Class: Chronic::Scalar

Inherits:
Tag
  • Object
show all
Defined in:
lib/chronic/scalar.rb

Overview

:nodoc:

Direct Known Subclasses

ScalarDay, ScalarMonth, ScalarYear

Instance Attribute Summary

Attributes inherited from Tag

#type

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Tag

#initialize, #start=

Constructor Details

This class inherits a constructor from Chronic::Tag

Class Method Details

.scan(tokens) ⇒ Object


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# File 'lib/chronic/scalar.rb', line 4

def self.scan(tokens)
  # for each token
  tokens.each_index do |i|
    if t = self.scan_for_scalars(tokens[i], tokens[i + 1]) then tokens[i].tag(t) end
    if t = self.scan_for_days(tokens[i], tokens[i + 1]) then tokens[i].tag(t) end
    if t = self.scan_for_months(tokens[i], tokens[i + 1]) then tokens[i].tag(t) end
    if t = self.scan_for_years(tokens[i], tokens[i + 1]) then tokens[i].tag(t) end
  end
  tokens
end

.scan_for_days(token, post_token) ⇒ Object


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# File 'lib/chronic/scalar.rb', line 24

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 && %w{am pm morning afternoon evening night}.include?(post_token.word))
      return ScalarDay.new(toi)
    end
  end
  return nil
end

.scan_for_months(token, post_token) ⇒ Object


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# File 'lib/chronic/scalar.rb', line 34

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 && %w{am pm morning afternoon evening night}.include?(post_token.word))
      return ScalarMonth.new(toi)
    end
  end
  return nil
end

.scan_for_scalars(token, post_token) ⇒ Object


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# File 'lib/chronic/scalar.rb', line 15

def self.scan_for_scalars(token, post_token)
  if token.word =~ /^\d*$/
    unless post_token && %w{am pm morning afternoon evening night}.include?(post_token)
      return Scalar.new(token.word.to_i)
    end
  end
  return nil
end

.scan_for_years(token, post_token) ⇒ Object


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# File 'lib/chronic/scalar.rb', line 44

def self.scan_for_years(token, post_token)
  if token.word =~ /^([1-9]\d)?\d\d?$/
    unless post_token && %w{am pm morning afternoon evening night}.include?(post_token.word)
      # Ruby 1.9.2 accepts 2 digit years so we need to guess
      # Of course, this means there is no way to enter a date
      # that happened before 100.  Probably an OK tradeoff
      # as it didn't work before, either.
      year = token.word.to_i
      if year < 100 
        this_year = Chronic.time_class.now.year      
        suffix = this_year.to_s.slice(-2,2).to_i
        year = this_year + (year - suffix)

        # We could just split 50/50 to decide if the user
        # meant the future, however, a user is more likely 
        # going to use a 2 digit number while looking back 
        # unless in the near future.  Splitting the difference
        # at 80/20, however, this could probably be even 
        # more conservative (90/10 even)
        year -= 100 if (year - this_year).to_i >= 20
      end

      return ScalarYear.new(year)
    end
  end
  return nil
end

Instance Method Details

#to_sObject


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# File 'lib/chronic/scalar.rb', line 72

def to_s
  'scalar'
end