Class: Jekyll::Spaceship::EmojiProcessor

Inherits:
Processor
  • Object
show all
Defined in:
lib/jekyll-spaceship/processors/emoji-processor.rb

Constant Summary

Constants inherited from Processor

Processor::DEFAULT_PRIORITY, Processor::PRIORITY_MAP

Instance Attribute Summary

Attributes inherited from Processor

#config, #exclusions, #handled, #logger, #page, #priority, #registers

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Processor

class_name, #converter, #dispatch, escape_html, exclude, #exclusion_regexs, #ext, fetch_img_data, #filename, #get_exclusion, handle_bang_link, #initialize, #initialize_exclusions, #initialize_priority, #initialize_register, make_img_tag, #name, #next?, #on_handle_html_block, #on_handled, #output_ext, #post_exclude, #pre_exclude, priority, #process?, register

Constructor Details

This class inherits a constructor from Jekyll::Spaceship::Processor

Class Method Details

.config ⇒ Object 



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# File 'lib/jekyll-spaceship/processors/emoji-processor.rb', line 9

def self.config
  {
    'css' => {
      'class' => 'emoji'
    },
    'src' => 'https://github.githubassets.com/images/icons/emoji/'
  }
end

Instance Method Details

#emoji_filter(content, selector) ⇒ Object 



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# File 'lib/jekyll-spaceship/processors/emoji-processor.rb', line 37

def emoji_filter(content, selector)
  # use nokogiri to parse html
  doc = Nokogiri::HTML(content)

  body = doc.at('body')

  # in case of a page has no the body node, especially when your
  # page's layout field of front matter is nil or unavailable
  return content if body.nil?

  # Count for restoration
  escaped_count = 0

  # filter nodes (pre, code)
  body.css(selector).each do |node|
    count = escaped_count

    # handle emoji markup
    inner_html = node.inner_html.gsub(
      /(?<!\\):([\w\d+-]+?)(?<!\\):/
    ) do |match|
      escaped_count += 1
      "\\:#{match[1..-2]}\\:"
    end

    if escaped_count > count
      node.inner_html = inner_html
    end
  end

  # parse the emoji
  content = body.inner_html
  content.scan(/(?<!\\):([\w\d+-]+?)(?<!\\):/) do |match|
    # Skip invalid emoji name
    emoji = Emoji.find_by_alias match[0]
    next if emoji.nil?

    # escape plus sign
    emoji_name = emoji.name.gsub('+', '\\\+')

    result = yield emoji
    next if result.nil?

    content = content.gsub(
      /(?<!\=")\s*:#{emoji_name}:\s*(?!"\s)/,
      result)
  end

  body.inner_html = content

  return doc.to_html if escaped_count.zero?

  # restore nodes (pre, code)
  body.css(selector).each do |node|
    # handle emoji markup
    node.inner_html = node.inner_html.gsub(
      /\\:([\w\d+-]+?)\\:/, ':\1:'
    )
  end

  doc.to_html
end

#on_handle_html(content) ⇒ Object 



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# File 'lib/jekyll-spaceship/processors/emoji-processor.rb', line 18

def on_handle_html(content)
  emoji_filter(content, 'pre code') do |emoji|
    # mark current file has been handled
    self.handled = true

    # here is the replacement content
    "<img class=\"#{config['css']['class']}\""\
      " title=\":#{emoji.name}:\""\
      " alt=\":#{emoji.name}:\""\
      " raw=\"#{emoji.raw}\""\
      " src=\"#{config['src']}#{emoji.image_filename}\""\
      " style=\"vertical-align: middle; display: inline;"\
      " max-width: 1em; visibility: hidden;\""\
      " onload=\"this.style.visibility='visible'\""\
      " onerror=\"this.replaceWith(this.getAttribute('raw'))\">"\
      "</img>"
  end
end