class CjkBreaksTreeprocessor

# File lib/asciidoctor/cjk_breaks_treeprocessor.rb, line 88
def hangul?(char)
  # require('unicode-10.0.0/Script/Hangul/regex')
  char.match?(REGEXP_HANGUL_CHARS)
end

# File lib/asciidoctor/cjk_breaks_treeprocessor.rb, line 5
def process(document)
  process_interal document
  nil
end

# File lib/asciidoctor/cjk_breaks_treeprocessor.rb, line 10
def process_interal(block)
  case block.context
  when :paragraph
    remove_cjk_breaks block
  when :dlist
    block
  when :table
    block
  else
    block.blocks.map! do |b|
      process_interal b
    end
    block
  end
end

# File lib/asciidoctor/cjk_breaks_treeprocessor.rb, line 26
def remove_cjk_breaks(block)
  content_changed = false
  # Processing after raw_source -> block.lines -> block.content in asciidoctor.
  # It may be better to make this process while the process from raw_source -> block.lines
  # whose code flow is:
  # -> `Asciidoctor::Block.initialize`
  # -> `Asciidoctor::Helpers.normalize_lines_from_string`.
  lines = block.content.lines
  lines.each_with_index do |line, line_index|
    last_char_idx = line.rindex(/[^\r|\n]/)
    last_char = line[last_char_idx]
    next_line = lines[line_index + 1]
    next_char = next_line[0] if next_line

    next unless last_char && next_char

    remove_break = false

    if last_char == "\u200b" || next_char == "\u200b"
      # remove newline if it's adjacent to ZWSP
      remove_break = true
    elsif EastAsianWidth.east_asian_width(last_char).match?(/^[FWH]$/) &&
          EastAsianWidth.east_asian_width(next_char).match?(/^[FWH]$/)
      # remove newline if both characters are fullwidth (F), wide (W) or
      # halfwidth (H), but not Hangul
      remove_break = true if !hangul?(last_char) && !hangul?(next_char)
    end

    if remove_break
      lines[line_index] = line.chomp
      content_changed = true
    end
  end

  if content_changed
    create_paragraph block.document, lines.join(''), block.attributes
  else
    block
  end
end