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<?php |
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/** |
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* Parser Reflection API |
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* |
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* @copyright Copyright 2015, Lisachenko Alexander <[email protected]> |
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* |
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* This source file is subject to the license that is bundled |
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* with this source code in the file LICENSE. |
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*/ |
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namespace Go\ParserReflection\ValueResolver; |
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use Go\ParserReflection\ReflectionClass; |
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use Go\ParserReflection\ReflectionException; |
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use Go\ParserReflection\ReflectionFileNamespace; |
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use PhpParser\Node; |
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use PhpParser\Node\Expr; |
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use PhpParser\Node\Scalar; |
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use PhpParser\Node\Scalar\MagicConst; |
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/** |
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* Tries to resolve expression into value |
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*/ |
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class NodeExpressionResolver |
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{ |
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/** |
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* List of exception for constant fetch |
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* |
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* @var array |
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*/ |
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private static $notConstants = [ |
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'true' => true, |
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'false' => true, |
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'null' => true, |
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]; |
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/** |
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* Name of the constant (if present) |
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* |
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* @var null|string |
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*/ |
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private $constantName = null; |
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/** |
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* Current reflection context for parsing |
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* |
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* @var mixed|\Go\ParserReflection\ReflectionClass |
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*/ |
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private $context; |
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/** |
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* Flag if expression is constant |
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* |
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* @var bool |
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*/ |
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private $isConstant = false; |
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/** |
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* Node resolving level, 1 = top-level |
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* |
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* @var int |
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*/ |
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private $nodeLevel = 0; |
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/** |
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* @var mixed Value of expression/constant |
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*/ |
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private $value; |
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public function __construct($context) |
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{ |
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$this->context = $context; |
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} |
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public function getConstantName() |
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{ |
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return $this->constantName; |
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} |
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public function getValue() |
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{ |
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return $this->value; |
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} |
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public function isConstant() |
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{ |
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return $this->isConstant; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function process(Node $node) |
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{ |
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$this->nodeLevel = 0; |
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$this->isConstant = false; |
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$this->constantName = null; |
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$this->value = $this->resolve($node); |
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} |
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/** |
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* Resolves node into valid value |
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* |
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* @param Node $node |
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* |
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* @return mixed |
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*/ |
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protected function resolve(Node $node) |
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{ |
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$value = null; |
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try { |
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++$this->nodeLevel; |
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$methodName = $this->getDispatchMethodFor($node); |
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if (method_exists($this, $methodName)) { |
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$value = $this->$methodName($node); |
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} |
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} finally { |
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--$this->nodeLevel; |
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} |
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return $value; |
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} |
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protected function resolveScalarDNumber(Scalar\DNumber $node) |
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{ |
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return $node->value; |
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} |
