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- /*=============================================================================
- Copyright (c) 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)
- =============================================================================*/
- #include <boost/detail/lightweight_test.hpp>
- #include <boost/spirit/home/x3.hpp>
- #include "test.hpp"
- namespace x3 = boost::spirit::x3;
- struct my_tag;
- struct my_rule_class
- {
- template <typename Iterator, typename Exception, typename Context>
- x3::error_handler_result
- on_error(Iterator&, Iterator const&, Exception const&, Context const& context)
- {
- x3::get<my_tag>(context)++;
- return x3::error_handler_result::fail;
- }
- template <typename Iterator, typename Attribute, typename Context>
- inline void
- on_success(Iterator const&, Iterator const&, Attribute&, Context const& context)
- {
- x3::get<my_tag>(context)++;
- }
- };
- int
- main()
- {
- using spirit_test::test_attr;
- using spirit_test::test;
- using boost::spirit::x3::rule;
- using boost::spirit::x3::int_;
- using boost::spirit::x3::with;
- { // injecting data into the context in the grammar
- int val = 0;
- auto r = rule<my_rule_class, char const*>() =
- '(' > int_ > ',' > int_ > ')'
- ;
- auto start =
- with<my_tag>(std::ref(val)) [ r ]
- ;
- BOOST_TEST(test("(123,456)", start));
- BOOST_TEST(!test("(abc,def)", start));
- BOOST_TEST(val == 2);
- }
- { // injecting non-const lvalue into the context
- int val = 0;
- auto const r = int_[([](auto& ctx){
- x3::get<my_tag>(ctx) += x3::_attr(ctx);
- })];
- BOOST_TEST(test("123,456", with<my_tag>(val)[r % ',']));
- BOOST_TEST(579 == val);
- }
- { // injecting rvalue into the context
- auto const r1 = int_[([](auto& ctx){
- x3::get<my_tag>(ctx) += x3::_attr(ctx);
- })];
- auto const r2 = rule<struct my_rvalue_rule_class, int>() =
- x3::lit('(') >> (r1 % ',') >> x3::lit(')')[([](auto& ctx){
- x3::_val(ctx) = x3::get<my_tag>(ctx);
- })];
- int attr = 0;
- BOOST_TEST(test_attr("(1,2,3)", with<my_tag>(100)[r2], attr));
- BOOST_TEST(106 == attr);
- }
- { // injecting const/non-const lvalue and rvalue into the context
- struct functor {
- int operator()(int& val) {
- return val * 10; // non-const ref returns 10 * injected val
- }
- int operator()(int const& val) {
- return val; // const ref returns injected val
- }
- };
- auto f = [](auto& ctx){
- x3::_val(ctx) = x3::_attr(ctx) + functor()(x3::get<my_tag>(ctx));
- };
- auto const r = rule<struct my_rule_class2, int>() = int_[f];
- int attr = 0;
- int const cval = 10;
- BOOST_TEST(test_attr("5", with<my_tag>(cval)[r], attr));
- BOOST_TEST(15 == attr); // x3::get returns const ref to cval
- attr = 0;
- int val = 10;
- BOOST_TEST(test_attr("5", with<my_tag>(val)[r], attr));
- BOOST_TEST(105 == attr); // x3::get returns ref to val
- attr = 0;
- BOOST_TEST(test_attr("5", with<my_tag>(10)[r], attr));
- // x3::get returns ref to member variable of with_directive
- BOOST_TEST(105 == attr);
- }
- return boost::report_errors();
- }
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