Boost C++ Libraries

program
    =
    *(  macro
    |   preprocessor
    |   comment
    |   keyword
    |   identifier
    |   special
    |   string_
    |   char_
    |   number
    |   space_p
    |   anychar_p
    )
    ;

macro
    =   *space_p >> self.macro
    ;

preprocessor
    =   *space_p >> '#' >> ((alpha_p | '_') >> *(alnum_p | '_'))
    ;

comment
    =   +(*space_p >> (comment_p("//") | comment_p("/*", "*/")))
    ;

keyword
    =   *space_p >> keyword_ >> (eps_p - (alnum_p | '_'))
    ;   // make sure we recognize whole words only

keyword_
    =   "and_eq", "and", "asm", "auto", "bitand", "bitor",
        "bool", "break", "case", "catch", "char", "class",
        "compl", "const_cast", "const", "continue", "default",
        "delete", "do", "double", "dynamic_cast",  "else",
        "enum", "explicit", "export", "extern", "false",
        "float", "for", "friend", "goto", "if", "inline",
        "int", "long", "mutable", "namespace", "new", "not_eq",
        "not", "operator", "or_eq", "or", "private",
        "protected", "public", "register", "reinterpret_cast",
        "return", "short", "signed", "sizeof", "static",
        "static_cast", "struct", "switch", "template", "this",
        "throw", "true", "try", "typedef", "typeid",
        "typename", "union", "unsigned", "using", "virtual",
        "void", "volatile", "wchar_t", "while", "xor_eq", "xor"
    ;

special
    =   *space_p >> +chset_p("~!%^&*()+={[}]:;,<.>?/|\\-")
    ;

string_
    =   *space_p >> !as_lower_d['l'] >> confix_p('"', *c_escape_ch_p, '"')
    ;

char_
    =   *space_p >> !as_lower_d['l'] >> confix_p('\'', *c_escape_ch_p, '\'')
    ;

number
    =   *space_p >>
        (   as_lower_d["0x"] >> hex_p
        |   '0' >> oct_p
        |   real_p
        )
        >>  *as_lower_d[chset_p("ldfu")]
    ;

identifier
    =   *space_p >> ((alpha_p | '_') >> *(alnum_p | '_'))
    ;