myblog/node_modules/pug/test/output/classes-empty.js

function pug_attr(t, e, n, f) {
    return !1 !== e && null != e && (e || "class" !== t && "style" !== t) ? !0 === e ? " " + (f ? t : t + '="' + t + '"') : ("function" == typeof e.toJSON && (e = e.toJSON()), 
    "string" == typeof e || (e = JSON.stringify(e), n || -1 === e.indexOf('"')) ? (n && (e = pug_escape(e)), 
    " " + t + '="' + e + '"') : " " + t + "='" + e.replace(/'/g, "'") + "'") : "";
}

function pug_classes(s, r) {
    return Array.isArray(s) ? pug_classes_array(s, r) : s && "object" == typeof s ? pug_classes_object(s) : s || "";
}

function pug_classes_array(r, a) {
    for (var s, e = "", u = "", c = Array.isArray(a), g = 0; g < r.length; g++) (s = pug_classes(r[g])) && (c && a[g] && (s = pug_escape(s)), 
    e = e + u + s, u = " ");
    return e;
}

function pug_classes_object(r) {
    var a = "", n = "";
    for (var o in r) o && r[o] && pug_has_own_property.call(r, o) && (a = a + n + o, 
    n = " ");
    return a;
}

function pug_escape(e) {
    var a = "" + e, t = pug_match_html.exec(a);
    if (!t) return e;
    var r, c, n, s = "";
    for (r = t.index, c = 0; r < a.length; r++) {
        switch (a.charCodeAt(r)) {
          case 34:
            n = "&quot;";
            break;

          case 38:
            n = "&amp;";
            break;

          case 60:
            n = "&lt;";
            break;

          case 62:
            n = "&gt;";
            break;

          default:
            continue;
        }
        c !== r && (s += a.substring(c, r)), c = r + 1, s += n;
    }
    return c !== r ? s + a.substring(c, r) : s;
}

var pug_has_own_property = Object.prototype.hasOwnProperty;

var pug_match_html = /["&<>]/;

function template(locals) {
    var pug_html = "", pug_mixins = {}, pug_interp;
    pug_html = pug_html + "<a></a><a></a><a" + pug_attr("class", pug_classes([ undefined ], [ true ]), false, false) + "></a>";
    return pug_html;
}