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require 'chronic/handlers'
module Chronic
class Parser
include Handlers
# Hash of default configuration options.
DEFAULT_OPTIONS = {
:context => :future,
:now => nil,
:hours24 => nil,
:guess => true,
:ambiguous_time_range => 6,
:endian_precedence => [:middle, :little],
:ambiguous_year_future_bias => 50
}
attr_accessor :now
attr_reader :options
# options - An optional Hash of configuration options:
# :context - If your string represents a birthday, you can set
# this value to :past and if an ambiguous string is
# given, it will assume it is in the past.
# :now - Time, all computations will be based off of time
# instead of Time.now.
# :hours24 - Time will be parsed as it would be 24 hour clock.
# :guess - By default the parser will guess a single point in time
# for the given date or time. If you'd rather have the
# entire time span returned, set this to false
# and a Chronic::Span will be returned. Setting :guess to :end
# will return last time from Span, to :middle for middle (same as just true)
# and :begin for first time from span.
# :ambiguous_time_range - If an Integer is given, ambiguous times
# (like 5:00) will be assumed to be within the range of
# that time in the AM to that time in the PM. For
# example, if you set it to `7`, then the parser will
# look for the time between 7am and 7pm. In the case of
# 5:00, it would assume that means 5:00pm. If `:none`
# is given, no assumption will be made, and the first
# matching instance of that time will be used.
# :endian_precedence - By default, Chronic will parse "03/04/2011"
# as the fourth day of the third month. Alternatively you
# can tell Chronic to parse this as the third day of the
# fourth month by setting this to [:little, :middle].
# :ambiguous_year_future_bias - When parsing two digit years
# (ie 79) unlike Rubys Time class, Chronic will attempt
# to assume the full year using this figure. Chronic will
# look x amount of years into the future and past. If the
# two digit year is `now + x years` it's assumed to be the
# future, `now - x years` is assumed to be the past.
def initialize(options = {})
@options = DEFAULT_OPTIONS.merge(options)
@now = options.delete(:now) || Chronic.time_class.now
end
# Parse "text" with the given options
# Returns either a Time or Chronic::Span, depending on the value of options[:guess]
def parse(text)
tokens = tokenize(text, options)
span = tokens_to_span(tokens, options.merge(:text => text))
puts "+#{'-' * 51}\n| #{tokens}\n+#{'-' * 51}" if Chronic.debug
guess(span, options[:guess]) if span
end
# Clean up the specified text ready for parsing.
#
# Clean up the string by stripping unwanted characters, converting
# idioms to their canonical form, converting number words to numbers
# (three => 3), and converting ordinal words to numeric
# ordinals (third => 3rd)
#
# text - The String text to normalize.
#
# Examples:
#
# Chronic.pre_normalize('first day in May')
# #=> "1st day in may"
#
# Chronic.pre_normalize('tomorrow after noon')
# #=> "next day future 12:00"
#
# Chronic.pre_normalize('one hundred and thirty six days from now')
# #=> "136 days future this second"
#
# Returns a new String ready for Chronic to parse.
def pre_normalize(text)
text = text.to_s.downcase
text.gsub!(/\b(\d{2})\.(\d{2})\.(\d{4})\b/, '\3 / \2 / \1')
text.gsub!(/\b([ap])\.m\.?/, '\1m')
text.gsub!(/(\s+|:\d{2}|:\d{2}\.\d{3})\-(\d{2}:?\d{2})\b/, '\1tzminus\2')
text.gsub!(/\./, ':')
text.gsub!(/([ap]):m:?/, '\1m')
text.gsub!(/['"]/, '')
text.gsub!(/,/, ' ')
text.gsub!(/^second /, '2nd ')
text.gsub!(/\bsecond (of|day|month|hour|minute|second)\b/, '2nd \1')
text = Numerizer.numerize(text)
text.gsub!(/([\/\-\,\@])/) { ' ' + $1 + ' ' }
text.gsub!(/(?:^|\s)0(\d+:\d+\s*pm?\b)/, ' \1')
text.gsub!(/\btoday\b/, 'this day')
text.gsub!(/\btomm?orr?ow\b/, 'next day')
text.gsub!(/\byesterday\b/, 'last day')
text.gsub!(/\bnoon\b/, '12:00pm')
text.gsub!(/\bmidnight\b/, '24:00')
text.gsub!(/\bnow\b/, 'this second')
text.gsub!('quarter', '15')
text.gsub!('half', '30')
text.gsub!(/(\d{1,2}) (to|till|prior to|before)\b/, '\1 minutes past')
text.gsub!(/(\d{1,2}) (after|past)\b/, '\1 minutes future')
text.gsub!(/\b(?:ago|before(?: now)?)\b/, 'past')
text.gsub!(/\bthis (?:last|past)\b/, 'last')
text.gsub!(/\b(?:in|during) the (morning)\b/, '\1')
text.gsub!(/\b(?:in the|during the|at) (afternoon|evening|night)\b/, '\1')
text.gsub!(/\btonight\b/, 'this night')
text.gsub!(/\b\d+:?\d*[ap]\b/,'\0m')
text.gsub!(/\b(\d{2})(\d{2})(am|pm)\b/, '\1:\2\3')
text.gsub!(/(\d)([ap]m|oclock)\b/, '\1 \2')
text.gsub!(/\b(hence|after|from)\b/, 'future')
text.gsub!(/^\s?an? /i, '1 ')
text.gsub!(/\b(\d{4}):(\d{2}):(\d{2})\b/, '\1 / \2 / \3') # DTOriginal
text.gsub!(/\b0(\d+):(\d{2}):(\d{2}) ([ap]m)\b/, '\1:\2:\3 \4')
