+
+
+struct icu_chain_step * icu_chain_insert_step(struct icu_chain * chain,
+ enum icu_chain_step_type type,
+ const uint8_t * rule,
+ UErrorCode *status)
+{
+ struct icu_chain_step * step = 0;
+ struct icu_buf_utf16 * src16 = 0;
+ struct icu_buf_utf16 * buf16 = 0;
+
+ if (!chain || !type || !rule)
+ return 0;
+
+ // assign utf16 src buffers as needed
+ if (chain->steps && chain->steps->buf16)
+ src16 = chain->steps->buf16;
+ else if (chain->src16)
+ src16 = chain->src16;
+ else
+ return 0;
+
+
+ // create utf16 destination buffers as needed, or
+ switch(type) {
+ case ICU_chain_step_type_display:
+ buf16 = src16;
+ break;
+ case ICU_chain_step_type_norm:
+ buf16 = src16;
+ break;
+ case ICU_chain_step_type_sort:
+ buf16 = src16;
+ break;
+ case ICU_chain_step_type_casemap:
+ buf16 = icu_buf_utf16_create(0);
+ break;
+ case ICU_chain_step_type_normalize:
+ buf16 = icu_buf_utf16_create(0);
+ break;
+ case ICU_chain_step_type_tokenize:
+ buf16 = icu_buf_utf16_create(0);
+ break;
+ default:
+ break;
+ }
+
+ // create actual chain step with this buffer
+ step = icu_chain_step_create(chain, type, rule, buf16, status);
+
+ step->previous = chain->steps;
+ chain->steps = step;
+
+ return step;
+};
+
+
+int icu_chain_step_next_token(struct icu_chain * chain,
+ struct icu_chain_step * step,
+ UErrorCode *status)
+{
+ struct icu_buf_utf16 * src16 = 0;
+
+ //printf("icu_chain_step_next_token %d\n", (int) step);
+
+ if (!chain || !chain->src16 || !step || !step->more_tokens)
+ return 0;
+
+ // assign utf16 src buffers as neeed, advance in previous steps
+ // tokens until non-zero token met, and setting stop condition
+ if (step->previous){
+ src16 = step->previous->buf16;
+ if (step->need_new_token)
+ //while (step->more_tokens && !src16->utf16_len)
+ step->more_tokens
+ = icu_chain_step_next_token(chain, step->previous, status);
+ }
+ else { // first step can only work once on chain->src16 input buffer
+ src16 = chain->src16;
+ step->more_tokens = 1;
+ }
+
+ // stop if nothing to process
+ // i.e new token source was not properly assigned
+ if (!step->more_tokens || !src16) // || !src16->utf16_len
+ return 0;
+
+ //printf("icu_chain_step_next_token %d working\n", (int) step);
+
+
+ // perform the work, eventually put this steps output in
+ // step->buf16 or the chains UTF8 output buffers
+ switch(step->type) {
+ case ICU_chain_step_type_display:
+ icu_utf16_to_utf8(chain->display8, src16, status);
+ break;
+ case ICU_chain_step_type_norm:
+ icu_utf16_to_utf8(chain->norm8, src16, status);
+ break;
+ case ICU_chain_step_type_sort:
+ icu_utf16_to_utf8(chain->sort8, src16, status);
+ break;
+ case ICU_chain_step_type_casemap:
+ icu_casemap_casemap(step->u.casemap,
+ step->buf16, src16, status);
+ break;
+ case ICU_chain_step_type_normalize:
+ icu_normalizer_normalize(step->u.normalizer,
+ step->buf16, src16, status);
+ break;
+ case ICU_chain_step_type_tokenize:
+ // attach to new src16 token only first time during splitting
+ if (step->need_new_token){
+ icu_tokenizer_attach(step->u.tokenizer, src16, status);
+ step->need_new_token = 0;
+ }
+ // splitting one src16 token into multiple buf16 tokens
+ step->more_tokens
+ = icu_tokenizer_next_token(step->u.tokenizer,
+ step->buf16, status);
+ // make sure to get new previous token if this one had been used up
+ if (step->previous && !step->more_tokens){
+ if (icu_chain_step_next_token(chain, step->previous, status)){
+ icu_tokenizer_attach(step->u.tokenizer, src16, status);
+ step->need_new_token = 0;
+ step->more_tokens
+ = icu_tokenizer_next_token(step->u.tokenizer,
+ step->buf16, status);
+ }
+ }
+ if (0 == step->more_tokens)
+ return 0;
+ break;
+ default:
+ return 0;
+ break;
+ }
+
+
+
+ // stop further token processing if last step and
+ // new tokens are needed from previous (non-existing) step
+ if (!step->previous && step->need_new_token)
+ step->more_tokens = 0;
+
+ //printf("%d %d %d\n",
+ // step->more_tokens, src16->utf16_len, step->buf16->utf16_len);
+
+
+ if (U_FAILURE(*status))
+ return 0;
+
+ return 1;
+};
+
+
+
+int icu_chain_assign_cstr(struct icu_chain * chain,
+ const char * src8cstr,
+ UErrorCode *status)
+{
+ struct icu_chain_step * stp = 0;
+
+ if (!chain || !src8cstr)
+ return 0;
+
+ stp = chain->steps;
+
+ // clear token count
+ chain->token_count = 0;
+
+ // clear all steps stop states
+
+ while (stp){
+ stp->more_tokens = 1;
+ stp->need_new_token = 1;
+ stp = stp->previous;
+ }
+
+ // finally convert UTF8 to UTF16 string
+ icu_utf16_from_utf8_cstr(chain->src16, src8cstr, status);
+
+ if (U_FAILURE(*status))
+ return 0;
+
+ return 1;
+};
+
+
+
+int icu_chain_next_token(struct icu_chain * chain,
+ UErrorCode *status)
+{
+ int success = 0;
+
+ if (!chain || !chain->steps)
+ return 0;
+
+ success = icu_chain_step_next_token(chain, chain->steps, status);
+
+ if (success){
+ chain->token_count++;
+ return chain->token_count;
+ }
+
+ return 0;
+};
+
+int icu_chain_get_token_count(struct icu_chain * chain)
+{
+ if (!chain)
+ return 0;
+
+ return chain->token_count;
+};
+
+
+
+const char * icu_chain_get_display(struct icu_chain * chain)
+{
+ if (chain->display8)
+ return (const char *) chain->display8->utf8;
+
+ return 0;
+};
+
+const char * icu_chain_get_norm(struct icu_chain * chain)
+{
+ if (chain->norm8)
+ return (const char *) chain->norm8->utf8;
+
+ return 0;
+};
+
+const char * icu_chain_get_sort(struct icu_chain * chain)
+{
+ if (chain->sort8)
+ return (const char *) chain->sort8->utf8;
+
+ return 0;
+};