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表达式解析的全部源码 C#版

王朝c#·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

[原创]表达式解析的全部源码 开放了 以望吸引人气

using System;

using System.Collections;

namespace XXXXX

{

public class Expression

{

private Expression() {}

#region No01.表达式分割为ArrayList形式

/// <summary>

/// 要求表达式以空格\t作为分隔符

/// 转换表达式折分为:

/// 变量及数值 ,变量不允许为@

/// 字符串“”

/// 运算符号{+、-、*、/、++、+=、--、-=、*=、/=、!、!=、>、>=、>>、<、<=、<>、|、|=、||、&、&=、&&}

/// 括号{包括(、)}

/// </summary>

/// <param name="sExpression"></param>

/// <returns></returns>

public static ArrayList ConvertExpression(string sExpression)

{

ArrayList alist = new ArrayList();

string word = null;

int i = 0;

string c = "";

while(i < sExpression.Length)

{

#region "

if (word != null && word != "")

if (word.Substring(0,1) == "\"")

{

do

{

c = sExpression[i++].ToString();

if (c == "\"") { alist.Add(word + c); word = c = null; break;}

else { word += c; c = null; }

}while(i < sExpression.Length);

}

if (i > sExpression.Length -1)

{ alist.Add(word); alist.Add(c); word = c= null; break;}

#endregion

#region 字符判别

switch (c = sExpression[i++].ToString())

{

#region ( )

case "\"":

if (i > sExpression.Length -1)

{ alist.Add(word); alist.Add(c); word = c= null; break;}

else

{

word = c; c= null;

do

{ c = sExpression[i++].ToString();

if (c == "\"") { alist.Add(word + c); word = c = null; break;}

else { word += c; c = null; }

}while(i < sExpression.Length );

break;

}

case "(": alist.Add(word); alist.Add(c); word = c= null; break;

case ")": alist.Add(word); alist.Add(c); word = c= null; break;

case " ": alist.Add(word); word = c= null; break;

#endregion

#region + - * / %

case "+":

if (i > sExpression.Length -1)

{ alist.Add(word); alist.Add(c); word = c= null; }

else

switch (c = sExpression[i++].ToString())

{

case "+": alist.Add(word); alist.Add("++"); word = c= null; break;

case "=": alist.Add(word); alist.Add("+="); word = c= null; break;

default : alist.Add(word); alist.Add("+"); word = c= null; i--; break;

}

break;

case "-":

if (i > sExpression.Length -1)

{ alist.Add(word); alist.Add(c); word = c= null; }

else

switch (c = sExpression[i++].ToString())

{

case "-": alist.Add(word); alist.Add("--"); word = c= null; break;

case "=": alist.Add(word); alist.Add("-="); word = c= null; break;

default : alist.Add(word); alist.Add("-"); word = c= null;i--; break;

}

break;

case "*":

if (i > sExpression.Length -1)

{ alist.Add(word); alist.Add(c); word = c= null; }

else

switch (c = sExpression[i++].ToString())

{

case "=": alist.Add(word); alist.Add("*="); word = c= null; break;

default : alist.Add(word); alist.Add("*"); word = c= null; i--; break;

}

break;

case "/":

if (i > sExpression.Length -1)

{ alist.Add(word); alist.Add(c); word = c= null; }

else

switch (c = sExpression[i++].ToString())

{

case "=": alist.Add(word); alist.Add("/="); word = c= null; break;

default : alist.Add(word); alist.Add("/"); word = c= null;i--; break;

}

break;

case "%":

if (i > sExpression.Length -1)

{ alist.Add(word); alist.Add(c); word = c= null; }

else

switch (c = sExpression[i++].ToString())

{

case "=": alist.Add(word); alist.Add("%="); word = c= null; break;

default : alist.Add(word); alist.Add("%"); word = c= null; i--; break;

}

break;

#endregion

#region > < =

case ">":

if (i > sExpression.Length -1)

