adding support to markdown cartridges

1 files changed, 56 insertions, 0 deletions

diff --git a/logic/cartridge/parser.rb b/logic/cartridge/parser.rb
new file mode 100644
index 0000000..440c929
--- /dev/null
+++ b/logic/cartridge/parser.rb
@@ -0,0 +1,56 @@
+# frozen_string_literal: true
+
+require 'singleton'
+
+require 'redcarpet'
+require 'redcarpet/render_strip'
+
+module NanoBot
+  module Logic
+    module Cartridge
+      module Parser
+        def self.parse(raw, format:)
+          normalized = format.to_s.downcase.gsub('.', '')
+
+          if %w[yml yaml].include?(normalized)
+            yaml(raw)
+          elsif %w[markdown mdown mkdn md].include?(normalized)
+            markdown(raw)
+          else
+            raise "Unknown cartridge format: '#{format}'"
+          end
+        end
+
+        def self.markdown(raw)
+          yaml(Markdown.instance.render(raw))
+        end
+
+        def self.yaml(raw)
+          Logic::Helpers::Hash.symbolize_keys(
+            YAML.safe_load(raw, permitted_classes: [Symbol])
+          )
+        end
+
+        class Renderer < Redcarpet::Render::Base
+          def block_code(code, _language)
+            "\n#{code}\n"
+          end
+        end
+
+        class Markdown
+          include Singleton
+
+          attr_reader :markdown
+
+          def initialize
+            @markdown = Redcarpet::Markdown.new(Renderer, fenced_code_blocks: true)
+          end
+
+          def render(raw)
+            @markdown.render(raw)
+          end
+        end
+      end
+    end
+  end
+end