perf(JsonFixer): Improve readability of conditional statements

- Refactor conditional assignments for better clarity.
- Change variable assignment style in quickFix and other methods.
- Enhance code maintainability by ensuring consistent structure in if statements.

Author: ityaozm@gmail.com

app/Support/JsonFixer.php

@@ -89,7 +89,7 @@ public function fix(string $json): string
             return $json;
         }
 
-        if (null !== $tmpJson = $this->quickFix($json)) {
+        if (null !== ($tmpJson = $this->quickFix($json))) {
             return $tmpJson;
         }
 
@@ -139,7 +139,7 @@ private function isValid(string $json): bool
 
     private function quickFix(string $json): ?string
     {
-        if (1 === \strlen($json) && isset($this->pairs[$json])) {
+        if (isset($this->pairs[$json]) && 1 === \strlen($json)) {
             return $json.$this->pairs[$json];
         }
 
@@ -289,7 +289,7 @@ private function padLiteral(string $tmpJson): string
 
         $match = preg_match('/(tr?u?e?|fa?l?s?e?|nu?l?l?)$/', $tmpJson, $matches);
 
-        if (! $match || null === $literal = $this->maybeLiteral($matches[1])) {
+        if (! $match || null === ($literal = $this->maybeLiteral($matches[1]))) {
             return $tmpJson;
         }
 
@@ -314,7 +314,7 @@ private function padObject(string $tmpJson): string
         }
 
         $part = substr($tmpJson, $this->objectPos + 1);
-        if (preg_match('/(\s*\"[^"]+\"\s*:\s*[^,]+,?)+$/', $part, $matches)) {
+        if (preg_match('/(\s*\"[^"]+\"\s*:\s*[^,]+,?)+$/', $part)) {
             return $tmpJson;
         }