import Document from '../nodes/document/Document.js';
import * as PropertySymbol from '../PropertySymbol.js';
import NamespaceURI from '../config/NamespaceURI.js';
import HTMLElementConfig from '../config/HTMLElementConfig.js';
import HTMLElementConfigContentModelEnum from '../config/HTMLElementConfigContentModelEnum.js';
import SVGElementConfig from '../config/SVGElementConfig.js';
import StringUtility from '../utilities/StringUtility.js';
import XMLEncodeUtility from '../utilities/XMLEncodeUtility.js';
import NodeTypeEnum from '../nodes/node/NodeTypeEnum.js';
import NodeFactory from '../nodes/NodeFactory.js';
/**
 * Markup RegExp.
 *
 * Group 1: Beginning of start tag (e.g. "div" in "<div").
 * Group 2: End tag (e.g. "div" in "</div>").
 * Group 3: Comment start tag "<!--"
 * Group 4: Comment end tag "-->"
 * Group 5: Document type start tag "<!"
 * Group 6: Processing instruction start tag "<?"
 * Group 7: End of self closing start tag (e.g. "/>" in "<img/>").
 * Group 8: End of start tag or comment tag (e.g. ">" in "<div>").
 */
const MARKUP_REGEXP = /<([^\s/!>?]+)|<\/([^\s/!>?]+)\s*>|(<!--)|(-->|--!>)|(<!)|(<\?)|(\/>)|(>)/gm;
/**
 * Attribute RegExp.
 *
 * Group 1: Attribute name when the attribute has a value with no apostrophes (e.g. "name" in "<div name=value>").
 * Group 2: Attribute value when the attribute has a value with no apostrophes (e.g. "value" in "<div name="value">").
 * Group 3: Attribute name when the attribute has a value using double apostrophe (e.g. "name" in "<div name="value">").
 * Group 4: Attribute value when the attribute has a value using double apostrophe (e.g. "value" in "<div name="value">").
 * Group 5: Attribute end apostrophe when the attribute has a value using double apostrophe (e.g. '"' in "<div name="value">").
 * Group 6: Attribute name when the attribute has a value using single apostrophe (e.g. "name" in "<div name='value'>").
 * Group 7: Attribute value when the attribute has a value using single apostrophe (e.g. "value" in "<div name='value'>").
 * Group 8: Attribute end apostrophe when the attribute has a value using single apostrophe (e.g. "'" in "<div name='value'>").
 * Group 9: Attribute name when the attribute has no value (e.g. "disabled" in "<div disabled>").
 */
const ATTRIBUTE_REGEXP = /\s*([a-zA-Z0-9-_:.$@?\\<\[\]]+)\s*=\s*([^"'=<>\\`\s]+)|\s*([a-zA-Z0-9-_:.$@?\\<\[\]]+)\s*=\s*"([^"]*)("{0,1})|\s*([a-zA-Z0-9-_:.$@?\\<\[\]]+)\s*=\s*'([^']*)('{0,1})|\s*([a-zA-Z0-9-_:.$@?\\<\[\]]+)/gm;
/**
 * Document type attribute RegExp.
 *
 * Group 1: Attribute value.
 */
const DOCUMENT_TYPE_ATTRIBUTE_REGEXP = /"([^"]+)"/gm;
/**
 * Space RegExp.
 */
const SPACE_REGEXP = /\s+/;
/**
 * Space in the beginning of string RegExp.
 */
const SPACE_IN_BEGINNING_REGEXP = /^\s+/;
/**
 * Markup read state (which state the parser is in).
 */
var MarkupReadStateEnum;
(function (MarkupReadStateEnum) {
    MarkupReadStateEnum["any"] = "any";
    MarkupReadStateEnum["startTag"] = "startTag";
    MarkupReadStateEnum["comment"] = "comment";
    MarkupReadStateEnum["documentType"] = "documentType";
    MarkupReadStateEnum["processingInstruction"] = "processingInstruction";
    MarkupReadStateEnum["rawTextElement"] = "rawTextElement";
})(MarkupReadStateEnum || (MarkupReadStateEnum = {}));
/**
 * How much of the HTML document that has been parsed (where the parser level is).
