Validate against time errors in autogenerating translations for times

Close #30

src/NodaTimeAutotranslater.php

@@ -13,7 +13,7 @@ final class NodaTimeAutotranslater {
 
     // TODO: Move these to NodaTimeAutotranslaterLocales
 
-    const LANGS_SYLLABLE_CLEANING = [
+    public const LANGS_SYLLABLE_CLEANING = [
         "hu" => [
             "10-as évek" => "10-es évek",
             "40-as évek" => "40-es évek",
@@ -463,13 +463,13 @@ final class NodaTimeAutotranslater {
     }
 
     /**
-     * Gets translations for a given entry type.
+     * Prepares translations for each available language.
      *
      * @param array<integer|string> $timeInfo Time information.
      *
      * @return array<string>
      */
-    public static function getTranslations(array $timeInfo):array {
+    public static function prepareTranslations(array $timeInfo):array {
 
         if (!empty($timeInfo['zeit_name']) and strlen((string)$timeInfo['zeit_name']) > 10 and !empty($timespanDates = NodaTimeSplitter::attempt_splitting_from_till((string)$timeInfo['zeit_name']))) {
 
@@ -604,6 +604,78 @@ final class NodaTimeAutotranslater {
 
     }
 
+    /**
+     * Validates correctness of years in translation strings.
+     *
+     * @param string|integer        $start        Start year.
+     * @param string|integer        $end          End year.
+     * @param array<string, string> $translations Translations.
+     *
+     * @return boolean
+     */
+    public static function validateTranslations(string|int $start, string|int $end, array $translations):bool {
+
+        $start = ltrim((string)$start, ' 0-');
+        $end = ltrim((string)$end, ' 0-');
+
+        // Edge cases: Centuries and decades have special translations
+        // and can thus not be validated properly
+        // Century BCE
+        if (substr($start, -1) === "0" && substr($end, -1) === '1' && $start > $end) {
+            return true;
+        }
+        // Century CE
+        if (substr($start, -1) === "1" && substr($end, -1) === '0' && $start < $end) {
+            return true;
+        }
+        // Decade
+        if (substr($start, -1) === "0" && substr($end, -1) === '9' && $start < $end) {
+            return true;
+        }
+
+        // 1920 + ? can be both Since 1920 and After 1919, so validation
+        // is impossible there, too
+        if ($start === '?' || $end === '?') return true;
+
+        // Unset unvalidatable languages
+        unset($translations['ar'], $translations['fa']);
+
+        if ($start !== '?') {
+            foreach ($translations as $t) {
+                if (!str_contains($t, $start)) {
+                    return false;
+                }
+            }
+        }
+        if ($end !== '?' && $start !== $end) {
+            foreach ($translations as $t) {
+                if (!str_contains($t, $end)) {
+                    return false;
+                }
+            }
+        }
+
+        return true;
+
+    }
+
+    /**
+     * Gets translations for a given entry type.
+     *
+     * @param array<integer|string> $timeInfo Time information.
+     *
+     * @return array<string>
+     */
+    public static function getTranslations(array $timeInfo):array {
+
+        $output = self::prepareTranslations($timeInfo);
+
+        if (self::validateTranslations($timeInfo['zeit_beginn'], $timeInfo['zeit_ende'], $output) === false) return [];
+
+        return $output;
+
+    }
+
     /**
      * Runs autotranslater.
      *