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fts-language.c
315 lines (272 loc) · 8.07 KB
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fts-language.c
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/* Copyright (c) 2014-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "array.h"
#include "llist.h"
#include "fts-language.h"
#ifdef HAVE_LIBEXTTEXTCAT_TEXTCAT_H
# include <libexttextcat/textcat.h>
#elif defined (HAVE_FTS_EXTTEXTCAT)
# include <textcat.h>
#endif
#ifndef TEXTCAT_RESULT_UNKNOWN /* old textcat.h has typos */
# ifdef TEXTCAT_RESULT_UNKOWN
# define TEXTCAT_RESULT_UNKNOWN TEXTCAT_RESULT_UNKOWN
# endif
#endif
#define DETECT_STR_MAX_LEN 200
struct fts_language_list {
pool_t pool;
ARRAY_TYPE(fts_language) languages;
const char *textcat_config;
const char *textcat_datadir;
void *textcat_handle;
bool textcat_failed;
};
pool_t fts_languages_pool;
ARRAY_TYPE(fts_language) fts_languages;
/* ISO 639-1 alpha 2 codes for languages */
const struct fts_language fts_languages_builtin [] = {
{ "da" }, /* Danish */
{ "de" }, /* German */
{ "en" }, /* English */
{ "es" }, /* Spanish */
{ "fi" }, /* Finnish */
{ "fr" }, /* French */
{ "it" }, /* Italian */
{ "nl" }, /* Dutch */
{ "no" }, /* Both Bokmal and Nynorsk are detected as Norwegian */
{ "pt" }, /* Portuguese */
{ "ro" }, /* Romanian */
{ "ru" }, /* Russian */
{ "sv" } /* Swedish */
};
const struct fts_language fts_language_data = {
"data"
};
void fts_languages_init(void)
{
unsigned int i;
const struct fts_language *lp;
fts_languages_pool = pool_alloconly_create("fts_language",
sizeof(fts_languages_builtin));
p_array_init(&fts_languages, fts_languages_pool,
N_ELEMENTS(fts_languages_builtin));
for (i = 0; i < N_ELEMENTS(fts_languages_builtin); i++){
lp = &fts_languages_builtin[i];
array_append(&fts_languages, &lp, 1);
}
}
void fts_languages_deinit(void)
{
pool_unref(&fts_languages_pool);
}
void fts_language_register(const char *name)
{
struct fts_language *lang;
if (fts_language_find(name) != NULL)
return;
lang = p_new(fts_languages_pool, struct fts_language, 1);
lang->name = p_strdup(fts_languages_pool, name);
array_append(&fts_languages, (const struct fts_language **)&lang, 1);
}
const struct fts_language *fts_language_find(const char *name)
{
const struct fts_language *const *langp = NULL;
array_foreach(&fts_languages, langp) {
if (strcmp((*langp)->name, name) == 0)
return *langp;
}
return NULL;
}
int fts_language_list_init(const char *const *settings,
struct fts_language_list **list_r,
const char **error_r)
{
struct fts_language_list *lp;
pool_t pool;
unsigned int i;
const char *conf = NULL, *data = NULL;
for (i = 0; settings[i] != NULL; i += 2) {
const char *key = settings[i], *value = settings[i+1];
if (strcmp(key, "fts_language_config") == 0)
conf = value;
else if (strcmp(key, "fts_language_data") == 0)
data = value;
else {
*error_r = t_strdup_printf("Unknown setting: %s", key);
return -1;
}
}
pool = pool_alloconly_create("fts_language_list", 128);
lp = p_new(pool, struct fts_language_list, 1);
lp->pool = pool;
if (conf != NULL)
lp->textcat_config = p_strdup(pool, conf);
else
lp->textcat_config = NULL;
if (data != NULL)
lp->textcat_datadir = p_strdup(pool, data);
else
lp->textcat_datadir = NULL;
p_array_init(&lp->languages, pool, 32);
*list_r = lp;
return 0;
}
void fts_language_list_deinit(struct fts_language_list **list)
{
struct fts_language_list *lp = *list;
*list = NULL;
#ifdef HAVE_FTS_EXTTEXTCAT
if (lp->textcat_handle != NULL)
textcat_Done(lp->textcat_handle);
#endif
pool_unref(&lp->pool);
}
static const struct fts_language *
fts_language_list_find(struct fts_language_list *list, const char *name)
{
const struct fts_language *const *langp;
array_foreach(&list->languages, langp) {
if (strcmp((*langp)->name, name) == 0)
return *langp;
}
return NULL;
}
void fts_language_list_add(struct fts_language_list *list,
const struct fts_language *lang)
{
i_assert(fts_language_list_find(list, lang->name) == NULL);
