Generic/OpeningFunctionBraceKernighanRitchie: improve error message

src/Standards/Generic/Sniffs/Functions/OpeningFunctionBraceKernighanRitchieSniff.php

@@ -138,22 +138,26 @@ public function process(File $phpcsFile, $stackPtr)
             return;
         }
 
-        // We are looking for tabs, even if they have been replaced, because
-        // we enforce a space here.
-        if (isset($tokens[($openingBrace - 1)]['orig_content']) === true) {
-            $spacing = $tokens[($openingBrace - 1)]['orig_content'];
-        } else {
-            $spacing = $tokens[($openingBrace - 1)]['content'];
-        }
-
+        // Enforce a single space. Tabs not allowed.
+        $spacing = $tokens[($openingBrace - 1)]['content'];
         if ($tokens[($openingBrace - 1)]['code'] !== T_WHITESPACE) {
             $length = 0;
         } else if ($spacing === "\t") {
+            // Tab without tab-width set, so no tab replacement has taken place.
             $length = '\t';
         } else {
             $length = strlen($spacing);
         }
 
+        // If tab replacement is on, avoid confusing the user with a "expected 1 space, found 1"
+        // message when the "1" found is actually a tab, not a space.
+        if ($length === 1
+            && isset($tokens[($openingBrace - 1)]['orig_content']) === true
+            && $tokens[($openingBrace - 1)]['orig_content'] === "\t"
+        ) {
+            $length = '\t';
+        }
+
         if ($length !== 1) {
             $error = 'Expected 1 space before opening brace; found %s';
             $data  = [$length];

src/Standards/Generic/Tests/Functions/OpeningFunctionBraceKernighanRitchieUnitTest.2.inc

@@ -9,3 +9,11 @@ function myFunction()	{
 // Uses three tabs.
 function myFunction()			{
 }
+
+// Uses one tab in a way that it translates to exactly one space with tab replacement.
+function oneT()	{
+}
+
+// Mixed tabs and spaces.
+function mixed()	  	{
+}

src/Standards/Generic/Tests/Functions/OpeningFunctionBraceKernighanRitchieUnitTest.2.inc.fixed

@@ -9,3 +9,11 @@ function myFunction() {
 // Uses three tabs.
 function myFunction() {
 }
+
+// Uses one tab in a way that it translates to exactly one space with tab replacement.
+function oneT() {
+}
+
+// Mixed tabs and spaces.
+function mixed() {
+}

src/Standards/Generic/Tests/Functions/OpeningFunctionBraceKernighanRitchieUnitTest.php

@@ -88,6 +88,8 @@ public function getErrorList($testFile='')
             return [
                 6  => 1,
                 10 => 1,
+                14 => 1,
+                18 => 1,
             ];
         default:
             return [];