{ alist.Add(word); alist.Add(c); word = c= null; }

else

switch (c = sExpression[i++].ToString())

{

case ">": alist.Add(word); alist.Add(">>"); word = c= null; break;

case "=": alist.Add(word); alist.Add(">="); word = c= null; break;

default : alist.Add(word); alist.Add(">"); word =c= null;i--; break;

}

break;

case "<":

if (i > sExpression.Length -1)

{ alist.Add(word); alist.Add(c); word = c= null; }

else

switch (c = sExpression[i++].ToString())

{

case "<": alist.Add(word); alist.Add("<<"); word = c= null; break;

case ">": alist.Add(word); alist.Add("<>"); word = c= null; break;

case "=": alist.Add(word); alist.Add("<="); word = c= null; break;

default : alist.Add(word); alist.Add("<"); word = c =null;i--; break;

}

break;

case "=":

if (i > sExpression.Length -1)

{ alist.Add(word); alist.Add(c); word = c= null; }

else

switch (c = sExpression[i++].ToString())

{

case "=": alist.Add(word); alist.Add("=="); word = c= null; break;

default : alist.Add(word); alist.Add("="); word = c=null;i--; break;

}

break;

#endregion

#region ! | &

case "!":

if (i > sExpression.Length -1)

{ alist.Add(word); alist.Add(c); word = c= null; }

else

switch (c = sExpression[i++].ToString())

{

case "=": alist.Add(word); alist.Add("!="); word = c= null; break;

default : alist.Add(word); alist.Add("!"); word = c=null;i--; break;

}

break;

case "|":

if (i > sExpression.Length -1)

{ alist.Add(word); alist.Add(c); word = c= null; }

else

switch (c = sExpression[i++].ToString())

{

case "=": alist.Add(word); alist.Add("|="); word = c= null; break;

case "|": alist.Add(word); alist.Add("||"); word = c= null; break;

default : alist.Add(word); alist.Add("|"); word =c= null;i--; break;

}

break;

case "&":

if (i > sExpression.Length -1)

{ alist.Add(word); alist.Add(c); word = c= null; }

else

switch (c = sExpression[i++].ToString())

{

case "=": alist.Add(word); alist.Add("&="); word = c= null; break;

case "&": alist.Add(word); alist.Add("&&"); word = c= null; break;

default : alist.Add(word); alist.Add("&"); word =c= null;i--; break;

}

break;

#endregion

default:

word += c;

break;

}

if (i == sExpression.Length) alist.Add(word);

#endregion

}

ArrayList alresult = new ArrayList();

foreach (object a in alist)

{

if (a == null) continue ;

if (a.ToString().Trim() == "") continue ;

alresult.Add(a);

}

return alresult;

}

/// <summary>

/// 对返回的表达式,已经分好放于ArrayList中的变量进行替换为实际常量

/// </summary>

/// <param name="alExpression"></param>

/// <param name="mapVar"></param>

/// <param name="mapValue"></param>

/// <returns></returns>

public static ArrayList ConvertExpression(ArrayList alExpression, string mapVar, string mapValue)

{

for (int i = 0; i < alExpression.Count; i++)

{

if (alExpression[i].ToString() == mapVar ) { alExpression[i] = mapValue; break; }

}

return alExpression;

}

/// <summary>

/// 对返回的表达式,已经分好放于ArrayList中的变量进行替换为实际常量

/// </summary>

/// <param name="alExpression"></param>

/// <param name="name"></param>

/// <param name="mapvalue"></param>

/// <returns></returns>

public static ArrayList ConvertExpression(ArrayList alExpression, string[] mapVar, string[] mapValue)

{

for (int i = 0; i < alExpression.Count; i++)

{

for (int j = 0; j< mapVar.Length; j++)

{

if (alExpression[i].ToString() == mapVar[j] )

{

alExpression[i] = mapValue[j];

break;

