More types for static analysis

src/FactorGraphs/FactorGraphLayer.php

@@ -60,14 +60,14 @@ abstract class FactorGraphLayer
         $this->localFactors[] = $factor;
     }
 
-    abstract public function buildLayer();
+    abstract public function buildLayer(): void;
 
-    public function createPriorSchedule()
+    public function createPriorSchedule(): ?ScheduleSequence
     {
         return null;
     }
 
-    public function createPosteriorSchedule()
+    public function createPosteriorSchedule(): ?ScheduleSequence
     {
         return null;
     }

src/RankSorter.php

@@ -10,9 +10,9 @@ class RankSorter
     /**
      * Performs an in-place sort of the items in according to the ranks in non-decreasing order.
      *
-     * @param  array $teams     The items to sort according to the order specified by ranks.
-     * @param  array $teamRanks The ranks for each item where 1 is first place.
-     * @return array
+     * @param  array<mixed> $teams     The items to sort according to the order specified by ranks.
+     * @param  array<int> $teamRanks The ranks for each item where 1 is first place.
+     * @return array<array>
      */
     public static function sort(array &$teams, array &$teamRanks): array
     {

src/TrueSkill/Factors/GaussianWeightedSumFactor.php

@@ -198,8 +198,7 @@ class GaussianWeightedSumFactor extends GaussianFactor
         // The tricky part here is that we have to put the messages and variables in the same
         // order as the weights. Thankfully, the weights and messages share the same index numbers,
         // so we just need to make sure they're consistent
-        $allMessagesCount = is_countable($allMessages) ? count($allMessages) : 0;
-        for ($i = 0; $i < $allMessagesCount; $i++) {
+        for ($i = 0; $i < count($allMessages); $i++) {
             $updatedMessages[] = $allMessages[$indicesToUse[$i]];
             $updatedVariables[] = $allVariables[$indicesToUse[$i]];
         }

src/TrueSkill/Layers/IteratedTeamDifferencesInnerLayer.php

@@ -38,7 +38,7 @@ class IteratedTeamDifferencesInnerLayer extends TrueSkillFactorGraphLayer
         $this->TeamDifferencesComparisonLayer->buildLayer();
     }
 
-    public function createPriorSchedule(): ScheduleSequence
+    public function createPriorSchedule(): ?ScheduleSequence
     {
         switch (is_countable($this->getInputVariablesGroups()) ? count($this->getInputVariablesGroups()) : 0) {
             case 0:
@@ -78,7 +78,7 @@ class IteratedTeamDifferencesInnerLayer extends TrueSkillFactorGraphLayer
         );
     }
 
-    private function createTwoTeamInnerPriorLoopSchedule()
+    private function createTwoTeamInnerPriorLoopSchedule(): ScheduleSequence
     {
         $teamPerformancesToTeamPerformanceDifferencesLayerLocalFactors = $this->TeamPerformancesToTeamPerformanceDifferencesLayer->getLocalFactors();
         $teamDifferencesComparisonLayerLocalFactors = $this->TeamDifferencesComparisonLayer->getLocalFactors();
@@ -104,9 +104,9 @@ class IteratedTeamDifferencesInnerLayer extends TrueSkillFactorGraphLayer
         );
     }
 
-    private function createMultipleTeamInnerPriorLoopSchedule()
+    private function createMultipleTeamInnerPriorLoopSchedule(): ScheduleLoop
     {
-        $totalTeamDifferences = is_countable($this->TeamPerformancesToTeamPerformanceDifferencesLayer->getLocalFactors()) ? count($this->TeamPerformancesToTeamPerformanceDifferencesLayer->getLocalFactors()) : 0;
+        $totalTeamDifferences = count($this->TeamPerformancesToTeamPerformanceDifferencesLayer->getLocalFactors());
 
         $forwardScheduleList = [];
 

src/TrueSkill/Layers/PlayerPerformancesToTeamPerformancesLayer.php

@@ -26,7 +26,7 @@ class PlayerPerformancesToTeamPerformancesLayer extends TrueSkillFactorGraphLaye
         }
     }
 
-    public function createPriorSchedule(): ScheduleSequence
+    public function createPriorSchedule(): ?ScheduleSequence
     {
         $localFactors = $this->getLocalFactors();
 
@@ -57,7 +57,7 @@ class PlayerPerformancesToTeamPerformancesLayer extends TrueSkillFactorGraphLaye
         );
     }
 
-    public function createPosteriorSchedule(): ScheduleSequence
+    public function createPosteriorSchedule(): ?ScheduleSequence
     {
         $allFactors = [];
         $localFactors = $this->getLocalFactors();

src/TrueSkill/Layers/PlayerPriorValuesToSkillsLayer.php

@@ -42,7 +42,7 @@ class PlayerPriorValuesToSkillsLayer extends TrueSkillFactorGraphLayer
         }
     }
 
-    public function createPriorSchedule(): ScheduleSequence
+    public function createPriorSchedule(): ?ScheduleSequence
     {
         $localFactors = $this->getLocalFactors();
 

src/TrueSkill/Layers/PlayerSkillsToPerformancesLayer.php

@@ -45,7 +45,7 @@ class PlayerSkillsToPerformancesLayer extends TrueSkillFactorGraphLayer
         return $this->getParentFactorGraph()->getVariableFactory()->createKeyedVariable($key, $key . "'s performance");
     }
 
-    public function createPriorSchedule(): ScheduleSequence
+    public function createPriorSchedule(): ?ScheduleSequence
     {
         $localFactors = $this->getLocalFactors();
 
@@ -58,7 +58,7 @@ class PlayerSkillsToPerformancesLayer extends TrueSkillFactorGraphLayer
         );
     }
 
-    public function createPosteriorSchedule(): ScheduleSequence
+    public function createPosteriorSchedule(): ?ScheduleSequence
     {
         $localFactors = $this->getLocalFactors();