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[DOC] Enhanced intro for Date #72

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merged 8 commits into from
Aug 15, 2022
Merged

[DOC] Enhanced intro for Date #72

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acd917e
Enhanced intro for Date
BurdetteLamar Aug 7, 2022
6406e20
Enhanced RDoc for Date
BurdetteLamar Aug 8, 2022
b7e2e53
Enhanced RDoc for Date
BurdetteLamar Aug 8, 2022
42615a0
Enhanced RDoc for Date
BurdetteLamar Aug 13, 2022
1cfb1ff
Update ext/date/date_core.c
BurdetteLamar Aug 14, 2022
9968aad
Enhanced RDoc for Date
BurdetteLamar Aug 14, 2022
12becd5
Enhanced RDoc for Date
BurdetteLamar Aug 14, 2022
cb6c351
Enhanced RDoc for Date
BurdetteLamar Aug 14, 2022
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184 changes: 51 additions & 133 deletions ext/date/date_core.c
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Original file line number Diff line number Diff line change
Expand Up @@ -4505,6 +4505,9 @@ date_s__parse_internal(int argc, VALUE *argv, VALUE klass)
* <b>Note</b>:
* This method recognizes many forms in +string+,
* but it is not a validator.
* For formats, see
* {"Specialized Format Strings" in Formats for Dates and Times}[https://docs.ruby-lang.org/en/master/strftime_formatting_rdoc.html#label-Specialized+Format+Strings]
*
* If +string+ does not specify a valid date,
* the result is unpredictable;
* consider using Date._strptime instead.
Expand Down Expand Up @@ -4537,6 +4540,8 @@ date_s__parse(int argc, VALUE *argv, VALUE klass)
* <b>Note</b>:
* This method recognizes many forms in +string+,
* but it is not a validator.
* For formats, see
* {"Specialized Format Strings" in Formats for Dates and Times}[https://docs.ruby-lang.org/en/master/strftime_formatting_rdoc.html#label-Specialized+Format+Strings]
* If +string+ does not specify a valid date,
* the result is unpredictable;
* consider using Date._strptime instead.
Expand Down Expand Up @@ -4671,7 +4676,7 @@ date_s_iso8601(int argc, VALUE *argv, VALUE klass)
* Date._rfc3339(string, limit: 128) -> hash
*
* Returns a hash of values parsed from +string+, which should be a valid
* {RFC 3339 format}[https://datatracker.ietf.org/doc/html/rfc3339]:
* {RFC 3339 format}[https://docs.ruby-lang.org/en/master/strftime_formatting_rdoc.html#label-RFC+3339+Format]:
*
* d = Date.new(2001, 2, 3)
* s = d.rfc3339 # => "2001-02-03T00:00:00+00:00"
Expand Down Expand Up @@ -4699,7 +4704,7 @@ date_s__rfc3339(int argc, VALUE *argv, VALUE klass)
*
* Returns a new \Date object with values parsed from +string+,
* which should be a valid
* {RFC 3339 format}[https://datatracker.ietf.org/doc/html/rfc3339]:
* {RFC 3339 format}[https://docs.ruby-lang.org/en/master/strftime_formatting_rdoc.html#label-RFC+3339+Format]:
*
* d = Date.new(2001, 2, 3)
* s = d.rfc3339 # => "2001-02-03T00:00:00+00:00"
Expand Down Expand Up @@ -4811,7 +4816,7 @@ date_s_xmlschema(int argc, VALUE *argv, VALUE klass)
* Date._rfc2822(string, limit: 128) -> hash
*
* Returns a hash of values parsed from +string+, which should be a valid
* {RFC 2822 date format}[https://datatracker.ietf.org/doc/html/rfc2822]:
* {RFC 2822 date format}[https://docs.ruby-lang.org/en/master/strftime_formatting_rdoc.html#label-RFC+2822+Format]:
*
* d = Date.new(2001, 2, 3)
* s = d.rfc2822 # => "Sat, 3 Feb 2001 00:00:00 +0000"
Expand Down Expand Up @@ -4841,7 +4846,7 @@ date_s__rfc2822(int argc, VALUE *argv, VALUE klass)
*
* Returns a new \Date object with values parsed from +string+,
* which should be a valid
* {RFC 2822 date format}[https://datatracker.ietf.org/doc/html/rfc2822]:
* {RFC 2822 date format}[https://docs.ruby-lang.org/en/master/strftime_formatting_rdoc.html#label-RFC+2822+Format]:
*
* d = Date.new(2001, 2, 3)
* s = d.rfc2822 # => "Sat, 3 Feb 2001 00:00:00 +0000"
Expand Down Expand Up @@ -4885,7 +4890,7 @@ date_s_rfc2822(int argc, VALUE *argv, VALUE klass)
* Date._httpdate(string, limit: 128) -> hash
*
* Returns a hash of values parsed from +string+, which should be a valid
* HTTP date format:
* {HTTP date format}[https://docs.ruby-lang.org/en/master/strftime_formatting_rdoc.html#label-HTTP+Format]:
*
* d = Date.new(2001, 2, 3)
* s = d.httpdate # => "Sat, 03 Feb 2001 00:00:00 GMT"
Expand All @@ -4911,7 +4916,7 @@ date_s__httpdate(int argc, VALUE *argv, VALUE klass)
*
* Returns a new \Date object with values parsed from +string+,
* which should be a valid
* {RFC 2616 date format}[https://datatracker.ietf.org/doc/html/rfc2616]:
* {HTTP date format}[https://docs.ruby-lang.org/en/master/strftime_formatting_rdoc.html#label-HTTP+Format]:
*
* d = Date.new(2001, 2, 3)
s = d.httpdate # => "Sat, 03 Feb 2001 00:00:00 GMT"
Expand Down Expand Up @@ -4953,7 +4958,7 @@ date_s_httpdate(int argc, VALUE *argv, VALUE klass)
* Date._jisx0301(string, limit: 128) -> hash
*
* Returns a hash of values parsed from +string+, which should be a valid
* JIS X 0301 date format:
* {JIS X 0301 date format}[https://docs.ruby-lang.org/en/master/strftime_formatting_rdoc.html#label-JIS+X+0301+Format]:
*
* d = Date.new(2001, 2, 3)
* s = d.jisx0301 # => "H13.02.03"
Expand All @@ -4979,7 +4984,7 @@ date_s__jisx0301(int argc, VALUE *argv, VALUE klass)
* Date.jisx0301(string = '-4712-01-01', start = Date::ITALY, limit: 128) -> date
*
* Returns a new \Date object with values parsed from +string+,
* which should be a valid JIS X 0301 format:
* which should be a valid {JIS X 0301 format}[https://docs.ruby-lang.org/en/master/strftime_formatting_rdoc.html#label-JIS+X+0301+Format]:
*
* d = Date.new(2001, 2, 3)
* s = d.jisx0301 # => "H13.02.03"
Expand Down Expand Up @@ -9378,151 +9383,65 @@ Init_date_core(void)
negative_inf = -INFINITY;

