/usr/lib/ruby/vendor_ruby/tzinfo/zoneinfo_data_source.rb is in ruby-tzinfo 1.1.0-1.
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# Copyright (c) 2012-2013 Philip Ross
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#++
module TZInfo
# An InvalidZoneinfoDirectory exception is raised if the DataSource is
# set to a specific zoneinfo path, which is not a valid zoneinfo directory
# (i.e. a directory containing index files named iso3166.tab and zone.tab
# as well as other timezone files).
class InvalidZoneinfoDirectory < StandardError
end
# A ZoneinfoDirectoryNotFound exception is raised if no valid zoneinfo
# directory could be found when checking the paths listed in
# ZoneinfoDataSource.search_path. A valid zoneinfo directory is one that
# contains index files named iso3166.tab and zone.tab as well as other
# timezone files.
class ZoneinfoDirectoryNotFound < StandardError
end
# A DataSource that loads data from a 'zoneinfo' directory containing
# compiled "TZif" version 2 (or earlier) files in addition to zones.tab
# and iso3166.tab index files.
#
# To have TZInfo load the system zoneinfo files, call TZInfo::DataSource.set
# as follows:
#
# TZInfo::DataSource.set(:zoneinfo)
#
# To load zoneinfo files from a particular directory, pass the directory to
# TZInfo::DataSource.set:
#
# TZInfo::DataSource.set(:zoneinfo, directory)
#
# Note that the platform used at runtime may limit the range of available
# transition data that can be loaded from zoneinfo files. There are two
# factors to consider:
#
# First of all, the zoneinfo support in TZInfo makes use of Ruby's Time class.
# On 32-bit builds of Ruby 1.8, the Time class only supports 32-bit
# timestamps. This means that only Times between 1901-12-13 20:45:52 and
# 2038-01-19 03:14:07 can be represented. Furthermore, certain platforms only
# allow for positive 32-bit timestamps (notably Windows), making the earliest
# representable time 1970-01-01 00:00:00.
#
# 64-bit builds of Ruby 1.8 and all builds of Ruby 1.9 support 64-bit
# timestamps. This means that there is no practical restriction on the range
# of the Time class on these platforms.
#
# TZInfo will only load transitions that fall within the supported range of
# the Time class. Any queries performed on times outside of this range may
# give inaccurate results.
#
# The second factor concerns the zoneinfo files. Versions of the 'zic' tool
# (used to build zoneinfo files) that were released prior to February 2006
# created zoneinfo files that used 32-bit integers for transition timestamps.
# Later versions of zic produce zoneinfo files that use 64-bit integers. If
# you have 32-bit zoneinfo files on your system, then any queries falling
# outside of the range 1901-12-13 20:45:52 to 2038-01-19 03:14:07 may be
# inaccurate.
#
# Most modern platforms include 64-bit zoneinfo files. However, Mac OS X (up
# to at least 10.8.4) still uses 32-bit zoneinfo files.
#
# To check whether your zoneinfo files contain 32-bit or 64-bit transition
# data, you can run the following code (substituting the identifier of the
# zone you want to test for zone_identifier):
#
# TZInfo::DataSource.set(:zoneinfo)
# dir = TZInfo::DataSource.get.zoneinfo_dir
# File.open(File.join(dir, zone_identifier), 'r') {|f| f.read(5) }
#
# If the last line returns "TZif\\x00", then you have a 32-bit zoneinfo file.
# If it returns "TZif2" or "TZif3" then you have a 64-bit zoneinfo file.
#
# If you require support for 64-bit transitions, but are restricted to 32-bit
# zoneinfo support, then you may want to consider using TZInfo::RubyDataSource
# instead.
class ZoneinfoDataSource < DataSource
# The default value of ZoneInfoDataSource.search_path.
DEFAULT_SEARCH_PATH = ['/usr/share/zoneinfo', '/usr/share/lib/zoneinfo', '/etc/zoneinfo'].freeze
# Paths to be checked to find the system zoneinfo directory.
@@search_path = DEFAULT_SEARCH_PATH.dup
# An Array of directories that will be checked to find the system zoneinfo
# directory.
#
# Directories are checked in the order they appear in the Array.
#
# The default value is ['/usr/share/zoneinfo', '/usr/share/lib/zoneinfo', '/etc/zoneinfo'].
def self.search_path
@@search_path
end
# Sets the directories to be checked when locating the system zoneinfo
# directory.
#
# Can be set to an Array of directories or a String containing directories
# separated with File::PATH_SEPARATOR.
#
# Directories are checked in the order they appear in the Array or String.
#
# Set to nil to revert to the default paths.
def self.search_path=(search_path)
if search_path
if search_path.kind_of?(String)
@@search_path = search_path.split(File::PATH_SEPARATOR)
else
@@search_path = search_path.collect {|p| p.to_s}
end
else
@@search_path = DEFAULT_SEARCH_PATH.dup
end
end
# The zoneinfo directory being used.
attr_reader :zoneinfo_dir
# Creates a new ZoneinfoDataSource.
#
# If zoneinfo_dir is specified, it will be checked and used as the source
# of zoneinfo files. If the directory does not contain zone.tab and
# iso3166.tab files, InvalidZoneinfoDirectory will be raised.
#
# If zoneinfo_dir is not specified or nil, the paths referenced in
# search_path are searched in order to find a valid zoneinfo directory
# (one that contains files named zone.tab and iso3166.tab). If no valid
# zoneinfo directory is found ZoneinfoDirectoryNotFound will be raised.
def initialize(zoneinfo_dir = nil)
if zoneinfo_dir
unless valid_zoneinfo_dir?(zoneinfo_dir)
raise InvalidZoneinfoDirectory, "#{zoneinfo_dir} is not a directory or doesn't contain iso3166.tab and zone.tab files."
