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module Chronic
class Scalar < Tag
DAY_PORTIONS = %w( am pm morning afternoon evening night )
# Scan an Array of {Token}s and apply any necessary Scalar tags to
# each token
#
# @param [Array<Token>] tokens Array of tokens to scan
# @param [Hash] options Options specified in {Chronic.parse}
# @return [Array] list of tokens
def self.scan(tokens, options)
tokens.each_index do |i|
if t = scan_for_scalars(tokens[i], tokens[i + 1]) then tokens[i].tag(t) end
if t = scan_for_days(tokens[i], tokens[i + 1]) then tokens[i].tag(t) end
if t = scan_for_months(tokens[i], tokens[i + 1]) then tokens[i].tag(t) end
if t = scan_for_years(tokens[i], tokens[i + 1], options) then tokens[i].tag(t) end
end
end
# @param [Token] token
# @param [Token] post_token
# @return [Scalar, nil]
def self.scan_for_scalars(token, post_token)
if token.word =~ /^\d*$/
unless post_token && DAY_PORTIONS.include?(post_token.word)
return Scalar.new(token.word.to_i)
end
end
end
# @param [Token] token
# @param [Token] post_token
# @return [ScalarDay, nil]
def self.scan_for_days(token, post_token)
if token.word =~ /^\d\d?$/
toi = token.word.to_i
unless toi > 31 || toi < 1 || (post_token && DAY_PORTIONS.include?(post_token.word))
return ScalarDay.new(toi)
end
end
end
# @param [Token] token
# @param [Token] post_token
# @return [ScalarMonth, nil]
def self.scan_for_months(token, post_token)
if token.word =~ /^\d\d?$/
toi = token.word.to_i
unless toi > 12 || toi < 1 || (post_token && DAY_PORTIONS.include?(post_token.word))
return ScalarMonth.new(toi)
end
end
end
# @param [Token] token
# @param [Token] post_token
# @param [Hash] options Options specified in {Chronic.parse}
# @return [ScalarYear, nil]
def self.scan_for_years(token, post_token, options)
if token.word =~ /^([1-9]\d)?\d\d?$/
unless post_token && DAY_PORTIONS.include?(post_token.word)
year = make_year(token.word.to_i, options[:ambiguous_year_future_bias])
return ScalarYear.new(year.to_i)
end
end
end
# Build a year from a 2 digit suffix
#
# @example
# make_year(96, 50) #=> 1996
# make_year(79, 20) #=> 2079
# make_year(00, 50) #=> 2000
#
# @param [Integer] year The two digit year to build from
# @param [Integer] bias The amount of future years to bias
# @return [Integer] The 4 digit year
def self.make_year(year, bias)
return year if year.to_s.size > 2
start_year = Chronic.time_class.now.year - bias
century = (start_year / 100) * 100
full_year = century + year
full_year += 100 if full_year < start_year
full_year
end
def to_s
'scalar'
end
end
class ScalarDay < Scalar #:nodoc:
def to_s
super << '-day-' << @type.to_s
end
end
class ScalarMonth < Scalar #:nodoc:
def to_s
super << '-month-' << @type.to_s
end
end
class ScalarYear < Scalar #:nodoc:
def to_s
super << '-year-' << @type.to_s
end
end
end
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