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<?php
declare (strict_types=1);
namespace Rector\Core\PhpParser\Comparing;
use PhpParser\Node;
use PhpParser\Node\Expr\Assign;
use PhpParser\Node\Expr\Variable;
use PhpParser\Node\Stmt;
use PhpParser\Node\Stmt\Else_;
use PhpParser\Node\Stmt\Expression;
use PhpParser\Node\Stmt\If_;
use Rector\Core\PhpParser\Node\BetterNodeFinder;
final class ConditionSearcher
{
/**
* @readonly
* @var \Rector\Core\PhpParser\Node\BetterNodeFinder
*/
private $betterNodeFinder;
/**
* @readonly
* @var \Rector\Core\PhpParser\Comparing\NodeComparator
*/
private $nodeComparator;
public function __construct(\Rector\Core\PhpParser\Node\BetterNodeFinder $betterNodeFinder, \Rector\Core\PhpParser\Comparing\NodeComparator $nodeComparator)
{
$this->betterNodeFinder = $betterNodeFinder;
$this->nodeComparator = $nodeComparator;
}
public function hasIfAndElseForVariableRedeclaration(\PhpParser\Node\Expr\Assign $assign, \PhpParser\Node\Stmt\If_ $if) : bool
{
$elseNode = $if->else;
if (!$elseNode instanceof \PhpParser\Node\Stmt\Else_) {
return \false;
}
/** @var Variable $varNode */
$varNode = $assign->var;
if (!$this->hasVariableRedeclaration($varNode, $if->stmts)) {
return \false;
}
foreach ($if->elseifs as $elseifNode) {
if (!$this->hasVariableRedeclaration($varNode, $elseifNode->stmts)) {
return \false;
}
}
$isInCond = (bool) $this->betterNodeFinder->findFirst($if->cond, function (\PhpParser\Node $subNode) use($varNode) : bool {
return $this->nodeComparator->areNodesEqual($varNode, $subNode);
});
if ($isInCond) {
return \false;
}
return $this->hasVariableRedeclaration($varNode, $elseNode->stmts);
}
/**
* @param Stmt[] $stmts
*/
private function hasVariableRedeclaration(\PhpParser\Node\Expr\Variable $variable, array $stmts) : bool
{
foreach ($stmts as $stmt) {
if ($this->hasVariableUsedInExpression($variable, $stmt)) {
return \false;
}
if ($this->hasVariableDeclaration($variable, $stmt)) {
return \true;
}
}
return \false;
}
private function hasVariableUsedInExpression(\PhpParser\Node\Expr\Variable $variable, \PhpParser\Node\Stmt $stmt) : bool
{
if ($stmt instanceof \PhpParser\Node\Stmt\Expression) {
$node = $stmt->expr instanceof \PhpParser\Node\Expr\Assign ? $stmt->expr->expr : $stmt->expr;
} else {
$node = $stmt;
}
return (bool) $this->betterNodeFinder->findFirst($node, function (\PhpParser\Node $subNode) use($variable) : bool {
return $this->nodeComparator->areNodesEqual($variable, $subNode);
});
}
private function hasVariableDeclaration(\PhpParser\Node\Expr\Variable $variable, \PhpParser\Node\Stmt $stmt) : bool
{
if (!$stmt instanceof \PhpParser\Node\Stmt\Expression) {
return \false;
}
if (!$stmt->expr instanceof \PhpParser\Node\Expr\Assign) {
return \false;
}
$assignVar = $stmt->expr->var;
if (!$assignVar instanceof \PhpParser\Node\Expr\Variable) {
return \false;
}
if ($variable->name !== $assignVar->name) {
return \false;
}
return \true;
}
}
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