text
end
# Guess a specific time within the given span.
#
# span - The Chronic::Span object to calcuate a guess from.
#
# Returns a new Time object.
def guess(span, mode = :middle)
return span if not mode
return span.begin + span.width / 2 if span.width > 1 and (mode == true or mode == :middle)
return span.end if mode == :end
span.begin
end
# List of Handler definitions. See Chronic.parse for a list of options this
# method accepts.
#
# options - An optional Hash of configuration options.
#
# Returns a Hash of Handler definitions.
def definitions(options = {})
options[:endian_precedence] ||= [:middle, :little]
@@definitions ||= {
:time => [
Handler.new([:repeater_time, :repeater_day_portion?], nil)
],
:date => [
Handler.new([:repeater_day_name, :repeater_month_name, :scalar_day, :repeater_time, [:separator_slash?, :separator_dash?], :time_zone, :scalar_year], :handle_generic),
Handler.new([:repeater_day_name, :repeater_month_name, :scalar_day], :handle_rdn_rmn_sd),
Handler.new([:repeater_day_name, :repeater_month_name, :scalar_day, :scalar_year], :handle_rdn_rmn_sd_sy),
Handler.new([:repeater_day_name, :repeater_month_name, :ordinal_day], :handle_rdn_rmn_od),
Handler.new([:repeater_day_name, :repeater_month_name, :ordinal_day, :scalar_year], :handle_rdn_rmn_od_sy),
Handler.new([:repeater_day_name, :repeater_month_name, :scalar_day, :separator_at?, 'time?'], :handle_rdn_rmn_sd),
Handler.new([:repeater_day_name, :repeater_month_name, :ordinal_day, :separator_at?, 'time?'], :handle_rdn_rmn_od),
Handler.new([:repeater_day_name, :ordinal_day, :separator_at?, 'time?'], :handle_rdn_od),
Handler.new([:scalar_year, [:separator_slash, :separator_dash], :scalar_month, [:separator_slash, :separator_dash], :scalar_day, :repeater_time, :time_zone], :handle_generic),
Handler.new([:ordinal_day], :handle_generic),
Handler.new([:repeater_month_name, :scalar_day, :scalar_year], :handle_rmn_sd_sy),
Handler.new([:repeater_month_name, :ordinal_day, :scalar_year], :handle_rmn_od_sy),
Handler.new([:repeater_month_name, :scalar_day, :scalar_year, :separator_at?, 'time?'], :handle_rmn_sd_sy),
Handler.new([:repeater_month_name, :ordinal_day, :scalar_year, :separator_at?, 'time?'], :handle_rmn_od_sy),
Handler.new([:repeater_month_name, [:separator_slash?, :separator_dash?], :scalar_day, :separator_at?, 'time?'], :handle_rmn_sd),
Handler.new([:repeater_time, :repeater_day_portion?, :separator_on?, :repeater_month_name, :scalar_day], :handle_rmn_sd_on),
Handler.new([:repeater_month_name, :ordinal_day, :separator_at?, 'time?'], :handle_rmn_od),
Handler.new([:ordinal_day, :repeater_month_name, :scalar_year, :separator_at?, 'time?'], :handle_od_rmn_sy),
Handler.new([:ordinal_day, :repeater_month_name, :separator_at?, 'time?'], :handle_od_rmn),
Handler.new([:ordinal_day, :grabber?, :repeater_month, :separator_at?, 'time?'], :handle_od_rm),
Handler.new([:scalar_year, :repeater_month_name, :ordinal_day], :handle_sy_rmn_od),
Handler.new([:repeater_time, :repeater_day_portion?, :separator_on?, :repeater_month_name, :ordinal_day], :handle_rmn_od_on),
Handler.new([:repeater_month_name, :scalar_year], :handle_rmn_sy),
Handler.new([:scalar_day, :repeater_month_name, :scalar_year, :separator_at?, 'time?'], :handle_sd_rmn_sy),
Handler.new([:scalar_day, [:separator_slash?, :separator_dash?], :repeater_month_name, :separator_at?, 'time?'], :handle_sd_rmn),
Handler.new([:scalar_year, [:separator_slash, :separator_dash], :scalar_month, [:separator_slash, :separator_dash], :scalar_day, :separator_at?, 'time?'], :handle_sy_sm_sd),
