src/Messages.cpp

   1 /* \file Messages.cpp
   2  * This file is part of LyX, the document processor.
   3  * Licence details can be found in the file COPYING.
   4  *
   5  * \author Lars Gullik Bjønnes
   6  *
   7  * Full author contact details are available in file CREDITS.
   8  */
   9
  10 #include <config.h>
  11
  12 #include "Messages.h"
  13
  14 #include "debug.h"
  15
  16 #include "support/docstring.h"
  17 #include "support/environment.h"
  18 #include "support/filetools.h"
  19 #include "support/Package.h"
  20 #include "support/unicode.h"
  21
  22 #include <boost/current_function.hpp>
  23 #include <boost/regex.hpp>
  24
  25 #include <cerrno>
  26
  27 namespace {
  28 boost::regex const reg("^([^\\[]*)\\[\\[[^\\]]*\\]\\]$");
  29 };
  30
  31 #ifdef ENABLE_NLS
  32
  33 #ifdef HAVE_LOCALE_H
  34 #  include <locale.h>
  35 #endif
  36
  37 #  if HAVE_GETTEXT
  38 #    include <libintl.h>      // use the header already in the system *EK*
  39 #  else
  40 #    include "../intl/libintl.h"
  41 #  endif
  42
  43 using std::endl;
  44 using std::make_pair;
  45 using std::map;
  46 using std::string;
  47
  48 namespace lyx {
  49
  50 using support::package;
  51 using support::getEnv;
  52 using support::setEnv;
  53
  54
  55 // This version use the traditional gettext.
  56 Messages::Messages(string const & l)
  57         : lang_(l), warned_(false)
  58 {
  59         if ( lang_.empty() ) {
  60                 char const * lc_msgs = 0;
  61 #ifdef HAVE_LC_MESSAGES
  62                 lc_msgs = setlocale(LC_MESSAGES, NULL);
  63 #endif
  64                 lang_ = lc_msgs ? lc_msgs : "";
  65         }
  66         // strip off any encoding suffix, i.e., assume 8-bit po files
  67         string::size_type i = lang_.find(".");
  68         lang_ = lang_.substr(0, i);
  69         LYXERR(Debug::DEBUG) << BOOST_CURRENT_FUNCTION
  70                 << ": language(" << lang_ << ")" << endl;
  71 }
  72
  73
  74 docstring const Messages::get(string const & m) const
  75 {
  76         if (m.empty())
  77                 return docstring();
  78
  79         // Look for the translated string in the cache.
  80         TranslationCache::iterator it = cache_.find(m);
  81         if (it != cache_.end())
  82                 return it->second;
  83         // The string was not found, use gettext to generate it:
  84
  85         // In this order, see support/filetools.cpp:
  86         string lang = getEnv("LC_ALL");
  87         if (lang.empty()) {
  88                 lang = getEnv("LC_MESSAGES");
  89                 if (lang.empty()) {
  90                         lang = getEnv("LANG");
  91                         if (lang.empty())
  92                                 lang = "C";
  93                 }
  94         }
  95 #ifdef HAVE_LC_MESSAGES
  96         char const * lc_msgs = setlocale(LC_MESSAGES, lang_.c_str());
  97 #endif
  98         // setlocale fails (returns NULL) if the corresponding locale
  99         // is not installed.
 100         // On windows (mingw and cygwin) it always returns NULL.
 101         // Since this method gets called for every translatable
 102         // buffer string like e.g. "Figure:" we warn only once.
