Class: ActiveSupport::Duration::ISO8601Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/active_support/duration/iso8601_parser.rb

Overview

Parses a string formatted according to ISO 8601 Duration into the hash.

See ISO 8601 for more information.

This parser allows negative parts to be present in pattern.

Defined Under Namespace

Classes: ParsingError

Constant Summary collapse

PERIOD_OR_COMMA = 
/\.|,/
PERIOD = 
".".freeze
COMMA = 
",".freeze
SIGN_MARKER = 
/\A\-|\+|/
DATE_MARKER = 
/P/
TIME_MARKER = 
/T/
DATE_COMPONENT = 
/(\-?\d+(?:[.,]\d+)?)(Y|M|D|W)/
TIME_COMPONENT = 
/(\-?\d+(?:[.,]\d+)?)(H|M|S)/
DATE_TO_PART = 
{ "Y" => :years, "M" => :months, "W" => :weeks, "D" => :days }
TIME_TO_PART = 
{ "H" => :hours, "M" => :minutes, "S" => :seconds }
DATE_COMPONENTS = 
[:years, :months, :days]
TIME_COMPONENTS = 
[:hours, :minutes, :seconds]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(string) ⇒ ISO8601Parser

Returns a new instance of ISO8601Parser.



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# File 'lib/active_support/duration/iso8601_parser.rb', line 35

def initialize(string)
  @scanner = StringScanner.new(string)
  @parts = {}
  @mode = :start
  @sign = 1
end

Instance Attribute Details

#mode ⇒ Object

Returns the value of attribute mode.



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# File 'lib/active_support/duration/iso8601_parser.rb', line 33

def mode
  @mode
end

#parts ⇒ Object (readonly)

Returns the value of attribute parts.



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# File 'lib/active_support/duration/iso8601_parser.rb', line 32

def parts
  @parts
end

#scanner ⇒ Object (readonly)

Returns the value of attribute scanner.



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# File 'lib/active_support/duration/iso8601_parser.rb', line 32

def scanner
  @scanner
end

#sign ⇒ Object

Returns the value of attribute sign.



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# File 'lib/active_support/duration/iso8601_parser.rb', line 33

def sign
  @sign
end

Instance Method Details

#parse! ⇒ Object 



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# File 'lib/active_support/duration/iso8601_parser.rb', line 42

def parse!
  while !finished?
    case mode
    when :start
      if scan(SIGN_MARKER)
        self.sign = (scanner.matched == "-") ? -1 : 1
        self.mode = :sign
      else
        raise_parsing_error
      end

    when :sign
      if scan(DATE_MARKER)
        self.mode = :date
      else
        raise_parsing_error
      end

    when :date
      if scan(TIME_MARKER)
        self.mode = :time
      elsif scan(DATE_COMPONENT)
        parts[DATE_TO_PART[scanner[2]]] = number * sign
      else
        raise_parsing_error
      end

    when :time
      if scan(TIME_COMPONENT)
        parts[TIME_TO_PART[scanner[2]]] = number * sign
      else
        raise_parsing_error
      end

    end
  end

  validate!
  parts
end