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psalm/src/Psalm/Internal/Analyzer/Statements/ThrowAnalyzer.php

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<?php
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namespace Psalm\Internal\Analyzer\Statements;
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use PhpParser;
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use Psalm\Internal\Analyzer\StatementsAnalyzer;
use Psalm\Internal\Analyzer\TypeAnalyzer;
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use Psalm\CodeLocation;
use Psalm\Context;
use Psalm\Issue\InvalidThrow;
use Psalm\IssueBuffer;
use Psalm\Type\Atomic\TNamedObject;
use Psalm\Type\Union;
/**
* @internal
*/
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class ThrowAnalyzer
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{
/**
* @return false|null
*/
public static function analyze(
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StatementsAnalyzer $statements_analyzer,
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PhpParser\Node\Stmt\Throw_ $stmt,
Context $context
) {
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if (ExpressionAnalyzer::analyze($statements_analyzer, $stmt->expr, $context) === false) {
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return false;
}
if ($context->check_classes && isset($stmt->expr->inferredType) && !$stmt->expr->inferredType->isMixed()) {
$throw_type = $stmt->expr->inferredType;
$exception_type = new Union([new TNamedObject('Exception'), new TNamedObject('Throwable')]);
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$file_analyzer = $statements_analyzer->getFileAnalyzer();
$codebase = $statements_analyzer->getCodebase();
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foreach ($throw_type->getTypes() as $throw_type_part) {
$throw_type_candidate = new Union([$throw_type_part]);
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if (!TypeAnalyzer::isContainedBy($codebase, $throw_type_candidate, $exception_type)) {
if (IssueBuffer::accepts(
new InvalidThrow(
'Cannot throw ' . $throw_type_part
. ' as it does not extend Exception or implement Throwable',
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new CodeLocation($file_analyzer, $stmt),
(string) $throw_type_part
),
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$statements_analyzer->getSuppressedIssues()
)) {
return false;
}
} elseif ($context->collect_exceptions) {
foreach ($throw_type->getTypes() as $throw_atomic_type) {
if ($throw_atomic_type instanceof TNamedObject) {
$context->possibly_thrown_exceptions[$throw_atomic_type->value] = true;
}
}
}
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}
}
}
}