Identify time uncertainty for "etwa"

Close #37

src/NodaTimeSplitter.php

@@ -98,6 +98,7 @@ final class NodaTimeSplitter {
         ", ",
         " und ",
         "nach ",
+        "nach dem ",
         "um ",
         "ca.",
         "ab ",
@@ -831,6 +832,15 @@ final class NodaTimeSplitter {
             }
         }
 
+        if (\preg_match("/^(Nach dem|nach dem)\ /", $datum)) {
+            if (($spacePos = \strpos($datum, " ", 6)) === false) {
+                return false;
+            }
+            if ($output = self::attempt_splitting(\substr($datum, $spacePos))) {
+                return self::_turn_noda_split_time_to_after($output);
+            }
+        }
+
         if (\preg_match("/\ (\(nach|nach)$/", $datum)) {
             if (($spacePos = \strpos($datum, " ")) === false) {
                 return false;

src/NodaUncertaintyHelper.php

@@ -107,6 +107,8 @@ final class NodaUncertaintyHelper {
         "za. ",
         "~",
         "circa ",
+        "etwa ",
+        "Etwa ",
         "gegen ",
         "um ",
         "Um ",

tests/NodaTimeSplitterTest.php

@@ -776,6 +776,19 @@ final class NodaTimeSplitterTest extends TestCase {
         self::assertEquals($output->toTimeName(), "Vor 2020");
         self::assertEquals(NodaTimeSplitter::timePartsToCountingYear($output), 2020);
 
+        $output = NodaTimeSplitter::attempt_splitting("Nach dem 02.1.25 v. Chr");
+        self::assertNotEmpty($output);
+        self::assertEquals($output->toOldFormat(), [
+            0 => "-25",
+            1 => "?",
+            2 => "01",
+            3 => "02",
+            4 => "-",
+            5 => "Nach",
+        ]);
+        self::assertEquals($output->toTimeName(), "Nach 02.01.25 v. Chr.");
+        self::assertEquals(NodaTimeSplitter::timePartsToCountingYear($output), 25);
+
         $output = NodaTimeSplitter::attempt_splitting("Nach Januar 2020");
         self::assertNotEmpty($output);
         self::assertEquals($output->toOldFormat(), [

tests/NodaUncertaintyHelperTest.php

@@ -25,6 +25,7 @@ final class NodaUncertaintyHelperTest extends TestCase {
 
         return [
             'uncertainty prefix: "wohl 1950"' => ["wohl 1950", "1950", false],
+            'uncertainty prefix: "etwa 1950"' => ["etwa 1950", "1950", false],
             'uncertainty suffix: "1950?"' => ["1950?", "1950", false],
             'uncertainty suffix and superfluous chars: "1950 ?,"' => ["1950 ?,", "1950", false],
             'certain term with superfluous chars: "1950 ,"' => ["1950 ,", "1950", true],