java - ANTLR4 Rule for one or more options *in order* -

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I have found a rule for matching the time period specified in the rule, time, months, days, hours, minutes and seconds . For example:

  • For 2 months,
  • 3 months, 5 days

    For example: 17 seconds

    but not:

    • 1 day, 1 month
    • 5 minutes, 2 hours

      My current rule is: 

        Duration: year = months of the year (LIST_DELIM months = unity months)? (LIST_DELIM days = integral days)? (LIST_DELIM hours = integral hours)? (LIST_DELIM minutes = INTEGER minutes)? (LIST_DELIM seconds = INTEGER seconds)? | Months = only one month (LIST_DELIM days = integral days)? (LIST_DELIM hours = integral hours)? (LIST_DELIM minutes = INTEGER minutes)? (LIST_DELIM seconds = INTEGER seconds)? | Day = Integer Day (LIST_DELIM hours = impermeable hours)? (LIST_DELIM minutes = INTEGER minutes)? (LIST_DELIM seconds = INTEGER seconds)? | Hours = integer hours (LIST_DELIM minutes = INTEGER minutes)? (LIST_DELIM seconds = INTEGER seconds)? | Min = INTEGER MINUTES (LIST_DELIM seconds = INTEGER SECONDS)? | Second = eccentric second;   
       It seems like a fair amount of redundancy is there any way to simplify it?  
        
       
       
       To match more grit in your grammar and read a listener or  
       For, you can create different parser rules so that you do not need to label them:  
        Duration: Year (',' month)? (',' day)? (',' Hours)? (',' Minute)? (',' Seconds)? | Months (',' days)? (',' Hours)? (',' Minute)? (',' Seconds)? | ... | Seconds; Year: In Years; Months: Best wishes in months; ... LIST_DELIM: ',';   
       A related question & amp; A:

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