96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2020 Taler Systems SA
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* @file json/i18n.c
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* @brief helper functions for i18n in JSON processing
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* @author Christian Grothoff
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*/
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#include "platform.h"
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#include <gnunet/gnunet_util_lib.h>
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#include "taler_util.h"
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#include "taler_json_lib.h"
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/**
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* Extract a string from @a object under the field @a field, but respecting
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* the Taler i18n rules and the language preferences expressed in @a
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* language_pattern.
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*
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* Basically, the @a object may optionally contain a sub-object
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* "${field}_i18n" with a map from IETF BCP 47 language tags to a localized
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* version of the string. If this map exists and contains an entry that
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* matches the @a language pattern, that object (usually a string) is
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* returned. If the @a language_pattern does not match any entry, or if the
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* i18n sub-object does not exist, we simply return @a field of @a object
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* (also usually a string).
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*
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* If @a object does not have a member @a field we return NULL (error).
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*
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* @param object the object to extract internationalized
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* content from
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* @param language_pattern a language preferences string
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* like "fr-CH, fr;q=0.9, en;q=0.8, *;q=0.1", following
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* https://tools.ietf.org/html/rfc7231#section-5.3.1
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* @param field name of the field to extract
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* @return NULL on error, otherwise the member from
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* @a object. Note that the reference counter is
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* NOT incremented.
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*/
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const json_t *
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TALER_JSON_extract_i18n (const json_t *object,
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const char *language_pattern,
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const char *field)
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{
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const json_t *ret;
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json_t *i18n;
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double quality = -1;
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ret = json_object_get (object,
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field);
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if (NULL == ret)
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return NULL; /* field MUST exist in object */
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{
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char *name;
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GNUNET_asprintf (&name,
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"%s_i18n",
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field);
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i18n = json_object_get (object,
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name);
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GNUNET_free (name);
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}
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if (NULL == i18n)
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return ret;
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{
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const char *key;
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json_t *value;
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json_object_foreach (i18n, key, value) {
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double q = TALER_language_matches (language_pattern,
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key);
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if (q > quality)
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{
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quality = q;
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ret = value;
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}
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}
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}
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return ret;
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}
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/* end of i18n.c */
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