diff --git a/compiler.h b/compiler.h
index a6320d8..7b29baf 100644
--- a/compiler.h
+++ b/compiler.h
@@ -1,6 +1,48 @@
 #ifndef ROSEBUDCOMPILER_H
 #define ROSEBUDCOMPILER_H
 #include <stdio.h>
+#include <stdbool.h>
+
+struct pos
+{
+    int line;
+    int col;
+    const char *filename;
+};
+
+enum
+{
+    TOKEN_TYPE_IDENTIFIER,
+    TOKEN_TYPE_KEYWORD,
+    TOKEN_TYPE_OPERATOR,
+    TOKEN_TYPE_SYMBOL,
+    TOKEN_TYPE_NUMBER,
+    TOKEN_TYPE_STRING,
+    TOKEN_TYPE_COMMENT,
+    TOKEN_TYPE_NEWLINE,
+};
+
+struct tokent
+{
+    int type;
+    int flags;
+
+    union
+    {
+        char cval;
+        const char *sval;
+        unsigned int inum;
+        unsigned long lnum;
+        unsigned long long llnum;
+        void *any;
+    };
+
+    // True if there is a whitespace between the current token and next token
+    bool whitespace;
+
+    // (5+10+20)
+    const char *between_brackets;
+};
 
 enum
 {