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#include <assert.h>
#include <stdlib.h>
#include "config.h"
#include "node.h"
#include "cmark.h"
#include "iterator.h"
static const int S_leaf_mask =
(1 << CMARK_NODE_HTML) |
(1 << CMARK_NODE_HRULE) |
(1 << CMARK_NODE_CODE_BLOCK) |
(1 << CMARK_NODE_TEXT) |
(1 << CMARK_NODE_SOFTBREAK) |
(1 << CMARK_NODE_LINEBREAK) |
(1 << CMARK_NODE_CODE) |
(1 << CMARK_NODE_INLINE_HTML);
cmark_iter*
cmark_iter_new(cmark_node *root)
{
if (root == NULL) {
return NULL;
}
cmark_iter *iter = (cmark_iter*)malloc(sizeof(cmark_iter));
if (iter == NULL) {
return NULL;
}
iter->root = root;
iter->cur.ev_type = CMARK_EVENT_NONE;
iter->cur.node = NULL;
iter->next.ev_type = CMARK_EVENT_ENTER;
iter->next.node = root;
return iter;
}
void
cmark_iter_free(cmark_iter *iter)
{
free(iter);
}
static bool
S_is_leaf(cmark_node *node)
{
return (1 << node->type) & S_leaf_mask;
}
cmark_event_type
cmark_iter_next(cmark_iter *iter)
{
cmark_event_type ev_type = iter->next.ev_type;
cmark_node *node = iter->next.node;
iter->cur.ev_type = ev_type;
iter->cur.node = node;
if (ev_type == CMARK_EVENT_DONE) {
return ev_type;
}
/* roll forward to next item, setting both fields */
if (ev_type == CMARK_EVENT_ENTER && !S_is_leaf(node)) {
if (node->first_child == NULL) {
/* stay on this node but exit */
iter->next.ev_type = CMARK_EVENT_EXIT;
} else {
iter->next.ev_type = CMARK_EVENT_ENTER;
iter->next.node = node->first_child;
}
} else if (node == iter->root) {
/* don't move past root */
iter->next.ev_type = CMARK_EVENT_DONE;
iter->next.node = NULL;
} else if (node->next) {
iter->next.ev_type = CMARK_EVENT_ENTER;
iter->next.node = node->next;
} else if (node->parent) {
iter->next.ev_type = CMARK_EVENT_EXIT;
iter->next.node = node->parent;
} else {
assert(false);
iter->next.ev_type = CMARK_EVENT_DONE;
iter->next.node = NULL;
}
return ev_type;
}
void
cmark_iter_reset(cmark_iter *iter, cmark_node *current,
cmark_event_type event_type)
{
iter->next.ev_type = event_type;
iter->next.node = current;
cmark_iter_next(iter);
}
cmark_node*
cmark_iter_get_node(cmark_iter *iter)
{
return iter->cur.node;
}
cmark_event_type
cmark_iter_get_event_type(cmark_iter *iter)
{
return iter->cur.ev_type;
}
void cmark_consolidate_text_nodes(cmark_node *root)
{
cmark_iter *iter = cmark_iter_new(root);
cmark_strbuf buf = GH_BUF_INIT;
cmark_event_type ev_type;
cmark_node *cur, *tmp, *next;
while ((ev_type = cmark_iter_next(iter)) != CMARK_EVENT_DONE) {
cur = cmark_iter_get_node(iter);
if (ev_type == CMARK_EVENT_ENTER &&
cur->type == CMARK_NODE_TEXT &&
cur->next &&
cur->next->type == CMARK_NODE_TEXT) {
cmark_strbuf_clear(&buf);
cmark_strbuf_puts(&buf, cmark_node_get_literal(cur));
tmp = cur->next;
while (tmp && tmp->type == CMARK_NODE_TEXT) {
cmark_iter_get_node(iter); // advance pointer
cmark_strbuf_puts(&buf, cmark_node_get_literal(tmp));
next = tmp->next;
cmark_node_free(tmp);
tmp = next;
}
cmark_node_set_literal(cur, (char *)cmark_strbuf_detach(&buf));
}
}
cmark_iter_free(iter);
}
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