766cc4c9b7
The concept of ForwardIterator is flawed because it mixed 2 sets of concepts (value access and traversal) into 1 package. http://www.boost.org/doc/libs/1_65_1/libs/iterator/doc/new-iter-concepts.html It requires value_type (const)& as return type when dereference is applied, which is not mandatory in spirit parsing. A return type which is convertible to value_type is good enough. ReadableIteratorConcept and ForwardTraversalConcept should be what we need for the iterator check. For example, the iterator of the range returned by boost::adaptors::transform(std::string, func) is normally not a ForwardIterator. But it fulfills ReadableIteratorConcept and ForwardTraversalConcept and should be able to be parsed by spirit.
50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
/*=============================================================================
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Copyright (c) 2001-2017 Joel de Guzman
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Copyright (c) 2017 think-cell GmbH
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#include <boost/detail/lightweight_test.hpp>
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#include <boost/spirit/home/x3.hpp>
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#include <boost/range/adaptor/transformed.hpp>
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#include <iostream>
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#include <string>
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#include <functional>
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int main()
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{
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using boost::adaptors::transform;
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using boost::spirit::x3::raw;
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using boost::spirit::x3::eps;
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using boost::spirit::x3::eoi;
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using boost::spirit::x3::upper;
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using boost::spirit::x3::repeat;
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using boost::spirit::x3::parse;
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std::string input = "abcde";
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std::function<char(char)> func = [](char c) {
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return c < 'a' || 'z' < c ? c : static_cast<char>(c - 'a' + 'A');
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};
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auto const rng = transform(input, func);
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{
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std::string str;
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BOOST_TEST((parse(boost::begin(rng), boost::end(rng), +upper >> eoi, str)));
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BOOST_TEST(("ABCDE"==str));
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}
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{
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boost::iterator_range<decltype(boost::begin(rng))> str;
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BOOST_TEST((parse(boost::begin(rng), boost::end(rng), raw[+upper >> eoi], str)));
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BOOST_TEST((boost::equal(std::string("ABCDE"), str)));
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}
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{
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BOOST_TEST((parse(boost::begin(rng), boost::end(rng), (repeat(6)[upper] | repeat(5)[upper]) >> eoi)));
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}
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return boost::report_errors();
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}
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