function parseScheduleExpr()

in app/scripts/modules/core/utils/later/later.js [1407:1482]
65 lines of code
17 McCabe index (conditional complexity)

    function parseScheduleExpr(str) {
      pos = 0;
      input = str;
      error = -1;
      let r = recur();
      while (pos < input.length && error < 0) {
        let token = parseToken([ TOKENTYPES.every, TOKENTYPES.after, TOKENTYPES.before, TOKENTYPES.onthe, TOKENTYPES.on, TOKENTYPES.of, TOKENTYPES["in"], TOKENTYPES.at, TOKENTYPES.and, TOKENTYPES.except, TOKENTYPES.also ]);
        switch (token.type) {
         case TOKENTYPES.every:
          parseEvery(r);
          break;

         case TOKENTYPES.after:
          if (peek(TOKENTYPES.time).type !== undefined) {
            r.after(parseTokenValue(TOKENTYPES.time));
            r.time();
          } else {
            r.after(parseTokenValue(TOKENTYPES.rank));
            parseTimePeriod(r);
          }
          break;

         case TOKENTYPES.before:
          if (peek(TOKENTYPES.time).type !== undefined) {
            r.before(parseTokenValue(TOKENTYPES.time));
            r.time();
          } else {
            r.before(parseTokenValue(TOKENTYPES.rank));
            parseTimePeriod(r);
          }
          break;

         case TOKENTYPES.onthe:
          parseOnThe(r);
          break;

         case TOKENTYPES.on:
          r.on(parseRanges(TOKENTYPES.dayName)).dayOfWeek();
          break;

         case TOKENTYPES.of:
          r.on(parseRanges(TOKENTYPES.monthName)).month();
          break;

         case TOKENTYPES["in"]:
          r.on(parseRanges(TOKENTYPES.yearIndex)).year();
          break;

         case TOKENTYPES.at:
          r.on(parseTokenValue(TOKENTYPES.time)).time();
          while (checkAndParse(TOKENTYPES.and)) {
            r.on(parseTokenValue(TOKENTYPES.time)).time();
          }
          break;

         case TOKENTYPES.and:
          break;

         case TOKENTYPES.also:
          r.and();
          break;

         case TOKENTYPES.except:
          r.except();
          break;

         default:
          error = pos;
        }
      }
      return {
        schedules: r.schedules,
        exceptions: r.exceptions,
        error: error
      };
    }