mirror of
https://github.com/boostorg/spirit.git
synced 2026-01-19 04:42:11 +00:00
f44479bcd3
It is better to manage warnings on our side to know what warnings we need to fix or suppress, and the only thing that header does is disabling deprecation warnings on MSVC and ICC which we would prefer to not show to users.
101 lines
3.2 KiB
C++
101 lines
3.2 KiB
C++
/*=============================================================================
|
|
Copyright (c) 2002-2015 Joel de Guzman
|
|
|
|
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
|
=============================================================================*/
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// This sample demontrates a parser for a comma separated list of numbers.
|
|
//
|
|
// [ JDG May 10, 2002 ] spirit1
|
|
// [ JDG March 24, 2007 ] spirit2
|
|
// [ JDG May 12, 2015 ] spirit X3
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
#include <boost/spirit/home/x3.hpp>
|
|
|
|
#include <iostream>
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
namespace client
|
|
{
|
|
namespace x3 = boost::spirit::x3;
|
|
namespace ascii = boost::spirit::x3::ascii;
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
// Our number list compiler
|
|
///////////////////////////////////////////////////////////////////////////
|
|
template <typename Iterator>
|
|
bool parse_numbers(Iterator first, Iterator last, std::vector<double>& v)
|
|
{
|
|
using x3::double_;
|
|
using x3::phrase_parse;
|
|
using x3::_attr;
|
|
using ascii::space;
|
|
|
|
auto push_back = [&](auto& ctx){ v.push_back(_attr(ctx)); };
|
|
|
|
bool r = phrase_parse(first, last,
|
|
|
|
// Begin grammar
|
|
(
|
|
double_[push_back] >> *(',' >> double_[push_back])
|
|
)
|
|
,
|
|
// End grammar
|
|
|
|
space);
|
|
|
|
if (first != last) // fail if we did not get a full match
|
|
return false;
|
|
return r;
|
|
}
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////
|
|
// Main program
|
|
////////////////////////////////////////////////////////////////////////////
|
|
int
|
|
main()
|
|
{
|
|
std::cout << "/////////////////////////////////////////////////////////\n\n";
|
|
std::cout << "\t\tA comma separated list parser for Spirit...\n\n";
|
|
std::cout << "/////////////////////////////////////////////////////////\n\n";
|
|
|
|
std::cout << "Give me a comma separated list of numbers.\n";
|
|
std::cout << "The numbers will be inserted in a vector of numbers\n";
|
|
std::cout << "Type [q or Q] to quit\n\n";
|
|
|
|
std::string str;
|
|
while (getline(std::cin, str))
|
|
{
|
|
if (str.empty() || str[0] == 'q' || str[0] == 'Q')
|
|
break;
|
|
|
|
std::vector<double> v;
|
|
if (client::parse_numbers(str.begin(), str.end(), v))
|
|
{
|
|
std::cout << "-------------------------\n";
|
|
std::cout << "Parsing succeeded\n";
|
|
std::cout << str << " Parses OK: " << std::endl;
|
|
|
|
for (std::vector<double>::size_type i = 0; i < v.size(); ++i)
|
|
std::cout << i << ": " << v[i] << std::endl;
|
|
|
|
std::cout << "\n-------------------------\n";
|
|
}
|
|
else
|
|
{
|
|
std::cout << "-------------------------\n";
|
|
std::cout << "Parsing failed\n";
|
|
std::cout << "-------------------------\n";
|
|
}
|
|
}
|
|
|
|
std::cout << "Bye... :-) \n\n";
|
|
return 0;
|
|
}
|