fix: handle enum followed by implements/extends

Author: czosel

src/lexer/tokens.js

@@ -32,6 +32,7 @@ module.exports = {
       }
     }
 
+    // https://github.com/php/php-src/blob/master/Zend/zend_language_scanner.l#L1546
     if (id === this.tok.T_ENUM) {
       if (this.version < 801) {
         return this.tok.T_STRING;
@@ -41,10 +42,16 @@ module.exports = {
       while (ch == " ") {
         ch = this.input();
       }
+      let isEnum = false;
+      if (this.is_LABEL_START()) {
+        while (this.is_LABEL()) {
+          ch += this.input();
+        }
+        isEnum = !ch.startsWith("extends") && !ch.startsWith("implements");
+      }
 
-      const is_enum = this.is_LABEL_START();
       this.unput(this.offset - initial);
-      return is_enum ? this.tok.T_ENUM : this.tok.T_STRING;
+      return isEnum ? this.tok.T_ENUM : this.tok.T_STRING;
     }
 
     if (this.offset < this.size && id !== this.tok.T_YIELD_FROM) {

test/snapshot/__snapshots__/enum.test.js.snap

@@ -351,6 +351,44 @@ Program {
       "nullable": false,
       "type": null,
     },
+    Class {
+      "attrGroups": Array [],
+      "body": Array [],
+      "extends": Name {
+        "kind": "name",
+        "name": "Foo",
+        "resolution": "uqn",
+      },
+      "implements": null,
+      "isAbstract": false,
+      "isAnonymous": false,
+      "isFinal": false,
+      "kind": "class",
+      "name": Identifier {
+        "kind": "identifier",
+        "name": "Enum",
+      },
+    },
+    Class {
+      "attrGroups": Array [],
+      "body": Array [],
+      "extends": null,
+      "implements": Array [
+        Name {
+          "kind": "name",
+          "name": "Foo",
+          "resolution": "uqn",
+        },
+      ],
+      "isAbstract": false,
+      "isAnonymous": false,
+      "isFinal": false,
+      "kind": "class",
+      "name": Identifier {
+        "kind": "identifier",
+        "name": "Enum",
+      },
+    },
   ],
   "errors": Array [],
   "kind": "program",

test/snapshot/enum.test.js

@@ -98,6 +98,8 @@ describe("Test enums", function () {
       interface Enum {}
       trait Enum  {}
       function enum() {}
+      class Enum extends Foo {}
+      class Enum implements Foo {}
     `)
     ).toMatchSnapshot();
   });