# frozen_string_literal: true module Gitlab module QuickActions # This class takes an array of commands that should be extracted from a # given text. # # ``` # extractor = Gitlab::QuickActions::Extractor.new([:open, :assign, :labels]) # ``` class Extractor attr_reader :command_definitions def initialize(command_definitions) @command_definitions = command_definitions end # Extracts commands from content and return an array of commands. # The array looks like the following: # [ # ['command1'], # ['command3', 'arg1 arg2'], # ] # The command and the arguments are stripped. # The original command text is removed from the given `content`. # # Usage: # ``` # extractor = Gitlab::QuickActions::Extractor.new([:open, :assign, :labels]) # msg = %(hello\n/labels ~foo ~"bar baz"\nworld) # commands = extractor.extract_commands(msg) #=> [['labels', '~foo ~"bar baz"']] # msg #=> "hello\nworld" # ``` def extract_commands(content, only: nil) return [content, []] unless content content = content.dup commands = [] content.delete!("\r") content.gsub!(commands_regex(only: only)) do if $~[:cmd] commands << [$~[:cmd].downcase, $~[:arg]].reject(&:blank?) '' else $~[0] end end content, commands = perform_substitutions(content, commands) [content.strip, commands] end private # Builds a regular expression to match known commands. # First match group captures the command name and # second match group captures its arguments. # # It looks something like: # # /^\/(?close|reopen|...)(?:( |$))(?[^\/\n]*)(?:\n|$)/ def commands_regex(only:) names = command_names(limit_to_commands: only).map(&:to_s) @commands_regex ||= %r{ (?


              # Code blocks:
              # ```
              # Anything, including `/cmd arg` which are ignored by this filter
              # ```

              ^```
              .+?
              \n```$
            )
          |
            (?
              # HTML block:
              # 
              # Anything, including `/cmd arg` which are ignored by this filter
              # 

              ^<[^>]+?>\n
              .+?
              \n<\/[^>]+?>$
            )
          |
            (?
              # Quote block:
              # >>>
              # Anything, including `/cmd arg` which are ignored by this filter
              # >>>

              ^>>>
              .+?
              \n>>>$
            )
          |
            (?:
              # Command not in a blockquote, blockcode, or HTML tag:
              # /close

              ^\/
              (?#{Regexp.new(Regexp.union(names).source, Regexp::IGNORECASE)})
              (?:
                [ ]
                (?[^\n]*)
              )?
              (?:\n|$)
            )
        }mix
      end

      def perform_substitutions(content, commands)
        return unless content

        substitution_definitions = self.command_definitions.select do |definition|
          definition.is_a?(Gitlab::QuickActions::SubstitutionDefinition)
        end

        substitution_definitions.each do |substitution|
          match_data = substitution.match(content.downcase)
          if match_data
            command = [substitution.name.to_s]
            command << match_data[1] unless match_data[1].empty?
            commands << command
          end

          content = substitution.perform_substitution(self, content)
        end

        [content, commands]
      end

      def command_names(limit_to_commands:)
        command_definitions.flat_map do |command|
          next if command.noop?

          if limit_to_commands && (command.all_names & limit_to_commands).empty?
            next
          end

          command.all_names
        end.compact
      end
    end
  end
end