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<?php declare(strict_types=1);
namespace PhpParser;
use PhpParser\Node\Expr;
use PhpParser\Node\Scalar\Int_;
use PhpParser\Node\Scalar\String_;
use PhpParser\Node\Stmt\Else_;
use PhpParser\Node\Stmt\If_;
class NodeTraverserTest extends \PHPUnit\Framework\TestCase {
public function testNonModifying(): void {
$str1Node = new String_('Foo');
$str2Node = new String_('Bar');
$echoNode = new Node\Stmt\Echo_([$str1Node, $str2Node]);
$stmts = [$echoNode];
$visitor = new NodeVisitorForTesting();
$traverser = new NodeTraverser();
$traverser->addVisitor($visitor);
$this->assertEquals($stmts, $traverser->traverse($stmts));
$this->assertEquals([
['beforeTraverse', $stmts],
['enterNode', $echoNode],
['enterNode', $str1Node],
['leaveNode', $str1Node],
['enterNode', $str2Node],
['leaveNode', $str2Node],
['leaveNode', $echoNode],
['afterTraverse', $stmts],
], $visitor->trace);
}
public function testModifying(): void {
$str1Node = new String_('Foo');
$str2Node = new String_('Bar');
$printNode = new Expr\Print_($str1Node);
// Visitor 2 performs changes, visitors 1 and 3 observe the changes.
$visitor1 = new NodeVisitorForTesting();
$visitor2 = new NodeVisitorForTesting([
['beforeTraverse', [], [$str1Node]],
['enterNode', $str1Node, $printNode],
['enterNode', $str1Node, $str2Node],
['leaveNode', $str2Node, $str1Node],
['leaveNode', $printNode, $str1Node],
['afterTraverse', [$str1Node], []],
]);
$visitor3 = new NodeVisitorForTesting();
$traverser = new NodeTraverser($visitor1, $visitor2, $visitor3);
// as all operations are reversed we end where we start
$this->assertEquals([], $traverser->traverse([]));
$this->assertEquals([
// Sees nodes before changes on entry.
['beforeTraverse', []],
['enterNode', $str1Node],
['enterNode', $str1Node],
// Sees nodes after changes on leave.
['leaveNode', $str1Node],
['leaveNode', $str1Node],
['afterTraverse', []],
], $visitor1->trace);
$this->assertEquals([
// Sees nodes after changes on entry.
['beforeTraverse', [$str1Node]],
['enterNode', $printNode],
['enterNode', $str2Node],
// Sees nodes before changes on leave.
['leaveNode', $str2Node],
['leaveNode', $printNode],
['afterTraverse', [$str1Node]],
], $visitor3->trace);
}
public function testRemoveFromLeave(): void {
$str1Node = new String_('Foo');
$str2Node = new String_('Bar');
$visitor = new NodeVisitorForTesting([
['leaveNode', $str1Node, NodeVisitor::REMOVE_NODE],
]);
$visitor2 = new NodeVisitorForTesting();
$traverser = new NodeTraverser();
$traverser->addVisitor($visitor2);
$traverser->addVisitor($visitor);
$stmts = [$str1Node, $str2Node];
$this->assertEquals([$str2Node], $traverser->traverse($stmts));
$this->assertEquals([
['beforeTraverse', $stmts],
['enterNode', $str1Node],
['enterNode', $str2Node],
['leaveNode', $str2Node],
['afterTraverse', [$str2Node]],
], $visitor2->trace);
}
public function testRemoveFromEnter(): void {
$str1Node = new String_('Foo');
$str2Node = new String_('Bar');
$visitor = new NodeVisitorForTesting([
['enterNode', $str1Node, NodeVisitor::REMOVE_NODE],
]);
$visitor2 = new NodeVisitorForTesting();
$traverser = new NodeTraverser();
$traverser->addVisitor($visitor);
$traverser->addVisitor($visitor2);
$stmts = [$str1Node, $str2Node];
$this->assertEquals([$str2Node], $traverser->traverse($stmts));
$this->assertEquals([
['beforeTraverse', $stmts],
['enterNode', $str2Node],
['leaveNode', $str2Node],
['afterTraverse', [$str2Node]],
], $visitor2->trace);
}
public function testReturnArrayFromEnter(): void {
$str1Node = new String_('Str1');
$str2Node = new String_('Str2');
