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psalm/src/Psalm/Checker/Statements/Expression/CallChecker.php
Matthew Brown 3ade4b9559 Fix #293, be case invariant to self & static
2017-11-14 21:56:29 -05:00

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<?php
namespace Psalm\Checker\Statements\Expression;
use PhpParser;
use Psalm\Checker\AlgebraChecker;
use Psalm\Checker\ClassChecker;
use Psalm\Checker\ClassLikeChecker;
use Psalm\Checker\FunctionChecker;
use Psalm\Checker\FunctionLikeChecker;
use Psalm\Checker\MethodChecker;
use Psalm\Checker\ProjectChecker;
use Psalm\Checker\Statements\ExpressionChecker;
use Psalm\Checker\StatementsChecker;
use Psalm\Checker\TypeChecker;
use Psalm\CodeLocation;
use Psalm\Config;
use Psalm\Context;
use Psalm\FunctionLikeParameter;
use Psalm\Issue\AbstractInstantiation;
use Psalm\Issue\DeprecatedClass;
use Psalm\Issue\ForbiddenCode;
use Psalm\Issue\ImplicitToStringCast;
use Psalm\Issue\InvalidArgument;
use Psalm\Issue\InvalidFunctionCall;
use Psalm\Issue\InvalidMethodCall;
use Psalm\Issue\InvalidPassByReference;
use Psalm\Issue\InvalidScalarArgument;
use Psalm\Issue\InvalidScope;
use Psalm\Issue\MixedArgument;
use Psalm\Issue\MixedMethodCall;
use Psalm\Issue\NullArgument;
use Psalm\Issue\NullFunctionCall;
use Psalm\Issue\NullReference;
use Psalm\Issue\ParentNotFound;
use Psalm\Issue\PossiblyFalseArgument;
use Psalm\Issue\PossiblyFalseReference;
use Psalm\Issue\PossiblyInvalidArgument;
use Psalm\Issue\PossiblyNullArgument;
use Psalm\Issue\PossiblyNullFunctionCall;
use Psalm\Issue\PossiblyNullReference;
use Psalm\Issue\PossiblyUndefinedMethod;
use Psalm\Issue\TooFewArguments;
use Psalm\Issue\TooManyArguments;
use Psalm\Issue\TypeCoercion;
use Psalm\Issue\UndefinedFunction;
use Psalm\Issue\UndefinedMethod;
use Psalm\IssueBuffer;
use Psalm\Storage\ClassLikeStorage;
use Psalm\Storage\FunctionLikeStorage;
use Psalm\Type;
use Psalm\Type\Atomic\ObjectLike;
use Psalm\Type\Atomic\TArray;
use Psalm\Type\Atomic\TCallable;
use Psalm\Type\Atomic\TGenericObject;
use Psalm\Type\Atomic\TMixed;
use Psalm\Type\Atomic\TNamedObject;
use Psalm\Type\Atomic\TNull;
class CallChecker
{
/**
* @param StatementsChecker $statements_checker
* @param PhpParser\Node\Expr\FuncCall $stmt
* @param Context $context
*
* @return false|null
*/
public static function analyzeFunctionCall(
ProjectChecker $project_checker,
StatementsChecker $statements_checker,
PhpParser\Node\Expr\FuncCall $stmt,
Context $context
) {
$method = $stmt->name;
if ($method instanceof PhpParser\Node\Name) {
$first_arg = isset($stmt->args[0]) ? $stmt->args[0] : null;
if ($method->parts === ['method_exists']) {
$context->check_methods = false;
} elseif ($method->parts === ['class_exists']) {
if ($first_arg && $first_arg->value instanceof PhpParser\Node\Scalar\String_) {
$context->addPhantomClass($first_arg->value->value);
} else {
$context->check_classes = false;
}
} elseif ($method->parts === ['function_exists']) {
$context->check_functions = false;
} elseif ($method->parts === ['is_callable']) {
$context->check_methods = false;
$context->check_functions = false;
} elseif ($method->parts === ['defined']) {
$context->check_consts = false;
} elseif ($method->parts === ['extract']) {
$context->check_variables = false;
} elseif ($method->parts === ['var_dump'] || $method->parts === ['shell_exec']) {
if (IssueBuffer::accepts(
new ForbiddenCode(
'Unsafe ' . implode('', $method->parts),
new CodeLocation($statements_checker->getSource(), $stmt)
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
} elseif ($method->parts === ['define']) {
if ($first_arg && $first_arg->value instanceof PhpParser\Node\Scalar\String_) {
$second_arg = $stmt->args[1];
ExpressionChecker::analyze($statements_checker, $second_arg->value, $context);
$const_name = $first_arg->value->value;
$statements_checker->setConstType(
$const_name,
isset($second_arg->value->inferredType) ? $second_arg->value->inferredType : Type::getMixed(),
$context
);
} else {
$context->check_consts = false;
}
}
}
$method_id = null;
$function_params = null;
$in_call_map = false;
$is_stubbed = false;
$function_storage = null;
$code_location = new CodeLocation($statements_checker->getSource(), $stmt);
$defined_constants = [];
$function_exists = false;
if ($stmt->name instanceof PhpParser\Node\Expr) {
if (ExpressionChecker::analyze($statements_checker, $stmt->name, $context) === false) {
return false;
}
if (isset($stmt->name->inferredType)) {
if ($stmt->name->inferredType->isNull()) {
if (IssueBuffer::accepts(
new NullFunctionCall(
'Cannot call function on null value',
new CodeLocation($statements_checker->getSource(), $stmt)
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
return;
}
if ($stmt->name->inferredType->isNullable()) {
if (IssueBuffer::accepts(
new PossiblyNullFunctionCall(
'Cannot call function on possibly null value',
new CodeLocation($statements_checker->getSource(), $stmt)
),
$statements_checker->getSuppressedIssues()
)) {
// fall through
}
}
foreach ($stmt->name->inferredType->types as $var_type_part) {
if ($var_type_part instanceof Type\Atomic\Fn) {
$function_params = $var_type_part->params;
if ($var_type_part->return_type) {
if (isset($stmt->inferredType)) {
$stmt->inferredType = Type::combineUnionTypes(
$stmt->inferredType,
$var_type_part->return_type
);
} else {
$stmt->inferredType = $var_type_part->return_type;
}
}
$function_exists = true;
} elseif ($var_type_part instanceof TMixed) {
// @todo maybe emit issue here
} elseif (($var_type_part instanceof TNamedObject && $var_type_part->value === 'Closure') ||
$var_type_part instanceof TCallable
) {
// this is fine
} elseif ($var_type_part instanceof TNull) {
// handled above
} elseif (!$var_type_part instanceof TNamedObject ||
!ClassLikeChecker::classOrInterfaceExists(
$project_checker,
$var_type_part->value
) ||
!MethodChecker::methodExists(
$project_checker,
$var_type_part->value . '::__invoke'
)
) {
$var_id = ExpressionChecker::getVarId(
$stmt->name,
$statements_checker->getFQCLN(),
$statements_checker
);
if (IssueBuffer::accepts(
new InvalidFunctionCall(
'Cannot treat ' . $var_id . ' of type ' . $var_type_part . ' as function',
new CodeLocation($statements_checker->getSource(), $stmt)
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
}
}
}
if (!isset($stmt->inferredType)) {
$stmt->inferredType = Type::getMixed();
}
} else {
$method_id = implode('\\', $stmt->name->parts);
$in_call_map = FunctionChecker::inCallMap($method_id);
$is_stubbed = isset(FunctionChecker::$stubbed_functions[strtolower($method_id)]);
$is_predefined = true;
if (!$in_call_map) {
$predefined_functions = Config::getInstance()->getPredefinedFunctions();
$is_predefined = isset($predefined_functions[$method_id]);
}
if (!$in_call_map && !$stmt->name instanceof PhpParser\Node\Name\FullyQualified) {
$method_id = FunctionChecker::getFQFunctionNameFromString($method_id, $statements_checker);
}
if (!$in_call_map && !$is_stubbed) {
if ($context->check_functions) {
if (self::checkFunctionExists(
$statements_checker,
$method_id,
$code_location
) === false
) {
return false;
}
}
$function_exists = FunctionChecker::functionExists(
$statements_checker,
strtolower($method_id)
);
} else {
$function_exists = true;
}
if ($function_exists) {
if (!$in_call_map || $is_stubbed) {
$function_storage = FunctionChecker::getStorage(
$statements_checker,
strtolower($method_id)
);
$function_params = $function_storage->params;
if (!$is_predefined) {
$defined_constants = $function_storage->defined_constants;
}
}
if ($in_call_map && !$is_stubbed) {
$function_params = FunctionLikeChecker::getFunctionParamsFromCallMapById(