 */
var HTMLDocumentStructureLevelEnum;
(function (HTMLDocumentStructureLevelEnum) {
    HTMLDocumentStructureLevelEnum[HTMLDocumentStructureLevelEnum["root"] = 0] = "root";
    HTMLDocumentStructureLevelEnum[HTMLDocumentStructureLevelEnum["doctype"] = 1] = "doctype";
    HTMLDocumentStructureLevelEnum[HTMLDocumentStructureLevelEnum["documentElement"] = 2] = "documentElement";
    HTMLDocumentStructureLevelEnum[HTMLDocumentStructureLevelEnum["head"] = 3] = "head";
    HTMLDocumentStructureLevelEnum[HTMLDocumentStructureLevelEnum["additionalHeadWithoutBody"] = 4] = "additionalHeadWithoutBody";
    HTMLDocumentStructureLevelEnum[HTMLDocumentStructureLevelEnum["body"] = 5] = "body";
    HTMLDocumentStructureLevelEnum[HTMLDocumentStructureLevelEnum["afterBody"] = 6] = "afterBody";
})(HTMLDocumentStructureLevelEnum || (HTMLDocumentStructureLevelEnum = {}));
/**
 * HTML parser.
 */
export default class HTMLParser {
    window;
    evaluateScripts = false;
    rootNode = null;
    rootDocument = null;
    nodeStack = [];
    tagNameStack = [];
    documentStructure = null;
    startTagIndex = 0;
    markupRegExp = null;
    nextElement = null;
    currentNode = null;
    readState = MarkupReadStateEnum.any;
    /**
     * Constructor.
     *
     * @param window Window.
     * @param [options] Options.
     * @param [options.evaluateScripts] Set to "true" to enable script execution
     */
    constructor(window, options) {
        this.window = window;
        if (options?.evaluateScripts) {
            this.evaluateScripts = true;
        }
    }
    /**
     * Parses HTML a root element containing nodes found.
     *
     * @param html HTML string.
     * @param [rootNode] Root node.
     * @returns Root node.
     */
    parse(html, rootNode) {
        this.rootNode = rootNode || this.window.document.createDocumentFragment();
        this.rootDocument = this.rootNode instanceof Document ? this.rootNode : this.window.document;
        this.nodeStack = [this.rootNode];
        this.tagNameStack = [null];
        this.currentNode = this.rootNode;
        this.readState = MarkupReadStateEnum.any;
        this.documentStructure = null;
        this.startTagIndex = 0;
        this.markupRegExp = new RegExp(MARKUP_REGEXP, 'gm');
        if (this.rootNode instanceof Document) {
            const { doctype, documentElement, head, body } = this.rootNode;
            if (!documentElement || !head || !body) {
                throw new Error('Failed to parse HTML: The root node must have "documentElement", "head" and "body".\n\nWe should not end up here and it is therefore a bug in Happy DOM. Please report this issue.');
            }
            this.documentStructure = {
                nodes: {
                    doctype: doctype || null,
                    documentElement,
                    head,
                    body
                },
                level: HTMLDocumentStructureLevelEnum.root
            };
        }
        if (this.rootNode instanceof this.window.HTMLHtmlElement) {
            const head = this.rootDocument.createElement('head');
            const body = this.rootDocument.createElement('body');
            while (this.rootNode[PropertySymbol.nodeArray].length > 0) {
                this.rootNode[PropertySymbol.removeChild](this.rootNode[PropertySymbol.nodeArray][this.rootNode[PropertySymbol.nodeArray].length - 1]);
            }
            this.rootNode[PropertySymbol.appendChild](head);
            this.rootNode[PropertySymbol.appendChild](body);
            this.documentStructure = {
                nodes: {
                    doctype: null,
                    documentElement: this.rootNode,
                    head,
                    body
                },
                level: HTMLDocumentStructureLevelEnum.documentElement
            };
        }
        let match;
        let lastIndex = 0;
        html = String(html);
        while ((match = this.markupRegExp.exec(html))) {
            switch (this.readState) {
                case MarkupReadStateEnum.any:
                    // Plain text between tags.
                    if (match.index !== lastIndex &&
                        (match[1] || match[2] || match[3] || match[4] || match[5] !== undefined || match[6])) {
                        this.parsePlainText(html.substring(lastIndex, match.index));
                    }
                    if (match[1]) {
                        // Start tag.
