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StrRepeatFunctionReturnTypeExtension.php
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StrRepeatFunctionReturnTypeExtension.php
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<?php declare(strict_types = 1);
namespace PHPStan\Type\Php;
use PhpParser\Node\Expr\FuncCall;
use PHPStan\Analyser\Scope;
use PHPStan\Reflection\FunctionReflection;
use PHPStan\Type\Accessory\AccessoryLiteralStringType;
use PHPStan\Type\Accessory\AccessoryNonEmptyStringType;
use PHPStan\Type\Constant\ConstantIntegerType;
use PHPStan\Type\Constant\ConstantStringType;
use PHPStan\Type\DynamicFunctionReturnTypeExtension;
use PHPStan\Type\IntegerRangeType;
use PHPStan\Type\IntersectionType;
use PHPStan\Type\NeverType;
use PHPStan\Type\StringType;
use PHPStan\Type\Type;
use function count;
class StrRepeatFunctionReturnTypeExtension implements DynamicFunctionReturnTypeExtension
{
public function isFunctionSupported(FunctionReflection $functionReflection): bool
{
return $functionReflection->getName() === 'str_repeat';
}
public function getTypeFromFunctionCall(
FunctionReflection $functionReflection,
FuncCall $functionCall,
Scope $scope,
): Type
{
$args = $functionCall->getArgs();
if (count($args) < 2) {
return new StringType();
}
$inputType = $scope->getType($args[0]->value);
$multiplierType = $scope->getType($args[1]->value);
if ((new ConstantIntegerType(0))->isSuperTypeOf($multiplierType)->yes()) {
return new ConstantStringType('');
}
if ($multiplierType instanceof ConstantIntegerType && $multiplierType->getValue() < 0){
return new NeverType();
}
if ($inputType instanceof ConstantStringType && $multiplierType instanceof ConstantIntegerType) {
return new ConstantStringType(str_repeat($inputType->getValue(), $multiplierType->getValue()));
}
$accessoryTypes = [];
if ($inputType->isNonEmptyString()->yes()) {
if (IntegerRangeType::fromInterval(1, null)->isSuperTypeOf($multiplierType)->yes()) {
$accessoryTypes[] = new AccessoryNonEmptyStringType();
}
}
if ($inputType->isLiteralString()->yes()) {
$accessoryTypes[] = new AccessoryLiteralStringType();
}
if (count($accessoryTypes) > 0) {
$accessoryTypes[] = new StringType();
return new IntersectionType($accessoryTypes);
}
return new StringType();
}
}