PHPStan Level 3

.travis.yml

@@ -25,7 +25,6 @@ cache:
     - validation/frameworks
 
 before_script:
-  - if [[ $STATIC_ANALYSIS = true ]]; then composer require phpstan/phpstan --no-update; fi
   - composer install
   - set -e # Stop on first error.
   - phpenv config-rm xdebug.ini || true

composer.json

@@ -6,7 +6,8 @@
         "php": ">=7.2"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.5.15"
+        "phpunit/phpunit": "^8.5.15",
+        "phpstan/phpstan": "^1.8"
     },
     "license": "MIT",
     "authors": [

phpstan.neon

@@ -1,5 +1,5 @@
 parameters:
-    level: 2
+    level: 3
     paths:
         - src/
     ignoreErrors:

src/Node.php

@@ -140,6 +140,8 @@ public function getRoot() : Node {
         while ($node->parent !== null) {
             $node = $node->parent;
         }
+
+        /** @var SourceFileNode $node */
         return $node;
     }
 
@@ -613,6 +615,7 @@ public function getNamespaceDefinition() {
             $namespaceDefinition = null;
         }
 
+        /** @var NamespaceDefinition|null $namespaceDefinition */
         return $namespaceDefinition;
     }
 

src/Node/EnumCaseDeclaration.php

@@ -16,7 +16,7 @@ class EnumCaseDeclaration extends Node {
     /** @var Token */
     public $caseKeyword;
 
-    /** @var QualifiedName */
+    /** @var Token */
     public $name;
 
     /** @var Token|null */

src/Node/Expression/AssignmentExpression.php

@@ -11,7 +11,7 @@
 
 class AssignmentExpression extends BinaryExpression {
 
-    /** @var Expression */
+    /** @var Expression|Token */
     public $leftOperand;
 
     /** @var Token */

src/Node/Expression/BinaryExpression.php

@@ -11,13 +11,13 @@
 
 class BinaryExpression extends Expression {
 
-    /** @var Expression */
+    /** @var Expression|Token */
     public $leftOperand;
 
     /** @var Token */
     public $operator;
 
-    /** @var Expression */
+    /** @var Expression|Token */
     public $rightOperand;
 
     const CHILD_NAMES = [

src/Node/Expression/PrefixUpdateExpression.php

@@ -13,9 +13,6 @@ class PrefixUpdateExpression extends UnaryExpression {
     /** @var Token */
     public $incrementOrDecrementOperator;
 
-    /** @var Variable */
-    public $operand;
-
     const CHILD_NAMES = [
         'incrementOrDecrementOperator',
         'operand'

src/Node/Expression/SubscriptExpression.php

@@ -6,6 +6,7 @@
 
 namespace Microsoft\PhpParser\Node\Expression;
 
+use Microsoft\PhpParser\MissingToken;
 use Microsoft\PhpParser\Node\Expression;
 use Microsoft\PhpParser\Token;
 
@@ -17,7 +18,7 @@ class SubscriptExpression extends Expression {
     /** @var Token */
     public $openBracketOrBrace;
 
-    /** @var Expression */
+    /** @var Expression|MissingToken */
     public $accessExpression;
 
     /** @var Token */

src/Node/Expression/UnaryExpression.php

@@ -7,9 +7,10 @@
 namespace Microsoft\PhpParser\Node\Expression;
 
 use Microsoft\PhpParser\Node\Expression;
+use Microsoft\PhpParser\Token;
 
 class UnaryExpression extends Expression {
-    /** @var UnaryExpression|Variable */
+    /** @var Expression|Variable|Token */
     public $operand;
 
     const CHILD_NAMES = [

src/Node/Expression/UnaryOpExpression.php

@@ -13,9 +13,6 @@ class UnaryOpExpression extends UnaryExpression {
     /** @var Token */
     public $operator;
 
-    /** @var UnaryExpression */
-    public $operand;
-
     const CHILD_NAMES = [
         'operator',
         'operand'

src/Node/FunctionReturnType.php

@@ -6,6 +6,7 @@
 
 namespace Microsoft\PhpParser\Node;
 
+use Microsoft\PhpParser\MissingToken;
 use Microsoft\PhpParser\Token;
 
 trait FunctionReturnType {
@@ -14,6 +15,6 @@ trait FunctionReturnType {
     // TODO: This may be the wrong choice if ?type can ever be mixed with other types in union types
     /** @var Token|null */
     public $questionToken;
-    /** @var DelimitedList\QualifiedNameList|null */
+    /** @var DelimitedList\QualifiedNameList|null|MissingToken */
     public $returnTypeList;
 }

src/Node/MissingMemberDeclaration.php

@@ -6,6 +6,7 @@
 
 namespace Microsoft\PhpParser\Node;
 
