Re: [GD-General] Text file parsing

[Ivan-Assen I. <as...@ha...>]

Text file parsingBy the way, if you are feeling TRULY adventurous, 
you might try Spirit (http://spirit.sourceforge.net).

It's a framework? library? metalibrary? for creating
parsers by describing the grammer directly within C++
code via a mindboggling amount of template trickery.

here's their "hello world" example - a parser which
takes a comma-separated list of floats and stuffs them
into a std::vector:

    bool
    parse_numbers(char const* str, vector<double>& v)
    {
        return parse(str,

            //  Begin grammar
            (
                real_p[append(v)] >> *(',' >> real_p[append(v)])
            )
            ,
            //  End grammar

            space_p).full;
    }

Translation: >> means "followed by", and is just whitespace in BNF;
the Kleene star *, means what it usually means, but by obvious
reasons has to be put IN FRONT of the subexpression.