I had to make a change to the return values. They are now an array (to
maintain order), with the first element being a string looking like
"2006-10", as the code works for multiple dates, the second element is
an array with the period covered.
Lots of special case code for handling year boundaries. I'm sure this
can be tightened up, I'd be interested to hear views as to how...
require 'date'
def coverage rg
from = Date.parse(rg[0])
to = Date.parse(rg[1])
cover =
# build a list of all month indexes we need to iterate over
if from.year==to.year
# trivial case, both dates fall within the same year
month_range = (from.month..to.month )
else
# complex case - dates in different years
# first year - form month to december
month_range = (from.month..12).to_a
# more than one year covered?
(to.year-from.year-1).times do |year|
# jan to dec
month_range += (1..12).to_a
end
# last year - jan to to.month
month_range += (1..to.month).to_a
end
y = from.year
month_range.each do |m|
if from < Date.new(y,m,1)
first_day = 1
else
first_day = from.day
end
# passing -1 as the day gets the last day of the month
end_of_month = Date.new(y,m,-1)
if to > end_of_month
last_day = end_of_month.day
else
last_day = to.day
end
cover << ["#{y}-#{m}",[first_day, last_day]]
# next year?
y +=1 if m==12
end
cover
end
p coverage(["2006-10-12","2008-02-12"])
Cheers,
Max
···
On 10/19/06, Josselin <josselin@wanadoo.fr> wrote:
I need help from a ruby master... it's too hard with my present
understanding, any starting key will be apprciated ....
from a period range [start_date, end_date] in ayear , I need to
produce a list of special days like the following :
["2006-10-12","2006-11-08"] => { 10 : [ 12 , 31], 11 : [ 1, 8] }
or
["2006-10-12","2006-12-08"] => { 10 : [ 12 , 31], 11 : [ 1, 30] , 12
: [ 1, 12] }
which means, for each month in the range
the month number : [ period covered in the month] ,
where 'period covered in the month' is
[ 1st day of the period or 1st day of the month , last day of the
period or last day of the month ]
coudl I get any clue ?
thanks a lot
joss