Support PHP 8.0's "Treat namespaced names as single token" change

[TysonAndre]

https://wiki.php.net/rfc/namespaced_names_as_token passed on July 31st. It makes the following changes to tokenization:

Foo\Bar;
// Before: T_STRING T_NS_SEPARATOR T_STRING
// After:  T_NAME_QUALIFIED
// Rule:   {LABEL}("\\"{LABEL})+
 
\Foo;
// Before: T_NS_SEPARATOR T_STRING
// After:  T_NAME_FULLY_QUALIFIED
// Rule:   ("\\"{LABEL})+
 
namespace\Foo;
// Before: T_NAMESPACE T_NS_SEPARATOR T_STRING
// After:  T_NAME_RELATIVE
// Rule:   "namespace"("\\"{LABEL})+

I think the simplest way to support existing applications might be to manually split up the T_NAME_* tokens into T_STRING, T_NAMESPACE, T_NS_SEPARATOR, etc after the call to token_get_all()

• Other new syntax like T_MATCH or T_FN can have the same thing done to emulate that. Switches are fast in newer php versions when all arguments are definitely integers.