Merge pull request #387 from gregsdennis/yaml/back2yaml

add back-to-yaml functionality

Yaml2JsonNode/Yaml2JsonNode.csproj

@@ -4,9 +4,9 @@
     <TargetFramework>netstandard2.0</TargetFramework>
 	  <PackageId>Yaml2JsonNode</PackageId>
 	  <Authors>Greg Dennis</Authors>
-	  <Version>1.0.0</Version>
+	  <Version>1.1.0</Version>
 	  <AssemblyVersion>1.0.0.0</AssemblyVersion>
-	  <FileVersion>1.0.0.0</FileVersion>
+	  <FileVersion>1.1.0.0</FileVersion>
 	  <Description>Allows conversion of YamlDotNet's YAML models to JsonNodes.</Description>
 	  <PackageLicenseFile>LICENSE</PackageLicenseFile>
 	  <PackageProjectUrl>https://github.com/gregsdennis/json-everything</PackageProjectUrl>
@@ -34,7 +34,7 @@
 	</ItemGroup>
 
 	<ItemGroup>
-		<None Include="..\json-everything.net\wwwroot\md\release-notes\json-yaml.md" Link="json-yaml.md" />
+		<None Include="..\json-everything.net\wwwroot\md\release-notes\yaml.md" Link="yaml.md" />
 		<None Include="..\LICENSE">
 			<Pack>True</Pack>
 			<PackagePath></PackagePath>

Yaml2JsonNode/YamlConverter.cs

@@ -49,6 +49,23 @@ public static JsonNode ToJsonNode(this YamlNode yaml)
 		};
 	}
 
+	/// <summary>
+	/// Converts a single JSON node to a <see cref="YamlNode"/>.
+	/// </summary>
+	/// <param name="json"></param>
+	/// <returns></returns>
+	/// <exception cref="NotSupportedException"></exception>
+	public static YamlNode ToYamlNode(this JsonNode json)
+	{
+		return json switch
+		{
+			JsonObject obj => obj.ToYamlMapping(),
+			JsonArray arr => arr.ToYamlSequence(),
+			JsonValue val => val.ToYamlScalar(),
+			_ => throw new NotSupportedException("This isn't a supported JsonNode")
+		};
+	}
+
 	private static JsonObject ToJsonObject(this YamlMappingNode yaml)
 	{
 		var node = new JsonObject();
@@ -61,6 +78,11 @@ private static JsonObject ToJsonObject(this YamlMappingNode yaml)
 		return node;
 	}
 
+	private static YamlMappingNode ToYamlMapping(this JsonObject obj)
+	{
+		return new YamlMappingNode(obj.ToDictionary(x => (YamlNode)new YamlScalarNode(x.Key), x => x.Value.ToYamlNode()));
+	}
+
 	private static JsonArray ToJsonArray(this YamlSequenceNode yaml)
 	{
 		var node = new JsonArray();
@@ -72,6 +94,11 @@ private static JsonArray ToJsonArray(this YamlSequenceNode yaml)
 		return node;
 	}
 
+	private static YamlSequenceNode ToYamlSequence(this JsonArray arr)
+	{
+		return new YamlSequenceNode(arr.Select(x => x.ToYamlNode()));
+	}
+
 	private static JsonValue ToJsonValue(this YamlScalarNode yaml)
 	{
 		switch (yaml.Style)
@@ -92,4 +119,9 @@ private static JsonValue ToJsonValue(this YamlScalarNode yaml)
 				throw new ArgumentOutOfRangeException();
 		}
 	}
+
+	private static YamlScalarNode ToYamlScalar(this JsonValue val)
+	{
+		return new YamlScalarNode(val.ToJsonString());
+	}
 }

json-everything.net/wwwroot/md/release-notes/yaml.md

@@ -1,3 +1,7 @@
+# [1.1.0](https://github.com/gregsdennis/json-everything/pull/387)
+
+[#381](https://github.com/gregsdennis/json-everything/issues/381) - Adds conversions from `JsonNode` back to YAML.
+
 # [1.0.0](https://github.com/gregsdennis/json-everything/pull/358)
 
 Initial release.

json-everything.net/wwwroot/md/yaml.md

@@ -1,4 +1,4 @@
-Yaml2JsonNode is pretty simple: it converts models of YAML text that has been parsed by YamlDotNet into `JsonNode`s.  That's it.
+Yaml2JsonNode is pretty simple: it converts models of YAML text that has been parsed by YamlDotNet into `JsonNode`s (and can also convert `JsonNode`s back into `YamlNode`s).  That's it.
 
 ## Why?
 
@@ -36,3 +36,7 @@ var specificJsonNode = specificYamlNode.ToJsonNode();
 ```
 
 There's really not much to this.  Just remember one method: `.ToJsonNode()`.  It'll take care of you.
+
+If you want to go back to YAML for some reason, `.ToYamlNode()` is your friend.
+
+***NOTE** This library will get JSON into the `YamlNode` model.  You'll need to understand how to get that back into a string using YamlDotNet.  Link to their docs above.*