Added TOKEN_PP_USE to lexer with implementation

asm/lexer.c

@@ -24,6 +24,8 @@ const char *token_type_as_cstr(token_type_t type)
 {
   switch (type)
   {
+  case TOKEN_PP_USE:
+    return "PP_USE";
   case TOKEN_PP_CONST:
     return "PP_CONST";
   case TOKEN_PP_END:
@@ -180,6 +182,11 @@ lerr_t tokenise_symbol(buffer_t *buffer, size_t *column, token_t *token)
       type   = TOKEN_PP_CONST;
       offset = 6;
     }
+    else if (sym_size == 4 && strncmp(opcode + 1, "USE", 3) == 0)
+    {
+      type   = TOKEN_PP_USE;
+      offset = 4;
+    }
     else if (sym_size == 4 && strncmp(opcode + 1, "END", 3) == 0)
     {
       type   = TOKEN_PP_END;
@@ -599,8 +606,7 @@ lerr_t tokenise_buffer(buffer_t *buffer, token_stream_t *tokens_ptr)
       darr_append_bytes(&tokens, (byte *)&t, sizeof(t));
     }
   }
-  size_t n_tokens  = tokens.used / sizeof(token_t);
-  tokens.available = n_tokens;
+  tokens.available = tokens.used / sizeof(token_t);
   tokens.used      = 0;
   *tokens_ptr      = tokens;
   return LERR_OK;

asm/lexer.h

@@ -17,9 +17,10 @@
 
 typedef enum TokenType
 {
-  TOKEN_PP_CONST,
-  TOKEN_PP_END,
-  TOKEN_PP_REFERENCE,
+  TOKEN_PP_CONST,     // %const(<symbol>)...
+  TOKEN_PP_USE,       // %use <string>
+  TOKEN_PP_END,       // %end
+  TOKEN_PP_REFERENCE, // $<symbol>
   TOKEN_GLOBAL,
   TOKEN_STAR,
   TOKEN_LITERAL_NUMBER,