/*
* date and datetime class - Tadayoshi Funaba 1998-2011
*
* 'date' provides two classes: Date and DateTime.
*
* == Terms and Definitions
*
* Some terms and definitions are based on ISO 8601 and JIS X 0301.
*
* === Calendar Date
*
* The calendar date is a particular day of a calendar year,
* identified by its ordinal number within a calendar month within
* that year.
* \Class \Date provides methods for storing and manipulating
* calendar dates.
*
* In those classes, this is so-called "civil".
* Consider using
* {class Time}[https://docs.ruby-lang.org/en/master/Time.html]
* instead of class \Date if:
*
* === Ordinal Date
* - You need both dates and times; \Date handles only dates.
* - You need only Gregorian dates (and not Julian dates);
* see {Julian and Gregorian Calendars}[rdoc-ref:calendars.rdoc].
*
* The ordinal date is a particular day of a calendar year identified
* by its ordinal number within the year.
* A \Date object, once created, is immutable, and cannot be modified.
*
* In those classes, this is so-called "ordinal".
* == Creating a \Date
*
* === Week Date
* You can create a date for the current date, using Date.today:
*
* The week date is a date identified by calendar week and day numbers.
* Date.today # => #<Date: 1999-12-31>
*
* The calendar week is a seven day period within a calendar year,
* starting on a Monday and identified by its ordinal number within
* the year; the first calendar week of the year is the one that
* includes the first Thursday of that year. In the Gregorian
* calendar, this is equivalent to the week which includes January 4.
* You can create a specific date from various combinations of arguments:
*
* In those classes, this is so-called "commercial".
* - Date.new takes integer year, month, and day-of-month:
*
* === Julian Day Number
* Date.new(1999, 12, 31) # => #<Date: 1999-12-31>
*
* The Julian day number is in elapsed days since noon (Greenwich Mean
* Time) on January 1, 4713 BCE (in the Julian calendar).
* - Date.ordinal takes integer year and day-of-year:
*
* In this document, the astronomical Julian day number is the same as
* the original Julian day number. And the chronological Julian day
* number is a variation of the Julian day number. Its days begin at
* midnight on local time.
* Date.ordinal(1999, 365) # => #<Date: 1999-12-31>
*
* In this document, when the term "Julian day number" simply appears,
* it just refers to "chronological Julian day number", not the
* original.
* - Date.jd takes integer Julian day:
*
* In those classes, those are so-called "ajd" and "jd".
* Date.jd(2451544) # => #<Date: 1999-12-31>
*
* === Modified Julian Day Number
* - Date.commercial takes integer commercial data (year, week, day-of-week):
*
* The modified Julian day number is in elapsed days since midnight
* (Coordinated Universal Time) on November 17, 1858 CE (in the
* Gregorian calendar).
* Date.commercial(1999, 52, 5) # => #<Date: 1999-12-31>
*
* In this document, the astronomical modified Julian day number is
* the same as the original modified Julian day number. And the
* chronological modified Julian day number is a variation of the
* modified Julian day number. Its days begin at midnight on local
* time.
* - Date.parse takes a string, which it parses heuristically:
*
* In this document, when the term "modified Julian day number" simply
* appears, it just refers to "chronological modified Julian day
* number", not the original.
* Date.parse('1999-12-31') # => #<Date: 1999-12-31>
* Date.parse('31-12-1999') # => #<Date: 1999-12-31>
