path: root/src/iterator.c

#include <stdlib.h>

#include "config.h"
#include "node.h"
#include "cmark.h"
#include "iterator.h"

cmark_iter*
cmark_iter_new(cmark_node *root)
{
    cmark_iter *iter = (cmark_iter*)malloc(sizeof(cmark_iter));
    if (iter == NULL) {
        return NULL;
    } else {
        iter->root = root;
        iter->current = root;
        iter->event_type = CMARK_EVENT_ENTER;
        return iter;
    }
}

void
cmark_iter_free(cmark_iter *iter)
{
    free(iter);
}

cmark_event_type
cmark_iter_next(cmark_iter *iter)
{
    return iter->event_type;
}

int S_is_leaf(cmark_node *node)
{
    switch (cmark_node_get_type(node)) {
    case CMARK_NODE_HTML:
    case CMARK_NODE_HRULE:
    case CMARK_NODE_CODE_BLOCK:
    case CMARK_NODE_TEXT:
    case CMARK_NODE_SOFTBREAK:
    case CMARK_NODE_LINEBREAK:
    case CMARK_NODE_CODE:
    case CMARK_NODE_INLINE_HTML:
        return 1;
    default:
        return 0;
    }
}

cmark_node*
cmark_iter_get_node(cmark_iter *iter)
{
    /* we'll return current */
    cmark_node *cur = iter->current;

    if (cur == NULL || iter->event_type == CMARK_EVENT_DONE) {
        return NULL;
    }

    /* roll forward to next item, setting both fields */
    if (iter->event_type == CMARK_EVENT_ENTER && !S_is_leaf(cur)) {
        if (cur->first_child == NULL) {
            /* stay on this node but exit */
            iter->event_type = CMARK_EVENT_EXIT;
        } else {
            iter->current = cur->first_child;
            iter->event_type = CMARK_EVENT_ENTER;
        }
    } else if (cur == iter->root) {
        /* don't move past root */
        iter->event_type = CMARK_EVENT_DONE;
        iter->current = NULL;
    } else if (cur->next) {
        iter->event_type = CMARK_EVENT_ENTER;
        iter->current = cur->next;
    } else if (cur->parent) {
        iter->event_type = CMARK_EVENT_EXIT;
        iter->current = cur->parent;
    } else {
        iter->event_type = CMARK_EVENT_DONE;
        iter->current = NULL;
    }

    return cur;
}