Refactor ALL the things!

src/parsers/epsilon.c

@@ -0,0 +1,20 @@
+#include "parser_internal.h"
+
+static HParseResult* parse_epsilon(void* env, HParseState* state) {
+  (void)env;
+  HParseResult* res = a_new(HParseResult, 1);
+  res->ast = NULL;
+  res->arena = state->arena;
+  return res;
+}
+
+static const HParserVtable epsilon_vt = {
+  .parse = parse_epsilon,
+};
+
+const HParser* h_epsilon_p() {
+  HParser *res = g_new(HParser, 1);
+  res->vtable = &epsilon_vt;
+  res->env = NULL;
+  return res;
+}