[CodeStyle] Newline before assign

config/set/coding-style/coding-style.yaml

@@ -24,3 +24,4 @@ services:
 
     Rector\CodingStyle\Rector\ClassConst\VarConstantCommentRector: ~
     Rector\CodingStyle\Rector\Encapsed\EncapsedStringsToSprintfRector: ~
+    Rector\CodingStyle\Rector\ClassMethod\NewlineBeforeNewAssignSetRector: ~

packages/CodingStyle/src/Rector/ClassMethod/NewlineBeforeNewAssignSetRector.php

@@ -0,0 +1,109 @@
+<?php declare(strict_types=1);
+
+namespace Rector\CodingStyle\Rector\ClassMethod;
+
+use PhpParser\Node;
+use PhpParser\Node\Expr\Assign;
+use PhpParser\Node\Expr\MethodCall;
+use PhpParser\Node\Expr\Variable;
+use PhpParser\Node\Stmt\Expression;
+use PhpParser\Node\Stmt\Nop;
+use Rector\Rector\AbstractRector;
+use Rector\RectorDefinition\CodeSample;
+use Rector\RectorDefinition\RectorDefinition;
+
+/**
+ * @see \Rector\CodingStyle\Tests\Rector\ClassMethod\NewlineBeforeNewAssignSetRector\NewlineBeforeNewAssignSetRectorTest
+ */
+final class NewlineBeforeNewAssignSetRector extends AbstractRector
+{
+    public function getDefinition(): RectorDefinition
+    {
+        return new RectorDefinition('Add extra space before new assign set', [
+            new CodeSample(
+                <<<'CODE_SAMPLE'
+final class SomeClass
+{
+    public function run()
+    {
+        $value = new Value;
+        $value->setValue(5);
+        $value2 = new Value;
+        $value2->setValue(1);
+    }
+}
+CODE_SAMPLE
+                ,
+                <<<'CODE_SAMPLE'
+final class SomeClass
+{
+    public function run()
+    {
+        $value = new Value;
+        $value->setValue(5);
+
+        $value2 = new Value;
+        $value2->setValue(1);
+    }
+}
+CODE_SAMPLE
+            ),
+        ]);
+    }
+
+    /**
+     * @return string[]
+     */
+    public function getNodeTypes(): array
+    {
+        return [Node\Stmt\ClassMethod::class, Node\Stmt\Function_::class, Node\Expr\Closure::class];
+    }
+
+    /**
+     * @param Node\Stmt\ClassMethod|Node\Stmt\Function_|Node\Expr\Closure $node
+     */
+    public function refactor(Node $node): ?Node
+    {
+        $previousStmtVariableName = null;
+
+        if ($node->stmts === null) {
+            return null;
+        }
+
+        foreach ($node->stmts as $key => $stmt) {
+            $currentStmtVariableName = null;
+
+            if ($stmt instanceof Expression) {
+                $stmt = $stmt->expr;
+            }
+
+            if ($stmt instanceof Assign || $stmt instanceof MethodCall) {
+                if ($stmt->var instanceof Variable) {
+                    $currentStmtVariableName = $this->getName($stmt->var);
+                }
+            }
+
+            if ($this->isNewVariableThanBefore($previousStmtVariableName, $currentStmtVariableName)) {
+                // insert newline before
+                array_splice($node->stmts, $key, 0, [new Nop()]);
+            }
+
+            $previousStmtVariableName = $currentStmtVariableName;
+        }
+
+        return $node;
+    }
+
+    private function isNewVariableThanBefore(?string $previousStmtVariableName, ?string $currentStmtVariableName): bool
+    {
+        if ($previousStmtVariableName === null) {
+            return false;
+        }
+
+        if ($currentStmtVariableName === null) {
+            return false;
+        }
+
+        return $previousStmtVariableName !== $currentStmtVariableName;
+    }
+}

packages/CodingStyle/tests/Rector/ClassMethod/NewlineBeforeNewAssignSetRector/Fixture/fixture.php.inc

@@ -0,0 +1,34 @@
+<?php
+
+namespace Rector\CodingStyle\Tests\Rector\ClassMethod\NewlineBeforeNewAssignSetRector\Fixture;
+
+final class SomeClass
+{
+    public function run()
+    {
+        $value = new Value;
+        $value->setValue(5);
+        $value2 = new Value;
+        $value2->setValue(1);
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\CodingStyle\Tests\Rector\ClassMethod\NewlineBeforeNewAssignSetRector\Fixture;
+
+final class SomeClass
+{
+    public function run()
+    {
+        $value = new Value;
+        $value->setValue(5);
+
+        $value2 = new Value;
+        $value2->setValue(1);
+    }
+}
+
+?>

packages/CodingStyle/tests/Rector/ClassMethod/NewlineBeforeNewAssignSetRector/NewlineBeforeNewAssignSetRectorTest.php

@@ -0,0 +1,19 @@
+<?php declare(strict_types=1);
+
+namespace Rector\CodingStyle\Tests\Rector\ClassMethod\NewlineBeforeNewAssignSetRector;
+
+use Rector\CodingStyle\Rector\ClassMethod\NewlineBeforeNewAssignSetRector;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+
+final class NewlineBeforeNewAssignSetRectorTest extends AbstractRectorTestCase
+{
+    public function test(): void
+    {
+        $this->doTestFiles([__DIR__ . '/Fixture/fixture.php.inc']);
+    }
+
+    protected function getRectorClass(): string
+    {
+        return NewlineBeforeNewAssignSetRector::class;
+    }
+}

src/PhpParser/Printer/BetterStandardPrinter.php

@@ -84,7 +84,19 @@ public function pArray(
         // reindex positions for printer
         $nodes = array_values($nodes);
 
-        return parent::pArray($nodes, $origNodes, $pos, $indentAdjustment, $parentNodeType, $subNodeName, $fixup);
+        $content = parent::pArray($nodes, $origNodes, $pos, $indentAdjustment, $parentNodeType, $subNodeName, $fixup);
+
+        if ($content === null) {
+            return $content;
+        }
+
+        if (! $this->containsNop($nodes)) {
+            return $content;
+        }
+
+        // remove extra spaces before new Nop_ nodes, @see https://regex101.com/r/iSvroO/1
+        return Strings::replace($content, '#^[ \t]+$#m');
+        return Strings::replace($content, '#^[ \t]+$#m');
     }
 
     /**
@@ -196,4 +208,18 @@ protected function pStmt_Class(Class_ $class): string
 
         return parent::pStmt_Class($class);
     }
+
+    /**
+     * @param Node[] $nodes
+     */
+    private function containsNop(array $nodes): bool
+    {
+        foreach ($nodes as $node) {
+            if ($node instanceof Node\Stmt\Nop) {
+                return true;
+            }
+        }
+
+        return false;
+    }
 }