'use strict';

/**
 * Ponyfill for `Array.prototype.find` which is only available in ES6 runtimes.
 *
 * Works with anything that has a `length` property and index access properties,
 * including NodeList.
 *
 * @param {T[] | { length: number; [number]: T }} list
 * @param {function (item: T, index: number, list:T[]):boolean} predicate
 * @param {Partial<Pick<ArrayConstructor['prototype'], 'find'>>?} ac
 * Allows injecting a custom implementation in tests (`Array.prototype` by default).
 * @returns {T | undefined}
 * @template {unknown} T
 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find
 * @see https://tc39.es/ecma262/multipage/indexed-collections.html#sec-array.prototype.find
 */
function find(list, predicate, ac) {
	if (ac === undefined) {
		ac = Array.prototype;
	}
	if (list && typeof ac.find === 'function') {
		return ac.find.call(list, predicate);
	}
	for (var i = 0; i < list.length; i++) {
		if (hasOwn(list, i)) {
			var item = list[i];
			if (predicate.call(undefined, item, i, list)) {
				return item;
			}
		}
	}
}

/**
 * "Shallow freezes" an object to render it immutable.
 * Uses `Object.freeze` if available,
 * otherwise the immutability is only in the type.
 *
 * Is used to create "enum like" objects.
 *
 * If `Object.getOwnPropertyDescriptors` is available,
 * a new object with all properties of object but without any prototype is created and returned
 * after freezing it.
 *
 * @param {T} object
 * The object to freeze.
 * @param {Pick<ObjectConstructor, 'create' | 'freeze' | 'getOwnPropertyDescriptors'>} [oc=Object]
 * `Object` by default,
 * allows to inject custom object constructor for tests.
 * @returns {Readonly<T>}
 * @template {Object} T
 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze
 * @prettierignore
 */
function freeze(object, oc) {
	if (oc === undefined) {
		oc = Object;
	}
	if (oc && typeof oc.getOwnPropertyDescriptors === 'function') {
		object = oc.create(null, oc.getOwnPropertyDescriptors(object));
	}
	return oc && typeof oc.freeze === 'function' ? oc.freeze(object) : object;
}

/**
 * Implementation for `Object.hasOwn` but ES5 compatible.
 *
 * @param {any} object
 * @param {string | number} key
 * @returns {boolean}
 */
function hasOwn(object, key) {
	return Object.prototype.hasOwnProperty.call(object, key);
}

/**
 * Since xmldom can not rely on `Object.assign`,
 * it uses/provides a simplified version that is sufficient for its needs.
 *
 * @param {Object} target
 * @param {Object | null | undefined} source
 * @returns {Object}
 * The target with the merged/overridden properties.
 * @throws {TypeError}
 * If target is not an object.
 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
 * @see https://tc39.es/ecma262/multipage/fundamental-objects.html#sec-object.assign
 */
function assign(target, source) {
	if (target === null || typeof target !== 'object') {
		throw new TypeError('target is not an object');
	}
	for (var key in source) {
		if (hasOwn(source, key)) {
			target[key] = source[key];
		}
	}
	return target;
}

/**
 * A number of attributes are boolean attributes.
 * The presence of a boolean attribute on an element represents the `true` value,
 * and the absence of the attribute represents the `false` value.
 *
 * If the attribute is present, its value must either be the empty string, or a value that is
 * an ASCII case-insensitive match for the attribute's canonical name,
 * with no leading or trailing whitespace.
 *
 * Note: The values `"true"` and `"false"` are not allowed on boolean attributes.
 * To represent a `false` value, the attribute has to be omitted altogether.
 *
 * @see https://html.spec.whatwg.org/#boolean-attributes
 * @see https://html.spec.whatwg.org/#attributes-3
 */
var HTML_BOOLEAN_ATTRIBUTES = freeze({
	allowfullscreen: true,
	async: true,
	autofocus: true,
	autoplay: true,
	checked: true,
	controls: true,
	default: true,
	defer: true,
	disabled: true,
	formnovalidate: true,
	hidden: true,
	ismap: true,
	itemscope: true,
	loop: true,
	multiple: true,
	muted: true,
	nomodule: true,
	novalidate: true,
	open: true,
	playsinline: true,
	readonly: true,
	required: true,
	reversed: true,
	selected: true,
});

/**
 * Check if `name` is matching one of the HTML boolean attribute names.
 * This method doesn't check if such attributes are allowed in the context of the current
 * document/parsing.
 *
 * @param {string} name
 * @returns {boolean}
 * @see {@link HTML_BOOLEAN_ATTRIBUTES}
 * @see https://html.spec.whatwg.org/#boolean-attributes
 * @see https://html.spec.whatwg.org/#attributes-3
 */
function isHTMLBooleanAttribute(name) {
	return hasOwn(HTML_BOOLEAN_ATTRIBUTES, name.toLowerCase());
}

