Asn1Choice.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
using Waher.Content.Asn1.Model.Macro;
 
namespace Waher.Content.Asn1.Model
{
    public class Asn1Choice : Asn1List
    {
        public Asn1Choice(string Name, bool TypeDef, Asn1Node[] Nodes)
            : base(Name, TypeDef, Nodes)
        {
        }
 
        public override bool ConstructedType => true;
 
        public override Asn1Node Parse(Asn1Document Document, Asn1Macro Macro)
        {
            int Bak = Document.pos;
 
            foreach (Asn1Node Choice in this.Nodes)
            {
                if (Choice is Asn1Type Type)
                {
                    try
                    {
                        Document.pos = Bak;
                        return Type.Parse(Document, Macro);
                    }
                    catch (Exception)
                    {
                        // Ignore
                    }
                }
            }
 
            throw Document.SyntaxError("Unable to parse choices.");
        }
 
        public override async Task ExportCSharp(StringBuilder Output, CSharpExportState State,
            int Indent, CSharpExportPass Pass)
        {
            if (Pass == CSharpExportPass.Explicit && !this.TypeDefinition)
            {
                Output.Append(ToCSharp(this.Name));
                Output.Append("Choice");
            }
            else
            {
                if (Pass == CSharpExportPass.Implicit)
                {
                    State.ClosePending(Output);
 
                    foreach (Asn1Node Node in this.Nodes)
                        await Node.ExportCSharp(Output, State, Indent, Pass);
 
                    Output.Append(Tabs(Indent));
                    Output.Append("public enum ");
                    Output.Append(ToCSharp(this.Name));
                    Output.AppendLine("Enum");
 
                    Output.Append(Tabs(Indent));
                    Output.Append("{");
 
                    Indent++;
 
                    bool First = true;
 
                    foreach (Asn1Node Node in this.Nodes)
                    {
                        if (Node is Asn1FieldDefinition Field)
                        {
                            if (First)
                                First = false;
                            else
                                Output.Append(',');
 
                            Output.AppendLine();
                            Output.Append(Tabs(Indent));
                            Output.Append(Field.Name);
                        }
                    }
 
                    Indent--;
 
                    Output.AppendLine();
                    Output.Append(Tabs(Indent));
                    Output.AppendLine("}");
                    Output.AppendLine();
                }
 
                if (Pass == CSharpExportPass.Implicit || Pass == CSharpExportPass.Explicit)
                {
                    Output.Append(Tabs(Indent));
                    Output.Append("public class ");
                    Output.Append(ToCSharp(this.Name));
                    if (!this.TypeDefinition)
                        Output.Append("Choice");
                    Output.AppendLine();
 
                    Output.Append(Tabs(Indent));
                    Output.AppendLine("{");
 
                    Indent++;
 
                    Output.Append(Tabs(Indent));
                    Output.Append("public ");
                    Output.Append(ToCSharp(this.Name));
                    if (!this.TypeDefinition)
                        Output.Append("Enum");
                    Output.AppendLine(" _choice;");
 
                    foreach (Asn1Node Node in this.Nodes)
                        await Node.ExportCSharp(Output, State, Indent, CSharpExportPass.Explicit);
 
                    Indent--;
 
                    Output.Append(Tabs(Indent));
                    Output.AppendLine("}");
                    Output.AppendLine();
                }
            }
        }
    }
}