}

// System.Console.WriteLine("Expression: {0} >>> {1}",mapVar[j], mapValue[j]);

}

}

return alExpression;

}

#endregion

#region No02.后缀表达式方式 解析表达式

/// <summary>

/// 找出第一个闭括号

/// </summary>

/// <param name="alExpression"></param>

/// <returns></returns>

public static int Find_First_RightBracket(ArrayList alExpression)

{

for (int i = 0; i < alExpression.Count; i++)

{if (OperatorMap.CheckRightBracket(alExpression[i].ToString())) return i; }

return 0;

}

/// <summary>

/// 找出匹配的开括号

/// </summary>

/// <param name="alExpression"></param>

/// <param name="iRightBracket"></param>

/// <returns></returns>

public static int Find_Near_LeftBracket(ArrayList alExpression, int iRightBracket)

{

int i = iRightBracket - 2;

while ( i>= 0 )

{

if (OperatorMap.CheckLeftBracket(alExpression[i].ToString())) return i;

i--;

}

return 0;

}

/// <summary>

/// 中缀表达式转换为后缀表达式

/// </summary>

/// <param name="alexpression"></param>

/// <returns></returns>

public static ArrayList ConvertToPostfix(ArrayList alexpression)

{

ArrayList alOutput = new ArrayList();

Stack sOperator = new Stack();

string word = null;

int count = alexpression.Count;

int i = 0;

while (i < count)

{

word = alexpression[i++].ToString();

//·读到左括号时总是将它压入栈中

if (OperatorMap.CheckLeftBracket(word))

{ sOperator.Push(word); }

else

//·读到右括号时,将*近栈顶的第一个左括号上面的运算符全部依次弹出,送至输出队列后,再丢弃左括号。

if (OperatorMap.CheckRightBracket(word))

{

while (true)

{

if (sOperator.Count == 0) break;

string sTop = sOperator.Peek().ToString();

if (sTop == "(" ) { sOperator.Pop(); break;}

else alOutput.Add(sOperator.Pop());

}

}

else

//·当读到数字直接送至输出队列中

if (OperatorMap.IsVar(word))

{ alOutput.Add(word); }

else

//·当读到运算符t时,

//a.将栈中所有优先级高于或等于t的运算符弹出,送到输出队列中;

//b.t进栈

if (OperatorMap.CheckOperator(word))

{

while(sOperator.Count > 0)

{

string sPop = sOperator.Peek().ToString();

if (sPop =="(" ) break;

if (OperatorMap.GetMaxprior(word,sPop) >= 0)

{

// sPop = sOperator.Pop().ToString();

alOutput.Add(sOperator.Pop().ToString());

}

else

break;

// System.Console.WriteLine("XH{0}",sPop);

}

sOperator.Push(word);

}

// System.Console.WriteLine("{0}",word.ToString());

}

//中缀表达式全部读完后,若栈中仍有运算符,将其送到输出队列中

while (sOperator.Count > 0)

{

string s = sOperator.Pop().ToString();

alOutput.Add(s);

// System.Console.WriteLine("{0}:{1}",sOperator.Count,s.ToString());

}

return alOutput;

}

/// <summary>

/// 计算后缀表达式

/// </summary>

/// <param name="alexpression"></param>

/// <returns></returns>

public static object ComputePostfix(ArrayList alexpression)

{

try

{

//·建立一个栈S

Stack s = new Stack();

int count = alexpression.Count;

int i = 0;

while (i < count)

{

//·从左到右读后缀表达式,读到数字就将它转换为数值压入栈S中,

string word = alexpression[i++].ToString();

if (OperatorMap.IsVar(word))

{

s.Push(word);

// System.Console.WriteLine("Push:{0}",word);

}

else//读到运算符则从栈中依次弹出两个数分别到Y和X,

if (OperatorMap.CheckOperator(word))

{

string y,x,sResult;

if (!CheckOneOperator(word))

{

y = s.Pop().ToString();

x = s.Pop().ToString();

