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Contents
module Krikri::Util
module ExtendedDateParser
module_function
def parse(date_str)
date = Date.edtf(date_str)
date ||= partial_edtf(date_str)
date ||= decade_hyphen(date_str)
date ||= month_year(date_str)
date ||= decade_s(date_str)
date ||= hyphenated_partial_range(date_str)
date ||= begin
Date.parse(date_str)
rescue ArgumentError
nil
end
end
def range_match(str)
regexp = %r{
([\d\-\.xu\?\~]*\d{4}[\d\-\.xu\?\~]*)
\s*[-\.]+\s*
([\d\-\.xu\?\~]*\d{4}[\d\.\-xu\?\~]*)
}x
regexp.match(str) do |m|
[m[1], m[2]]
end
end
##
# e.g. 01-2045
def month_year(str)
/(\d{2})-(\d{4})/.match(str) do |m|
Date.edtf("#{m[2]}-#{m[1]}")
end
end
##
# e.g. 1990-92
def hyphenated_partial_range(str)
/^(\d{2})(\d{2})-(\d{2})$/.match(str) do |m|
Date.edtf("#{m[1]}#{m[2]}/#{m[1]}#{m[3]}")
end
end
##
# e.g. 1970-08-01/02 or 1970-12/10
def partial_edtf(str)
/^(\d{4}(-\d{2})*)-(\d{2})\/(\d{2})$/.match(str) do |m|
Date.edtf("#{m[1]}-#{m[3]}/#{m[1]}-#{m[4]}")
end
end
##
# e.g. 1990s
def decade_s(str)
/^(\d{3})0s$/.match(str) do |m|
Date.edtf("#{m[1]}x")
end
end
##
# e.g. 199-
def decade_hyphen(str)
/^(\d{3})-$/.match(str) do |m|
Date.edtf("#{m[1]}x")
end
end
end
end
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