Class: TZInfo::TZDataParser

Inherits:
Object
  • Object
show all
Defined in:
lib/tzinfo/tzdataparser.rb

Overview

Parses tzdata from elsie.nci.nih.gov/pub/ and transforms it into a set of Ruby modules that can be used through Timezone and Country.

Normally, this class wouldn’t be used. It is only run to update the timezone data and index modules.

Constant Summary collapse

MIN_YEAR =

Minimum year that will be considered.

1800
MAX_YEAR =

Maximum year that will be considered.

2050

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input_dir, output_dir) ⇒ TZDataParser

Initializes a new TZDataParser. input_dir must contain the extracted tzdata tarball. output_dir is the location to output the modules (in definitions and indexes directories).



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# File 'lib/tzinfo/tzdataparser.rb', line 59

def initialize(input_dir, output_dir)
  super()
  @input_dir = input_dir
  @output_dir = output_dir      
  @rule_sets = {}
  @zones = {}
  @countries = {}
  @no_rules = TZDataNoRules.new
  @generate_zones = true
  @generate_countries = true
  @only_zones = []      
  @exclude_zones = []      
end

Instance Attribute Details

#exclude_zones ⇒ Object

Zones to exclude from generation when not using only_zones (set to an array containing zone identifiers).



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# File 'lib/tzinfo/tzdataparser.rb', line 54

def exclude_zones
  @exclude_zones
end

#generate_countries ⇒ Object

Whether to generate country definitions (set to false to stop countries being generated).



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# File 'lib/tzinfo/tzdataparser.rb', line 46

def generate_countries
  @generate_countries
end

#generate_zones ⇒ Object

Whether to generate zone definitions (set to false to stop zones being generated).



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# File 'lib/tzinfo/tzdataparser.rb', line 42

def generate_zones
  @generate_zones
end

#only_zones ⇒ Object

Limit the set of zones to generate (set to an array containing zone identifiers).



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# File 'lib/tzinfo/tzdataparser.rb', line 50

def only_zones
  @only_zones
end

Class Method Details

.parse_month(month) ⇒ Object

Parses a month specified in the tz data and converts it to a number between 1 and 12 representing January to December.



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# File 'lib/tzinfo/tzdataparser.rb', line 112

def self.parse_month(month)
  lower = month.downcase
  if lower =~ /^jan/
    @month = 1
  elsif lower =~ /^feb/
    @month = 2
  elsif lower =~ /^mar/
    @month = 3
  elsif lower =~ /^apr/
    @month = 4
  elsif lower =~ /^may/
    @month = 5
  elsif lower =~ /^jun/
    @month = 6
  elsif lower =~ /^jul/
    @month = 7
  elsif lower =~ /^aug/
    @month = 8
  elsif lower =~ /^sep/
    @month = 9
  elsif lower =~ /^oct/
    @month = 10
  elsif lower =~ /^nov/
    @month = 11
  elsif lower =~ /^dec/
    @month = 12
  else
    raise "Invalid month: #{month}"
  end
end

.parse_offset(offset) ⇒ Object

Parses an offset string [-]h:m:s (minutes and seconds are optional). Returns the offset in seconds.



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# File 'lib/tzinfo/tzdataparser.rb', line 145

def self.parse_offset(offset)
  raise "Invalid time: #{offset}" if offset !~ /^(-)?(?:([0-9]+)(?::([0-9]+)(?::([0-9]+))?)?)?$/
  
  negative = !$1.nil?      
  hour = $2.nil? ? 0 : $2.to_i
  minute = $3.nil? ? 0 : $3.to_i
  second = $4.nil? ? 0 : $4.to_i
  
  seconds = hour
  seconds = seconds * 60
  seconds = seconds + minute
  seconds = seconds * 60
  seconds = seconds + second
  seconds = -seconds if negative
  seconds
end

.quote_str(str) ⇒ Object

Encloses the string in single quotes and escapes any single quotes in the content.



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# File 'lib/tzinfo/tzdataparser.rb', line 164

def self.quote_str(str)
  "'#{str.gsub('\'', '\\\\\'')}'"
end

Instance Method Details

#execute ⇒ Object

Reads the tzdata source and generates the classes. Takes a long time to run. Currently outputs debugging information to standard out.



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# File 'lib/tzinfo/tzdataparser.rb', line 75

def execute
  files = Dir.entries(@input_dir).select do |file|
    file =~ /\A[^\.]+\z/ &&            
      !%w(leapseconds leapseconds.awk leap-seconds.list Makefile README SOURCE).include?(file) &&
      File.file?(File.join(@input_dir, file))
  end

  files.each {|file| load_rules(file) }
  files.each {|file| load_zones(file) }
  files.each {|file| load_links(file) }
  
  load_countries
  
  if @generate_zones
    modules = []
    
    if @only_zones.nil? || @only_zones.empty?
      @zones.each_value {|zone|
        zone.write_module(@output_dir) unless @exclude_zones.include?(zone.name)
      }
    else
      @only_zones.each {|id|
        zone = @zones[id]
        zone.write_module(@output_dir)            
      }          
    end
    
    write_timezones_index
  end
  
  if @generate_countries        
    write_countries_index
  end
end