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ArrayFetchAnalyzer.php
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ArrayFetchAnalyzer.php
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<?php
namespace Psalm\Internal\Analyzer\Statements\Expression\Fetch;
use PhpParser;
use Psalm\CodeLocation;
use Psalm\Codebase;
use Psalm\Context;
use Psalm\Internal\Analyzer\FunctionLikeAnalyzer;
use Psalm\Internal\Analyzer\Statements\Expression\Call\MethodCallAnalyzer;
use Psalm\Internal\Analyzer\Statements\Expression\ExpressionIdentifier;
use Psalm\Internal\Analyzer\Statements\ExpressionAnalyzer;
use Psalm\Internal\Analyzer\StatementsAnalyzer;
use Psalm\Internal\Analyzer\TraitAnalyzer;
use Psalm\Internal\Codebase\TaintFlowGraph;
use Psalm\Internal\Codebase\VariableUseGraph;
use Psalm\Internal\DataFlow\DataFlowNode;
use Psalm\Internal\Type\Comparator\TypeComparisonResult;
use Psalm\Internal\Type\Comparator\UnionTypeComparator;
use Psalm\Internal\Type\TemplateInferredTypeReplacer;
use Psalm\Internal\Type\TemplateResult;
use Psalm\Internal\Type\TypeCombiner;
use Psalm\Internal\Type\TypeExpander;
use Psalm\Issue\EmptyArrayAccess;
use Psalm\Issue\InvalidArrayAccess;
use Psalm\Issue\InvalidArrayAssignment;
use Psalm\Issue\InvalidArrayOffset;
use Psalm\Issue\MixedArrayAccess;
use Psalm\Issue\MixedArrayAssignment;
use Psalm\Issue\MixedArrayOffset;
use Psalm\Issue\MixedArrayTypeCoercion;
use Psalm\Issue\MixedStringOffsetAssignment;
use Psalm\Issue\NullArrayAccess;
use Psalm\Issue\NullArrayOffset;
use Psalm\Issue\PossiblyInvalidArrayAccess;
use Psalm\Issue\PossiblyInvalidArrayAssignment;
use Psalm\Issue\PossiblyInvalidArrayOffset;
use Psalm\Issue\PossiblyNullArrayAccess;
use Psalm\Issue\PossiblyNullArrayAssignment;
use Psalm\Issue\PossiblyNullArrayOffset;
use Psalm\Issue\PossiblyUndefinedArrayOffset;
use Psalm\Issue\PossiblyUndefinedIntArrayOffset;
use Psalm\Issue\PossiblyUndefinedStringArrayOffset;
use Psalm\IssueBuffer;
use Psalm\Node\Expr\VirtualConstFetch;
use Psalm\Node\Expr\VirtualMethodCall;
use Psalm\Node\VirtualArg;
use Psalm\Node\VirtualIdentifier;
use Psalm\Node\VirtualName;
use Psalm\Plugin\EventHandler\Event\AddRemoveTaintsEvent;
use Psalm\Type;
use Psalm\Type\Atomic;
use Psalm\Type\Atomic\TArray;
use Psalm\Type\Atomic\TArrayKey;
use Psalm\Type\Atomic\TBool;
use Psalm\Type\Atomic\TClassConstant;
use Psalm\Type\Atomic\TClassString;
use Psalm\Type\Atomic\TClassStringMap;
use Psalm\Type\Atomic\TFalse;
use Psalm\Type\Atomic\TFloat;
use Psalm\Type\Atomic\TInt;
use Psalm\Type\Atomic\TKeyedArray;
use Psalm\Type\Atomic\TList;
use Psalm\Type\Atomic\TLiteralFloat;
use Psalm\Type\Atomic\TLiteralInt;
use Psalm\Type\Atomic\TLiteralString;
use Psalm\Type\Atomic\TMixed;
use Psalm\Type\Atomic\TNamedObject;
use Psalm\Type\Atomic\TNever;
use Psalm\Type\Atomic\TNonEmptyArray;
use Psalm\Type\Atomic\TNonEmptyList;
use Psalm\Type\Atomic\TNull;
use Psalm\Type\Atomic\TObject;
use Psalm\Type\Atomic\TObjectWithProperties;
use Psalm\Type\Atomic\TSingleLetter;
use Psalm\Type\Atomic\TString;
use Psalm\Type\Atomic\TTemplateIndexedAccess;
