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psalm/tests/TypeReconciliation/EmptyTest.php

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<?php
namespace Psalm\Tests\TypeReconciliation;
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use Psalm\Tests\TestCase;
use Psalm\Tests\Traits\InvalidCodeAnalysisTestTrait;
use Psalm\Tests\Traits\ValidCodeAnalysisTestTrait;
class EmptyTest extends TestCase
{
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use InvalidCodeAnalysisTestTrait;
use ValidCodeAnalysisTestTrait;
/**
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* @return iterable<string,array{code:string,assertions?:array<string,string>,ignored_issues?:list<string>}>
*/
public function providerValidCodeParse(): iterable
{
return [
'ifNotUndefinedAndEmpty' => [
'code' => '<?php
$a = !empty($b) ? $b : null;',
'assertions' => [
'$a' => 'mixed|null',
],
'ignored_issues' => ['MixedAssignment'],
],
'emptyArrayVar' => [
'code' => '<?php
function a(array $in): void
{
$r = [];
foreach ($in as $entry) {
if (!empty($entry["a"])) {
$r[] = [];
}
if (empty($entry["a"])) {
$r[] = [];
}
}
}
function b(array $in): void
{
$i = 0;
foreach ($in as $entry) {
if (!empty($entry["a"])) {
$i--;
}
if (empty($entry["a"])) {
$i++;
}
}
}
function c(array $in): void
{
foreach ($in as $entry) {
if (!empty($entry["a"])) {}
}
foreach ($in as $entry) {
if (empty($entry["a"])) {}
}
}',
'assertions' => [],
'ignored_issues' => ['MixedAssignment', 'MixedArrayAccess'],
],
'removeEmptyArray' => [
'code' => '<?php
$arr_or_string = [];
if (rand(0, 1)) {
$arr_or_string = "hello";
}
/** @return void **/
function foo(string $s) {}
if (!empty($arr_or_string)) {
foo($arr_or_string);
}',
],
'emptyArrayReconciliationThenIf' => [
'code' => '<?php
/**
* @param string|string[] $a
*/
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function foo($a): string {
if (is_string($a)) {
return $a;
} elseif (empty($a)) {
return "goodbye";
}
if (isset($a[0])) {
return $a[0];
};
return "not found";
}',
],
'emptyStringReconciliationThenIf' => [
'code' => '<?php
/**
* @param Exception|string|string[] $a
*/
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function foo($a): string {
if (is_array($a)) {
return "hello";
} elseif (empty($a)) {
return "goodbye";
}
if (is_string($a)) {
return $a;
};
return "an exception";
}',
],
'emptyExceptionReconciliationAfterIf' => [
'code' => '<?php
/**
* @param Exception|null $a
*/
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function foo($a): string {
if ($a && $a->getMessage() === "hello") {
return "hello";
} elseif (empty($a)) {
return "goodbye";
}
return $a->getMessage();
}',
],
'noFalsyLeak' => [
'code' => '<?php
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function foo(string $s): void {
if (empty($s) || $s === "hello") {}
}',
],
'noRedundantConditionOnMixed' => [
'code' => '<?php
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function testarray(array $data): void {
foreach ($data as $item) {
if (!empty($item["a"]) && !empty($item["b"]["c"])) {
echo "Found\n";
}
}
}',
'assertions' => [],
'ignored_issues' => ['MixedAssignment', 'MixedArrayAccess'],
],
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'dontBleedEmptyAfterExtract' => [
'code' => '<?php
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function foo(array $args): void {
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extract($args);
if ((empty($arr) && empty($a)) || $c === 0) {
} else {
foreach ($arr as $b) {}
}
}',
'assertions' => [],
'ignored_issues' => ['MixedAssignment', 'MixedArgument'],
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],
'emptyTKeyedArray' => [
'code' => '<?php
$arr = [
"profile" => [
"foo" => "bar",
],
"groups" => [
"foo" => "bar",
"hide" => rand(0, 5),
],
];
foreach ($arr as $item) {
if (empty($item["hide"]) || $item["hide"] === 3) {}
}',
],
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'alwaysBoolResult' => [
'code' => '<?php
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function takesBool(bool $p): void {}
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takesBool(empty($q));',
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],
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'noRedundantConditionAfterFalsyIntChecks' => [
'code' => '<?php
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function foo(int $t) : void {
if (!$t) {
foreach ([0, 1, 2] as $a) {
if (!$t) {
$t = $a;
}
}
}
}',
],
'noRedundantConditionAfterEmptyMixedChecks' => [
'code' => '<?php
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function foo($t) : void {
if (empty($t)) {
foreach ($_GET["u"] as $a) {
if (empty($t)) {
$t = $a;
}
}
}
}',
'assertions' => [],
'ignored_issues' => ['MixedAssignment', 'MissingParamType'],
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],
'canBeNonEmptyArray' => [
'code' => '<?php
function _processScopes($scopes) : void {
if (!is_array($scopes) && !empty($scopes)) {
$scopes = explode(" ", trim($scopes));
} else {
// false is allowed here
}
if (empty($scopes)){}
}',
'assertions' => [],
'ignored_issues' => ['MixedAssignment', 'MissingParamType', 'MixedArgument'],
],
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'multipleEmptiesInCondition' => [
'code' => '<?php
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/** @param array<int, int> $o */
function foo(array $o) : void {