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protected function resolveScalarLNumber(Scalar\LNumber $node) |
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{ |
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return $node->value; |
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} |
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protected function resolveScalarString(Scalar\String_ $node) |
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{ |
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return $node->value; |
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} |
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protected function resolveScalarMagicConstMethod() |
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{ |
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if ($this->context instanceof \ReflectionMethod) { |
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$fullName = $this->context->getDeclaringClass()->name . '::' . $this->context->getShortName(); |
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return $fullName; |
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} |
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return ''; |
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} |
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protected function resolveScalarMagicConstFunction() |
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{ |
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if ($this->context instanceof \ReflectionFunctionAbstract) { |
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return $this->context->getName(); |
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} |
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return ''; |
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} |
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protected function resolveScalarMagicConstNamespace() |
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{ |
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if (method_exists($this->context, 'getNamespaceName')) { |
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return $this->context->getNamespaceName(); |
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} |
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if ($this->context instanceof ReflectionFileNamespace) { |
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return $this->context->getName(); |
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} |
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return ''; |
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} |
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protected function resolveScalarMagicConstClass() |
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{ |
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if ($this->context instanceof \ReflectionClass) { |
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return $this->context->name; |
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} |
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if (method_exists($this->context, 'getDeclaringClass')) { |
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$declaringClass = $this->context->getDeclaringClass(); |
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if ($declaringClass instanceof \ReflectionClass) { |
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return $declaringClass->name; |
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} |
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} |
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return ''; |
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} |
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protected function resolveScalarMagicConstDir() |
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{ |
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if (method_exists($this->context, 'getFileName')) { |
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return dirname($this->context->getFileName()); |
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} |
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return ''; |
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} |
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protected function resolveScalarMagicConstFile() |
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{ |
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if (method_exists($this->context, 'getFileName')) { |
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return $this->context->getFileName(); |
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} |
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return ''; |
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} |
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protected function resolveScalarMagicConstLine(MagicConst\Line $node) |
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{ |
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return $node->hasAttribute('startLine') ? $node->getAttribute('startLine') : 0; |
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} |
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protected function resolveScalarMagicConstTrait() |
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{ |
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if ($this->context instanceof \ReflectionClass && $this->context->isTrait()) { |
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return $this->context->name; |
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} |
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return ''; |
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} |
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protected function resolveExprConstFetch(Expr\ConstFetch $node) |
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{ |
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$constantValue = null; |
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$isResolved = false; |
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$isFQNConstant = $node->name instanceof Node\Name\FullyQualified; |
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$constantName = $node->name->toString(); |
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if (!$isFQNConstant) { |
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if (method_exists($this->context, 'getFileName')) { |
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$fileName = $this->context->getFileName(); |
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$namespaceName = $this->resolveScalarMagicConstNamespace(); |
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$fileNamespace = new ReflectionFileNamespace($fileName, $namespaceName); |
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if ($fileNamespace->hasConstant($constantName)) { |
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$constantValue = $fileNamespace->getConstant($constantName); |
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$constantName = $fileNamespace->getName() . '\\' . $constantName; |
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$isResolved = true; |
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} |
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} |
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} |
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if (!$isResolved && defined($constantName)) { |
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$constantValue = constant($constantName); |
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} |
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if ($this->nodeLevel === 1 && !isset(self::$notConstants[$constantName])) { |
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$this->isConstant = true; |
