split files

headers/lexer.h

@@ -0,0 +1,31 @@
+#ifndef LEXER_H
+#define LEXER_H
+
+#include "../libft/includes/libft.h"
+
+typedef enum
+{
+    TOKEN_PLUS,           // +
+    TOKEN_MINUS,          // -
+    TOKEN_VARIABLE,       // x, y, etc.
+    TOKEN_NUMBER,         // int or double
+    TOKEN_POWER,          // ^ or **
+    TOKEN_MULTIPLICATION, // *
+    TOKEN_DIVISION,       // /
+    TOKEN_END             // null (end of input)
+} token_type;
+
+typedef struct
+{
+    token_type type;
+    union
+    {
+        double num_value; // For NUMBER
+        char var_value;   // For VARIABLE (single char, e.g., 'x')
+    };
+} token;
+
+#define MAX_TOKENS 100
+int lexerize(const char *input, token tokens[MAX_TOKENS]);
+
+#endif