No support for namespace operator used in type declarations

package.xml

@@ -114,6 +114,8 @@ http://pear.php.net/dtd/package-2.0.xsd">
       <file baseinstalldir="" name="BackfillNumericSeparatorTest.php" role="test" />
       <file baseinstalldir="" name="NullsafeObjectOperatorTest.inc" role="test" />
       <file baseinstalldir="" name="NullsafeObjectOperatorTest.php" role="test" />
+      <file baseinstalldir="" name="ScopeSettingWithNamespaceOperatorTest.inc" role="test" />
+      <file baseinstalldir="" name="ScopeSettingWithNamespaceOperatorTest.php" role="test" />
       <file baseinstalldir="" name="ShortArrayTest.inc" role="test" />
       <file baseinstalldir="" name="ShortArrayTest.php" role="test" />
       <file baseinstalldir="" name="StableCommentWhitespaceTest.inc" role="test" />
@@ -1986,6 +1988,8 @@ http://pear.php.net/dtd/package-2.0.xsd">
    <install as="CodeSniffer/Core/Tokenizer/BackfillNumericSeparatorTest.inc" name="tests/Core/Tokenizer/BackfillNumericSeparatorTest.inc" />
    <install as="CodeSniffer/Core/Tokenizer/NullsafeObjectOperatorTest.php" name="tests/Core/Tokenizer/NullsafeObjectOperatorTest.php" />
    <install as="CodeSniffer/Core/Tokenizer/NullsafeObjectOperatorTest.inc" name="tests/Core/Tokenizer/NullsafeObjectOperatorTest.inc" />
+   <install as="CodeSniffer/Core/Tokenizer/ScopeSettingWithNamespaceOperatorTest.php" name="tests/Core/Tokenizer/ScopeSettingWithNamespaceOperatorTest.php" />
+   <install as="CodeSniffer/Core/Tokenizer/ScopeSettingWithNamespaceOperatorTest.inc" name="tests/Core/Tokenizer/ScopeSettingWithNamespaceOperatorTest.inc" />
    <install as="CodeSniffer/Core/Tokenizer/ShortArrayTest.php" name="tests/Core/Tokenizer/ShortArrayTest.php" />
    <install as="CodeSniffer/Core/Tokenizer/ShortArrayTest.inc" name="tests/Core/Tokenizer/ShortArrayTest.inc" />
    <install as="CodeSniffer/Core/Tokenizer/StableCommentWhitespaceTest.php" name="tests/Core/Tokenizer/StableCommentWhitespaceTest.php" />
@@ -2047,6 +2051,8 @@ http://pear.php.net/dtd/package-2.0.xsd">
    <install as="CodeSniffer/Core/Tokenizer/BackfillNumericSeparatorTest.inc" name="tests/Core/Tokenizer/BackfillNumericSeparatorTest.inc" />
    <install as="CodeSniffer/Core/Tokenizer/NullsafeObjectOperatorTest.php" name="tests/Core/Tokenizer/NullsafeObjectOperatorTest.php" />
    <install as="CodeSniffer/Core/Tokenizer/NullsafeObjectOperatorTest.inc" name="tests/Core/Tokenizer/NullsafeObjectOperatorTest.inc" />
+   <install as="CodeSniffer/Core/Tokenizer/ScopeSettingWithNamespaceOperatorTest.php" name="tests/Core/Tokenizer/ScopeSettingWithNamespaceOperatorTest.php" />
+   <install as="CodeSniffer/Core/Tokenizer/ScopeSettingWithNamespaceOperatorTest.inc" name="tests/Core/Tokenizer/ScopeSettingWithNamespaceOperatorTest.inc" />
    <install as="CodeSniffer/Core/Tokenizer/ShortArrayTest.php" name="tests/Core/Tokenizer/ShortArrayTest.php" />
    <install as="CodeSniffer/Core/Tokenizer/ShortArrayTest.inc" name="tests/Core/Tokenizer/ShortArrayTest.inc" />
    <install as="CodeSniffer/Core/Tokenizer/StableCommentWhitespaceTest.php" name="tests/Core/Tokenizer/StableCommentWhitespaceTest.php" />

src/Files/File.php

@@ -1441,6 +1441,7 @@ public function getMethodParameters($stackPtr)
                     $typeHintEndToken = $i;
                 }
                 break;
+            case T_NAMESPACE:
             case T_NS_SEPARATOR:
                 // Part of a type hint or default value.
                 if ($defaultStart === null) {
@@ -1630,6 +1631,7 @@ public function getMethodProperties($stackPtr)
                 T_SELF         => T_SELF,
                 T_PARENT       => T_PARENT,
                 T_STATIC       => T_STATIC,
+                T_NAMESPACE    => T_NAMESPACE,
                 T_NS_SEPARATOR => T_NS_SEPARATOR,
             ];
 
