Backup, new approach to ast

common.c

@@ -5,6 +5,12 @@ clamp_top_s64(S64 val, S64 max){
   return val;
 }
 
+function SizeU
+clamp_top_sizeu(SizeU val, SizeU max){
+  if(val>max)return max;
+  return val;
+}
+
 function SizeU
 get_align_offset(SizeU size, SizeU align){
   SizeU mask = align - 1;
@@ -55,3 +61,26 @@ string_compare(String a, String b){
   }
   return true;
 }
+
+function U8
+char_to_lower(U8 c){
+  if(c >= 'A' && c <= 'Z')
+    c += 32;
+  return c;
+}
+
+function U8
+char_to_upper(U8 c){
+  if(c >= 'a' && c <= 'z')
+    c -= 32;
+  return c;
+}
+
+function String
+string_to_lower(Arena *arena, String string){
+  String result = arena_push_string_copy(arena, string);
+  for(S64 i = 0; i < string.len; i++){
+    result.str[i] = char_to_lower(result.str[i]);
+  }
+  return result;
+}