horr

ible.js

function filterMails(mails, stat) {
  let matchingPredicate = _.filter(mails, (mail) => {
    let test = mail.predicate.split(' ')
    stat.cases = _.map(test, (filter) => {
      let operation = filter.split(/([=<>]{1,2})/g)
      if (operation.length && operation.length === 3) {
        let mainNum
        let comparator
        if (operation[0] === 'lastEntry') {
          // TODO: parse dates
        } else {
          mainNum = parseInt(stat[operation[0]], 10)
          comparator = parseInt(operation[2], 10)
        }
        switch (operation[1]) {
          case '<':
            return mainNum < comparator
          case '>':
            return mainNum > comparator
          case '=':
            return mainNum === comparator
          case '<=':
            return mainNum <= comparator
          case '>=':
            return mainNum >= comparator
          default:
            return false
        }
      }
      return operation
    })
    return _.every(stat.cases, Boolean)
   })
   return matchingPredicate
}