* Date.parse('1999-365') # => #<Date: 1999-12-31>
* Date.parse('1999-W52-5') # => #<Date: 1999-12-31>
*
* In those classes, those are so-called "amjd" and "mjd".
*
* == Date
*
* A subclass of Object that includes the Comparable module and
* easily handles date.
*
* A Date object is created with Date::new, Date::jd, Date::ordinal,
* Date::commercial, Date::parse, Date::strptime, Date::today,
* Time#to_date, etc.
*
* require 'date'
* - Date.strptime takes a date string and a format string,
* then parses the date string according to the format string:
*
* Date.new(2001,2,3)
* #=> #<Date: 2001-02-03 ...>
* Date.jd(2451944)
* #=> #<Date: 2001-02-03 ...>
* Date.ordinal(2001,34)
* #=> #<Date: 2001-02-03 ...>
* Date.commercial(2001,5,6)
* #=> #<Date: 2001-02-03 ...>
* Date.parse('2001-02-03')
* #=> #<Date: 2001-02-03 ...>
* Date.strptime('03-02-2001', '%d-%m-%Y')
* #=> #<Date: 2001-02-03 ...>
* Time.new(2001,2,3).to_date
* #=> #<Date: 2001-02-03 ...>
* Date.strptime('1999-12-31', '%Y-%m-%d') # => #<Date: 1999-12-31>
* Date.strptime('31-12-1999', '%d-%m-%Y') # => #<Date: 1999-12-31>
* Date.strptime('1999-365', '%Y-%j') # => #<Date: 1999-12-31>
* Date.strptime('1999-W52-5', '%G-W%V-%u') # => #<Date: 1999-12-31>
* Date.strptime('1999 52 5', '%Y %U %w') # => #<Date: 1999-12-31>
* Date.strptime('1999 52 5', '%Y %W %u') # => #<Date: 1999-12-31>
* Date.strptime('fri31dec99', '%a%d%b%y') # => #<Date: 1999-12-31>
*
* All date objects are immutable; hence cannot modify themselves.
* See also the specialized methods in
* {"Specialized Format Strings" in Formats for Dates and Times}[https://docs.ruby-lang.org/en/master/strftime_formatting_rdoc.html#label-Specialized+Format+Strings]
*
* The concept of a date object can be represented as a tuple
* of the day count, the offset and the day of calendar reform.
*
* The day count denotes the absolute position of a temporal
* dimension. The offset is relative adjustment, which determines
* decoded local time with the day count. The day of calendar
* reform denotes the start day of the new style. The old style
* of the West is the Julian calendar which was adopted by
* Caesar. The new style is the Gregorian calendar, which is the
* current civil calendar of many countries.
*
* The day count is virtually the astronomical Julian day number.
* The offset in this class is usually zero, and cannot be
* specified directly.
*
* A Date object can be created with an optional argument,
* the day of calendar reform as a Julian day number, which
* should be 2298874 to 2426355 or negative/positive infinity.
* The default value is +Date::ITALY+ (2299161=1582-10-15).
* See also sample/cal.rb.
*
* $ ruby sample/cal.rb -c it 10 1582
* October 1582
* S M Tu W Th F S
* 1 2 3 4 15 16
* 17 18 19 20 21 22 23
* 24 25 26 27 28 29 30
* 31
*
* $ ruby sample/cal.rb -c gb 9 1752
* September 1752
* S M Tu W Th F S
* 1 2 14 15 16
* 17 18 19 20 21 22 23
* 24 25 26 27 28 29 30
*
* A Date object has various methods. See each reference.
*
* d = Date.parse('3rd Feb 2001')
* #=> #<Date: 2001-02-03 ...>
* d.year #=> 2001
* d.mon #=> 2
* d.mday #=> 3
* d.wday #=> 6
* d += 1 #=> #<Date: 2001-02-04 ...>
* d.strftime('%a %d %b %Y') #=> "Sun 04 Feb 2001"
*
* === Argument +limit+
* == Argument +limit+
*
* Certain singleton methods in \Date that parse string arguments
* also take optional keyword argument +limit+,
Expand All @@ -9536,7 +9455,6 @@ Init_date_core(void)
* - Other non-numeric: raises TypeError.
*
*/

cDate = rb_define_class("Date", rb_cObject);

/* Exception for invalid date/time */
Expand Down