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implemented ConstantStringType inference for str_repeat #1030

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merged 3 commits into from Feb 22, 2022
Merged

implemented ConstantStringType inference for str_repeat #1030

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255b97f
implemented ConstantStringType inference to StrRepeatFunctionReturnTy…
clxmstaab Feb 22, 2022
954e089
adjusted test-expectations for the more precise result
clxmstaab Feb 22, 2022
e3df0c3
don't crash on negative multiplier
clxmstaab Feb 22, 2022
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4 changes: 4 additions & 0 deletions src/Type/Php/StrRepeatFunctionReturnTypeExtension.php
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Expand Up @@ -42,6 +42,10 @@ public function getTypeFromFunctionCall(
return new ConstantStringType('');
}

if ($inputType instanceof ConstantStringType && $multiplierType instanceof ConstantIntegerType) {
return new ConstantStringType(str_repeat($inputType->getValue(), $multiplierType->getValue()));
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The code will crash when analysing code like this: https://3v4l.org/XRaOj

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good point. added a test and made it return NeverType on negative multiplier

}

$accessoryTypes = [];
if ($inputType->isNonEmptyString()->yes()) {
if (IntegerRangeType::fromInterval(1, null)->isSuperTypeOf($multiplierType)->yes()) {
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5 changes: 3 additions & 2 deletions tests/PHPStan/Analyser/data/literal-string.php
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Expand Up @@ -25,8 +25,9 @@ public function doFoo($literalString, string $string)

assertType('string', str_repeat($string, 10));
assertType('literal-string', str_repeat($literalString, 10));
assertType('literal-string', str_repeat('', 10));
assertType('literal-string&non-empty-string', str_repeat('foo', 10));
assertType("''", str_repeat('', 10));
assertType("'foofoofoofoofoofoofoofoofoofoo'", str_repeat('foo', 10));
assertType("'?,?,?,'", str_repeat('?,', 3));

assertType('non-empty-string', str_pad($string, 5, $string));
assertType('non-empty-string', str_pad($literalString, 5, $string));
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