icuSources/common/locresdata.cpp

   1 /*
   2 *******************************************************************************
   3 *
   4 *   Copyright (C) 1997-2010, International Business Machines
   5 *   Corporation and others.  All Rights Reserved.
   6 *
   7 *******************************************************************************
   8 *   file name:  loclikely.cpp
   9 *   encoding:   US-ASCII
  10 *   tab size:   8 (not used)
  11 *   indentation:4
  12 *
  13 *   created on: 2010feb25
  14 *   created by: Markus W. Scherer
  15 *
  16 *   Code for miscellaneous locale-related resource bundle data access,
  17 *   separated out from other .cpp files
  18 *   that then do not depend on resource bundle code and this data.
  19 */
  20
  21 #include "unicode/utypes.h"
  22 #include "unicode/putil.h"
  23 #include "unicode/uloc.h"
  24 #include "unicode/ures.h"
  25 #include "cstring.h"
  26 #include "ulocimp.h"
  27 #include "uresimp.h"
  28
  29 /*
  30  * Lookup a resource bundle table item with fallback on the table level.
  31  * Regular resource bundle lookups perform fallback to parent locale bundles
  32  * and eventually the root bundle, but only for top-level items.
  33  * This function takes the name of a top-level table and of an item in that table
  34  * and performs a lookup of both, falling back until a bundle contains a table
  35  * with this item.
  36  *
  37  * Note: Only the opening of entire bundles falls back through the default locale
  38  * before root. Once a bundle is open, item lookups do not go through the
  39  * default locale because that would result in a mix of languages that is
  40  * unpredictable to the programmer and most likely useless.
  41  */
  42 U_CAPI const UChar * U_EXPORT2
  43 uloc_getTableStringWithFallback(const char *path, const char *locale,
  44                               const char *tableKey, const char *subTableKey,
  45                               const char *itemKey,
  46                               int32_t *pLength,
  47                               UErrorCode *pErrorCode)
  48 {
  49 /*    char localeBuffer[ULOC_FULLNAME_CAPACITY*4];*/
  50     UResourceBundle *rb=NULL, table, subTable;
  51     const UChar *item=NULL;
  52     UErrorCode errorCode;
  53     char explicitFallbackName[ULOC_FULLNAME_CAPACITY] = {0};
  54
  55     /*
  56      * open the bundle for the current locale
  57      * this falls back through the locale's chain to root
  58      */
  59     errorCode=U_ZERO_ERROR;
  60     rb=ures_open(path, locale, &errorCode);
  61
  62     if(U_FAILURE(errorCode)) {
  63         /* total failure, not even root could be opened */
  64         *pErrorCode=errorCode;
  65         return NULL;
  66     } else if(errorCode==U_USING_DEFAULT_WARNING ||
  67                 (errorCode==U_USING_FALLBACK_WARNING && *pErrorCode!=U_USING_DEFAULT_WARNING)
  68     ) {
  69         /* set the "strongest" error code (success->fallback->default->failure) */
  70         *pErrorCode=errorCode;
  71     }
  72
  73     for(;;){
  74         ures_initStackObject(&table);
  75         ures_initStackObject(&subTable);
  76         ures_getByKeyWithFallback(rb, tableKey, &table, &errorCode);
  77
  78         if (subTableKey != NULL) {
  79             /*
  80             ures_getByKeyWithFallback(&table,subTableKey, &subTable, &errorCode);
  81             item = ures_getStringByKeyWithFallback(&subTable, itemKey, pLength, &errorCode);
  82             if(U_FAILURE(errorCode)){
  83                 *pErrorCode = errorCode;
  84             }
  85
  86             break;*/
  87
  88             ures_getByKeyWithFallback(&table,subTableKey, &table, &errorCode);
  89         }
  90         if(U_SUCCESS(errorCode)){
  91             item = ures_getStringByKeyWithFallback(&table, itemKey, pLength, &errorCode);
  92             if(U_FAILURE(errorCode)){
  93                 const char* replacement = NULL;
  94                 *pErrorCode = errorCode; /*save the errorCode*/
  95                 errorCode = U_ZERO_ERROR;
  96                 /* may be a deprecated code */
  97                 if(uprv_strcmp(tableKey, "Countries")==0){
  98                     replacement =  uloc_getCurrentCountryID(itemKey);
  99                 }else if(uprv_strcmp(tableKey, "Languages")==0){
 100                     replacement =  uloc_getCurrentLanguageID(itemKey);
 101                 }
