Enhance input validation in ShieldsIo class (#215)

* Update ShieldsIo.php

* style: format code with PHP CS Fixer

This commit fixes the style issues introduced in fdd8858 according to the output
from PHP CS Fixer.

Details: #215

* Update ShieldsIo.php

* Update ShieldsIo.php

* Update ShieldsIo.php

---------

Co-authored-by: deepsource-autofix[bot] <62050782+deepsource-autofix[bot]@users.noreply.github.com>

src/ShieldsIo.php

@@ -15,36 +15,32 @@ private function encodeShieldsIoParameters($input)
  return $input;
  }
 
- public function generateBadgeUrl($label, $content, $color, $style, $labelColor, $logo)
+ private function addComponent($component, &$badge)
  {
- $badge = array();
-
- if (isset($label) && !empty($label)) {
- $label = $this->encodeShieldsIoParameters($label);
- $badge[] = $label;
- }
-
- if (isset($content) && !empty($content)) {
- $content = $this->encodeShieldsIoParameters($content);
- $badge[] = $content;
- }
-
- if (isset($color) && !empty($color)) {
- $badge[] = $color;
- }
-
- $queryString = array();
- if (isset($style) && !empty($style)) {
- $queryString["style"] = $style;
+ if (isset($component) && (empty($component) === false || $component === 0)) {
+ $value = $this->encodeShieldsIoParameters($component);
+ $badge[] = $value;
  }
+ }
 
- if (isset($labelColor) && !empty($labelColor)) {
- $queryString["labelColor"] = $labelColor;
+ private function addQueryString($component, $key, &$queryString)
+ {
+ if (isset($component) && empty($component) === false) {
+ $queryString[$key] = $component;
  }
+ }
 
- if (isset($logo) && !empty($logo)) {
- $queryString["logo"] = $logo;
- }
+ public function generateBadgeUrl($label, $content, $color, $style, $labelColor, $logo)
+ {
+ $badge = [];
+ $this->addComponent($label, $badge);
+ $this->addComponent($content, $badge);
+ $this->addComponent($color, $badge);
+
+ $queryString = [];
+ $this->addQueryString($style, "style", $queryString);
+ $this->addQueryString($labelColor, "labelColor", $queryString);
+ $this->addQueryString($logo, "logo", $queryString);
 
  return "https://img.shields.io/badge/" . implode("-", $badge) . "?" . http_build_query($queryString);
  }