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

namespace MECF.Framework.UI.Core.DxfScript
{
    public class SetSentence:Sentence
    {
        private Variable _var = null;
        private Express _expr = null;
        public override void Create(StringReader reader)
        {
            KeywordType kw = reader.Next();
            if (kw != KeywordType.KW_VARIABLE)
            {
                throw new Exception("SetSentence: variable name expected");
            }
            string varName = reader.Data();
            VariableDataType dataType = ScriptVariables.GetVariableDataTypeByName(varName);
            _var = new Variable(varName, dataType);
            kw = reader.Next();
            if (kw != KeywordType.KW_SET)
            {
                throw new Exception("SetSentence: set expected");
            }
            _expr = new Express();
            _expr.Create(reader);
            _expr.ComputeNode(_expr.Root, true);
            if (_var.DataType != _expr.Root.Var.DataType)
            {
                throw new Exception("SetSentence: variable type and expression type not match");
            }
        }
        public override void Execute()
        {
            _expr.Compute();
            _var.CopyFrom(_expr.Root.Var);
        }
    }
}