Class: Yosina::Transliterators::ProlongedSoundMarks::Transliterator

Inherits:
BaseTransliterator show all
Includes:
CharType
Defined in:
lib/yosina/transliterators/prolonged_sound_marks.rb

Overview

Transliterator for prolonged sound marks

Constant Summary

Constants included from CharType

CharType::HYPHEN_LIKE_CHARS

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from CharType

#alphanumeric?, #fullwidth?, #fullwidth_alphanumeric?, #halfwidth?, #halfwidth_alphanumeric?, #hatsuon?, #hiragana?, #hyphen_like?, #katakana?, #prolongable?, #prolonged_sound_mark?, #sokuon?

Constructor Details

#initialize(options = {}) ⇒ Transliterator

Initialize the transliterator with options

Parameters:

  • options (Hash) (defaults to: {}) —

    Configuration options

Options Hash (options):

  • :skip_already_transliterated_chars (Boolean) —

    Skip chars that were already processed. Default: false.

  • :allow_prolonged_hatsuon (Boolean) —

    Allow prolonging ん/ン/ﾝ. Default: false.

  • :allow_prolonged_sokuon (Boolean) —

    Allow prolonging っ/ッ/ｯ. Default: false.

  • :replace_prolonged_marks_following_alnums (Boolean) —

    Replace prolonged marks after alphanum with hyphens. Default: false.



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# File 'lib/yosina/transliterators/prolonged_sound_marks.rb', line 99

def initialize(options = {})
  super()
  @skip_already_transliterated_chars = options.fetch(:skip_already_transliterated_chars, false)
  @allow_prolonged_hatsuon = options.fetch(:allow_prolonged_hatsuon, false)
  @allow_prolonged_sokuon = options.fetch(:allow_prolonged_sokuon, false)
  @replace_prolonged_marks_following_alnums = options.fetch(:replace_prolonged_marks_following_alnums, false)
end

Instance Attribute Details

#allow_prolonged_hatsuon ⇒ Object (readonly)

Returns the value of attribute allow_prolonged_hatsuon.



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# File 'lib/yosina/transliterators/prolonged_sound_marks.rb', line 85

def allow_prolonged_hatsuon
  @allow_prolonged_hatsuon
end

#allow_prolonged_sokuon ⇒ Object (readonly)

Returns the value of attribute allow_prolonged_sokuon.



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# File 'lib/yosina/transliterators/prolonged_sound_marks.rb', line 85

def allow_prolonged_sokuon
  @allow_prolonged_sokuon
end

#replace_prolonged_marks_following_alnums ⇒ Object (readonly)

Returns the value of attribute replace_prolonged_marks_following_alnums.



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# File 'lib/yosina/transliterators/prolonged_sound_marks.rb', line 85

def replace_prolonged_marks_following_alnums
  @replace_prolonged_marks_following_alnums
end

#skip_already_transliterated_chars ⇒ Object (readonly)

Returns the value of attribute skip_already_transliterated_chars.



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# File 'lib/yosina/transliterators/prolonged_sound_marks.rb', line 85

def skip_already_transliterated_chars
  @skip_already_transliterated_chars
end

Instance Method Details

#call(input_chars) ⇒ Enumerable<Char>

Convert hyphen-like characters to appropriate prolonged sound marks

Parameters:

  • input_chars (Enumerable<Char>) —

    The characters to transliterate

Returns:

  • (Enumerable<Char>) —

    The transliterated characters



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# File 'lib/yosina/transliterators/prolonged_sound_marks.rb', line 111

def call(input_chars)
  offset = 0
  processed_char_in_lookahead = false
  lookahead_buf = []
  last_non_prolonged_char = nil

  Chars.enum do |y|
    input_chars.each do |char|
      unless lookahead_buf.empty?
        if !char.c.empty? && hyphen_like?(char.c.ord)
          processed_char_in_lookahead = true unless char.source.nil?
          lookahead_buf << char
          next
        end
        prev_non_prolonged_char = last_non_prolonged_char
        last_non_prolonged_char = char

        if (prev_non_prolonged_char.nil? || alphanumeric?(prev_non_prolonged_char.c.ord)) && (
          !@skip_already_transliterated_chars || !processed_char_in_lookahead
        )
          halfwidth = halfwidth?(
            prev_non_prolonged_char.nil? ? last_non_prolonged_char.c.ord : prev_non_prolonged_char.c.ord
          )
          replacement = halfwidth ? "\u002d" : "\uff0d"
          lookahead_buf.each do |buffered_char|
            y << Char.new(c: replacement, offset: offset, source: buffered_char)
            offset += replacement.length
          end
        else
          lookahead_buf.each do |buffered_char|
            y << buffered_char.with_offset(offset)
            offset += buffered_char.c.length
          end
        end

        lookahead_buf.clear
        y << char.with_offset(offset)
        offset += char.c.length
        last_non_prolonged_char = char
        processed_char_in_lookahead = false
        next
      end
      if !char.c.empty? && hyphen_like?(char.c.ord)
        should_procses = !@skip_already_transliterated_chars || !char.transliterated?
        if should_procses && !last_non_prolonged_char.nil?
          if prolongable_char?(last_non_prolonged_char.c.ord)
            replacement = halfwidth?(last_non_prolonged_char.c.ord) ? "\uff70" : "\u30fc"
            y << Char.new(c: replacement, offset: offset, source: char)
            offset += replacement.length
            next
          elsif @replace_prolonged_marks_following_alnums && alphanumeric?(last_non_prolonged_char.c.ord)
            lookahead_buf << char
            next
          end
        end
      else
        last_non_prolonged_char = char
      end
      y << char.with_offset(offset)
      offset += char.c.length
    end
  end
end