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<?php namespace SuperClosure\Analyzer\Visitor;
use SuperClosure\Exception\ClosureAnalysisException;
use PhpParser\Node\Stmt\Namespace_ as NamespaceNode;
use PhpParser\Node\Stmt\Trait_ as TraitNode;
use PhpParser\Node\Stmt\Class_ as ClassNode;
use PhpParser\Node\Expr\Closure as ClosureNode;
use PhpParser\Node as AstNode;
use PhpParser\NodeVisitorAbstract as NodeVisitor;
/**
* This is a visitor that extends the nikic/php-parser library and looks for a
* closure node and its location.
*
* @internal
*/
final class ClosureLocatorVisitor extends NodeVisitor
{
/**
* @var \ReflectionFunction
*/
private $reflection;
/**
* @var ClosureNode
*/
public $closureNode;
/**
* @var array
*/
public $location;
/**
* @param \ReflectionFunction $reflection
*/
public function __construct($reflection)
{
$this->reflection = $reflection;
$this->location = [
'class' => null,
'directory' => dirname($this->reflection->getFileName()),
'file' => $this->reflection->getFileName(),
'function' => $this->reflection->getName(),
'line' => $this->reflection->getStartLine(),
'method' => null,
'namespace' => null,
'trait' => null,
];
}
public function enterNode(AstNode $node)
{
// Determine information about the closure's location
if (!$this->closureNode) {
if ($node instanceof NamespaceNode) {
$namespace = $node->name !== null
? $node->name->toString()
: null;
$this->location['namespace'] = $namespace;
}
if ($node instanceof TraitNode) {
$this->location['trait'] = (string) $node->name;
$this->location['class'] = null;
} elseif ($node instanceof ClassNode) {
$this->location['class'] = (string) $node->name;
$this->location['trait'] = null;
}
}
// Locate the node of the closure
if ($node instanceof ClosureNode) {
if ($node->getAttribute('startLine') == $this->location['line']) {
if ($this->closureNode) {
$line = $this->location['file'] . ':' . $node->getAttribute('startLine');
throw new ClosureAnalysisException("Two closures were "
. "declared on the same line ({$line}) of code. Cannot "
. "determine which closure was the intended target.");
} else {
$this->closureNode = $node;
}
}
}
}
public function leaveNode(AstNode $node)
{
// Determine information about the closure's location
if (!$this->closureNode) {
if ($node instanceof NamespaceNode) {
$this->location['namespace'] = null;
}
if ($node instanceof TraitNode) {
$this->location['trait'] = null;
} elseif ($node instanceof ClassNode) {
$this->location['class'] = null;
}
}
}
public function afterTraverse(array $nodes)
{
if ($this->location['class']) {
$this->location['class'] = $this->location['namespace'] . '\\' . $this->location['class'];
$this->location['method'] = "{$this->location['class']}::{$this->location['function']}";
} elseif ($this->location['trait']) {
$this->location['trait'] = $this->location['namespace'] . '\\' . $this->location['trait'];
$this->location['method'] = "{$this->location['trait']}::{$this->location['function']}";
// If the closure was declared in a trait, then we will do a best
// effort guess on the name of the class that used the trait. It's
// actually impossible at this point to know for sure what it is.
if ($closureScope = $this->reflection->getClosureScopeClass()) {
$this->location['class'] = $closureScope ? $closureScope->getName() : null;
} elseif ($closureThis = $this->reflection->getClosureThis()) {
$this->location['class'] = get_class($closureThis);
}
}
}
}