marineparkclient/assets/script/Model/data/computed.ts

import { deepCopy } from "../../../common/net/CovertUtil";

class expTable{//表达式和表达式做符合表述
  pre:expTable|string|number = ""; 
  next:expTable|string|number = "";
  oper:string = "+";
  constructor(one?:expTable|string|number,two?:expTable|string|number,three?:string){
      this.pre = one||0;
      this.next = two||0;
      this.oper = three||"+";
  }
  
  calulate(){
    let preResult = 0;
    let nextResult = 0;
    if(this.pre instanceof expTable)
        preResult = this.pre.calulate()           
    else
        preResult = Number(this.pre)
    if(this.next instanceof expTable)
        nextResult = this.next.calulate()           
    else
        nextResult = Number(this.next)
    return calcExpressionWithSingleOperator(preResult,nextResult,this.oper)
  }
  changeParam(paramChar:string,param:number|undefined){
      if(param==undefined)return
      if(this.pre instanceof expTable)
        this.pre.changeParam(paramChar,param)  
      else if(this.pre==paramChar )          
        this.pre = param
      if(this.next instanceof expTable)
        this.next.changeParam(paramChar,param)  
      else if(this.next==paramChar )          
        this.next = param
  }
}

//字符串表达
/**计算没有括号的表达式的值(操作符限定为'+'、'-'、'*'、'/') et是字符串中包含的表达式对象*/
function calcExpressionWithoutQuote(expression:string,et:Array<expTable>):expTable {
    if ((expression.indexOf('(') > -1) || (expression.indexOf(')') > -1)) {
      return calcExpression(expression);
    }
    var operators:string[] = [];
    var nums:any[] = [];
    var lastOperatorIndex = -1;
    for (var i = 0; i < expression.length; i++) {
        var charAtIndex = expression.charAt(i);
        if (isOperatorChar(charAtIndex)) {
            operators[operators.length] = charAtIndex;
            let numStr = expression.substring(lastOperatorIndex + 1, i);
            if (numStr.search(/T</i) == -1 ) 
                nums[nums.length] = numStr
            else
            {
                let arIdx = Number(numStr.substring(2,3))
                nums[nums.length] = et[arIdx]
            }
              
            lastOperatorIndex = i;
        }
        if (i == (expression.length - 1) && lastOperatorIndex < i) {
          let numStr = expression.substring(lastOperatorIndex + 1, expression.length);
          if (numStr.search(/T</i) == -1 ) 
                nums[nums.length] = numStr
          else
          {
              let arIdx = Number(numStr.substring(2,3))
              nums[nums.length] = et[arIdx]
          }
        }
    }
    let calcResult = new expTable()
    if (operators.length <= 0 || nums.length <= 0) {
        calcResult.pre = expression;
        return calcResult
    }
    
    while (operators.indexOf('*') > -1 || operators.indexOf('/') > -1) {        
        operators.forEach(function (value, index) {
            if (value == '*' || value == '/') {
                // 拿到操作符位置。
                calcResult = new expTable(nums[index],nums[index+1],value)
                //var tempResult = calcExpressionWithSingleOperator(Number(nums[index]), Number(nums[index + 1]), value);
                operators.splice(index, 1);
                //yjk
                nums[index] = calcResult;
                nums.splice(index+1, 1);
                // nums.splice(index, 2, [tempResult]);
            }
        });
    }
    // 现在只剩下'+'、'-'了    
    if (operators.indexOf('+') > -1 || operators.indexOf('-') > -1) {
        for (var index = 0; index < operators.length; index++) {
          var value = operators[index];
          if (value == '+' || value == '-') {
            calcResult = new expTable(nums[index],nums[index+1],value)
            //calcResult = calcExpressionWithSingleOperator(calcResult, Number(nums[index + 1]), value);
          }
        }
        return calcResult;
    } else {
        return calcResult;
    }
  }
  
  /**
  
  * 计算只有一个操作符的表达式的值(操作符限定为'+'、'-'、'*'、'/')
  
  */
  
  function calcExpressionWithSingleOperator(num1:number, num2:number, operator:string) {
    if (operator == '+') return num1 * 1 + num2 * 1;
    if (operator == '-') return num1 * 1 - num2 * 1;
    if (operator == '*') return num1 * num2;
    if (operator == '/') return num1 / num2;
    return NaN;
  }
  
  
  
  /** 计算算术表达式的值 带参数的表达式(m,n,p)*/
  
  function calcExpression(expression:string) {
    let calcResult = new expTable()
    var EChangeData = new Array<expTable>()
    expression = expression.replace(/\s/g, '').replace(/÷/g, '/').replace(/x/g, '*').replace(/×/g, '*').replace(/X/g, '*');
    if (getCharCountInString(expression, '(') != getCharCountInString(expression, ')'))
        return calcResult;
    while (expression && (expression.indexOf('(') > -1) && (expression.indexOf(')') > -1)) {
        var firstRightQuoteIndex = expression.indexOf(')');
        var leftQuoteIndex = expression.indexOf('(');
        for (var i = leftQuoteIndex; i < firstRightQuoteIndex; i++) {
          if (expression.charAt(i) == '(') {
            leftQuoteIndex = i;
          }
        }
        var tempExpression = expression.substring(leftQuoteIndex + 1, firstRightQuoteIndex);
        let curCalcResult = calcExpressionWithoutQuote(tempExpression,EChangeData);
        EChangeData.push(curCalcResult)
        expression = expression.substring(0, leftQuoteIndex) + `T<${EChangeData.length-1}>` + expression.substring(firstRightQuoteIndex + 1, expression.length);//"E"特殊表达式
    }
    return calcExpressionWithoutQuote(expression,EChangeData);
  }
  /**获取字符串中某子字符串出现次数 */  
  function getCharCountInString(strings:string, chars:string) {
    return (strings.split(chars)).length - 1;
  }  
  /**判断字符是否是运算符 */
  function isOperatorChar(aimChar:string) {
    return '+-*/'.indexOf(aimChar) > -1;
  }

  /*计算表达式，带参数*/
  export default class ComputeExpression {      
      _expressModule:expTable = new expTable();//表达式
      constructor(expression:string){
          this._expressModule = calcExpression(expression)

      }
      getResualtByParam(m?:number,n?:number,p?:number,i?:number)
      {
          let tempExp = deepCopy(this._expressModule) as expTable
          tempExp.changeParam('m',m)
          tempExp.changeParam('n',n)
          tempExp.changeParam('p',p)
          tempExp.changeParam('i',i)
          return tempExp.calulate()
      }
  }