Refactor classes representing individual characters & character classes

src/compiler/rules/character.h

@@ -0,0 +1,23 @@
+#ifndef __tree_sitter__char__
+#define __tree_sitter__char__
+
+#include "rule.h"
+#include "char_match.h"
+
+namespace tree_sitter  {
+    namespace rules {
+        class Character : public Rule {
+        public:
+            Character(char character);
+            Character(CharClass character_class);
+            Character(char min_character, char max_character);
+            bool operator==(const Rule& other) const;
+            std::string to_string() const;
+            void accept(Visitor &visitor) const;
+
+            const CharMatch value;
+        };
+    }
+}
+
+#endif