Class: Text::Hyphen

Inherits:
Object
  • Object
show all
Defined in:
lib/text/hyphen.rb

Overview

Introduction

Text::Hyphen -- hyphenate words using modified versions of TeX hyphenation patterns.

Usage

require 'text/hyphen'
hh = Text::Hyphen.new(:language => 'en_us', :left => 2, :right => 2)
  # Defaults to the above
hh = TeX::Hyphen.new

word = "representation"
points = hyp.hyphenate(word)    #=> [3, 5, 8, 10]
puts hyp.visualize(word)        #=> rep-re-sen-ta-tion

en = Text::Hyphen.new(:left => 0, :right => 0)
fr = Text::Hyphen.new(:language = "fr", :left => 0, :right => 0)
puts en.visualise("organiser")  #=> or-gan-iser
puts fr.visualise("organiser")  #=> or-ga-ni-ser

Description

Creates a new Hyphen object and loads the language patterns into memory. The hyphenator can then be asked for the hyphenation of a word. If no language is specified, then the language en_us (EN_US) is used by default.

Copyright

Copyright (c) 2004 - 2005 Austin Ziegler

Version

1.0.2

Based On

TeX::Hyphen 0.4 Copyright ?? 2003 - 2004 Martin DeMello and Austin Ziegler, in turn based on Perl's TeX::Hyphen

search.cpan.org/author/JANPAZ/TeX-Hyphen-0.140/lib/TeX/Hyphen.pm

Copyright (c) 1997 - 2002 Jan Pazdziora

Licence

Licensing for Text::Hyphen is unfortunately complex because of the various copyrights and licences of the source hyphenation files. Some of these files are available only under the TeX licence and others are available only under the GNU GPL while others are public domain. Each language file has these licences embedded within the file. Please consult each file's licence to ensure that it is compatible with your application.

The copyright on the Text::Hyphen application/library and the Ruby translations of hyphenation files belongs to Austin Ziegler. All other copyrights on original versions still stand; Text::Hyphen is a derivative work of these and other projects.

Application and Compilation Licences

Text::Hyphen, the application/library is licensed under the same terms as Ruby. Note that this specifically refers to the contents of bin/hyphen, lib/text/hyphen.rb, and lib/text/hyphen/language.rb.

Individual language hyphenation files are NOT licensed under these terms, but under the following MIT-style licence and the original hyphenation pattern licenses. The copyright for the original TeX hyphenation files is held by the original authors; any mistakes in conversion of these files to Ruby is attributable to the contributors to the Text::Hyphen package only.

The compilation package Text::Hyphen is licensed under the same terms as Ruby.

Blanket Language Hyphenation File Licence

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.

Defined Under Namespace

Classes: Language

Constant Summary

DEBUG =
false
VERSION =
'1.0.2'
DEFAULT_MIN_LEFT =
2
DEFAULT_MIN_RIGHT =
2

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) {|_self| ... } ⇒ Hyphen

The following initializations are equivalent:

hyp = TeX::Hyphenate.new(:language => "EU")
hyp = TeX::Hyphenate.new { |h| h.language = "EU" }

Yields:

  • (_self)

Yield Parameters:

  • _self (Text::Hyphen)

    the object that the method was called on



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# File 'lib/text/hyphen.rb', line 129

def initialize(options = {}) # :yields self:
  @iso_language = options[:language]
  @left         = options[:left]
  @right        = options[:right]
  @language     = nil

  @cache        = {}
  @vcache       = {}

  @hyphen       = {}
  @begin_hyphen = {}
  @end_hyphen   = {}
  @both_hyphen  = {}
  @exception    = {}

  @first_load = true
  yield self if block_given?
  @first_load = false

  load_language

  @left       ||= DEFAULT_MIN_LEFT
  @right      ||= DEFAULT_MIN_RIGHT
end

Instance Attribute Details

#iso_languageObject (readonly)

Returns the language's ISO 639 ID, e.g., "en_us" or "pt".



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# File 'lib/text/hyphen.rb', line 123

def iso_language
  @iso_language
end

#languageObject

The name of the language to be used in hyphenating words. This will be a two or three character ISO 639 code, with the two character form being the canonical resource name. This will load the language hyphenation definitions from text/hyphen/language/<code> as a Ruby class. The resource 'text/hyphen/language/en_us' defines the language class Text::Hyphen::Language::EN_US. It also defines the secondary forms Text::Hyphen::Language::EN and Text::Hyphen::Language::ENG_US.

