Add the json parser

haversine_02/include/json/json_entities.h

@@ -0,0 +1,82 @@
+#ifndef JSON_ENTITIES_H
+#define JSON_ENTITIES_H
+
+#include "aliases.h"
+#include "dstring.h"
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct json_entity jentity_t;
+typedef struct json_collection jcoll_t;
+typedef struct json_value jval_t;
+typedef struct json_pair jpair_t;
+
+typedef enum {
+  JVAL_EMPTY,
+  JVAL_COLLECTION,
+  JVAL_STRING,
+  JVAL_INTEGER,
+  JVAL_DOUBLE,
+  JVAL_BOOLEAN,
+  JVAL_NULL,
+} jval_type;
+
+struct json_value {
+  jval_type type;
+  union {
+    void *null_val;
+    jcoll_t *collection;
+    dstr_t *string;
+    i64 num_int;
+    f64 num_dbl;
+    bool boolean;
+  };
+};
+
+struct json_pair {
+  dstr_t *key;
+  jval_t value;
+};
+
+typedef enum {
+  JENTITY_SINGLE,
+  JENTITY_PAIR,
+} jentity_type;
+
+struct json_entity {
+  jentity_type type;
+  union {
+    jval_t value;
+    jpair_t pair;
+  };
+  jentity_t *parent;
+  jentity_t *next;
+};
+
+typedef enum {
+  JCOLL_OBJECT,
+  JCOLL_ARRAY,
+} jcoll_type;
+
+struct json_collection {
+  u64 size;
+  jcoll_type type;
+  jentity_t *begin;
+  jentity_t *end;
+};
+
+void print_json(const jentity_t *entity, u32 indent);
+void free_json(jentity_t **entity);
+jcoll_t *get_collection_from_entity(const jentity_t *entity);
+jentity_t *create_new_single_entity(const jval_t value, jentity_t *parent);
+jentity_t *create_new_pair_entity(dstr_t *key, const jval_t value,
+                                  jentity_t *parent);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // !JSON_ENTITIES_H