use Psalm\Type\Atomic\TTemplateKeyOf;
use Psalm\Type\Atomic\TTemplateParam;
use Psalm\Type\Atomic\TTemplateParamClass;
use Psalm\Type\Atomic\TTrue;
use Psalm\Type\Union;
use UnexpectedValueException;
use function array_keys;
use function array_map;
use function array_pop;
use function array_values;
use function count;
use function implode;
use function in_array;
use function is_int;
use function preg_match;
use function strlen;
use function strtolower;
/**
* @internal
*/
class ArrayFetchAnalyzer
{
public static function analyze(
StatementsAnalyzer $statements_analyzer,
PhpParser\Node\Expr\ArrayDimFetch $stmt,
Context $context
): bool {
$array_var_id = ExpressionIdentifier::getArrayVarId(
$stmt->var,
$statements_analyzer->getFQCLN(),
$statements_analyzer
);
if ($stmt->dim) {
$was_inside_general_use = $context->inside_general_use;
$context->inside_general_use = true;
$was_inside_unset = $context->inside_unset;
$context->inside_unset = false;
if (ExpressionAnalyzer::analyze($statements_analyzer, $stmt->dim, $context) === false) {
$context->inside_unset = $was_inside_unset;
$context->inside_general_use = $was_inside_general_use;
return false;
}
$context->inside_unset = $was_inside_unset;
$context->inside_general_use = $was_inside_general_use;
}
$keyed_array_var_id = ExpressionIdentifier::getArrayVarId(
$stmt,
$statements_analyzer->getFQCLN(),
$statements_analyzer
);
$dim_var_id = null;
$new_offset_type = null;
if ($stmt->dim) {
$used_key_type = $statements_analyzer->node_data->getType($stmt->dim) ?? Type::getMixed();
$dim_var_id = ExpressionIdentifier::getArrayVarId(
$stmt->dim,
$statements_analyzer->getFQCLN(),
$statements_analyzer
);
} else {
$used_key_type = Type::getInt();
}
if (ExpressionAnalyzer::analyze(
$statements_analyzer,
$stmt->var,
$context
) === false) {
return false;
}
$stmt_var_type = $statements_analyzer->node_data->getType($stmt->var);
$codebase = $statements_analyzer->getCodebase();
if ($keyed_array_var_id
&& $context->hasVariable($keyed_array_var_id)
&& !$context->vars_in_scope[$keyed_array_var_id]->possibly_undefined
&& $stmt_var_type
&& !$stmt_var_type->hasClassStringMap()
) {
$stmt_type = clone $context->vars_in_scope[$keyed_array_var_id];
$statements_analyzer->node_data->setType(
$stmt,
$stmt_type
);
self::taintArrayFetch(
$statements_analyzer,
$stmt->var,
$keyed_array_var_id,
$stmt_type,
$used_key_type,
$context
);
return true;
}
$can_store_result = false;
if ($stmt_var_type) {
if ($stmt_var_type->isNull()) {
if (!$context->inside_isset) {
IssueBuffer::maybeAdd(
new NullArrayAccess(
'Cannot access array value on null variable ' . $array_var_id,
new CodeLocation($statements_analyzer->getSource(), $stmt)
),
$statements_analyzer->getSuppressedIssues()
);
}
$stmt_type = $statements_analyzer->node_data->getType($stmt);
$statements_analyzer->node_data->setType(
$stmt,
Type::combineUnionTypes($stmt_type, Type::getNull())
);
return true;
}
$stmt_type = self::getArrayAccessTypeGivenOffset(
$statements_analyzer,
$stmt,
$stmt_var_type,
$used_key_type,
false,
$array_var_id,
