Add interface clause

Author: dantleech

src/Parser.php

@@ -18,6 +18,7 @@
 use Microsoft\PhpParser\Node\ClassMembersNode;
 use Microsoft\PhpParser\Node\ConstElement;
 use Microsoft\PhpParser\Node\EnumCaseDeclaration;
+use Microsoft\PhpParser\Node\EnumInterfaceClause;
 use Microsoft\PhpParser\Node\EnumMembers;
 use Microsoft\PhpParser\Node\Expression;
 use Microsoft\PhpParser\Node\Expression\{
@@ -3723,11 +3724,27 @@ private function parseEnumDeclaration($parentNode) {
                 ?: new MissingToken(TokenKind::EnumType, $this->token->fullStart);
         }
 
+        $enumDeclaration->enumInterfaceClause = $this->parseEnumInterfaceClause($enumDeclaration);
         $enumDeclaration->enumMembers = $this->parseEnumMembers($enumDeclaration);
 
         return $enumDeclaration;
     }
 
+    private function parseEnumInterfaceClause(EnumDeclaration $enumDeclaration): ?EnumInterfaceClause {
+        $enumInterfaceClause = new EnumInterfaceClause();
+        $enumInterfaceClause->parent = $enumDeclaration;
+        $enumInterfaceClause->implementsKeyword = $this->eatOptional1(TokenKind::ImplementsKeyword);
+
+        if ($enumInterfaceClause->implementsKeyword === null) {
+            return null;
+        }
+
+        $enumInterfaceClause->interfaceNameList =
+            $this->parseQualifiedNameList($enumInterfaceClause);
+        return $enumInterfaceClause;
+    }
+
+
     private function parseEnumMembers($parentNode) {
         $enumMembers = new EnumMembers();
         $enumMembers->parent = $parentNode;

tests/cases/parser81/enums1.php.tree

@@ -24,6 +24,7 @@
                     },
                     "colonToken": null,
                     "enumType": null,
+                    "enumInterfaceClause": null,
                     "enumMembers": {
                         "EnumMembers": {
                             "openBrace": {

tests/cases/parser81/enums2.php.tree

@@ -30,6 +30,7 @@
                         "kind": "IntReservedWord",
                         "textLength": 3
                     },
+                    "enumInterfaceClause": null,
                     "enumMembers": {
                         "EnumMembers": {
                             "openBrace": {

tests/cases/parser81/enums3.php.tree

@@ -62,6 +62,7 @@
                     },
                     "colonToken": null,
                     "enumType": null,
+                    "enumInterfaceClause": null,
                     "enumMembers": {
                         "EnumMembers": {
                             "openBrace": {

tests/cases/parser81/enums4.php.tree

@@ -30,6 +30,7 @@
                         "kind": "StringReservedWord",
                         "textLength": 6
                     },
+                    "enumInterfaceClause": null,
                     "enumMembers": {
                         "EnumMembers": {
                             "openBrace": {

tests/cases/parser81/enums5.php.tree

@@ -31,6 +31,7 @@
                         "kind": "EnumType",
                         "textLength": 0
                     },
+                    "enumInterfaceClause": null,
                     "enumMembers": {
                         "EnumMembers": {
                             "openBrace": {

tests/cases/parser81/enums6.php.tree

@@ -30,6 +30,7 @@
                         "kind": "IntReservedWord",
                         "textLength": 3
                     },
+                    "enumInterfaceClause": null,
                     "enumMembers": {
                         "EnumMembers": {
                             "openBrace": {