$statements_checker->getFileChecker()->project_checker,
$method_id,
$stmt->args
);
}
}
}
if (self::checkFunctionArguments(
$statements_checker,
$stmt->args,
$function_params,
$method_id,
$context
) === false) {
// fall through
}
$config = Config::getInstance();
if ($function_exists) {
$generic_params = null;
if ($stmt->name instanceof PhpParser\Node\Name && $method_id) {
if (!$is_stubbed && $in_call_map) {
$function_params = FunctionLikeChecker::getFunctionParamsFromCallMapById(
$statements_checker->getFileChecker()->project_checker,
$method_id,
$stmt->args
);
}
}
// do this here to allow closure param checks
if (self::checkFunctionArgumentsMatch(
$statements_checker,
$stmt->args,
$method_id,
$function_params ?: [],
$function_storage,
null,
$generic_params,
$code_location,
$context
) === false) {
// fall through
}
if ($stmt->name instanceof PhpParser\Node\Name && $method_id) {
if (!$in_call_map || $is_stubbed) {
if ($function_storage && $function_storage->template_types) {
foreach ($function_storage->template_types as $template_name => $_) {
if (!isset($generic_params[$template_name])) {
$generic_params[$template_name] = Type::getMixed();
}
}
}
try {
if ($function_storage && $function_storage->return_type) {
if ($generic_params) {
$return_type = FunctionChecker::replaceTemplateTypes(
$function_storage->return_type,
$generic_params
);
} else {
$return_type = clone $function_storage->return_type;
}
$return_type_location = $function_storage->return_type_location;
$stmt->inferredType = $return_type;
// only check the type locally if it's defined externally
if ($return_type_location &&
!$is_stubbed && // makes lookups or array_* functions quicker
!$config->isInProjectDirs($return_type_location->file_path)
) {
$return_type->check(
$statements_checker,
new CodeLocation($statements_checker->getSource(), $stmt),
$statements_checker->getSuppressedIssues(),
$context->getPhantomClasses()
);
}
}
} catch (\InvalidArgumentException $e) {
// this can happen when the function was defined in the Config startup script
$stmt->inferredType = Type::getMixed();
}
} else {
$stmt->inferredType = FunctionChecker::getReturnTypeFromCallMapWithArgs(
$statements_checker,
$method_id,
$stmt->args,
$code_location,
$statements_checker->getSuppressedIssues()
);
}
}
foreach ($defined_constants as $const_name => $const_type) {
$context->constants[$const_name] = clone $const_type;
$context->vars_in_scope[$const_name] = clone $const_type;
}
if (Config::getInstance()->use_assert_for_type &&
$method instanceof PhpParser\Node\Name &&
$method->parts === ['assert'] &&
isset($stmt->args[0])
) {
$assert_clauses = AlgebraChecker::getFormula(
$stmt->args[0]->value,
$statements_checker->getFQCLN(),
$statements_checker
);
$simplified_clauses = AlgebraChecker::simplifyCNF(array_merge($context->clauses, $assert_clauses));
$assert_type_assertions = AlgebraChecker::getTruthsFromFormula($simplified_clauses);
$changed_vars = [];
// while in an and, we allow scope to boil over to support
// statements of the form if ($x && $x->foo())
$op_vars_in_scope = TypeChecker::reconcileKeyedTypes(
$assert_type_assertions,
$context->vars_in_scope,
$changed_vars,
$statements_checker,
new CodeLocation($statements_checker->getSource(), $stmt),
$statements_checker->getSuppressedIssues()
);
if ($op_vars_in_scope === false) {
return false;
}
foreach ($changed_vars as $changed_var) {
if (isset($op_vars_in_scope[$changed_var])) {
$op_vars_in_scope[$changed_var]->from_docblock = true;
}
}
$context->vars_in_scope = $op_vars_in_scope;
}
}
if (!$config->remember_property_assignments_after_call && !$context->collect_initializations) {
$context->removeAllObjectVars();
}
if ($stmt->name instanceof PhpParser\Node\Name &&
($stmt->name->parts === ['get_class'] || $stmt->name->parts === ['gettype']) &&
$stmt->args
) {
$var = $stmt->args[0]->value;
if ($var instanceof PhpParser\Node\Expr\Variable && is_string($var->name)) {
$atomic_type = $stmt->name->parts === ['get_class']
? new Type\Atomic\GetClassT('$' . $var->name)
: new Type\Atomic\GetTypeT('$' . $var->name);
$stmt->inferredType = new Type\Union([$atomic_type]);
}
}
return null;
}
/**
* @param StatementsChecker $statements_checker
* @param PhpParser\Node\Expr\New_ $stmt
* @param Context $context
*
* @return false|null
*/
public static function analyzeNew(
StatementsChecker $statements_checker,
PhpParser\Node\Expr\New_ $stmt,
Context $context
) {
$fq_class_name = null;
$project_checker = $statements_checker->getFileChecker()->project_checker;
$late_static = false;
if ($stmt->class instanceof PhpParser\Node\Name) {
if (!in_array(strtolower($stmt->class->parts[0]), ['self', 'static', 'parent'], true)) {
$fq_class_name = ClassLikeChecker::getFQCLNFromNameObject(
$stmt->class,
$statements_checker->getAliases()
);
if ($context->check_classes) {
if ($context->isPhantomClass($fq_class_name)) {
return null;
}
if (ClassLikeChecker::checkFullyQualifiedClassLikeName(
$project_checker,
$fq_class_name,
new CodeLocation($statements_checker->getSource(), $stmt->class),
$statements_checker->getSuppressedIssues()
) === false) {
return false;
}
}
} else {
switch ($stmt->class->parts[0]) {
case 'self':
$fq_class_name = $context->self;
break;
case 'parent':
$fq_class_name = $context->parent;
break;
case 'static':
// @todo maybe we can do better here
$fq_class_name = $context->self;
$late_static = true;
break;
}
}
} elseif ($stmt->class instanceof PhpParser\Node\Stmt\Class_) {
$statements_checker->analyze([$stmt->class], $context);
$fq_class_name = ClassChecker::getAnonymousClassName($stmt->class, $statements_checker->getFilePath());
} else {
ExpressionChecker::analyze($statements_checker, $stmt->class, $context);
}
if ($fq_class_name) {
$stmt->inferredType = new Type\Union([new TNamedObject($fq_class_name)]);
if (strtolower($fq_class_name) !== 'stdclass' &&
$context->check_classes &&
ClassChecker::classExists($project_checker, $fq_class_name)
) {
$storage = $project_checker->classlike_storage_provider->get($fq_class_name);
// if we're not calling this constructor via new static()
if ($storage->abstract && !$late_static) {
if (IssueBuffer::accepts(
new AbstractInstantiation(
'Unable to instantiate a abstract class ' . $fq_class_name,
new CodeLocation($statements_checker->getSource(), $stmt)
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
}
if ($storage->deprecated) {
if (IssueBuffer::accepts(
new DeprecatedClass(
$fq_class_name . ' is marked deprecated',
new CodeLocation($statements_checker->getSource(), $stmt)
),
$statements_checker->getSuppressedIssues()
)) {
// fall through
}
}
if (MethodChecker::methodExists(
$project_checker,
$fq_class_name . '::__construct',
$context->collect_references ? new CodeLocation($statements_checker->getSource(), $stmt) : null
)) {
$method_id = $fq_class_name . '::__construct';
if (self::checkMethodArgs(
$method_id,
$stmt->args,
$found_generic_params,
$context,
new CodeLocation($statements_checker->getSource(), $stmt),
$statements_checker
) === false) {
return false;
}
if (MethodChecker::checkMethodVisibility(
$method_id,
$context->self,
$statements_checker->getSource(),
new CodeLocation($statements_checker->getSource(), $stmt),
$statements_checker->getSuppressedIssues()
) === false) {
return false;
}
$generic_params = null;
if ($storage->template_types) {
foreach ($storage->template_types as $template_name => $_) {
if (isset($found_generic_params[$template_name])) {
$generic_params[] = $found_generic_params[$template_name];
} else {
$generic_params[] = Type::getMixed();
}
}
}
if ($fq_class_name === 'ArrayIterator' && isset($stmt->args[0]->value->inferredType)) {
/** @var Type\Union */