 102                 /*pointer comparison is ok since uloc_getCurrentCountryID & uloc_getCurrentLanguageID return the key itself is replacement is not found*/
 103                 if(replacement!=NULL && itemKey != replacement){
 104                     item = ures_getStringByKeyWithFallback(&table, replacement, pLength, &errorCode);
 105                     if(U_SUCCESS(errorCode)){
 106                         *pErrorCode = errorCode;
 107                         break;
 108                     }
 109                 }
 110             }else{
 111                 break;
 112             }
 113         }
 114
 115         if(U_FAILURE(errorCode)){
 116
 117             /* still can't figure out ?.. try the fallback mechanism */
 118             int32_t len = 0;
 119             const UChar* fallbackLocale =  NULL;
 120             *pErrorCode = errorCode;
 121             errorCode = U_ZERO_ERROR;
 122
 123             fallbackLocale = ures_getStringByKeyWithFallback(&table, "Fallback", &len, &errorCode);
 124             if(U_FAILURE(errorCode)){
 125                *pErrorCode = errorCode;
 126                 break;
 127             }
 128
 129             u_UCharsToChars(fallbackLocale, explicitFallbackName, len);
 130
 131             /* guard against recursive fallback */
 132             if(uprv_strcmp(explicitFallbackName, locale)==0){
 133                 *pErrorCode = U_INTERNAL_PROGRAM_ERROR;
 134                 break;
 135             }
 136             ures_close(rb);
 137             rb = ures_open(path, explicitFallbackName, &errorCode);
 138             if(U_FAILURE(errorCode)){
 139                 *pErrorCode = errorCode;
 140                 break;
 141             }
 142             /* succeeded in opening the fallback bundle .. continue and try to fetch the item */
 143         }else{
 144             break;
 145         }
 146     }
 147     /* done with the locale string - ready to close table and rb */
 148     ures_close(&subTable);
 149     ures_close(&table);
 150     ures_close(rb);
 151     return item;
 152 }
 153
 154 static ULayoutType
 155 _uloc_getOrientationHelper(const char* localeId,
 156                            const char* key,
 157                            UErrorCode *status)
 158 {
 159     ULayoutType result = ULOC_LAYOUT_UNKNOWN;
 160
 161     if (!U_FAILURE(*status)) {
 162         int32_t length = 0;
 163         char localeBuffer[ULOC_FULLNAME_CAPACITY];
 164
 165         uloc_canonicalize(localeId, localeBuffer, sizeof(localeBuffer), status);
 166
 167         if (!U_FAILURE(*status)) {
 168             const UChar* const value =
 169                 uloc_getTableStringWithFallback(
 170                     NULL,
 171                     localeBuffer,
 172                     "layout",
 173                     NULL,
 174                     key,
 175                     &length,
 176                     status);
 177
 178             if (!U_FAILURE(*status) && length != 0) {
 179                 switch(value[0])
 180                 {
 181                 case 0x0062: /* 'b' */
 182                     result = ULOC_LAYOUT_BTT;
 183                     break;
 184                 case 0x006C: /* 'l' */
 185                     result = ULOC_LAYOUT_LTR;
 186                     break;
 187                 case 0x0072: /* 'r' */
 188                     result = ULOC_LAYOUT_RTL;
 189                     break;
 190                 case 0x0074: /* 't' */
 191                     result = ULOC_LAYOUT_TTB;
 192                     break;
 193                 default:
 194                     *status = U_INTERNAL_PROGRAM_ERROR;
 195                     break;
 196                 }
 197             }
 198         }
 199     }
 200
 201     return result;
 202 }
 203
 204 U_DRAFT ULayoutType U_EXPORT2
 205 uloc_getCharacterOrientation(const char* localeId,
 206                              UErrorCode *status)
 207 {
 208     return _uloc_getOrientationHelper(localeId, "characters", status);
 209 }
 210
 211 /**
 212  * Get the layout line orientation for the specified locale.
 213  *
 214  * @param localeID locale name
 215  * @param status Error status
 216  * @return an enum indicating the layout orientation for lines.
 217  * @stable ICU 4.0
 218  */
 219 U_DRAFT ULayoutType U_EXPORT2
 220 uloc_getLineOrientation(const char* localeId,
 221                         UErrorCode *status)
 222 {
 223     return _uloc_getOrientationHelper(localeId, "lines", status);
 224 }