func (e *helperMethodContent) WriteTo(w io.Writer) (int64, error) {
	var bf bytes.Buffer

	inner := e.src.inner
	if inner == nil {
		return 0, fmt.Errorf("inner is not specified [file: %s][line: %d]", e.ln.fileName(), e.ln.no)
	}

	// Write a define action.
	bf.WriteString(fmt.Sprintf(actionDefine, e.opts.DelimLeft, inner.path+doubleColon+e.name, e.opts.DelimRight))

	// Write the children's HTML.
	if i, err := e.writeChildren(&bf); err != nil {
		return i, err
	}

	// Write an end action.
	bf.WriteString(fmt.Sprintf(actionEnd, e.opts.DelimLeft, e.opts.DelimRight))

	// Write the buffer.
	i, err := w.Write(bf.Bytes())

	return int64(i), err
}
func (e *helperMethodContent) WriteTo(w io.Writer) (int64, error) {
	var bf bytes.Buffer

	inner := e.src.inner
	if inner == nil {
		return 0, fmt.Errorf("inner is not specified [file: %s][line: %d]", e.ln.fileName(), e.ln.no)
	}

	// Write a define action.
	bf.WriteString(fmt.Sprintf(actionDefine, e.opts.DelimLeft, inner.path+doubleColon+e.name, e.opts.DelimRight))

	// Write the children's HTML.
	if i, err := e.writeChildren(&bf); err != nil {
		return i, err
	}

	// Write an end action.
	bf.WriteString(fmt.Sprintf(actionEnd, e.opts.DelimLeft, e.opts.DelimRight))

	// Write the buffer.
	i, err := w.Write(bf.Bytes())

	return int64(i), err
}
// WriteTo writes data to w.