$first_arg_type = $stmt->args[0]->value->inferredType;
if ($first_arg_type->hasGeneric()) {
$key_type = null;
$value_type = null;
foreach ($first_arg_type->types as $type) {
if ($type instanceof Type\Atomic\TArray) {
$first_type_param = count($type->type_params) ? $type->type_params[0] : null;
$last_type_param = $type->type_params[count($type->type_params) - 1];
if ($value_type === null) {
$value_type = clone $last_type_param;
} else {
$value_type = Type::combineUnionTypes($value_type, $last_type_param);
}
if (!$key_type || !$first_type_param) {
$key_type = $first_type_param ? clone $first_type_param : Type::getMixed();
} else {
$key_type = Type::combineUnionTypes($key_type, $first_type_param);
}
}
}
if ($key_type === null) {
throw new \UnexpectedValueException('$key_type cannot be null');
}
if ($value_type === null) {
throw new \UnexpectedValueException('$value_type cannot be null');
}
$stmt->inferredType = new Type\Union([
new Type\Atomic\TGenericObject(
$fq_class_name,
[
$key_type,
$value_type,
]
),
]);
}
} elseif ($generic_params) {
$stmt->inferredType = new Type\Union([
new Type\Atomic\TGenericObject(
$fq_class_name,
$generic_params
),
]);
}
} elseif ($stmt->args) {
if (IssueBuffer::accepts(
new TooManyArguments(
'Class ' . $fq_class_name . ' has no __construct, but arguments were passed',
new CodeLocation($statements_checker->getSource(), $stmt)
),
$statements_checker->getSuppressedIssues()
)) {
// fall through
}
}
}
}
$config = Config::getInstance();
if (!$config->remember_property_assignments_after_call && !$context->collect_initializations) {
$context->removeAllObjectVars();
}
return null;
}
/**
* @param StatementsChecker $statements_checker
* @param PhpParser\Node\Expr\MethodCall $stmt
* @param Context $context
*
* @return false|null
*/
public static function analyzeMethodCall(
StatementsChecker $statements_checker,
PhpParser\Node\Expr\MethodCall $stmt,
Context $context
) {
if (ExpressionChecker::analyze($statements_checker, $stmt->var, $context) === false) {
return false;
}
$class_type = null;
$method_id = null;
if ($stmt->var instanceof PhpParser\Node\Expr\Variable) {
if (is_string($stmt->var->name) && $stmt->var->name === 'this' && !$statements_checker->getClassName()) {
if (IssueBuffer::accepts(
new InvalidScope(
'Use of $this in non-class context',
new CodeLocation($statements_checker->getSource(), $stmt)
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
}
}
$var_id = ExpressionChecker::getVarId(
$stmt->var,
$statements_checker->getFQCLN(),
$statements_checker
);
$class_type = $context->hasVariable($var_id) ? $context->vars_in_scope[$var_id] : null;
if (isset($stmt->var->inferredType)) {
/** @var Type\Union */
$class_type = $stmt->var->inferredType;
} elseif (!$class_type) {
$stmt->inferredType = Type::getMixed();
}
$source = $statements_checker->getSource();
if (!$context->check_methods || !$context->check_classes) {
return null;
}
$has_mock = false;
if ($class_type && is_string($stmt->name) && $class_type->isNull()) {
if (IssueBuffer::accepts(
new NullReference(
'Cannot call method ' . $stmt->name . ' on null variable ' . $var_id,
new CodeLocation($statements_checker->getSource(), $stmt->var)
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
return null;
}
if ($class_type &&
is_string($stmt->name) &&
$class_type->isNullable() &&
!$class_type->ignore_nullable_issues
) {
if (IssueBuffer::accepts(
new PossiblyNullReference(
'Cannot call method ' . $stmt->name . ' on possibly null variable ' . $var_id,
new CodeLocation($statements_checker->getSource(), $stmt->var)
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
}
if ($class_type &&
is_string($stmt->name) &&
$class_type->isFalsable()
) {
if (IssueBuffer::accepts(
new PossiblyFalseReference(
'Cannot call method ' . $stmt->name . ' on possibly false variable ' . $var_id,
new CodeLocation($statements_checker->getSource(), $stmt->var)
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
}
$config = Config::getInstance();
$project_checker = $statements_checker->getFileChecker()->project_checker;
$non_existent_method_ids = [];
$existent_method_ids = [];
$code_location = new CodeLocation($source, $stmt);
if ($class_type && is_string($stmt->name)) {
$return_type = null;
foreach ($class_type->types as $class_type_part) {
if (!$class_type_part instanceof TNamedObject) {
switch (get_class($class_type_part)) {
case 'Psalm\\Type\\Atomic\\TNull':
case 'Psalm\\Type\\Atomic\\TFalse':
// handled above
break;
case 'Psalm\\Type\\Atomic\\TInt':
case 'Psalm\\Type\\Atomic\\TBool':
case 'Psalm\\Type\\Atomic\\TArray':
case 'Psalm\\Type\\Atomic\\TString':
case 'Psalm\\Type\\Atomic\\TNumericString':
if (IssueBuffer::accepts(
new InvalidMethodCall(
'Cannot call method ' . $stmt->name . ' on ' . $class_type . ' variable ' . $var_id,
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
break;
case 'Psalm\\Type\\Atomic\\TMixed':
case 'Psalm\\Type\\Atomic\\TObject':
if (IssueBuffer::accepts(
new MixedMethodCall(
'Cannot call method ' . $stmt->name . ' on a mixed variable ' . $var_id,
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
break;
}
continue;
}
$fq_class_name = $class_type_part->value;
$intersection_types = $class_type_part->getIntersectionTypes();
$is_mock = ExpressionChecker::isMock($fq_class_name);
$has_mock = $has_mock || $is_mock;
if ($fq_class_name === 'static') {
$fq_class_name = (string) $context->self;
}
if ($is_mock ||
$context->isPhantomClass($fq_class_name)
) {
$return_type = Type::getMixed();
continue;
}
if ($var_id === '$this') {
$does_class_exist = true;
} else {
$does_class_exist = ClassLikeChecker::checkFullyQualifiedClassLikeName(
$project_checker,
$fq_class_name,
$code_location,
$statements_checker->getSuppressedIssues()
);
}
if (!$does_class_exist) {
return $does_class_exist;
}
if ($fq_class_name === 'iterable') {
if (IssueBuffer::accepts(
new UndefinedMethod(
$fq_class_name . ' has no defined methods',
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
return;
}
$method_id = $fq_class_name . '::' . strtolower($stmt->name);
if (MethodChecker::methodExists(
$project_checker,
$fq_class_name . '::__call'
)
) {
if (!MethodChecker::methodExists($project_checker, $method_id)
|| !MethodChecker::isMethodVisible(
$method_id,
$context->self,
$statements_checker->getSource()
)
) {
$return_type = Type::getMixed();
continue;
}
}
if ($var_id === '$this' &&
$context->self &&
$fq_class_name !== $context->self &&
MethodChecker::methodExists($project_checker, $context->self . '::' . strtolower($stmt->name))
) {
$method_id = $context->self . '::' . strtolower($stmt->name);
$fq_class_name = $context->self;
}
if ($intersection_types && !MethodChecker::methodExists($project_checker, $method_id)) {
foreach ($intersection_types as $intersection_type) {
$method_id = $intersection_type->value . '::' . strtolower($stmt->name);
$fq_class_name = $intersection_type->value;
if (MethodChecker::methodExists($project_checker, $method_id)) {
break;
}
}
}
$cased_method_id = $fq_class_name . '::' . $stmt->name;
if (!MethodChecker::methodExists($project_checker, $method_id, $code_location)) {
$non_existent_method_ids[] = $method_id;
continue;
}
$existent_method_ids[] = $method_id;
$class_template_params = null;
if ($stmt->var instanceof PhpParser\Node\Expr\Variable &&
($context->collect_initializations || $context->collect_mutations) &&
$stmt->var->name === 'this' &&
is_string($stmt->name) &&
$source instanceof FunctionLikeChecker
) {
self::collectSpecialInformation($source, $stmt->name, $context);
}
$class_storage = $project_checker->classlike_storage_provider->get($fq_class_name);
if ($class_storage->template_types) {
$class_template_params = [];
