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psalm/examples/plugins/composer-based/echo-checker/EchoChecker.php

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<?php
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namespace Psalm\Example\Plugin\ComposerBased;
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use PhpParser;
use Psalm\CodeLocation;
use Psalm\Issue\ArgumentTypeCoercion;
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use Psalm\IssueBuffer;
use Psalm\Plugin\EventHandler\AfterStatementAnalysisInterface;
use Psalm\Plugin\EventHandler\Event\AfterStatementAnalysisEvent;
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use Psalm\Type\Atomic\TLiteralString;
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use Psalm\Type\Atomic\TString;
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class EchoChecker implements AfterStatementAnalysisInterface
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{
/**
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* Called after a statement has been checked
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*
* @return null|false
*/
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public static function afterStatementAnalysis(AfterStatementAnalysisEvent $event): ?bool
{
$stmt = $event->getStmt();
$statements_source = $event->getStatementsSource();
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if ($stmt instanceof PhpParser\Node\Stmt\Echo_) {
foreach ($stmt->exprs as $expr) {
$expr_type = $statements_source->getNodeTypeProvider()->getType($expr);
if (!$expr_type || $expr_type->hasMixed()) {
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if (IssueBuffer::accepts(
new ArgumentTypeCoercion(
'Echo requires an unescaped string, ' . $expr_type . ' provided',
new CodeLocation($statements_source, $expr),
'echo'
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),
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$statements_source->getSuppressedIssues()
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)) {
// keep soldiering on
}
continue;
}
$types = $expr_type->getAtomicTypes();
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foreach ($types as $type) {
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if ($type instanceof TString
&& !$type instanceof TLiteralString
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) {
if (IssueBuffer::accepts(
new ArgumentTypeCoercion(
'Echo requires an unescaped string, ' . $expr_type . ' provided',
new CodeLocation($statements_source, $expr),
'echo'
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),
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$statements_source->getSuppressedIssues()
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)) {
// keep soldiering on
}
}
}
}
}
return null;
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}
}