Add the json parser

haversine_02/include/json/lexer.h

@@ -0,0 +1,72 @@
+#ifndef LEXER_STATES_H
+#define LEXER_STATES_H
+
+#include "aliases.h"
+#include <stdbool.h>
+
+#define VALID_JSON true
+#define INVALID_JSON false
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef const char *str_view_t;
+
+typedef enum {
+  TK_NO_TOKEN,
+  TK_L_BRACE,
+  TK_R_BRACE,
+  TK_L_BRACKET,
+  TK_R_BRACKET,
+  TK_NULL,
+  TK_BOOL,
+  TK_STR_KEY,
+  TK_STR_VAL,
+  TK_INTEGER,
+  TK_DOUBLE,
+} token_type;
+
+typedef union {
+  void *no_val;
+  i64 num_int;
+  f64 num_frac;
+  str_view_t string;
+  bool boolean;
+} token_value_t;
+
+typedef struct {
+  u64 line;
+  u64 column;
+  token_type type;
+  token_value_t value;
+} token_t;
+
+typedef enum {
+  LEX_ERR_NONE,
+  LEX_ERR_INVALID,
+} lex_err_type;
+
+typedef struct {
+  lex_err_type errno;
+  str_view_t msg;
+} lex_err_t;
+
+typedef struct {
+  lex_err_t error;
+  token_t token;
+} lex_result_t;
+
+typedef struct lexer_s lexer_t;
+
+void lexer_init(lexer_t **lexer);
+void lexer_free(lexer_t **lexer);
+lex_result_t get_next_token(lexer_t *lexer, const char *text);
+
+void print_token(token_t token);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // !LEXER_STATES_H