+use Microsoft\PhpParser\MissingToken;
 use Microsoft\PhpParser\ModifiedTypeInterface;
 use Microsoft\PhpParser\ModifiedTypeTrait;
 use Microsoft\PhpParser\Node;
@@ -20,7 +21,7 @@ class MissingMemberDeclaration extends Node implements ModifiedTypeInterface {
     /** @var Token|null needed along with typeDeclaration for what looked like typed property declarations but was missing VariableName */
     public $questionToken;
 
-    /** @var DelimitedList\QualifiedNameList|null */
+    /** @var DelimitedList\QualifiedNameList|null|MissingToken */
     public $typeDeclarationList;
 
     const CHILD_NAMES = [

src/Node/NamespaceUseClause.php

@@ -6,12 +6,13 @@
 
 namespace Microsoft\PhpParser\Node;
 
+use Microsoft\PhpParser\MissingToken;
 use Microsoft\PhpParser\Node;
 use Microsoft\PhpParser\Node\DelimitedList;
 use Microsoft\PhpParser\Token;
 
 class NamespaceUseClause extends Node {
-    /** @var QualifiedName */
+    /** @var QualifiedName|MissingToken */
     public $namespaceName;
     /** @var NamespaceAliasingClause */
     public $namespaceAliasingClause;

src/Node/Statement/InlineHtml.php

@@ -20,7 +20,7 @@ class InlineHtml extends StatementNode {
     public $scriptSectionStartTag;
 
     /**
-     * @var ExpressionStatement|null used to represent the expression echoed by `<?=` while parsing.
+     * @var EchoStatement|null used to represent the expression echoed by `<?=` while parsing.
      *
      * This should always be null in the returned AST,
      * and is deliberately excluded from CHILD_NAMES.

src/Node/Statement/NamespaceDefinition.php

@@ -6,6 +6,7 @@
 
 namespace Microsoft\PhpParser\Node\Statement;
 
+use Microsoft\PhpParser\MissingToken;
 use Microsoft\PhpParser\Node\QualifiedName;
 use Microsoft\PhpParser\Node\StatementNode;
 use Microsoft\PhpParser\Token;
@@ -17,7 +18,7 @@
 class NamespaceDefinition extends StatementNode {
     /** @var Token */
     public $namespaceKeyword;
-    /** @var QualifiedName|null */
+    /** @var QualifiedName|null|MissingToken */
     public $name;
     /** @var CompoundStatementNode|Token */
     public $compoundStatementOrSemicolon;

src/Parser.php

@@ -691,7 +691,7 @@ private function parseClassDeclaration($parentNode) : Node {
         return $classNode;
     }
 
-    private function parseClassMembers($parentNode) : Node {
+    private function parseClassMembers($parentNode) : ClassMembersNode {
         $classMembers = new ClassMembersNode();
         $classMembers->openBrace = $this->eat1(TokenKind::OpenBraceToken);
         $classMembers->classMemberDeclarations = $this->parseList($classMembers, ParseContext::ClassMembers);
@@ -804,7 +804,7 @@ private function parseAttributeGroups($parentNode): array
     }
 
     /**
-     * @return DelimitedList\AttributeElementList
+     * @return DelimitedList\AttributeElementList|null
      */
     private function parseAttributeElementList(AttributeGroup $parentNode) {
         return $this->parseDelimitedList(
@@ -1638,13 +1638,14 @@ private function isParameterStartFn() {
     }
 
     /**
-     * @param string $className (name of subclass of DelimitedList)
+     * @template TDelimitedList of DelimitedList
+     * @param class-string<TDelimitedList> $className (name of subclass of DelimitedList)
      * @param int|int[] $delimiter
      * @param callable $isElementStartFn
      * @param callable $parseElementFn
      * @param Node $parentNode
      * @param bool $allowEmptyElements
-     * @return DelimitedList|null instance of $className
+     * @return TDelimitedList|null instance of $className
      */
     private function parseDelimitedList($className, $delimiter, $isElementStartFn, $parseElementFn, $parentNode, $allowEmptyElements = false) {
         // TODO consider allowing empty delimiter to be more tolerant
@@ -1994,7 +1995,7 @@ private function parseWhileStatement($parentNode) {
     /**
      * @param Node $parentNode
      * @param bool $force
-     * @return Node|MissingToken|array - The expression, or a missing token, or (if $force) an array containing a missed and skipped token
+     * @return Expression|MissingToken|array - The expression, or a missing token, or (if $force) an array containing a missed and skipped token
      */
     private function parseExpression($parentNode, $force = false) {
         $token = $this->getCurrentToken();
@@ -2020,7 +2021,7 @@ private function parseExpressionFn() {
 
