/
ruby_data_source.rb
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/
ruby_data_source.rb
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module TZInfo
# A DataSource that loads data from the set of Ruby modules included in the
# TZInfo::Data library (tzinfo-data gem).
#
# To have TZInfo use this DataSource, call TZInfo::DataSource.set as follows:
#
# TZInfo::DataSource.set(:ruby)
class RubyDataSource < DataSource
# Whether the timezone index has been loaded yet.
@@timezone_index_loaded = false
# Whether the country index has been loaded yet.
@@country_index_loaded = false
# Initializes a new RubyDataSource instance.
def initialize
tzinfo_data = File.join('tzinfo', 'data')
begin
require(tzinfo_data)
data_file = File.join('', 'tzinfo', 'data.rb')
path = $".reverse_each.detect {|p| p.end_with?(data_file) }
if path
@base_path = RubyCoreSupport.untaint(File.join(File.dirname(path), 'data'))
else
@base_path = tzinfo_data
end
rescue LoadError
@base_path = tzinfo_data
end
end
# Returns a TimezoneInfo instance for a given identifier.
# Raises InvalidTimezoneIdentifier if the timezone is not found or the
# identifier is invalid.
def load_timezone_info(identifier)
raise InvalidTimezoneIdentifier, 'Invalid identifier' if identifier !~ /\A[A-Za-z0-9+\-_]+(\/[A-Za-z0-9+\-_]+)*\z/
identifier = identifier.gsub(/-/, '__m__').gsub(/\+/, '__p__')
# Untaint identifier after it has been reassigned to a new string. We
# don't want to modify the original identifier. identifier may also be
# frozen and therefore cannot be untainted.
RubyCoreSupport.untaint(identifier)
identifier = identifier.split('/')
begin
require_definition(identifier)
m = Data::Definitions
identifier.each {|part|
m = m.const_get(part)
}
m.get
rescue LoadError, NameError => e
raise InvalidTimezoneIdentifier, e.message
end
end
# Returns an array of all the available timezone identifiers.
def timezone_identifiers
load_timezone_index
Data::Indexes::Timezones.timezones
end
# Returns an array of all the available timezone identifiers for
# data timezones (i.e. those that actually contain definitions).
def data_timezone_identifiers
load_timezone_index
Data::Indexes::Timezones.data_timezones
end
# Returns an array of all the available timezone identifiers that
# are links to other timezones.
def linked_timezone_identifiers
load_timezone_index
Data::Indexes::Timezones.linked_timezones
end
# Returns a CountryInfo instance for the given ISO 3166-1 alpha-2
# country code. Raises InvalidCountryCode if the country could not be found
# or the code is invalid.
def load_country_info(code)
load_country_index
info = Data::Indexes::Countries.countries[code]
raise InvalidCountryCode, 'Invalid country code' unless info
info
end
# Returns an array of all the available ISO 3166-1 alpha-2
# country codes.
def country_codes
load_country_index
Data::Indexes::Countries.countries.keys.freeze
end
# Returns the name of this DataSource.
def to_s
"Ruby DataSource"
end
private
# Requires a zone definition by its identifier (split on /).
def require_definition(identifier)
require_data(*(['definitions'] + identifier))
end
# Requires an index by its name.
def require_index(name)
require_data(*['indexes', name])
end
# Requires a file from tzinfo/data.
def require_data(*file)
require(File.join(@base_path, *file))
end
# Loads in the index of timezones if it hasn't already been loaded.
def load_timezone_index
unless @@timezone_index_loaded
require_index('timezones')
@@timezone_index_loaded = true
end
end
# Loads in the index of countries if it hasn't already been loaded.
def load_country_index
unless @@country_index_loaded
require_index('countries')
@@country_index_loaded = true
end
end
end
end