$str3Node = new String_('Str3');
$str4Node = new String_('Str4');
$visitor = new NodeVisitorForTesting([
['enterNode', $str1Node, [$str3Node, $str4Node]],
]);
$visitor2 = new NodeVisitorForTesting();
$traverser = new NodeTraverser();
$traverser->addVisitor($visitor);
$traverser->addVisitor($visitor2);
$stmts = [$str1Node, $str2Node];
$this->assertEquals([$str3Node, $str4Node, $str2Node], $traverser->traverse($stmts));
$this->assertEquals([
['beforeTraverse', $stmts],
['enterNode', $str2Node],
['leaveNode', $str2Node],
['afterTraverse', [$str3Node, $str4Node, $str2Node]],
], $visitor2->trace);
}
public function testMerge(): void {
$strStart = new String_('Start');
$strMiddle = new String_('End');
$strEnd = new String_('Middle');
$strR1 = new String_('Replacement 1');
$strR2 = new String_('Replacement 2');
$visitor = new NodeVisitorForTesting([
['leaveNode', $strMiddle, [$strR1, $strR2]],
]);
$traverser = new NodeTraverser();
$traverser->addVisitor($visitor);
$this->assertEquals(
[$strStart, $strR1, $strR2, $strEnd],
$traverser->traverse([$strStart, $strMiddle, $strEnd])
);
}
public function testInvalidDeepArray(): void {
$this->expectException(\LogicException::class);
$this->expectExceptionMessage('Invalid node structure: Contains nested arrays');
$strNode = new String_('Foo');
$stmts = [[[$strNode]]];
$traverser = new NodeTraverser();
$this->assertEquals($stmts, $traverser->traverse($stmts));
}
public function testDontTraverseChildren(): void {
$strNode = new String_('str');
$printNode = new Expr\Print_($strNode);
$varNode = new Expr\Variable('foo');
$mulNode = new Expr\BinaryOp\Mul($varNode, $varNode);
$negNode = new Expr\UnaryMinus($mulNode);
$stmts = [$printNode, $negNode];
$visitor1 = new NodeVisitorForTesting([
['enterNode', $printNode, NodeVisitor::DONT_TRAVERSE_CHILDREN],
]);
$visitor2 = new NodeVisitorForTesting([
['enterNode', $mulNode, NodeVisitor::DONT_TRAVERSE_CHILDREN],
]);
$expectedTrace = [
['beforeTraverse', $stmts],
['enterNode', $printNode],
['leaveNode', $printNode],
['enterNode', $negNode],
['enterNode', $mulNode],
['leaveNode', $mulNode],
['leaveNode', $negNode],
['afterTraverse', $stmts],
];
$traverser = new NodeTraverser();
$traverser->addVisitor($visitor1);
$traverser->addVisitor($visitor2);
$this->assertEquals($stmts, $traverser->traverse($stmts));
$this->assertEquals($expectedTrace, $visitor1->trace);
$this->assertEquals($expectedTrace, $visitor2->trace);
}
public function testDontTraverseCurrentAndChildren(): void {
// print 'str'; -($foo * $foo);
$strNode = new String_('str');
$printNode = new Expr\Print_($strNode);
$varNode = new Expr\Variable('foo');
$mulNode = new Expr\BinaryOp\Mul($varNode, $varNode);
$divNode = new Expr\BinaryOp\Div($varNode, $varNode);
$negNode = new Expr\UnaryMinus($mulNode);
$stmts = [$printNode, $negNode];
$visitor1 = new NodeVisitorForTesting([
['enterNode', $printNode, NodeVisitor::DONT_TRAVERSE_CURRENT_AND_CHILDREN],
['enterNode', $mulNode, NodeVisitor::DONT_TRAVERSE_CURRENT_AND_CHILDREN],
['leaveNode', $mulNode, $divNode],
]);
$visitor2 = new NodeVisitorForTesting();
$traverser = new NodeTraverser();
$traverser->addVisitor($visitor1);
$traverser->addVisitor($visitor2);
$resultStmts = $traverser->traverse($stmts);
$this->assertInstanceOf(Expr\BinaryOp\Div::class, $resultStmts[1]->expr);
$this->assertEquals([
['beforeTraverse', $stmts],
['enterNode', $printNode],
['leaveNode', $printNode],
['enterNode', $negNode],
['enterNode', $mulNode],
['leaveNode', $mulNode],
['leaveNode', $negNode],
['afterTraverse', $resultStmts],
], $visitor1->trace);
