Add a new UseFlowStyle option

This option allows the output of sequences and mapping using the
Flow style instead of the Block style.

Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>

Author: gabriel-samfira

lib/net47/PowerShellYamlSerializer.dll

@@ -23,6 +23,7 @@ enum SerializationOptions {
     DefaultToStaticType = 16
     WithIndentedSequences = 32
     OmitNullValues = 64
+    UseFlowStyle = 128
 }
 $here = Split-Path -Parent $MyInvocation.MyCommand.Path
 $infinityRegex = [regex]::new('^[-+]?(\.inf|\.Inf|\.INF)$', "Compiled, CultureInvariant");
@@ -413,9 +414,10 @@ function Get-Serializer {
     }
 
     $omitNull = $Options.HasFlag([SerializationOptions]::OmitNullValues)
+    $useFlowStyle = $Options.HasFlag([SerializationOptions]::UseFlowStyle)
 
-    $stringQuoted = $stringQuotedAssembly.GetType("StringQuotingEmitter")
-    $builder = $stringQuoted::Add($builder, $omitNull)
+    $stringQuoted = $stringQuotedAssembly.GetType("BuilderUtils")
+    $builder = $stringQuoted::BuildSerializer($builder, $omitNull, $useFlowStyle)
 
     return $builder.Build()
 }
@@ -433,6 +435,7 @@ function ConvertTo-Yaml {
 
         [Parameter(ParameterSetName = 'NoOptions')]
         [switch]$JsonCompatible,
+        [switch]$UseFlowStyle,
 
         [switch]$KeepArray,
 

lib/netstandard2.1/PowerShellYamlSerializer.dll

@@ -117,8 +117,24 @@ public override void Emit(ScalarEventInfo eventInfo, IEmitter emitter) {
 
         base.Emit(eventInfo, emitter);
     }
-    // objectGraphVisitor, w => w.OnTop()
-    public static SerializerBuilder Add(SerializerBuilder builder, bool omitNullValues = false) {
+}
+
+public class FlowStyleEmitter: ChainedEventEmitter {
+    public FlowStyleEmitter(IEventEmitter next): base(next) {}
+
+    public override void Emit(MappingStartEventInfo eventInfo, IEmitter emitter) {
+        eventInfo.Style = MappingStyle.Flow;
+        base.Emit(eventInfo, emitter);
+    }
+
+    public override void Emit(SequenceStartEventInfo eventInfo, IEmitter emitter){
+        eventInfo.Style = SequenceStyle.Flow;
+        nextEmitter.Emit(eventInfo, emitter);
+    }
+}
+
+class BuilderUtils {
+    public static SerializerBuilder BuildSerializer(SerializerBuilder builder, bool omitNullValues = false, bool useFlowStyle = false) {
         builder = builder
             .WithEventEmitter(next => new StringQuotingEmitter(next))
             .WithTypeConverter(new BigIntegerTypeConverter())
@@ -127,6 +143,9 @@ public static SerializerBuilder Add(SerializerBuilder builder, bool omitNullValu
             builder = builder
                 .WithEmissionPhaseObjectGraphVisitor(args => new NullValueGraphVisitor(args.InnerVisitor));
         }
+        if (useFlowStyle == true) {
+            builder = builder.WithEventEmitter(next => new FlowStyleEmitter(next));
+        }
         return builder;
     }
 }