Function markup

docs/app/js/sanddance-app.js:124000–124030

()

const innerText = (val)=>(val + "").replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
const attrText = (val)=>innerText(val).replace(/"/g, "&quot;").replace(/\t/g, "&#x9;").replace(/\n/g, "&#xA;").replace(/\r/g, "&#xD;");
function markup() {
    let buf = "", outer = "", inner = "";
    const stack = [], clear = ()=>outer = inner = "", push = (tag)=>{
        if (outer) {
            buf += `${outer}>${inner}`;
            clear();
        }
        stack.push(tag);
    }, attr3 = (name, value8)=>{
        if (value8 != null) outer += ` ${name}="${attrText(value8)}"`;
        return m;
    }, m = {
        open (tag, ...attrs) {
            push(tag);
            outer = "<" + tag;
            for (const set of attrs)for(const key in set)attr3(key, set[key]);
            return m;
        },
        close () {
            const tag = stack.pop();
            if (outer) buf += outer + (inner ? `>${inner}</${tag}>` : "/>");
            else buf += `</${tag}>`;
            clear();
            return m;
        },
        attr: attr3,
        text: (t)=>(inner += innerText(t), m),
        toString: ()=>buf
    };
    return m;
}
const serializeXML = (node)=>_serialize(markup(), node) + "";
function _serialize(m, node) {
    m.open(node.tagName);