Minimal transformations will be performed on the language code provided, such that any dashes are converted to underscores (e.g., 'en-us' becomes 'en_us') and all characters are regularised. Resource names will be downcased and class names will be upcased (e.g., 'Pt' for the Portuguese language becomes 'pt' and 'PT', respectively).

The language may also be specified as an instance of Text::Hyphen::Language.



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# File 'lib/text/hyphen.rb', line 109

def language
  @language
end

#leftObject

No fewer than this number of letters will show up to the left of the hyphen. This overrides the default specified in the language.



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# File 'lib/text/hyphen.rb', line 89

def left
  @left
end

#rightObject

No fewer than this number of letters will show up to the right of the hyphen. This overrides the default specified in the language.



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# File 'lib/text/hyphen.rb', line 92

def right
  @right
end

Instance Method Details

#clear_cache!Object



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# File 'lib/text/hyphen.rb', line 220

def clear_cache!
  @cache.clear
  @vcache.clear
end

#hyphenate(word) ⇒ Object

Returns a list of places where the word can be divided, as

hyp.hyphenate('representation')

returns [3, 5, 8, 10]. If the word has been hyphenated previously, it will be returned from a per-instance cache.



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# File 'lib/text/hyphen.rb', line 160

def hyphenate(word)
  word = word.downcase
  $stderr.puts "Hyphenating #{word}" if DEBUG
  return @cache[word] if @cache.has_key?(word)
  res = @language.exceptions[word]
  return @cache[word] = make_result_list(res) if res

  letters = word.scan(@language.scan_re)
  $stderr.puts letters.inspect if DEBUG
  word_size = letters.size

  result = [0] * (word_size + 1)
  right_stop = word_size - @right

  updater = Proc.new do |hash, str, pos|
    if hash.has_key?(str)
      $stderr.print "#{pos}: #{str}: #{hash[str]}" if DEBUG
      hash[str].scan(@language.scan_re).each_with_index do |cc, ii|
        cc = cc.to_i
        result[ii + pos] = cc if cc > result[ii + pos]
      end
      $stderr.print ": #{result.inspect}\n" if DEBUG
    end
  end

    # Walk the word
  (0..right_stop).each do |pos|
    rest_length = word_size - pos
    (1..rest_length).each do |length|
      substr = letters[pos, length].join('')
      updater[@language.hyphen, substr, pos]
      updater[@language.start, substr, pos] if pos.zero?
      updater[@language.stop, substr, pos] if (length == rest_length)
    end
  end

  updater[@language.both, word, 0] if @language.both[word]

  (0..@left).each { |i| result[i] = 0 }
  ((-1 - @right)..(-1)).each { |i| result[i] = 0 }
  @cache[word] = make_result_list(result)
end

#hyphenate_to(word, size) ⇒ Object

This function will hyphenate a word so that the first point is at most size characters.



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# File 'lib/text/hyphen.rb', line 227

def hyphenate_to(word, size)
  point = hyphenate(word).delete_if { |e| e >= size }.max
  if point.nil?
    [nil, word]
  else
    [word[0 ... point] + "-", word[point .. -1]]
  end
end

#statsObject

Returns statistics



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# File 'lib/text/hyphen.rb', line 237

def stats
  _b = @language.both.size
  _s = @language.start.size
  _e = @language.stop.size
  _h = @language.hyphen.size
  _x = @language.exceptions.size
  _T = _b + _s + _e + _h + _x

  s = <<-EOS

The language '%s' contains %d total hyphenation patterns.
  % 6d patterns are word start patterns.
  % 6d patterns are word stop patterns.
  % 6d patterns are word start/stop patterns.
  % 6d patterns are normal patterns.
  % 6d patterns are exceptions.

EOS
  s % [ @iso_language, _T, _s, _e, _b, _h, _x ]
end

#visualise(word) ⇒ Object Also known as: visualize

Returns a visualization of the hyphenation points, so:

hyp.visualize('representation')

returns rep-re-sen-ta-tion, at least for English patterns. If the word has been visualised previously, it will be returned from a per-instance cache.



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# File 'lib/text/hyphen.rb', line 210

def visualise(word)
  return @vcache[word] if @vcache.has_key?(word)
  w = word.dup
  hyphenate(w).each_with_index do |pos, n|
    w[pos.to_i + n, 0] = '-' if pos != 0
  end
  @vcache[word] = w
end