     /**
      * @param Node $parentNode
-     * @return Expression
+     * @return UnaryExpression|MissingToken|Variable|ThrowExpression
      */
     private function parseUnaryExpressionOrHigher($parentNode) {
         $token = $this->getCurrentToken();
@@ -3212,9 +3213,16 @@ private function parseMemberAccessExpression($expression):MemberAccessExpression
     private function parseScopedPropertyAccessExpression($expression, $fallbackParentNode): ScopedPropertyAccessExpression {
         $scopedPropertyAccessExpression = new ScopedPropertyAccessExpression();
         $scopedPropertyAccessExpression->parent = $expression->parent ?? $fallbackParentNode;
+
         if ($expression instanceof Node) {
             $expression->parent = $scopedPropertyAccessExpression;
-            $scopedPropertyAccessExpression->scopeResolutionQualifier = $expression; // TODO ensure always a Node
+
+            // scopeResolutionQualifier does not accept `Node` but
+            // `Expression|QualifiedName|Token`. I'm not sure if we can depend
+            // on that being the case.
+            //
+            // @phpstan-ignore-next-line
+            $scopedPropertyAccessExpression->scopeResolutionQualifier = $expression;
         }
 
         $scopedPropertyAccessExpression->doubleColon = $this->eat1(TokenKind::ColonColonToken);
@@ -3362,18 +3370,18 @@ private function parseClassConstDeclaration($parentNode, $modifiers) {
     }
 
     private function parseEnumCaseDeclaration($parentNode) {
-        $classConstDeclaration = new EnumCaseDeclaration();
-        $classConstDeclaration->parent = $parentNode;
-        $classConstDeclaration->caseKeyword = $this->eat1(TokenKind::CaseKeyword);
-        $classConstDeclaration->name = $this->eat($this->nameOrKeywordOrReservedWordTokens);
-        $classConstDeclaration->equalsToken = $this->eatOptional1(TokenKind::EqualsToken);
-        if ($classConstDeclaration->equalsToken !== null) {
+        $enumCaseDeclaration = new EnumCaseDeclaration();
+        $enumCaseDeclaration->parent = $parentNode;
+        $enumCaseDeclaration->caseKeyword = $this->eat1(TokenKind::CaseKeyword);
+        $enumCaseDeclaration->name = $this->eat($this->nameOrKeywordOrReservedWordTokens);
+        $enumCaseDeclaration->equalsToken = $this->eatOptional1(TokenKind::EqualsToken);
+        if ($enumCaseDeclaration->equalsToken !== null) {
             // TODO add post-parse rule that checks for invalid assignments
-            $classConstDeclaration->assignment = $this->parseExpression($classConstDeclaration);
+            $enumCaseDeclaration->assignment = $this->parseExpression($enumCaseDeclaration);
         }
-        $classConstDeclaration->semicolon = $this->eat1(TokenKind::SemicolonToken);
+        $enumCaseDeclaration->semicolon = $this->eat1(TokenKind::SemicolonToken);
 
-        return $classConstDeclaration;
+        return $enumCaseDeclaration;
     }
 
     /**
@@ -3446,7 +3454,7 @@ private function parseQualifiedNameCatchList($parentNode) {
         return $result;
     }
 
-    private function parseInterfaceDeclaration($parentNode) {
+    private function parseInterfaceDeclaration($parentNode): InterfaceDeclaration {
         $interfaceDeclaration = new InterfaceDeclaration(); // TODO verify not nested
         $interfaceDeclaration->parent = $parentNode;
         $interfaceDeclaration->interfaceKeyword = $this->eat1(TokenKind::InterfaceKeyword);
@@ -3456,7 +3464,7 @@ private function parseInterfaceDeclaration($parentNode) {
         return $interfaceDeclaration;
     }
 
-    private function parseInterfaceMembers($parentNode) : Node {
+    private function parseInterfaceMembers($parentNode) : InterfaceMembers {
         $interfaceMembers = new InterfaceMembers();
         $interfaceMembers->openBrace = $this->eat1(TokenKind::OpenBraceToken);
         $interfaceMembers->interfaceMemberDeclarations = $this->parseList($interfaceMembers, ParseContext::InterfaceMembers);