An iCalendar.
A Calendar is some meta-information followed by a sequence of components.
Defined components are Event, Todo, Freebusy, Journal, and Timezone, each of which are represented by their own class, though they share many properties in common. For example, Event and Todo may both contain multiple Alarm components.
The iCalendar format is specified by a series of IETF documents:
rfc2445.txt: Internet Calendaring and Scheduling Core Object Specification
rfc2446.txt: iCalendar Transport-Independent Interoperability Protocol (iTIP) Scheduling Events, BusyTime, To-dos and Journal Entries
rfc2447.txt: iCalendar Message-Based Interoperability Protocol
iCalendar files have VERSION:2.0 and vCalendar have VERSION:1.0. iCalendar (RFC 2445) is based on vCalendar, but but is not very compatible. While much appears to be similar, the recurrence rule syntax is completely different.
iCalendars are usually transmitted in files with .ics extensions.
Create a new Icalendar object with the minimal set of fields for a valid Calendar. If specified, fields must be an array of DirectoryInfo::Field objects to add. They can override the the default Calendar fields, so, for example, this can be used to set a custom PRODID field.
# File lib/vpim/icalendar.rb, line 136 def Icalendar.create(fields=[]) di = DirectoryInfo.create( [ DirectoryInfo::Field.create('VERSION', '2.0') ], 'VCALENDAR' ) DirectoryInfo::Field.create_array(fields).each { |f| di.push_unique f } di.push_unique DirectoryInfo::Field.create('PRODID', Vpim::PRODID) di.push_unique DirectoryInfo::Field.create('CALSCALE', "Gregorian") new(di.to_a) end
TODO
# Allows customization of calendar creation. class Maker def initialize #:nodoc: @prodid = Vpim::PRODID end attr :prodid end
# The producer ID defaults to Vpim::PRODID but you can set it to something # specific to your application.
# File lib/vpim/icalendar.rb, line 116 def Icalendar.create2(producer = Vpim::PRODID) #:yield: self # FIXME - make the primary API di = DirectoryInfo.create( [ DirectoryInfo::Field.create('VERSION', '2.0') ], 'VCALENDAR' ) di.push_unique DirectoryInfo::Field.create('PRODID', producer.to_str) di.push_unique DirectoryInfo::Field.create('CALSCALE', "Gregorian") cal = new(di.to_a) if block_given? yield cal end cal end
Create a new Icalendar object with a protocol method of REPLY.
Meeting requests, and such, are Calendar containers with a protocol method of REQUEST, and contains some number of Events, Todos, etc., that may need replying to. In order to reply to any of these components of a request, you must first build a Calendar object to hold your reply components.
This method builds the reply Calendar, you then will add to it replies to the specific components of the request Calendar that you are replying to. If you have any particular fields that you want to be in the Calendar, other than the defaults, then can be supplied as fields, an array of Field objects.
# File lib/vpim/icalendar.rb, line 160 def Icalendar.create_reply(fields=[]) fields << DirectoryInfo::Field.create('METHOD', 'REPLY') Icalendar.create(fields) end
Decode iCalendar data into an array of Icalendar objects.
Since iCalendars are self-delimited (by a BEGIN:VCALENDAR and an END:VCALENDAR), multiple iCalendars can be concatenated into a single file.
cal must be String or IO, or implement each by returning each line in the input as those classes do.
# File lib/vpim/icalendar.rb, line 254 def Icalendar.decode(cal, e = nil) entities = Vpim.expand(Vpim.decode(cal)) # Since all iCalendars must have a begin/end, the top-level should # consist entirely of entities/arrays, even if its a single iCalendar. if entities.detect { |e| ! e.kind_of? Array } raise "Not a valid iCalendar" end calendars = [] entities.each do |e| calendars << new(e) end calendars end
Add an event to this calendar.
Yields an event maker, Icalendar::Vevent::Maker.
