fix: don't parse enums for PHP < 8

Author: czosel

src/lexer/tokens.js

@@ -33,6 +33,9 @@ module.exports = {
     }
 
     if (id === this.tok.T_ENUM) {
+      if (this.version < 801) {
+        return this.tok.T_STRING;
+      }
       const initial = this.offset;
       let ch = this.input();
       while (ch == " ") {

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

@@ -275,6 +275,8 @@ Program {
 }
 `;
 
+exports[`Test enums can't be parsed with PHP < 8 1`] = `"Parse Error : syntax error, unexpected 'Foo' (T_STRING), expecting ';' on line 1"`;
+
 exports[`Test enums cannot have properties 1`] = `"Parse Error : syntax error, unexpected 'int' (T_STRING) on line 3"`;
 
 exports[`Test enums doesn't cause problems when used as identifier 1`] = `

test/snapshot/enum.test.js

@@ -101,4 +101,10 @@ describe("Test enums", function () {
     `)
     ).toMatchSnapshot();
   });
+
+  it("can't be parsed with PHP < 8", function () {
+    expect(() => {
+      parser.parseEval("enum Foo {}", { parser: { version: "8.0" } });
+    }).toThrowErrorMatchingSnapshot();
+  });
 });