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infer non-falsy-string in sscanf() #1662

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merged 1 commit into from
Sep 1, 2022
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infer non-falsy-string in sscanf() #1662

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16 changes: 12 additions & 4 deletions src/Type/Php/SscanfFunctionDynamicReturnTypeExtension.php
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@
use PHPStan\Analyser\Scope;
use PHPStan\Reflection\FunctionReflection;
use PHPStan\Type\Accessory\AccessoryNonEmptyStringType;
use PHPStan\Type\Accessory\AccessoryNonFalsyStringType;
use PHPStan\Type\Constant\ConstantArrayTypeBuilder;
use PHPStan\Type\Constant\ConstantIntegerType;
use PHPStan\Type\Constant\ConstantStringType;
Expand Down Expand Up @@ -54,10 +55,17 @@ public function getTypeFromFunctionCall(

$type = new StringType();
if ($length !== '') {
$type = new IntersectionType([
$type,
new AccessoryNonEmptyStringType(),
]);
if (((int) $length) > 1) {
$type = new IntersectionType([
$type,
new AccessoryNonFalsyStringType(),
]);
} else {
$type = new IntersectionType([
$type,
new AccessoryNonEmptyStringType(),
]);
}
}

if (in_array($specifier, ['d', 'o', 'u', 'x'], true)) {
Expand Down
10 changes: 8 additions & 2 deletions tests/PHPStan/Analyser/data/sscanf.php
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Expand Up @@ -37,8 +37,14 @@ function fscanfFormatInference($r) {
assertType('int|null', $year);
}

function fooo() {
function fooo(string $s) {
// %0s returns the whole string
assertType('array{non-empty-string|null}|null', sscanf( "0" , "%0s"));
assertType('array{non-empty-string|null}|null', sscanf( "123456" , "%0s"));
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@staabm staabm Aug 31, 2022 •
edited
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actually for a non-falsy-string $string this line could lead to a more precise 'array{non-falsy-string|null}|null', but I feel like %0s as a format is more or less a theoretical thing.. never seen it used anywhere.. I think people would use %s instead.

I figured its not important enough to complicate the extension for it

assertType('array{non-empty-string|null}|null', sscanf( "123456" , "%3s"));

assertType('array{non-empty-string|null}|null', sscanf( "123456" , "%1s"));
assertType('array{non-falsy-string|null}|null', sscanf( "123456" , "%2s"));
assertType('array{non-falsy-string|null}|null', sscanf( "123456" , "%3s"));

assertType('array{int|null, int|null, int|null}|null', sscanf('00ccff', '%2x%2x%2x'));
}