Refactor ALL the things!

src/parsers/attr_bool.c

@@ -0,0 +1,32 @@
+#include "parser_internal.h"
+
+typedef struct {
+  const HParser *p;
+  HPredicate pred;
+} HAttrBool;
+
+static HParseResult* parse_attr_bool(void *env, HParseState *state) {
+  HAttrBool *a = (HAttrBool*)env;
+  HParseResult *res = h_do_parse(a->p, state);
+  if (res && res->ast) {
+    if (a->pred(res))
+      return res;
+    else
+      return NULL;
+  } else
+    return NULL;
+}
+
+static const HParserVtable attr_bool_vt = {
+  .parse = parse_attr_bool,
+};
+
+const HParser* h_attr_bool(const HParser* p, HPredicate pred) { 
+  HParser *res = g_new(HParser, 1);
+  res->vtable = &attr_bool_vt;
+  HAttrBool *env = g_new(HAttrBool, 1);
+  env->p = p;
+  env->pred = pred;
+  res->env = (void*)env;
+  return res;
+}