package com.changhong.epc.parsing.service.transition.billInfo.formula;
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import com.changhong.epc.parsing.service.transition.billInfo.function.IFuncActuator;
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import com.changhong.epc.parsing.service.transition.billInfo.function.impl.FuncActuatorImpl;
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import com.changhong.epc.parsing.service.transition.billInfo.models.TransverterBillInfoPre;
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import lombok.extern.slf4j.Slf4j;
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import org.apache.commons.lang3.StringUtils;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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import javax.script.ScriptException;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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/**
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* 转换票据 公式解析器
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* @ClassName: ExpressionOarser
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* @author [九鼎联合科技]
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* @date 2017年7月23日 下午4:33:18
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*/
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@Slf4j
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public class ExpressionOarser {
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//条件
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private String condition;
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//元素函数表
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private String elementList;
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private IFuncActuator funcFactory = new FuncActuatorImpl();
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private List<Boolean> funResultList = new ArrayList<>();
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public ExpressionOarser(TransverterBillInfoPre pre) {
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condition = pre.getCondition();
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elementList = pre.getElementList();
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funcFactory.setDate(pre.getMatchingVal());
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}
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// ----- js
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ScriptEngineManager manager = new ScriptEngineManager();
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ScriptEngine engine = manager.getEngineByName("javascript");
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/**
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* @throws Exception
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* 执行表达式
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* @Title: execute
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* @param
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* @return void 返回类型
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* @throws
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*/
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public Boolean execute(){
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if(StringUtils.isBlank(condition)){
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return true;
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}
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try {
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log.debug("----------计算函数--------");
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// 1. 计算函数 ok
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funResultList = funcFactory.exeFunList(elementList);
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// 2. 填充表达式
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log.debug("----------填充表达式 --------");
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String fillParam = fillParam();
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// 3. 执行表达式
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log.debug("----------执行表达式 --------");
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return exeJS(fillParam);
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} catch (Exception e) {
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log.debug("----------匹配发生异常 --------");
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log.error(e.toString());
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return false;
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}
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}
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/**
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* 为表达式填充参数
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* @Title: addParam
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* @param @throws Exception 设定文件
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* @return void 返回类型
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* @throws
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*/
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public String fillParam(){
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Pattern pattern = Pattern.compile("[\\d]+");
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Map<String,String> indexRes = new HashMap<>();
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Matcher matcher = pattern.matcher(condition);
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int c = 97;
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while(matcher.find()){
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String group = matcher.group(),
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key = String.format("{%c}", c++);
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condition = condition.replaceFirst(group, key);
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indexRes.put(key, group);
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}
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// System.out.println(condition);
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for (String key : indexRes.keySet()) {
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// System.out.println();
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condition = condition.replace(key,
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" "+String.valueOf(
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funResultList.get(
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Integer.valueOf(indexRes.get(key))
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)) +" "
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);
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}
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condition = condition.replaceAll(" and ", " && ");
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condition = condition.replaceAll(" or ", " || ");
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return condition;
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}
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private Boolean exeJS(String exeStr){
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log.debug(exeStr);
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Boolean eval = false;
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try {
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eval = (Boolean) engine.eval(exeStr);
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} catch (ScriptException e) {
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// System.err.println(e.getMessage());
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}
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return eval;
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}
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}
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