| | | 1 | | using System.Collections; |
| | | 2 | | using System.Management.Automation; |
| | | 3 | | using YamlDotNet.Core; |
| | | 4 | | using YamlDotNet.Core.Events; |
| | | 5 | | using YamlDotNet.Serialization; |
| | | 6 | | |
| | | 7 | | namespace Kestrun.Utilities.Yaml; |
| | | 8 | | |
| | | 9 | | /// <summary> |
| | | 10 | | /// YAML type converter for PSObject types |
| | | 11 | | /// </summary> |
| | | 12 | | /// <param name="omitNullValues">If true, null values will be omitted from the output</param> |
| | | 13 | | /// <param name="useFlowStyle">If true, the mapping will be emitted in flow style</param> |
| | 32 | 14 | | public class PSObjectTypeConverter(bool omitNullValues = false, bool useFlowStyle = false) : IYamlTypeConverter |
| | | 15 | | { |
| | 32 | 16 | | private readonly bool omitNullValues = omitNullValues; |
| | 32 | 17 | | private readonly bool useFlowStyle = useFlowStyle; |
| | | 18 | | |
| | | 19 | | /// <summary> |
| | | 20 | | /// Check if the type is PSObject |
| | | 21 | | /// </summary> |
| | | 22 | | /// <param name="type">The type to check</param> |
| | | 23 | | /// <returns>true if the type is PSObject; otherwise, false.</returns> |
| | 177 | 24 | | public bool Accepts(Type type) => typeof(PSObject).IsAssignableFrom(type); |
| | | 25 | | |
| | | 26 | | /// <summary> |
| | | 27 | | /// Read a PSObject from YAML |
| | | 28 | | /// </summary> |
| | | 29 | | /// <param name="parser">The YAML parser</param> |
| | | 30 | | /// <param name="type">The target type</param> |
| | | 31 | | /// <param name="rootDeserializer">The root deserializer</param> |
| | | 32 | | /// <returns>The deserialized PSObject</returns> |
| | | 33 | | public object ReadYaml(IParser parser, Type type, ObjectDeserializer rootDeserializer) |
| | | 34 | | { |
| | | 35 | | // We don't really need to do any custom deserialization. |
| | 0 | 36 | | var deserialized = rootDeserializer(typeof(IDictionary<string, object>)) as IDictionary; |
| | | 37 | | // Use PSObject.AsPSObject to avoid wrapping an already wrapped PSObject and to safely handle null values. |
| | 0 | 38 | | return PSObject.AsPSObject(deserialized ?? new Hashtable()); |
| | | 39 | | } |
| | | 40 | | |
| | | 41 | | /// <summary> |
| | | 42 | | /// Write a PSObject to YAML |
| | | 43 | | /// </summary> |
| | | 44 | | /// <param name="emitter">The YAML emitter</param> |
| | | 45 | | /// <param name="value">The PSObject to serialize</param> |
| | | 46 | | /// <param name="type">The target type</param> |
| | | 47 | | /// <param name="serializer">The object serializer</param> |
| | | 48 | | public void WriteYaml(IEmitter emitter, object? value, Type type, ObjectSerializer serializer) |
| | | 49 | | { |
| | 11 | 50 | | if (value is null) |
| | | 51 | | { |
| | 0 | 52 | | EmitNull(serializer); |
| | 0 | 53 | | return; |
| | | 54 | | } |
| | | 55 | | |
| | 11 | 56 | | var psObj = (PSObject)value; |
| | 11 | 57 | | if (!IsDictionaryLike(psObj)) |
| | | 58 | | { |
| | 2 | 59 | | SerializeNonDictionary(psObj, serializer); |
| | 2 | 60 | | return; |
| | | 61 | | } |
| | | 62 | | |
| | 9 | 63 | | BeginMapping(emitter); |
| | 46 | 64 | | foreach (var prop in psObj.Properties) |