$this->assertEquals([
['beforeTraverse', $stmts],
['enterNode', $negNode],
['leaveNode', $negNode],
['afterTraverse', $resultStmts],
], $visitor2->trace);
}
public function testStopTraversal(): void {
$varNode1 = new Expr\Variable('a');
$varNode2 = new Expr\Variable('b');
$varNode3 = new Expr\Variable('c');
$mulNode = new Expr\BinaryOp\Mul($varNode1, $varNode2);
$printNode = new Expr\Print_($varNode3);
$stmts = [$mulNode, $printNode];
// From enterNode() with array parent
$visitor = new NodeVisitorForTesting([
['enterNode', $mulNode, NodeVisitor::STOP_TRAVERSAL],
]);
$traverser = new NodeTraverser();
$traverser->addVisitor($visitor);
$this->assertEquals($stmts, $traverser->traverse($stmts));
$this->assertEquals([
['beforeTraverse', $stmts],
['enterNode', $mulNode],
['afterTraverse', $stmts],
], $visitor->trace);
// From enterNode with Node parent
$visitor = new NodeVisitorForTesting([
['enterNode', $varNode1, NodeVisitor::STOP_TRAVERSAL],
]);
$traverser = new NodeTraverser();
$traverser->addVisitor($visitor);
$this->assertEquals($stmts, $traverser->traverse($stmts));
$this->assertEquals([
['beforeTraverse', $stmts],
['enterNode', $mulNode],
['enterNode', $varNode1],
['afterTraverse', $stmts],
], $visitor->trace);
// From leaveNode with Node parent
$visitor = new NodeVisitorForTesting([
['leaveNode', $varNode1, NodeVisitor::STOP_TRAVERSAL],
]);
$traverser = new NodeTraverser();
$traverser->addVisitor($visitor);
$this->assertEquals($stmts, $traverser->traverse($stmts));
$this->assertEquals([
['beforeTraverse', $stmts],
['enterNode', $mulNode],
['enterNode', $varNode1],
['leaveNode', $varNode1],
['afterTraverse', $stmts],
], $visitor->trace);
// From leaveNode with array parent
$visitor = new NodeVisitorForTesting([
['leaveNode', $mulNode, NodeVisitor::STOP_TRAVERSAL],
]);
$traverser = new NodeTraverser();
$traverser->addVisitor($visitor);
$this->assertEquals($stmts, $traverser->traverse($stmts));
$this->assertEquals([
['beforeTraverse', $stmts],
['enterNode', $mulNode],
['enterNode', $varNode1],
['leaveNode', $varNode1],
['enterNode', $varNode2],
['leaveNode', $varNode2],
['leaveNode', $mulNode],
['afterTraverse', $stmts],
], $visitor->trace);
// Check that pending array modifications are still carried out
$visitor = new NodeVisitorForTesting([
['leaveNode', $mulNode, NodeVisitor::REMOVE_NODE],
['enterNode', $printNode, NodeVisitor::STOP_TRAVERSAL],
]);
$traverser = new NodeTraverser();
$traverser->addVisitor($visitor);
$this->assertEquals([$printNode], $traverser->traverse($stmts));
$this->assertEquals([
['beforeTraverse', $stmts],
['enterNode', $mulNode],
['enterNode', $varNode1],
['leaveNode', $varNode1],
['enterNode', $varNode2],
['leaveNode', $varNode2],
['leaveNode', $mulNode],
['enterNode', $printNode],
['afterTraverse', [$printNode]],
], $visitor->trace);
}
public function testReplaceWithNull(): void {
$one = new Int_(1);
$else1 = new Else_();
$else2 = new Else_();
$if1 = new If_($one, ['else' => $else1]);
$if2 = new If_($one, ['else' => $else2]);
$stmts = [$if1, $if2];
$visitor1 = new NodeVisitorForTesting([
['enterNode', $else1, NodeVisitor::REPLACE_WITH_NULL],
['leaveNode', $else2, NodeVisitor::REPLACE_WITH_NULL],
]);
$visitor2 = new NodeVisitorForTesting();
$traverser = new NodeTraverser();
$traverser->addVisitor($visitor1);
$traverser->addVisitor($visitor2);
$newStmts = $traverser->traverse($stmts);
$this->assertEquals([
new If_($one),
new If_($one),
], $newStmts);
$this->assertEquals([
['beforeTraverse', $stmts],
['enterNode', $if1],
['enterNode', $one],
// We never see the if1 Else node.