                        this.nextElement = this.getStartTagElement(match[1]);
                        this.startTagIndex = this.markupRegExp.lastIndex;
                        this.readState = MarkupReadStateEnum.startTag;
                    }
                    else if (match[2]) {
                        // End tag.
                        this.parseEndTag(match[2]);
                    }
                    else if (match[3]) {
                        // Comment.
                        this.startTagIndex = this.markupRegExp.lastIndex;
                        this.readState = MarkupReadStateEnum.comment;
                    }
                    else if (match[5] !== undefined) {
                        // Document type.
                        this.startTagIndex = this.markupRegExp.lastIndex;
                        this.readState = MarkupReadStateEnum.documentType;
                    }
                    else if (match[6]) {
                        // Processing instruction.
                        this.startTagIndex = this.markupRegExp.lastIndex;
                        this.readState = MarkupReadStateEnum.processingInstruction;
                    }
                    else {
                        // Plain text between tags, including the matched tag as it is not a valid start or end tag.
                        this.parsePlainText(html.substring(lastIndex, this.markupRegExp.lastIndex));
                    }
                    break;
                case MarkupReadStateEnum.startTag:
                    // End of start tag
                    // match[2] is matching an end tag in case the start tag wasn't closed (e.g. "<div\n</ul>" instead of "<div>\n</ul>").
                    // match[7] is matching "/>" (e.g. "<img/>").
                    // match[8] is matching ">" (e.g. "<div>").
                    if (match[7] || match[8] || match[2]) {
                        if (this.nextElement) {
                            const attributeString = html.substring(this.startTagIndex, match[2] ? this.markupRegExp.lastIndex - 1 : match.index);
                            const isSelfClosed = !!match[7];
                            this.parseEndOfStartTag(attributeString, isSelfClosed);
                        }
                        else {
                            // If "nextElement" is set to null, the tag is not allowed (<html>, <head> and <body> are not allowed in an HTML fragment or to be nested).
                            this.readState = MarkupReadStateEnum.any;
                        }
                    }
                    break;
                case MarkupReadStateEnum.comment:
                    // Comment end tag.
                    if (match[4]) {
                        this.parseComment(html.substring(this.startTagIndex, match.index));
                    }
                    break;
                case MarkupReadStateEnum.documentType:
                    // Document type end tag.
                    if (match[7] || match[8]) {
                        this.parseDocumentType(html.substring(this.startTagIndex, match.index));
                    }
                    break;
                case MarkupReadStateEnum.processingInstruction:
                    // Processing instruction end tag.
                    if (match[7] || match[8]) {
                        // Processing instructions are not supported in HTML and are rendered as comments.
                        this.parseComment('?' + html.substring(this.startTagIndex, match.index));
                    }
                    break;
                case MarkupReadStateEnum.rawTextElement:
                    // End tag of raw text content.
                    // <script> and <style> elements are raw text elements.
                    if (match[2]) {
                        this.parseRawTextElementContent(match[2], html.substring(this.startTagIndex, match.index));
                    }
                    break;
            }
            lastIndex = this.markupRegExp.lastIndex;
        }
        // Plain text after tags.
        if (lastIndex !== html.length && this.currentNode) {
            this.parsePlainText(html.substring(lastIndex));
        }
        return this.rootNode;
    }
    /**
     * Parses plain text.
     *
     * @param text Text.
     */
    parsePlainText(text) {
        if (this.documentStructure) {
            const level = this.documentStructure.level;
            const { documentElement, head, body } = this.documentStructure.nodes;
            // We should remove space in beginning inside the document and the <html> tag.
            const htmlText = (this.currentNode === this.rootNode || this.currentNode === documentElement) &&
                level < HTMLDocumentStructureLevelEnum.head &&
                body[PropertySymbol.elementArray].length === 0
                ? text.replace(SPACE_IN_BEGINNING_REGEXP, '')
                : text;
            if (htmlText) {
                const textNode = this.rootDocument.createTextNode(XMLEncodeUtility.decodeHTMLEntities(htmlText));
                if (this.currentNode === head &&
                    level === HTMLDocumentStructureLevelEnum.additionalHeadWithoutBody) {
                    documentElement[PropertySymbol.insertBefore](textNode, body, true);
                }
                else if (this.currentNode === this.rootNode ||
                    this.currentNode === documentElement ||
                    (this.currentNode === head && level >= HTMLDocumentStructureLevelEnum.body)) {
                    if (level === HTMLDocumentStructureLevelEnum.head) {
                        // Space between <head> and <body> is allowed
                        documentElement[PropertySymbol.insertBefore](textNode, body, true);
                    }
                    else if (body.lastChild?.[PropertySymbol.nodeType] === NodeTypeEnum.textNode) {
                        // If the last child of the body is a text node, we should append the text to it.
