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716 lines
30 KiB
716 lines
30 KiB
using System;
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using System.Collections.Generic;
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using System.Linq.Expressions;
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using System.Reflection;
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using System.Runtime.InteropServices;
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namespace DataService
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{
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public class ExpressionEval : IDisposable
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{
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Expression _param1;
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List<ITag> _tagList = new List<ITag>();
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public List<ITag> TagList
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{
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get
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{
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return _tagList;
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}
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}
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IDataServer _server;
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public ExpressionEval(IDataServer server)
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{
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_server = server;
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_param1 = Expression.Constant(this);
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}
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public Delegate Eval(string expression)
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{
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if (string.IsNullOrEmpty(expression)) return null;
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var lambda = ComplieRpnExp(RpnExpression(expression));
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if (lambda != null) return lambda.Compile();
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return null;
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}
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public Delegate WriteEval(string expression)
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{
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if (_server == null || string.IsNullOrEmpty(expression)) return null;
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if (_server[expression.ToUpper()] != null)
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{
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return new Func<object, int>((object value) => { return WriteTag(expression, value); });
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}
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return null;
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}
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public Func<int> WriteEval(string expression1, string expression2)
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{
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if (_server == null || string.IsNullOrEmpty(expression2)) return null;
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if (_server[expression1.ToUpper()] != null)
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{
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var dele = Eval(expression2);
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var funcbool = dele as Func<bool>;
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if (funcbool != null)
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return () => { return WriteTag(expression1, funcbool()); };
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var funcint = dele as Func<int>;
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if (funcint != null)
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return () => { return WriteTag(expression1, funcint()); };
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var funcfloat = dele as Func<float>;
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if (funcfloat != null)
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return () => { return WriteTag(expression1, funcfloat()); };
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var funcstring = dele as Func<string>;
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if (funcstring != null)
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return () => { return WriteTag(expression1, funcstring()); };
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}
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return null;
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}
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public static bool ValidationExpression(string expression)
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{
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return true;//可加入正则表达式验证
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}
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/// <summary>
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/// 操作符运算级别
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/// </summary>
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/// <param name="strOperator">操作符</param>
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/// <returns>操作运算符，空格返回0，出错返回-1</returns>
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private static byte GetOperatorLevel(char strOperator)
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{
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switch (strOperator)
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{
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case '~':
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return 10;
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case '*':
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case '/':
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case '%':
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return 9;
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case '+':
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case '-':
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return 8;
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case '>':
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case '<':
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return 7;
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case '&':
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return 6;
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case '^':
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return 5;
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case '|':
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return 4;
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case '=':
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case '!':
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case '?':
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return 3;
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case '(':
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return 2;
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case ')':
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return 1;
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//case ':':
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default:
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return 0;
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}
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}
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/// <summary>
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/// 将中缀表达式转换为逆波兰表达式
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/// </summary>
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/// <param name="expression">标准中缀表达式</param>
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/// <returns>标准逆波兰表达式</returns>
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public static List<string> RpnExpression(string expression)
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{
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//加入结束标记
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//定义出栈和入栈堆栈
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string[] strNum = expression.Split('~', '%', '>', '<', '=', '!', '&', '|', '?', '#', '^', '+', '-', '*', '/', '(', ')');
