662 lines
22 KiB
Factor
662 lines
22 KiB
Factor
! Copyright (C) 2008 Doug Coleman.
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! See http://factorcode.org/license.txt for BSD license.
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USING: arrays kernel math strings help.markup help.syntax
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math.order ;
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IN: calendar
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HELP: duration
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{ $description "A duration is a period of time years, months, days, hours, minutes, and seconds. All duration slots can store " { $link real } " numbers. Compare two durations with the " { $link <=> } " word." } ;
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HELP: timestamp
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{ $description "A timestamp is a date and a time with a timezone offset. Timestamp slots must store integers except for " { $snippet "seconds" } ", which stores reals, and " { $snippet "gmt-offset" } ", which stores a " { $link duration } ". Compare two durations with the " { $link <=> } " word." } ;
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{ timestamp duration } related-words
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HELP: gmt-offset-duration
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{ $values { "duration" duration } }
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{ $description "Returns a " { $link duration } " object with the GMT offset returned by " { $link gmt-offset } "." } ;
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HELP: <date>
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{ $values { "year" integer } { "month" integer } { "day" integer } { "timestamp" timestamp } }
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{ $description "Returns a timestamp object representing the start of the specified day in your current timezone." }
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{ $examples
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{ $example "USING: accessors calendar prettyprint ;"
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"2010 12 25 <date> instant >>gmt-offset ."
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"T{ timestamp { year 2010 } { month 12 } { day 25 } }"
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}
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} ;
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HELP: month-names
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{ $values { "value" object } }
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{ $description "Returns an array with the English names of all the months." }
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{ $warning "Do not use this array for looking up a month name directly. Use month-name instead." } ;
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HELP: month-name
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{ $values { "obj" { $or integer timestamp } } { "string" string } }
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{ $description "Looks up the month name and returns it as a string. January has an index of 1 instead of zero." } ;
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HELP: month-abbreviations
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{ $values { "value" array } }
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{ $description "Returns an array with the English abbreviated names of all the months." }
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{ $warning "Do not use this array for looking up a month name directly. Use month-abbreviation instead." } ;
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HELP: month-abbreviation
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{ $values { "n" integer } { "string" string } }
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{ $description "Looks up the abbreviated month name and returns it as a string. January has an index of 1 instead of zero." } ;
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HELP: day-names
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{ $values { "value" array } }
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{ $description "Returns an array with the English names of the days of the week." } ;
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HELP: day-name
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{ $values { "obj" { $or integer timestamp } } { "string" string } }
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{ $description "Looks up the day name and returns it as a string." } ;
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HELP: day-abbreviations2
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{ $values { "value" array } }
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{ $description "Returns an array with the abbreviated English names of the days of the week. This abbreviation is two characters long." } ;
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HELP: day-abbreviation2
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{ $values { "n" integer } { "string" string } }
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{ $description "Looks up the abbreviated day name and returns it as a string. This abbreviation is two characters long." } ;
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HELP: day-abbreviations3
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{ $values { "value" array } }
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{ $description "Returns an array with the abbreviated English names of the days of the week. This abbreviation is three characters long." } ;
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HELP: day-abbreviation3
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{ $values { "n" integer } { "string" string } }
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{ $description "Looks up the abbreviated day name and returns it as a string. This abbreviation is three characters long." } ;
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{
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day-name day-names
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day-abbreviation2 day-abbreviations2
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day-abbreviation3 day-abbreviations3
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} related-words
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HELP: average-month
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{ $values { "value" ratio } }
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{ $description "The length of an average month averaged over 400 years. Used internally for adding an arbitrary real number of months to a timestamp." } ;
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HELP: months-per-year
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{ $values { "value" integer } }
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{ $description "Returns the number of months in a year." } ;
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HELP: days-per-year
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{ $values { "value" ratio } }
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{ $description "Returns the number of days in a year averaged over 400 years. Used internally for adding an arbitrary real number of days to a timestamp." } ;