                        body.lastChild[PropertySymbol.data] += text;
                    }
                    else {
                        // Nodes outside <html>, <head> and <body> should be appended to the body
                        body[PropertySymbol.appendChild](textNode, true);
                    }
                }
                else {
                    this.currentNode[PropertySymbol.appendChild](textNode, true);
                }
            }
        }
        else {
            const textNode = this.rootDocument.createTextNode(XMLEncodeUtility.decodeHTMLEntities(text));
            this.currentNode[PropertySymbol.appendChild](textNode, true);
        }
    }
    /**
     * Parses end of start tag.
     *
     * @param attributeString Attribute string.
     * @param isSelfClosed Is self closed.
     */
    parseEndOfStartTag(attributeString, isSelfClosed) {
        if (attributeString &&
            (!this.documentStructure ||
                this.nextElement !== this.documentStructure.nodes.head ||
                this.documentStructure.level < HTMLDocumentStructureLevelEnum.body)) {
            const attributeRegexp = new RegExp(ATTRIBUTE_REGEXP, 'gm');
            let attributeMatch;
            while ((attributeMatch = attributeRegexp.exec(attributeString))) {
                if ((attributeMatch[1] && attributeMatch[2]) ||
                    (attributeMatch[3] && attributeMatch[5] === '"') ||
                    (attributeMatch[6] && attributeMatch[8] === "'") ||
                    attributeMatch[9]) {
                    // Valid attribute name and value.
                    const name = attributeMatch[1] || attributeMatch[3] || attributeMatch[6] || attributeMatch[9] || '';
                    const rawValue = attributeMatch[2] || attributeMatch[4] || attributeMatch[7] || '';
                    const value = rawValue ? XMLEncodeUtility.decodeHTMLAttributeValue(rawValue) : '';
                    const attributes = this.nextElement[PropertySymbol.attributes];
                    if (this.nextElement[PropertySymbol.namespaceURI] === NamespaceURI.svg) {
                        const nameParts = name.split(':');
                        let namespaceURI = null;
                        // In the SVG namespace, the attribute "xmlns" should be set to the "http://www.w3.org/2000/xmlns/" namespace and "xlink" to the "http://www.w3.org/1999/xlink" namespace.
                        switch (nameParts[0]) {
                            case 'xmlns':
                                namespaceURI =
                                    !nameParts[1] || nameParts[1] === 'xlink' ? NamespaceURI.xmlns : null;
                                break;
                            case 'xlink':
                                namespaceURI = NamespaceURI.xlink;
                                break;
                        }
                        if (!attributes.getNamedItemNS(namespaceURI, nameParts[1] ?? name)) {
                            const attribute = NodeFactory.createNode(this.rootDocument, this.window.Attr);
                            attribute[PropertySymbol.namespaceURI] = namespaceURI;
                            attribute[PropertySymbol.name] = name;
                            attribute[PropertySymbol.localName] =
                                namespaceURI && nameParts[1] ? nameParts[1] : name;
                            attribute[PropertySymbol.prefix] = namespaceURI && nameParts[1] ? nameParts[0] : null;
                            attribute[PropertySymbol.value] = value;
                            attributes[PropertySymbol.setNamedItem](attribute);
                        }
                    }
                    else if (!attributes.getNamedItem(name)) {
                        const attributeItem = this.rootDocument.createAttribute(name);
                        attributeItem[PropertySymbol.value] = value;
                        attributes[PropertySymbol.setNamedItem](attributeItem);
                    }
                    this.startTagIndex += attributeMatch[0].length;
                }
                else if (!attributeMatch[1] &&
                    ((attributeMatch[3] && !attributeMatch[5]) || (attributeMatch[6] && !attributeMatch[8]))) {
                    // End attribute apostrophe is missing (e.g. "attr='value" or 'attr="value').
