Refactor: macro constants -> config.h

include/config.h

@@ -0,0 +1,39 @@
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+
+/*
+    Number of elements in a hashmap
+
+    Hashmaps are implemented as an array
+    of linked lists. This specifies the
+    length of the initial array.
+*/
+#define OBJ_SIZE 32
+
+/*
+    Length of surrounding context to print
+    on parser errors.
+
+    Upon parser errors (e.g. syntax errors
+    in the JSON file), the program outputs
+    the surrounding context of the error.
+    E.g:
+       | Expected ':' at index 123
+       | context:
+       | \n\t\t{ "foo" "bar" },\n\t
+       |              ^
+    In the above example, ERROR_CONTEXT_LEN
+    is set to 20.
+*/
+#define ERROR_CONTEXT_LEN 60
+
+/*
+    Error codes
+    EARLY_EOF - End of file unexpectedly reached
+    UNEXPECTED_CHAR - Unexpected character encountered
+*/
+#define EARLY_EOF 202
+#define UNEXPECTED_CHAR 200
+
+#endif

include/json_value.h

@@ -2,10 +2,9 @@
 #ifndef _JSON_VALUE_H
 #define _JSON_VALUE_H
 
+#include "config.h"
 #include <stdbool.h> // bool
 
-#define OBJ_SIZE 32
-
 typedef struct obj_entry {
     char const* key;
     struct json_value* val;