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HELP: hours-per-year
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{ $values { "value" ratio } }
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{ $description "Returns the number of hours in a year averaged over 400 years. Used internally for adding an arbitrary real number of hours to a timestamp." } ;
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HELP: minutes-per-year
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{ $values { "value" ratio } }
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{ $description "Returns the number of minutes in a year averaged over 400 years. Used internally for adding an arbitrary real number of minutes to a timestamp." } ;
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HELP: seconds-per-year
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{ $values { "value" integer } }
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{ $description "Returns the number of seconds in a year averaged over 400 years. Used internally for adding an arbitrary real number of seconds to a timestamp." } ;
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HELP: julian-day-number
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{ $values { "year" integer } { "month" integer } { "day" integer } { "n" integer } }
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{ $description "Calculates the Julian day number from a year, month, and day. The difference between two Julian day numbers is the number of days that have elapsed between the two corresponding dates." }
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{ $warning "Not valid before year -4800 BCE." } ;
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HELP: julian-day-number>date
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{ $values { "n" integer } { "year" integer } { "month" integer } { "day" integer } }
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{ $description "Converts from a Julian day number back to a year, month, and day." } ;
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{ julian-day-number julian-day-number>date } related-words
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HELP: >date<
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{ $values { "timestamp" timestamp } { "year" integer } { "month" integer } { "day" integer } }
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{ $description "Explodes a " { $snippet "timestamp" } " into its year, month, and day components." }
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{ $examples { $example "USING: arrays calendar prettyprint ;"
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"2010 8 24 <date> >date< 3array ."
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"{ 2010 8 24 }"
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}
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} ;
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HELP: >time<
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{ $values { "timestamp" timestamp } { "hour" integer } { "minute" integer } { "second" integer } }
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{ $description "Explodes a " { $snippet "timestamp" } " into its hour, minute, and second components." }
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{ $examples { $example "USING: arrays calendar prettyprint ;"
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"now noon >time< 3array ."
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"{ 12 0 0 }"
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}
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} ;
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{ >date< >time< } related-words
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HELP: instant
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{ $values { "duration" duration } }
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{ $description "Pushes a " { $snippet "duration" } " of zero seconds." } ;
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HELP: years
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{ $values { "x" number } { "duration" duration } }
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{ $description "Creates a duration object with the specified number of years." } ;
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HELP: months
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{ $values { "x" number } { "duration" duration } }
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{ $description "Creates a duration object with the specified number of months." } ;
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HELP: days
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{ $values { "x" number } { "duration" duration } }
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{ $description "Creates a duration object with the specified number of days." } ;
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HELP: weeks
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{ $values { "x" number } { "duration" duration } }
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{ $description "Creates a duration object with the specified number of weeks." } ;
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HELP: hours
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{ $values { "x" number } { "duration" duration } }
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{ $description "Creates a duration object with the specified number of hours." } ;
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HELP: minutes
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{ $values { "x" number } { "duration" duration } }
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{ $description "Creates a duration object with the specified number of minutes." } ;
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HELP: seconds
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{ $values { "x" number } { "duration" duration } }
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{ $description "Creates a duration object with the specified number of seconds." } ;
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HELP: milliseconds
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{ $values { "x" number } { "duration" duration } }
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{ $description "Creates a duration object with the specified number of milliseconds." } ;
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HELP: microseconds
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{ $values { "x" number } { "duration" duration } }
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{ $description "Creates a duration object with the specified number of microseconds." } ;
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HELP: nanoseconds
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{ $values { "x" number } { "duration" duration } }
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{ $description "Creates a duration object with the specified number of nanoseconds." } ;
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{ years months days hours minutes seconds milliseconds microseconds nanoseconds } related-words
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HELP: leap-year?
