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module Chronic
class Ordinal < Tag #:nodoc:
def self.scan(tokens)
# for each token
tokens.each_index do |i|
if t = self.scan_for_ordinals(tokens[i]) then tokens[i].tag(t) end
if t = self.scan_for_days(tokens[i]) then tokens[i].tag(t) end
end
tokens
end
def self.scan_for_ordinals(token)
if token.word =~ /^(\d*)(st|nd|rd|th)$/
return Ordinal.new($1.to_i)
end
return nil
end
def self.scan_for_days(token)
if token.word =~ /^(\d*)(st|nd|rd|th)$/
unless $1.to_i > 31
return OrdinalDay.new(token.word.to_i)
end
end
return nil
end
def to_s
'ordinal'
end
end
class OrdinalDay < Ordinal #:nodoc:
def to_s
super << '-day-' << @type.to_s
end
end
end
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