Pass some const strings by reference

[libi2ncommon] / src / i18n.cpp

/*
The software in this package is distributed under the GNU General
Public License version 2 (with a special exception described below).

A copy of GNU General Public License (GPL) is included in this distribution,
in the file COPYING.GPL.

As a special exception, if other files instantiate templates or use macros
or inline functions from this file, or you compile this file and link it
with other works to produce a work based on this file, this file
does not by itself cause the resulting work to be covered
by the GNU General Public License.

However the source code for this file must still be made available
in accordance with section (3) of the GNU General Public License.

This exception does not invalidate any other reasons why a work based
on this file might be covered by the GNU General Public License.
*/
/***************************************************************************
                          i18n.cpp  -  description
                             -------------------
    begin                : Wed Apr 25 2001
    copyright            : (C) 2001-2004 by Intra2net AG
 ***************************************************************************/

#include <sstream>
#include <string>
#include <vector>
#include <iostream>
#include <fstream>

#include <time.h>
#include <stdlib.h>
#include <string.h>
#include "i18n.h"

#define DEFAULT_LANG "en_EN"

using namespace std;

void i18n_init (const string& domain, const string& path)
{
   i18n_set_language (i18n_get_default_language());

   bindtextdomain (domain.c_str(), path.c_str());
   textdomain (domain.c_str());
}

void i18n_set_language (const string &lang)
{
   string target;

   if (lang.empty())
      target=DEFAULT_LANG;
   else
   {
      if (lang=="NULL")
         target="";
      else
         target=lang;
   }

   if (target.empty())
      setlocale(LC_ALL,"C");
   else
      setlocale(LC_ALL,target.c_str());

    // Flush gcc based gettext caching. Code is from the -GNU-
    // gettext manual in the "being a gettext grok" chapter.
    {
        extern int  _nl_msg_cat_cntr;
        ++_nl_msg_cat_cntr;
    }

   return;
}

// empty string returned: no language set
string i18n_get_current_language(void)
{
   string lng;
   char* env=setlocale(LC_ALL,NULL);

   if (env != NULL)
   {
      if (strcmp(env,"C")==0)
         lng="NULL";
      else
         lng=env;
   }
   else
      lng="NULL";

   return lng;
}

// empty string returned: no language set
string i18n_get_default_language(void)
{
    string lang;

    ifstream in("/usr/intranator/etc/locale");
    if (in)
    {
        getline (in, lang);

        if (lang.empty())
            lang=DEFAULT_LANG;
        in.close(); 
    }

    return lang;
}

void i18n_get_string(const char *source, string &target, const vector<string> &data) {
    string src = string (source);
    i18n_get_string (src, target, data);
}

string i18n_get_string(const char *source, const vector<string> &data) {
    string target;
    string src = string (source);
    i18n_get_string (src, target, data);
    return target;
}

string i18n_get_string(const string &source, const vector<string> &data) {
    string target;
    i18n_get_string (source, target, data);
    return target;
}

void i18n_get_string(const string &source, string &target, const vector<string> &data)
{
	string::size_type p=0, slen=0;
	string dollar="$";

	// custom vars
	string text = source;

	target=text;

	while ((p=target.find('$',p))!=string::npos)
	{
		const string *ins;

		if (target.size() < p)
		{
			ostringstream os;
			os << "i18n syntax error: $ without number at pos ->" << p << "<- in string ->" << text << "<-";
			target = os.str();
			return;
		}			

		// find string to insert (=ins)
		if (target.at(p+1)=='$')
		{
			ins=&dollar;      	
			slen=2;
		}
		else
		{
			slen=target.find_first_not_of("0123456789",p+1);

			if (slen==string::npos)
         	slen=target.size();

			if (slen==p+1)
			{
				ostringstream os;
				os << "i18n syntax error: $ without number at pos ->" << p << "<- in string ->" << text << "<-";
				target = os.str();
				return;
			}			

			slen-=p;
			istringstream is(target.substr(p+1,slen-1));
			unsigned int dnr;

			is >> dnr;

			if (is.fail())
			{
				ostringstream os;
				os << "i18n syntax error: error reading number at pos ->" << p << "<- in string ->" << text << "<-";
				target = os.str();
				return;
			}			

			if (dnr+1 > data.size())
			{
				ostringstream os;
				os << "i18n parameter error: missing variable ->$" << dnr << "<- in string ->" << text << "<-";
				target = os.str();
				return;
			}			

			ins=&(data.at(dnr));
		}

		target.replace(p,slen,*ins);
		p=p+ins->size();
	}
}

// convert locale to language (de_DE -> de)
string i18n_locale2language(const string &locale)
{
    // search for "_"
    string::size_type pos = locale.find("_");
    if (pos == string::npos)
        return locale;

    return(locale.substr(0, pos));
}