internal void OnPocoInfoAvailable(PocoJsonInfo p)
{
PocoJsonInfo = p;
if (!p.IsECMAStandardCompliant)
{
ECMAStandardHandlers = Array.Empty <JsonCodeGenHandler>();
}
}
bool ExtendPocoClass(IActivityMonitor monitor, IPocoRootInfo pocoInfo, JsonSerializationCodeGen jsonCodeGen, ITypeScope pocoClass)
{
bool success = true;
// Each Poco class is a IWriter and has a constructor that accepts a Utf8JsonReader.
pocoClass.Definition.BaseTypes.Add(new ExtendedTypeName("CK.Core.PocoJsonSerializer.IWriter"));
// Defines ToString() to return the Json representation only if it is not already defined.
var toString = FunctionDefinition.Parse("public override string ToString()");
if (pocoClass.FindFunction(toString.Key, false) == null)
{
pocoClass
.CreateFunction(toString)
.GeneratedByComment().NewLine()
.Append("var m = new System.Buffers.ArrayBufferWriter<byte>();").NewLine()
.Append("using( var w = new System.Text.Json.Utf8JsonWriter( m ) )").NewLine()
.OpenBlock()
.Append("Write( w, false, null );").NewLine()
.Append("w.Flush();").NewLine()
.CloseBlock()
.Append("return Encoding.UTF8.GetString( m.WrittenMemory.Span );");
}
// The Write method:
// - The writeHeader part may contain the ECMAScriptStandard non compliant exception (if it appears that a UnionType is not compliant).
// - The write part will be filled with the properties (name and writer code).
pocoClass.Append("public void Write( System.Text.Json.Utf8JsonWriter w, bool withType, PocoJsonSerializerOptions options )")
.OpenBlock()
.GeneratedByComment().NewLine()
.CreatePart(out var writeHeader)
.Append("bool usePascalCase = options != null && options.ForJsonSerializer.PropertyNamingPolicy != System.Text.Json.JsonNamingPolicy.CamelCase;").NewLine()
.Append("if( withType ) { w.WriteStartArray(); w.WriteStringValue( ").AppendSourceString(pocoInfo.Name).Append("); }").NewLine()
.Append("w.WriteStartObject();")
.CreatePart(out var write)
.Append("w.WriteEndObject();").NewLine()
.Append("if( withType ) w.WriteEndArray();").NewLine()
.CloseBlock();
// The constructor calls the private Read method.
pocoClass.Append("public ").Append(pocoClass.Name).Append("( ref System.Text.Json.Utf8JsonReader r, PocoJsonSerializerOptions options ) : this()")
.OpenBlock()
.Append("Read( ref r, options );")
.CloseBlock();
// Poco has a Read method but it is not (currently) exposed.
// This returns two parts: a header (to inject the ECMAScriptStandard non compliant
// exception if it appears that a UnionType is not compliant) and the switch-case part on the
// property names with their reader code.
var(readHeader, read) = GenerateReadBody(pocoInfo, pocoClass);
bool isECMAScriptStandardCompliant = true;
var jsonProperties = new PocoJsonPropertyInfo[pocoInfo.PropertyList.Count];
foreach (var p in pocoInfo.PropertyList)
{
var mainHandler = jsonCodeGen.GetHandler(p.PropertyNullableTypeTree);
if (mainHandler == null)
{
success = false;
continue;
}
PocoJsonPropertyInfo?pJ;
if (p.PropertyUnionTypes.Any())
{
pJ = HandleUnionType(p, monitor, jsonCodeGen, write, read, ref isECMAScriptStandardCompliant, mainHandler);
if (pJ == null)
{
success = false;
break;
}
}
else
{
var handlers = new[] { mainHandler };
pJ = new PocoJsonPropertyInfo(p, handlers, mainHandler.HasECMAScriptStandardJsonName && isECMAScriptStandardCompliant ? handlers : null);
// Actual Read/Write generation cannot be done here (it must be postponed).
// This loop registers/allows the poco property types (the call to GetHandler triggers
// the type registration) but writing them requires to know whether those types are final or not .
// We store (using closure) the property, the write and read parts and the handler(s)
// (to avoid another lookup) and wait for the FinalizeJsonSupport to be called.
_finalReadWrite.Add(() =>
{
var fieldName = "_v" + p.Index;
write.Append("w.WritePropertyName( usePascalCase ? ")
.AppendSourceString(p.PropertyName)
.Append(" : ")
.AppendSourceString(System.Text.Json.JsonNamingPolicy.CamelCase.ConvertName(p.PropertyName))
.Append(" );").NewLine();
mainHandler.GenerateWrite(write, fieldName);
write.NewLine();
var camel = System.Text.Json.JsonNamingPolicy.CamelCase.ConvertName(p.PropertyName);
if (camel != p.PropertyName)
{
read.Append("case ").AppendSourceString(camel).Append(": ");
}
read.Append("case ").AppendSourceString(p.PropertyName).Append(": ")
.OpenBlock();
mainHandler.GenerateRead(read, fieldName, assignOnly: !p.IsReadOnly);
read.Append("break; ")
.CloseBlock();
});
}
p.AddAnnotation(pJ);
jsonProperties[p.Index] = pJ;
}
if (success)
{
if (!isECMAScriptStandardCompliant)
{
writeHeader.And(readHeader).Append("if( options != null && options.Mode == PocoJsonSerializerMode.ECMAScriptStandard ) throw new NotSupportedException( \"Poco '")
.Append(pocoInfo.Name)
.Append("' is not compliant with the ECMAScripStandard mode.\" );").NewLine();
}
var info = new PocoJsonInfo(pocoInfo, isECMAScriptStandardCompliant, jsonProperties);
pocoInfo.AddAnnotation(info);
}
return(success);
}
