node: emit static ::class as class name string literal

fixtures/0011-magic-consts.php

@@ -17,7 +17,8 @@ function Foo() {
 class Bar {
 	function Baz() {
 		echo __CLASS__ . "::" . __METHOD__	;
-		echo Baz::class;
+		echo Bar::class;
+		// echo $this::class;
 	}
 }
 

node.go

@@ -1012,6 +1012,28 @@ func (this *conversionState) convertNoFreeFloating(n_ node.Node) (string, error)
 		constName := n.ConstantName.(*node.Identifier).Value
 		// TODO fix up visibility modifier
 
+		// Special case: `::class` is just the string name of the class
+		if constName == `class` {
+			// This can be known statically (e.g. MyClass::class --> "MyClass") but
+			// isn't generally known non-statically
+			if _, ok := n.Class.(*name.Name); ok {
+				// Static
+				return strconv.Quote(className), nil
+
+			} else if className == `self` {
+				return strconv.Quote(this.currentClassName), nil
+
+			} else {
+				// Dynamic
+				// Translate to reflect
+				// this.importPackages["reflect"] = struct{}{}
+				// return `reflect.TypeOf(` + className + `).String()`, nil
+
+				// Actually PHP doesn't support using ::class on variables
+				return "", parseErr{n, fmt.Errorf(`PHP Fatal error: Dynamic class names are not allowed in compile-time ::class fetch`)}
+			}
+		}
+
 		return className + constName, nil
 
 	case *expr.Exit: