HOUR
[
VLIB_HOUR:z   {<choice $z>}
]

VLIB_HOUR [
  ( VSUB_HOUR_NUMBERS:h ?o'clock ) {return([<hour $h>])}
  ( VSUB_HOUR_NUMBERS:h ?o'clock VSUB_AM_PM:a ) {return([<hour $h> <am_pm $a>])}
  ( ?( twelve ?o'clock ) noon ) {return([<hour 0> <am_pm "pm">])}  
  ( ?( twelve ?o'clock ) midnight ) {return([<hour 0> <am_pm "am">])}  
]

VSUB_HOUR_NUMBERS [
  VSUB_DIGIT_ONE_THRU_NINE:n {return(mul($n 100))}
  ten {return(1000)}
  eleven {return(1100)}
  twelve {return(0)}
]

VSUB_AM_PM [
  ( a m 
    ?VSUB_HOUR_IN_THE_MORNING
  ) {return("am")}
  ( p m 
    ?VSUB_HOUR_AT_NIGHT
  ) {return("pm")}
  VSUB_HOUR_IN_THE_MORNING {return("am")}
  VSUB_HOUR_AT_NIGHT {return("pm")}
]

VSUB_HOUR_IN_THE_MORNING [
  ( in the morning ) 
  ( this morning )
]

VSUB_HOUR_AT_NIGHT [
  ( at night ) 
  tonight
  ( [ ( in the ) this ] [ afternoon evening ] )
]

VSUB_DIGIT_TWO_THRU_NINE [
  two {return(2)}
  three {return(3)}
  four {return(4)}
  five {return(5)}
  six {return(6)}
  seven {return(7)}
  eight {return(8)}
  nine {return(9)}
]


VSUB_DIGIT_TWO_THRU_NINE_STRING [
  two {return("2")}
  three {return("3")}
  four {return("4")}
  five {return("5")}
  six {return("6")}
  seven {return("7")}
  eight {return("8")}
  nine {return("9")}
]

VSUB_DIGIT_ONE_THRU_NINE[
  one {return(1)}
  VSUB_DIGIT_TWO_THRU_NINE:n {return($n)}
]
VSUB_DIGIT_ONE_THRU_NINE_STRING [
  one {return("1")}
  VSUB_DIGIT_TWO_THRU_NINE_STRING:n {return($n)}
]

VSUB_DIGIT_STRING [
  [ zero oh ] {return("0")}
  VSUB_DIGIT_ONE_THRU_NINE_STRING:n {return($n)}
]

VSUB_TEEN_STRING [
  eleven {return("11")}
  twelve {return("12")}
  thirteen {return("13")}
  fourteen {return("14")}
  fifteen {return("15")}
  sixteen {return("16")}
  seventeen {return("17")}
  eighteen {return("18")}
  nineteen {return("19")}
]

VSUB_DECADE_STRING [
  twenty {return("2")}
  thirty {return("3")}
  forty {return("4")}
  fifty {return("5")}
  sixty {return("6")}
  seventy {return("7")}
  eighty {return("8")}
  ninety {return("9")}
]

VSUB_TEEN [
  eleven {return(11)}
  twelve {return(12)}
  thirteen {return(13)}
  fourteen {return(14)}
  fifteen {return(15)}
  sixteen {return(16)}
  seventeen {return(17)}
  eighteen {return(18)}
  nineteen {return(19)}
]

VSUB_DECADE [
  twenty {return(20)}
  thirty {return(30)}
  forty {return(40)}
  fifty {return(50)}
  sixty {return(60)}
  seventy {return(70)}
  eighty {return(80)}
  ninety {return(90)}
]