source: downloads/boost_1_34_1/libs/spirit/test/while_tests.cpp @ 33

/*=============================================================================
    Phoenix V1.0
    Copyright (c) 2002-2003 Martin Wille

    Use, modification and distribution is subject to 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)
==============================================================================*/
// vi:ts=4:sw=4:et
// Tests for boost::spirit::while_p
// [28-Dec-2002]
////////////////////////////////////////////////////////////////////////////////
#define qDebug 0
#include <iostream>
#include <cstring>
#if qDebug
#define BOOST_SPIRIT_DEBUG
#endif

#include "impl/string_length.hpp"
#include <boost/spirit/core.hpp>
#include <boost/spirit/actor/assign_actor.hpp>
#include <boost/spirit/dynamic/while.hpp>
#include <boost/ref.hpp>

namespace local
{
    template <typename T>
    struct var_wrapper
        : public ::boost::reference_wrapper<T>
    {
        typedef boost::reference_wrapper<T> parent;

        explicit inline var_wrapper(T& t) : parent(t) {}

        inline T& operator()() const { return parent::get(); }
    };

    template <typename T>
    inline var_wrapper<T>
    var(T& t)
    {
        return var_wrapper<T>(t);
    }
}

namespace
{
    template <typename T>
    class add_actor
    {
    public:
        explicit add_actor(T &ref_) : ref(ref_) {}

        template <typename T2>
        void operator()(T2 const &val) const
        { ref += val; }

    private:
        T& ref;
    };

    template <typename T>
    inline add_actor<T> const
    add(T& ref)
    {
        return add_actor<T>(ref);
    }
}

typedef boost::spirit::rule<> rule_t;

unsigned int test_count = 0;
unsigned int error_count = 0;
unsigned int iterations_performed;

unsigned int number_result;
static const unsigned int kError = 999;
static const bool good = true;
static const bool bad = false;

rule_t while_rule;
rule_t do_while_rule;

void
test_while(
    char const *s,
    unsigned int wanted,
    rule_t const &r,
    unsigned int iterations_wanted)
{
    using namespace std;
    
    ++test_count;

    number_result = 0;
    iterations_performed = 0;

    boost::spirit::parse_info<> m = boost::spirit::parse(s, s+ test_impl::string_length(s), r);

    bool result = wanted == kError?(m.full?bad:good): (number_result==wanted);

    result &= iterations_performed == iterations_wanted;

    if (m.full && (m.length != test_impl::string_length(s)))
        result = bad;

    if (result==good)
        cout << "PASSED";
    else
    {
        ++error_count;
        cout << "FAILED";
    }

    cout << ": \"" << s << "\" ==> ";
    if (!m.full)
        cout << "<error>";
    else
        cout << number_result;
    cout << "     " << iterations_performed << " of "
         << iterations_wanted << " iterations\n";
}

template<typename T>
struct inc_actor
{
    explicit inc_actor(T &t) : var(t) {}
    template<typename IteratorT>
    void operator()(IteratorT const &, IteratorT const &) const
    {
        ++var;
    }
    template<typename U>
    void operator()(U) const
    {
        ++var;
    }
    T &var;
};

template<typename T>
inc_actor<T>
inc(T &t)
{
    return inc_actor<T>(t);
}

int
main()
{
    using namespace std;
    using ::boost::spirit::uint_p;
    using ::boost::spirit::while_p;
    using ::boost::spirit::do_p;
    using ::boost::spirit::assign_a;

#if qDebug
    BOOST_SPIRIT_DEBUG_RULE(while_rule);
    BOOST_SPIRIT_DEBUG_RULE(do_while_rule);
#endif

    while_rule
        =   uint_p[assign_a(number_result)]
        >>  while_p('+')
            [
                uint_p[add(number_result)][inc(iterations_performed)]
            ];

    do_while_rule
        =   do_p
            [
                uint_p[add(number_result)][inc(iterations_performed)]
            ].while_p('+');

    cout << "/////////////////////////////////////////////////////////\n";
    cout << "\n";
    cout << "          while_p test\n";
    cout << "\n";
    cout << "/////////////////////////////////////////////////////////\n";
    cout << "\n";

    cout << "while_p()[]\n";
    test_while("",       kError, while_rule, 0);
    test_while("1",           1, while_rule, 0);
    test_while("1+1",         2, while_rule, 1);
    test_while("1+1+12",     14, while_rule, 2);
    test_while("1+1+x",  kError, while_rule, 1);

    cout << "do_p[].while_p()\n";
    test_while("",       kError, do_while_rule, 0);
    test_while("1",           1, do_while_rule, 1);
    test_while("1+1",         2, do_while_rule, 2);
    test_while("1+1+12",     14, do_while_rule, 3);
    test_while("1+1+x",  kError, do_while_rule, 2);

    std::cout << "\n    ";
    if (error_count==0)
        cout << "All " << test_count << " while_p-tests passed.\n"
             << "Test concluded successfully\n";
    else
        cout << error_count << " of " << test_count << " while_p-tests failed\n"
             << "Test failed\n";

    return error_count!=0;
}