function combineFuncs(a, b) {
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return (elem) => a(elem) || b(elem);
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}
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/**
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* @param options An object describing nodes to look for.
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* @returns A function executing all checks in `options` and returning `true` if
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* any of them match a node.
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*/
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function compileTest(options) {
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const funcs = Object.keys(options).map((key) => {
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const value = options[key];
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return Object.prototype.hasOwnProperty.call(Checks, key)
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? Checks[key](value)
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: getAttribCheck(key, value);
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});
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return funcs.length === 0 ? null : funcs.reduce(combineFuncs);
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}
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/**
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* @category Legacy Query Functions
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* @param options An object describing nodes to look for.
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* @param node The element to test.
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* @returns Whether the element matches the description in `options`.
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*/
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export function testElement(options, node) {
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const test = compileTest(options);
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return test ? test(node) : true;
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}
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/**
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* @category Legacy Query Functions
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* @param options An object describing nodes to look for.
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* @param nodes Nodes to search through.
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* @param recurse Also consider child nodes.
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* @param limit Maximum number of nodes to return.
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* @returns All nodes that match `options`.
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*/
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export function getElements(options, nodes, recurse, limit = Infinity) {
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const test = compileTest(options);
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return test ? filter(test, nodes, recurse, limit) : [];
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}
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/**
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* @category Legacy Query Functions
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* @param id The unique ID attribute value to look for.
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* @param nodes Nodes to search through.
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* @param recurse Also consider child nodes.
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* @returns The node with the supplied ID.
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*/
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export function getElementById(id, nodes, recurse = true) {
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if (!Array.isArray(nodes))
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nodes = [nodes];
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return findOne(getAttribCheck("id", id), nodes, recurse);
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}
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/**
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* @category Legacy Query Functions
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* @param tagName Tag name to search for.
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* @param nodes Nodes to search through.
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* @param recurse Also consider child nodes.
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* @param limit Maximum number of nodes to return.
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* @returns All nodes with the supplied `tagName`.
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*/
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export function getElementsByTagName(tagName, nodes, recurse = true, limit = Infinity) {
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return filter(Checks["tag_name"](tagName), nodes, recurse, limit);
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}
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/**
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* @category Legacy Query Functions
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* @param type Element type to look for.
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* @param nodes Nodes to search through.
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* @param recurse Also consider child nodes.
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* @param limit Maximum number of nodes to return.
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* @returns All nodes with the supplied `type`.
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*/
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export function getElementsByTagType(type, nodes, recurse = true, limit = Infinity) {
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return filter(Checks["tag_type"](type), nodes, recurse, limit);
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}
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//# sourceMappingURL=legacy.js.map
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