Class: Chronic::Parser

Inherits:
Object
  • Object
show all
Includes:
Handlers
Defined in:
lib/chronic/parser.rb

Constant Summary collapse

DEFAULT_OPTIONS =

Hash of default configuration options.

{
  :context => :future,
  :now => nil,
  :hours24 => nil,
  :week_start => :sunday,
  :guess => true,
  :ambiguous_time_range => 6,
  :endian_precedence    => [:middle, :little],
  :ambiguous_year_future_bias => 50
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Handlers

day_or_time, dealias_and_disambiguate_times, find_within, get_anchor, get_repeaters, handle_generic, handle_m_d, handle_o_r_g_r, handle_o_r_s_r, handle_od_rm, handle_od_rmn, handle_od_rmn_sy, handle_orr, handle_p_s_r, handle_r, handle_r_g_r, handle_rdn_od, handle_rdn_rmn_od, handle_rdn_rmn_od_sy, handle_rdn_rmn_sd, handle_rdn_rmn_sd_sy, handle_rmn_od, handle_rmn_od_on, handle_rmn_od_sy, handle_rmn_s_r_p, handle_rmn_sd, handle_rmn_sd_on, handle_rmn_sd_sy, handle_rmn_sy, handle_rqn_sy, handle_s_r_a_s_r_p_a, handle_s_r_p, handle_s_r_p_a, handle_sd_rmn, handle_sd_rmn_sy, handle_sd_sm, handle_sd_sm_sy, handle_sm_rmn_sy, handle_sm_sd, handle_sm_sd_sy, handle_sm_sy, handle_srp, handle_sy_rmn_od, handle_sy_rqn, handle_sy_sm, handle_sy_sm_sd, handle_year_and_month, month_overflow?, time_with_rollover

Constructor Details

#initialize(options = {}) ⇒ Parser

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.
:week_start - By default, the parser assesses weeks start on
          sunday but you can change this value to :monday if
          needed.
: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.



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# File 'lib/chronic/parser.rb', line 57

def initialize(options = {})
  validate_options!(options)
  @options = DEFAULT_OPTIONS.merge(options)
  @now = options[:now] || Chronic.time_class.now
end

Instance Attribute Details

#now ⇒ Object

Returns the value of attribute now.



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# File 'lib/chronic/parser.rb', line 20

def now
  @now
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/chronic/parser.rb', line 21

def options
  @options
end

Instance Method Details

#definitions(options = {}) ⇒ Object

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.



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# File 'lib/chronic/parser.rb', line 165

def definitions(options = {})
  SpanDictionary.new(options).definitions
end

#guess(span, mode = :middle) ⇒ Object

Guess a specific time within the given span.

span - The Chronic::Span object to calcuate a guess from.

Returns a new Time object.



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# File 'lib/chronic/parser.rb', line 152

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

#parse(text) ⇒ Object

Parse “text” with the given options Returns either a Time or Chronic::Span, depending on the value of options



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# File 'lib/chronic/parser.rb', line 65

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

#pre_normalize(text) ⇒ Object

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.



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# File 'lib/chronic/parser.rb', line 95

def pre_normalize(text)
  text = text.to_s.downcase
  text.gsub!(/\b(\d{1,2})\.(\d{1,2})\.(\d{4})\b/, '\3 / \2 / \1')
  text.gsub!(/\b([ap])\.m\.?/, '\1m')
  text.gsub!(/(\s+|:\d{2}|:\d{2}\.\d+)\-(\d{2}:?\d{2})\b/, '\1tzminus\2')
  text.gsub!(/\./, ':')
  text.gsub!(/([ap]):m:?/, '\1m')
  text.gsub!(/'(\d{2})\b/) do
    number = $1.to_i

    if Chronic::Date::could_be_year?(number)
      Chronic::Date::make_year(number, options[:ambiguous_year_future_bias])
    else
      number
    end
  end
  text.gsub!(/['"]/, '')
  text.gsub!(/,/, ' ')
  text.gsub!(/^second /, '2nd ')
  text.gsub!(/\bsecond (of|day|month|hour|minute|second|quarter)\b/, '2nd \1')
  text.gsub!(/\bthird quarter\b/, '3rd q')
  text.gsub!(/\bfourth quarter\b/, '4th q')
  text.gsub!(/quarters?(\s+|$)(?!to|till|past|after|before)/, 'q\1')
  text = Numerizer.numerize(text)
  text.gsub!(/\b(\d)(?:st|nd|rd|th)\s+q\b/, 'q\1')
  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|midday\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