boost/libs/spirit/test/x3/alternative.cpp

/*=============================================================================
    Copyright (c) 2001-2013 Joel de Guzman
    Copyright (c) 2001-2011 Hartmut Kaiser

    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/mpl/print.hpp>
#include <boost/spirit/home/x3.hpp>
#include <boost/fusion/include/adapt_struct.hpp>
#include <boost/variant.hpp>
//~ #include <boost/assert.hpp>
#include <boost/fusion/include/vector.hpp>
#include <boost/fusion/include/at.hpp>

#include <string>
#include <iostream>
#include <vector>
#include "test.hpp"

//~ struct test_action
//~ {
    //~ test_action(char last)
      //~ : last_(last) {}

    //~ void operator()(std::vector<char> const& v
      //~ , boost::spirit::x3::unused_type
      //~ , boost::spirit::x3::unused_type) const
    //~ {
        //~ BOOST_TEST(v.size() == 4 &&
            //~ v[0] == 'a' && v[1] == 'b' && v[2] == '1' && v[3] == last_);
    //~ }

    //~ char last_;
//~ };

//~ struct test_action_2
//~ {
    //~ typedef std::vector<boost::optional<char> > result_type;

    //~ void operator()(result_type const& v
      //~ , boost::spirit::x3::unused_type
      //~ , boost::spirit::x3::unused_type) const
    //~ {
        //~ BOOST_TEST(v.size() == 5 &&
            //~ !v[0] && v[1] == 'a' && v[2] == 'b' && v[3] == '1' && v[4] == '2');
    //~ }
//~ };

struct di_ignore
{
    std::string text;
};

struct di_include
{
    std::string FileName;
};

BOOST_FUSION_ADAPT_STRUCT(
    di_ignore,
    (std::string, text)
)

BOOST_FUSION_ADAPT_STRUCT(
    di_include,
    (std::string, FileName)
)

struct undefined {};

int
main()
{
    using spirit_test::test;
    using spirit_test::test_attr;

    using boost::spirit::x3::attr;
    using boost::spirit::x3::char_;
    using boost::spirit::x3::int_;
    using boost::spirit::x3::lit;
    using boost::spirit::x3::unused_type;
    using boost::spirit::x3::unused;
    using boost::spirit::x3::omit;


    {
        BOOST_TEST((test("a", char_ | char_)));
        BOOST_TEST((test("x", lit('x') | lit('i'))));
        BOOST_TEST((test("i", lit('x') | lit('i'))));
        BOOST_TEST((!test("z", lit('x') | lit('o'))));
        BOOST_TEST((test("rock", lit("rock") | lit("roll"))));
        BOOST_TEST((test("roll", lit("rock") | lit("roll"))));
        BOOST_TEST((test("rock", lit("rock") | int_)));
        BOOST_TEST((test("12345", lit("rock") | int_)));
    }

    {
        typedef boost::variant<undefined, int, char> attr_type;
        attr_type v;

        BOOST_TEST((test_attr("12345", int_ | char_, v)));
        BOOST_TEST(boost::get<int>(v) == 12345);

        BOOST_TEST((test_attr("12345", lit("rock") | int_ | char_, v)));
        BOOST_TEST(boost::get<int>(v) == 12345);

        v = attr_type();
        BOOST_TEST((test_attr("rock", lit("rock") | int_ | char_, v)));
        BOOST_TEST(v.which() == 0);

        BOOST_TEST((test_attr("x", lit("rock") | int_ | char_, v)));
        BOOST_TEST(boost::get<char>(v) == 'x');
    }

    {   // Make sure that we are using the actual supplied attribute types
        // from the variant and not the expected type.
         boost::variant<int, std::string> v;
         BOOST_TEST((test_attr("12345", int_ | +char_, v)));
         BOOST_TEST(boost::get<int>(v) == 12345);

         BOOST_TEST((test_attr("abc", int_ | +char_, v)));
         BOOST_TEST(boost::get<std::string>(v) == "abc");

         BOOST_TEST((test_attr("12345", +char_ | int_, v)));
         BOOST_TEST(boost::get<std::string>(v) == "12345");
    }

    //~ {   // test action

        //~ namespace phx = boost::phoenix;
        //~ boost::optional<boost::variant<int, char> > v;

        //~ BOOST_TEST((test("12345", (lit("rock") | int_ | char_)[phx::ref(v) = _1])));
        //~ BOOST_TEST(boost::get<int>(boost::get(v)) == 12345);
        //~ BOOST_TEST((test("rock", (lit("rock") | int_ | char_)[phx::ref(v) = _1])));
        //~ BOOST_TEST(!v);
    //~ }

    {
        unused_type x;
        BOOST_TEST((test_attr("rock", lit("rock") | lit('x'), x)));
    }

    {
        // test if alternatives with all components having unused
        // attributes have an unused attribute

        using boost::fusion::vector;
        using boost::fusion::at_c;

        vector<char, char> v;
        BOOST_TEST((test_attr("abc",
            char_ >> (omit[char_] | omit[char_]) >> char_, v)));
        BOOST_TEST((at_c<0>(v) == 'a'));
        BOOST_TEST((at_c<1>(v) == 'c'));
    }

    {
        // Test that we can still pass a "compatible" attribute to
        // an alternate even if its "expected" attribute is unused type.