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{ $values { "obj" object } { "?" "a boolean" } }
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{ $description "Returns " { $link t } " if the object represents a leap year." }
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{ $examples
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{ $example "USING: calendar prettyprint ;"
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"2008 leap-year? ."
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"t"
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}
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{ $example "USING: calendar prettyprint ;"
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"2010 1 1 <date> leap-year? ."
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"f"
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}
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} ;
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HELP: time+
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{ $values { "time1" "timestamp or duration" } { "time2" "timestamp or duration" } { "time3" "timestamp or duration" } }
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{ $description "Adds two durations to produce a duration or adds a timestamp and a duration to produce a timestamp. The calculation takes timezones into account." }
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{ $examples
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{ $example "USING: calendar math.order prettyprint ;"
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"10 months 2 months time+ 1 years <=> ."
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"+eq+"
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}
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{ $example "USING: accessors calendar math.order prettyprint ;"
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"2010 1 1 <date> 3 days time+ day>> ."
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"4"
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}
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} ;
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HELP: duration>years
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{ $values { "duration" duration } { "x" number } }
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{ $description "Calculates the length of a duration in years." }
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{ $examples
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{ $example "USING: calendar prettyprint ;"
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"6 months duration>years ."
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"1/2"
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}
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} ;
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HELP: duration>months
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{ $values { "duration" duration } { "x" number } }
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{ $description "Calculates the length of a duration in months." }
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{ $examples
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{ $example "USING: calendar prettyprint ;"
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"30 days duration>months ."
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"16000/16233"
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}
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} ;
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HELP: duration>days
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{ $values { "duration" duration } { "x" number } }
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{ $description "Calculates the length of a duration in days." }
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{ $examples
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{ $example "USING: calendar prettyprint ;"
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"6 hours duration>days ."
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"1/4"
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}
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} ;
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HELP: duration>hours
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{ $values { "duration" duration } { "x" number } }
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{ $description "Calculates the length of a duration in hours." }
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{ $examples
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{ $example "USING: calendar prettyprint ;"
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"3/4 days duration>hours ."
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"18"
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}
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} ;
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HELP: duration>minutes
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{ $values { "duration" duration } { "x" number } }
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{ $description "Calculates the length of a duration in minutes." }
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{ $examples
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{ $example "USING: calendar prettyprint ;"
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"6 hours duration>minutes ."
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"360"
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}
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} ;
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HELP: duration>seconds
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{ $values { "duration" duration } { "x" number } }
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{ $description "Calculates the length of a duration in seconds." }
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{ $examples
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{ $example "USING: calendar prettyprint ;"
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"6 minutes duration>seconds ."
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"360"
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}
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} ;
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HELP: duration>milliseconds
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{ $values { "duration" duration } { "x" number } }
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{ $description "Calculates the length of a duration in milliseconds." }
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{ $examples
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{ $example "USING: calendar prettyprint ;"
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"6 seconds duration>milliseconds ."
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"6000"
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}
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} ;
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HELP: duration>microseconds
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{ $values { "duration" duration } { "x" number } }
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{ $description "Calculates the length of a duration in microseconds." }
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{ $examples
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{ $example "USING: calendar prettyprint ;"
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"6 seconds duration>microseconds ."
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"6000000"
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}
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} ;
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HELP: duration>nanoseconds
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{ $values { "duration" duration } { "x" number } }
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{ $description "Calculates the length of a duration in nanoseconds." }
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{ $examples
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{ $example "USING: calendar prettyprint ;"
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"6 seconds duration>nanoseconds ."
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"6000000000"
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}
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} ;
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{ duration>years duration>months duration>days duration>hours duration>minutes duration>seconds duration>milliseconds duration>microseconds duration>nanoseconds } related-words
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HELP: time-
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{ $values { "time1" "timestamp or duration" } { "time2" "timestamp or duration" } { "time3" "timestamp or duration" } }
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{ $description "Subtracts two durations to produce a duration or subtracts a duration from a timestamp to produce a timestamp. The calculation takes timezones into account." }
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{ $examples
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{ $example "USING: calendar math.order prettyprint ;"
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"10 months 2 months time- 8 months <=> ."