@@ -1813,6 +1815,7 @@ public function getMemberProperties($stackPtr)
                 T_CALLABLE     => T_CALLABLE,
                 T_SELF         => T_SELF,
                 T_PARENT       => T_PARENT,
+                T_NAMESPACE    => T_NAMESPACE,
                 T_NS_SEPARATOR => T_NS_SEPARATOR,
             ];
 

src/Tokenizers/PHP.php

@@ -1149,6 +1149,7 @@ protected function tokenize($string)
 
                     if ($tokenType === T_STRING
                         || $tokenType === T_ARRAY
+                        || $tokenType === T_NAMESPACE
                         || $tokenType === T_NS_SEPARATOR
                     ) {
                         $lastRelevantNonEmpty = $tokenType;
@@ -1382,6 +1383,7 @@ function return types. We want to keep the parenthesis map clean,
                             T_CALLABLE     => T_CALLABLE,
                             T_SELF         => T_SELF,
                             T_PARENT       => T_PARENT,
+                            T_NAMESPACE    => T_NAMESPACE,
                             T_NS_SEPARATOR => T_NS_SEPARATOR,
                         ];
 
@@ -1896,6 +1898,7 @@ protected function processAdditional()
                         T_STRING       => T_STRING,
                         T_ARRAY        => T_ARRAY,
                         T_COLON        => T_COLON,
+                        T_NAMESPACE    => T_NAMESPACE,
                         T_NS_SEPARATOR => T_NS_SEPARATOR,
                         T_NULLABLE     => T_NULLABLE,
                         T_CALLABLE     => T_CALLABLE,

src/Tokenizers/Tokenizer.php

@@ -1111,6 +1111,13 @@ private function recurseScopeMap($stackPtr, $depth=1, &$ignore=0)
                         continue;
                     }
 
+                    if ($tokenType === T_NAMESPACE) {
+                        // PHP namespace keywords are special because they can be
+                        // used as blocks but also inline as operators.
+                        // So if we find them nested inside another opener, just skip them.
+                        continue;
+                    }
+
                     if ($tokenType === T_FUNCTION
                         && $this->tokens[$stackPtr]['code'] !== T_FUNCTION
                     ) {

tests/Core/File/GetMemberPropertiesTest.inc

@@ -188,3 +188,8 @@ class PHP8Mixed {
     // Intentional fatal error - nullability is not allowed with mixed, but that's not the concern of the method.
     private ?mixed $nullableMixed;
 }
+
+class NSOperatorInType {
+    /* testNamespaceOperatorTypeHint */
+    public ?namespace\Name $prop;
+}

tests/Core/File/GetMemberPropertiesTest.php

@@ -479,6 +479,16 @@ public function dataGetMemberProperties()
                     'nullable_type'   => true,
                 ],
             ],
+            [
+                '/* testNamespaceOperatorTypeHint */',
+                [
+                    'scope'           => 'public',
+                    'scope_specified' => true,
+                    'is_static'       => false,
+                    'type'            => '?namespace\Name',
+                    'nullable_type'   => true,
+                ],
+            ],
         ];
 
     }//end dataGetMemberProperties()

tests/Core/File/GetMethodParametersTest.inc

@@ -38,3 +38,6 @@ function mixedTypeHint(mixed &...$var1) {}
 /* testPHP8MixedTypeHintNullable */
 // Intentional fatal error - nullability is not allowed with mixed, but that's not the concern of the method.
 function mixedTypeHintNullable(?Mixed $var1) {}
+
+/* testNamespaceOperatorTypeHint */
+function namespaceOperatorTypeHint(?namespace\Name $var1) {}

tests/Core/File/GetMethodParametersTest.php

@@ -318,6 +318,28 @@ public function testPHP8MixedTypeHintNullable()
     }//end testPHP8MixedTypeHintNullable()
 