/**
 * Void elements only have a start tag; end tags must not be specified for void elements.
 * These elements should be written as self-closing like this: `<area />`.
 * This should not be confused with optional tags that HTML allows to omit the end tag for
 * (like `li`, `tr` and others), which can have content after them,
 * so they can not be written as self-closing.
 * xmldom does not have any logic for optional end tags cases,
 * and will report them as a warning.
 * Content that would go into the unopened element,
 * will instead be added as a sibling text node.
 *
 * @type {Readonly<{
 * 	area: boolean;
 * 	col: boolean;
 * 	img: boolean;
 * 	wbr: boolean;
 * 	link: boolean;
 * 	hr: boolean;
 * 	source: boolean;
 * 	br: boolean;
 * 	input: boolean;
 * 	param: boolean;
 * 	meta: boolean;
 * 	embed: boolean;
 * 	track: boolean;
 * 	base: boolean;
 * }>}
 * @see https://html.spec.whatwg.org/#void-elements
 * @see https://html.spec.whatwg.org/#optional-tags
 */
var HTML_VOID_ELEMENTS = freeze({
	area: true,
	base: true,
	br: true,
	col: true,
	embed: true,
	hr: true,
	img: true,
	input: true,
	link: true,
	meta: true,
	param: true,
	source: true,
	track: true,
	wbr: true,
});

/**
 * Check if `tagName` is matching one of the HTML void element names.
 * This method doesn't check if such tags are allowed in the context of the current
 * document/parsing.
 *
 * @param {string} tagName
 * @returns {boolean}
 * @see {@link HTML_VOID_ELEMENTS}
 * @see https://html.spec.whatwg.org/#void-elements
 */
function isHTMLVoidElement(tagName) {
	return hasOwn(HTML_VOID_ELEMENTS, tagName.toLowerCase());
}

/**
 * Tag names that are raw text elements according to HTML spec.
 * The value denotes whether they are escapable or not.
 *
 * @see {@link isHTMLEscapableRawTextElement}
 * @see {@link isHTMLRawTextElement}
 * @see https://html.spec.whatwg.org/#raw-text-elements
 * @see https://html.spec.whatwg.org/#escapable-raw-text-elements
 */
var HTML_RAW_TEXT_ELEMENTS = freeze({
	script: false,
	style: false,
	textarea: true,
	title: true,
});

/**
 * Check if `tagName` is matching one of the HTML raw text element names.
 * This method doesn't check if such tags are allowed in the context of the current
 * document/parsing.
 *
 * @param {string} tagName
 * @returns {boolean}
 * @see {@link isHTMLEscapableRawTextElement}
 * @see {@link HTML_RAW_TEXT_ELEMENTS}
 * @see https://html.spec.whatwg.org/#raw-text-elements
 * @see https://html.spec.whatwg.org/#escapable-raw-text-elements
 */
function isHTMLRawTextElement(tagName) {
	var key = tagName.toLowerCase();
	return hasOwn(HTML_RAW_TEXT_ELEMENTS, key) && !HTML_RAW_TEXT_ELEMENTS[key];
}
/**
 * Check if `tagName` is matching one of the HTML escapable raw text element names.
 * This method doesn't check if such tags are allowed in the context of the current
 * document/parsing.
 *
 * @param {string} tagName
 * @returns {boolean}
 * @see {@link isHTMLRawTextElement}
 * @see {@link HTML_RAW_TEXT_ELEMENTS}
 * @see https://html.spec.whatwg.org/#raw-text-elements
 * @see https://html.spec.whatwg.org/#escapable-raw-text-elements
 */
function isHTMLEscapableRawTextElement(tagName) {
	var key = tagName.toLowerCase();
	return hasOwn(HTML_RAW_TEXT_ELEMENTS, key) && HTML_RAW_TEXT_ELEMENTS[key];
}
/**
 * Only returns true if `value` matches MIME_TYPE.HTML, which indicates an HTML document.
 *
 * @param {string} mimeType
 * @returns {mimeType is 'text/html'}
 * @see https://www.iana.org/assignments/media-types/text/html
 * @see https://en.wikipedia.org/wiki/HTML
 * @see https://developer.mozilla.org/en-US/docs/Web/API/DOMParser/parseFromString
 * @see https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#dom-domparser-parsefromstring
 */
function isHTMLMimeType(mimeType) {
	return mimeType === MIME_TYPE.HTML;
}
/**
 * For both the `text/html` and the `application/xhtml+xml` namespace the spec defines that the
 * HTML namespace is provided as the default.
 *
 * @param {string} mimeType
 * @returns {boolean}
 * @see https://dom.spec.whatwg.org/#dom-document-createelement
 * @see https://dom.spec.whatwg.org/#dom-domimplementation-createdocument
 * @see https://dom.spec.whatwg.org/#dom-domimplementation-createhtmldocument
 */
function hasDefaultHTMLNamespace(mimeType) {
	return isHTMLMimeType(mimeType) || mimeType === MIME_TYPE.XML_XHTML_APPLICATION;
}

