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dl_re.c
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dl_re.c
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#include "dl_base.h"
#include "dl_re.h"
pcre2_code *
dl_compile_re(char *pattern, size_t len, dl_log *log){
PCRE2_SIZE erroroffset;
int errornumber;
pcre2_code *re;
re = pcre2_compile(pattern, len, 0, &errornumber, &erroroffset, NULL);
if(re == NULL){
if(log){
PCRE2_UCHAR buffer[256];
pcre2_get_error_message(errornumber, buffer, sizeof(buffer));
dl_log_error(DL_LOG_ERR, log,
"PCRE2 compilation failed at offset %d: %s", (int)erroroffset, buffer);
}
return NULL;
}
return re;
}
/* replace string */
dl_str *
dl_str_replace_re(dl_pool *p, char *s1, size_t len,
char *pattern,
char *s3, size_t len_3, pcre2_code *rep)
{
dl_pool *tmp_p;
dl_str *str, *res_s;
char *res, *cur;
dl_list *list;
dl_list_part *part;
PCRE2_SIZE erroroffset;
PCRE2_SIZE *ovector;
int total, errornumber, rc, offset, option;
pcre2_match_data *match_data;
pcre2_code *re;
re = rep;
res_s = dl_palloc(p, sizeof(dl_str));
if(*pattern == '\0'){
res_s->data = dl_pstrdup(p, s1, len);
res_s->len = len;
return res_s;
}
tmp_p = dl_create_pool(1024, NULL);
if(tmp_p == NULL) return NULL;
list = dl_list_create(tmp_p, 1, sizeof(dl_str));
if(list == NULL) return NULL;
if(rep == NULL){
re = pcre2_compile(pattern, PCRE2_ZERO_TERMINATED, 0, &errornumber, &erroroffset, NULL);
if(re == NULL){
PCRE2_UCHAR buffer[256];
pcre2_get_error_message(errornumber, buffer, sizeof(buffer));
dl_log_error(DL_LOG_ERR, p->log,
"PCRE2 compilation failed at offset %d: %s", (int)erroroffset, buffer);
return NULL;
}
}
match_data = pcre2_match_data_create_from_pattern(re, NULL);
total = 0; // the length of string after replacement
offset = 0;
option = 0;
while((rc = pcre2_match(re, s1, len, offset, option, match_data, NULL)) > 0){
ovector = pcre2_get_ovector_pointer(match_data);
str = dl_list_push(list);
str->data = s1 + offset;
str->len = ovector[0] - offset;
offset = ovector[1];
total += str->len + len_3;
}
if(rc == PCRE2_ERROR_NOMATCH){
str = dl_list_push(list);
str->data = s1 + offset;
str->len = len - offset;
total += str->len;
}else{
dl_log_error(DL_LOG_ERR, p->log, "pcre2 unknown error");
dl_destroy_pool(tmp_p);
pcre2_match_data_free(match_data);
if(rep == NULL) pcre2_code_free(re);
return NULL;
}
res_s->data = dl_palloc(p, total);
res_s->len = total;
cur = res_s->data;
for(part = &list->part; part; part = part->next){
str = part->elts;
cur = dl_cpymem(cur, str->data, str->len);
if(part != list->last){
cur = dl_cpymem(cur, s3, len_3);
}
}
pcre2_match_data_free(match_data);
dl_destroy_pool(tmp_p);
if(rep == NULL) pcre2_code_free(re);
return res_s;
}
/* match substring */
int
dl_str_match_re(char *s1, size_t len,
char *pattern, pcre2_code *rep, dl_log *log)
{
PCRE2_SIZE erroroffset;
PCRE2_SIZE *ovector;
int errornumber, rc, offset, option;
pcre2_match_data *match_data;
pcre2_code *re;
re = rep;
if(rep == NULL){
re = pcre2_compile(pattern, PCRE2_ZERO_TERMINATED, 0, &errornumber, &erroroffset, NULL);
if(re == NULL){
if(log){
PCRE2_UCHAR buffer[256];
pcre2_get_error_message(errornumber, buffer, sizeof(buffer));
dl_log_error(DL_LOG_ERR, log,
"PCRE2 compilation failed at offset %d: %s", (int)erroroffset, buffer);
}
return 0;
}
}
match_data = pcre2_match_data_create_from_pattern(re, NULL);
offset = 0;
option = 0;
rc = pcre2_match(re, s1, len, offset, option, match_data, NULL);
pcre2_match_data_free(match_data);
if(rep == NULL) pcre2_code_free(re);
if(rc > 0)
return rc;
else
return 0;
}
/*
match and capture
*/
dl_list *
dl_str_capture_re(dl_pool *p, char *s1, size_t len,
char *pattern, pcre2_code *rep, int all)
{
dl_str *str;
dl_list *list, **lt;
PCRE2_SIZE erroroffset;
PCRE2_SIZE *ovector;
int total, errornumber, rc, offset, option, i;
pcre2_match_data *match_data;
pcre2_code *re;
re = rep;
if(rep == NULL){
re = pcre2_compile(pattern, PCRE2_ZERO_TERMINATED, 0, &errornumber, &erroroffset, NULL);
if(re == NULL){
PCRE2_UCHAR buffer[256];
pcre2_get_error_message(errornumber, buffer, sizeof(buffer));
dl_log_error(DL_LOG_ERR, p->log,
"PCRE2 compilation failed at offset %d: %s", (int)erroroffset, buffer);
return NULL;
}
}
match_data = pcre2_match_data_create_from_pattern(re, NULL);
offset = 0;
option = 0;
if(all == DL_CAPTURE_ALL){
/* loop capture */
list = dl_list_create(p, 1, sizeof(void *));
if(list == NULL) return NULL;
while((rc = pcre2_match(re, s1, len, offset, option, match_data, NULL)) > 0){
ovector = pcre2_get_ovector_pointer(match_data);
lt = dl_list_push(list);
*lt = dl_list_create(p, 1, sizeof(dl_str));
for (i = 0; i < rc; i++){
str = dl_list_push(*lt);
str->data = s1 + ovector[2*i];
str->len = ovector[2*i+1] - ovector[2*i];
}
offset = ovector[1];
}
if(rc != PCRE2_ERROR_NOMATCH){
dl_log_error(DL_LOG_ERR, p->log, "pcre2 unknown error");
}
}else{
/* capture once */
list = dl_list_create(p, 1, sizeof(dl_str));
if(list == NULL) return NULL;
rc = pcre2_match(re, s1, len, offset, option, match_data, NULL);
if(rc > 0){
ovector = pcre2_get_ovector_pointer(match_data);
for (i = 0; i < rc; i++){
str = dl_list_push(list);
str->data = s1 + ovector[2*i];
str->len = ovector[2*i+1] - ovector[2*i];
//dl_printf("%d--%V\n", i, str);
}
}else{
if(rc != PCRE2_ERROR_NOMATCH){
dl_log_error(DL_LOG_ERR, p->log, "pcre2 unknown error");
}
}
}
pcre2_match_data_free(match_data);
if(rep == NULL) pcre2_code_free(re);
return list;
}