array_append(&list->languages, &lang, 1);
}
bool fts_language_list_add_names(struct fts_language_list *list,
const char *names,
const char **unknown_name_r)
{
const char *const *langs;
const struct fts_language *lang;
for (langs = t_strsplit_spaces(names, ", "); *langs != NULL; langs++) {
lang = fts_language_find(*langs);
if (lang == NULL) {
/* unknown language */
*unknown_name_r = *langs;
return FALSE;
}
if (fts_language_list_find(list, lang->name) == NULL)
fts_language_list_add(list, lang);
}
return TRUE;
}
const ARRAY_TYPE(fts_language) *
fts_language_list_get_all(struct fts_language_list *list)
{
return &list->languages;
}
const struct fts_language *
fts_language_list_get_first(struct fts_language_list *list)
{
const struct fts_language *const *langp;
langp = array_first(&list->languages);
return *langp;
}
#ifdef HAVE_FTS_EXTTEXTCAT
static bool fts_language_match_lists(struct fts_language_list *list,
candidate_t *candp, int candp_len,
const struct fts_language **lang_r)
{
const char *name;
for (int i = 0; i < candp_len; i++) {
/* name is <lang>-<optional country or characterset>-<encoding>
eg, fi--utf8 or pt-PT-utf8 */
name = t_strcut(candp[i].name, '-');
/* For Norwegian we treat both bokmal and nynorsk as "no". */
if (strcmp(name, "nb") == 0 || strcmp(name, "nn") == 0)
name = "no";
if ((*lang_r = fts_language_list_find(list, name)) != NULL)
return TRUE;
}
return FALSE;
}
#endif
#ifdef HAVE_FTS_EXTTEXTCAT
static int fts_language_textcat_init(struct fts_language_list *list)
{
const char *config_path;
const char *data_dir;
if (list->textcat_handle != NULL)
return 0;
if (list->textcat_failed)
return -1;
config_path = list->textcat_config != NULL ? list->textcat_config :
TEXTCAT_DATADIR"/fpdb.conf";
data_dir = list->textcat_datadir != NULL ? list->textcat_datadir :
TEXTCAT_DATADIR"/";
list->textcat_handle = special_textcat_Init(config_path, data_dir);
if (list->textcat_handle == NULL) {
i_error("special_textcat_Init(%s, %s) failed",
config_path, data_dir);
list->textcat_failed = TRUE;
return -1;
}
/* The textcat minimum document size could be set here. It
currently defaults to 3. UTF8 is enabled by default. */
return 0;
}
#endif
static enum fts_language_result
fts_language_detect_textcat(struct fts_language_list *list ATTR_UNUSED,
const unsigned char *text ATTR_UNUSED,
size_t size ATTR_UNUSED,
const struct fts_language **lang_r ATTR_UNUSED)
{
#ifdef HAVE_FTS_EXTTEXTCAT
candidate_t *candp; /* textcat candidate result array pointer */
int cnt;
bool match = FALSE;
if (fts_language_textcat_init(list) < 0)
return FTS_LANGUAGE_RESULT_ERROR;
candp = textcat_GetClassifyFullOutput(list->textcat_handle);
if (candp == NULL)
i_fatal_status(FATAL_OUTOFMEM, "textcat_GetCLassifyFullOutput failed: malloc() returned NULL");
cnt = textcat_ClassifyFull(list->textcat_handle, (const void *)text,
I_MIN(size, DETECT_STR_MAX_LEN), candp);
if (cnt > 0) {
T_BEGIN {
match = fts_language_match_lists(list, candp, cnt, lang_r);
} T_END;
textcat_ReleaseClassifyFullOutput(list->textcat_handle, candp);
if (match)
return FTS_LANGUAGE_RESULT_OK;
else
return FTS_LANGUAGE_RESULT_UNKNOWN;
} else {
textcat_ReleaseClassifyFullOutput(list->textcat_handle, candp);
switch (cnt) {
case TEXTCAT_RESULT_SHORT:
i_assert(size < DETECT_STR_MAX_LEN);
return FTS_LANGUAGE_RESULT_SHORT;
case TEXTCAT_RESULT_UNKNOWN:
return FTS_LANGUAGE_RESULT_UNKNOWN;
default:
i_unreached();
}
}
#else
return FTS_LANGUAGE_RESULT_UNKNOWN;
#endif
}
enum fts_language_result
fts_language_detect(struct fts_language_list *list,
const unsigned char *text ATTR_UNUSED,
size_t size ATTR_UNUSED,
const struct fts_language **lang_r)
{
i_assert(array_count(&list->languages) > 0);
/* if there's only a single wanted language, return it always. */
if (array_count(&list->languages) == 1) {
const struct fts_language *const *langp =
array_first(&list->languages);
*lang_r = *langp;
return FTS_LANGUAGE_RESULT_OK;
}
return fts_language_detect_textcat(list, text, size, lang_r);
}