/**
 * All mime types that are allowed as input to `DOMParser.parseFromString`
 *
 * @see https://developer.mozilla.org/en-US/docs/Web/API/DOMParser/parseFromString#Argument02
 *      MDN
 * @see https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#domparsersupportedtype
 *      WHATWG HTML Spec
 * @see {@link DOMParser.prototype.parseFromString}
 */
var MIME_TYPE = freeze({
	/**
	 * `text/html`, the only mime type that triggers treating an XML document as HTML.
	 *
	 * @see https://www.iana.org/assignments/media-types/text/html IANA MimeType registration
	 * @see https://en.wikipedia.org/wiki/HTML Wikipedia
	 * @see https://developer.mozilla.org/en-US/docs/Web/API/DOMParser/parseFromString MDN
	 * @see https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#dom-domparser-parsefromstring
	 *      WHATWG HTML Spec
	 */
	HTML: 'text/html',

	/**
	 * `application/xml`, the standard mime type for XML documents.
	 *
	 * @see https://www.iana.org/assignments/media-types/application/xml IANA MimeType
	 *      registration
	 * @see https://tools.ietf.org/html/rfc7303#section-9.1 RFC 7303
	 * @see https://en.wikipedia.org/wiki/XML_and_MIME Wikipedia
	 */
	XML_APPLICATION: 'application/xml',

	/**
	 * `text/html`, an alias for `application/xml`.
	 *
	 * @see https://tools.ietf.org/html/rfc7303#section-9.2 RFC 7303
	 * @see https://www.iana.org/assignments/media-types/text/xml IANA MimeType registration
	 * @see https://en.wikipedia.org/wiki/XML_and_MIME Wikipedia
	 */
	XML_TEXT: 'text/xml',

	/**
	 * `application/xhtml+xml`, indicates an XML document that has the default HTML namespace,
	 * but is parsed as an XML document.
	 *
	 * @see https://www.iana.org/assignments/media-types/application/xhtml+xml IANA MimeType
	 *      registration
	 * @see https://dom.spec.whatwg.org/#dom-domimplementation-createdocument WHATWG DOM Spec
	 * @see https://en.wikipedia.org/wiki/XHTML Wikipedia
	 */
	XML_XHTML_APPLICATION: 'application/xhtml+xml',

	/**
	 * `image/svg+xml`,
	 *
	 * @see https://www.iana.org/assignments/media-types/image/svg+xml IANA MimeType registration
	 * @see https://www.w3.org/TR/SVG11/ W3C SVG 1.1
	 * @see https://en.wikipedia.org/wiki/Scalable_Vector_Graphics Wikipedia
	 */
	XML_SVG_IMAGE: 'image/svg+xml',
});
/**
 * @typedef {'application/xhtml+xml' | 'application/xml' | 'image/svg+xml' | 'text/html' | 'text/xml'}
 * MimeType
 */
/**
 * @type {MimeType[]}
 * @private
 * Basically `Object.values`, which is not available in ES5.
 */
var _MIME_TYPES = Object.keys(MIME_TYPE).map(function (key) {
	return MIME_TYPE[key];
});

/**
 * Only returns true if `mimeType` is one of the allowed values for
 * `DOMParser.parseFromString`.
 *
 * @param {string} mimeType
 * @returns {mimeType is 'application/xhtml+xml' | 'application/xml' | 'image/svg+xml' |  'text/html' | 'text/xml'}
 *
 */
function isValidMimeType(mimeType) {
	return _MIME_TYPES.indexOf(mimeType) > -1;
}
/**
 * Namespaces that are used in this code base.
 *
 * @see http://www.w3.org/TR/REC-xml-names
 */
var NAMESPACE = freeze({
	/**
	 * The XHTML namespace.
	 *
	 * @see http://www.w3.org/1999/xhtml
	 */
	HTML: 'http://www.w3.org/1999/xhtml',

	/**
	 * The SVG namespace.
	 *
	 * @see http://www.w3.org/2000/svg
	 */
	SVG: 'http://www.w3.org/2000/svg',

	/**
	 * The `xml:` namespace.
	 *
	 * @see http://www.w3.org/XML/1998/namespace
	 */
	XML: 'http://www.w3.org/XML/1998/namespace',

	/**
	 * The `xmlns:` namespace.
	 *
	 * @see https://www.w3.org/2000/xmlns/
	 */
	XMLNS: 'http://www.w3.org/2000/xmlns/',
});

exports.assign = assign;
exports.find = find;
exports.freeze = freeze;
exports.HTML_BOOLEAN_ATTRIBUTES = HTML_BOOLEAN_ATTRIBUTES;
exports.HTML_RAW_TEXT_ELEMENTS = HTML_RAW_TEXT_ELEMENTS;
exports.HTML_VOID_ELEMENTS = HTML_VOID_ELEMENTS;
exports.hasDefaultHTMLNamespace = hasDefaultHTMLNamespace;
exports.hasOwn = hasOwn;
exports.isHTMLBooleanAttribute = isHTMLBooleanAttribute;
exports.isHTMLRawTextElement = isHTMLRawTextElement;
exports.isHTMLEscapableRawTextElement = isHTMLEscapableRawTextElement;
exports.isHTMLMimeType = isHTMLMimeType;
exports.isHTMLVoidElement = isHTMLVoidElement;
exports.isValidMimeType = isValidMimeType;
exports.MIME_TYPE = MIME_TYPE;
exports.NAMESPACE = NAMESPACE;