| 1 | |
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| 2 | :- protocol(datep). |
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| 3 | |
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| 4 | |
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| 5 | :- info([ |
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| 6 | version is 1.0, |
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| 7 | author is 'Paulo Moura', |
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| 8 | date is 2000/7/24, |
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| 9 | comment is 'Date protocol.']). |
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| 10 | |
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| 11 | |
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| 12 | :- public(today/3). |
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| 13 | |
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| 14 | :- mode(today(-integer, -integer, -integer), one). |
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| 15 | |
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| 16 | :- info(now/3, [ |
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| 17 | comment is 'Returns current date.', |
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| 18 | argnames is ['Year', 'Month', 'Day']]). |
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| 19 | |
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| 20 | |
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| 21 | :- public(leap_year/1). |
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| 22 | |
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| 23 | :- mode(leap_year(+integer), zero_or_one). |
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| 24 | |
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| 25 | :- info(empty/1, |
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| 26 | [comment is 'True if the argument is a leap year.', |
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| 27 | argnames is ['Year']]). |
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| 28 | |
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| 29 | |
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| 30 | :- public(name_of_day/3). |
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| 31 | |
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| 32 | :- mode(name_of_day(?integer, ?atom, ?atom), zero_or_more). |
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| 33 | |
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| 34 | :- info(valid/3, [ |
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| 35 | comment is 'Name and short name of day.', |
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| 36 | argnames is ['Index', 'Name', 'Short']]). |
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| 37 | |
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| 38 | |
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| 39 | :- public(name_of_month/3). |
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| 40 | |
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| 41 | :- mode(name_of_month(?integer, ?atom, ?atom), zero_or_more). |
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| 42 | |
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| 43 | :- info(valid/3, [ |
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| 44 | comment is 'Name and short name of month.', |
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| 45 | argnames is ['Index', 'Name', 'Short']]). |
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| 46 | |
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| 47 | |
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| 48 | :- public(days_in_month/3). |
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| 49 | |
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| 50 | :- mode(days_in_month(?integer, +integer, ?integer), zero_or_more). |
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| 51 | |
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| 52 | :- info(valid/3, [ |
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| 53 | comment is 'Number of days in a month.', |
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| 54 | argnames is ['Month', 'Year', 'Days']]). |
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| 55 | |
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| 56 | |
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| 57 | :- public(valid/3). |
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| 58 | |
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| 59 | :- mode(valid(@integer, @integer, @integer), zero_or_one). |
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| 60 | |
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| 61 | :- info(valid/3, [ |
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| 62 | comment is 'True if the arguments represent a valid date.', |
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| 63 | argnames is ['Year', 'Month', 'Day']]). |
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| 64 | |
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| 65 | |
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| 66 | :- end_protocol. |
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