//然后以“X 运算符 Y”的形式计算机出结果,再压加栈S中

sResult = ComputeTwo(x,y,word).ToString();

s.Push(sResult);

}

else

{

x = s.Pop().ToString();

sResult = ComputeOne(x, word).ToString();

s.Push(sResult);

}

}

}

string spop = s.Pop().ToString();

// System.Console.WriteLine("Result:{0}",spop);

return spop;

}

catch

{

System.Console.WriteLine("Result:表达式不符合运算规则!Sorry!");

return "Sorry!Error!";

}

}

public static object ComputeExpression(string sExpression)

{

return Expression.ComputePostfix(Expression.ConvertToPostfix(Expression.ConvertExpression(sExpression)));

}

public static object ComputeExpression(string sExpression, string mapVar, string mapValue)

{

return Expression.ComputePostfix(Expression.ConvertToPostfix(Expression.ConvertExpression(Expression.ConvertExpression(sExpression),mapVar,mapValue)));

}

public static object ComputeExpression(string sExpression, string[] mapVar, string[] mapValue)

{

return Expression.ComputePostfix(Expression.ConvertToPostfix(Expression.ConvertExpression(Expression.ConvertExpression(sExpression),mapVar,mapValue)));

}

#endregion

#region No03. 简单无括号表达式的计算

#region 检查字符可以转换的类型

public static bool CheckNumber(string str)

{

try { Convert.ToDouble(str); return true; }

catch{return false;}

}

public static bool CheckBoolean(string str)

{

try { Convert.ToBoolean(str); return true; }

catch{return false;}

}

public static bool CheckString(string str)

{

try

{

str = str.Replace("\"","");

char c = (char)(str[0]);

if ((c >= 'a') && (c <= 'z') || (c >= 'A') && (c <= 'Z'))

return true;

else

return false;

}

catch{ return false;}

}

public static bool CheckOneOperator(string sOperator)

{

if (sOperator == "++" || sOperator =="--" || sOperator == "!")

return true;

else

return false;

}

#endregion

#region 双目运算

public static object ComputeTwoNumber(double dL, double dR, string sO)

{

switch (sO)

{

case "+": return (dL + dR);

case "-": return (dL - dR);

case "*": return (dL * dR);

case "%": return (dL % dR);

case "/": try{return (dL / dR);}

catch

{

return false;

//return "ComputeTwoNumber ["+sO+"] Sorry!";

}

case "+=": return (dL += dR);

case "-=": return (dL -= dR);

case "*=": return (dL *= dR);

case "/=": try{return (dL /= dR);}

catch

{

return false;

//return "ComputeTwoNumber ["+sO+"] Sorry!";

}

case "=": return (dL == dR);

case "==": return (dL == dR);

case "!=": return (dL != dR);

case "<>": return (dL != dR);

case ">": return (dL.CompareTo(dR) > 0);

case ">=": return (dL.CompareTo(dR) >= 0);

case "<": return (dL.CompareTo(dR) < 0);

case "<=": return (dL.CompareTo(dR) <= 0);

case ">>": return (int)dL >> (int)dR;

case "<<": return (int)dL << (int)dR;

case "|": return (int)dL | (int)dR;

case "&": return (int)dL & (int)dR;

case "|=":

{

int iL = (int)dL;

int iR = (int)dR;

return iL |= iR;

}

case "&=":

{

int iL = (int)dL;

int iR = (int)dR;

return iL &= iR;

}

default :

return false;

//return "ComputeTwoNumber ["+sO+"] Sorry!";

}

}

public static object ComputeTwoBoolean(bool bL, bool bR , string sO)

{

switch (sO)

{

case ">": return bL.CompareTo(bR) > 0 ;

case ">=": return bL.CompareTo(bR) >= 0 ;

case "<": return bL.CompareTo(bR) < 0 ;

case "<=": return bL.CompareTo(bR) <= 0 ;

case "=": return bL == bR ;

case "==": return bL == bR ;

case "!=": return bL != bR ;

case "<>": return bL != bR ;

case "||": return bL || bR ;

case "&&": return bL && bR ;

default : return false;