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if (strNum.Length < 2) return new List<string>() { expression };
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//操作运算符堆栈
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Stack<Operator> oper = new Stack<Operator>();
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//定义输出堆栈
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List<string> output = new List<string>();
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//定义前缀表达式字符读取指针
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int i = 0;
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//定义当前读取数字数组指针
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int n = -1;
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//定义操作运算符级别函数
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Operator op = new Operator();
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//输出堆栈的大小
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int intStackCount = 0;
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//从左到右读取前缀表达式
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while (i < expression.Length)
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{
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//读取一个字符
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char strChar = expression[i];
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//取字符的运算级别
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if (strChar == '#') { i++; continue; }
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byte intLevel = GetOperatorLevel(strChar);
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if (intLevel == 0)
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//数字直接推入输出堆栈
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{
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while (n++ < strNum.Length)
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{
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if (strNum[n] != "")
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{
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output.Add(strNum[n]);
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i += strNum[n].Length;
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//移动数组指针
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break;
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}
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}
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}
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else //操作字符根据运算字符级别推入运算符堆栈
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{
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if (oper.Count == 0)
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{
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//运算符堆栈为空，直接推入堆栈
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oper.Push(new Operator(strChar, intLevel));
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//移动字符读取指针
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i++;
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}
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else
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{
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op = oper.Peek();
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if (intLevel > op.Level || intLevel == 2)
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{
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//运算字符比运算符堆栈最后的级别高或者运算符为'('直接推入运算符堆栈
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oper.Push(new Operator(strChar, intLevel));
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//移动字符读取指针
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i++;
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}
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else
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{
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//运算字符不高于运算符堆栈最后的级别，则将运算符堆栈出栈，直到比其高为止
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intStackCount = oper.Count;
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for (int m = 0; m < intStackCount; m++)
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{
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op = oper.Peek();
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if (op.Level >= intLevel)
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{
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//将操作符出栈并压入输入堆栈
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char o = op.OperatorStack;
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if (!(o == ')' || o == '('))
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{
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output.Add(o.ToString());
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}
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oper.Pop();
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if (op.Level == 2)
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{
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//如果操作符堆栈中最后的操作符为'('则停止出栈
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i++;
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break;
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}
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}
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else
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{
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//直到运算符已经高出运算符栈中最后的级别，则入栈
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oper.Push(new Operator(strChar, intLevel));
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i++;
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break;
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}
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}
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}
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}
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}
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}
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intStackCount = oper.Count;
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for (int m = 0; m < intStackCount; m++)
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{
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op = oper.Peek();
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output.Add(op.OperatorStack.ToString());
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oper.Pop();
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}
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return output;
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}
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/// <summary>
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/// 解逆波兰表达式
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/// </summary>
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/// <param name="expression">标准逆波兰表达式</param>
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/// <returns>逆波兰表达式的解</returns>
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public LambdaExpression ComplieRpnExp(List<string> strNum)
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{
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_tagList.Clear();
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//拆分逆波兰表达式
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int intLenth = strNum.Count;
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if (intLenth == 0) return null;
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//定义数字堆栈
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try
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{
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Stack<Expression> number = new Stack<Expression>();
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for (int i = 0; i < intLenth; i++)
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{
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string expr = strNum[i];
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switch (expr)
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{
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case "~":
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if (number.Count > 0)
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{
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Expression left = number.Pop();
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number.Push(Expression.Not(left));