if ($class_type_part instanceof TGenericObject) {
$reversed_class_template_types = array_reverse(array_keys($class_storage->template_types));
$provided_type_param_count = count($class_type_part->type_params);
foreach ($reversed_class_template_types as $i => $type_name) {
if (isset($class_type_part->type_params[$provided_type_param_count - 1 - $i])) {
$class_template_params[$type_name] =
$class_type_part->type_params[$provided_type_param_count - 1 - $i];
} else {
$class_template_params[$type_name] = Type::getMixed();
}
}
} else {
foreach ($class_storage->template_types as $type_name => $_) {
$class_template_params[$type_name] = Type::getMixed();
}
}
}
if (self::checkMethodArgs(
$method_id,
$stmt->args,
$class_template_params,
$context,
$code_location,
$statements_checker
) === false) {
return false;
}
$return_type_location = null;
$project_checker = $source->getFileChecker()->project_checker;
if (FunctionChecker::inCallMap($cased_method_id)) {
$return_type_candidate = FunctionChecker::getReturnTypeFromCallMap($method_id);
} else {
if (MethodChecker::checkMethodVisibility(
$method_id,
$context->self,
$statements_checker->getSource(),
$code_location,
$statements_checker->getSuppressedIssues()
) === false) {
return false;
}
if (MethodChecker::checkMethodNotDeprecated(
$project_checker,
$method_id,
$code_location,
$statements_checker->getSuppressedIssues()
) === false) {
return false;
}
$return_type_candidate = MethodChecker::getMethodReturnType($project_checker, $method_id);
if ($return_type_candidate) {
if ($class_template_params) {
$return_type_candidate = FunctionChecker::replaceTemplateTypes(
$return_type_candidate,
$class_template_params
);
} else {
$return_type_candidate = clone $return_type_candidate;
}
$return_type_candidate = ExpressionChecker::fleshOutType(
$project_checker,
$return_type_candidate,
$fq_class_name,
$method_id
);
$return_type_location = MethodChecker::getMethodReturnTypeLocation(
$project_checker,
$method_id,
$secondary_return_type_location
);
if ($secondary_return_type_location) {
$return_type_location = $secondary_return_type_location;
}
// only check the type locally if it's defined externally
if ($return_type_location && !$config->isInProjectDirs($return_type_location->file_path)) {
$return_type_candidate->check(
$statements_checker,
new CodeLocation($source, $stmt),
$statements_checker->getSuppressedIssues(),
$context->getPhantomClasses()
);
}
}
}
if ($return_type_candidate) {
if (!$return_type) {
$return_type = $return_type_candidate;
} else {
$return_type = Type::combineUnionTypes($return_type_candidate, $return_type);
}
} else {
$return_type = Type::getMixed();
}
}
if ($non_existent_method_ids) {
if ($existent_method_ids) {
if (IssueBuffer::accepts(
new PossiblyUndefinedMethod(
'Method ' . $non_existent_method_ids[0] . ' does not exist',
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
} else {
if (IssueBuffer::accepts(
new UndefinedMethod(
'Method ' . $non_existent_method_ids[0] . ' does not exist',
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
}
return null;
}
$stmt->inferredType = $return_type;
}
if ($method_id === null) {
return self::checkMethodArgs(
$method_id,
$stmt->args,
$found_generic_params,
$context,
new CodeLocation($statements_checker->getSource(), $stmt),
$statements_checker
);
}
if (!$config->remember_property_assignments_after_call && !$context->collect_initializations) {
$context->removeAllObjectVars();
}
}
/**
* @param FunctionLikeChecker $source
* @param string $method_name
* @param Context $context
*
* @return void
*/
public static function collectSpecialInformation(
FunctionLikeChecker $source,
$method_name,
Context $context
) {
$fq_class_name = (string)$source->getFQCLN();
$project_checker = $source->getFileChecker()->project_checker;
if ($context->collect_mutations &&
$context->self &&
(
$context->self === $fq_class_name ||
ClassChecker::classExtends(
$project_checker,
$context->self,
$fq_class_name
)
)
) {
$method_id = $fq_class_name . '::' . strtolower($method_name);
$project_checker->getMethodMutations($method_id, $context);
} elseif ($context->collect_initializations &&
$context->self &&
(
$context->self === $fq_class_name ||
ClassChecker::classExtends(
$project_checker,
$context->self,
$fq_class_name
)
) &&
$source->getMethodName() !== $method_name
) {
$method_id = $fq_class_name . '::' . strtolower($method_name);
$declaring_method_id = MethodChecker::getDeclaringMethodId($project_checker, $method_id);
$method_storage = MethodChecker::getStorage($project_checker, (string)$declaring_method_id);
$class_checker = $source->getSource();
if ($class_checker instanceof ClassLikeChecker &&
$method_storage->visibility === ClassLikeChecker::VISIBILITY_PRIVATE
) {
$local_vars_in_scope = [];
$local_vars_possibly_in_scope = [];
foreach ($context->vars_in_scope as $var => $type) {
if (strpos($var, '$this->') !== 0 && $var !== '$this') {
$local_vars_in_scope[$var] = $context->vars_in_scope[$var];
}
}
foreach ($context->vars_possibly_in_scope as $var => $type) {
if (strpos($var, '$this->') !== 0 && $var !== '$this') {
$local_vars_possibly_in_scope[$var] = $context->vars_possibly_in_scope[$var];
}
}
$class_checker->getMethodMutations(strtolower($method_name), $context);
foreach ($local_vars_in_scope as $var => $type) {
$context->vars_in_scope[$var] = $type;
}
foreach ($local_vars_possibly_in_scope as $var => $type) {
$context->vars_possibly_in_scope[$var] = $type;
}
}
}
}
/**
* @param StatementsChecker $statements_checker
* @param PhpParser\Node\Expr\StaticCall $stmt
* @param Context $context
*
* @return false|null
*/
public static function analyzeStaticCall(
StatementsChecker $statements_checker,
PhpParser\Node\Expr\StaticCall $stmt,
Context $context
) {
$method_id = null;
$fq_class_name = null;
$lhs_type = null;
$file_checker = $statements_checker->getFileChecker();
$project_checker = $file_checker->project_checker;
$source = $statements_checker->getSource();
if ($stmt->class instanceof PhpParser\Node\Name) {
$fq_class_name = null;
if (count($stmt->class->parts) === 1
&& in_array(strtolower($stmt->class->parts[0]), ['self', 'static', 'parent'], true)
) {
if ($stmt->class->parts[0] === 'parent') {
$fq_class_name = $statements_checker->getParentFQCLN();
if ($fq_class_name === null) {
if (IssueBuffer::accepts(
new ParentNotFound(
'Cannot call method on parent as this class does not extend another',
new CodeLocation($statements_checker->getSource(), $stmt)
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
return;
}
$class_storage = $project_checker->classlike_storage_provider->get($fq_class_name);
if (is_string($stmt->name) && $class_storage->user_defined) {
$method_id = $fq_class_name . '::' . strtolower($stmt->name);
$old_context_include_location = $context->include_location;
$old_self = $context->self;
$context->include_location = new CodeLocation($statements_checker->getSource(), $stmt);
$context->self = $fq_class_name;
if ($context->collect_mutations) {
$file_checker->getMethodMutations($method_id, $context);
} elseif ($context->collect_initializations) {
$local_vars_in_scope = [];
$local_vars_possibly_in_scope = [];
foreach ($context->vars_in_scope as $var => $type) {
if (strpos($var, '$this->') !== 0 && $var !== '$this') {
$local_vars_in_scope[$var] = $context->vars_in_scope[$var];
}
}
foreach ($context->vars_possibly_in_scope as $var => $type) {
if (strpos($var, '$this->') !== 0 && $var !== '$this') {
$local_vars_possibly_in_scope[$var] = $context->vars_possibly_in_scope[$var];
}
}
$file_checker->getMethodMutations($method_id, $context);
foreach ($local_vars_in_scope as $var => $type) {
