started working on parser

src/collections/List.h

@@ -16,22 +16,27 @@
         return List_##T##_construct((T*)(len > 0 ? malloc(len * sizeof(T)) : NULL), 0, 0);\
     }\
     \
-    void List_##T##_push(List_##T* ptr, T value);
+    T* List_##T##_expand(List_##T* ptr);\
+    void List_##T##_push(List_##T* ptr, T value);\
 
 
 #define List_define(T)\
-    void List_##T##_push(List_##T* ptr, T value){\
-        u32 max_len = ptr->max_len;\
-        if(ptr->len == max_len){\
-            max_len = max_len * 1.5;\
+    T* List_##T##_expand(List_##T* ptr){\
+        if(ptr->len == ptr->max_len){\
+            u32 max_len = ptr->max_len * 1.5;\
             max_len += __List_padding_in_sizeof_T(T);\
             /* branchless version of max(max_len, __List_min_size) */\
             max_len += (max_len < __List_min_size) * (__List_min_size - max_len);\
             ptr->data = (T*)realloc(ptr->data, max_len * sizeof(T));\
             ptr->max_len = max_len;\
         }\
-        ptr->data[ptr->len++] = value;\
-    }
+        return &ptr->data[ptr->len++];\
+    }\
+    \
+    void List_##T##_push(List_##T* ptr, T value){\
+        T* empty_cell_ptr = List_##T##_expand(ptr);\
+        *empty_cell_ptr = value;\
+    }\
 
 #define __List_min_size 16