From: Joel de Guzman (djowel_at_[hidden])
Date: 2003-08-28 20:03:31
Chris,
Spirit has its own mailing list:
Spirit-general_at_[hidden]
https://lists.sourceforge.net/lists/listinfo/spirit-general
Please post further questions there. Thanks.
--
Joel de Guzman
http://www.boost-consulting.com
http://spirit.sf.net
Chris Cooney <ccooney_at_[hidden]> wrote:
> Hello,
>
> I've been fiddling around with boost::spirit in an
> attempt to write a small and esoteric scripting language.
>
> Here's some code snipits of what I'm trying to do.
> example script (a one liner in this case):
>
> DO_SOMETHING(param1,param2)
>
>
> the grammer:
>
> struct my_grammer : public grammar<my_grammer>
> {
> my_grammer(vector<string>& v_): v(v_) {}
>
> template <typename ScannerT>
> struct definition
> {
> definition(wb_grammer const& self)
> {
> //char token defs
> COMMA = ch_p(',');
> LPAREN = ch_p('(');
> RPAREN = ch_p(')');
> USCORE = ch_p('_');
>
> param_alnum = lexeme_d[alpha_p >> *(alnum_p)];
>
> do_something = str_p("DO_SOMETHING") >> LPAREN >>
> /*param1*/param_alnum[append(self.v)] >> !COMMA >>
> /*param2*/param_alnum[append(self.v)] >> RPAREN;
>
> do_something_else = str_p("DO_SOMETHING_ELSE") >> LPAREN >>
> /*param1*/param_mode[append(self.v)] >> !COMMA >>
> /*param2*/param_type[append(self.v)] >> RPAREN;
>
> functions = do_something | do_something_else;
> }
>
> rule<ScannerT>
> COMMA,LPAREN,RPAREN,USCORE,param_alnum,do_something,do_something_else,functi
> ons;
>
> rule<ScannerT> const&
> start() const { return functions; }
> };
>
> vector<string>& v;
> };
>
>
> int main()
> {
> vector<string> v;
> my_grammer script_grammer(v);
> string str;
>
> while (getline(cin, str))
> {
> parse_info<> info = parse(str.c_str(), script_grammer, space_p);
>
> if (info.full)
> {
> //determine which rule (script function) was called
> //and do something with the parameters stored in the vector
> }
> else
> {
> //error out.
> }
> }
> }
>
>
> problem:
>
> My problem is how to determine which rule was the one
> that resulted in a successful parsing of the
> line ("DO_SOMETHING(param1,param2)");
>
> NOTE: I'm unfortunately stuck with the MSVC 7.0 compiler so
> I can't use the Tree functionalities of spirit because of their
> implementations use of partial template specialization.
>
> any ideas?
>
> Thank you very much,
>
> Chris.
>
>
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