compromise/src/result/subset/dates/parseTime.js

natural language processing in the browser

'use strict';
//
const isHour = (num) => {
  if (num && num > 0 && num < 25) {
    return true;
  }
  return false;
};
const isMinute = (num) => {
  if (num && num > 0 && num < 60) {
    return true;
  }
  return false;
};


const parseTime = (r) => {
  let result = {
    logic: null,
    hour: null,
    minute: null,
    second: null,
    timezone: null
  };

  let logic = r.match('(by|before|for|during|at|until|after) #Time').firstTerm();
  if (logic.found) {
    result.logic = logic.normal();
  }

  let time = r.match('#Time');
  time.forEachTerms((t) => {
    //3pm
    let m = t.text.match(/([12]?[0-9]) ?(am|pm)/i);
    if (m) {
      result.hour = parseInt(m[1], 10);
      if (m[2] === 'pm') {
        result.hour += 12;
      }
      if (!isHour(result.hour)) {
        result.hour = null;
      }
    }
    //3:15
    m = t.text.match(/([12]?[0-9]):([0-9][0-9]) ?(am|pm)?/i);
    if (m) {
      result.hour = parseInt(m[1], 10);
      result.minute = parseInt(m[2], 10);
      if (!isMinute(result.minute)) {
        result.minute = null;
      }
      if (m[3] === 'pm') {
        result.hour += 12;
      }
      if (!isHour(result.hour)) {
        result.hour = null;
      }
    }
  });
  return result;
};
module.exports = parseTime;