libutils/source/language/gettext.cpp
2018-03-11 16:44:04 +01:00

257 lines
6.4 KiB
C++

/****************************************************************************
* Copyright (C) 2015 Dimok
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
****************************************************************************/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <string>
#include <vector>
#include "gettext.h"
#include "fs/CFile.hpp"
#include "utils/StringTools.h"
typedef struct _MSG {
u32 id;
char* msgstr;
struct _MSG *next;
} MSG;
static MSG *baseMSG = 0;
#define HASHWORDBITS 32
/* Defines the so called `hashpjw' function by P.J. Weinberger
[see Aho/Sethi/Ullman, COMPILERS: Principles, Techniques and Tools,
1986, 1987 Bell Telephone Laboratories, Inc.] */
static inline u32 hash_string(const char *str_param) {
u32 hval, g;
const char *str = str_param;
/* Compute the hash value for the given string. */
hval = 0;
while (*str != '\0') {
hval <<= 4;
hval += (u8) *str++;
g = hval & ((u32) 0xf << (HASHWORDBITS - 4));
if (g != 0) {
hval ^= g >> (HASHWORDBITS - 8);
hval ^= g;
}
}
return hval;
}
/* Expand some escape sequences found in the argument string. */
static char *
expand_escape(const char *str) {
char *retval, *rp;
const char *cp = str;
retval = (char *) malloc(strlen(str) + 1);
if (retval == NULL) return NULL;
rp = retval;
while (cp[0] != '\0' && cp[0] != '\\')
*rp++ = *cp++;
if (cp[0] == '\0') goto terminate;
do {
/* Here cp[0] == '\\'. */
switch (*++cp) {
case '\"': /* " */
*rp++ = '\"';
++cp;
break;
case 'a': /* alert */
*rp++ = '\a';
++cp;
break;
case 'b': /* backspace */
*rp++ = '\b';
++cp;
break;
case 'f': /* form feed */
*rp++ = '\f';
++cp;
break;
case 'n': /* new line */
*rp++ = '\n';
++cp;
break;
case 'r': /* carriage return */
*rp++ = '\r';
++cp;
break;
case 't': /* horizontal tab */
*rp++ = '\t';
++cp;
break;
case 'v': /* vertical tab */
*rp++ = '\v';
++cp;
break;
case '\\':
*rp = '\\';
++cp;
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7': {
int ch = *cp++ - '0';
if (*cp >= '0' && *cp <= '7') {
ch *= 8;
ch += *cp++ - '0';
if (*cp >= '0' && *cp <= '7') {
ch *= 8;
ch += *cp++ - '0';
}
}
*rp = ch;
}
break;
default:
*rp = '\\';
break;
}
while (cp[0] != '\0' && cp[0] != '\\')
*rp++ = *cp++;
} while (cp[0] != '\0');
/* Terminate string. */
terminate:
*rp = '\0';
return retval;
}
static MSG *findMSG(u32 id) {
MSG *msg;
for (msg = baseMSG; msg; msg = msg->next) {
if (msg->id == id) return msg;
}
return NULL;
}
static MSG *setMSG(const char *msgid, const char *msgstr) {
u32 id = hash_string(msgid);
MSG *msg = findMSG(id);
if (!msg) {
msg = (MSG *) malloc(sizeof(MSG));
msg->id = id;
msg->msgstr = NULL;
msg->next = baseMSG;
baseMSG = msg;
}
if (msg) {
if (msgstr) {
if (msg->msgstr) free(msg->msgstr);
//msg->msgstr = strdup(msgstr);
msg->msgstr = expand_escape(msgstr);
}
return msg;
}
return NULL;
}
extern "C" void gettextCleanUp(void) {
while (baseMSG) {
MSG *nextMsg = baseMSG->next;
free(baseMSG->msgstr);
free(baseMSG);
baseMSG = nextMsg;
}
}
extern "C" bool gettextLoadLanguage(const char* langFile) {
char *lastID = NULL;
gettextCleanUp();
CFile file(langFile, CFile::ReadOnly);
if (!file.isOpen())
return false;
std::string strBuffer;
strBuffer.resize(file.size());
file.read((u8 *) &strBuffer[0], strBuffer.size());
file.close();
//! remove all windows crap signs
size_t position;
while(1) {
position = strBuffer.find('\r');
if(position == std::string::npos)
break;
strBuffer.erase(position, 1);
}
std::vector<std::string> lines = StringTools::stringSplit(strBuffer, "\n");
if(lines.empty())
return false;
for(unsigned int i = 0; i < lines.size(); i++) {
std::string & line = lines[i];
// lines starting with # are comments
if (line[0] == '#')
continue;
else if (strncmp(line.c_str(), "msgid \"", 7) == 0) {
char *msgid, *end;
if (lastID) {
free(lastID);
lastID = NULL;
}
msgid = &line[7];
end = strrchr(msgid, '"');
if (end && end - msgid > 1) {
*end = 0;
lastID = strdup(msgid);
}
} else if (strncmp(line.c_str(), "msgstr \"", 8) == 0) {
char *msgstr, *end;
if (lastID == NULL) continue;
msgstr = &line[8];
end = strrchr(msgstr, '"');
if (end && end - msgstr > 1) {
*end = 0;
setMSG(lastID, msgstr);
}
free(lastID);
lastID = NULL;
}
}
return true;
}
extern "C" const char *gettext(const char *msgid) {
if(!msgid) return NULL;
MSG *msg = findMSG(hash_string(msgid));
if (msg && msg->msgstr) return msg->msgstr;
return msgid;
}