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}
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break;
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case "*":
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if (number.Count > 1)
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{
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Expression right = number.Pop();
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Expression left = number.Pop();
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if (left.Type != right.Type)
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{
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if (left.Type != typeof(float))
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left = Expression.Convert(left, typeof(float));
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if (right.Type != typeof(float))
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right = Expression.Convert(right, typeof(float));
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}
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number.Push(Expression.Multiply(left, right));
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}
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break;
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case "/":
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if (number.Count > 1)
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{
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Expression right = number.Pop();
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Expression left = number.Pop();
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if (left.Type != right.Type)
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{
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if (left.Type != typeof(float))
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left = Expression.Convert(left, typeof(float));
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if (right.Type != typeof(float))
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right = Expression.Convert(right, typeof(float));
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}
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number.Push(Expression.Divide(left, right));
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}
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break;
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case "%":
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if (number.Count > 1)
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{
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Expression right = number.Pop();
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Expression left = number.Pop();
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if (left.Type != right.Type)
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{
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if (left.Type != typeof(int))
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left = Expression.Convert(left, typeof(int));
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if (right.Type != typeof(int))
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right = Expression.Convert(right, typeof(int));
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}
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number.Push(Expression.Modulo(left, right));
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}
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break;
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case "+":
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if (number.Count > 1)
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{
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Expression right = number.Pop();
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Expression left = number.Pop();
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if (left.Type == typeof(string) || right.Type == typeof(string))
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{
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if (left.Type != typeof(string))
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left = Expression.Convert(left, typeof(object));
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if (right.Type != typeof(string))
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right = Expression.Convert(right, typeof(object));
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number.Push(Expression.Call(typeof(string).GetMethod("Concat", new Type[] { typeof(object), typeof(object) }), left, right));
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}
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else
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{
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if (left.Type != right.Type)
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{
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if (left.Type != typeof(float))
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left = Expression.Convert(left, typeof(float));
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if (right.Type != typeof(float))
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right = Expression.Convert(right, typeof(float));
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}
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number.Push(Expression.Add(left, right));
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}
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}
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break;
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case "-":
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if (number.Count > 1)
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{
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Expression right = number.Pop();
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Expression left = number.Pop();
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if (left.Type != right.Type)
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{
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if (left.Type != typeof(float))
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left = Expression.Convert(left, typeof(float));
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if (right.Type != typeof(float))
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right = Expression.Convert(right, typeof(float));
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}
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number.Push(Expression.Subtract(left, right));
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}
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break;
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case ">":
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if (number.Count > 1)
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{
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Expression right = number.Pop();
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Expression left = number.Pop();
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if (left.Type != right.Type)
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{
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if (left.Type != typeof(float))
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left = Expression.Convert(left, typeof(float));
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if (right.Type != typeof(float))
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right = Expression.Convert(right, typeof(float));
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}
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number.Push(Expression.GreaterThan(left, right));
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}
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break;
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case "<":
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if (number.Count > 1)
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{
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Expression right = number.Pop();
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Expression left = number.Pop();
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if (left.Type != right.Type)
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{
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if (left.Type != typeof(float))
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left = Expression.Convert(left, typeof(float));
