/// <summary>
/// Generates code for writing one field as a JSON string
/// </summary>
public static void FieldJsonWriter(ProtoMessage m, Field f, CodeWriter cw, Options options)
{
cw.WriteLine("writer.Write(\"\\\"" + f.ProtoName + "\\\":\");");
if (f.Rule == FieldRule.Repeated)
{
cw.WriteLine();
cw.IfBracket("instance." + f.CsName + " != null");
cw.WriteLine("writer.Write(\"[\");");
cw.WriteLine("var first = true;");
cw.ForeachBracket("var i" + f.ID + " in instance." + f.CsName);
cw.WriteLine("if (!first) writer.Write(\",\");");
cw.WriteLine("else first = false;");
cw.WriteLine(FieldWriterJsonType(f, m.RequiredMessageTables, "writer", "i" + f.ID));
cw.EndBracket();
cw.WriteLine("writer.Write(\"]\");");
cw.ElseBracket();
cw.WriteLine("writer.Write(\"null\");");
cw.EndBracket();
return;
}
else if (f.Rule == FieldRule.Optional)
{
if (options.Nullable ||
f.ProtoType is ProtoMessage ||
f.ProtoType.ProtoName == ProtoBuiltin.String ||
f.ProtoType.ProtoName == ProtoBuiltin.Bytes)
{
var nullable = (f.ProtoType.Nullable || options.Nullable) && !(f.ProtoType.OptionType == "interface" && m.RequiredMessageTables.Contains(f.ProtoType));
if (nullable) //Struct always exist, not optional
{
cw.IfBracket("instance." + f.CsName + " != null");
}
var needValue = !f.ProtoType.Nullable && options.Nullable;
cw.WriteLine(FieldWriterJsonType(f, m.RequiredMessageTables, "writer", "instance." + f.CsName + (needValue ? ".Value" : "")));
if (nullable) //Struct always exist, not optional
{
cw.ElseBracket();
cw.WriteLine("writer.Write(\"null\");");
cw.EndBracket();
}
return;
}
if (f.ProtoType is ProtoEnum)
{
cw.WriteLine(FieldWriterJsonType(f, m.RequiredMessageTables, "writer", "instance." + f.CsName));
return;
}
cw.WriteLine(FieldWriterJsonType(f, m.RequiredMessageTables, "writer", "instance." + f.CsName));
return;
}
else if (f.Rule == FieldRule.Required)
{
if (f.ProtoType is ProtoMessage && f.ProtoType.OptionType != "struct" ||
f.ProtoType.ProtoName == ProtoBuiltin.String ||
f.ProtoType.ProtoName == ProtoBuiltin.Bytes)
{
cw.WriteLine("if (instance." + f.CsName + " == null)");
cw.WriteIndent("throw new ArgumentNullException(\"" + f.CsName + "\", \"Required by proto specification.\");");
}
cw.WriteLine(FieldWriterJsonType(f, m.RequiredMessageTables, "writer", "instance." + f.CsName));
return;
}
throw new NotImplementedException("Unknown rule: " + f.Rule);
}