                    // We should continue to the next end of start tag match.
                    return;
                }
            }
        }
        const tagName = this.nextElement[PropertySymbol.tagName];
        const lowerTagName = tagName.toLowerCase();
        const config = HTMLElementConfig[lowerTagName];
        let previousCurrentNode = null;
        while (previousCurrentNode !== this.rootNode) {
            const parentLowerTagName = this.currentNode[PropertySymbol.tagName]?.toLowerCase();
            const parentConfig = HTMLElementConfig[parentLowerTagName];
            if (previousCurrentNode === this.currentNode) {
                throw new Error('Failed to parse HTML: The parser is stuck in an infinite loop. Please report this issue.');
            }
            previousCurrentNode = this.currentNode;
            // Some elements are not allowed to be nested (e.g. "<a><a></a></a>" is not allowed.).
            // Therefore we need to auto-close tags with the same name matching the config, so that it become valid (e.g. "<a></a><a></a>").
            if ((config?.contentModel === HTMLElementConfigContentModelEnum.noFirstLevelSelfDescendants &&
                this.tagNameStack[this.tagNameStack.length - 1] === tagName) ||
                parentConfig?.contentModel === HTMLElementConfigContentModelEnum.textOrComments ||
                (parentConfig?.contentModel ===
                    HTMLElementConfigContentModelEnum.noForbiddenFirstLevelDescendants &&
                    parentConfig?.forbiddenDescendants?.includes(lowerTagName)) ||
                (parentConfig?.contentModel === HTMLElementConfigContentModelEnum.permittedDescendants &&
                    !parentConfig?.permittedDescendants?.includes(lowerTagName) &&
                    (!config ||
                        !config.addPermittedParent ||
                        (HTMLElementConfig[config.addPermittedParent].permittedParents &&
                            !HTMLElementConfig[config.addPermittedParent].permittedParents.includes(parentLowerTagName)) ||
                        (HTMLElementConfig[config.addPermittedParent].permittedDescendants &&
                            !HTMLElementConfig[config.addPermittedParent].permittedDescendants.includes(lowerTagName))))) {
                // We need to move forbidden elements inside <table> outside of the table if possible.
                // E.g. "<table><div><tr><td></td></tr></div></table>"" should become "<div></div><table><tbody><tr><td></td></tr></tbody></table>" (<tbody> is added as <tr> has addPermittedParent as config).
                if (parentConfig?.contentModel === HTMLElementConfigContentModelEnum.permittedDescendants &&
                    parentConfig.moveForbiddenDescendant &&
                    !parentConfig.moveForbiddenDescendant.exclude.includes(lowerTagName)) {
                    // We add the element before the first element that is not forbidden.
                    let before = this.currentNode;
                    while (before) {
                        if (!before.parentNode ||
                            !HTMLElementConfig[before.parentNode[PropertySymbol.localName]]
                                ?.permittedDescendants ||
                            HTMLElementConfig[before.parentNode[PropertySymbol.localName]]?.permittedDescendants?.includes(lowerTagName)) {
                            break;
                        }
                        else {
                            before = before.parentNode;
                        }
                    }
                    if (before && before.parentNode) {
                        before.parentNode.insertBefore(this.nextElement, before);
                    }
                    else {
                        // If there is no element that is not forbidden, we append the element
                        before.appendChild(this.nextElement);
                    }
                    this.startTagIndex = this.markupRegExp.lastIndex;
                    this.readState = MarkupReadStateEnum.any;
                    return;
                }
                // This will close the current node
                // E.g. "<a><a></a></a>" will become "<a></a><a></a>"
                this.nodeStack.pop();
                this.tagNameStack.pop();
                this.currentNode = this.nodeStack[this.nodeStack.length - 1] || this.rootNode;
            }
            else if (config?.contentModel === HTMLElementConfigContentModelEnum.noSelfDescendants &&
                this.tagNameStack.includes(tagName)) {
                while (this.currentNode !== this.rootNode) {
                    if (this.currentNode[PropertySymbol.tagName] === tagName) {
                        this.nodeStack.pop();
                        this.tagNameStack.pop();
                        this.currentNode = this.nodeStack[this.nodeStack.length - 1] || this.rootNode;
                        break;
                    }
                    this.nodeStack.pop();
                    this.tagNameStack.pop();
                    this.currentNode = this.nodeStack[this.nodeStack.length - 1] || this.rootNode;
                }
            }
            else if (config?.permittedParents &&
                !config.permittedParents.includes(parentLowerTagName)) {
                // <thead>, <tbody> and <tfoot> are only allowed as children of <table>.