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$this->constantName = $constantName; |
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} |
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return $constantValue; |
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} |
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protected function resolveExprClassConstFetch(Expr\ClassConstFetch $node) |
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{ |
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$classToReflect = $node->class; |
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if (!($classToReflect instanceof Node\Name)) { |
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$classToReflect = $this->resolve($classToReflect) ?: $classToReflect; |
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if (!is_string($classToReflect)) { |
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$reason = 'Unable'; |
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if ($classToReflect instanceof Expr) { |
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$methodName = $this->getDispatchMethodFor($classToReflect); |
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$reason = "Method " . __CLASS__ . "::{$methodName}() not found trying"; |
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} |
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throw new ReflectionException("$reason to resolve class constant."); |
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} |
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// Strings evaluated as class names are always treated as fully |
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// qualified. |
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$classToReflect = new Node\Name\FullyQualified(ltrim($classToReflect, '\\')); |
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} |
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$refClass = $this->fetchReflectionClass($classToReflect); |
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$constantName = $node->name; |
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// special handling of ::class constants |
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if ('class' === $constantName) { |
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return $refClass->getName(); |
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} |
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$this->isConstant = true; |
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$this->constantName = (string)$classToReflect . '::' . $constantName; |
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return $refClass->getConstant($constantName); |
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} |
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protected function resolveExprArray(Expr\Array_ $node) |
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{ |
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$result = []; |
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foreach ($node->items as $itemIndex => $arrayItem) { |
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$itemValue = $this->resolve($arrayItem->value); |
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$itemKey = isset($arrayItem->key) ? $this->resolve($arrayItem->key) : $itemIndex; |
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$result[$itemKey] = $itemValue; |
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} |
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return $result; |
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} |
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protected function resolveExprBinaryOpPlus(Expr\BinaryOp\Plus $node) |
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{ |
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return $this->resolve($node->left) + $this->resolve($node->right); |
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} |
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protected function resolveExprBinaryOpMinus(Expr\BinaryOp\Minus $node) |
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{ |
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return $this->resolve($node->left) - $this->resolve($node->right); |
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} |
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protected function resolveExprBinaryOpMul(Expr\BinaryOp\Mul $node) |
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{ |
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return $this->resolve($node->left) * $this->resolve($node->right); |
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} |
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protected function resolveExprBinaryOpPow(Expr\BinaryOp\Pow $node) |
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{ |
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return pow($this->resolve($node->left), $this->resolve($node->right)); |
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} |
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protected function resolveExprBinaryOpDiv(Expr\BinaryOp\Div $node) |
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{ |
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return $this->resolve($node->left) / $this->resolve($node->right); |
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} |
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protected function resolveExprBinaryOpMod(Expr\BinaryOp\Mod $node) |
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{ |
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return $this->resolve($node->left) % $this->resolve($node->right); |
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} |
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protected function resolveExprBooleanNot(Expr\BooleanNot $node) |
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{ |
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return !$this->resolve($node->expr); |
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} |
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protected function resolveExprBitwiseNot(Expr\BitwiseNot $node) |
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{ |
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return ~$this->resolve($node->expr); |
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} |
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protected function resolveExprBinaryOpBitwiseOr(Expr\BinaryOp\BitwiseOr $node) |
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{ |
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return $this->resolve($node->left) | $this->resolve($node->right); |
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} |
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1 |
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protected function resolveExprBinaryOpBitwiseAnd(Expr\BinaryOp\BitwiseAnd $node) |
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{ |
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return $this->resolve($node->left) & $this->resolve($node->right); |
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} |
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1 |
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protected function resolveExprBinaryOpBitwiseXor(Expr\BinaryOp\BitwiseXor $node) |
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{ |
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1 |
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return $this->resolve($node->left) ^ $this->resolve($node->right); |
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} |
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1 |
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protected function resolveExprBinaryOpShiftLeft(Expr\BinaryOp\ShiftLeft $node) |