 
+    /**
+     * Verify recognition of type declarations using the namespace operator.
+     *
+     * @return void
+     */
+    public function testNamespaceOperatorTypeHint()
+    {
+        $expected    = [];
+        $expected[0] = [
+            'name'              => '$var1',
+            'content'           => '?namespace\Name $var1',
+            'pass_by_reference' => false,
+            'variable_length'   => false,
+            'type_hint'         => '?namespace\Name',
+            'nullable_type'     => true,
+        ];
+
+        $this->getMethodParametersTestHelper('/* '.__FUNCTION__.' */', $expected);
+
+    }//end testNamespaceOperatorTypeHint()
+
+
     /**
      * Test helper.
      *

tests/Core/File/GetMethodPropertiesTest.inc

@@ -80,3 +80,6 @@ function mixedTypeHint() :mixed {}
 /* testPHP8MixedTypeHintNullable */
 // Intentional fatal error - nullability is not allowed with mixed, but that's not the concern of the method.
 function mixedTypeHintNullable(): ?mixed {}
+
+/* testNamespaceOperatorTypeHint */
+function namespaceOperatorTypeHint() : ?namespace\Name {}

tests/Core/File/GetMethodPropertiesTest.php

@@ -452,6 +452,29 @@ public function testPHP8MixedTypeHintNullable()
     }//end testPHP8MixedTypeHintNullable()
 
 
+    /**
+     * Test a function with return type using the namespace operator.
+     *
+     * @return void
+     */
+    public function testNamespaceOperatorTypeHint()
+    {
+        $expected = [
+            'scope'                => 'public',
+            'scope_specified'      => false,
+            'return_type'          => '?namespace\Name',
+            'nullable_return_type' => true,
+            'is_abstract'          => false,
+            'is_final'             => false,
+            'is_static'            => false,
+            'has_body'             => true,
+        ];
+
+        $this->getMethodPropertiesTestHelper('/* '.__FUNCTION__.' */', $expected);
+
+    }//end testNamespaceOperatorTypeHint()
+
+
     /**
      * Test helper.
      *

tests/Core/Tokenizer/BackfillFnTokenTest.inc

@@ -63,6 +63,9 @@ $a = fn($x) => yield 'k' => $x;
 /* testNullableNamespace */
 $a = fn(?\DateTime $x) : ?\DateTime => $x;
 
+/* testNamespaceOperatorInTypes */
+$fn = fn(namespace\Foo $a) : ?namespace\Foo => $a;
+
 /* testSelfReturnType */
 fn(self $a) : self => $a;
 

tests/Core/Tokenizer/BackfillFnTokenTest.php

@@ -465,6 +465,34 @@ public function testNullableNamespace()
     }//end testNullableNamespace()
 
 
+    /**
+     * Test arrow functions that use the namespace operator in the return type.
+     *
+     * @covers PHP_CodeSniffer\Tokenizers\PHP::processAdditional
+     *
+     * @return void
+     */
+    public function testNamespaceOperatorInTypes()
+    {
+        $tokens = self::$phpcsFile->getTokens();
+
+        $token = $this->getTargetToken('/* testNamespaceOperatorInTypes */', T_FN);
+        $this->backfillHelper($token);
+
+        $this->assertSame($tokens[$token]['scope_opener'], ($token + 16), 'Scope opener is not the arrow token');
+        $this->assertSame($tokens[$token]['scope_closer'], ($token + 19), 'Scope closer is not the semicolon token');
+
+        $opener = $tokens[$token]['scope_opener'];
+        $this->assertSame($tokens[$opener]['scope_opener'], ($token + 16), 'Opener scope opener is not the arrow token');
+        $this->assertSame($tokens[$opener]['scope_closer'], ($token + 19), 'Opener scope closer is not the semicolon token');
+
+        $closer = $tokens[$token]['scope_closer'];
+        $this->assertSame($tokens[$closer]['scope_opener'], ($token + 16), 'Closer scope opener is not the arrow token');
+        $this->assertSame($tokens[$closer]['scope_closer'], ($token + 19), 'Closer scope closer is not the semicolon token');
+
+    }//end testNamespaceOperatorInTypes()
+
+
     /**
      * Test arrow functions that use self/parent/callable/array/static return types.
      *

tests/Core/Tokenizer/ScopeSettingWithNamespaceOperatorTest.inc

@@ -0,0 +1,19 @@
+<?php
+
+/* testClassExtends */
+class Foo extends namespace\Bar {}
+
+/* testClassImplements */
+$anon = new class implements namespace\Foo {}
+
+/* testInterfaceExtends */
+interface FooBar extends namespace\BarFoo {}
+
+/* testFunctionReturnType */
+function foo() : namespace\Baz {}
+
+/* testClosureReturnType */
+$closure = function () : namespace\Baz {}
+
+/* testArrowFunctionReturnType */
+$fn = fn() : namespace\Baz => new namespace\Baz;

