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SscanfFunctionDynamicReturnTypeExtension.php
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SscanfFunctionDynamicReturnTypeExtension.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\Constant\ConstantArrayTypeBuilder;
use PHPStan\Type\Constant\ConstantIntegerType;
use PHPStan\Type\Constant\ConstantStringType;
use PHPStan\Type\DynamicFunctionReturnTypeExtension;
use PHPStan\Type\FloatType;
use PHPStan\Type\IntegerType;
use PHPStan\Type\StringType;
use PHPStan\Type\Type;
use PHPStan\Type\TypeCombinator;
use function count;
use function in_array;
use function preg_match_all;
class SscanfFunctionDynamicReturnTypeExtension implements DynamicFunctionReturnTypeExtension
{
public function isFunctionSupported(FunctionReflection $functionReflection): bool
{
return in_array($functionReflection->getName(), ['sscanf', 'fscanf'], true);
}
public function getTypeFromFunctionCall(
FunctionReflection $functionReflection,
FuncCall $functionCall,
Scope $scope,
): ?Type
{
$args = $functionCall->getArgs();
if (count($args) !== 2) {
return null;
}
$formatType = $scope->getType($args[1]->value);
if (!$formatType instanceof ConstantStringType) {
return null;
}
if (preg_match_all('/%[cdeEfosux]{1}/', $formatType->getValue(), $matches) > 0) {
$arrayBuilder = ConstantArrayTypeBuilder::createEmpty();
for ($i = 0; $i < count($matches[0]); $i++) {
$type = new StringType();
if (in_array($matches[0][$i], ['%d', '%o', '%u', '%x'], true)) {
$type = new IntegerType();
}
if (in_array($matches[0][$i], ['%e', '%E', '%f'], true)) {
$type = new FloatType();
}
$arrayBuilder->setOffsetValueType(new ConstantIntegerType($i), $type);
}
return TypeCombinator::addNull($arrayBuilder->getArray());
}
return null;
}
}