//return "ComputeTwoBoolean ["+sO+"] Sorry!";

}

}

public static object ComputeTwoString(string sL, string sR, string sO)

{

switch (sO)

{

case "+": return sL + sR;

case "=": return (sL == sR);

case "==": return (sL == sR);

case "!=": return (sL != sR);

case "<>": return (sL != sR);

case ">": return (sL.CompareTo(sR) > 0);

case ">=": return (sL.CompareTo(sR) >= 0);

case "<": return (sL.CompareTo(sR) < 0);

case "<=": return (sL.CompareTo(sR) <= 0);

default : return false;

//return "ComputeTwoString ["+sO+"] Sorry!";

}

}

public static object ComputeTwo(string sL, string sR, string sO)

{

if (CheckNumber(sL))

{

if (CheckNumber(sR))

return ComputeTwoNumber(Convert.ToDouble(sL),Convert.ToDouble(sR),sO);

else

if (CheckString(sR)) return ComputeTwoString(sL,sR,sO);

}

else if (CheckBoolean(sL))

{

if (CheckBoolean(sR))

return ComputeTwoBoolean(Convert.ToBoolean(sL),Convert.ToBoolean(sR),sO);

else

if (CheckString(sR)) return ComputeTwoString(sL,sR,sO);

}

else if (CheckString(sL)) return ComputeTwoString(sL,sR,sO);

return "ComputeTwo ["+sL+"]["+sO+"]["+sR+"] Sorry!";

}

#endregion

#region 单目运算

public static object ComputeOneNumber(double dou, string sO)

{

switch (sO)

{

case "++": return (dou + 1);

case "--": return (dou - 1);

default : return false;

//return "ComputeOneNumber ["+sO+"] Sorry!";

}

}

public static object ComputeOneString(string str, string sO)

{

switch (sO)

{

case "++": return (str + str);

default : return false;

//return "ComputeOneString ["+sO+"] Sorry!";

}

}

public static object ComputeOneBoolean(bool bo, string sO)

{

switch (sO)

{

case "!": return (!bo);

default : return false;

// return "ComputeOneBoolean ["+sO+"] Sorry!";

}

}

public static object ComputeOne(string str, string sO)

{

if (CheckNumber(str))

return ComputeOneNumber(Convert.ToDouble(str),sO);

if (CheckBoolean(str))

return ComputeOneBoolean(Convert.ToBoolean(str),sO);

if (CheckString(str))

return ComputeOneString(str,sO);

return "ComputerOne ["+str+"]["+sO+"] Sorry!";

}

#endregion

#endregion

#region No04. 实用工具类

/// <summary>

/// ArrayList子集操作

/// </summary>

public class ArrayListCopy

{

private ArrayListCopy(){}

/// <summary>

/// 返回ArrayList子集{L--R}内容

/// </summary>

/// <param name="alist"></param>

/// <param name="iLeft"></param>

/// <param name="iRight"></param>

/// <returns></returns>

public static ArrayList CopyBewteenTo(ArrayList alist, int iLeft, int iRight)

{

ArrayList alResult = new ArrayList();

bool b = false;

for (int i = iLeft; i < iRight; i++)

{

alResult.Add(alist[i]);

b = true;

}

if (b) return alResult;

else return null;

}

/// <summary>

/// 返回ArrayList子集{L--R}的补集内容

/// </summary>

/// <param name="alist"></param>

/// <param name="iLeft"></param>

/// <param name="iRight"></param>

/// <returns></returns>

public static ArrayList CopyNotBetweenTo(ArrayList alist, int iLeft, int iRight)

{

ArrayList alResult = new ArrayList();

bool b = false;

for (int i = 0; i < iLeft - 1; i++)

