1
 #include <boost/spirit/include/qi.hpp>
 #include <string>
 #include <vector>
 #include <iterator>
 #include <algorithm>
 #include <iostream>
using namespace boost::spirit;
int main()
{
std::string s;
std::getline(std::cin, s);
auto specialtxt = *(qi::char_('-', '.', '_'));
auto txt = no_skip[*(qi::char_("a-zA-Z0-9_.\\:$\'-"))];
auto anytxt = *(qi::char_("a-zA-Z0-9_.\\:${}[]+/()-"));
qi::rule <std::string::iterator, void(),ascii::space_type> rule2 = txt     ('=') >> ('[') >> (']');
auto begin = s.begin();
auto end = s.end();
if (qi::phrase_parse(begin, end, rule2, ascii::space))
{
    std::cout << "MATCH" << std::endl;
}
else
{
    std::cout << "NO MATCH" << std::endl;
}

}

this code works fine in debug mode parser fails in release mode rule is to just parse text=[]; any thing else than this should fail it works fine in debug mode but not in release mode it shows result no match for any string.

if i enter string like 

abc=[];

this passes in debug as expected but fails in release

ganesh
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1 Answers1

2

You can't use auto with Spirit v2:

You have Undefined Behaviour

DEMO

I tried to make (more) sense of the rest of the code. There were various instances that would never work:

  1. txt('=') is an invalid Qi expression. I assumed you wanted txt >> ('=') instead

  2. qi::char_("a-zA-Z0-9_.\\:$\\-{}[]+/()") doesn't do what you think because $-{ is actually the character "range" \x24-\x7b... Escape the - (or put it at the very end/start of the set like in the other char_ call).

  3. qi::char_('-','.','_') can't work. Did you mean qi::char_("-._")?

  4. specialtxt and anytxt were unused...

  5. prefer const_iterator

  6. prefer namespace aliases above using namespace to prevent hard-to-detect errors

Live On Coliru

#include <boost/spirit/include/qi.hpp>
#include <iostream>

namespace qi = boost::spirit::qi;

int main() {
    std::string const s = "abc=[];";

    auto specialtxt = qi::copy(*(qi::char_("-._")));
    auto anytxt     = qi::copy(*(qi::char_("a-zA-Z0-9_.\\:$\\-{}[]+/()")));
    (void) specialtxt;
    (void) anytxt;

    auto txt        = qi::copy(qi::no_skip[*(qi::char_("a-zA-Z0-9_.\\:$\'-"))]);

    qi::rule<std::string::const_iterator, qi::space_type> rule2 = txt >> '=' >> '[' >> ']';

    auto begin = s.begin();
    auto end   = s.end();

    if (qi::phrase_parse(begin, end, rule2, qi::space)) {
        std::cout << "MATCH" << std::endl;
    } else {
        std::cout << "NO MATCH" << std::endl;
    }

    if (begin != end) {
        std::cout << "Trailing unparsed: '" << std::string(begin, end) << "'\n";
    }

}

Printing

MATCH
Trailing unparsed: ';'
sehe
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  • Added a fixed demo with (lots of) notes: recorded live session https://www.livecoding.tv/video/fixingreviewing-a-random-spirit-grammar/ – sehe Dec 15 '15 at 08:15
  • thanks man this is very useful in my application LHS value can be any thing like ab$c=[]; or xy.123z=[]; xy-3.0_z=[]; so it is kind of generic rule with it i can parse any kind of left side text – ganesh Dec 16 '15 at 12:13