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if (right.Type != typeof(float))
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right = Expression.Convert(right, typeof(float));
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}
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number.Push(Expression.LessThan(left, right));
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}
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break;
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case "&":
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if (number.Count > 1)
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{
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Expression right = number.Pop();
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Expression left = number.Pop();
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number.Push(Expression.And(left, right));
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}
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break;
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case "^":
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if (number.Count > 1)
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{
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Expression right = number.Pop();
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Expression left = number.Pop();
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number.Push(Expression.ExclusiveOr(left, right));
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}
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break;
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case "|":
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if (number.Count > 1)
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{
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Expression right = number.Pop();
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Expression left = number.Pop();
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number.Push(Expression.Or(left, right));
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}
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break;
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case "=":
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if (number.Count > 1)
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{
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Expression right = number.Pop();
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Expression left = number.Pop();
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if (left.Type != right.Type)
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{
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if (left.Type != typeof(float))
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left = Expression.Convert(left, typeof(float));
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if (right.Type != typeof(float))
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right = Expression.Convert(right, typeof(float));
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}
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number.Push(Expression.Equal(left, right));
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}
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break;
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case "!":
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if (number.Count > 1)
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{
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Expression right = number.Pop();
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Expression left = number.Pop();
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if (left.Type != right.Type)
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{
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if (left.Type != typeof(float))
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left = Expression.Convert(left, typeof(float));
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if (right.Type != typeof(float))
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right = Expression.Convert(right, typeof(float));
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}
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number.Push(Expression.NotEqual(left, right));
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}
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break;
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case "?":
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if (number.Count > 1)
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{
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Expression right = number.Pop();
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Expression left = number.Pop();
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if (left.Type != right.Type)
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{
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if (left.Type != typeof(float))
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left = Expression.Convert(left, typeof(float));
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if (right.Type != typeof(float))
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right = Expression.Convert(right, typeof(float));
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}
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Expression test = number.Pop();
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number.Push(Expression.Condition(test, left, right));
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}
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break;
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default:
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if (expr[0] == '@')
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{
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switch (expr.Substring(1).ToUpper())
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{
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case "TIME":
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{
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Expression<Func<string>> f = () => DateTime.Now.ToShortTimeString();
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number.Push(f.Body);
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}
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goto lab1;
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case "DATE":
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{
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Expression<Func<string>> f = () => DateTime.Now.ToShortDateString();
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number.Push(f.Body);
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}
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goto lab1;
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case "DATETIME":
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{
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Expression<Func<string>> f = () => DateTime.Now.ToString();
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number.Push(f.Body);
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}
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goto lab1;
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case "APP":
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{
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Expression<Func<string>> f = () => AppDomain.CurrentDomain.FriendlyName;
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number.Push(f.Body);
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}
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goto lab1;
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case "NAME":
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{
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Expression<Func<string>> f = () => Environment.MachineName;
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number.Push(f.Body);
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}
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goto lab1;
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case "PATH":
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{
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Expression<Func<string>> f = () => Environment.CurrentDirectory;
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number.Push(f.Body);
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}
