Didn't I just commit this?

src/parser/sss.c

+enum sss_type {
+  ATOM,
+  SEQUENCE,
+  CHOICE,
+  OPTION,
+  AT_LEAST_ZERO,
+  AT_LEAST_ONE,
+  AT_LEAST_N,
+  AT_MOST_N,
+  EXACTLY_N,
+  END
+};
+  
+
+typedef struct {
+  sss_type tag;
+  size_t (*matcher)(char *);
+} sss_component;
+
+typedef struct {
+  size_t length;
+  sss_component *body;
+} sss_pattern;
+