$context,
null
);
if ($stmt->dim && $stmt_var_type->hasArray()) {
/**
* @psalm-suppress PossiblyUndefinedStringArrayOffset
* @var TArray|TKeyedArray|TList|TClassStringMap
*/
$array_type = $stmt_var_type->getAtomicTypes()['array'];
if ($array_type instanceof TClassStringMap) {
$array_value_type = Type::getMixed();
} elseif ($array_type instanceof TArray) {
$array_value_type = $array_type->type_params[1];
} elseif ($array_type instanceof TList) {
$array_value_type = $array_type->type_param;
} else {
$array_value_type = $array_type->getGenericValueType();
}
if ($context->inside_assignment || !$array_value_type->isMixed()) {
$can_store_result = true;
}
}
$statements_analyzer->node_data->setType($stmt, $stmt_type);
if ($context->inside_isset
&& $stmt->dim
&& ($stmt_dim_type = $statements_analyzer->node_data->getType($stmt->dim))
&& $stmt_var_type->hasArray()
&& ($stmt->var instanceof PhpParser\Node\Expr\ClassConstFetch
|| $stmt->var instanceof PhpParser\Node\Expr\ConstFetch)
) {
/**
* @psalm-suppress PossiblyUndefinedStringArrayOffset
* @var TArray|TKeyedArray|TList
*/
$array_type = $stmt_var_type->getAtomicTypes()['array'];
if ($array_type instanceof TArray) {
$const_array_key_type = $array_type->type_params[0];
} elseif ($array_type instanceof TList) {
$const_array_key_type = Type::getInt();
} else {
$const_array_key_type = $array_type->getGenericKeyType();
}
if ($dim_var_id
&& !$const_array_key_type->hasMixed()
&& !$stmt_dim_type->hasMixed()
) {
$new_offset_type = clone $stmt_dim_type;
$const_array_key_atomic_types = $const_array_key_type->getAtomicTypes();
foreach ($new_offset_type->getAtomicTypes() as $offset_key => $offset_atomic_type) {
if ($offset_atomic_type instanceof TString
|| $offset_atomic_type instanceof TInt
) {
if (!isset($const_array_key_atomic_types[$offset_key])
&& !UnionTypeComparator::isContainedBy(
$codebase,
new Union([$offset_atomic_type]),
$const_array_key_type
)
) {
$new_offset_type->removeType($offset_key);
}
} elseif (!UnionTypeComparator::isContainedBy(
$codebase,
$const_array_key_type,
new Union([$offset_atomic_type])
)) {
$new_offset_type->removeType($offset_key);
}
}
}
}
}
if ($keyed_array_var_id
&& $context->hasVariable($keyed_array_var_id)
&& (!($stmt_type = $statements_analyzer->node_data->getType($stmt)) || $stmt_type->isVanillaMixed())
) {
$statements_analyzer->node_data->setType($stmt, $context->vars_in_scope[$keyed_array_var_id]);
}
if (!($stmt_type = $statements_analyzer->node_data->getType($stmt))) {
$stmt_type = Type::getMixed();
$statements_analyzer->node_data->setType($stmt, $stmt_type);
} else {
if ($stmt_type->possibly_undefined
&& !$context->inside_isset
&& !$context->inside_unset
&& ($stmt_var_type && !$stmt_var_type->hasMixed())
) {
IssueBuffer::maybeAdd(
new PossiblyUndefinedArrayOffset(
'Possibly undefined array key ' . $keyed_array_var_id
. ' on ' . $stmt_var_type->getId(),
new CodeLocation($statements_analyzer->getSource(), $stmt)
),
$statements_analyzer->getSuppressedIssues()
);
}
$stmt_type->possibly_undefined = false;
}