{

alResult.Add(alist[i]);

b = true;

}

if (b)

{

alResult.Add("@");

for (int i = iRight + 1; i < alist.Count; i++)

{

alResult.Add(alist[i]);

b = true;

}

}

if (b) return alResult;

else return null;

}

/// <summary>

/// 统计字符串sin在str中出现的次数

/// </summary>

/// <param name="str"></param>

/// <param name="sin"></param>

/// <returns></returns>

public static int GetSubStringCount(string str, string sin)

{

int i = 0;

int ibit = 0;

while (true)

{

ibit = str.IndexOf(sin, ibit);

if (ibit > 0 )

{

ibit += sin.Length;

i++;

}

else

{

break;

}

}

return i;

}

}

/// <summary>

/// 算符的优先级实体

/// </summary>

public class OperatorMap

{

public struct Map

{

public int Priority;

public string Operator;

public Map(int iPrior, string sOperator)

{

Priority = iPrior;

Operator = sOperator;

}

}

private OperatorMap(){ }

public static Map[] map()

{

Map[] om;

om = new Map[30];

om[0] = new Map(5,"*");

om[1] = new Map(5,"/");

om[29] = new Map(5,"%");

om[2] = new Map(10,"+");

om[3] = new Map(10,"-");

om[4] = new Map(20, ">");

om[5] = new Map(20, ">=");

om[6] = new Map(20, "<");

om[7] = new Map(20, "<=");

om[8] = new Map(20, "<>");

om[9] = new Map(20, "!=");

om[10] = new Map(20, "==");

om[11] = new Map(20, "=");

om[12] = new Map(41, "!");

om[13] = new Map(42, "||");

om[14] = new Map(43, "&&");

om[15] = new Map(40, "++");

om[16] = new Map(40, "--");

om[17] = new Map(40, "+=");

om[18] = new Map(40, "-=");

om[19] = new Map(40, "*=");

om[20] = new Map(40, "/=");

om[21] = new Map(40, "&");

om[22] = new Map(40, "|");

om[23] = new Map(40, "&=");

om[24] = new Map(40, "|=");

om[25] = new Map(40, ">>");

om[26] = new Map(40, "<<");

om[27] = new Map(3,"(");

om[28] = new Map(3,")");

return om;

}

public static bool CheckLeftBracket(string str) { return ( str== "(");}

public static bool CheckRightBracket(string str){ return ( str== ")");}

public static bool CheckBracket(string str) { return ( str== "(" || str == ")"); }

public static bool CheckOperator(string scheck)

{

string[] Operator= {"+", "-", "*", "/", "%",

">", ">=", "<", "<=", "<>", "!=", "==", "=",

"!", "||", "&&",

"++", "--", "+=", "-=", "*=", "/=",

"&", "|", "&=", "|=",

">>", "<<",

")", "("

};

bool bl = false;

for (int i = 0; i < Operator.Length - 1; i++ ) { if (Operator[i] == scheck){bl = true; break;} }

return bl;

}

public static Map GetMap(string Operator)

{

if (CheckOperator(Operator)) foreach(Map tmp in map()){ if (tmp.Operator == Operator) return tmp; }

return new Map(99,Operator);

}

public static int Getprior(string Operator) { return GetMap(Operator).Priority; }

public static int GetMaxprior(string Loperator, string Roperator)

{return GetMap(Loperator).Priority - GetMap(Roperator).Priority;}

public static bool IsVar(string svar)

{

if ((svar[0] >= '0' && svar[0] <= '9' ) || (svar[0] >= 'a' && svar[0] <= 'z') || (svar[0] >='A' && svar[0] <='Z') )

return true;

else

return false;

}

}

#endregion

}

}

----------------------------------------------

τ 认识你会不会是一种错误

如果这是个错误 也应该是个美丽的错误

但愿这个错误能够一辈子

______________ζ浮云¢惊龙

 
 
 
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