/**
 *
 * @author    seagle
 * @date      2024-7-10
 * @Description 表达式结点
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MECF.Framework.UI.Core.DxfScript
{
	public delegate void UserFunction(ExpressNode curr, bool OnlyCheckDataType = false);

	public class ExpressNode
    {
		
		public KeywordType NodeType { get; set;}
        public Variable Var { get; set; }
		
		public UserFunction UserFunc;
		public bool Closed { get; set; }
		public ExpressNode FirstChild, LastChild, NextBrother, PrevBrother, Father;
		public ExpressNode(Variable var,UserFunction userFunc,KeywordType nodeType )
        {
			Var = var;
			UserFunc = userFunc;
			NodeType = nodeType;
			FirstChild = LastChild = NextBrother = PrevBrother = Father = null;
			Closed = false;
        }
		public int ComparePrior(KeywordType kw)
        {
			int prior1 = getOperatorPrior(NodeType);
			int prior2 = getOperatorPrior(kw);
			if (prior1 < 0 || prior2 < 0)
			{
				throw new Exception("Can not compare prior [" + NodeType + "] and [" + kw + "]");
				
			}
			if (prior1 < prior2)
			{
				return -1;
			}
			else if (prior1 > prior2)
			{
				return 1;
			}
			else
			{
				if ((NodeType == KeywordType.KW_OPERATOR_PLUS && kw == KeywordType.KW_OPERATOR_PLUS) ||
					(NodeType == KeywordType.KW_OPERATOR_MULTIPLE && kw == KeywordType.KW_OPERATOR_MULTIPLE) ||
					(NodeType == KeywordType.KW_OPERATOR_AND && kw == KeywordType.KW_OPERATOR_AND) ||
					(NodeType == KeywordType.KW_OPERATOR_OR && kw == KeywordType.KW_OPERATOR_OR) ||
					(NodeType == KeywordType.KW_OPERATOR_BIT_AND && kw == KeywordType.KW_OPERATOR_BIT_AND) ||
					(NodeType == KeywordType.KW_OPERATOR_BIT_OR && kw == KeywordType.KW_OPERATOR_BIT_OR) ||
					(NodeType == KeywordType.KW_OPERATOR_COMMA && kw == KeywordType.KW_OPERATOR_COMMA))
				{
					return 0;
				}
				else
				{
					return 1;
				}
			}
			
        }
		//运算符优先级
		private static int getOperatorPrior(KeywordType Operator)
		{
			switch (Operator)
			{
				case KeywordType.KW_FUNCTION:
				case KeywordType.KW_ROUND_LEFT:
					return 0;
				case KeywordType.KW_OPERATOR_COMMA:
					return 1;
				case KeywordType.KW_OPERATOR_OR:
					return 2;
				case KeywordType.KW_OPERATOR_AND:
					return 3;
				case KeywordType.KW_OPERATOR_NOT:
					return 4;
				case KeywordType.KW_OPERATOR_GT:
				case KeywordType.KW_OPERATOR_GE:
				case KeywordType.KW_OPERATOR_LT:
				case KeywordType.KW_OPERATOR_LE:
				case KeywordType.KW_OPERATOR_EQUAL:
				case KeywordType.KW_OPERATOR_NOT_EQUAL:
					return 5;
				case KeywordType.KW_OPERATOR_PLUS:
				case KeywordType.KW_OPERATOR_MINUS:
					return 6;
				case KeywordType.KW_OPERATOR_MULTIPLE:
				case KeywordType.KW_OPERATOR_DEVIDE:
					return 7;
				case KeywordType.KW_OPERATOR_NEGATIVE:
					return 8;
				case KeywordType.KW_OPERATOR_BIT_OR:
					return 9;
				case KeywordType.KW_OPERATOR_BIT_AND:
					return 10;
				case KeywordType.KW_OPERATOR_BIT_NOT:
					return 11;
				case KeywordType.KW_OPERATOR_MOVE_LEFT:
				case KeywordType.KW_OPERATOR_MOVE_RIGHT:
					return 12;
				default:
					return -1;
			}

		}


	}
}