$context->vars_in_scope[$var] = $type;
}
foreach ($local_vars_possibly_in_scope as $var => $type) {
$context->vars_possibly_in_scope[$var] = $type;
}
}
$context->include_location = $old_context_include_location;
$context->self = $old_self;
}
} else {
$namespace = $statements_checker->getNamespace()
? $statements_checker->getNamespace() . '\\'
: '';
$fq_class_name = $context->self ?: $namespace . $statements_checker->getClassName();
}
if ($context->isPhantomClass($fq_class_name)) {
return null;
}
} elseif ($context->check_classes) {
$fq_class_name = ClassLikeChecker::getFQCLNFromNameObject(
$stmt->class,
$statements_checker->getAliases()
);
if ($context->isPhantomClass($fq_class_name)) {
return null;
}
$does_class_exist = false;
if ($context->self) {
$self_storage = $project_checker->classlike_storage_provider->get($context->self);
if (isset($self_storage->used_traits[strtolower($fq_class_name)])) {
$fq_class_name = $context->self;
$does_class_exist = true;
}
}
if (!$does_class_exist) {
$does_class_exist = ClassLikeChecker::checkFullyQualifiedClassLikeName(
$project_checker,
$fq_class_name,
new CodeLocation($source, $stmt->class),
$statements_checker->getSuppressedIssues(),
false
);
}
if (!$does_class_exist) {
return $does_class_exist;
}
}
if ($fq_class_name) {
$lhs_type = new Type\Union([new TNamedObject($fq_class_name)]);
}
} else {
ExpressionChecker::analyze($statements_checker, $stmt->class, $context);
/** @var Type\Union */
$lhs_type = $stmt->class->inferredType;
if (!isset($lhs_type) || $lhs_type->hasString()) {
return null;
}
}
if (!$context->check_methods || !$lhs_type) {
return null;
}
$has_mock = false;
$config = Config::getInstance();
foreach ($lhs_type->types as $lhs_type_part) {
if (!$lhs_type_part instanceof TNamedObject) {
// @todo deal with it
continue;
}
$fq_class_name = $lhs_type_part->value;
$is_mock = ExpressionChecker::isMock($fq_class_name);
$has_mock = $has_mock || $is_mock;
$method_id = null;
if (is_string($stmt->name) &&
!MethodChecker::methodExists($project_checker, $fq_class_name . '::__callStatic') &&
!$is_mock
) {
$method_id = $fq_class_name . '::' . strtolower($stmt->name);
$cased_method_id = $fq_class_name . '::' . $stmt->name;
$does_method_exist = MethodChecker::checkMethodExists(
$project_checker,
$cased_method_id,
new CodeLocation($source, $stmt),
$statements_checker->getSuppressedIssues()
);
if (!$does_method_exist) {
return $does_method_exist;
}
$class_storage = $project_checker->classlike_storage_provider->get($fq_class_name);
if ($class_storage->deprecated) {
if (IssueBuffer::accepts(
new DeprecatedClass(
$fq_class_name . ' is marked deprecated',
new CodeLocation($statements_checker->getSource(), $stmt)
),
$statements_checker->getSuppressedIssues()
)) {
// fall through
}
}
if (MethodChecker::checkMethodVisibility(
$method_id,
$context->self,
$statements_checker->getSource(),
new CodeLocation($source, $stmt),
$statements_checker->getSuppressedIssues()
) === false) {
return false;
}
if ($stmt->class instanceof PhpParser\Node\Name
&& ($stmt->class->parts[0] !== 'parent' || $statements_checker->isStatic())
&& (!$context->self
|| $statements_checker->isStatic()
|| !ClassChecker::classExtends($project_checker, $context->self, $fq_class_name)
)
) {
if (MethodChecker::checkStatic(
$method_id,
$stmt->class instanceof PhpParser\Node\Name && strtolower($stmt->class->parts[0]) === 'self',
$project_checker,
new CodeLocation($source, $stmt),
$statements_checker->getSuppressedIssues()
) === false) {
// fall through
}
}
if (MethodChecker::checkMethodNotDeprecated(
$project_checker,
$method_id,
new CodeLocation($statements_checker->getSource(), $stmt),
$statements_checker->getSuppressedIssues()
) === false) {
// fall through
}
if (self::checkMethodArgs(
$method_id,
$stmt->args,
$found_generic_params,
$context,
new CodeLocation($statements_checker->getSource(), $stmt),
$statements_checker
) === false) {
return false;
}
$fq_class_name = $stmt->class instanceof PhpParser\Node\Name && $stmt->class->parts === ['parent']
? $statements_checker->getFQCLN()
: $fq_class_name;
$return_type_candidate = MethodChecker::getMethodReturnType($project_checker, $method_id);
if ($return_type_candidate) {
if ($found_generic_params) {
$return_type_candidate = FunctionChecker::replaceTemplateTypes(
$return_type_candidate,
$found_generic_params
);
} else {
$return_type_candidate = clone $return_type_candidate;
}
$return_type_candidate = ExpressionChecker::fleshOutType(
$project_checker,
$return_type_candidate,
$fq_class_name,
$method_id
);
$return_type_location = MethodChecker::getMethodReturnTypeLocation(
$project_checker,
$method_id,
$secondary_return_type_location
);
if ($secondary_return_type_location) {
$return_type_location = $secondary_return_type_location;
}
// only check the type locally if it's defined externally
if ($return_type_location && !$config->isInProjectDirs($return_type_location->file_path)) {
$return_type_candidate->check(
$statements_checker,
new CodeLocation($source, $stmt),
$statements_checker->getSuppressedIssues(),
$context->getPhantomClasses()
);
}
}
if ($return_type_candidate) {
if (isset($stmt->inferredType)) {
$stmt->inferredType = Type::combineUnionTypes($stmt->inferredType, $return_type_candidate);
} else {
$stmt->inferredType = $return_type_candidate;
}
}
}
}
if ($method_id === null) {
return self::checkMethodArgs(
$method_id,
$stmt->args,
$found_generic_params,
$context,
new CodeLocation($statements_checker->getSource(), $stmt),
$statements_checker
);
}
if (!$config->remember_property_assignments_after_call && !$context->collect_initializations) {
$context->removeAllObjectVars();
}
}
/**
* @param string|null $method_id
* @param array<int, PhpParser\Node\Arg> $args
* @param array<string, Type\Union>|null &$generic_params
* @param Context $context
* @param CodeLocation $code_location
* @param StatementsChecker $statements_checker
*
* @return false|null
*/
protected static function checkMethodArgs(
$method_id,
array $args,
&$generic_params,
Context $context,
CodeLocation $code_location,
StatementsChecker $statements_checker
) {
$project_checker = $statements_checker->getFileChecker()->project_checker;
$method_params = $method_id
? FunctionLikeChecker::getMethodParamsById($project_checker, $method_id, $args)
: null;
if (self::checkFunctionArguments(
$statements_checker,
$args,
$method_params,
$method_id,
$context
) === false) {
return false;
}
if (!$method_id || $method_params === null) {
return;
}
list($fq_class_name, $method_name) = explode('::', $method_id);
$class_storage = $project_checker->classlike_storage_provider->get($fq_class_name);
$method_storage = null;
if (isset($class_storage->declaring_method_ids[strtolower($method_name)])) {
$declaring_method_id = $class_storage->declaring_method_ids[strtolower($method_name)];
list($declaring_fq_class_name, $declaring_method_name) = explode('::', $declaring_method_id);
if ($declaring_fq_class_name !== $fq_class_name) {
$declaring_class_storage = $project_checker->classlike_storage_provider->get($declaring_fq_class_name);
} else {
$declaring_class_storage = $class_storage;
}
if (!isset($declaring_class_storage->methods[strtolower($declaring_method_name)])) {
throw new \UnexpectedValueException('Storage should not be empty here');
}
$method_storage = $declaring_class_storage->methods[strtolower($declaring_method_name)];
}
if (!$class_storage->user_defined) {
// check again after we've processed args
$method_params = FunctionLikeChecker::getMethodParamsById(
$project_checker,
$method_id,
$args
);
}
if (self::checkFunctionArgumentsMatch(
$statements_checker,
$args,
$method_id,
$method_params,
$method_storage,
