Woohoo we have math

src/basic.h

@@ -1,17 +1,20 @@
 #ifndef _BASIC_H_
 #define _BASIC_H_
 
-#define BASIC_MATH_ADD 1
-#define BASIC_MATH_SUB 2
-#define BASIC_MATH_MUL 3
-#define BASIC_MATH_DIV 4
-#define BASIC_MATH_MOD 5
+#define BASIC_OPTP_ADD 1
+#define BASIC_OPTP_SUB 2
+#define BASIC_OPTP_MUL 3
+#define BASIC_OPTP_DIV 4
+#define BASIC_OPTP_MOD 5
+#define BASIC_OPTP_EQL 6
+#define BASIC_OPTP_ASN 7
 
 #define BASIC_LVAL_EXPR  0
 #define BASIC_LVAL_VAR   1
-#define BASIC_RVAL_EXPR  2
-#define BASIC_RVAL_VAR   3
-#define BASIC_RVAL_CONST 4
+#define BASIC_LVAL_CONST 2
+#define BASIC_RVAL_EXPR  3
+#define BASIC_RVAL_VAR   4
+#define BASIC_RVAL_CONST 5
 
 #define BASIC_FOUND_LVAL 0x0001
 #define BASIC_FOUND_RVAL 0x0002
@@ -20,10 +23,17 @@
 #define BASIC_ERR_SYNTAX_TOKEN_LENGTH 2
 #define BASIC_ERR_SYNTAX_GENERAL 3
 #define BASIC_ERR_SYNTAX_MULTIPLE_RVALUES 4
+#define BASIC_ERR_INVALID_ARGUMENTS 5
+#define BASIC_ERR_INTERNAL_NULLPOINTER 6
+#define BASIC_ERR_INTERNAL_MEMORY 7
+#define BASIC_ERR_INTERNAL_UNDEFINED_BEHAVIOR 8
+#define BASIC_ERR_INTERNAL_UNIMPLEMENTED 9
+#define BASIC_ERR_MATH_DBZ 10
 
 #define BASIC_TOKENIZER_MAX_LENGTH 512
+#define BASIC_VARNAME_MAX_LENGTH 16
 
-struct basic_math_expr {
+struct basic_expr {
   char type;
   char lval_type;
   char rval_type;
@@ -32,6 +42,19 @@ struct basic_math_expr {
   void *rval;
 };
 
+#define BASIC_VARFLAG_INIT 1
+#define BASIC_VARFLAG_TINT 2
+#define BASIC_VARFLAG_TSTR 4
+
+struct basic_variable {
+  char *name;
+  char flags;
+  void *value;
+};
+
+#define BASIC_CONST_TRUE 1
+#define BASIC_CONST_FALSE 0
+
 extern int basic_errno;
 
 void run_basic(void);