Class: Multibyte::Handlers::UnicodeTableGenerator

Inherits:
Object
  • Object
show all
Defined in:
lib/multibyte/generators/generate_tables.rb

Overview

:nodoc:

Constant Summary collapse

BASE_URI = 
"http://www.unicode.org/Public/#{Multibyte::UNICODE_VERSION}/ucd/"
SOURCES = 
{
  :codepoints => BASE_URI + 'UnicodeData.txt',
  :composition_exclusion => BASE_URI + 'CompositionExclusions.txt',
  :grapheme_break_property => BASE_URI + 'auxiliary/GraphemeBreakProperty.txt',
  :cp1252 => 'http://unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WINDOWS/CP1252.TXT'
}

Instance Method Summary collapse

Constructor Details

#initialize ⇒ UnicodeTableGenerator

Returns a new instance of UnicodeTableGenerator.



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# File 'lib/multibyte/generators/generate_tables.rb', line 24

def initialize
  @ucd = UnicodeDatabase.new
  
  default = Codepoint.new
  default.combining_class = 0
  default.uppercase_mapping = 0
  default.lowercase_mapping = 0
  @ucd.codepoints = Hash.new(default)
  
  @ucd.composition_exclusion = []
  @ucd.composition_map = {}
  @ucd.boundary = {}
  @ucd.cp1252 = {}
end

Instance Method Details

#create_composition_map ⇒ Object 



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# File 'lib/multibyte/generators/generate_tables.rb', line 97

def create_composition_map
  @ucd.codepoints.each do |_, cp|
    if !cp.nil? and cp.combining_class == 0 and cp.decomp_type.nil? and !cp.decomp_mapping.nil? and cp.decomp_mapping.length == 2 and @ucd[cp.decomp_mapping[0]].combining_class == 0 and !@ucd.composition_exclusion.include?(cp.code)
      @ucd.composition_map[cp.decomp_mapping[0]] ||= {}
      @ucd.composition_map[cp.decomp_mapping[0]][cp.decomp_mapping[1]] = cp.code
    end
  end
end

#dump_to(filename) ⇒ Object 



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# File 'lib/multibyte/generators/generate_tables.rb', line 133

def dump_to(filename)
  File.open(filename, 'wb') do |f|
    f.write Marshal.dump([@ucd.codepoints, @ucd.composition_exclusion, @ucd.composition_map, @ucd.boundary, @ucd.cp1252])
  end
end

#normalize_boundary_map ⇒ Object 



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# File 'lib/multibyte/generators/generate_tables.rb', line 106

def normalize_boundary_map
  @ucd.boundary.each do |k,v|
    if [:lf, :cr].include? k
      @ucd.boundary[k] = v[0]
    end
  end
end

#parse ⇒ Object 



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# File 'lib/multibyte/generators/generate_tables.rb', line 114

def parse
  SOURCES.each do |type, url|
    filename =  File.join(Dir.tmpdir, "#{url.split('/').last}")
    unless File.exist?(filename)
      $stderr.puts "Downloading #{url.split('/').last}"
      File.open(filename, 'wb') do |target|
        open(url) do |source|
          source.each_line { |line| target.write line }
        end
      end
    end
    File.open(filename) do |file|
      file.each_line { |line| send "parse_#{type}".intern, line }
    end        
  end
  create_composition_map
  normalize_boundary_map
end

#parse_codepoints(line) ⇒ Object 



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# File 'lib/multibyte/generators/generate_tables.rb', line 39

def parse_codepoints(line)
  codepoint = Codepoint.new
  raise "Could not parse input." unless line =~ /^
    ([0-9A-F]+);        # code
    ([^;]+);            # name
    ([A-Z]+);           # general category
    ([0-9]+);           # canonical combining class
    ([A-Z]+);           # bidi class
    (<([A-Z]*)>)?       # decomposition type
    ((\ ?[0-9A-F]+)*);  # decompomposition mapping
    ([0-9]*);           # decimal digit
    ([0-9]*);           # digit
    ([^;]*);            # numeric
    ([YN]*);            # bidi mirrored
    ([^;]*);            # unicode 1.0 name
    ([^;]*);            # iso comment
    ([0-9A-F]*);        # simple uppercase mapping
    ([0-9A-F]*);        # simple lowercase mapping
    ([0-9A-F]*)$/ix     # simple titlecase mapping
  codepoint.code              = $1.hex
  #codepoint.name              = $2
  #codepoint.category          = $3
  codepoint.combining_class   = Integer($4)
  #codepoint.bidi_class        = $5
  codepoint.decomp_type       = $7
  codepoint.decomp_mapping    = ($8=='') ? nil : $8.split.collect { |element| element.hex }
  #codepoint.bidi_mirrored     = ($13=='Y') ? true : false
  codepoint.uppercase_mapping = ($16=='') ? 0 : $16.hex
  codepoint.lowercase_mapping = ($17=='') ? 0 : $17.hex
  #codepoint.titlecase_mapping = ($18=='') ? nil : $18.hex
  @ucd.codepoints[codepoint.code] = codepoint
end

#parse_composition_exclusion(line) ⇒ Object 



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# File 'lib/multibyte/generators/generate_tables.rb', line 85

def parse_composition_exclusion(line)
  if line =~ /^([0-9A-F]+)/i
    @ucd.composition_exclusion << $1.hex
  end
end

#parse_cp1252(line) ⇒ Object 



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# File 'lib/multibyte/generators/generate_tables.rb', line 91

def parse_cp1252(line)
  if line =~ /^([0-9A-Fx]+)\s([0-9A-Fx]+)/i
    @ucd.cp1252[$1.hex] = $2.hex
  end
end

#parse_grapheme_break_property(line) ⇒ Object 



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# File 'lib/multibyte/generators/generate_tables.rb', line 72

def parse_grapheme_break_property(line)
  if line =~ /^([0-9A-F\.]+)\s*;\s*([\w]+)\s*#/
    type = $2.downcase.intern
    @ucd.boundary[type] ||= []
    if $1.include? '..'
      parts = $1.split '..'
      @ucd.boundary[type] << (parts[0].hex..parts[1].hex)
    else
      @ucd.boundary[type] << $1.hex
    end
  end
end