$class_storage,
$generic_params,
$code_location,
$context
) === false) {
return false;
}
return null;
}
/**
* @param StatementsChecker $statements_checker
* @param array<int, PhpParser\Node\Arg> $args
* @param array<int, FunctionLikeParameter>|null $function_params
* @param string|null $method_id
* @param Context $context
*
* @return false|null
*/
protected static function checkFunctionArguments(
StatementsChecker $statements_checker,
array $args,
$function_params,
$method_id,
Context $context
) {
$last_param = $function_params
? $function_params[count($function_params) - 1]
: null;
// if this modifies the array type based on further args
if ($method_id && in_array($method_id, ['array_push', 'array_unshift'], true) && $function_params) {
$array_arg = $args[0]->value;
if (ExpressionChecker::analyze(
$statements_checker,
$array_arg,
$context
) === false) {
return false;
}
if (isset($array_arg->inferredType) && $array_arg->inferredType->hasArray()) {
/** @var TArray|ObjectLike */
$array_type = $array_arg->inferredType->types['array'];
if ($array_type instanceof ObjectLike) {
$array_type = new TArray([Type::getString(), $array_type->getGenericTypeParam()]);
}
$by_ref_type = new Type\Union([clone $array_type]);
foreach ($args as $argument_offset => $arg) {
if ($argument_offset === 0) {
continue;
}
if (ExpressionChecker::analyze(
$statements_checker,
$arg->value,
$context
) === false) {
return false;
}
$by_ref_type = Type::combineUnionTypes(
$by_ref_type,
$by_ref_type = new Type\Union(
[
new TArray(
[
Type::getInt(),
isset($arg->value->inferredType)
? clone $arg->value->inferredType
: Type::getMixed(),
]
),
]
)
);
}
ExpressionChecker::assignByRefParam(
$statements_checker,
$array_arg,
$by_ref_type,
$context,
false
);
}
return;
}
foreach ($args as $argument_offset => $arg) {
if ($function_params !== null) {
$by_ref = $argument_offset < count($function_params)
? $function_params[$argument_offset]->by_ref
: $last_param && $last_param->is_variadic && $last_param->by_ref;
$by_ref_type = null;
if ($by_ref && $last_param) {
if ($argument_offset < count($function_params)) {
$by_ref_type = $function_params[$argument_offset]->type;
} else {
$by_ref_type = $last_param->type;
}
$by_ref_type = $by_ref_type ? clone $by_ref_type : Type::getMixed();
}
if ($by_ref && $by_ref_type) {
// special handling for array sort
if ($argument_offset === 0
&& $method_id
&& in_array(
$method_id,
[
'shuffle', 'sort', 'rsort', 'usort', 'ksort', 'asort',
'krsort', 'arsort', 'natcasesort', 'natsort', 'reset',
'end', 'next', 'prev', 'array_pop', 'array_shift',
],
true
)
) {
if (ExpressionChecker::analyze(
$statements_checker,
$arg->value,
$context
) === false) {
return false;
}
// noops
if (in_array($method_id, ['reset', 'end', 'next', 'prev', 'array_pop', 'array_shift'], true)) {
continue;
}
if (isset($arg->value->inferredType)
&& $arg->value->inferredType->hasArray()
) {
/** @var TArray|ObjectLike */
$array_type = $arg->value->inferredType->types['array'];
if ($array_type instanceof ObjectLike) {
$array_type = new TArray([Type::getString(), $array_type->getGenericTypeParam()]);
}
if (in_array($method_id, ['shuffle', 'sort', 'rsort', 'usort'], true)) {
$tvalue = $array_type->type_params[1];
$by_ref_type = new Type\Union([new TArray([Type::getInt(), clone $tvalue])]);
} else {
$by_ref_type = new Type\Union([clone $array_type]);
}
ExpressionChecker::assignByRefParam(
$statements_checker,
$arg->value,
$by_ref_type,
$context,
false
);
continue;
}
}
if ($method_id === 'socket_select') {
if (ExpressionChecker::analyze(
$statements_checker,
$arg->value,
$context
) === false) {
return false;
}
continue;
}
ExpressionChecker::assignByRefParam(
$statements_checker,
$arg->value,
$by_ref_type,
$context,
$method_id && (strpos($method_id, '::') !== false || !FunctionChecker::inCallMap($method_id))
);
} else {
if ($arg->value instanceof PhpParser\Node\Expr\Variable) {
if (ExpressionChecker::analyzeVariable(
$statements_checker,
$arg->value,
$context,
$by_ref,
$by_ref_type
) === false) {
return false;
}
} elseif ($arg->value instanceof PhpParser\Node\Expr\PropertyFetch) {
if (FetchChecker::analyzePropertyFetch(
$statements_checker,
$arg->value,
$context
) === false
) {
return false;
}
} else {
if (ExpressionChecker::analyze($statements_checker, $arg->value, $context) === false) {
return false;
}
}
}
} else {
if ($arg->value instanceof PhpParser\Node\Expr\PropertyFetch && is_string($arg->value->name)) {
$var_id = '$' . $arg->value->name;
} else {
$var_id = ExpressionChecker::getVarId(
$arg->value,
$statements_checker->getFQCLN(),
$statements_checker
);
}
if ($var_id &&
(!$context->hasVariable($var_id) || $context->vars_in_scope[$var_id]->isNull())
) {
// we don't know if it exists, assume it's passed by reference
$context->vars_in_scope[$var_id] = Type::getMixed();
$context->vars_possibly_in_scope[$var_id] = true;
if (!$statements_checker->hasVariable($var_id)) {
$statements_checker->registerVariable(
$var_id,
new CodeLocation($statements_checker, $arg->value)
);
}
}
}
}
return null;
}
/**
* @param StatementsChecker $statements_checker
* @param array<int, PhpParser\Node\Arg> $args
* @param string|null $method_id
* @param array<int,FunctionLikeParameter> $function_params
* @param FunctionLikeStorage|null $function_storage
* @param ClassLikeStorage|null $class_storage
* @param array<string, Type\Union>|null $generic_params
* @param CodeLocation $code_location
* @param Context $context
*
* @return false|null
*/
protected static function checkFunctionArgumentsMatch(
StatementsChecker $statements_checker,
array $args,
$method_id,
array $function_params,
$function_storage,
$class_storage,
&$generic_params,
CodeLocation $code_location,
Context $context
) {
$in_call_map = $method_id ? FunctionChecker::inCallMap($method_id) : false;
$cased_method_id = $method_id;
$is_variadic = false;
$fq_class_name = null;
$project_checker = $statements_checker->getFileChecker()->project_checker;
if ($method_id) {
if ($in_call_map || !strpos($method_id, '::')) {
$is_variadic = FunctionChecker::isVariadic(
$project_checker,
strtolower($method_id),
$statements_checker->getFilePath()
);
} else {
$fq_class_name = explode('::', $method_id)[0];
$is_variadic = MethodChecker::isVariadic($project_checker, $method_id);
}
}
if ($method_id && strpos($method_id, '::') && !$in_call_map) {
$cased_method_id = MethodChecker::getCasedMethodId($project_checker, $method_id);
}
if ($function_params) {
foreach ($function_params as $function_param) {
$is_variadic = $is_variadic || $function_param->is_variadic;
}
}
$has_packed_var = false;
foreach ($args as $arg) {
$has_packed_var = $has_packed_var || $arg->unpack;
}
$last_param = $function_params
? $function_params[count($function_params) - 1]
: null;
$template_types = null;
if ($function_storage) {
$template_types = [];
if ($function_storage->template_types) {
$template_types = $function_storage->template_types;
}
if ($class_storage && $class_storage->template_types) {
$template_types = array_merge($template_types, $class_storage->template_types);
}
}
foreach ($args as $argument_offset => $arg) {
$function_param = count($function_params) > $argument_offset
? $function_params[$argument_offset]
: ($last_param && $last_param->is_variadic ? $last_param : null);
if ($function_param
&& $function_param->by_ref
&& ($arg->value instanceof PhpParser\Node\Scalar
|| $arg->value instanceof PhpParser\Node\Expr\ClassConstFetch
|| $arg->value instanceof PhpParser\Node\Expr\ConstFetch
|| $arg->value instanceof PhpParser\Node\Expr\FuncCall
|| $arg->value instanceof PhpParser\Node\Expr\MethodCall
)
) {
if (IssueBuffer::accepts(