if ($context->inside_isset && $dim_var_id && $new_offset_type && !$new_offset_type->isUnionEmpty()) {
$context->vars_in_scope[$dim_var_id] = $new_offset_type;
}
if ($keyed_array_var_id && !$context->inside_isset && $can_store_result) {
$context->vars_in_scope[$keyed_array_var_id] = $stmt_type;
$context->vars_possibly_in_scope[$keyed_array_var_id] = true;
// reference the variable too
$context->hasVariable($keyed_array_var_id);
}
self::taintArrayFetch(
$statements_analyzer,
$stmt->var,
$keyed_array_var_id,
$stmt_type,
$used_key_type,
$context
);
return true;
}
/**
* Used to create a path between a variable $foo and $foo["a"]
*/
public static function taintArrayFetch(
StatementsAnalyzer $statements_analyzer,
PhpParser\Node\Expr $var,
?string $keyed_array_var_id,
Union $stmt_type,
Union $offset_type,
?Context $context = null
): void {
if ($statements_analyzer->data_flow_graph
&& ($stmt_var_type = $statements_analyzer->node_data->getType($var))
&& $stmt_var_type->parent_nodes
) {
if ($statements_analyzer->data_flow_graph instanceof TaintFlowGraph
&& in_array('TaintedInput', $statements_analyzer->getSuppressedIssues())
) {
$stmt_var_type->parent_nodes = [];
return;
}
$added_taints = [];
$removed_taints = [];
if ($context) {
$codebase = $statements_analyzer->getCodebase();
$event = new AddRemoveTaintsEvent($var, $context, $statements_analyzer, $codebase);
$added_taints = $codebase->config->eventDispatcher->dispatchAddTaints($event);
$removed_taints = $codebase->config->eventDispatcher->dispatchRemoveTaints($event);
}
$var_location = new CodeLocation($statements_analyzer->getSource(), $var);
$new_parent_node = DataFlowNode::getForAssignment(
$keyed_array_var_id ?: 'arrayvalue-fetch',
$var_location
);
$array_key_node = null;
$statements_analyzer->data_flow_graph->addNode($new_parent_node);
$dim_value = $offset_type->isSingleStringLiteral()
? $offset_type->getSingleStringLiteral()->value
: ($offset_type->isSingleIntLiteral()
? $offset_type->getSingleIntLiteral()->value
: null);
if ($keyed_array_var_id === null && $dim_value === null) {
$array_key_node = DataFlowNode::getForAssignment(
'arraykey-fetch',
$var_location
);
$statements_analyzer->data_flow_graph->addNode($array_key_node);
}
foreach ($stmt_var_type->parent_nodes as $parent_node) {
$statements_analyzer->data_flow_graph->addPath(
$parent_node,
$new_parent_node,
'arrayvalue-fetch' . ($dim_value !== null ? '-\'' . $dim_value . '\'' : ''),
$added_taints,
$removed_taints
);
if ($stmt_type->by_ref) {
$statements_analyzer->data_flow_graph->addPath(
$new_parent_node,
$parent_node,
'arrayvalue-assignment' . ($dim_value !== null ? '-\'' . $dim_value . '\'' : ''),
$added_taints,
$removed_taints
);
}
if ($array_key_node) {
$statements_analyzer->data_flow_graph->addPath(
$parent_node,
$array_key_node,
'arraykey-fetch',
$added_taints,
$removed_taints
);
}
}
$stmt_type->parent_nodes = [$new_parent_node->id => $new_parent_node];
if ($array_key_node) {
$offset_type->parent_nodes = [$array_key_node->id => $array_key_node];
}
}
}
/**
* @psalm-suppress ComplexMethod to be refactored.
