wip parser structure with placeholders

headers/parser.h

@@ -4,22 +4,37 @@
 #include "libft.h"
 #include "lexer.h"
 #include "errors.h"
+#include <stdbool.h>
 
 typedef enum
 {
     TERM_LEFT,  // a in "a = b"
     TERM_RIGHT, // b in "a = b"
-} term_type;
+} term_position;
+
+typedef enum
+{
+    TERM_PLUS,  // +
+    TERM_MINUS, // -
+} term_sign;
+
+typedef enum
+{
+    TYPE_INT,    // "123"
+    TYPE_DOUBLE, // "123.456"
+} coefficient_type;
 
 typedef struct
 {
-    term_type type;
+    term_position position;
+    term_sign sign;
+    coefficient_type coefficient_type;
     union
     {
-        char value_char;
-        int value_int;
-        double value_double;
+        int coefficient_int;
+        double coefficient_double;
     };
+    int exponent;
 } term;
 
 int parse(token *tokens, term *terms);