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Versions: 6
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Contents
module Dentaku
class DateArithmetic
def initialize(date)
@base = date
end
def add(duration)
case duration
when Numeric
@base + duration
when Dentaku::AST::Duration::Value
case duration.unit
when :year
Time.local(@base.year + duration.value, @base.month, @base.day).to_datetime
when :month
@base >> duration.value
when :day
@base + duration.value
end
else
raise Dentaku::ArgumentError.for(:incompatible_type, value: duration, for: Numeric),
"'#{duration || duration.class}' is not coercible for date arithmetic"
end
end
def sub(duration)
case duration
when DateTime, Numeric
@base - duration
when Dentaku::AST::Duration::Value
case duration.unit
when :year
Time.local(@base.year - duration.value, @base.month, @base.day).to_datetime
when :month
@base << duration.value
when :day
@base - duration.value
end
else
raise Dentaku::ArgumentError.for(:incompatible_type, value: duration, for: Numeric),
"'#{duration || duration.class}' is not coercible for date arithmetic"
end
end
end
end
Version data entries
6 entries across 6 versions & 2 rubygems