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date_core.c: expand docs for Date shifting 

* ext/date/date_core.c: [DOC] expand docs for Date shifting

  * add examples for Date#>> and Date#<< that clarify some edge cases
  * add examples for Date#next_year and Date#prev_year
  * add cross references to Date#>> and Date#<<

  [ruby-core:79584] [Bug #13225]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57737 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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stomar 2017-02-27 18:26:22 +00:00
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48
ext/date/date_core.c
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@ -5969,9 +5969,20 @@ d_lite_next(VALUE self)
* The argument +n+ should be a numeric value.
*
* Date.new(2001,2,3) >> 1 #=> #<Date: 2001-03-03 ...>
* Date.new(2001,1,30) >> 1 #=> #<Date: 2001-02-28 ...>
* Date.new(2001,1,31) >> 1 #=> #<Date: 2001-02-28 ...>
* Date.new(2001,2,3) >> -2 #=> #<Date: 2000-12-03 ...>
*
* When the same day does not exist for the corresponding month,
* the last day of the month is used instead:
*
* Date.new(2001,1,28) >> 1 #=> #<Date: 2001-02-28 ...>
* Date.new(2001,1,31) >> 1 #=> #<Date: 2001-02-28 ...>
*
* This also results in the following, possibly unexpected, behavior:
*
* Date.new(2001,1,31) >> 2 #=> #<Date: 2001-03-31 ...>
* Date.new(2001,1,31) >> 1 >> 1 #=> #<Date: 2001-03-28 ...>
*
* Date.new(2001,1,31) >> 1 >> -1 #=> #<Date: 2001-01-28 ...>
*/
static VALUE
d_lite_rshift(VALUE self, VALUE other)
@ -6020,9 +6031,20 @@ d_lite_rshift(VALUE self, VALUE other)
* The argument +n+ should be a numeric value.
*
* Date.new(2001,2,3) << 1 #=> #<Date: 2001-01-03 ...>
* Date.new(2001,1,30) << 11 #=> #<Date: 2000-02-29 ...>
* Date.new(2001,1,31) << 11 #=> #<Date: 2000-02-29 ...>
* Date.new(2001,2,3) << -1 #=> #<Date: 2001-03-03 ...>
* Date.new(2001,2,3) << -2 #=> #<Date: 2001-04-03 ...>
*
* When the same day does not exist for the corresponding month,
* the last day of the month is used instead:
*
* Date.new(2001,3,28) << 1 #=> #<Date: 2001-02-28 ...>
* Date.new(2001,3,31) << 1 #=> #<Date: 2001-02-28 ...>
*
* This also results in the following, possibly unexpected, behavior:
*
* Date.new(2001,3,31) << 2 #=> #<Date: 2001-01-31 ...>
* Date.new(2001,3,31) << 1 << 1 #=> #<Date: 2001-01-28 ...>
*
* Date.new(2001,3,31) << 1 << -1 #=> #<Date: 2001-03-28 ...>
*/
static VALUE
d_lite_lshift(VALUE self, VALUE other)
@ -6036,6 +6058,8 @@ d_lite_lshift(VALUE self, VALUE other)
* d.next_month([n=1]) -> date
*
* This method is equivalent to d >> n.
*
* See Date#>> for examples.
*/
static VALUE
d_lite_next_month(int argc, VALUE *argv, VALUE self)
@ -6053,6 +6077,8 @@ d_lite_next_month(int argc, VALUE *argv, VALUE self)
* d.prev_month([n=1]) -> date
*
* This method is equivalent to d << n.
*
* See Date#<< for examples.
*/
static VALUE
d_lite_prev_month(int argc, VALUE *argv, VALUE self)
@ -6070,6 +6096,12 @@ d_lite_prev_month(int argc, VALUE *argv, VALUE self)
* d.next_year([n=1]) -> date
*
* This method is equivalent to d >> (n * 12).
*
* Date.new(2001,2,3).next_year #=> #<Date: 2002-02-03 ...>
* Date.new(2008,2,29).next_year #=> #<Date: 2009-02-28 ...>
* Date.new(2008,2,29).next_year(4) #=> #<Date: 2012-02-29 ...>
*
* See also Date#>>.
*/
static VALUE
d_lite_next_year(int argc, VALUE *argv, VALUE self)
@ -6087,6 +6119,12 @@ d_lite_next_year(int argc, VALUE *argv, VALUE self)
* d.prev_year([n=1]) -> date
*
* This method is equivalent to d << (n * 12).
*
* Date.new(2001,2,3).prev_year #=> #<Date: 2000-02-03 ...>
* Date.new(2008,2,29).prev_year #=> #<Date: 2007-02-28 ...>
* Date.new(2008,2,29).prev_year(4) #=> #<Date: 2004-02-29 ...>
*
* See also Date#<<.
*/
static VALUE
d_lite_prev_year(int argc, VALUE *argv, VALUE self)