 103 #if !defined(_WIN32) && !defined(__CYGWIN__)
 104         if (!warned_ && !lc_msgs) {
 105                 warned_ = true;
 106                 lyxerr << "Locale " << lang_ << " could not be set" << endl;
 107         }
 108 #endif
 109         // CTYPE controls what getmessage thinks what encoding the po file uses
 110         char const * lc_ctype = setlocale(LC_CTYPE, NULL);
 111         string oldCTYPE = lc_ctype ? lc_ctype : "";
 112
 113         setlocale(LC_CTYPE, lang_.c_str());
 114         errno = 0;
 115         string const locale_dir = package().locale_dir().toFilesystemEncoding();
 116         char const * c = bindtextdomain(PACKAGE, locale_dir.c_str());
 117         int e = errno;
 118         if (e) {
 119                 LYXERR(Debug::DEBUG)
 120                 << BOOST_CURRENT_FUNCTION << '\n'
 121                         << "Error code: " << errno << '\n'
 122                         << "Lang, mess: " << lang_ << " " << m << '\n'
 123                         << "Directory : " << package().locale_dir().absFilename() << '\n'
 124                         << "Rtn value : " << c << endl;
 125         }
 126
 127         if (!bind_textdomain_codeset(PACKAGE, ucs4_codeset)) {
 128                 LYXERR(Debug::DEBUG)
 129                 << BOOST_CURRENT_FUNCTION << '\n'
 130                         << "Error code: " << errno << '\n'
 131                         << "Codeset   : " << ucs4_codeset << '\n'
 132                         << endl;
 133         }
 134
 135         textdomain(PACKAGE);
 136         char const * tmp = m.c_str();
 137         char const * msg = gettext(tmp);
 138         docstring translated;
 139         if (!msg || msg == tmp) {
 140                 if (!msg)
 141                         lyxerr << "Undefined result from gettext" << endl;
 142                 //else
 143                 //      lyxerr << "Same as entered returned" << endl;
 144                 // Some english words have different translations,
 145                 // depending on context. In these cases the original
 146                 // string is augmented by context information (e.g.
 147                 // "To:[[as in 'From page x to page y']]" and
 148                 // "To:[[as in 'From format x to format y']]".
 149                 // This means that we need to filter out everything
 150                 // in double square brackets at the end of the
 151                 // string, otherwise the user sees bogus messages.
 152                 // If we are unable to honour the request we just
 153                 // return what we got in.
 154                 boost::smatch sub;
 155                 if (regex_match(m, sub, reg))
 156                         translated = from_ascii(sub.str(1));
 157                 else
 158                         translated = from_ascii(tmp);
 159         } else {
 160                 LYXERR(Debug::DEBUG) << "We got a translation" << endl;
 161                 char_type const * ucs4 = reinterpret_cast<char_type const *>(msg);
 162                 translated = ucs4;
 163         }
 164 #ifdef HAVE_LC_MESSAGES
 165         setlocale(LC_MESSAGES, lang.c_str());
 166 #endif
 167         setlocale(LC_CTYPE, oldCTYPE.c_str());
 168
 169         std::pair<TranslationCache::iterator, bool> result =
 170                 cache_.insert(std::make_pair(m, translated));
 171
 172         BOOST_ASSERT(result.second);
 173
 174         return result.first->second;
 175 }
 176
 177 } // namespace lyx
 178
 179 #else // ENABLE_NLS
 180 // This is the dummy variant.
 181
 182 using std::endl;
 183 using std::make_pair;
 184 using std::map;
 185 using std::string;
 186
 187 namespace lyx {
 188
 189 Messages::Messages(string const & l) {}
 190
 191
 192 docstring const Messages::get(string const & m) const
 193 {
 194         // See comment above
 195         boost::smatch sub;
 196         if (regex_match(m, sub, reg))
 197                 return from_ascii(sub.str(1));
 198         else
 199                 return from_ascii(m);
 200 }
 201
 202 } // namespace lyx
 203
 204 #endif
 205
 206 #if 0
 207
 208 -#include <locale>
 209
 210 namespace lyx {
 211
 212 // This version of the Pimpl utilizes the message capability of
 213 // libstdc++ that is distributed with GNU G++.
 214 class Messages::Pimpl {
 215 public:
 216         typedef std::messages<char>::catalog catalog;
 217
 218         Pimpl(string const & l)
 219                 : lang_(l),
 220                   loc_gl(lang_.c_str()),
 221                   mssg_gl(std::use_facet<std::messages<char> >(loc_gl))
 222         {
 223                 //lyxerr << "Messages: language(" << l
 224                 //       << ") in dir(" << dir << ")" << endl;
 225
 226                 string const locale_dir = package().locale_dir().toFilesystemEncoding();
 227                 cat_gl = mssg_gl.open(PACKAGE, loc_gl, locale_dir.c_str());
 228
 229         }
 230
 231         ~Pimpl()
 232         {
 233                 mssg_gl.close(cat_gl);
 234         }
 235
 236         docstring const get(string const & msg) const
 237         {
 238                 return mssg_gl.get(cat_gl, 0, 0, msg);
 239         }
 240 private:
 241         ///
 242         string lang_;
 243         ///
 244         std::locale loc_gl;
 245         ///
 246         std::messages<char> const & mssg_gl;
 247         ///
 248         catalog cat_gl;
 249 };
 250
 251 } // namespace lyx
 252
 253 #endif