class Jekyll::Spaceship::MermaidProcessor

Public Class Methods

config() click to toggle source
# File lib/jekyll-spaceship/processors/mermaid-processor.rb, line 10
def self.config
  {
    'mode' => 'default',
    'syntax' => {
      'code' => 'mermaid!',
      'custom' => ['@startmermaid', '@endmermaid']
    },
    'css' => {
      'class' => 'mermaid'
    },
    'config': {
      'theme' => 'default'
    },
    'src' => 'https://mermaid.ink/svg/'
  }
end

Public Instance Methods

get_url(code) click to toggle source
# File lib/jekyll-spaceship/processors/mermaid-processor.rb, line 84
def get_url(code)
  src = self.config['src']

  # wrap code
  code = {
    'code' => code.gsub(/^\s*|\s*$/, ''),
    'mermaid' => config['config']
  }.to_json

  # set default method
  src += '{code}' if src.match(/\{.*\}/).nil?

  # encode to base64 string
  if src.include?('{code}')
    code = Base64.urlsafe_encode64(code, padding: false)
    return src.gsub('{code}', code)
  else
    raise "No supported src ! #{src}"
  end
end
handle_mermaid(code) click to toggle source
# File lib/jekyll-spaceship/processors/mermaid-processor.rb, line 62
def handle_mermaid(code)
  # Handle extra empty lines, otherwise it would cause error
  code = code.gsub(/\n\s*\n/, "\n%%-\n")

  # encode to UTF-8
  code = code.encode('UTF-8')
  url = get_url(code)

  # render mode
  case self.config['mode']
  when 'pre-fetch'
    data = self.class.fetch_img_data(url)
  end
  if data.nil?
    data = { 'type' => 'url', 'body' => url }
  end

  # return img tag
  data['class'] = self.config['css']['class']
  self.class.make_img_tag(data)
end
handle_mermaid_block(pattern, content) click to toggle source
# File lib/jekyll-spaceship/processors/mermaid-processor.rb, line 46
def handle_mermaid_block(pattern, content)
  content.scan pattern do |match|
    match = match.select { |m| not m.nil? }
    block = match[0]
    code = match[2]

    self.handled = true

    content = content.gsub(
      block,
      handle_mermaid(code)
    )
  end
  content
end
on_handle_markdown(content) click to toggle source
# File lib/jekyll-spaceship/processors/mermaid-processor.rb, line 27
def on_handle_markdown(content)
  # match custom mermaid block and code block
  syntax = self.config['syntax']
  code_name = syntax['code']
  custom = syntax['custom'][-2, 2]

  patterns = [
    /((`{3,})\s*#{code_name}((?:.|\n)*?)\2)/,
    /((?<!\\)(#{custom[0]})((?:.|\n)*?)(?<!\\)(#{custom[1]}))/
  ]

  patterns.each do |pattern|
    content = handle_mermaid_block(pattern, content)
  end

  # handle escape custom mermaid block
  content.gsub(/\\(#{custom[0]}|#{custom[1]})/, '\1')
end