Re: [boost] [xpressive] Problem accessing repeating embedded pattern.

5 Jan 2006

      On Thursday 05 January 2006 01:15, Eric Niebler wrote:
...
Thanks for the code. I just tried it locally and it seems to work fine,
so the bug is already fixed. The output I get is:
namespace boost {
gruble "grot}
namespace boost {
gruble "grot
}
After CVS update I get same results :-)
...
(Looks like you'll need to be smart about not matching braces that are
in string literals.)
I use this for matching string literals:

    sregex escaped_quote = as_xpr( '\\' ) >> '"';
    sregex string_literal = as_xpr( '"' ) >> *( space |
                                                escaped_quote |
                                                -*_ ) >> '"';

seems to work, it will eat \" as part of string.  I guess it should only eat  
if there is an odd number of back-slashes prior to quote.

I tried:

    sregex escaped_quote = as_xpr( '\\' ) >> '"';
    sregex escaped_backslash = as_xpr( "\\\\" );
    sregex string_literal = as_xpr( '"' ) >> *( space |
                                                escaped_backslash |
                                                escaped_quote |
                                                -*_ ) >> '"';

But it did not work.  What are the percidence rules for the sub-elements in 
*( space |
   escaped_backslash |
   escaped_quote |
   -*_ ) 

?

Next  I try to combine that the literal string regexp  into grammar so I don't 
scan for braces within string literals.

Bjørn

Re: [boost] [xpressive] Problem accessing repeating embedded pattern.

Bjørn Roald