stgsharp/StgSharp.Script/Express/ExpAstNode/ExpProcedureControlNode.cs

//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
//     file="ExpProcedureControlNode.cs"
//     Project: StgSharp
//     AuthorGroup: Nitload Space
//     Copyright (c) Nitload Space. All rights reserved.
//     
//     Permission is hereby granted, free of charge, to any person 
//     obtaining a copy of this software and associated documentation 
//     files (the “Software”), to deal in the Software without restriction, 
//     including without limitation the rights to use, copy, modify, merge,
//     publish, distribute, sublicense, and/or sell copies of the Software, 
//     and to permit persons to whom the Software is furnished to do so, 
//     subject to the following conditions:
//     
//     The above copyright notice and 
//     this permission notice shall be included in all copies 
//     or substantial portions of the Software.
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//     THE SOFTWARE IS PROVIDED “AS IS”, 
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//-----------------------------------------------------------------------
//-----------------------------------------------------------------------
using Microsoft.CodeAnalysis.CSharp.Syntax;

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using ExpKeyword = StgSharp.Script.Express.ExpressCompile.Keyword;

namespace StgSharp.Script.Express
{
    public class ExpProcedureControlNode : ExpSyntaxNode
    {

        private ExpSyntaxNode _additional;

        internal ExpProcedureControlNode( Token source ) : base( source ) { }

        public override ExpSyntaxNode Left => Empty;

        public override ExpSyntaxNode Right => _additional;

        public override IExpElementSource EqualityTypeConvert => ExpTypeSource.Void;

        public static ExpProcedureControlNode Return( Token t, ExpSyntaxNode valueToReturn )
        {
            if( t.Value != ExpKeyword.Return ) {
                throw new InvalidCastException();
            }
            ExpProcedureControlNode ret = new ExpProcedureControlNode( t )
            {
                _additional = valueToReturn ?? Empty,
                CodeConvertTemplate = IsNullOrEmpty( valueToReturn! ) ?
                        ExpKeyword.Return : "return {0}",
            };
            return ret;
        }

        public static ExpProcedureControlNode Skip( Token t )
        {
            ExpProcedureControlNode ret = new ExpProcedureControlNode( t )
            {
                _additional = Empty,
                CodeConvertTemplate = "break"
            };
            return ret;
        }

    }
}