end
@zoneinfo_dir = zoneinfo_dir
else
@zoneinfo_dir = self.class.search_path.detect do |path|
valid_zoneinfo_dir?(path)
end
unless @zoneinfo_dir
raise ZoneinfoDirectoryNotFound, "None of the paths included in TZInfo::ZoneinfoDataSource.search_path are valid zoneinfo directories."
end
end
@zoneinfo_dir = File.expand_path(@zoneinfo_dir).freeze
@zoneinfo_prefix = (@zoneinfo_dir + File::SEPARATOR).freeze
@timezone_index = load_timezone_index.freeze
@country_index = load_country_index.freeze
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)
begin
if @timezone_index.include?(identifier)
path = File.join(@zoneinfo_dir, identifier)
# Untaint path rather than identifier. We don't want to modify
# identifier. identifier may also be frozen and therefore cannot be
# untainted.
path.untaint
begin
ZoneinfoTimezoneInfo.new(identifier, path)
rescue InvalidZoneinfoFile => e
raise InvalidTimezoneIdentifier, e.message
end
else
raise InvalidTimezoneIdentifier, 'Invalid identifier'
end
rescue Errno::ENOENT, Errno::ENAMETOOLONG, Errno::ENOTDIR
raise InvalidTimezoneIdentifier, 'Invalid identifier'
rescue Errno::EACCES => e
raise InvalidTimezoneIdentifier, e.message
end
end
# Returns an array of all the available timezone identifiers.
def timezone_identifiers
@timezone_index
end
# Returns an array of all the available timezone identifiers for
# data timezones (i.e. those that actually contain definitions).
#
# For ZoneinfoDataSource, this will always be identical to
# timezone_identifers.
def data_timezone_identifiers
@timezone_index
end
# Returns an array of all the available timezone identifiers that
# are links to other timezones.
#
# For ZoneinfoDataSource, this will always be an empty array.
def linked_timezone_identifiers
[].freeze
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)
info = @country_index[code]
raise InvalidCountryCode.new, 'Invalid country code' unless info
info
end
# Returns an array of all the available ISO 3166-1 alpha-2
# country codes.
def country_codes
@country_index.keys.freeze
end
# Returns the name and information about this DataSource.
def to_s
"Zoneinfo DataSource: #{@zoneinfo_dir}"
end
# Returns internal object state as a programmer-readable string.
def inspect
"#<#{self.class}: #{@zoneinfo_dir}>"
end
private
# Tests whether a path represents a valid zoneinfo directory (i.e.
# is a directory and contains zone.tab and iso3166.tab files).
def valid_zoneinfo_dir?(path)
File.directory?(path) && File.file?(File.join(path, 'zone.tab')) && File.file?(File.join(path, 'iso3166.tab'))
end
# Scans @zoneinfo_dir and returns an Array of available timezone
# identifiers.
def load_timezone_index
index = []
# Ignoring particular files:
# +VERSION is included in Mac OS X.
# localtime current local timezone (may be a link).
# posix, posixrules and right are directories containing other versions of the zoneinfo files.
# Factory is the compiled in default timezone.
enum_timezones(nil, ['+VERSION', 'localtime', 'posix', 'posixrules', 'right', 'Factory']) do |identifier|
index << identifier
end
index.sort
end
# Recursively scans a directory of timezones, calling the passed in block
# for each identifier found.
def enum_timezones(dir, exclude = [], &block)
Dir.foreach(dir ? File.join(@zoneinfo_dir, dir) : @zoneinfo_dir) do |entry|
unless entry =~ /\./ || exclude.include?(entry)
entry.untaint
path = dir ? File.join(dir, entry) : entry
full_path = File.join(@zoneinfo_dir, path)
if File.directory?(full_path)
enum_timezones(path, [], &block)
elsif File.file?(full_path)
yield path
end
end
end
end
# Uses the iso3166.tab and zone.tab files to build an index of the
# available countries and their timezones.
def load_country_index
zones = {}
File.open(File.join(@zoneinfo_dir, 'zone.tab')) do |file|
file.each_line do |line|
line.chomp!
if line =~ /\A([A-Z]{2})\t(?:([+\-])(\d{2})(\d{2})([+\-])(\d{3})(\d{2})|([+\-])(\d{2})(\d{2})(\d{2})([+\-])(\d{3})(\d{2})(\d{2}))\t([^\t]+)(?:\t([^\t]+))?\z/
code = $1
if $2
latitude = dms_to_rational($2, $3, $4)
longitude = dms_to_rational($5, $6, $7)
else
latitude = dms_to_rational($8, $9, $10, $11)
longitude = dms_to_rational($12, $13, $14, $15)
end
zone_identifier = $16
description = $17
(zones[code] ||= []) <<
CountryTimezone.new(zone_identifier, latitude.numerator, latitude.denominator,
longitude.numerator, longitude.denominator, description)
end
end
end
countries = {}
File.open(File.join(@zoneinfo_dir, 'iso3166.tab')) do |file|
file.each_line do |line|
line.chomp!
if line =~ /\A([A-Z]{2})\t(.+)\z/
code = $1
name = $2
countries[code] = ZoneinfoCountryInfo.new(code, name, zones[code] || [])
end
end
end
countries
end
# Converts degrees, miunutes and seconds to a Rational
def dms_to_rational(sign, degrees, minutes, seconds = nil)
result = degrees.to_i + Rational(minutes.to_i, 60)
result += Rational(seconds.to_i, 3600) if seconds
result = -result if sign == '-'
result
end
end
end
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