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// Copyright Vladimir Prus 2002-2004.
// 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 <cassert>
#include <string>
#include <fstream>
#include <sstream>
#include <iostream>
#include <boost/progress.hpp>
#include <boost/bind.hpp>
#include <boost/ref.hpp>
#include <boost/program_options/detail/convert.hpp>
#include <boost/program_options/detail/utf8_codecvt_facet.hpp>
#include "minitest.hpp"
using namespace std;
string file_content(const string& filename)
{
ifstream ifs(filename.c_str());
assert(ifs);
stringstream ss;
ss << ifs.rdbuf();
return ss.str();
}
// A version of from_8_bit which does not use functional object, for
// performance comparison.
std::wstring from_8_bit_2(const std::string& s,
const codecvt<wchar_t, char, mbstate_t>& cvt)
{
std::wstring result;
std::mbstate_t state = {0};
const char* from = s.data();
const char* from_end = s.data() + s.size();
// The interace of cvt is not really iterator-like, and it's
// not possible the tell the required output size without the conversion.
// All we can is convert data by pieces.
while(from != from_end) {
// std::basic_string does not provide non-const pointers to the data,
// so converting directly into string is not possible.
wchar_t buffer[32];
wchar_t* to_next = buffer;
// Try to convert remaining input.
std::codecvt_base::result r =
cvt.in(state, from, from_end, from, buffer, buffer + 32, to_next);
if (r == std::codecvt_base::error)
throw logic_error("character conversion failed");
// 'partial' is not an error, it just means not all source characters
// we converted. However, we need to check that at least one new target
// character was produced. If not, it means the source data is
// incomplete, and since we don't have extra data to add to source, it's
// error.
if (to_next == buffer)
throw logic_error("character conversion failed");
// Add converted characters
result.append(buffer, to_next);
}
return result;
}
void test_convert(const std::string& input,
const std::string& expected_output)
{
boost::program_options::detail::utf8_codecvt_facet facet;
std::wstring output;
{
boost::progress_timer t;
for (int i = 0; i < 10000; ++i)
output = boost::from_8_bit(
input,
facet);
}
{
boost::progress_timer t;
for (int i = 0; i < 10000; ++i)
output = from_8_bit_2(
input,
facet);
}
BOOST_CHECK(output.size()*2 == expected_output.size());
for(unsigned i = 0; i < output.size(); ++i) {
{
unsigned low = output[i];
low &= 0xFF;
unsigned low2 = expected_output[2*i];
low2 &= 0xFF;
BOOST_CHECK(low == low2);
}
{
unsigned high = output[i];
high >>= 8;
high &= 0xFF;
unsigned high2 = expected_output[2*i+1];
BOOST_CHECK(high == high2);
}
}
string ref = boost::to_8_bit(output, facet);
BOOST_CHECK(ref == input);
}
int main(int ac, char* av[])
{
std::string input = file_content("utf8.txt");
std::string expected = file_content("ucs2.txt");
test_convert(input, expected);
if (ac > 1) {
cout << "Trying to convert the command line argument\n";
locale::global(locale(""));
std::wstring w = boost::from_local_8_bit(av[1]);
cout << "Got something, printing decimal code point values\n";
for (unsigned i = 0; i < w.size(); ++i) {
cout << (unsigned)w[i] << "\n";
}
}
return 0;
}
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