[VarDumper][HttpKernel] Fix dumping with labels

Author: nicolas-grekas

Cloner/Data.php

@@ -271,7 +271,11 @@ public function dump(DumperInterface $dumper)
         $cursor = new Cursor();
         $cursor->hashType = -1;
         $cursor->attr = $this->context[SourceContextProvider::class] ?? [];
-        $dumper->dumpScalar($cursor, 'label', $this->context['label'] ?? '');
+        $label = $this->context['label'] ?? '';
+
+        if ($cursor->attr || '' !== $label) {
+            $dumper->dumpScalar($cursor, 'label', $label);
+        }
         $cursor->hashType = 0;
         $this->dumpItem($dumper, $cursor, $refs, $this->data[$this->position][$this->key]);
     }

Dumper/CliDumper.php

@@ -139,8 +139,14 @@ public function dumpScalar(Cursor $cursor, string $type, string|int|float|bool|n
         $attr = $cursor->attr;
 
         switch ($type) {
-            case 'label': $style = 'label'; break;
-            case 'default': $style = 'default'; break;
+            case 'default':
+                $style = 'default';
+                break;
+
+            case 'label':
+                $this->styles += ['label' => $this->styles['default']];
+                $style = 'label';
+                break;
 
             case 'integer':
                 $style = 'num';
@@ -467,7 +473,7 @@ protected function style(string $style, string $value, array $attr = []): string
 
         $map = static::$controlCharsMap;
         $startCchr = $this->colors ? "\033[m\033[{$this->styles['default']}m" : '';
-        $endCchr = $this->colors ? "\033[m\033[{$this->styles['label' === $style ? 'default' : $style]}m" : '';
+        $endCchr = $this->colors ? "\033[m\033[{$this->styles[$style]}m" : '';
         $value = preg_replace_callback(static::$controlCharsRx, function ($c) use ($map, $startCchr, $endCchr) {
             $s = $startCchr;
             $c = $c[$i = 0];
@@ -490,7 +496,7 @@ protected function style(string $style, string $value, array $attr = []): string
             if ($cchrCount && "\033" === $value[0]) {
                 $value = substr($value, \strlen($startCchr));
             } else {
-                $value = "\033[{$this->styles['label' === $style ? 'default' : $style]}m".$value;
+                $value = "\033[{$this->styles[$style]}m".$value;
             }
             if ($cchrCount && str_ends_with($value, $endCchr)) {
                 $value = substr($value, 0, -\strlen($endCchr));

Dumper/HtmlDumper.php

@@ -903,7 +903,7 @@ protected function style(string $style, string $value, array $attr = []): string
         }
 
         $map = static::$controlCharsMap;
-        $v = '<span class=sf-dump-'.('label' === $style ? 'default' : $style).'>'.preg_replace_callback(static::$controlCharsRx, function ($c) use ($map) {
+        $v = "<span class=sf-dump-{$style}>".preg_replace_callback(static::$controlCharsRx, function ($c) use ($map) {
             $s = $b = '<span class="sf-dump-default';
             $c = $c[$i = 0];
             if ($ns = "\r" === $c[$i] || "\n" === $c[$i]) {
@@ -944,6 +944,9 @@ protected function style(string $style, string $value, array $attr = []): string
         if (isset($attr['lang'])) {
             $v = sprintf('<code class="%s">%s</code>', esc($attr['lang']), $v);
         }
+        if ('label' === $style) {
+            $v .= ' ';
+        }
 
         return $v;
     }