Method: Oj::Doc#each_child

Defined in:

ext/oj/fast.c

#each_child(path = nil) ⇒ Object

Yields to the provided block for each immediate child node with the identified location of the JSON document as the root. The parameter passed to the block on yield is the Doc instance after moving to the child location.

@param [String] path if provided it identified the top of the branch to

process the children of

Examples:

Oj::Doc.open('[3,[2,1]]') { |doc|
    result = []
    doc.each_value('/2') { |doc| result << doc.where? }
    result
}
#=> ["/2/1", "/2/2"]

Yield Parameters:

• Doc (Doc) —

  at the child location

# File 'ext/oj/fast.c', line 1461

static VALUE doc_each_child(int argc, VALUE *argv, VALUE self) {
    if (rb_block_given_p()) {
        Leaf        save_path[MAX_STACK];
        Doc         doc  = self_doc(self);
        const char *path = 0;
        size_t      wlen;
        Leaf       *where_orig = doc->where;

        wlen = doc->where - doc->where_path;
        if (0 < wlen) {
            memcpy(save_path, doc->where_path, sizeof(Leaf) * (wlen + 1));
        }
        if (1 <= argc) {
            path = StringValuePtr(*argv);
            if ('/' == *path) {
                doc->where = doc->where_path;
                path++;
            }
            if (0 != move_step(doc, path, 1)) {
                if (0 < wlen) {
                    memcpy(doc->where_path, save_path, sizeof(Leaf) * (wlen + 1));
                }
                doc->where = where_orig;
                return Qnil;
            }
        }
        if (NULL == doc->where || NULL == *doc->where) {
            return Qnil;
        }
        if (COL_VAL == (*doc->where)->value_type && 0 != (*doc->where)->elements) {
            Leaf first = (*doc->where)->elements->next;
            Leaf e     = first;

            doc->where++;
            do {
                *doc->where = e;
                rb_yield(self);
                e = e->next;
            } while (e != first);
        }
        if (0 < wlen) {
            memcpy(doc->where_path, save_path, sizeof(Leaf) * (wlen + 1));
        }
        doc->where = where_orig;
    }
    return Qnil;
}