* Good type/bad type behaviour could be mutualised with ArrayAnalyzer
*/
public static function getArrayAccessTypeGivenOffset(
StatementsAnalyzer $statements_analyzer,
PhpParser\Node\Expr\ArrayDimFetch $stmt,
Union $array_type,
Union $offset_type,
bool $in_assignment,
?string $array_var_id,
Context $context,
PhpParser\Node\Expr $assign_value = null,
Union $replacement_type = null
): Union {
$codebase = $statements_analyzer->getCodebase();
$has_array_access = false;
$non_array_types = [];
$has_valid_expected_offset = false;
$expected_offset_types = [];
$key_values = [];
if ($stmt->dim instanceof PhpParser\Node\Scalar\String_
|| $stmt->dim instanceof PhpParser\Node\Scalar\LNumber
) {
$key_values[] = $stmt->dim->value;
} elseif ($stmt->dim && ($stmt_dim_type = $statements_analyzer->node_data->getType($stmt->dim))) {
$string_literals = $stmt_dim_type->getLiteralStrings();
$int_literals = $stmt_dim_type->getLiteralInts();
$all_atomic_types = $stmt_dim_type->getAtomicTypes();
if (count($string_literals) + count($int_literals) === count($all_atomic_types)) {
foreach ($string_literals as $string_literal) {
$key_values[] = $string_literal->value;
}
foreach ($int_literals as $int_literal) {
$key_values[] = $int_literal->value;
}
}
}
$array_access_type = null;
if ($offset_type->isNull()) {
IssueBuffer::maybeAdd(
new NullArrayOffset(
'Cannot access value on variable ' . $array_var_id . ' using null offset',
new CodeLocation($statements_analyzer->getSource(), $stmt)
),
$statements_analyzer->getSuppressedIssues()
);
if ($in_assignment) {
$offset_type->removeType('null');
$offset_type->addType(new TLiteralInt(0));
}
}
if ($offset_type->isNullable() && !$context->inside_isset) {
if (!$offset_type->ignore_nullable_issues) {
IssueBuffer::maybeAdd(
new PossiblyNullArrayOffset(
'Cannot access value on variable ' . $array_var_id
. ' using possibly null offset ' . $offset_type,
new CodeLocation($statements_analyzer->getSource(), $stmt->var)
),
$statements_analyzer->getSuppressedIssues()
);
}
if ($in_assignment) {
$offset_type->removeType('null');
if (!$offset_type->ignore_nullable_issues) {
$offset_type->addType(new TLiteralInt(0));
}
}
}
if ($array_type->isArray()) {
$has_valid_absolute_offset = self::checkArrayOffsetType(
$offset_type,
$offset_type->getAtomicTypes(),
$codebase
);
if ($has_valid_absolute_offset === false) {
//we didn't find a single type that could be valid
$expected_offset_types[] = 'array-key';
}
} else {
//on not-arrays, the type is considered valid
$has_valid_absolute_offset = true;
}
foreach ($array_type->getAtomicTypes() as $type_string => $type) {
$original_type = $type;
if ($type instanceof TMixed
|| $type instanceof TTemplateParam
|| $type instanceof TNever
) {
if (!$type instanceof TTemplateParam || $type->as->isMixed() || !$type->as->isSingle()) {
$array_access_type = self::handleMixedArrayAccess(
$context,
$statements_analyzer,
$codebase,
$in_assignment,
$array_var_id,
$stmt,
$array_access_type,
$type
);
$has_valid_expected_offset = true;
continue;
}
$type = clone $type->as->getSingleAtomic();
}
if ($type instanceof TNull) {
if ($array_type->ignore_nullable_issues) {
continue;
}
if ($in_assignment) {
if ($replacement_type) {
$array_access_type = Type::combineUnionTypes($array_access_type, clone $replacement_type);
} else {
IssueBuffer::maybeAdd(
new PossiblyNullArrayAssignment(
'Cannot access array value on possibly null variable ' . $array_var_id .
