Inversion*
StandardTokenizer_transform(StandardTokenizer *self, Inversion *inversion) {
Inversion *new_inversion = Inversion_new(NULL);
Token *token;
while (NULL != (token = Inversion_Next(inversion))) {
StandardTokenizer_Tokenize_Str(self, token->text, token->len,
new_inversion);
}
return new_inversion;
}
Inversion*
WhitespaceTokenizer_Transform_IMP(WhitespaceTokenizer *self,
Inversion *inversion) {
Inversion *new_inversion = Inversion_new(NULL);
Token *token;
while (NULL != (token = Inversion_Next(inversion))) {
WhitespaceTokenizer_Tokenize_Str(self, Token_Get_Text(token),
Token_Get_Len(token), new_inversion);
}
return new_inversion;
}
Inversion*
RegexTokenizer_Transform_IMP(RegexTokenizer *self, Inversion *inversion) {
Inversion *new_inversion = Inversion_new(NULL);
Token *token;
while (NULL != (token = Inversion_Next(inversion))) {
TokenIVARS *const token_ivars = Token_IVARS(token);
RegexTokenizer_Tokenize_Utf8(self, token_ivars->text, token_ivars->len,
new_inversion);
}
return new_inversion;
}
Inversion*
Stopalizer_transform(Stopalizer *self, Inversion *inversion)
{
Token *token;
Inversion *new_inversion = Inversion_new(NULL);
Hash *const stoplist = self->stoplist;
while (NULL != (token = Inversion_Next(inversion))) {
if (!Hash_Fetch_Str(stoplist, token->text, token->len)) {
Inversion_Append(new_inversion, (Token*)INCREF(token));
}
}
return new_inversion;
}
Inversion*
SnowStop_Transform_IMP(SnowballStopFilter *self, Inversion *inversion) {
Token *token;
Inversion *new_inversion = Inversion_new(NULL);
SnowballStopFilterIVARS *const ivars = SnowStop_IVARS(self);
Hash *const stoplist = ivars->stoplist;
while (NULL != (token = Inversion_Next(inversion))) {
TokenIVARS *const token_ivars = Token_IVARS(token);
if (!Hash_Fetch_Utf8(stoplist, token_ivars->text, token_ivars->len)) {
Inversion_Append(new_inversion, (Token*)INCREF(token));
}
}
return new_inversion;
}
Inversion*
Normalizer_transform(Normalizer *self, Inversion *inversion) {
// allocate additional space because utf8proc_reencode adds a
// terminating null char
int32_t static_buffer[INITIAL_BUFSIZE + 1];
int32_t *buffer = static_buffer;
ssize_t bufsize = INITIAL_BUFSIZE;
Token *token;
while (NULL != (token = Inversion_Next(inversion))) {
ssize_t len = utf8proc_decompose((uint8_t*)token->text, token->len,
buffer, bufsize, self->options);
if (len > bufsize) {
// buffer too small, (re)allocate
if (buffer != static_buffer) {
FREEMEM(buffer);
}
// allocate additional INITIAL_BUFSIZE items
bufsize = len + INITIAL_BUFSIZE;
buffer = (int32_t*)MALLOCATE((bufsize + 1) * sizeof(int32_t));
len = utf8proc_decompose((uint8_t*)token->text, token->len,
buffer, bufsize, self->options);
}
if (len < 0) {
continue;
}
len = utf8proc_reencode(buffer, len, self->options);
if (len >= 0) {
if (len > (ssize_t)token->len) {
FREEMEM(token->text);
token->text = (char*)MALLOCATE(len + 1);
}
memcpy(token->text, buffer, len + 1);
token->len = len;
}
}
if (buffer != static_buffer) {
FREEMEM(buffer);
}
Inversion_Reset(inversion);
return (Inversion*)INCREF(inversion);
}
Inversion*
SnowStemmer_Transform_IMP(SnowballStemmer *self, Inversion *inversion) {
Token *token;
SnowballStemmerIVARS *const ivars = SnowStemmer_IVARS(self);
struct sb_stemmer *const snowstemmer
= (struct sb_stemmer*)ivars->snowstemmer;
while (NULL != (token = Inversion_Next(inversion))) {
TokenIVARS *const token_ivars = Token_IVARS(token);
const sb_symbol *stemmed_text
= sb_stemmer_stem(snowstemmer, (sb_symbol*)token_ivars->text,
token_ivars->len);
size_t len = sb_stemmer_length(snowstemmer);
if (len > token_ivars->len) {
FREEMEM(token_ivars->text);
token_ivars->text = (char*)MALLOCATE(len + 1);
}
memcpy(token_ivars->text, stemmed_text, len + 1);
token_ivars->len = len;
}
Inversion_Reset(inversion);
return (Inversion*)INCREF(inversion);
}