# File lib/vpim/icalendar.rb, line 96 def add_event(&block) #:yield:event push Vevent::Maker.make( &block ) end
The value of the CALSCALE: property, or "GREGORIAN" if CALSCALE: is not present.
This is of academic interest only. There aren't any other calendar scales defined, and given that its hard enough just dealing with Gregorian calendars, there probably won't be.
# File lib/vpim/icalendar.rb, line 312 def calscale (@properties['CALSCALE'] || 'GREGORIAN').upcase end
The array of all supported calendar components. If a class is provided, return only the components of that class.
If a block is provided, yield the components instead of returning them.
Examples:
calendar.components(Vpim::Icalendar::Vevent) => array of all calendar components calendar.components(Vpim::Icalendar::Vtodo) {|c| c... } => yield all todo components calendar.components {|c| c... } => yield all components
Note - use of this is mildly deprecated in favour of each, events, todos, journals because those won't return timezones, and will return Enumerators if called without a block.
# File lib/vpim/icalendar.rb, line 334 def components(klass=Object) #:yields:component klass ||= Object unless block_given? return @components.select{|c| klass === c}.freeze end @components.each do |c| if klass === c yield c end end self end
Enumerate the top-level calendar components. Yields them if a block is provided, otherwise returns an Enumerator.
This skips components that are only internally meaningful to iCalendar, such as timezone definitions.
# File lib/vpim/icalendar.rb, line 356 def each(klass=nil, &block) # :yield: component unless block return Enumerable::Enumerator.new(self, :each, klass) end components(klass, &block) end
Encode the Calendar as a string. The width is the maximum width of the encoded lines, it can be specified, but is better left to the default.
# File lib/vpim/icalendar.rb, line 179 def encode(width=nil) # We concatenate the fields of all objects, create a DirInfo, then # encode it. di = DirectoryInfo.create(self.fields.flatten) di.encode(width) end
Short-hand for each(Icalendar::Vevent).
# File lib/vpim/icalendar.rb, line 364 def events(&block) #:yield: Vevent each(Icalendar::Vevent, &block) end
Short-hand for each(Icalendar::Vjournal).
# File lib/vpim/icalendar.rb, line 374 def journals(&block) #:yield: Vjournal each(Icalendar::Vjournal, &block) end
The value of the PRODID field, an unstructured string meant to identify the software which encoded the Calendar data.
# File lib/vpim/icalendar.rb, line 287 def producer #f = @properties.field('PRODID') #f && f.to_text @properties.text('PRODID').first end
The value of the METHOD field. Protocol methods are used when iCalendars are exchanged in a calendar messaging system, such as iTIP or iMIP. When METHOD is not specified, the Calendar object is merely being used to transport a snapshot of some calendar information; without the intention of conveying a scheduling semantic.
Note that this method can't be called method, thats already a method of Object.
# File lib/vpim/icalendar.rb, line 301 def protocol m = @properties['METHOD'] m ? m.upcase : m end
Check if the protocol method is method
# File lib/vpim/icalendar.rb, line 202 def protocol?(method) Vpim::Methods.casecmp?(protocol, method) end
Push a calendar component onto the calendar.
# File lib/vpim/icalendar.rb, line 189 def push(component) case component when Vevent, Vtodo, Vjournal @components << component else raise ArgumentError, "can't add a #{component.type} to a calendar" end self end
Short-hand for each(Icalendar::Vtodo).
# File lib/vpim/icalendar.rb, line 369 def todos(&block) #:yield: Vtodo each(Icalendar::Vtodo, &block) end
The iCalendar version multiplied by 10 as an Integer. iCalendar must have a version of 20, and vCalendar must have a version of 10.
# File lib/vpim/icalendar.rb, line 274 def version v = @properties['VERSION'] unless v raise InvalidEncodingError, "Invalid calendar, no version field!" end v = v.to_f * 10 v = v.to_i end
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