        std::string s;
        BOOST_TEST((test_attr("...", *(char_('.') | char_(',')), s)));
        BOOST_TEST(s == "...");
    }

    // $$$ Not yet implemented
    //~ {   // make sure collapsing eps works as expected
        //~ // (compile check only)

        //~ using boost::spirit::x3::rule;
        //~ using boost::spirit::x3::eps;

        //~ rule<class r1, wchar_t> r1;
        //~ rule<class r2, wchar_t> r2;
        //~ rule<class r3, wchar_t> r3;

        //~ r3  = ((eps >> r1))[_val += _1];
        //~ r3  = ((r1 ) | r2)[_val += _1];

        //~ r3 = ((eps >> r1) | r2);
    //~ }

    //~ // make sure the attribute of an alternative gets properly collapsed
    //~ {
        //~ using boost::spirit::x3::lexeme;
        //~ using boost::spirit::x3::ascii::alnum;
        //~ using boost::spirit::x3::ascii::alpha;
        //~ using boost::spirit::x3::ascii::digit;
        //~ using boost::spirit::x3::ascii::string;
        //~ namespace phx = boost::phoenix;


        //~ BOOST_TEST( (test("ab1_", (*(alnum | char_('_')))[test_action('_')])) );
        //~ BOOST_TEST( (test("ab12", (*(alpha | digit))[test_action('2')])) );

        //~ BOOST_TEST( (test("abcab12", (*("abc" | alnum))[test_action_2()])) );

        //~ std::vector<boost::optional<char> > v;
        //~ BOOST_TEST( (test("x,y,z", (*(',' | char_))[phx::ref(v) = _1])) );
        //~ BOOST_ASSERT(v[0] == 'x');
        //~ BOOST_ASSERT(!v[1]);
        //~ BOOST_ASSERT(v[2] == 'y');
        //~ BOOST_ASSERT(!v[3]);
        //~ BOOST_ASSERT(v[4] == 'z');
    //~ }

    {
        std::string s;
        using boost::spirit::x3::eps;

        // test having a variant<container, ...>
        BOOST_TEST( (test_attr("a,b", (char_ % ',') | eps, s )) );
        BOOST_TEST(s == "ab");
    }

    {
        using boost::spirit::x3::eps;

        // testing a sequence taking a container as attribute
        std::string s;
        BOOST_TEST( (test_attr("abc,a,b,c",
            char_ >> char_ >> (char_ % ','), s )) );
        BOOST_TEST(s == "abcabc");

        // test having an optional<container> inside a sequence
        s.erase();
        BOOST_TEST( (test_attr("ab",
            char_ >> char_ >> -(char_ % ','), s )) );
        BOOST_TEST(s == "ab");

        // test having a variant<container, ...> inside a sequence
        s.erase();
        BOOST_TEST( (test_attr("ab",
            char_ >> char_ >> ((char_ % ',') | eps), s )) );
        BOOST_TEST(s == "ab");
        s.erase();
        BOOST_TEST( (test_attr("abc",
            char_ >> char_ >> ((char_ % ',') | eps), s )) );
        BOOST_TEST(s == "abc");
    }

    //~ {
        //~ using boost::spirit::x3::int_;

        //~ int i = 0;
        //~ BOOST_TEST( (test_attr("10", int_(5) | int_(10), i)) );
        //~ BOOST_TEST(i == 10);
    //~ }

    // $$$ No longer relevant? $$$
    {
        //compile test only (bug_march_10_2011_8_35_am)
        typedef boost::variant<double, std::string> value_type;

        using boost::spirit::x3::rule;
        using boost::spirit::x3::eps;

        rule<class r1, value_type> r1;
        auto r1_ = r1 = r1 | eps; // left recursive!

        unused = r1_; // silence unused local warning
    }

    {
        using boost::spirit::x3::rule;
        typedef boost::variant<di_ignore, di_include> d_line;

        rule<class ignore, di_ignore> ignore;
        rule<class include, di_include> include;
        rule<class line, d_line> line;

        auto start =
            line = include | ignore;

        unused = start; // silence unused local warning
    }

    // single-element fusion vector tests
    {
        boost::fusion::vector<boost::variant<int, std::string>> fv;
        BOOST_TEST((test_attr("12345", int_ | +char_, fv)));
        BOOST_TEST(boost::get<int>(boost::fusion::at_c<0>(fv)) == 12345);

        boost::fusion::vector<boost::variant<int, std::string>> fvi;
        BOOST_TEST((test_attr("12345", int_ | int_, fvi)));
        BOOST_TEST(boost::get<int>(boost::fusion::at_c<0>(fvi)) == 12345);
    }

    // alternative over single element sequences as part of another sequence
    {
	auto  key1 = lit("long") >> attr(long());
	auto  key2 = lit("char") >> attr(char());
	auto  keys = key1 | key2;
	auto pair = keys >> lit("=") >> +char_;

	boost::fusion::deque<boost::variant<long, char>, std::string> attr_;

	BOOST_TEST(test_attr("long=ABC", pair, attr_));
	BOOST_TEST(boost::get<long>(&boost::fusion::front(attr_)) != nullptr);
	BOOST_TEST(boost::get<char>(&boost::fusion::front(attr_)) == nullptr);
    }

    return boost::report_errors();
}