Re: [Boost-users] [xpressive] assert while matching file contents.

Subject: Re: [Boost-users] [xpressive] assert while matching file contents.
From: Raindog (raindog_at_[hidden])
Date: 2008-09-24 00:38:16

Raindog wrote:
> Hello,
>
> I have the following regex:
>
>    sregex sig_re = "@rem {" >>(sig_= -*_)>> "}, " >> (vbp_= -*_) >> _ln;
>
> which I am trying to use to match the last line of the following string.
> The string is read in from a file.
>
>    xcopy "foo" "foo3.bat" /Y
>    xcopy "foo" "foo3.bat" /Y
>    xcopy "foo" "foo3.bat" /Y
>    xcopy "foo" "foo3.bat" /Y
>    @rem c:\foo\somefile.txt files: 4
>    @rem {0xffffffff, SOMETYPEDEF, ""}, //c:\foo\somefile.txt
>
> When I call:
>
>    sregex_iterator cur(file_contents.begin(), file_contents.end(), 
> sig_re);
>
> however, I get an assertion:
>
>    Assertion failed: !s0.matched, file
> c:\code\boost-trunk\boost\xpressive\detail\core\matcher\end_matcher.hpp,
> line 37
>
> Originally I had wanted to match the varying parts of the above file but
> I kept getting the above assertion, so I decided to take the easy way
> and just match the last line of the file, but still got the assertion.
> My original regex was this:
>
>    mark_tag file_(0), vbp_(1), sig_(2);
>    sregex files_re = "xcopy" >> *_ >> "/Y" >> _n;
>    sregex vbp_re = "@rem " >> -*_ >> " files: " >> repeat<1, 4>(_d) >> 
> _ln;
>    sregex sig_re = "@rem {" >> -*_>> "}, " >> -*_ >> _ln;
>    sregex file_re =
>        (file_=(files_re)) >>
>        (vbp_=(vbp_re)) >>
>        (sig_=(sig_re));
>
>
> But that failed. Which leads me to my second question, with the above
> file, I would like an xpressive regex that will match the 3 portions of
> the file so that I have:
>
> a. An array of sub_match containing the following 4 strings
>    xcopy "foo" "foo3.bat" /Y
>    xcopy "foo" "foo3.bat" /Y
>    xcopy "foo" "foo3.bat" /Y
>    xcopy "foo" "foo3.bat" /Y
>
> b. A sub_match with the following string:

So I did a bit more digging and the following gives me everything I want 
except for the capture group where I capture the list of 4 xcopy lines.

    sregex files_re = "xcopy" >> -*_ >> "/Y" >> _n;
    sregex vbp_re = "@rem " >> -*_ >> " files: " >> repeat<1, 4>(_d) >> _ln;
    sregex sig_re = "@rem {" >> -*_>> "}, " >> -*_ >> _ln;
    sregex file_re =
        *files_re >>
        (vbp_=vbp_re) >>
        (sig_=sig_re);

Which lets me complete my immediate task but still leaves me curious 
about how I would go about capturing the 4 xcopy lines.

Thanks,
Josh