From ab4f686a0098a25f6d2da2c67746aad1426a200c Mon Sep 17 00:00:00 2001
From: Joao Paulo Magalhaes <dev@jpmag.me>
Date: Sat, 22 Feb 2025 14:48:09 +0000
Subject: [PATCH] fix missing tag for flow seqs

---
 changelog/current.md             |   4 ++
 src/c4/yml/parse_engine.def.hpp  |   1 +
 test/test_parse_engine_5_tag.cpp | 104 +++++++++++++++++++++++++++++++
 3 files changed, 109 insertions(+)

diff --git a/changelog/current.md b/changelog/current.md
index e69de29bb..e81e4f38e 100644
--- a/changelog/current.md
+++ b/changelog/current.md
@@ -0,0 +1,4 @@
+
+## Fixes
+
+- [PR#501](https://github.com/biojppm/rapidyaml/pull/501): fix missing tag in `- !!seq []`
diff --git a/src/c4/yml/parse_engine.def.hpp b/src/c4/yml/parse_engine.def.hpp
index c46d62c62..25d26f2ac 100644
--- a/src/c4/yml/parse_engine.def.hpp
+++ b/src/c4/yml/parse_engine.def.hpp
@@ -5801,6 +5801,7 @@ void ParseEngine<EventHandler>::_handle_seq_block()
         {
             _c4dbgp("seqblck[RVAL]: start child seqflow");
             addrem_flags(RNXT, RVAL);
+            _handle_annotations_before_blck_val_scalar();
             m_evt_handler->begin_seq_val_flow();
             addrem_flags(FLOW|RVAL, BLCK|RNXT);
             _line_progressed(1);
diff --git a/test/test_parse_engine_5_tag.cpp b/test/test_parse_engine_5_tag.cpp
index 540deaf27..8f0ac5bb1 100644
--- a/test/test_parse_engine_5_tag.cpp
+++ b/test/test_parse_engine_5_tag.cpp
@@ -517,6 +517,110 @@ ENGINE_TEST_ERR(DirectiveMultipleYAML_3,
                 "---\n"
                 "bar")
 
+
+//-----------------------------------------------------------------------------
+
+ENGINE_TEST(TagEmptySeq0,
+            ("!!seq []\n", "!!seq []"),
+            "+STR\n+DOC\n+SEQ [] <tag:yaml.org,2002:seq>\n-SEQ\n-DOC\n-STR\n")
+{
+    ___(ps.begin_stream());
+    ___(ps.begin_doc());
+    ___(ps.set_val_tag("!!seq"));
+    ___(ps.begin_seq_val_flow());
+    ___(ps.end_seq());
+    ___(ps.end_doc());
+    ___(ps.end_stream());
+}
+
+ENGINE_TEST(TagEmptySeq1,
+            (""
+             "- !!seq []\n"
+             ""),
+            "+STR\n+DOC\n+SEQ\n+SEQ [] <tag:yaml.org,2002:seq>\n-SEQ\n-SEQ\n-DOC\n-STR\n")
+{
+    ___(ps.begin_stream());
+    ___(ps.begin_doc());
+    ___(ps.begin_seq_val_block());
+    ___(ps.set_val_tag("!!seq"));
+    ___(ps.begin_seq_val_flow());
+    ___(ps.end_seq());
+    ___(ps.end_seq());
+    ___(ps.end_doc());
+    ___(ps.end_stream());
+}
+
+ENGINE_TEST(TagEmptySeq2,
+            (""
+             "!!seq\n"
+             "- !!seq []\n"
+             ""),
+            "+STR\n+DOC\n+SEQ <tag:yaml.org,2002:seq>\n+SEQ [] <tag:yaml.org,2002:seq>\n-SEQ\n-SEQ\n-DOC\n-STR\n")
+{
+    ___(ps.begin_stream());
+    ___(ps.begin_doc());
+    ___(ps.set_val_tag("!!seq"));
+    ___(ps.begin_seq_val_block());
+    ___(ps.set_val_tag("!!seq"));
+    ___(ps.begin_seq_val_flow());
+    ___(ps.end_seq());
+    ___(ps.end_seq());
+    ___(ps.end_doc());
+    ___(ps.end_stream());
+}
+
+
+//-----------------------------------------------------------------------------
+
+ENGINE_TEST(TagEmptyMap0,
+            ("!!map {}\n", "!!map {}"),
+            "+STR\n+DOC\n+MAP {} <tag:yaml.org,2002:map>\n-MAP\n-DOC\n-STR\n")
+{
+    ___(ps.begin_stream());
+    ___(ps.begin_doc());
+    ___(ps.set_val_tag("!!map"));
+    ___(ps.begin_map_val_flow());
+    ___(ps.end_map());
+    ___(ps.end_doc());
+    ___(ps.end_stream());
+}
+
+ENGINE_TEST(TagEmptyMap1,
+            (""
+             "- !!map {}\n"
+             ""),
+            "+STR\n+DOC\n+SEQ\n+MAP {} <tag:yaml.org,2002:map>\n-MAP\n-SEQ\n-DOC\n-STR\n")
+{
+    ___(ps.begin_stream());
+    ___(ps.begin_doc());
+    ___(ps.begin_seq_val_block());
+    ___(ps.set_val_tag("!!map"));
+    ___(ps.begin_map_val_flow());
+    ___(ps.end_map());
+    ___(ps.end_seq());
+    ___(ps.end_doc());
+    ___(ps.end_stream());
+}
+
+ENGINE_TEST(TagEmptyMap2,
+            (""
+             "!!seq\n"
+             "- !!map {}\n"
+             ""),
+            "+STR\n+DOC\n+SEQ <tag:yaml.org,2002:seq>\n+MAP {} <tag:yaml.org,2002:map>\n-MAP\n-SEQ\n-DOC\n-STR\n")
+{
+    ___(ps.begin_stream());
+    ___(ps.begin_doc());
+    ___(ps.set_val_tag("!!seq"));
+    ___(ps.begin_seq_val_block());
+    ___(ps.set_val_tag("!!map"));
+    ___(ps.begin_map_val_flow());
+    ___(ps.end_map());
+    ___(ps.end_seq());
+    ___(ps.end_doc());
+    ___(ps.end_stream());
+}
+
 } // namespace yml
 } // namespace c4