new InvalidPassByReference(
'Parameter ' . ($argument_offset + 1) . ' of ' . $method_id . ' expects a variable',
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
break;
}
if (isset($arg->value->inferredType)) {
if ($function_param && $function_param->type) {
$param_type = clone $function_param->type;
if ($function_param->is_variadic) {
if (!$param_type->hasArray() || !$param_type->types['array'] instanceof TArray) {
break;
}
$param_type = clone $param_type->types['array']->type_params[1];
}
if ($function_storage) {
if (isset($function_storage->template_typeof_params[$argument_offset])) {
$template_type = $function_storage->template_typeof_params[$argument_offset];
$offset_value_type = null;
if ($arg->value instanceof PhpParser\Node\Expr\ClassConstFetch &&
$arg->value->class instanceof PhpParser\Node\Name &&
is_string($arg->value->name) &&
strtolower($arg->value->name) === 'class'
) {
$offset_value_type = Type::parseString(
ClassLikeChecker::getFQCLNFromNameObject(
$arg->value->class,
$statements_checker->getAliases()
)
);
} elseif ($arg->value instanceof PhpParser\Node\Scalar\String_ && $arg->value->value) {
$offset_value_type = Type::parseString($arg->value->value);
}
if ($offset_value_type) {
foreach ($offset_value_type->types as $offset_value_type_part) {
// register class if the class exists
if ($offset_value_type_part instanceof TNamedObject) {
ClassLikeChecker::checkFullyQualifiedClassLikeName(
$project_checker,
$offset_value_type_part->value,
new CodeLocation($statements_checker->getSource(), $arg->value),
$statements_checker->getSuppressedIssues()
);
}
}
}
if ($generic_params === null) {
$generic_params = [];
}
$generic_params[$template_type] = $offset_value_type ?: Type::getMixed();
} elseif ($template_types) {
if ($generic_params === null) {
$generic_params = [];
}
$param_type->replaceTemplateTypes(
$template_types,
$generic_params,
$arg->value->inferredType
);
}
}
// for now stop when we encounter a packed argument
if ($arg->unpack) {
break;
}
$fleshed_out_type = ExpressionChecker::fleshOutType(
$project_checker,
$param_type,
$fq_class_name,
$method_id
);
if ($context->check_variables) {
if (self::checkFunctionArgumentType(
$statements_checker,
$arg->value->inferredType,
$fleshed_out_type,
$cased_method_id,
$argument_offset,
new CodeLocation($statements_checker->getSource(), $arg->value),
$arg->value,
$context
) === false) {
return false;
}
}
}
}
}
if ($method_id === 'array_map' || $method_id === 'array_filter') {
if ($method_id === 'array_map' && count($args) < 2) {
if (IssueBuffer::accepts(
new TooFewArguments(
'Too few arguments for ' . $method_id,
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
} elseif ($method_id === 'array_filter' && count($args) < 1) {
if (IssueBuffer::accepts(
new TooFewArguments(
'Too few arguments for ' . $method_id,
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
}
if (self::checkArrayFunctionArgumentsMatch(
$statements_checker,
$args,
$method_id
) === false
) {
return false;
}
}
if (!$is_variadic
&& count($args) > count($function_params)
&& (!count($function_params) || $function_params[count($function_params) - 1]->name !== '...=')
) {
if (IssueBuffer::accepts(
new TooManyArguments(
'Too many arguments for method ' . ($cased_method_id ?: $method_id),
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
// fall through
}
return null;
}
if (!$has_packed_var && count($args) < count($function_params)) {
for ($i = count($args); $i < count($function_params); ++$i) {
$param = $function_params[$i];
if (!$param->is_optional && !$param->is_variadic) {
if (IssueBuffer::accepts(
new TooFewArguments(
'Too few arguments for method ' . $cased_method_id,
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
break;
}
}
}
}
/**
* @param StatementsChecker $statements_checker
* @param array<int, PhpParser\Node\Arg> $args
* @param string|null $method_id
*
* @return false|null
*/
protected static function checkArrayFunctionArgumentsMatch(
StatementsChecker $statements_checker,
array $args,
$method_id
) {
$closure_index = $method_id === 'array_map' ? 0 : 1;
$array_arg_types = [];
foreach ($args as $i => $arg) {
if ($i === 0 && $method_id === 'array_map') {
continue;
}
if ($i === 1 && $method_id === 'array_filter') {
break;
}
$array_arg = isset($arg->value) ? $arg->value : null;
/** @var ObjectLike|TArray|null */
$array_arg_type = $array_arg
&& isset($array_arg->inferredType)
&& isset($array_arg->inferredType->types['array'])
? $array_arg->inferredType->types['array']
: null;
if ($array_arg_type instanceof ObjectLike) {
$array_arg_type = new TArray([Type::getString(), $array_arg_type->getGenericTypeParam()]);
}
$array_arg_types[] = $array_arg_type;
}
/** @var PhpParser\Node\Arg */
$closure_arg = isset($args[$closure_index]) ? $args[$closure_index] : null;
/** @var Type\Union|null */
$closure_arg_type = $closure_arg && isset($closure_arg->value->inferredType)
? $closure_arg->value->inferredType
: null;
$file_checker = $statements_checker->getFileChecker();
$project_checker = $file_checker->project_checker;
if ($closure_arg_type) {
$min_closure_param_count = $max_closure_param_count = count($array_arg_types);
if ($method_id === 'array_filter') {
$max_closure_param_count = count($args) > 2 ? 2 : 1;
}
foreach ($closure_arg_type->types as $closure_type) {
if (!$closure_type instanceof Type\Atomic\Fn) {
continue;
}
if (count($closure_type->params) > $max_closure_param_count) {
if (IssueBuffer::accepts(
new TooManyArguments(
'Too many arguments in closure for ' . $method_id,
new CodeLocation($statements_checker->getSource(), $closure_arg)
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
} elseif (count($closure_type->params) < $min_closure_param_count) {
if (IssueBuffer::accepts(
new TooFewArguments(
'You must supply a param in the closure for ' . $method_id,
new CodeLocation($statements_checker->getSource(), $closure_arg)
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
}
// abandon attempt to validate closure params if we have an extra arg for ARRAY_FILTER
if ($method_id === 'array_filter' && count($args) > 2) {
continue;
}
$closure_params = $closure_type->params;
$i = 0;
foreach ($closure_params as $closure_param) {
if (!isset($array_arg_types[$i])) {
++$i;
continue;
}
/** @var Type\Atomic\TArray */
$array_arg_type = $array_arg_types[$i];
$input_type = $array_arg_type->type_params[1];
if ($input_type->isMixed()) {
++$i;
continue;
}
$closure_param_type = $closure_param->type;
if (!$closure_param_type) {
++$i;
continue;
}
$type_match_found = TypeChecker::isContainedBy(
$project_checker,
$input_type,
$closure_param_type,
false,
false,
$scalar_type_match_found,
$coerced_type
);
if ($coerced_type) {
if (IssueBuffer::accepts(
new TypeCoercion(
'First parameter of closure passed to function ' . $method_id . ' expects ' .
$closure_param_type . ', parent type ' . $input_type . ' provided',
new CodeLocation($statements_checker->getSource(), $closure_arg)
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
}
if (!$type_match_found) {
$types_can_be_identical = TypeChecker::canBeIdenticalTo(
$project_checker,
$input_type,
$closure_param_type
);
if ($scalar_type_match_found) {
if (IssueBuffer::accepts(
new InvalidScalarArgument(
'First parameter of closure passed to function ' . $method_id . ' expects ' .
$closure_param_type . ', ' . $input_type . ' provided',
new CodeLocation($statements_checker->getSource(), $closure_arg)
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
} elseif ($types_can_be_identical) {
if (IssueBuffer::accepts(
new PossiblyInvalidArgument(
'First parameter of closure passed to function ' . $method_id . ' expects ' .