| | | 65 | | { |
| | 14 | 66 | | WriteProperty(emitter, prop, serializer); |
| | | 67 | | } |
| | 9 | 68 | | EndMapping(emitter); |
| | 9 | 69 | | } |
| | | 70 | | |
| | | 71 | | // ----------------- Helper Methods ----------------- |
| | 0 | 72 | | private static void EmitNull(ObjectSerializer serializer) => serializer(null, typeof(object)); |
| | | 73 | | |
| | | 74 | | private static bool IsDictionaryLike(PSObject psObj) |
| | | 75 | | { |
| | 11 | 76 | | var baseObj = psObj.BaseObject; |
| | 11 | 77 | | return baseObj is not null and (IDictionary or PSCustomObject); |
| | | 78 | | } |
| | | 79 | | |
| | | 80 | | private static void SerializeNonDictionary(PSObject psObj, ObjectSerializer serializer) |
| | 2 | 81 | | => serializer(psObj.BaseObject, psObj.BaseObject?.GetType() ?? typeof(object)); |
| | | 82 | | |
| | | 83 | | private void BeginMapping(IEmitter emitter) |
| | | 84 | | { |
| | 9 | 85 | | var mappingStyle = useFlowStyle ? MappingStyle.Flow : MappingStyle.Block; |
| | 9 | 86 | | emitter.Emit(new MappingStart(AnchorName.Empty, TagName.Empty, true, mappingStyle)); |
| | 9 | 87 | | } |
| | | 88 | | |
| | 9 | 89 | | private static void EndMapping(IEmitter emitter) => emitter.Emit(new MappingEnd()); |
| | | 90 | | |
| | | 91 | | private void WriteProperty(IEmitter emitter, PSPropertyInfo prop, ObjectSerializer serializer) |
| | | 92 | | { |
| | 14 | 93 | | if (prop.Value is null) |
| | | 94 | | { |
| | 2 | 95 | | if (omitNullValues) |
| | | 96 | | { |
| | 1 | 97 | | return; // skip entirely |
| | | 98 | | } |
| | 1 | 99 | | EmitNullProperty(emitter, prop, serializer); |
| | 1 | 100 | | return; |
| | | 101 | | } |
| | | 102 | | |
| | | 103 | | // Emit key |
| | 12 | 104 | | serializer(prop.Name, prop.Name.GetType()); |
| | | 105 | | |
| | 12 | 106 | | var (val, type) = UnwrapValue(prop.Value); |
| | | 107 | | |
| | 12 | 108 | | if (val is string s && s.Length == 0) |
| | | 109 | | { |
| | | 110 | | // Double-quoted explicit empty string |
| | 2 | 111 | | emitter.Emit(new Scalar(AnchorName.Empty, TagName.Empty, string.Empty, ScalarStyle.DoubleQuoted, true, false |
| | 2 | 112 | | return; |
| | | 113 | | } |
| | | 114 | | |
| | 10 | 115 | | serializer(val, type); |
| | 10 | 116 | | } |
| | | 117 | | |
| | | 118 | | private void EmitNullProperty(IEmitter emitter, PSPropertyInfo prop, ObjectSerializer serializer) |
| | | 119 | | { |
| | 1 | 120 | | serializer(prop.Name, prop.Name.GetType()); |
| | 1 | 121 | | emitter.Emit(new Scalar(AnchorName.Empty, TagName.Empty, "null", ScalarStyle.Plain, true, false)); |
| | 1 | 122 | | } |
| | | 123 | | |
| | | 124 | | private static (object value, Type type) UnwrapValue(object raw) |
| | | 125 | | { |
| | 12 | 126 | | if (raw is PSObject nested) |
| | | 127 | | { |
| | 2 | 128 | | var nestedType = nested.BaseObject?.GetType(); |
| | 2 | 129 | | if (nestedType != null && nestedType != typeof(PSCustomObject) && nested.BaseObject != null) |
| | | 130 | | { |
| | 1 | 131 | | return (nested.BaseObject, nestedType); |
| | | 132 | | } |
| | | 133 | | } |
| | 11 | 134 | | return (raw, raw.GetType()); |
| | | 135 | | } |
| | | 136 | | } |