Swift: refactor ExprVisitor to use translations

Author: redsun82

swift/codegen/lib/cpp.py

@@ -16,7 +16,7 @@
                 "xor", "xor_eq"}
 
 _field_overrides = [
-    (re.compile(r"(start|end)_(line|column)|index|width|num_.*"), {"type": "unsigned"}),
+    (re.compile(r"(start|end)_(line|column)|(.*_)?index|width|num_.*"), {"type": "unsigned"}),
     (re.compile(r"(.*)_"), lambda m: {"field_name": m[1]}),
 ]