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{ |
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1 |
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return $this->resolve($node->left) << $this->resolve($node->right); |
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} |
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1 |
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protected function resolveExprBinaryOpShiftRight(Expr\BinaryOp\ShiftRight $node) |
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{ |
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return $this->resolve($node->left) >> $this->resolve($node->right); |
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} |
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3 |
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protected function resolveExprBinaryOpConcat(Expr\BinaryOp\Concat $node) |
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{ |
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return $this->resolve($node->left) . $this->resolve($node->right); |
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} |
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protected function resolveExprTernary(Expr\Ternary $node) |
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{ |
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1 |
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if (isset($node->if)) { |
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// Full syntax $a ? $b : $c; |
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return $this->resolve($node->cond) ? $this->resolve($node->if) : $this->resolve($node->else); |
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} else { |
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// Short syntax $a ?: $c; |
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1 |
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return $this->resolve($node->cond) ?: $this->resolve($node->else); |
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} |
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} |
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1 |
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protected function resolveExprBinaryOpSmallerOrEqual(Expr\BinaryOp\SmallerOrEqual $node) |
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{ |
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return $this->resolve($node->left) <= $this->resolve($node->right); |
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} |
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385
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1 |
|
protected function resolveExprBinaryOpGreaterOrEqual(Expr\BinaryOp\GreaterOrEqual $node) |
386
|
|
|
{ |
387
|
1 |
|
return $this->resolve($node->left) >= $this->resolve($node->right); |
388
|
|
|
} |
389
|
|
|
|
390
|
1 |
|
protected function resolveExprBinaryOpEqual(Expr\BinaryOp\Equal $node) |
391
|
|
|
{ |
392
|
1 |
|
return $this->resolve($node->left) == $this->resolve($node->right); |
393
|
|
|
} |
394
|
|
|
|
395
|
1 |
|
protected function resolveExprBinaryOpNotEqual(Expr\BinaryOp\NotEqual $node) |
396
|
|
|
{ |
397
|
1 |
|
return $this->resolve($node->left) != $this->resolve($node->right); |
398
|
|
|
} |
399
|
|
|
|
400
|
1 |
|
protected function resolveExprBinaryOpSmaller(Expr\BinaryOp\Smaller $node) |
401
|
|
|
{ |
402
|
1 |
|
return $this->resolve($node->left) < $this->resolve($node->right); |
403
|
|
|
} |
404
|
|
|
|
405
|
2 |
|
protected function resolveExprBinaryOpGreater(Expr\BinaryOp\Greater $node) |
406
|
|
|
{ |
407
|
2 |
|
return $this->resolve($node->left) > $this->resolve($node->right); |
408
|
|
|
} |
409
|
|
|
|
410
|
1 |
|
protected function resolveExprBinaryOpIdentical(Expr\BinaryOp\Identical $node) |
411
|
|
|
{ |
412
|
1 |
|
return $this->resolve($node->left) === $this->resolve($node->right); |
413
|
|
|
} |
414
|
|
|
|
415
|
1 |
|
protected function resolveExprBinaryOpNotIdentical(Expr\BinaryOp\NotIdentical $node) |
416
|
|
|
{ |
417
|
1 |
|
return $this->resolve($node->left) !== $this->resolve($node->right); |
418
|
|
|
} |
419
|
|
|
|
420
|
1 |
|
protected function resolveExprBinaryOpBooleanAnd(Expr\BinaryOp\BooleanAnd $node) |
421
|
|
|
{ |
422
|
1 |
|
return $this->resolve($node->left) && $this->resolve($node->right); |
423
|
|
|
} |
424
|
|
|
|
425
|
1 |
|
protected function resolveExprBinaryOpLogicalAnd(Expr\BinaryOp\LogicalAnd $node) |
426
|
|
|
{ |
427
|
1 |
|
return $this->resolve($node->left) and $this->resolve($node->right); |
428
|
|
|
} |
429
|
|
|
|
430
|
1 |
|
protected function resolveExprBinaryOpBooleanOr(Expr\BinaryOp\BooleanOr $node) |
431
|
|
|
{ |
432
|
1 |
|
return $this->resolve($node->left) || $this->resolve($node->right); |
433
|
|
|
} |
434
|
|
|
|
435
|
1 |
|
protected function resolveExprBinaryOpLogicalOr(Expr\BinaryOp\LogicalOr $node) |
436
|
|
|
{ |
437
|
1 |
|
return $this->resolve($node->left) or $this->resolve($node->right); |
438
|
|
|
} |
439
|
|
|
|
440
|
1 |
|
protected function resolveExprBinaryOpLogicalXor(Expr\BinaryOp\LogicalXor $node) |
441
|
|
|
{ |
442
|
1 |
|
return $this->resolve($node->left) xor $this->resolve($node->right); |
443
|
|
|
} |
444
|
|
|
|
445
|
50 |
|
private function getDispatchMethodFor(Node $node) |
446
|
|
|
{ |
447
|
50 |
|
$nodeType = $node->getType(); |
448
|
50 |
|
return 'resolve' . str_replace('_', '', $nodeType); |
449
|
|
|
} |
450
|
|
|
|
451
|
|
|
/** |
452
|
|
|
* Utility method to fetch reflection class instance by name |
453
|
|
|
* |
454
|
|
|
* Supports: |
455
|
|
|
* 'self' keyword |
456
|
|
|
* 'parent' keyword |
457
|
|
|
* not-FQN class names |
458
|
|
|
* |
459
|
|
|
* @param Node\Name $node Class name node |
460
|
|
|
* |
461
|
|
|
* @return bool|\ReflectionClass |
462
|
|
|
* |
463
|
|
|
* @throws ReflectionException |
464
|
|
|
*/ |
465
|
12 |
|
private function fetchReflectionClass(Node\Name $node) |
466
|
|
|
{ |
467
|
12 |
|
$className = $node->toString(); |
468
|
12 |
|
$isFQNClass = $node instanceof Node\Name\FullyQualified; |
469
|
12 |
|
if ($isFQNClass) { |
470
|
|
|
// check to see if the class is already loaded and is safe to use |
471
|
|
|
// PHP's ReflectionClass to determine if the class is user defined |
472
|
6 |
|
if (class_exists($className, false)) { |
473
|
6 |
|
$refClass = new \ReflectionClass($className); |
474
|
6 |
|
if (!$refClass->isUserDefined()) { |
475
|
3 |
|
return $refClass; |
476
|
|
|
} |
477
|
|
|
} |
478
|
4 |
|
return new ReflectionClass($className); |
479
|
|
|
} |
480
|
|
|
|
481
|
8 |
|
if ('self' === $className) { |
482
|
8 |
|
if ($this->context instanceof \ReflectionClass) { |
483
|
8 |
|
return $this->context; |
484
|
|
|
} elseif (method_exists($this->context, 'getDeclaringClass')) { |
485
|
|
|
return $this->context->getDeclaringClass(); |
486
|
|
|
} |
487
|
|
|
} |
488
|
|
|
|
489
|
1 |
|
if ('parent' === $className) { |
490
|
1 |
|
if ($this->context instanceof \ReflectionClass) { |
491
|
1 |
|
return $this->context->getParentClass(); |
492
|
|
|
} elseif (method_exists($this->context, 'getDeclaringClass')) { |
493
|
|
|
return $this->context->getDeclaringClass()->getParentClass(); |
494
|
|
|
} |
495
|
|
|
} |
496
|
|
|
|
497
|
|
|
if (method_exists($this->context, 'getFileName')) { |
498
|
|
|
/** @var ReflectionFileNamespace|null $fileNamespace */ |
499
|
|
|
$fileName = $this->context->getFileName(); |
500
|
|
|
$namespaceName = $this->resolveScalarMagicConstNamespace(); |
501
|
|
|
|
502
|
|
|
$fileNamespace = new ReflectionFileNamespace($fileName, $namespaceName); |
503
|
|
|
return $fileNamespace->getClass($className); |
504
|
|
|
} |
505
|
|
|
|
506
|
|
|
throw new ReflectionException("Can not resolve class $className"); |
507
|
|
|
} |
508
|
|
|
} |
509
|
|
|
|