add evaluate_operand, fix operator tokenising

twasm/asm/tests.asm

@@ -40,6 +40,9 @@ run_tests:
   call clear_test_arena
   call test_identify_operator
 
+  call clear_test_arena
+  call test_evaluate_operand
+
   ret
   .msg db "running test suite...", 0x0A, 0x00
 
@@ -499,6 +502,52 @@ test_identify_operator:
     ret
   .msg db "test_identify_operator...", 0x00
 
+; ------------------------------------------------------------------------------
+; test_evaluate_operand
+;
+; description:
+; tests evaluate_operand described funtionality
+; ------------------------------------------------------------------------------
+
+test_evaluate_operand:
+  mov rsi, .msg
+  call print.test
+
+  mov rdi, .case0
+  mov rsi, 3
+  call evaluate_operand
+  cmp dl, 0x00
+  jne .fail
+  cmp ax, 0x0000
+  jne .fail
+
+  mov rdi, .case1
+  mov rsi, 0
+  call evaluate_operand
+  cmp dl, 0xFF
+  jne .fail
+
+  mov rdi, .case2
+  mov rsi, 3
+  call evaluate_operand
+  cmp dl, 0x00
+  jne .fail
+  cmp ax, 0x0003
+  jne .fail
+
+  .pass:
+    mov rsi, msg_pass
+    call print
+    ret
+  .fail:
+    mov rsi, msg_fail
+    call print
+    ret
+  .case0 db "rax"
+  .case1: ; intentionally blank
+  .case2 db "rdx"
+  .msg db "test_evaluate_operand...", 0x00
+
 msg_pass:
   db 0x0A
   times (TEST_LINE_LENGTH + .start - .end) db " ", ; right align