if (empty($o[0]) && empty($o[1])) {}
}',
],
'multipleEmptiesInConditionWithMixedOffset' => [
'code' => '<?php
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/** @param array $o */
function foo(array $o) : void {
if (empty($o[0]) && empty($o[1])) {}
}',
],
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'unsetChangesArrayEmptiness' => [
'code' => '<?php
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function foo(array $n): void {
if (empty($n)) {
return;
}
while (!empty($n)) {
unset($n[rand(0, 10)]);
}
}',
],
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'unsetChangesComplicatedArrayEmptiness' => [
'code' => '<?php
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function contains(array $data, array $needle): bool {
if (empty($data) || empty($needle)) {
return false;
}
$stack = [];
while (!empty($needle)) {
$key = key($needle);
if ($key === null) continue;
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$val = $needle[$key];
unset($needle[$key]);
if (array_key_exists($key, $data) && is_array($val)) {
$next = $data[$key];
unset($data[$key]);
if (!empty($val)) {
$stack[] = [$val, $next];
}
} elseif (!array_key_exists($key, $data) || $data[$key] != $val) {
return false;
}
if (empty($needle) && !empty($stack)) {
list($needle, $data) = array_pop($stack);
}
}
return true;
}',
'assertions' => [],
'ignored_issues' => ['MixedAssignment', 'MissingParamType', 'MixedArgument', 'MixedArrayOffset', 'MixedArrayAccess'],
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],
'possiblyEmptyIterable' => [
'code' => '<?php
function foo(iterable $i) : void {
if (empty($i)) {}
if (!empty($i)) {}
}',
],
'allowEmptyClassConstantOffsetCheck' => [
'code' => '<?php
class Foo {
const BAR = "bar";
const ONE = 1;
}
/**
* @param array<string,string> $data
*/
function bat(array $data) : void {
if (!empty($data["foo"])) {
if (empty($data[Foo::BAR])) {}
}
}
/**
* @param array<int,string> $data
*/
function baz(array $data) : void {
if (!empty($data[0])) {
if (empty($data[Foo::ONE])) {}
}
}',
],
'doubleEmptyCheckTwoArrays' => [
'code' => '<?php
function foo(array $a, array $b) : void {
if (empty($a) && empty($b)) {}
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}',
],
'doubleEmptyCheckOnTKeyedArray' => [
'code' => '<?php
/**
* @param array{a: array, b: array} $arr
*/
function foo(array $arr) : void {
if (empty($arr["a"]) && empty($arr["b"])) {}
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}',
],
'doubleEmptyCheckOnTKeyedArrayVariableOffsets' => [
'code' => '<?php
function foo(int $i, int $j) : void {
$arr = [];
$arr[0] = rand(0, 1);
$arr[1] = rand(0, 1);
if (empty($arr[$i]) && empty($arr[$j])) {}
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}',
],
'checkArrayEmptyUnknownRoot' => [
'code' => '<?php
function foo(array $arr) : void {
if (empty($arr[rand(0, 1)])) {
if ($arr) {}
}
}',
],
'allowEmptyCheckOnPossiblyNullPropertyFetch' => [
'code' => '<?php
class A {
public bool $b = false;
}
function foo(?A $a) : void {
if (!empty($a->b)) {}
}',
],
'allowNumericEmpty' => [
'code' => '<?php
/**
* @param numeric $p
*/
function f($p): bool {
if (empty($p)) {
return false;
}
return true;
}'
],
'possiblyUndefinedArrayOffset' => [
'code' => '<?php
$d = [];
if (!rand(0,1)) {
$d[0] = "a";
}
if (empty($d[0])) {}'
],
'reconcileNonEmptyArrayKey' => [
'code' => '<?php
/**
* @param array{a?: string, b: string} $arr
*/
function createFromString(array $arr): void
{
if (empty($arr["a"])) {
return;
}
echo $arr["a"];
}'
],
'reconcileEmptyTwiceWithoutReturn' => [
'code' => '<?php
function foo(array $arr): void {
if (!empty($arr["a"])) {
} else {
if (empty($arr["dontcare"])) {}
}
if (empty($arr["a"])) {}
}'
],
'reconcileEmptyTwiceWithReturn' => [
'code' => '<?php
function foo(array $arr): void {
if (!empty($arr["a"])) {
} else {
if (empty($arr["dontcare"])) {
return;
}
}
if (empty($arr["a"])) {}
}'
],
];
}
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/**
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* @return iterable<string,array{code:string,error_message:string,ignored_issues?:list<string>,php_version?:string}>
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*/
public function providerInvalidCodeParse(): iterable
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{
return [
'preventImpossibleEmpty' => [
'code' => '<?php
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function foo(array $arr) : void {
if (empty($ar)) {
// do something
}
}',
'error_message' => 'UndefinedVariable',
],
'reconciliationForMixed' => [
'code' => '<?php
function foo(array $arr) : void {
$a = empty($arr["a"]) ? "" : $arr["a"];
if ($a) {
if ($a) {}
}
}',
'error_message' => 'RedundantCondition',
'ignored_issues' => ['MixedAssignment', 'MissingParamType'],
],
'preventEmptyOnBool' => [
'code' => '<?php
function foo(bool $b) : void {
if (!empty($b)) {}
}',
'error_message' => 'InvalidArgument',
],
'preventEmptyCreatingArray' => [
'code' => '<?php
/** @return array{a:mixed} */
function foo(array $r) {
if (!empty($r["a"])) {}
return $r;
}',
'error_message' => 'MixedReturnTypeCoercion'
],
'preventEmptyEquivalentCreatingArray' => [
'code' => '<?php
/** @return array{a:mixed} */
function foo(array $r) {
if (isset($r["a"]) && $r["a"]) {}
return $r;
}',
'error_message' => 'MixedReturnTypeCoercion'
],
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];
}
}