一些数据无法解析正确的表达式

[martian98]

错误复现

  let parser = require('cron-parser');

  let interval = parser.parseExpression('* * * */7 * *');
  var fields = JSON.parse(JSON.stringify(interval.fields)); 

  fields.dayOfMonth = [1,8,15,22,29];

  var modifiedInterval = parser.fieldsToExpression(fields,true);
  var cronString = modifiedInterval.stringify(true);
  console.log(cronString); //输出结果 "* * * 1-29/7 * *"

  //应当输出的结果 * * * */7 * *

通过查看源码发现 field_stringify.js ** 第13-15行**

  //这行判断导致无法正确解析
    if (step !== 1 && singleRange.start === min && singleRange.end === max - step + 1) { 
      return '*/' + step;
    }

修改代码如下:

    //修改之后即可正确解析    * * * */7 * *
    if (step !== 1 && singleRange.start === min && singleRange.end + step > max) {
    
      return '*/' + step;
    }

希望作者大大处理一下, 感谢!!!

[harrisiirak]

@martian98 thanks for reporting this. Probably also related to the suggestion provided here: #222 -- I'll investigate this when I've a bit more time.