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"+eq+"
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}
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{ $example "USING: accessors calendar math.order prettyprint ;"
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"2010 1 1 <date> 3 days time- day>> ."
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"29"
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}
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} ;
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HELP: convert-timezone
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{ $values { "timestamp" timestamp } { "duration" duration } { "timestamp'" timestamp } }
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{ $description "Converts the " { $snippet "timestamp" } "'s " { $snippet "gmt-offset" } " to the GMT offset represented by the " { $snippet "duration" } "." }
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{ $examples
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{ $example "USING: accessors calendar prettyprint ;"
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"gmt noon instant -5 >>hour convert-timezone gmt-offset>> hour>> ."
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"-5"
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}
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} ;
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HELP: >local-time
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{ $values { "timestamp" timestamp } { "timestamp'" timestamp } }
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{ $description "Converts the " { $snippet "timestamp" } " to the timezone of your computer." }
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{ $examples
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{ $example "USING: accessors calendar kernel prettyprint ;"
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"now gmt >local-time [ gmt-offset>> ] bi@ = ."
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"t"
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}
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} ;
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HELP: >gmt
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{ $values { "timestamp" timestamp } { "timestamp'" timestamp } }
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{ $description "Converts the " { $snippet "timestamp" } " to the GMT timezone." }
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{ $examples
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{ $example "USING: accessors calendar kernel prettyprint ;"
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"now >gmt gmt-offset>> hour>> ."
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"0"
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}
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} ;
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HELP: time*
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{ $values { "obj1" object } { "obj2" object } { "obj3" object } }
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{ $description "Multiplies each time slot of a timestamp or duration by a number and make a new duration from the result. Used in the implementation of " { $link before } "." } ;
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{ time+ time- time* } related-words
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HELP: before
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{ $values { "duration" duration } { "-duration" duration } }
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{ $description "Negates a duration." }
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{ $examples
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{ $example "USING: accessors calendar prettyprint ;"
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"3 hours before now noon time+ hour>> ."
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"9"
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}
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} ;
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HELP: <zero>
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{ $values { "timestamp" timestamp } }
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{ $description "Returns a zero timestamp that consists of zeros for every slot. Used to see if timestamps are valid." } ;
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HELP: valid-timestamp?
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{ $values { "timestamp" timestamp } { "?" "a boolean" } }
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{ $description "Tests if a timestamp is valid or not." } ;
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HELP: unix-1970
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{ $values { "timestamp" timestamp } }
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{ $description "Returns the beginning of UNIX time, or midnight, January 1, 1970." } ;
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HELP: micros>timestamp
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{ $values { "x" number } { "timestamp" timestamp } }
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{ $description "Converts a number of microseconds into a timestamp value in GMT time." }
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{ $examples
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{ $example "USING: accessors calendar prettyprint ;"
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"1000 micros>timestamp year>> ."
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"1970"
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}
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} ;
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HELP: gmt
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{ $values { "timestamp" timestamp } }
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{ $description "Returns the time right now, but in the GMT timezone." } ;
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{ gmt now } related-words
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HELP: now
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{ $values { "timestamp" timestamp } }
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{ $description "Returns the time right now in your computer's timezone." }
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{ $examples
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{ $unchecked-example "USING: calendar prettyprint ;"
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"now ."
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"T{ timestamp f 2008 9 1 16 38 24+801/1000 T{ duration f 0 0 0 -5 0 0 } }"
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}
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} ;
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HELP: hence
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{ $values { "duration" duration } { "timestamp" timestamp } }
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{ $description "Computes a time in the future that is the " { $snippet "duration" } " added to the result of " { $link now } "." }
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{ $examples
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{ $unchecked-example
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"USING: calendar prettyprint ;"
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"10 hours hence ."
