fix: revert removal of distribution methods

src/structure/components/com_sportsmanager/mathparser.php

@@ -209,10 +209,10 @@ class MathParser
     /**
      * Public for performance reasons.
      * @see getVariableResolver function for more info.
-     * @var string
+     * @var string|null
      * @since 1.0.0
      */
-    public string $VariableResolver;
+    public ?string $VariableResolver = null;
 
     /**
      * @ignore
@@ -325,10 +325,10 @@ class MathParser
      * the problem domain is too big to define the variables ahead of time. In such cases, it makes sense
      * to parse with the assumption that it is a valid variable and resolve it's value when needed on demand during
      * evaluation.
-     * @return string
+     * @return string|null
      * @since 1.0.0
      */
-    public function getVariableResolver(): string
+    public function getVariableResolver(): ?string
     {
         return $this->VariableResolver;
     }
@@ -493,7 +493,7 @@ class MathParser
                 throw new Exception($this->getMessage1("NtVarNm", $varName));
             }
             //create the variable:
-            $var = new Mathparser_Variable($upcName, $newVal, $fn_valueProvider);
+            $var = new Mathparser_Variable($this, $upcName, $newVal, $fn_valueProvider);
             $this->Variables[$upcName] = $var;
             $this->Dirty = true;
         }
@@ -1824,6 +1824,12 @@ class MathParser
 class Mathparser_Variable
 {
 
+    /**
+     * The parent parser instance, used to call the VariableResolver if needed.
+     * @since 1.0.0
+     */
+    private $Parser;
+
     /**
      * Name of this variable.
      * @since 1.0.0
@@ -1843,10 +1849,21 @@ class Mathparser_Variable
      * <br /><br />    function VariableResolver($parser, $varName);<br /><br />
      * @since 1.0.0
      */
-    public string $ValueProvider;
+    public $ValueProvider;
 
-    public function __construct($aName, $newVal, $valueProvider)
+    /**
+     * If the $this->ValueProvider is set, then this method uses it to get the runtime value.
+     * Otherwise, this method returns the value of $this->Value;
+     * @since 1.0.0
+     * @noinspection PhpUnused
+     */
+    public function getRuntimeValue(){
+        return !is_callable($this->ValueProvider) ? $this->Value : ($this->ValueProvider)($this->Parser, $this->Name);
+    }
+
+    public function __construct($parser, $aName, $newVal, $valueProvider)
     {
+        $this->Parser = $parser;
         $this->Name = $aName;
         $this->Value = $newVal;
         $this->ValueProvider = $valueProvider;