Contents

# -*- encoding : utf-8 -*-

class Card
  class Diff
    class << self
      def complete a, b, opts={}
        Card::Diff.new(a, b, opts).complete
      end

      def summary a, b, opts={}
        Card::Diff.new(a, b, opts).summary
      end

      def render_added_chunk text
        "<ins class='diffins diff-green'>#{text}</ins>"
      end

      def render_deleted_chunk text, _count=true
        "<del class='diffdel diff-red'>#{text}</del>"
      end
    end

    attr_reader :result
    delegate :summary, :complete, to: :result

    # diff options
    # :format  => :html|:text|:pointer|:raw
    #   :html    = maintain html structure, but compare only content
    #   :text    = remove all html tags; compare plain text
    #   :pointer = remove all double square brackets
    #   :raw     = escape html tags and compare everything
    #
    # summary: {length: <number> , joint: <string> }

    def initialize old_version, new_version, opts={}
      @result = Result.new opts[:summary]
      if new_version
        lcs_opts = lcs_opts_for_format opts[:format]
        LCS.new(lcs_opts).run(old_version, new_version, @result)
      end
    end

    def red?
      @result.dels_cnt > 0
    end

    def green?
      @result.adds_cnt > 0
    end

    private

    def lcs_opts_for_format format
      opts = {}
      case format
      when :html
        opts[:exclude] = /^</
      when :text
        opts[:reject] =  /^</
        opts[:postprocess] = proc { |word| word.gsub("\n", '<br>') }
      when :pointer
        opts[:preprocess] = proc { |word| word.gsub('[[', '').gsub(']]', '') }
      else # :raw
        opts[:preprocess] = proc { |word| CGI.escapeHTML(word) }
      end
      opts
    end
  end
end

Version data entries

6 entries across 6 versions & 1 rubygems

Version	Path
card-1.18.6	lib/card/diff.rb
card-1.18.5	lib/card/diff.rb
card-1.18.4	lib/card/diff.rb
card-1.18.3	lib/card/diff.rb
card-1.18.2	lib/card/diff.rb
card-1.18.1	lib/card/diff.rb