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"T{ timestamp f 2008 9 2 2 47 45+943/1000 T{ duration f 0 0 0 -5 0 0 } }"
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}
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} ;
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HELP: ago
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{ $values { "duration" duration } { "timestamp" timestamp } }
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{ $description "Computes a time in the past that is the " { $snippet "duration" } " subtracted from the result of " { $link now } "." }
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{ $examples
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{ $unchecked-example
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"USING: calendar prettyprint ;"
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"3 weeks ago ."
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"T{ timestamp f 2008 8 11 16 49 52+99/500 T{ duration f 0 0 0 -5 0 0 } }"
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}
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} ;
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HELP: zeller-congruence
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{ $values { "year" integer } { "month" integer } { "day" integer } { "n" integer } }
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{ $description "An implementation of an algorithm that computes the day of the week given a date. Days are indexed starting from Sunday, which is index 0." }
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{ $notes "User code should use the " { $link day-of-week } " word, which takes a " { $snippet "timestamp" } " instead of integers." } ;
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HELP: days-in-year
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{ $values { "obj" "a timestamp or an integer" } { "n" integer } }
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{ $description "Calculates the number of days in a given year." }
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{ $examples
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{ $example "USING: calendar prettyprint ;"
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"2004 days-in-year ."
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"366"
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}
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} ;
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HELP: days-in-month
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{ $values { "timestamp" timestamp } { "n" integer } }
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{ $description "Calculates the number of days in a given month." }
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{ $examples
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{ $example "USING: calendar prettyprint ;"
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"2008 8 24 <date> days-in-month ."
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"31"
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}
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} ;
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HELP: day-of-week
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{ $values { "timestamp" timestamp } { "n" integer } }
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{ $description "Calculates the index of the day of the week. Sunday will result in an index of 0." }
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{ $examples
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{ $example "USING: calendar prettyprint ;"
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"now sunday day-of-week ."
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"0"
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}
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} ;
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HELP: day-of-year
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{ $values { "timestamp" timestamp } { "n" integer } }
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{ $description "Calculates the day of the year, resulting in a number from 1 to 366 (leap years)." }
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{ $examples
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{ $example "USING: calendar prettyprint ;"
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"2008 1 4 <date> day-of-year ."
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"4"
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}
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} ;
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HELP: sunday
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{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
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{ $description "Returns the Sunday from the current week, which starts on a Sunday." } ;
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HELP: monday
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{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
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{ $description "Returns the Monday from the current week, which starts on a Sunday." } ;
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HELP: tuesday
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{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
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{ $description "Returns the Tuesday from the current week, which starts on a Sunday." } ;
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HELP: wednesday
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{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
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{ $description "Returns the Wednesday from the current week, which starts on a Sunday." } ;
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HELP: thursday
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{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
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{ $description "Returns the Thursday from the current week, which starts on a Sunday." } ;
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HELP: friday
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{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
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{ $description "Returns the Friday from the current week, which starts on a Sunday." } ;
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HELP: saturday
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{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
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{ $description "Returns the Saturday from the current week, which starts on a Sunday." } ;
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{ sunday monday tuesday wednesday thursday friday saturday } related-words
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HELP: midnight
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{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
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{ $description "Returns a new timestamp that represents today at midnight, or the beginning of the day." } ;
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HELP: noon
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{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
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{ $description "Returns a new timestamp that represents today at noon, or the middle of the day." } ;
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HELP: beginning-of-month
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{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
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{ $description "Returns a new timestamp with the day set to one." } ;
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HELP: beginning-of-week
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{ $values { "timestamp" timestamp } { "new-timestamp" timestamp } }
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{ $description "Returns a new timestamp where the day of the week is Sunday." } ;
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HELP: beginning-of-year
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{ $values { "object" object } { "new-timestamp" timestamp } }
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{ $description "Returns a new timestamp with the month and day set to one, or January 1 of the input timestamp, given a year or a timestamp." } ;
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HELP: time-since-midnight
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{ $values { "timestamp" timestamp } { "duration" duration } }
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{ $description "Calculates a " { $snippet "duration" } " that represents the elapsed time since midnight of the input " { $snippet "timestamp" } "." } ;
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HELP: since-1970
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{ $values
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{ "duration" duration }
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{ "timestamp" timestamp } }