$closure_param_type . ', possibly different type ' . $input_type . ' provided',
new CodeLocation($statements_checker->getSource(), $closure_arg)
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
} elseif (IssueBuffer::accepts(
new InvalidArgument(
'First parameter of closure passed to function ' . $method_id . ' expects ' .
$closure_param_type . ', ' . $input_type . ' provided',
new CodeLocation($statements_checker->getSource(), $closure_arg)
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
}
++$i;
}
}
}
}
/**
* @param StatementsChecker $statements_checker
* @param Type\Union $input_type
* @param Type\Union $param_type
* @param string|null $cased_method_id
* @param int $argument_offset
* @param CodeLocation $code_location
*
* @return null|false
*/
public static function checkFunctionArgumentType(
StatementsChecker $statements_checker,
Type\Union $input_type,
Type\Union $param_type,
$cased_method_id,
$argument_offset,
CodeLocation $code_location,
PhpParser\Node\Expr $input_expr = null,
Context $context = null
) {
if ($param_type->isMixed()) {
return null;
}
$project_checker = $statements_checker->getFileChecker()->project_checker;
$method_identifier = $cased_method_id ? ' of ' . $cased_method_id : '';
if ($project_checker->infer_types_from_usage
&& $context
&& $input_expr
&& $input_expr->inferredType
) {
$source_checker = $statements_checker->getSource();
if ($source_checker instanceof FunctionLikeChecker) {
$context->inferType($input_expr, $source_checker->getFunctionLikeStorage(), $param_type);
}
}
if ($input_type->isMixed()) {
if (IssueBuffer::accepts(
new MixedArgument(
'Argument ' . ($argument_offset + 1) . $method_identifier . ' cannot be mixed, expecting ' .
$param_type,
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
return null;
}
if (!$param_type->isNullable() && $cased_method_id !== 'echo') {
if ($input_type->isNull()) {
if (IssueBuffer::accepts(
new NullArgument(
'Argument ' . ($argument_offset + 1) . $method_identifier . ' cannot be null, ' .
'null value provided',
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
return null;
}
if ($input_type->isNullable() && !$input_type->ignore_nullable_issues) {
if (IssueBuffer::accepts(
new PossiblyNullArgument(
'Argument ' . ($argument_offset + 1) . $method_identifier . ' cannot be null, possibly ' .
'null value provided',
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
}
}
if ($input_type->isFalsable() && !$param_type->hasBool()) {
if (IssueBuffer::accepts(
new PossiblyFalseArgument(
'Argument ' . ($argument_offset + 1) . $method_identifier . ' cannot be false, possibly ' .
'false value provided',
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
}
$param_type = TypeChecker::simplifyUnionType(
$project_checker,
$param_type
);
$type_match_found = TypeChecker::isContainedBy(
$project_checker,
$input_type,
$param_type,
true,
true,
$scalar_type_match_found,
$coerced_type,
$to_string_cast
);
if ($coerced_type) {
if (IssueBuffer::accepts(
new TypeCoercion(
'Argument ' . ($argument_offset + 1) . $method_identifier . ' expects ' . $param_type .
', parent type ' . $input_type . ' provided',
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
}
if ($to_string_cast && $cased_method_id !== 'echo') {
if (IssueBuffer::accepts(
new ImplicitToStringCast(
'Argument ' . ($argument_offset + 1) . $method_identifier . ' expects ' .
$param_type . ', ' . $input_type . ' provided with a __toString method',
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
// fall through
}
}
if (!$type_match_found && !$coerced_type) {
$types_can_be_identical = TypeChecker::canBeIdenticalTo(
$project_checker,
$param_type,
$input_type
);
if ($scalar_type_match_found) {
if ($cased_method_id !== 'echo') {
if (IssueBuffer::accepts(
new InvalidScalarArgument(
'Argument ' . ($argument_offset + 1) . $method_identifier . ' expects ' .
$param_type . ', ' . $input_type . ' provided',
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
}
} elseif ($types_can_be_identical) {
if (IssueBuffer::accepts(
new PossiblyInvalidArgument(
'Argument ' . ($argument_offset + 1) . $method_identifier . ' expects ' . $param_type .
', possibly different type ' . $input_type . ' provided',
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
} elseif (IssueBuffer::accepts(
new InvalidArgument(
'Argument ' . ($argument_offset + 1) . $method_identifier . ' expects ' . $param_type .
', ' . $input_type . ' provided',
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
return false;
}
} elseif ($input_expr instanceof PhpParser\Node\Scalar\String_
|| $input_expr instanceof PhpParser\Node\Expr\Array_
) {
foreach ($param_type->types as $param_type_part) {
if ($param_type_part instanceof TCallable) {
$function_ids = self::getFunctionIdsFromCallableArg(
$statements_checker,
$input_expr
);
foreach ($function_ids as $function_id) {
if (strpos($function_id, '::') !== false) {
list($callable_fq_class_name) = explode('::', $function_id);
if (!in_array(strtolower($callable_fq_class_name), ['self', 'static', 'parent'], true)) {
if (ClassLikeChecker::checkFullyQualifiedClassLikeName(
$project_checker,
$callable_fq_class_name,
$code_location,
$statements_checker->getSuppressedIssues()
) === false
) {
return false;
}
if (MethodChecker::checkMethodExists(
$project_checker,
$function_id,
$code_location,
$statements_checker->getSuppressedIssues()
) === false
) {
return false;
}
}
} else {
if (self::checkFunctionExists(
$statements_checker,
$function_id,
$code_location
) === false
) {
return false;
}
}
}
}
}
}
return null;
}
/**
* @param PhpParser\Node\Scalar\String_|PhpParser\Node\Expr\Array_ $callable_arg
*
* @return string[]
*/
public static function getFunctionIdsFromCallableArg(
StatementsChecker $statements_checker,
$callable_arg
) {
if ($callable_arg instanceof PhpParser\Node\Scalar\String_) {
return [preg_replace('/^\\\/', '', $callable_arg->value)];
}
if (count($callable_arg->items) !== 2) {
return [];
}
$class_arg = $callable_arg->items[0]->value;
$method_name_arg = $callable_arg->items[1]->value;
if (!$method_name_arg instanceof PhpParser\Node\Scalar\String_) {
return [];
}
if ($class_arg instanceof PhpParser\Node\Scalar\String_) {
return [preg_replace('/^\\\/', '', $class_arg->value) . '::' . $method_name_arg->value];
}
if ($class_arg instanceof PhpParser\Node\Expr\ClassConstFetch
&& is_string($class_arg->name)
&& strtolower($class_arg->name) === 'class'
&& $class_arg->class instanceof PhpParser\Node\Name
) {
$fq_class_name = ClassLikeChecker::getFQCLNFromNameObject(
$class_arg->class,
$statements_checker->getAliases()
);
return [$fq_class_name . '::' . $method_name_arg->value];
}
if (!isset($class_arg->inferredType) || !$class_arg->inferredType->hasObjectType()) {
return [];
}
$method_ids = [];
foreach ($class_arg->inferredType->types as $type_part) {
if ($type_part instanceof TNamedObject) {
$method_ids[] = $type_part . '::' . $method_name_arg->value;
}
}
return $method_ids;
}
/**
* @param StatementsChecker $statements_checker
* @param string $function_id
* @param CodeLocation $code_location
*
* @return bool
*/
protected static function checkFunctionExists(
StatementsChecker $statements_checker,
&$function_id,
CodeLocation $code_location
) {
$cased_function_id = $function_id;
$function_id = strtolower($function_id);
if (!FunctionChecker::functionExists($statements_checker, $function_id)) {
$root_function_id = preg_replace('/.*\\\/', '', $function_id);
if ($function_id !== $root_function_id &&
FunctionChecker::functionExists($statements_checker, $root_function_id)
) {
$function_id = $root_function_id;
} else {
if (IssueBuffer::accepts(
new UndefinedFunction(
'Function ' . $cased_function_id . ' does not exist',
$code_location
),
$statements_checker->getSuppressedIssues()
)) {
// fall through
}
return false;
}
}
return true;
}
}
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