Ruleset::explain(): refactor method to remove use of output buffers + add test

src/Ruleset.php

@@ -240,14 +240,10 @@ public function explain()
         $sniffs = array_keys($this->sniffCodes);
         sort($sniffs);
 
-        ob_start();
+        $sniffCount = count($sniffs);
 
-        $lastStandard = null;
-        $lastCount    = 0;
-        $sniffCount   = count($sniffs);
-
-        // Add a dummy entry to the end so we loop
-        // one last time and clear the output buffer.
+        // Add a dummy entry to the end so we loop one last time
+        // and echo out the collected info about the last standard.
         $sniffs[] = '';
 
         $summaryLine = PHP_EOL."The $this->name standard contains 1 sniff".PHP_EOL;
@@ -257,7 +253,9 @@ public function explain()
 
         echo $summaryLine;
 
-        ob_start();
+        $lastStandard     = null;
+        $lastCount        = 0;
+        $sniffsInStandard = [];
 
         foreach ($sniffs as $i => $sniff) {
             if ($i === $sniffCount) {
@@ -269,32 +267,31 @@ public function explain()
                 }
             }
 
+            // Reached the first item in the next standard.
+            // Echo out the info collected from the previous standard.
             if ($currentStandard !== $lastStandard) {
-                $sniffList = ob_get_contents();
-                ob_end_clean();
-
-                echo PHP_EOL.$lastStandard.' ('.$lastCount.' sniff';
+                $subTitle = $lastStandard.' ('.$lastCount.' sniff';
                 if ($lastCount > 1) {
-                    echo 's';
+                    $subTitle .= 's';
                 }
 
-                echo ')'.PHP_EOL;
-                echo str_repeat('-', (strlen($lastStandard.$lastCount) + 10));
-                echo PHP_EOL;
-                echo $sniffList;
+                $subTitle .= ')';
 
-                $lastStandard = $currentStandard;
-                $lastCount    = 0;
+                echo PHP_EOL.$subTitle.PHP_EOL;
+                echo str_repeat('-', strlen($subTitle)).PHP_EOL;
+                echo '  '.implode(PHP_EOL.'  ', $sniffsInStandard).PHP_EOL;
+
+                $lastStandard     = $currentStandard;
+                $lastCount        = 0;
+                $sniffsInStandard = [];
 
                 if ($currentStandard === null) {
                     break;
                 }
-
-                ob_start();
             }//end if
 
-            echo '  '.$sniff.PHP_EOL;
-            $lastCount++;
+            $sniffsInStandard[] = $sniff;
+            ++$lastCount;
         }//end foreach
 
     }//end explain()

tests/Core/Ruleset/ExplainTest.php

@@ -0,0 +1,60 @@
+<?php
+/**
+ * Tests to verify that the "explain" command functions as expected.
+ *
+ * @author    Juliette Reinders Folmer <[email protected]>
+ * @copyright 2023 Juliette Reinders Folmer. All rights reserved.
+ * @license   https://github.com/squizlabs/PHP_CodeSniffer/blob/master/licence.txt BSD Licence
+ */
+
+namespace PHP_CodeSniffer\Tests\Core\Ruleset;
+
+use PHP_CodeSniffer\Config;
+use PHP_CodeSniffer\Ruleset;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Test the Ruleset::explain() function.
+ *
+ * @covers \PHP_CodeSniffer\Ruleset::explain
+ */
+class ExplainTest extends TestCase
+{
+
+
+    /**
+     * Test the output of the "explain" command.
+     *
+     * @return void
+     */
+    public function testExplain()
+    {
+        // Set up the ruleset.
+        $config  = new Config(['--standard=PSR1', '-e']);
+        $ruleset = new Ruleset($config);
+
+        $expected  = PHP_EOL;
+        $expected .= 'The PSR1 standard contains 8 sniffs'.PHP_EOL.PHP_EOL;
+        $expected .= 'Generic (4 sniffs)'.PHP_EOL;
+        $expected .= '------------------'.PHP_EOL;
+        $expected .= '  Generic.Files.ByteOrderMark'.PHP_EOL;
+        $expected .= '  Generic.NamingConventions.UpperCaseConstantName'.PHP_EOL;
+        $expected .= '  Generic.PHP.DisallowAlternativePHPTags'.PHP_EOL;
+        $expected .= '  Generic.PHP.DisallowShortOpenTag'.PHP_EOL.PHP_EOL;
+        $expected .= 'PSR1 (3 sniffs)'.PHP_EOL;
+        $expected .= '---------------'.PHP_EOL;
+        $expected .= '  PSR1.Classes.ClassDeclaration'.PHP_EOL;
+        $expected .= '  PSR1.Files.SideEffects'.PHP_EOL;
+        $expected .= '  PSR1.Methods.CamelCapsMethodName'.PHP_EOL.PHP_EOL;
+        $expected .= 'Squiz (1 sniff)'.PHP_EOL;
+        $expected .= '---------------'.PHP_EOL;
+        $expected .= '  Squiz.Classes.ValidClassName'.PHP_EOL;
+
+        $this->expectOutputString($expected);
+
+        $ruleset->explain();
+
+    }//end testExplain()
+
+
+}//end class