' of type ' . $array_type,
new CodeLocation($statements_analyzer->getSource(), $stmt)
),
$statements_analyzer->getSuppressedIssues()
);
$array_access_type = new Union([new TNever]);
}
} else {
if (!$context->inside_isset && !MethodCallAnalyzer::hasNullsafe($stmt->var)) {
IssueBuffer::maybeAdd(
new PossiblyNullArrayAccess(
'Cannot access array value on possibly null variable ' . $array_var_id .
' of type ' . $array_type,
new CodeLocation($statements_analyzer->getSource(), $stmt)
),
$statements_analyzer->getSuppressedIssues()
);
}
$array_access_type = Type::combineUnionTypes($array_access_type, Type::getNull());
}
continue;
}
if ($type instanceof TArray
|| $type instanceof TKeyedArray
|| $type instanceof TList
|| $type instanceof TClassStringMap
) {
self::handleArrayAccessOnArray(
$in_assignment,
$type,
$key_values,
$array_type,
$type_string,
$stmt,
$replacement_type,
$offset_type,
$original_type,
$codebase,
$array_var_id,
$context,
$statements_analyzer,
$expected_offset_types,
$array_access_type,
$has_array_access,
$has_valid_expected_offset
);
continue;
}
if ($type instanceof TString) {
self::handleArrayAccessOnString(
$statements_analyzer,
$codebase,
$stmt,
$in_assignment,
$context,
$replacement_type,
$type,
$offset_type,
$expected_offset_types,
$array_access_type,
$has_valid_expected_offset
);
continue;
}
if (!$context->collect_initializations
&& !$context->collect_mutations
&& $statements_analyzer->getFilePath() === $statements_analyzer->getRootFilePath()
&& (!(($parent_source = $statements_analyzer->getSource())
instanceof FunctionLikeAnalyzer)
|| !$parent_source->getSource() instanceof TraitAnalyzer)
) {
$codebase->analyzer->incrementNonMixedCount($statements_analyzer->getFilePath());
}
if ($type instanceof TFalse && $array_type->ignore_falsable_issues) {
continue;
}
if ($type instanceof TNamedObject) {
self::handleArrayAccessOnNamedObject(
$statements_analyzer,
$stmt,
$type,
$context,
$in_assignment,
$assign_value,
$array_access_type,
$has_array_access
);
} elseif (!$array_type->hasMixed()) {
$non_array_types[] = (string)$type;
}
}
if ($non_array_types) {
if ($has_array_access) {
if ($in_assignment) {
if (IssueBuffer::accepts(
new PossiblyInvalidArrayAssignment(
'Cannot access array value on non-array variable ' .
$array_var_id . ' of type ' . $non_array_types[0],
new CodeLocation($statements_analyzer->getSource(), $stmt)
),
$statements_analyzer->getSuppressedIssues()
)
) {
// do nothing
}
} elseif (!$context->inside_isset) {
if (IssueBuffer::accepts(
new PossiblyInvalidArrayAccess(
'Cannot access array value on non-array variable ' .
$array_var_id . ' of type ' . $non_array_types[0],
new CodeLocation($statements_analyzer->getSource(), $stmt)
),
$statements_analyzer->getSuppressedIssues()
)
) {
// do nothing
}
}
} else {
if ($in_assignment) {
IssueBuffer::maybeAdd(
new InvalidArrayAssignment(
'Cannot access array value on non-array variable ' .
$array_var_id . ' of type ' . $non_array_types[0],
new CodeLocation($statements_analyzer->getSource(), $stmt)
),
$statements_analyzer->getSuppressedIssues()
);
} else {
IssueBuffer::maybeAdd(
new InvalidArrayAccess(
'Cannot access array value on non-array variable ' .