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{ $description "Adds the duration to the beginning of Unix time and returns the result as a timestamp." } ;
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ARTICLE: "calendar" "Calendar"
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"The two data types used throughout the calendar library:"
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{ $subsections
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timestamp
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duration
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}
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"Durations represent spans of time:"
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{ $subsections "using-durations" }
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"Arithmetic on timestamps and durations:"
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{ $subsections "timestamp-arithmetic" }
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"Getting the current timestamp:"
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{ $subsections
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now
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gmt
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}
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"Converting between timestamps:"
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{ $subsections
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>local-time
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>gmt
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}
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"Converting between timezones:"
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{ $subsections convert-timezone }
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"Timestamps relative to each other:"
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{ $subsections "relative-timestamps" }
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"Operations on units of time:"
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{ $subsections
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"years"
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"months"
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"days"
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}
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"Meta-data about the calendar:"
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{ $subsections "calendar-facts" }
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;
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ARTICLE: "timestamp-arithmetic" "Timestamp arithmetic"
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"Adding timestamps and durations, or durations and durations:"
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{ $subsections time+ }
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"Subtracting:"
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{ $subsections time- }
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"Element-wise multiplication:"
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{ $subsections time* } ;
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ARTICLE: "using-durations" "Using durations"
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"Creating a duration object:"
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{ $subsections
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years
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months
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weeks
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days
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hours
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minutes
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seconds
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milliseconds
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microseconds
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nanoseconds
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instant
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}
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"Converting a duration to a number:"
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{ $subsections
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duration>years
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duration>months
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duration>days
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duration>hours
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duration>minutes
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duration>seconds
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duration>milliseconds
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duration>microseconds
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duration>nanoseconds
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} ;
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ARTICLE: "relative-timestamps" "Relative timestamps"
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"In the future:"
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{ $subsections hence }
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"In the past:"
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{ $subsections ago }
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"Invert a duration:"
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{ $subsections before }
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"Days of the week relative to " { $link now } ":"
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{ $subsections
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sunday
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monday
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tuesday
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wednesday
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thursday
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friday
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saturday
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}
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"New timestamps relative to calendar events:"
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{ $subsections
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beginning-of-year
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beginning-of-month
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beginning-of-week
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midnight
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noon
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} ;
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ARTICLE: "days" "Day operations"
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"Naming days:"
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{ $subsections
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day-abbreviation2
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day-abbreviations2
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day-abbreviation3
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day-abbreviations3
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day-name
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day-names
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}
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"Calculating a Julian day number:"
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{ $subsections julian-day-number }
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"Calculate a timestamp:"
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{ $subsections julian-day-number>date } ;
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ARTICLE: "calendar-facts" "Calendar facts"
|
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"Calendar facts:"
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{ $subsections
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average-month
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months-per-year
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days-per-year
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hours-per-year
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minutes-per-year
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seconds-per-year
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days-in-month
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day-of-year
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day-of-week
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} ;
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ARTICLE: "years" "Year operations"
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|
"Leap year predicate:"
|
|
{ $subsections leap-year? }
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|
"Find the number of days in a year:"
|
|
{ $subsections days-in-year } ;
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ARTICLE: "months" "Month operations"
|
|
"Naming months:"
|
|
{ $subsections
|
|
month-name
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month-names
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month-abbreviation
|
|
month-abbreviations
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|
} ;
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ABOUT: "calendar"
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