/**
 *
 * @author    seagle
 * @date      2024-7-22
 * @Description 块语句处理
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MECF.Framework.UI.Core.DxfScript
{
    public class BlockSentence : Sentence
    {
        private List<Sentence> _sentences = new List<Sentence>();
        public int SentencesCount { get { return _sentences.Count; } }
        //解析多条语句

        public override void Create(StringReader reader)
        {
            KeywordType kw;
            while ((kw = reader.Next()) != KeywordType.KW_EOF)
            {
                if (kw == KeywordType.KW_IF)
                {
                    //if语句
                    reader.rollback(kw);
                    IfSentence ifSentence = new IfSentence();
                    ifSentence.Create(reader);
                    _sentences.Add(ifSentence);
                }
                else if (kw == KeywordType.KW_VARIABLE)
                {
                    //赋值语句
                    reader.rollback(kw);
                    SetSentence setSentence = new SetSentence();
                    setSentence.Create(reader);
                    _sentences.Add(setSentence);
                }
                else if (kw == KeywordType.KW_FUNCTION)
                {
                    //函数语句
                    reader.rollback(kw);
                    FunSentence setSentence = new FunSentence();
                    setSentence.Create(reader);
                    _sentences.Add(setSentence);

                
                }
                else if (kw == KeywordType.KW_RETURN)
                {
                    //return语句
                    reader.rollback(kw);
                    ReturnSentence returnSentence = new ReturnSentence();
                    returnSentence.Create(reader);
                    _sentences.Add(returnSentence);
                }
                else if (kw == KeywordType.KW_BRACE_RIGHT)
                {
                    break;
                }
                else if (kw == KeywordType.KW_SEP)
                {
                    continue;
                }
                else
                {
                    throw new Exception("Unexpected keyword：" + kw);
                }
            }
        }

      
        public override void Execute()
        {

            foreach (Sentence sentence in _sentences)
            {
                if (sentence is IfSentence)
                {
                    IfSentence ifSentence = sentence as IfSentence;
                    ifSentence.Execute();
                    if (ifSentence.ShouldReturn)
                    {
                        ShouldReturn = true;
                        ReturnVar = ifSentence.ReturnVar;
                        return;
                    }
                }
                else if (sentence is SetSentence)
                {
                    SetSentence setSentence = sentence as SetSentence;
                    setSentence.Execute();
                    //ShouldReturn = true;
                }
                else if (sentence is FunSentence)
                {
                    FunSentence funSentence = sentence as FunSentence;
                    funSentence.Execute();
                    //ShouldReturn = true;
                }
                else if (sentence is BlockSentence)
                {
                    BlockSentence blockSentence = sentence as BlockSentence;
                    blockSentence.Execute();
                    if (blockSentence.ShouldReturn)
                    {
                        ShouldReturn = true;
                        ReturnVar = blockSentence.ReturnVar;
                        return;
                    }

                }
                else if (sentence is ReturnSentence)
                {
                    ReturnSentence returnSentence = sentence as ReturnSentence;
                    returnSentence.Execute();
                    ShouldReturn = true;
                    ReturnVar = returnSentence.ReturnVar;
                    return;

                }
            }
        }

    }
}