tests/Core/Tokenizer/ScopeSettingWithNamespaceOperatorTest.php

@@ -0,0 +1,98 @@
+<?php
+/**
+ * Tests the adding of the "bracket_opener/closer" keys to use group tokens.
+ *
+ * @author    Juliette Reinders Folmer <phpcs_nospam@adviesenzo.nl>
+ * @copyright 2020 Squiz Pty Ltd (ABN 77 084 670 600)
+ * @license   https://github.com/squizlabs/PHP_CodeSniffer/blob/master/licence.txt BSD Licence
+ */
+
+namespace PHP_CodeSniffer\Tests\Core\Tokenizer;
+
+use PHP_CodeSniffer\Tests\Core\AbstractMethodUnitTest;
+
+class ScopeSettingWithNamespaceOperatorTest extends AbstractMethodUnitTest
+{
+
+
+    /**
+     * Test that the scope opener/closers are set correctly when the namespace keyword is encountered as an operator.
+     *
+     * @param string       $testMarker The comment which prefaces the target tokens in the test file.
+     * @param int|string[] $tokenTypes The token type to search for.
+     * @param int|string[] $open       Optional. The token type for the scope opener.
+     * @param int|string[] $close      Optional. The token type for the scope closer.
+     *
+     * @dataProvider dataScopeSetting
+     * @covers       PHP_CodeSniffer\Tokenizers\Tokenizer::recurseScopeMap
+     *
+     * @return void
+     */
+    public function testScopeSetting($testMarker, $tokenTypes, $open=T_OPEN_CURLY_BRACKET, $close=T_CLOSE_CURLY_BRACKET)
+    {
+        $tokens = self::$phpcsFile->getTokens();
+
+        $target = $this->getTargetToken($testMarker, $tokenTypes);
+        $opener = $this->getTargetToken($testMarker, $open);
+        $closer = $this->getTargetToken($testMarker, $close);
+
+        $this->assertArrayHasKey('scope_opener', $tokens[$target], 'Scope opener missing');
+        $this->assertArrayHasKey('scope_closer', $tokens[$target], 'Scope closer missing');
+        $this->assertSame($opener, $tokens[$target]['scope_opener'], 'Scope opener not same');
+        $this->assertSame($closer, $tokens[$target]['scope_closer'], 'Scope closer not same');
+
+        $this->assertArrayHasKey('scope_opener', $tokens[$opener], 'Scope opener missing for open curly');
+        $this->assertArrayHasKey('scope_closer', $tokens[$opener], 'Scope closer missing for open curly');
+        $this->assertSame($opener, $tokens[$opener]['scope_opener'], 'Scope opener not same for open curly');
+        $this->assertSame($closer, $tokens[$opener]['scope_closer'], 'Scope closer not same for open curly');
+
+        $this->assertArrayHasKey('scope_opener', $tokens[$closer], 'Scope opener missing for close curly');
+        $this->assertArrayHasKey('scope_closer', $tokens[$closer], 'Scope closer missing for close curly');
+        $this->assertSame($opener, $tokens[$closer]['scope_opener'], 'Scope opener not same for close curly');
+        $this->assertSame($closer, $tokens[$closer]['scope_closer'], 'Scope closer not same for close curly');
+
+    }//end testScopeSetting()
+
+
+    /**
+     * Data provider.
+     *
+     * @see testScopeSetting()
+     *
+     * @return array
+     */
+    public function dataScopeSetting()
+    {
+        return [
+            [
+                '/* testClassExtends */',
+                [T_CLASS],
+            ],
+            [
+                '/* testClassImplements */',
+                [T_ANON_CLASS],
+            ],
+            [
+                '/* testInterfaceExtends */',
+                [T_INTERFACE],
+            ],
+            [
+                '/* testFunctionReturnType */',
+                [T_FUNCTION],
+            ],
+            [
+                '/* testClosureReturnType */',
+                [T_CLOSURE],
+            ],
+            [
+                '/* testArrowFunctionReturnType */',
+                [T_FN],
+                [T_FN_ARROW],
+                [T_SEMICOLON],
+            ],
+        ];
+
+    }//end dataScopeSetting()
+
+
+}//end class