prawnpdf/prawn

# frozen_string_literal: true

require 'prawn/manual_builder'

Prawn::ManualBuilder::Chapter.new do
  title 'Right-to-Left Text'

  text do
    prose <<~TEXT
      Prawn can be used with right-to-left text. The direction can be set
      document-wide, on particular text, or on a text-box. Setting the
      direction to <code>:rtl</code> automatically changes the default
      alignment to <code>:right</code>.

      You can even override direction on an individual fragment. The one caveat
      is that two fragments going against the main direction cannot be placed
      next to each other without appearing in the wrong order.

      Writing bidirectional text that combines both left-to-right and
      right-to-left languages is easy using the <code>bidi</code> Ruby Gem and
      its <code>render_visual</code> function. See
      https://github.com/elad/ruby-bidi for instructions and an example using Prawn.
    TEXT
  end

  example new_page: true do
    # set the direction document-wide
    self.text_direction = :rtl

    font("#{Prawn::ManualBuilder::DATADIR}/fonts/Jigmo.ttf", size: 16) do
      long_text = '写个小爬虫把你的页面上的关键信息顺次爬下来也不是什么难事写个小爬虫把你的页面上的' \
        '关键信息顺次爬下来也不是什么难事写个小爬虫把你的页面上的关键信息顺次爬下来也不是什么难事写' \
        '个小'
      text long_text
      move_down 20

      text 'You can override the document direction.', direction: :ltr
      move_down 20

      formatted_text [
        { text: '更可怕的是，同质化竞争对手可以按照' },
        { text: 'URL', direction: :ltr },
        { text: '中后面这个' },
        { text: 'ID', direction: :ltr },
        { text: '来遍历您的' },
        { text: 'DB', direction: :ltr },
        {
          text: '中的内容、写个小爬虫把你的页面上的关键信息顺次爬下来也不是什么难事、这样的话、' \
            '你就非常被动了。',
        },
      ]
      move_down 20

      formatted_text [
        { text: '更可怕的是、同质化竞争对手可以按照' },
        { text: 'this', direction: :ltr },
        { text: "won't", direction: :ltr, size: 24 },
        { text: 'work', direction: :ltr },
        { text: '中的内容、写个小爬虫把你的页面上的关键信息顺次爬下来也不是什么难事' },
      ]
    end
  end
end