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psalm/src/Psalm/Checker/Statements/Block/ForChecker.php

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<?php
namespace Psalm\Checker\Statements\Block;
use PhpParser;
use Psalm\Context;
use Psalm\Checker\Statements\ExpressionChecker;
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use Psalm\Checker\StatementsChecker;
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use Psalm\Type;
class ForChecker
{
/**
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* @param StatementsChecker $statements_checker
* @param PhpParser\Node\Stmt\For_ $stmt
* @param Context $context
* @return false|null
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*/
public static function analyze(
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StatementsChecker $statements_checker,
PhpParser\Node\Stmt\For_ $stmt,
Context $context
) {
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foreach ($stmt->init as $init) {
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if (ExpressionChecker::analyze($statements_checker, $init, $context) === false) {
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return false;
}
}
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$for_context = clone $context;
$before_context = clone $context;
$for_context->inside_loop = true;
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foreach ($stmt->cond as $condition) {
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$for_context->inside_conditional = true;
if (ExpressionChecker::analyze($statements_checker, $condition, $for_context) === false) {
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return false;
}
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$for_context->inside_conditional = false;
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}
$changed_vars = Context::getNewOrUpdatedVarIds($before_context, $for_context);
$statements_checker->analyzeLoop($stmt->stmts, $changed_vars, $for_context, $context);
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foreach ($stmt->loop as $expr) {
if (ExpressionChecker::analyze($statements_checker, $expr, $for_context) === false) {
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return false;
}
}
foreach ($context->vars_in_scope as $var => $type) {
if ($type->isMixed()) {
continue;
}
if ($for_context->vars_in_scope[$var]->isMixed()) {
$context->vars_in_scope[$var] = $for_context->vars_in_scope[$var];
}
if ((string) $for_context->vars_in_scope[$var] !== (string) $type) {
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$context->vars_in_scope[$var] = Type::combineUnionTypes(
$context->vars_in_scope[$var],
$for_context->vars_in_scope[$var]
);
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$context->removeVarFromConflictingClauses($var);
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}
}
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$context->vars_possibly_in_scope = array_merge(
$for_context->vars_possibly_in_scope,
$context->vars_possibly_in_scope
);
if ($context->collect_references) {
$context->referenced_vars = array_merge(
$for_context->referenced_vars,
$context->referenced_vars
);
}
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return null;
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}
}