class LCS::HTMLDiff

Produce a simple HTML diff view.

Constants

DEFAULT_CSS: standard:disable Layout/HeredocIndentation
DEFAULT_OPTIONS: standard:disable Style/HashSyntax

Attributes

options[R]

Public Class Methods

new(left, right, options = nil) click to toggle source

# File lib/diff/lcs/htmldiff.rb, line 94
def initialize(left, right, options = nil)
  @left = left
  @right = right
  @options = options

  @options = DEFAULT_OPTIONS.dup if @options.nil?
end

Public Instance Methods

run() click to toggle source

# File lib/diff/lcs/htmldiff.rb, line 116
  def run
    verify_options

    if @options[:expand_tabs].positive? && self.class.can_expand_tabs
      formatter = Text::Format.new
      formatter.tabstop = @options[:expand_tabs]

      @left.map! { |line| formatter.expand(line.chomp) }
      @right.map! { |line| formatter.expand(line.chomp) }
    end

    @left.map! { |line| CGI.escapeHTML(line.chomp) }
    @right.map! { |line| CGI.escapeHTML(line.chomp) }

    # standard:disable Layout/HeredocIndentation
    @options[:output] << <<-OUTPUT
<html>
  <head>
    <title>#{@options[:title]}</title>
    <style type="text/css">
    #{@options[:css]}
    </style>
  </head>
  <body>
    <h1>#{@options[:title]}</h1>
    <p>Legend: <span class="only_a">Only in Old</span>&nbsp;
    <span class="only_b">Only in New</span></p>
    <div class="diff">
    OUTPUT
    # standard:enable Layout/HeredocIndentation

    callbacks = Callbacks.new(@options[:output])
    Diff::LCS.traverse_sequences(@left, @right, callbacks)

    # standard:disable Layout/HeredocIndentation
    @options[:output] << <<-OUTPUT
    </div>
  </body>
</html>
    OUTPUT
    # standard:enable Layout/HeredocIndentation
  end