125 lines
4.7 KiB
JavaScript
125 lines
4.7 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.getElementsByTagType = exports.getElementsByTagName = exports.getElementById = exports.getElements = exports.testElement = void 0;
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var domhandler_1 = require("domhandler");
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var querying_1 = require("./querying");
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var Checks = {
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tag_name: function (name) {
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if (typeof name === "function") {
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return function (elem) { return (0, domhandler_1.isTag)(elem) && name(elem.name); };
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}
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else if (name === "*") {
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return domhandler_1.isTag;
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}
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return function (elem) { return (0, domhandler_1.isTag)(elem) && elem.name === name; };
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},
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tag_type: function (type) {
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if (typeof type === "function") {
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return function (elem) { return type(elem.type); };
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}
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return function (elem) { return elem.type === type; };
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},
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tag_contains: function (data) {
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if (typeof data === "function") {
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return function (elem) { return (0, domhandler_1.isText)(elem) && data(elem.data); };
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}
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return function (elem) { return (0, domhandler_1.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 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 function (elem) { return (0, domhandler_1.isTag)(elem) && value(elem.attribs[attrib]); };
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}
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return function (elem) { return (0, domhandler_1.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
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* of the input functions returns `true` for the node.
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*/
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function combineFuncs(a, b) {
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return function (elem) { return 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`
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* if any of them match a node.
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*/
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function compileTest(options) {
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var funcs = Object.keys(options).map(function (key) {
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var 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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* @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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function testElement(options, node) {
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var test = compileTest(options);
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return test ? test(node) : true;
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}
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exports.testElement = testElement;
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/**
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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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function getElements(options, nodes, recurse, limit) {
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if (limit === void 0) { limit = Infinity; }
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var test = compileTest(options);
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return test ? (0, querying_1.filter)(test, nodes, recurse, limit) : [];
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}
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exports.getElements = getElements;
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/**
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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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function getElementById(id, nodes, recurse) {
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if (recurse === void 0) { recurse = true; }
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if (!Array.isArray(nodes))
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nodes = [nodes];
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return (0, querying_1.findOne)(getAttribCheck("id", id), nodes, recurse);
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}
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exports.getElementById = getElementById;
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/**
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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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function getElementsByTagName(tagName, nodes, recurse, limit) {
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if (recurse === void 0) { recurse = true; }
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if (limit === void 0) { limit = Infinity; }
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return (0, querying_1.filter)(Checks.tag_name(tagName), nodes, recurse, limit);
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}
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exports.getElementsByTagName = getElementsByTagName;
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/**
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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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function getElementsByTagType(type, nodes, recurse, limit) {
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if (recurse === void 0) { recurse = true; }
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if (limit === void 0) { limit = Infinity; }
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return (0, querying_1.filter)(Checks.tag_type(type), nodes, recurse, limit);
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}
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exports.getElementsByTagType = getElementsByTagType;
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