From 177a9e109885d69eb535c6c76efc9bbd23e8adc1 Mon Sep 17 00:00:00 2001
From: Daniel Alder <150253271+aldpuzz@users.noreply.github.com>
Date: Thu, 11 Sep 2025 13:51:46 +0200
Subject: [PATCH 1/2] Proposal for solving issue #379 (Issue with explicit_end
 set to False having no impact on small dump)

    #379: Issue with explicit_end set to False having no impact on small dump
---
 lib/yaml/emitter.py    | 2 +-
 lib/yaml/events.py     | 3 ++-
 lib/yaml/serializer.py | 2 +-
 3 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/yaml/emitter.py b/lib/yaml/emitter.py
index a664d0111..064468859 100644
--- a/lib/yaml/emitter.py
+++ b/lib/yaml/emitter.py
@@ -202,7 +202,7 @@ def expect_document_start(self, first=False):
                     self.write_indent()
             self.state = self.expect_document_root
         elif isinstance(self.event, StreamEndEvent):
-            if self.open_ended:
+            if self.open_ended and self.event.explicit_end:
                 self.write_indicator('...', True)
                 self.write_indent()
             self.write_stream_end()
diff --git a/lib/yaml/events.py b/lib/yaml/events.py
index f79ad389c..086b02c4e 100644
--- a/lib/yaml/events.py
+++ b/lib/yaml/events.py
@@ -40,7 +40,8 @@ def __init__(self, start_mark=None, end_mark=None, encoding=None):
         self.encoding = encoding
 
 class StreamEndEvent(Event):
-    pass
+    def __init__(self, explicit_end=None):
+        self.explicit_end = explicit_end
 
 class DocumentStartEvent(Event):
     def __init__(self, start_mark=None, end_mark=None,
diff --git a/lib/yaml/serializer.py b/lib/yaml/serializer.py
index fe911e67a..903e36562 100644
--- a/lib/yaml/serializer.py
+++ b/lib/yaml/serializer.py
@@ -37,7 +37,7 @@ def close(self):
         if self.closed is None:
             raise SerializerError("serializer is not opened")
         elif not self.closed:
-            self.emit(StreamEndEvent())
+            self.emit(StreamEndEvent(explicit_end=self.use_explicit_end))
             self.closed = True
 
     #def __del__(self):

From ae01a9bfc7378bbc81bd946e2d572a4144c41544 Mon Sep 17 00:00:00 2001
From: Daniel Alder <150253271+aldpuzz@users.noreply.github.com>
Date: Thu, 11 Sep 2025 14:13:24 +0200
Subject: [PATCH 2/2] Add test case for #379

---
 tests/legacy_tests/test_emitter.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tests/legacy_tests/test_emitter.py b/tests/legacy_tests/test_emitter.py
index 5eba0a37e..166d3c1a5 100644
--- a/tests/legacy_tests/test_emitter.py
+++ b/tests/legacy_tests/test_emitter.py
@@ -98,6 +98,14 @@ def test_emitter_events(events_filename, verbose=False):
     new_events = list(yaml.parse(output))
     _compare_events(events, new_events)
 
+def test_marks_on_primitives():
+    assert yaml.dump(42, explicit_start=False) == '42'
+    assert yaml.dump(42, explicit_start=True) == '--- 42'
+    assert yaml.dump(42, explicit_end=False) == '42'
+    assert yaml.dump(42, explicit_end=True) == '42\n...\n'
+    assert yaml.dump(42, explicit_start=False, explicit_end=False) == '42'
+    assert yaml.dump(42, explicit_start=True, explicit_end=True) == '--- 42\n...\n'
+
 if __name__ == '__main__':
     import test_appliance
     test_appliance.run(globals())