package com.changhong.epc.count.service.system.performer.verify;

import java.util.Stack;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import static com.changhong.epc.bean.count.func.FunNameKey.FUNC_GET_VAL_PARAM_MASTER;

/**
 * 函数格式验证
 * 
 * @author wangZX
 *
 */
public class FuncFormatVerify {
	
	/**
	 * 处理特殊函数 02
	 * @param args
	 */
	public static String pretreatmentFun(String str) {
		// // System.out.println(FuncFormatVerify.partenMatch("(1+(2)*(1+2))=9")); [{|']?[^}|']+[}|']?
		String pattern = "[{][0-9]+[}][\\s]*[=][\\s]*(([{][0-9]+[}])|(['][^']+['])|([0-9]+))";

		Pattern r = Pattern.compile(pattern);
		Matcher m = r.matcher(str);
		while(m.find()){
			String group = m.group();
			String[] split = group.split("=");
			String funcName = FUNC_GET_VAL_PARAM_MASTER+"("  + split[0] + ", " + split[1] + ")";
			str = str.replace(group,  funcName);
		}
		return str;
	}
	
	/**
	 * 验证 括号是否匹配 01
	 * @param exp
	 * @return
	 */
	public static boolean partenMatchFun(String exp) {
		Stack<Character> stack = new Stack<Character>();
		for (int i = 0; i < exp.length(); i++) {
			switch (exp.charAt(i)) {
			case '{':
			case '(':
			case '[':
				stack.push(exp.charAt(i));
				break;
			case '}':
			case ')':
			case ']':
				if (stack.isEmpty())
					return false;
				if (!FuncFormatVerify.match(stack.pop(), exp.charAt(i)))
					return false;
				break;
			
			}
		}
		if (!stack.isEmpty())
			return false;
		return true;
	}

	private static boolean match(char strright, char strleft) {
		switch (strright) {
		case '{':
			if (strleft == '}')
				return true;
			break;
		case '(':
			if (strleft == ')')
				return true;
			break;
		case '[':
			if (strleft == ']')
				return true;
			break;
		default:
			break;
		}
		return false;
	}
}