-#define exit_if_null(pointer, ...) { if (pointer == NULL) die(__VA_ARGS__); }
-#define STARTS_WITH(string, needle) (strncasecmp(string, needle, strlen(needle)) == 0)
-#define CIRCLEQ_NEXT_OR_NULL(head, elm, field) (CIRCLEQ_NEXT(elm, field) != CIRCLEQ_END(head) ? \
- CIRCLEQ_NEXT(elm, field) : NULL)
-#define CIRCLEQ_PREV_OR_NULL(head, elm, field) (CIRCLEQ_PREV(elm, field) != CIRCLEQ_END(head) ? \
- CIRCLEQ_PREV(elm, field) : NULL)
-#define FOR_TABLE(workspace) \
- for (int cols = 0; cols < (workspace)->cols; cols++) \
- for (int rows = 0; rows < (workspace)->rows; rows++)
-#define FREE(pointer) do { \
- if (pointer != NULL) { \
- free(pointer); \
- pointer = NULL; \
- } \
-} \
-while (0)
+#define exit_if_null(pointer, ...) \
+ { \
+ if (pointer == NULL) \
+ die(__VA_ARGS__); \
+ }
+#define STARTS_WITH(string, needle) (strncasecmp((string), (needle), strlen((needle))) == 0)
+#define CIRCLEQ_NEXT_OR_NULL(head, elm, field) (CIRCLEQ_NEXT(elm, field) != CIRCLEQ_END(head) ? CIRCLEQ_NEXT(elm, field) : NULL)
+#define CIRCLEQ_PREV_OR_NULL(head, elm, field) (CIRCLEQ_PREV(elm, field) != CIRCLEQ_END(head) ? CIRCLEQ_PREV(elm, field) : NULL)
+
+#define NODES_FOREACH(head) \
+ for (Con *child = (Con *)-1; (child == (Con *)-1) && ((child = 0), true);) \
+ TAILQ_FOREACH(child, &((head)->nodes_head), nodes)
+
+#define NODES_FOREACH_REVERSE(head) \
+ for (Con *child = (Con *)-1; (child == (Con *)-1) && ((child = 0), true);) \
+ TAILQ_FOREACH_REVERSE(child, &((head)->nodes_head), nodes_head, nodes)
+
+/* greps the ->nodes of the given head and returns the first node that matches the given condition */
+#define GREP_FIRST(dest, head, condition) \
+ NODES_FOREACH(head) { \
+ if (!(condition)) \
+ continue; \
+ \
+ (dest) = child; \
+ break; \
+ }
+
+#define FREE(pointer) \
+ do { \
+ free(pointer); \
+ pointer = NULL; \
+ } while (0)
+
+#define CALL(obj, member, ...) obj->member(obj, ##__VA_ARGS__)
+
+#define SWAP(first, second, type) \
+ do { \
+ type tmp_SWAP = first; \
+ first = second; \
+ second = tmp_SWAP; \
+ } while (0)