Refactor ALL the things!

src/parsers/and.c

@@ -0,0 +1,22 @@
+#include "parser_internal.h"
+
+static HParseResult *parse_and(void* env, HParseState* state) {
+  HInputStream bak = state->input_stream;
+  HParseResult *res = h_do_parse((HParser*)env, state);
+  state->input_stream = bak;
+  if (res)
+    return make_result(state, NULL);
+  return NULL;
+}
+
+static const HParserVtable and_vt = {
+  .parse = parse_and,
+};
+
+const HParser* h_and(const HParser* p) {
+  // zero-width postive lookahead
+  HParser *res = g_new(HParser, 1);
+  res->env = (void*)p;
+  res->vtable = &and_vt;
+  return res;
+}