add aliases validation

pkg/nip/file_reader.go

@@ -63,6 +63,10 @@ func ParseNIPFile(filePath string) (Rules, error) {
 			return nil, fmt.Errorf("error reading %s file at line %d: %w", filePath, lineNumber, err)
 		}
 
+		if err := rule.ValidateStats(); err != nil {
+			return nil, fmt.Errorf("error validating rule on [%s:%d]: %w", filePath, lineNumber, err)
+		}
+
 		// We evaluate all the rules at startup to ensure no format errors, if there is a format error we will throw it now instead of during runtime
 		_, err = rule.Evaluate(dummyItem)
 		if err != nil {

pkg/nip/rule.go

@@ -488,6 +488,16 @@ func getRequiredStatsForRule(line string) []string {
 	return statsList
 }
 
+// ValidateStats checks that all required stats in stage2 are valid aliases.
+func (r Rule) ValidateStats() error {
+	for _, statName := range r.requiredStats {
+		if _, found := statAliases[statName]; !found {
+			return fmt.Errorf("property %s is not valid or not supported", statName)
+		}
+	}
+	return nil
+}
+
 func evaluateClassSkillsSum(it data.Item) int {
 	// Check all class skills stats
 	totalClassSkills := 0