public void unindent() {
        if (indentLevel > 0) {
            indentLevel--;
        }
    }

    /**
     * Sets the indentation string to use (e.g., "  ", "    ", "\t").
     */
    public void setIndentString(String indentString) {
        this.indentString = indentString != null ? indentString : Indentation.DEFAULT;
    }

    /**
     * Gets the current indentation prefix based on the current level.
     */