                // <tr> is only allowed as a child of <table>, <thead>, <tbody> and <tfoot>.
                // <tbody> should be added automatically when <tr> is added directly to the table.
                if (!config.addPermittedParent ||
                    (HTMLElementConfig[config.addPermittedParent].permittedParents &&
                        !HTMLElementConfig[config.addPermittedParent].permittedParents.includes(parentLowerTagName)) ||
                    (HTMLElementConfig[config.addPermittedParent].permittedDescendants &&
                        !HTMLElementConfig[config.addPermittedParent].permittedDescendants.includes(lowerTagName))) {
                    this.readState = MarkupReadStateEnum.any;
                    this.startTagIndex = this.markupRegExp.lastIndex;
                    return;
                }
                const permittedParent = this.rootDocument.createElement(config.addPermittedParent);
                this.currentNode[PropertySymbol.appendChild](permittedParent, true);
                this.nodeStack.push(permittedParent);
                this.tagNameStack.push(permittedParent[PropertySymbol.tagName]);
                this.currentNode = permittedParent;
            }
            else {
                break;
            }
        }
        // Appends the new element to its parent
        if (this.documentStructure) {
            const { documentElement, head, body } = this.documentStructure.nodes;
            const level = this.documentStructure.level;
            // Appends the new node to its parent and sets is as current node.
            // Raw text elements (e.g. <script>) should be appended after the raw text has been added as content to the element.
            // <html>, <head> and <body> are special elements with context constraints. They are already available in the document.
            if ((!config || config.contentModel !== HTMLElementConfigContentModelEnum.rawText) &&
                this.nextElement !== documentElement &&
                this.nextElement !== head &&
                this.nextElement !== body) {
                // When parser mode is "htmlDocument", any element added directly to the document or document element should be added to the body.
                if (documentElement &&
                    (this.currentNode === this.rootNode ||
                        this.currentNode === documentElement ||
                        (this.currentNode === head && level >= HTMLDocumentStructureLevelEnum.body))) {
                    if (level < HTMLDocumentStructureLevelEnum.body) {
                        this.documentStructure.level = HTMLDocumentStructureLevelEnum.afterBody;
                    }
                    body[PropertySymbol.appendChild](this.nextElement, true);
                }
                else {
                    this.currentNode[PropertySymbol.appendChild](this.nextElement, true);
                }
            }
        }
        else {
            this.currentNode[PropertySymbol.appendChild](this.nextElement, true);
        }
        // Sets the new element as the current node.
        if (!this.documentStructure ||
            this.nextElement !== this.documentStructure.nodes.body ||
            this.documentStructure.level <= HTMLDocumentStructureLevelEnum.body) {
            this.currentNode = this.nextElement;
            this.nodeStack.push(this.currentNode);
            this.tagNameStack.push(tagName);
            if (this.documentStructure && this.nextElement === this.documentStructure.nodes.body) {
                this.documentStructure.level = HTMLDocumentStructureLevelEnum.afterBody;
            }
            // Check if the tag is a void element and should be closed immediately.
            // Elements in the SVG namespace can be self-closed (e.g. "/>").
            // "/>" will be ignored in the HTML namespace.
            if (config?.contentModel === HTMLElementConfigContentModelEnum.noDescendants ||
                (isSelfClosed &&
                    this.currentNode[PropertySymbol.namespaceURI] === NamespaceURI.svg)) {
                this.nodeStack.pop();
                this.tagNameStack.pop();
                this.currentNode = this.nodeStack[this.nodeStack.length - 1] || this.rootNode;
                this.readState = MarkupReadStateEnum.any;
            }
            else {
                // We will set the read state to "rawText" for raw text elements such as <script> and <style> elements.
                this.readState =
                    config?.contentModel === HTMLElementConfigContentModelEnum.rawText
                        ? MarkupReadStateEnum.rawTextElement
                        : MarkupReadStateEnum.any;
            }
        }
        else {
            this.readState = MarkupReadStateEnum.any;
        }
        this.startTagIndex = this.markupRegExp.lastIndex;
    }
    /**
     * Parses end tag.
