Parent

Included Modules

Diff::LCS::ContextChange

Represents a contextual change. Contains the position and values of the elements in the old and the new sequenced enumerables as well as the action taken.

Attributes

action[R]

Returns the action this Change represents. Can be '+' (adding?), '-' (deleting?), '=' (unchanged?), # or '!' (changed?). When created by Diff::LCS#diff or Diff::LCS#sdiff, it may also be '>' (finished_a?) or '<' (finished_b?).

new_element[R]
new_position[R]
old_element[R]
old_position[R]

Public Class Methods

from_a(arr) click to toggle source

Creates a ContextChange from an array produced by ContextChange#to_a.

# File lib/diff/lcs/change.rb, line 138
def self.from_a(arr)
  if arr.size == 5
    Diff::LCS::ContextChange.new(arr[0], arr[1], arr[2], arr[3], arr[4])
  else
    Diff::LCS::ContextChange.new(arr[0], arr[1][0], arr[1][1], arr[2][0],
                                 arr[2][1])
  end
end
new(action, old_position, old_element, new_position, new_element) click to toggle source
# File lib/diff/lcs/change.rb, line 125
def initialize(action, old_position, old_element, new_position, new_element)
  @action = action
  @old_position = old_position
  @old_element = old_element
  @new_position = new_position
  @new_element = new_element
end
simplify(event) click to toggle source

Simplifies a context change for use in some diff callbacks. '<' actions are converted to '-' and '>' actions are converted to '+'.

# File lib/diff/lcs/change.rb, line 149
def self.simplify(event)
  ea = event.to_a

  case ea[0]
  when '-'
    ea[2][1] = nil
  when '<'
    ea[0] = '-'
    ea[2][1] = nil
  when '+'
    ea[1][1] = nil
  when '>'
    ea[0] = '+'
    ea[1][1] = nil
  end

  Diff::LCS::ContextChange.from_a(ea)
end

Public Instance Methods

<=>(other) click to toggle source
# File lib/diff/lcs/change.rb, line 116
def <=>(other)
  r = @action <=> other.action
  r = @old_position <=> other.old_position if r.zero?
  r = @new_position <=> other.new_position if r.zero?
  r = @old_element <=> other.old_element if r.zero?
  r = @new_element <=> other.new_element if r.zero?
  r
end
==(other) click to toggle source
# File lib/diff/lcs/change.rb, line 104
def ==(other)
  (@action == other.action) and
  (@old_position == other.old_position) and
  (@new_position == other.new_position) and
  (@old_element == other.old_element) and
  (@new_element == other.new_element)
end
inspect(*args) click to toggle source
# File lib/diff/lcs/change.rb, line 112
def inspect(*args)
  %(#<#{self.class.name}:#{__id__} @action=#{action} positions=#{old_position},#{new_position} elements=#{old_element.inspect},#{new_element.inspect}>)
end
to_a() click to toggle source
# File lib/diff/lcs/change.rb, line 133
def to_a
  [@action, [@old_position, @old_element], [@new_position, @new_element]]
end

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