Class: Icalendar::Component

Inherits:
Base show all
Defined in:
lib/icalendar/component.rb

Overview

The body of the iCalendar object consists of a sequence of calendar properties and one or more calendar components. The calendar properties are attributes that apply to the calendar as a whole. The calendar components are collections of properties that express a particular calendar semantic. For example, the calendar component can specify an Event, a Todo, a Journal entry, Timezone information, or Freebusy time information, or an Alarm.

Direct Known Subclasses

Alarm, Calendar, Event, Freebusy, Journal, Timezone, Todo

Constant Summary collapse

CAL_EXTENSION_REGEX = 
/\Ax_[a-z_]+=?\Z/
@@multi_properties = 
{}
@@multiline_properties = 
{}

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Base

debug, quiet

Constructor Details

#initialize(name) ⇒ Component 



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# File 'lib/icalendar/component.rb', line 50

def initialize(name)
  @name = name
  @components = Hash.new { |h, k| h[k] = [] }
  @properties = {}

  @@logger.info("New #{@name[1,@name.size].capitalize}...")
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_name, *args, &block) ⇒ Object 



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# File 'lib/icalendar/component.rb', line 408

def method_missing(method_name, *args, &block)
  # Allow proprietary calendar extensions to be set
  #
  # Example:
  #   cal.x_wr_calname = "iCalendar Calendar"
  if method_name =~ CAL_EXTENSION_REGEX

    # Make sure to remove '=' from the end of the method_name so we can
    # define it
    name = method_name.to_s.chomp '='

    self.class.class_eval do
      ical_multiline_property name, name, name
    end
    send method_name, *args
  else
    super
  end
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/icalendar/component.rb', line 44

def name
  @name
end

#properties ⇒ Object

Returns the value of attribute properties.



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# File 'lib/icalendar/component.rb', line 45

def properties
  @properties
end

Instance Method Details

#add_component(component) ⇒ Object Also known as: add, add_event, add_todo, add_journal

Add a sub-component to the current component object.



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# File 'lib/icalendar/component.rb', line 59

def add_component(component)
  @components[component.key_name] << component
end

#chunk_lines(str, length = MAX_LINE_LENGTH, separator = "\r\n ") ⇒ Object 



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# File 'lib/icalendar/component.rb', line 153

def chunk_lines(str, length = MAX_LINE_LENGTH, separator = "\r\n ")
  chunks = str.scan(/.{1,#{length}}/)
  lines = chunks.join(separator) << separator
  lines.gsub(/ *$/, '')
end

#custom_property(name, value) ⇒ Object

TODO: Look into the x-property, x-param stuff… This would really only be needed for subclassing to add additional properties to an application using the API.



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# File 'lib/icalendar/component.rb', line 183

def custom_property(name, value)
  @properties[name] = value
end

#escape_chars(value) ⇒ Object 



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# File 'lib/icalendar/component.rb', line 149

def escape_chars(value)
  value.gsub("\\", "\\\\").gsub("\r\n", "\n").gsub("\r", "\n").gsub("\n", "\\n").gsub(",", "\\,").gsub(";", "\\;")
end

#fix_conflict_with_built_in(key) ⇒ Object

Take out underscore for property names that conflicted with built-in words.



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# File 'lib/icalendar/component.rb', line 145

def fix_conflict_with_built_in(key)
  key.sub(/\Aip_/, '')
end

#multi_property?(name) ⇒ Boolean 



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# File 'lib/icalendar/component.rb', line 187

def multi_property?(name)
  @@multi_properties.has_key?(name.downcase)
end

#multiline_property?(name) ⇒ Boolean 



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# File 'lib/icalendar/component.rb', line 191

def multiline_property?(name)
  @@multiline_properties.has_key?(name.downcase)
end

#new_uid ⇒ Object

Used to generate unique component ids



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# File 'lib/icalendar/component.rb', line 92

def new_uid
  "#{DateTime.now}_#{rand(999999999)}@#{Socket.gethostname}"
end

#print_component ⇒ Object

Print this icalendar component



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# File 'lib/icalendar/component.rb', line 106

def print_component
  to_ical
end

#print_headers ⇒ Object 



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# File 'lib/icalendar/component.rb', line 176

def print_headers
  "" # subclasses can specify headers
end

#print_parameters(value) ⇒ Object

Print the parameters for a specific property.



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# File 'lib/icalendar/component.rb', line 160

def print_parameters(value)
  return "" unless value.respond_to?(:ical_params)

  Array(value.ical_params).map do |key, val|
    val = Array(val)
    next if val.empty?

    escaped = val.map { |v| Parser.escape(v.to_ical) }.join(',')
    ";#{key}=" << escaped
  end.join
end

#print_properties(properties = properties_to_print) ⇒ Object 



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# File 'lib/icalendar/component.rb', line 122

def print_properties(properties = properties_to_print)
  excludes = %w(geo rrule categories exdate)
  properties.sort.map do |key, val|
    property = fix_conflict_with_built_in(key)
    prelude = property.gsub(/_/, '-').upcase

    if multiline_property? property
      val.map do |part|
        params = print_parameters part
        value = escape_chars ":#{part.to_ical}"
        chunk_lines "#{prelude}#{params}#{value}"
      end.join
    else
      params = print_parameters val
      value = ":#{val.to_ical}"
      value = escape_chars(value) unless excludes.include? property
      chunk_lines "#{prelude}#{params}#{value}"
    end
  end.join
end

#print_subcomponents ⇒ Object 



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# File 'lib/icalendar/component.rb', line 110

def print_subcomponents
  @components.values.map do |component_parts|
    Array(component_parts).map &:to_ical
  end.join
end

#printer ⇒ Object 



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# File 'lib/icalendar/component.rb', line 116

def printer
  ["BEGIN:#{@name.upcase}\r\n",
  yield,
  "END:#{@name.upcase}\r\n"].join
end

#properties_to_print ⇒ Object 



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# File 'lib/icalendar/component.rb', line 172

def properties_to_print
  @properties # subclasses can exclude properties
end

#remove_component(component) ⇒ Object Also known as: remove, remove_event, remove_todo, remove_journal 



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# File 'lib/icalendar/component.rb', line 75

def remove_component(component)
  @components[component.key_name].delete(component)
end

#respond_to_missing?(method_name, include_private = false) ⇒ Boolean 



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# File 'lib/icalendar/component.rb', line 428

def respond_to_missing?(method_name, include_private = false)
  method_name.to_s =~ CAL_EXTENSION_REGEX || super
end

#to_ical ⇒ Object

Output in the icalendar format



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# File 'lib/icalendar/component.rb', line 97

def to_ical
  printer do
    [print_headers,
      print_properties,
      print_subcomponents].join
  end
end