Re: IPv6 mapped phrase not parsing MSVC2015

Duh!

On Mon, Dec 25, 2017 at 3:11 PM, Michael Powell <[email protected]> wrote:
> Hello,
>
> Merry Christmas!
>
> The same phrases/grammar is working on GCC but does not appear to work
> across platforms on Microsoft Visual C++ 2015.
>
> https://wandbox.org/permlink/LDudwkvVa0M7J6z0

Helps when I actually include the grammar in question among the
candidate parsers:

void VerifyMappedAddress(const std::string& addr, bool expected_match
    , const std::function<void(const std::string&, const
Ast::IPv4MappedAddress)>& verify) {
    typedef std::string::const_iterator It;
    MappedAddrParser0<It> g0; MappedAddrParser1<It> g1;
    MappedAddrParser2<It> g2; MappedAddrParser3<It> g3;
    //                        ^^^^^^^^^^^^^^^^^^^^^^^^^
    Ast::IPv4MappedAddress y;
    INFO("Verifying address >>> " + addr + " <<<");
    // And with some variadic help, gets the job done.
    auto const actual_match = TryVerifyGrammars<It, Ast::IPv4MappedAddress
        , decltype(g0), decltype(g1), decltype(g2), decltype(g3)>(
            addr.begin(), addr.end(), y, expected_match, g0, g1, g2, g3);
    if (actual_match == expected_match) {
        verify(addr, y);
    }
    else {
        FAIL("Failed to identify the expected match");
    }
}


> The first couple of IPv4 mapped phrase grammars work, no problem. But
> when I jump into the third, all of a sudden there is a problem. I've
> tried different iterations how to compose the grammar, all are
> rejecting the test case:
>
> // Micro-grammar representing the phrase: / [*1(h16 ":") h16] "::"
> 3(h16 ":") ls32
> _ipv6_addr_base = lexeme[
>     _h16_col >> _h16 >> _col_x2 >> _h16_col >> _h16_col >> _h16
>         | /* */ _h16 >> _col_x2 >> _h16_col >> _h16_col >> _h16
>         | /*         */ _col_x2 >> _h16_col >> _h16_col >> _h16
> ];
>
> // or...
> _ipv6_addr_base = lexeme[
>     -(_h16_col >> _h16
>         | /*   */ _h16
>         ) >> _col_x2 >> _h16_col >> _h16_col >> _h16
> ];
>
> // or...
> _ipv6_addr_base = lexeme[(
>     _h16_col >> _h16 >> _col_x2
>     | _h16 >> /*     */ _col_x2
>     | /*             */ _col_x2
>     ) >> _h16_col >> _h16_col >> _h16
> ];
>
> // The bit with the ':' delimiter is the odd exception to including
> Colon in the address.
> _start = _ipv6_addr_base >> col_ >> _ls32 >> eoi;
>
> // The test case: "::c60:b132:f8e2:120.48.69.95"
>
> The same grammar/test case in GCC appears to pass without difficulties.
>
> Running with Boost version: '106501'
> Parsing '::1234:3456:5678:0.12.234.50' -> ::1234:3456:5678:0.12.234.50 (PASS)
>
> Phrase elements are composed in the same way across platforms using
> Integer parsers, etc.
>
> What is the cross platform issue with Boost.Spirit, then? Open to suggestions...
>
> Cheers,
>
> Michael Powell

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