['leaveNode', $one],
['leaveNode', $if1],
['enterNode', $if2],
['enterNode', $one],
['leaveNode', $one],
// We do see the if2 Else node, as it will only be replaced afterwards.
['enterNode', $else2],
['leaveNode', $else2],
['leaveNode', $if2],
['afterTraverse', $stmts],
], $visitor2->trace);
}
public function testRemovingVisitor(): void {
$visitor1 = new class () extends NodeVisitorAbstract {};
$visitor2 = new class () extends NodeVisitorAbstract {};
$visitor3 = new class () extends NodeVisitorAbstract {};
$traverser = new NodeTraverser();
$traverser->addVisitor($visitor1);
$traverser->addVisitor($visitor2);
$traverser->addVisitor($visitor3);
$getVisitors = (function () {
return $this->visitors;
})->bindTo($traverser, NodeTraverser::class);
$preExpected = [$visitor1, $visitor2, $visitor3];
$this->assertSame($preExpected, $getVisitors());
$traverser->removeVisitor($visitor2);
$postExpected = [$visitor1, $visitor3];
$this->assertSame($postExpected, $getVisitors());
}
public function testNoCloneNodes(): void {
$stmts = [new Node\Stmt\Echo_([new String_('Foo'), new String_('Bar')])];
$traverser = new NodeTraverser();
$this->assertSame($stmts, $traverser->traverse($stmts));
}
/**
* @dataProvider provideTestInvalidReturn
*/
public function testInvalidReturn($stmts, $visitor, $message): void {
$this->expectException(\LogicException::class);
$this->expectExceptionMessage($message);
$traverser = new NodeTraverser();
$traverser->addVisitor($visitor);
$traverser->traverse($stmts);
}
public static function provideTestInvalidReturn() {
$num = new Node\Scalar\Int_(42);
$expr = new Node\Stmt\Expression($num);
$stmts = [$expr];
$visitor1 = new NodeVisitorForTesting([
['enterNode', $expr, 'foobar'],
]);
$visitor2 = new NodeVisitorForTesting([
['enterNode', $num, 'foobar'],
]);
$visitor3 = new NodeVisitorForTesting([
['leaveNode', $num, 'foobar'],
]);
$visitor4 = new NodeVisitorForTesting([
['leaveNode', $expr, 'foobar'],
]);
$visitor5 = new NodeVisitorForTesting([
['leaveNode', $num, [new Node\Scalar\Float_(42.0)]],
]);
$visitor6 = new NodeVisitorForTesting([
['leaveNode', $expr, false],
]);
$visitor7 = new NodeVisitorForTesting([
['enterNode', $expr, new Node\Scalar\Int_(42)],
]);
$visitor8 = new NodeVisitorForTesting([
['enterNode', $num, new Node\Stmt\Return_()],
]);
$visitor9 = new NodeVisitorForTesting([
['enterNode', $expr, NodeVisitor::REPLACE_WITH_NULL],
]);
$visitor10 = new NodeVisitorForTesting([
['leaveNode', $expr, NodeVisitor::REPLACE_WITH_NULL],
]);
return [
[$stmts, $visitor1, 'enterNode() returned invalid value of type string'],
[$stmts, $visitor2, 'enterNode() returned invalid value of type string'],
[$stmts, $visitor3, 'leaveNode() returned invalid value of type string'],
[$stmts, $visitor4, 'leaveNode() returned invalid value of type string'],
[$stmts, $visitor5, 'leaveNode() may only return an array if the parent structure is an array'],
[$stmts, $visitor6, 'leaveNode() returned invalid value of type bool'],
[$stmts, $visitor7, 'Trying to replace statement (Stmt_Expression) with expression (Scalar_Int). Are you missing a Stmt_Expression wrapper?'],
[$stmts, $visitor8, 'Trying to replace expression (Scalar_Int) with statement (Stmt_Return)'],
[$stmts, $visitor9, 'REPLACE_WITH_NULL can not be used if the parent structure is an array'],
[$stmts, $visitor10, 'REPLACE_WITH_NULL can not be used if the parent structure is an array'],
];
}
}
|
