Method parse

www/js/_hyperscript.js:5540–5546

(parser)

      this.args = { value: rhs };
    }
    static parse(parser) {
      var op = parser.matchAnyToken("first", "last", "random");
      if (!op) return;
      parser.matchAnyToken("in", "from", "of");
      var rhs = parser.requireElement("unaryExpression");
      return new _PositionalExpression(rhs, op.value);
    }
    resolve(context, { value: rhsVal }) {
      if (rhsVal && !Array.isArray(rhsVal)) {
        if (rhsVal.children) {