$array_var_id . ' of type ' . $non_array_types[0],
new CodeLocation($statements_analyzer->getSource(), $stmt)
),
$statements_analyzer->getSuppressedIssues()
);
}
$array_access_type = Type::getMixed();
}
}
if ($offset_type->hasMixed()) {
if (!$context->collect_initializations
&& !$context->collect_mutations
&& $statements_analyzer->getFilePath() === $statements_analyzer->getRootFilePath()
&& (!(($parent_source = $statements_analyzer->getSource())
instanceof FunctionLikeAnalyzer)
|| !$parent_source->getSource() instanceof TraitAnalyzer)
) {
$codebase->analyzer->incrementMixedCount($statements_analyzer->getFilePath());
}
IssueBuffer::maybeAdd(
new MixedArrayOffset(
'Cannot access value on variable ' . $array_var_id . ' using mixed offset',
new CodeLocation($statements_analyzer->getSource(), $stmt)
),
$statements_analyzer->getSuppressedIssues()
);
} else {
if (!$context->collect_initializations
&& !$context->collect_mutations
&& $statements_analyzer->getFilePath() === $statements_analyzer->getRootFilePath()
&& (!(($parent_source = $statements_analyzer->getSource())
instanceof FunctionLikeAnalyzer)
|| !$parent_source->getSource() instanceof TraitAnalyzer)
) {
$codebase->analyzer->incrementNonMixedCount($statements_analyzer->getFilePath());
}
if ($expected_offset_types) {
$invalid_offset_type = $expected_offset_types[0];
$used_offset = 'using a ' . $offset_type->getId() . ' offset';
if ($key_values) {
$used_offset = "using offset value of '" . implode('|', $key_values) . "'";
}
if ($has_valid_expected_offset && $has_valid_absolute_offset && $context->inside_isset) {
// do nothing
} elseif ($has_valid_expected_offset && $has_valid_absolute_offset) {
if (!$context->inside_unset) {
IssueBuffer::maybeAdd(
new PossiblyInvalidArrayOffset(
'Cannot access value on variable ' . $array_var_id . ' ' . $used_offset
. ', expecting ' . $invalid_offset_type,
new CodeLocation($statements_analyzer->getSource(), $stmt)
),
$statements_analyzer->getSuppressedIssues()
);
}
} else {
$good_types = [];
$bad_types = [];
foreach ($offset_type->getAtomicTypes() as $atomic_key_type) {
if (!$atomic_key_type instanceof TString
&& !$atomic_key_type instanceof TInt
&& !$atomic_key_type instanceof TArrayKey
&& !$atomic_key_type instanceof TMixed
&& !$atomic_key_type instanceof TTemplateParam
&& !(
$atomic_key_type instanceof TObjectWithProperties
&& isset($atomic_key_type->methods['__toString'])
)
) {
$bad_types[] = $atomic_key_type;
if ($atomic_key_type instanceof TFalse) {
$good_types[] = new TLiteralInt(0);
} elseif ($atomic_key_type instanceof TTrue) {
$good_types[] = new TLiteralInt(1);
} elseif ($atomic_key_type instanceof TBool) {
$good_types[] = new TLiteralInt(0);
$good_types[] = new TLiteralInt(1);
} elseif ($atomic_key_type instanceof TLiteralFloat) {
$good_types[] = new TLiteralInt((int)$atomic_key_type->value);
} elseif ($atomic_key_type instanceof TFloat) {
$good_types[] = new TInt;
} else {
$good_types[] = new TArrayKey;
}
}
}
if ($bad_types && $good_types) {
$offset_type->substitute(
TypeCombiner::combine($bad_types, $codebase),
TypeCombiner::combine($good_types, $codebase)
);
}
IssueBuffer::maybeAdd(
new InvalidArrayOffset(
'Cannot access value on variable ' . $array_var_id . ' ' . $used_offset
. ', expecting ' . $invalid_offset_type,
new CodeLocation($statements_analyzer->getSource(), $stmt)
),
$statements_analyzer->getSuppressedIssues()
);
}
}
}
if ($array_access_type === null) {
// shouldn’t happen, but don’t crash
return Type::getMixed();
}
if ($array_type->by_ref) {
$array_access_type->by_ref = true;
}
if ($in_assignment) {
$array_type->bustCache();
}
return $array_access_type;
}
private static function checkLiteralIntArrayOffset(
Union $offset_type,
Union $expected_offset_type,
?string $array_var_id,
PhpParser\Node\Expr\ArrayDimFetch $stmt,
Context $context,
StatementsAnalyzer $statements_analyzer
): void {
if ($context->inside_isset || $context->inside_unset) {
return;
}
if ($offset_type->hasLiteralInt()) {
$found_match = false;
foreach ($offset_type->getAtomicTypes() as $offset_type_part) {
if ($array_var_id
&& $offset_type_part instanceof TLiteralInt
&& isset(
$context->vars_in_scope[
$array_var_id . '[' . $offset_type_part->value . ']'
]
)
&& !$context->vars_in_scope[
$array_var_id . '[' . $offset_type_part->value . ']'
]->possibly_undefined
) {
$found_match = true;
break;
}
}
if (!$found_match) {
IssueBuffer::maybeAdd(
new PossiblyUndefinedIntArrayOffset(
'Possibly undefined array offset \''
. $offset_type->getId() . '\' '
. 'is risky given expected type \''
. $expected_offset_type->getId() . '\'.'