     *
     * @param tagName Tag name.
     */
    parseEndTag(tagName) {
        // SVG elements are case-sensitive.
        const name = this.currentNode[PropertySymbol.namespaceURI] === NamespaceURI.html
            ? StringUtility.asciiUpperCase(tagName)
            : SVGElementConfig[StringUtility.asciiLowerCase(tagName)]?.localName || tagName;
        const index = this.tagNameStack.lastIndexOf(name);
        // We close all tags up until the first tag that matches the end tag.
        if (index !== -1) {
            this.nodeStack.splice(index, this.nodeStack.length - index);
            this.tagNameStack.splice(index, this.tagNameStack.length - index);
            this.currentNode = this.nodeStack[this.nodeStack.length - 1] || this.rootNode;
        }
    }
    /**
     * Parses comment.
     *
     * @param comment Comment.
     */
    parseComment(comment) {
        const commentNode = this.rootDocument.createComment(XMLEncodeUtility.decodeHTMLEntities(comment));
        if (this.documentStructure) {
            const level = this.documentStructure.level;
            const { documentElement, head, body } = this.documentStructure.nodes;
            // We need to add the comment node to the correct position in the document.
            let beforeNode = null;
            if (this.currentNode === this.rootNode && level === HTMLDocumentStructureLevelEnum.root) {
                beforeNode = documentElement;
            }
            else if (this.currentNode === documentElement &&
                level === HTMLDocumentStructureLevelEnum.documentElement) {
                beforeNode = head;
            }
            else if (this.currentNode === documentElement &&
                level === HTMLDocumentStructureLevelEnum.head) {
                beforeNode = body;
            }
            this.currentNode[PropertySymbol.insertBefore](commentNode, beforeNode, true);
        }
        else {
            this.currentNode[PropertySymbol.appendChild](commentNode, true);
        }
        this.readState = MarkupReadStateEnum.any;
    }
    /**
     * Parses document type.
     *
     * @param text Text.
     */
    parseDocumentType(text) {
        const decodedText = XMLEncodeUtility.decodeHTMLEntities(text);
        if (this.documentStructure) {
            let { doctype } = this.documentStructure.nodes;
            const documentType = this.getDocumentType(decodedText);
            // Document type nodes are only allowed at the beginning of the document.
            if (documentType) {
                if (this.currentNode === this.rootNode &&
                    this.documentStructure.level === HTMLDocumentStructureLevelEnum.root) {
                    if (doctype) {
                        doctype[PropertySymbol.name] = documentType.name;
                        doctype[PropertySymbol.publicId] = documentType.publicId;
                        doctype[PropertySymbol.systemId] = documentType.systemId;
                    }
                    else {
                        doctype = this.rootNode.implementation.createDocumentType(documentType.name, documentType.publicId, documentType.systemId);
                        this.rootNode.insertBefore(doctype, this.rootNode.documentElement);
                    }
                    this.documentStructure.level = HTMLDocumentStructureLevelEnum.doctype;
                }
            }
            else {
                this.parseComment(decodedText);
            }
        }
        else {
            // Document type nodes are only allowed at the beginning of the document.
            if (!this.getDocumentType(decodedText)) {
                this.parseComment(decodedText);
            }
        }
        this.readState = MarkupReadStateEnum.any;
    }
    /**
     * Parses raw text content for elements such as <script> and <style>.
     *
     * @param tagName End tag name.
     * @param text Text.
     */
    parseRawTextElementContent(tagName, text) {
        const upperTagName = StringUtility.asciiUpperCase(tagName);
        if (upperTagName !== this.currentNode[PropertySymbol.tagName]) {
            return;
        }
        // Scripts are not allowed to be executed when they are parsed using innerHTML, outerHTML, replaceWith() etc.
        // However, they are allowed to be executed when document.write() is used.
        // See: https://developer.mozilla.org/en-US/docs/Web/API/HTMLScriptElement
        if (upperTagName === 'SCRIPT') {
            this.currentNode[PropertySymbol.evaluateScript] = this.evaluateScripts;
        }
        else if (upperTagName === 'LINK') {
            // An assumption that the same rule should be applied for the HTMLLinkElement is made here.
            this.currentNode[PropertySymbol.evaluateCSS] = this.evaluateScripts;
        }
        // Plain text elements such as <script> and <style> should only contain text.