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goto lab1;
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case "USER":
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{
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Expression<Func<string>> f = () => Environment.UserName;
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number.Push(f.Body);
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}
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goto lab1;
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case "REGION":
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{
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Expression<Func<string>> f = () => System.Globalization.CultureInfo.CurrentCulture.Name;
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number.Push(f.Body);
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}
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goto lab1;
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}
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}
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object result;
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if (IsConstant(expr, out result))
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{
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number.Push(Expression.Constant(result));
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}
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else
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{
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number.Push(GetTagExpression(expr));
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}
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lab1:
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break;
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}
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}
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Expression d = number.Pop();
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return Expression.Lambda(d);
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}
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catch (Exception e) { return null; }
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}
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MethodInfo _boolinfo = typeof(ExpressionEval).GetMethod("GetBool");
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MethodInfo _floatinfo = typeof(ExpressionEval).GetMethod("GetFloat");
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MethodInfo _intinfo = typeof(ExpressionEval).GetMethod("GetInt");
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MethodInfo _stringinfo = typeof(ExpressionEval).GetMethod("GetString");
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|
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public Expression GetTagExpression(string tagName)
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{
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if (_server == null) return Expression.Empty();
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ITag tag = _server[tagName];
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switch (tag.Address.VarType)
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{
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case DataType.BOOL:
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return Expression.Call(_param1, _boolinfo, Expression.Constant(tagName));
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case DataType.BYTE:
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case DataType.WORD:
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case DataType.SHORT:
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case DataType.TIME:
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case DataType.INT:
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return Expression.Call(_param1, _intinfo, Expression.Constant(tagName));
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case DataType.FLOAT:
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return Expression.Call(_param1, _floatinfo, Expression.Constant(tagName));
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case DataType.STR:
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return Expression.Call(_param1, _stringinfo, Expression.Constant(tagName));
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default:
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return Expression.Empty();
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}
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}
|
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|
|
public bool GetBool(string tagName)
|
|
{
|
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if (_server == null) return false;
|
|
ITag tag = _server[tagName];
|
|
switch (tag.Address.VarType)
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|
{
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|
case DataType.BOOL:
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return tag.Value.Boolean;
|
|
case DataType.BYTE:
|
|
return Convert.ToBoolean(tag.Value.Byte);
|
|
case DataType.WORD:
|
|
case DataType.SHORT:
|
|
return Convert.ToBoolean(tag.Value.Int16);
|
|
case DataType.TIME:
|
|
case DataType.INT:
|
|
return Convert.ToBoolean(tag.Value.Int32);
|
|
case DataType.FLOAT:
|
|
return Convert.ToBoolean(tag.Value.Single);
|
|
case DataType.STR:
|
|
return Convert.ToBoolean(tag.ToString());
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
public float GetFloat(string tagName)
|
|
{
|
|
if (_server == null) return 0f;
|
|
ITag tag = _server[tagName];
|
|
return tag.ScaleToValue(tag.Value);
|
|
}
|
|
|
|
public int GetInt(string tagName)
|
|
{
|
|
if (_server == null) return 0;
|
|
ITag tag = _server[tagName];
|
|
switch (tag.Address.VarType)
|
|
{
|
|
case DataType.BOOL:
|
|
return tag.Value.Boolean ? 1 : 0;
|
|
case DataType.BYTE:
|
|
return (int)tag.Value.Byte;
|
|
case DataType.WORD:
|
|
case DataType.SHORT:
|
|
return (int)tag.Value.Int16;
|
|
case DataType.TIME:
|
|
case DataType.INT:
|
|
return tag.Value.Int32;
|
|
case DataType.FLOAT:
|
|
return Convert.ToInt32(tag.Value.Single);
|
|
case DataType.STR:
|
|
return int.Parse(tag.ToString());
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
public string GetString(string tagName)
|
|
{
|
|
return _server == null ? null : _server[tagName].ToString();
|
|
}
|
|
|
|
public int WriteTag(string tagName, object value)
|
|
{
|
|
if (_server == null || value == null) return -1;
|
|
ITag tag = _server[tagName];
|
|
if (tag.Address.VarType == DataType.BOOL || tag.Address.VarType == DataType.STR)
|
|
return tag.Write(value);
|
|
else
|
|
{
|
|
float temp;
|
|
string str = value as string;
|
|
if (str == null) temp = Convert.ToSingle(value);
|
|
else
|
|
{
|
|
if (!float.TryParse(str, out temp))
|
|
return -1;
|
|
}
|
|
return tag.Write(tag.ValueToScale(temp));
|
|
}
|
|
}
|
|
|
|
private bool IsConstant(string str, out object value)
|
|
{
|
|
if (str.Length > 1 & str[0] == '\'' && str[str.Length - 1] == '\'')
|
|
{
|
|
value = str.Trim('\'');
|
|
return true;
|
|
}
|
|
string upp = str.ToUpper();
|
|
if (upp == "TRUE")
|
|
{
|
|
value = true;
|
|
return true;
|
|
}
|
|
else if (upp == "FALSE")
|
|
{
|
|
value = false;
|
|
return true;
|
|
}
|
|
if (_server != null)
|
|
{
|
|
var tag = _server[upp];
|
|
if (tag != null)
|
|
{
|
|
if (!_tagList.Contains(tag))
|
|
_tagList.Add(tag);
|
|
value = null;
|
|
return false;
|
|
}
|
|
}
|
|
int dotcount = 0;
|
|
for (int i = 0; i < str.Length; i++)
|
|
{
|
|
char opr = str[i];
|
|
if (opr < '0' || opr > '9')
|
|
{
|
|
if (opr != '.')
|
|
{
|
|
value = str;
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
if (dotcount > 0)
|
|
{
|
|
value = str;
|
|
return true;
|
|
}
|
|
dotcount++;
|
|
}
|
|
}
|
|
}
|
|
//value = (dotcount == 0 ? int.Parse(str) : float.Parse(str));
|
|
if (dotcount == 0)
|
|
value = int.Parse(str);
|
|
else value = float.Parse(str);
|
|
return true;
|
|
}
|
|
|
|
public void Clear()
|
|
{
|
|
//_param1 = null;
|
|
_tagList.Clear();
|
|
//_tagList = null;
|
|
}
|
|
|
|
public void Dispose()
|
|
{
|
|
_param1 = null;
|
|
_tagList.Clear();
|
|
_tagList = null;
|
|
_boolinfo = _floatinfo = _stringinfo = null;
|
|
}
|
|
}
|
|
|
|
[StructLayout(LayoutKind.Sequential)]
|
|
/// <summary>
|
|
/// 操作符结构
|
|
/// </summary>
|
|
public struct Operator
|
|
{
|
|
public char OperatorStack;
|
|
public byte Level;
|
|
public Operator(char OperatorStack, byte Level)
|
|
{
|
|
this.OperatorStack = OperatorStack;
|
|
this.Level = Level;
|
|
}
|
|
}
|
|
}
|
|
|