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ðŸ“„ locale.rb(2.35 KB)
ðŸ“„ text.rb(2.88 KB)

Editing: text.rb

# frozen_string_literal: true
##
# An i18n supported text.
#
# This object provides the following two features:
#
#   * Extracts translation messages from wrapped raw text.
#   * Translates wrapped raw text in specified locale.
#
# Wrapped raw text is one of String, RDoc::Comment or Array of them.

class RDoc::I18n::Text

##
  # Creates a new i18n supported text for +raw+ text.

def initialize(raw)
    @raw = raw
  end

##
  # Extracts translation target messages and yields each message.
  #
  # Each yielded message is a Hash. It consists of the followings:
  #
  # :type      :: :paragraph
  # :paragraph :: String (The translation target message itself.)
  # :line_no   :: Integer (The line number of the :paragraph is started.)
  #
  # The above content may be added in the future.

def extract_messages
    parse do |part|
      case part[:type]
      when :empty_line
        # ignore
      when :paragraph
        yield(part)
      end
    end
  end

# Translates raw text into +locale+.
  def translate(locale)
    translated_text = ''
    parse do |part|
      case part[:type]
      when :paragraph
        translated_text += locale.translate(part[:paragraph])
      when :empty_line
        translated_text += part[:line]
      else
        raise "should not reach here: unexpected type: #{type}"
      end
    end
    translated_text
  end

private
  def parse(&block)
    paragraph = ''
    paragraph_start_line = 0
    line_no = 0

each_line(@raw) do |line|
      line_no += 1
      case line
      when /\A\s*\z/
        if paragraph.empty?
          emit_empty_line_event(line, line_no, &block)
        else
          paragraph += line
          emit_paragraph_event(paragraph, paragraph_start_line, line_no,
                               &block)
          paragraph = ''
        end
      else
        paragraph_start_line = line_no if paragraph.empty?
        paragraph += line
      end
    end

unless paragraph.empty?
      emit_paragraph_event(paragraph, paragraph_start_line, line_no, &block)
    end
  end

def each_line(raw, &block)
    case raw
    when RDoc::Comment
      raw.text.each_line(&block)
    when Array
      raw.each do |comment, location|
        each_line(comment, &block)
      end
    else
      raw.each_line(&block)
    end
  end

def emit_empty_line_event(line, line_no)
    part = {
      :type => :empty_line,
      :line => line,
      :line_no => line_no,
    }
    yield(part)
  end

def emit_paragraph_event(paragraph, paragraph_start_line, line_no, &block)
    paragraph_part = {
      :type => :paragraph,
      :line_no => paragraph_start_line,
    }
    match_data = /(\s*)\z/.match(paragraph)
    if match_data
      paragraph_part[:paragraph] = match_data.pre_match
      yield(paragraph_part)
      emit_empty_line_event(match_data[1], line_no, &block)
    else
      paragraph_part[:paragraph] = paragraph
      yield(paragraph_part)
    end
  end

end

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