        // Plain text elements should not decode entities. See #1564.
        this.currentNode[PropertySymbol.appendChild](this.rootDocument.createTextNode(text), true);
        const rawTextElement = this.currentNode;
        this.nodeStack.pop();
        this.tagNameStack.pop();
        this.currentNode = this.nodeStack[this.nodeStack.length - 1] || this.rootNode;
        this.readState = MarkupReadStateEnum.any;
        // Appends the raw text element to its parent.
        if (this.documentStructure) {
            const { documentElement, body } = this.documentStructure.nodes;
            // When parser mode is "htmlDocument", any element added directly to the document or document element should be added to the body.
            if (documentElement &&
                (this.currentNode === this.rootNode || this.currentNode === documentElement)) {
                body[PropertySymbol.appendChild](rawTextElement, true);
            }
            else {
                this.currentNode[PropertySymbol.appendChild](rawTextElement, true);
            }
        }
        else {
            this.currentNode[PropertySymbol.appendChild](rawTextElement, true);
        }
    }
    /**
     * Creates an element or returns a reference to it.
     *
     * @param tagName Tag name.
     */
    getStartTagElement(tagName) {
        const lowerTagName = StringUtility.asciiLowerCase(tagName);
        // NamespaceURI is inherited from the parent element.
        const namespaceURI = this.currentNode[PropertySymbol.namespaceURI];
        // NamespaceURI should be SVG when the tag name is "svg" (even in XML mode).
        if (lowerTagName === 'svg') {
            return this.rootDocument.createElementNS(NamespaceURI.svg, 'svg');
        }
        if (namespaceURI === NamespaceURI.svg) {
            return this.rootDocument.createElementNS(NamespaceURI.svg, SVGElementConfig[lowerTagName]?.localName || tagName);
        }
        // New element.
        switch (lowerTagName) {
            case 'html':
                if (!this.documentStructure) {
                    return null;
                }
                if (this.documentStructure.level < HTMLDocumentStructureLevelEnum.documentElement) {
                    this.documentStructure.level = HTMLDocumentStructureLevelEnum.documentElement;
                }
                return this.documentStructure.nodes.documentElement ?? null;
            case 'head':
                if (!this.documentStructure) {
                    return null;
                }
                if (this.documentStructure.level < HTMLDocumentStructureLevelEnum.head) {
                    this.documentStructure.level = HTMLDocumentStructureLevelEnum.head;
                }
                else if (this.documentStructure.level === HTMLDocumentStructureLevelEnum.head) {
                    this.documentStructure.level = HTMLDocumentStructureLevelEnum.additionalHeadWithoutBody;
                }
                return this.documentStructure.nodes.head ?? null;
            case 'body':
                if (!this.documentStructure) {
                    return null;
                }
                if (this.documentStructure.level < HTMLDocumentStructureLevelEnum.body) {
                    this.documentStructure.level = HTMLDocumentStructureLevelEnum.body;
                }
                return this.documentStructure.nodes.body ?? null;
            default:
                return this.rootDocument.createElementNS(NamespaceURI.html, lowerTagName);
        }
    }
    /**
     * Returns document type.
     *
     * @param value Value.
     * @returns Document type.
     */
    getDocumentType(value) {
        if (!value.toUpperCase().startsWith('DOCTYPE')) {
            return null;
        }
        const docTypeSplit = value.split(SPACE_REGEXP);
        if (docTypeSplit.length <= 1) {
            return null;
        }
        const docTypeString = docTypeSplit.slice(1).join(' ');
        const attributes = [];
        const attributeRegExp = new RegExp(DOCUMENT_TYPE_ATTRIBUTE_REGEXP, 'gm');
        const isPublic = docTypeString.toUpperCase().includes('PUBLIC');
        let attributeMatch;
        while ((attributeMatch = attributeRegExp.exec(docTypeString))) {
            attributes.push(attributeMatch[1]);
        }
        const publicId = isPublic ? attributes[0] || '' : '';
        const systemId = isPublic ? attributes[1] || '' : attributes[0] || '';
        return {
            name: docTypeSplit[1].toLowerCase(),
            publicId,
            systemId
        };
    }
}
//# sourceMappingURL=HTMLParser.js.map