Method: Diff::LCS.diff

Defined in:
lib/gems/diff-lcs-1.1.2/lib/diff/lcs.rb

.diff(seq1, seq2, callbacks = nil, &block) ⇒ Object

Diff::LCS.diff computes the smallest set of additions and deletions necessary to turn the first sequence into the second, and returns a description of these changes.

See Diff::LCS::DiffCallbacks for the default behaviour. An alternate behaviour may be implemented with Diff::LCS::ContextDiffCallbacks. If a Class argument is provided for callbacks, #diff will attempt to initialise it. If the callbacks object (possibly initialised) responds to #finish, it will be called.



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# File 'lib/gems/diff-lcs-1.1.2/lib/diff/lcs.rb', line 254

def diff(seq1, seq2, callbacks = nil, &block) # :yields diff changes:
  callbacks ||= Diff::LCS::DiffCallbacks
  if callbacks.kind_of?(Class)
    cb = callbacks.new rescue callbacks
    callbacks = cb
  end
  traverse_sequences(seq1, seq2, callbacks)
  callbacks.finish if callbacks.respond_to?(:finish)

  if block_given?
    res = callbacks.diffs.map do |hunk|
      if hunk.kind_of?(Array)
        hunk = hunk.map { |block| yield block }
      else
        yield hunk
      end
    end
    res
  else
    callbacks.diffs
  end
end