针对[return -50],如果return后面跟一个负数值时程序解析错误

[truechuan]

@Test
public void testChange_1() throws Exception {
    ExpressRunner runner = RuleEngine.newInstance();
    IExpressContext<String, Object> context = new DefaultContext<String, Object>();
    context.put("test", 2.004);
    String test = "if(test > 0){return 50}";
    System.out.println(runner.execute(test, context, null, true, false));

    String test1 = "if(test > 0){return -50}";
    System.out.println(runner.execute(test1, context, null, true, false));
}

从测试用例得出test1执行失败，具体原因应该是在ExpressParse.transferWord2ExpressNode 对'-'这种特殊情况考虑不够。

[baoxingjie]

you are right,i have fixed the minus problem at version 3.1.5 ,here is the test
https://github.com/alibaba/QLExpress/blob/master/src/test/java/com/ql/util/express/test/MinusOperatorTest.java