. ' Consider using isset beforehand.',
new CodeLocation($statements_analyzer->getSource(), $stmt)
),
$statements_analyzer->getSuppressedIssues()
);
}
}
}
private static function checkLiteralStringArrayOffset(
Union $offset_type,
Union $expected_offset_type,
?string $array_var_id,
PhpParser\Node\Expr\ArrayDimFetch $stmt,
Context $context,
StatementsAnalyzer $statements_analyzer
): void {
if ($context->inside_isset || $context->inside_unset) {
return;
}
if ($offset_type->hasLiteralString() && !$expected_offset_type->hasLiteralClassString()) {
$found_match = false;
foreach ($offset_type->getAtomicTypes() as $offset_type_part) {
if ($array_var_id
&& $offset_type_part instanceof TLiteralString
&& isset(
$context->vars_in_scope[
$array_var_id . '[\'' . $offset_type_part->value . '\']'
]
)
&& !$context->vars_in_scope[
$array_var_id . '[\'' . $offset_type_part->value . '\']'
]->possibly_undefined
) {
$found_match = true;
break;
}
}
if (!$found_match) {
IssueBuffer::maybeAdd(
new PossiblyUndefinedStringArrayOffset(
'Possibly undefined array offset \''
. $offset_type->getId() . '\' '
. 'is risky given expected type \''
. $expected_offset_type->getId() . '\'.'
. ' Consider using isset beforehand.',
new CodeLocation($statements_analyzer->getSource(), $stmt)
),
$statements_analyzer->getSuppressedIssues()
);
}
}
}
public static function replaceOffsetTypeWithInts(Union $offset_type): Union
{
$offset_types = $offset_type->getAtomicTypes();
$cloned = false;
foreach ($offset_types as $key => $offset_type_part) {
if ($offset_type_part instanceof TLiteralString) {
if (preg_match('/^(0|[1-9][0-9]*)$/', $offset_type_part->value)) {
if (!$cloned) {
$offset_type = clone $offset_type;
$cloned = true;
}
$offset_type->addType(new TLiteralInt((int) $offset_type_part->value));
$offset_type->removeType($key);
}
} elseif ($offset_type_part instanceof TBool) {
if (!$cloned) {
$offset_type = clone $offset_type;
$cloned = true;
}
if ($offset_type_part instanceof TFalse) {
if (!$offset_type->ignore_falsable_issues) {
$offset_type->addType(new TLiteralInt(0));
$offset_type->removeType($key);
}
} elseif ($offset_type_part instanceof TTrue) {
$offset_type->addType(new TLiteralInt(1));
$offset_type->removeType($key);
} else {
$offset_type->addType(new TLiteralInt(0));
$offset_type->addType(new TLiteralInt(1));
$offset_type->removeType($key);
}
}
}
return $offset_type;
}
/**