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#include "preferred_languages.hpp"
#include "../base/string_utils.hpp"
#include "../base/logging.hpp"
#include "../std/target_os.hpp"
#include "../std/set.hpp"
#if defined(OMIM_OS_MAC) || defined(OMIM_OS_IPHONE)
#include <CoreFoundation/CFLocale.h>
#include <CoreFoundation/CFString.h>
#elif defined(OMIM_OS_WINDOWS)
// @TODO
#elif defined(OMIM_OS_LINUX)
#include "../std/stdlib.hpp"
#else
#error "Define language preferences for your platform"
#endif
namespace languages
{
class LangFilter
{
set<string> & m_known;
public:
LangFilter(set<string> & known) : m_known(known) {}
bool operator()(string const & t)
{
return !m_known.insert(t).second;
}
};
class NormalizeFilter
{
public:
void operator()(string & t)
{
strings::SimpleTokenizer const iter(t, "-_ ");
if (iter)
t = *iter;
else
{
LOG(LWARNING, ("Invalid language"));
}
}
};
void FilterLanguages(vector<string> & langs)
{
// normalize languages: en-US -> en, ru_RU -> ru etc.
for_each(langs.begin(), langs.end(), NormalizeFilter());
{ // tmp storage
set<string> known;
// remove duplicate languages
langs.erase(remove_if(langs.begin(), langs.end(), LangFilter(known)), langs.end());
}
}
void SystemPreferredLanguages(vector<string> & languages)
{
#if defined(OMIM_OS_MAC) || defined(OMIM_OS_IPHONE)
// Mac and iOS implementation
CFArrayRef langs = CFLocaleCopyPreferredLanguages();
char buf[30];
for (CFIndex i = 0; i < CFArrayGetCount(langs); ++i)
{
CFStringRef strRef = (CFStringRef)CFArrayGetValueAtIndex(langs, i);
CFStringGetCString(strRef, buf, 30, kCFStringEncodingUTF8);
languages.push_back(buf);
}
CFRelease(langs);
#elif defined(OMIM_OS_WINDOWS)
// @TODO Windows implementation
#elif defined(OMIM_OS_LINUX)
// check environment variables
char const * p = getenv("LANGUAGE");
if (p) // LANGUAGE can contain several values divided by ':'
{
string const str(p);
strings::SimpleTokenizer iter(str, ":");
while (iter)
{
languages.push_back(*iter);
++iter;
}
}
else if ((p = getenv("LC_ALL")))
languages.push_back(p);
else if ((p = getenv("LC_MESSAGES")))
languages.push_back(p);
else if ((p = getenv("LANG")))
languages.push_back(p);
#else
#error "Define language preferences for your platform"
#endif
FilterLanguages(languages);
}
string PreferredLanguages()
{
vector<string> arr;
SystemPreferredLanguages(arr);
// generate output string
string result;
for (size_t i = 0; i < arr.size(); ++i)
{
result.append(arr[i]);
result.push_back('|');
}
if (result.empty())
result = "default";
else
result.resize(result.size() - 1);
return result;
}
string CurrentLanguage()
{
vector<string> arr;
SystemPreferredLanguages(arr);
if (arr.empty())
return "en";
else
return arr[0];
}
}
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