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module Chronic
class Ordinal < Tag
# Scan an Array of Token objects and apply any necessary Ordinal
# tags to each token.
#
# tokens - An Array of tokens to scan.
# options - The Hash of options specified in Chronic::parse.
#
# Returns an Array of tokens.
def self.scan(tokens, options)
tokens.each_index do |i|
if tokens[i].word =~ /^(\d+)(st|nd|rd|th|\.)$/
ordinal = $1.to_i
tokens[i].tag(Ordinal.new(ordinal))
tokens[i].tag(OrdinalDay.new(ordinal)) if Chronic::Date::could_be_day?(ordinal)
tokens[i].tag(OrdinalMonth.new(ordinal)) if Chronic::Date::could_be_month?(ordinal)
if Chronic::Date::could_be_year?(ordinal)
year = Chronic::Date::make_year(ordinal, options[:ambiguous_year_future_bias])
tokens[i].tag(OrdinalYear.new(year.to_i))
end
end
end
end
def to_s
'ordinal'
end
end
class OrdinalDay < Ordinal #:nodoc:
def to_s
super << '-day-' << @type.to_s
end
end
class OrdinalMonth < Ordinal #:nodoc:
def to_s
super << '-month-' << @type.to_s
end
end
class OrdinalYear < Ordinal #:nodoc:
def to_s
super << '-year-' << @type.to_s
end
end
end
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