lib/jekyll-spaceship/processors/plantuml-processor.rb
# frozen_string_literal: true
require "net/http"
require "base64"
module Jekyll::Spaceship
class PlantumlProcessor < Processor
exclude :none
def self.config
{
'mode' => 'default',
'syntax' => {
'code' => 'plantuml!',
'custom' => ['@startuml', '@enduml']
},
'css' => {
'class' => 'plantuml'
},
'src' => 'http://www.plantuml.com/plantuml/svg/'
}
end
def on_handle_markdown(content)
# match custom plantuml 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_plantuml_block(pattern, content)
end
# handle escape custom plantuml block
content.gsub(/\\(#{custom[0]}|#{custom[1]})/, '\1')
end
def handle_plantuml_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_plantuml(code)
)
end
content
end
def handle_plantuml(code)
# wrap plantuml code
code = "@startuml#{code}@enduml".encode('UTF-8')
url = self.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
def get_url(code)
src = self.config['src']
# set default method
src += '{hexcode}' if src.match(/\{.*\}/).nil?
# encode to hex string
if src.include?('{hexcode}')
code = '~h' + code.unpack("H*").first
return src.gsub('{hexcode}', code)
else
raise "No supported src ! #{src}"
end
end
end
end