def escape(string):
    """
    Replace special characters with their equivalent LaTeX macros.

    Args:
        string (str): The string to process.

    Returns:
        str: The string with special characters replaced with macros.
    """
    replacements = {'&': '\\&', '%': '\\%', '$': '\\$', '#': '\\#', '_':
        '\\_', '{': '\\{', '}': '\\}', '~': '\\textasciitilde{}', '^':
        '\\^{}', '\\': '\\textbackslash{}', '\n': '\\newline%\n', '-':
        '{-}', '\xa0': '~', '[': '{[}', ']': '{]}'}
    escaped = ''
    for char in string:
        escaped += replacements.get(char, char)
    return escaped
