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#include "cmark.h"
#include "utf8.h"
#include "parser.h"
#include "references.h"
#include "inlines.h"
#include "chunk.h"
static void reference_free(cmark_reference_map *map, cmark_reference *ref) {
cmark_mem *mem = map->mem;
if (ref != NULL) {
mem->free(ref->label);
mem->free(ref->url);
mem->free(ref->title);
mem->free(ref);
}
}
// normalize reference: collapse internal whitespace to single space,
// remove leading/trailing whitespace, case fold
// Return NULL if the reference name is actually empty (i.e. composed
// solely from whitespace)
static unsigned char *normalize_reference(cmark_mem *mem, cmark_chunk *ref) {
cmark_strbuf normalized = CMARK_BUF_INIT(mem);
unsigned char *result;
if (ref == NULL)
return NULL;
if (ref->len == 0)
return NULL;
cmark_utf8proc_case_fold(&normalized, ref->data, ref->len);
cmark_strbuf_trim(&normalized);
cmark_strbuf_normalize_whitespace(&normalized);
result = cmark_strbuf_detach(&normalized);
assert(result);
if (result[0] == '\0') {
mem->free(result);
return NULL;
}
return result;
}
void cmark_reference_create(cmark_reference_map *map, cmark_chunk *label,
cmark_chunk *url, cmark_chunk *title) {
cmark_reference *ref;
unsigned char *reflabel = normalize_reference(map->mem, label);
/* empty reference name, or composed from only whitespace */
if (reflabel == NULL)
return;
assert(map->sorted == NULL);
ref = (cmark_reference *)map->mem->calloc(1, sizeof(*ref));
ref->label = reflabel;
ref->url = cmark_clean_url(map->mem, url);
ref->title = cmark_clean_title(map->mem, title);
ref->age = map->size;
ref->next = map->refs;
map->refs = ref;
map->size++;
}
static int
labelcmp(const unsigned char *a, const unsigned char *b) {
return strcmp((const char *)a, (const char *)b);
}
static int
refcmp(const void *p1, const void *p2) {
cmark_reference *r1 = *(cmark_reference **)p1;
cmark_reference *r2 = *(cmark_reference **)p2;
int res = labelcmp(r1->label, r2->label);
return res ? res : ((int)r1->age - (int)r2->age);
}
static int
refsearch(const void *label, const void *p2) {
cmark_reference *ref = *(cmark_reference **)p2;
return labelcmp(label, ref->label);
}
static void sort_references(cmark_reference_map *map) {
unsigned int i = 0, last = 0, size = map->size;
cmark_reference *r = map->refs, **sorted = NULL;
sorted = map->mem->calloc(size, sizeof(cmark_reference *));
while (r) {
sorted[i++] = r;
r = r->next;
}
qsort(sorted, size, sizeof(cmark_reference *), refcmp);
for (i = 1; i < size; i++) {
if (labelcmp(sorted[i]->label, sorted[last]->label) != 0)
sorted[++last] = sorted[i];
}
map->sorted = sorted;
map->size = last + 1;
}
// Returns reference if refmap contains a reference with matching
// label, otherwise NULL.
cmark_reference *cmark_reference_lookup(cmark_reference_map *map,
cmark_chunk *label) {
cmark_reference **ref = NULL;
unsigned char *norm;
if (label->len < 1 || label->len > MAX_LINK_LABEL_LENGTH)
return NULL;
if (map == NULL || !map->size)
return NULL;
norm = normalize_reference(map->mem, label);
if (norm == NULL)
return NULL;
if (!map->sorted)
sort_references(map);
ref = bsearch(norm, map->sorted, map->size, sizeof(cmark_reference *),
refsearch);
map->mem->free(norm);
return ref ? ref[0] : NULL;
}
void cmark_reference_map_free(cmark_reference_map *map) {
cmark_reference *ref;
if (map == NULL)
return;
ref = map->refs;
while (ref) {
cmark_reference *next = ref->next;
reference_free(map, ref);
ref = next;
}
map->mem->free(map->sorted);
map->mem->free(map);
}
cmark_reference_map *cmark_reference_map_new(cmark_mem *mem) {
cmark_reference_map *map =
(cmark_reference_map *)mem->calloc(1, sizeof(cmark_reference_map));
map->mem = mem;
return map;
}
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