!8 Add the support to parsing a null value.

From: @cherry530 
Reviewed-by: @lyn1001 
Signed-off-by: @lyn1001

Add-the-support-to-parsing-a-null-value.patch

@@ -0,0 +1,38 @@
+diff --git a/include/yaml-cpp/node/impl.h b/include/yaml-cpp/node/impl.h
+index 7a3deac..58ae529 100644
+--- a/include/yaml-cpp/node/impl.h
++++ b/include/yaml-cpp/node/impl.h
+@@ -112,8 +112,10 @@ template <typename S>
+ struct as_if<std::string, S> {
+   explicit as_if(const Node& node_) : node(node_) {}
+   const Node& node;
+-
++  
+   std::string operator()(const S& fallback) const {
++    if (node.Type() == NodeType::Null)
++      return "null";
+     if (node.Type() != NodeType::Scalar)
+       return fallback;
+     return node.Scalar();
+@@ -142,6 +144,8 @@ struct as_if<std::string, void> {
+   const Node& node;
+ 
+   std::string operator()() const {
++    if (node.Type() == NodeType::Null)
++      return "null";
+     if (node.Type() != NodeType::Scalar)
+       throw TypedBadConversion<std::string>(node.Mark());
+     return node.Scalar();
+diff --git a/test/integration/load_node_test.cpp b/test/integration/load_node_test.cpp
+index 4f4f28e..1fb8415 100644
+--- a/test/integration/load_node_test.cpp
++++ b/test/integration/load_node_test.cpp
+@@ -249,6 +249,8 @@ TEST(NodeTest, IncompleteJson) {
+ TEST(NodeTest, LoadTildeAsNull) {
+   Node node = Load("~");
+   ASSERT_TRUE(node.IsNull());
++  EXPECT_EQ(node.as<std::string>(), "null");
++  EXPECT_EQ(node.as<std::string>("~"), "null");
+ }
+     
+ TEST(NodeTest, LoadTagWithParenthesis) {

yaml-cpp.spec

@@ -1,11 +1,12 @@
 Name:               yaml-cpp
 Version:            0.6.3
-Release:            1
+Release:            2
 Summary:            A YAML parser and emitter in C++.
 License:            MIT
 URL:                https://github.com/jbeder/yaml-cpp
 Source0:            https://github.com/jbeder/yaml-cpp/archive/%{name}-%{version}.tar.gz
 Patch0001:          CVE-2017-5950.patch
+Patch0002:          Add-the-support-to-parsing-a-null-value.patch
 BuildRequires:      cmake gcc gcc-c++
 
 %description
@@ -68,5 +69,8 @@ cd -
 
 
 %changelog
+* Fri Jun 14 2024 xu_ping <707078654@qq.com> - 0.6.3-2
+- Add the support to parsing a null value.
+
 * Mon Jan 6 2020 Senlin Xia <xiasenlin1@huawei.com> - 0.6.3-1
 - Package init