Handler.new([:scalar_year, [:separator_slash, :separator_dash], :scalar_month], :handle_sy_sm),
Handler.new([:scalar_month, [:separator_slash, :separator_dash], :scalar_year], :handle_sm_sy),
Handler.new([:scalar_day, [:separator_slash, :separator_dash], :repeater_month_name, [:separator_slash, :separator_dash], :scalar_year, :repeater_time?], :handle_sm_rmn_sy),
Handler.new([:scalar_year, [:separator_slash, :separator_dash], :scalar_month, [:separator_slash, :separator_dash], :scalar?, :time_zone], :handle_generic),
],
:anchor => [
Handler.new([:separator_on?, :grabber?, :repeater, :separator_at?, :repeater?, :repeater?], :handle_r),
Handler.new([:grabber?, :repeater, :repeater, :separator?, :repeater?, :repeater?], :handle_r),
Handler.new([:repeater, :grabber, :repeater], :handle_r_g_r)
],
:arrow => [
Handler.new([:scalar, :repeater, :pointer], :handle_s_r_p),
Handler.new([:scalar, :repeater, :separator_and?, :scalar, :repeater, :pointer, :separator_at?, 'anchor'], :handle_s_r_a_s_r_p_a),
Handler.new([:pointer, :scalar, :repeater], :handle_p_s_r),
Handler.new([:scalar, :repeater, :pointer, :separator_at?, 'anchor'], :handle_s_r_p_a)
],
:narrow => [
Handler.new([:ordinal, :repeater, :separator_in, :repeater], :handle_o_r_s_r),
Handler.new([:ordinal, :repeater, :grabber, :repeater], :handle_o_r_g_r)
]
}
endians = [
Handler.new([:scalar_month, [:separator_slash, :separator_dash], :scalar_day, [:separator_slash, :separator_dash], :scalar_year, :separator_at?, 'time?'], :handle_sm_sd_sy),
Handler.new([:scalar_month, [:separator_slash, :separator_dash], :scalar_day, :separator_at?, 'time?'], :handle_sm_sd),
Handler.new([:scalar_day, [:separator_slash, :separator_dash], :scalar_month, :separator_at?, 'time?'], :handle_sd_sm),
Handler.new([:scalar_day, [:separator_slash, :separator_dash], :scalar_month, [:separator_slash, :separator_dash], :scalar_year, :separator_at?, 'time?'], :handle_sd_sm_sy)
]
case endian = Array(options[:endian_precedence]).first
when :little
@@definitions.merge(:endian => endians.reverse)
when :middle
@@definitions.merge(:endian => endians)
else
raise ArgumentError, "Unknown endian option '#{endian}'"
end
end
private
def tokenize(text, options)
text = pre_normalize(text)
tokens = text.split(' ').map { |word| Token.new(word) }
[Repeater, Grabber, Pointer, Scalar, Ordinal, Separator, Sign, TimeZone].each do |tok|
tok.scan(tokens, options)
end
tokens.select { |token| token.tagged? }
end
def tokens_to_span(tokens, options)
definitions = definitions(options)
(definitions[:endian] + definitions[:date]).each do |handler|
if handler.match(tokens, definitions)
good_tokens = tokens.select { |o| !o.get_tag Separator }
return handler.invoke(:date, good_tokens, self, options)
end
end
definitions[:anchor].each do |handler|
if handler.match(tokens, definitions)
good_tokens = tokens.select { |o| !o.get_tag Separator }
return handler.invoke(:anchor, good_tokens, self, options)
end
end
definitions[:arrow].each do |handler|
if handler.match(tokens, definitions)
good_tokens = tokens.reject { |o| o.get_tag(SeparatorAt) || o.get_tag(SeparatorSlash) || o.get_tag(SeparatorDash) || o.get_tag(SeparatorComma) || o.get_tag(SeparatorAnd) }
return handler.invoke(:arrow, good_tokens, self, options)
end
end
definitions[:narrow].each do |handler|
if handler.match(tokens, definitions)
return handler.invoke(:narrow, tokens, self, options)
end
end
puts "-none" if Chronic.debug
return nil
end
end
end
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