tag-soup/serializeMarkup.js

The fastest pure JS SAX/DOM XML/HTML parser.

import { CDATASection, Comment, Document, DocumentFragment, DocumentType, Element, ProcessingInstruction, Text, } from 'flyweight-dom';
/**
 * Serializes DOM node as HTML/XML string.
 *
 * @param node DOM node to serialize.
 * @param options Serialization options.
 */
export function serializeMarkup(node, options) {
    const { toHashCode, voidTags, areSelfClosingTagsSupported, encodeText = identity } = options;
    if (node instanceof Element) {
        let output = '<' + node.tagName;
        for (const name in node.attributes) {
            output += ' ' + name + '="' + encodeText(node.attributes[name]) + '"';
        }
        if (node.firstChild !== null) {
            output += '>';
            for (let child = node.firstChild; child !== null; child = child.nextSibling) {
                output += serializeMarkup(child, options);
            }
            output += '</' + node.tagName + '>';
        }
        else if (voidTags !== undefined && voidTags.has(toHashCode(node.tagName))) {
            output += '>';
        }
        else if (areSelfClosingTagsSupported) {
            output += '/>';
        }
        else {
            output += '></' + node.tagName + '>';
        }
        return output;
    }
    if (node instanceof CDATASection) {
        return '<![CDATA[' + node.data + ']]>';
    }
    if (node instanceof Document || node instanceof DocumentFragment) {
        let output = '';
        for (let child = node.firstChild; child !== null; child = child.nextSibling) {
            output += serializeMarkup(child, options);
        }
        return output;
    }
    if (node instanceof Comment) {
        return '<!--' + node.data + '-->';
    }
    if (node instanceof DocumentType) {
        return '<!DOCTYPE ' + node.name + '>';
    }
    if (node instanceof ProcessingInstruction) {
        return '<?' + node.target + ' ' + node.data + '?>';
    }
    if (node instanceof Text) {
        return encodeText(node.data);
    }
    return '';
}
function identity(value) {
    return value;
}