utils.js
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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.isHtml = exports.cloneDom = exports.domEach = exports.cssCase = exports.camelCase = exports.isCheerio = exports.isTag = void 0;
var htmlparser2_1 = require("htmlparser2");
var domhandler_1 = require("domhandler");
/**
* Check if the DOM element is a tag.
*
* `isTag(type)` includes `<script>` and `<style>` tags.
*
* @private
* @category Utils
* @param type - DOM node to check.
* @returns Whether the node is a tag.
*/
exports.isTag = htmlparser2_1.DomUtils.isTag;
/**
* Checks if an object is a Cheerio instance.
*
* @category Utils
* @param maybeCheerio - The object to check.
* @returns Whether the object is a Cheerio instance.
*/
function isCheerio(maybeCheerio) {
return maybeCheerio.cheerio != null;
}
exports.isCheerio = isCheerio;
/**
* Convert a string to camel case notation.
*
* @private
* @category Utils
* @param str - String to be converted.
* @returns String in camel case notation.
*/
function camelCase(str) {
return str.replace(/[_.-](\w|$)/g, function (_, x) { return x.toUpperCase(); });
}
exports.camelCase = camelCase;
/**
* Convert a string from camel case to "CSS case", where word boundaries are
* described by hyphens ("-") and all characters are lower-case.
*
* @private
* @category Utils
* @param str - String to be converted.
* @returns String in "CSS case".
*/
function cssCase(str) {
return str.replace(/[A-Z]/g, '-$&').toLowerCase();
}
exports.cssCase = cssCase;
/**
* Iterate over each DOM element without creating intermediary Cheerio instances.
*
* This is indented for use internally to avoid otherwise unnecessary memory
* pressure introduced by _make.
*
* @category Utils
* @param array - Array to iterate over.
* @param fn - Function to call.
* @returns The original instance.
*/
function domEach(array, fn) {
var len = array.length;
for (var i = 0; i < len; i++)
fn(array[i], i);
return array;
}
exports.domEach = domEach;
/**
* Create a deep copy of the given DOM structure. Sets the parents of the copies
* of the passed nodes to `null`.
*
* @private
* @category Utils
* @param dom - The htmlparser2-compliant DOM structure.
* @returns - The cloned DOM.
*/
function cloneDom(dom) {
var clone = 'length' in dom
? Array.prototype.map.call(dom, function (el) { return domhandler_1.cloneNode(el, true); })
: [domhandler_1.cloneNode(dom, true)];
// Add a root node around the cloned nodes
var root = new domhandler_1.Document(clone);
clone.forEach(function (node) {
node.parent = root;
});
return clone;
}
exports.cloneDom = cloneDom;
/**
* A simple way to check for HTML strings. Tests for a `<` within a string,
* immediate followed by a letter and eventually followed by a `>`.
*
* @private
*/
var quickExpr = /<[a-zA-Z][^]*>/;
/**
* Check if string is HTML.
*
* @private
* @category Utils
* @param str - String to check.
* @returns Indicates if `str` is HTML.
*/
function isHtml(str) {
// Run the regex
return quickExpr.test(str);
}
exports.isHtml = isHtml;