✨ Add check for twig empty lines

Author: VincentLanglet

TwigCS/Ruleset/Generic/EmptyLinesSniff.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace TwigCS\Ruleset\Generic;
+
+use \Exception;
+use TwigCS\Sniff\AbstractSniff;
+use TwigCS\Token\Token;
+
+/**
+ * Checks that there are not 2 empty lines following each other.
+ */
+class EmptyLinesSniff extends AbstractSniff
+{
+    /**
+     * @param int     $tokenPosition
+     * @param Token[] $tokens
+     *
+     * @return Token
+     *
+     * @throws Exception
+     */
+    public function process(int $tokenPosition, array $tokens)
+    {
+        $token = $tokens[$tokenPosition];
+
+        if ($this->isTokenMatching($token, Token::EOL_TYPE)) {
+            $i = 0;
+            while (isset($tokens[$tokenPosition - ($i + 1)])
+                && $this->isTokenMatching($tokens[$tokenPosition - ($i + 1)], Token::EOL_TYPE)
+            ) {
+                $i++;
+            }
+
+            if (1 < $i) {
+                $fix = $this->addFixableMessage(
+                    $this::MESSAGE_TYPE_ERROR,
+                    sprintf('More than 1 empty lines are not allowed, found %d', $i),
+                    $token
+                );
+
+                if ($fix) {
+                    $this->fixer->beginChangeset();
+                    while ($i > 1) {
+                        $this->fixer->replaceToken($tokenPosition - $i, '');
+                        $i--;
+                    }
+                    $this->fixer->endChangeset();
+                }
+            }
+        }
+
+        return $token;
+    }
+}

TwigCS/Tests/Fixtures/EmptyLinesTest.fixed.twig

@@ -0,0 +1,3 @@
+<div class="error">
+
+</div>

TwigCS/Tests/Fixtures/EmptyLinesTest.twig

@@ -0,0 +1,4 @@
+<div class="error">
+
+
+</div>

TwigCS/Tests/Ruleset/Generic/EmptyLinesTest.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace TwigCS\Tests\Ruleset\Generic;
+
+use TwigCS\Ruleset\Generic\EmptyLinesSniff;
+use TwigCS\Tests\AbstractSniffTest;
+
+/**
+ * Class EmptyLinesTest
+ */
+class EmptyLinesTest extends AbstractSniffTest
+{
+    public function testSniff()
+    {
+        $this->checkGenericSniff(new EmptyLinesSniff(), [
+            [3, 1],
+        ]);
+    }
+}